diff --git a/cmd/gor/gor.go b/cmd/gor/gor.go
index e1a30a65..61292a7c 100644
--- a/cmd/gor/gor.go
+++ b/cmd/gor/gor.go
@@ -6,8 +6,6 @@ import (
 	"expvar"
 	"flag"
 	"fmt"
-	"github.com/buger/goreplay"
-	"log"
 	"net/http"
 	"net/http/httputil"
 	httppptof "net/http/pprof"
@@ -15,10 +13,109 @@ import (
 	"os/signal"
 	"runtime"
 	"runtime/pprof"
+	"strings"
 	"syscall"
 	"time"
+
+	"github.com/buger/goreplay/pkg/binary"
+	"github.com/buger/goreplay/pkg/dummy"
+	"github.com/buger/goreplay/pkg/emitter"
+	"github.com/buger/goreplay/pkg/file"
+	gor_http "github.com/buger/goreplay/pkg/http"
+	"github.com/buger/goreplay/pkg/kafka"
+	"github.com/buger/goreplay/pkg/null"
+	"github.com/buger/goreplay/pkg/plugin"
+	"github.com/buger/goreplay/pkg/raw"
+	"github.com/buger/goreplay/pkg/settings"
+	"github.com/buger/goreplay/pkg/tcp"
+	"github.com/buger/goreplay/pkg/ws"
+
+	"github.com/rs/zerolog/log"
 )
 
+// Settings used for quick access to CLI flags
+var Settings = settings.Settings
+
+// NewPlugins specify and initialize all available plugins
+func NewPlugins() *plugin.InOutPlugins {
+	plugins := new(plugin.InOutPlugins)
+
+	for _, options := range Settings.InputDummy {
+		plugins.RegisterPlugin(dummy.NewDummyInput, options)
+	}
+
+	for range Settings.OutputDummy {
+		plugins.RegisterPlugin(dummy.NewDummyOutput)
+	}
+
+	if Settings.OutputStdout {
+		plugins.RegisterPlugin(dummy.NewDummyOutput)
+	}
+
+	if Settings.OutputNull {
+		plugins.RegisterPlugin(null.NewNullOutput)
+	}
+
+	for _, options := range Settings.InputRAW {
+		plugins.RegisterPlugin(raw.NewRAWInput, options, Settings.InputRAWConfig)
+	}
+
+	for _, options := range Settings.InputTCP {
+		plugins.RegisterPlugin(tcp.NewTCPInput, options, &Settings.InputTCPConfig)
+	}
+
+	for _, options := range Settings.OutputTCP {
+		plugins.RegisterPlugin(tcp.NewTCPOutput, options, &Settings.OutputTCPConfig)
+	}
+
+	for _, options := range Settings.OutputWebSocket {
+		plugins.RegisterPlugin(ws.NewWebSocketOutput, options, &Settings.OutputWebSocketConfig)
+	}
+
+	for _, options := range Settings.InputFile {
+		plugins.RegisterPlugin(file.NewFileInput, options, Settings.InputFileLoop, Settings.InputFileReadDepth, Settings.InputFileMaxWait, Settings.InputFileDryRun)
+	}
+
+	for _, path := range Settings.OutputFile {
+		if strings.HasPrefix(path, "s3://") {
+			plugins.RegisterPlugin(file.NewS3Output, path, &Settings.OutputFileConfig)
+		} else {
+			plugins.RegisterPlugin(file.NewFileOutput, path, &Settings.OutputFileConfig)
+		}
+	}
+
+	for _, options := range Settings.InputHTTP {
+		plugins.RegisterPlugin(gor_http.NewHTTPInput, options)
+	}
+
+	// If we explicitly set Host header http output should not rewrite it
+	// Fix: https://github.com/buger/gor/issues/174
+	for _, header := range Settings.ModifierConfig.Headers {
+		if header.Name == "Host" {
+			Settings.OutputHTTPConfig.OriginalHost = true
+			break
+		}
+	}
+
+	for _, options := range Settings.OutputHTTP {
+		plugins.RegisterPlugin(gor_http.NewHTTPOutput, options, &Settings.OutputHTTPConfig)
+	}
+
+	for _, options := range Settings.OutputBinary {
+		plugins.RegisterPlugin(binary.NewBinaryOutput, options, &Settings.OutputBinaryConfig)
+	}
+
+	if Settings.OutputKafkaConfig.Host != "" && Settings.OutputKafkaConfig.Topic != "" {
+		plugins.RegisterPlugin(kafka.NewKafkaOutput, "", &Settings.OutputKafkaConfig, &Settings.KafkaTLSConfig)
+	}
+
+	if Settings.InputKafkaConfig.Host != "" && Settings.InputKafkaConfig.Topic != "" {
+		plugins.RegisterPlugin(kafka.NewKafkaInput, "", &Settings.InputKafkaConfig, &Settings.KafkaTLSConfig)
+	}
+
+	return plugins
+}
+
 var (
 	cpuprofile = flag.String("cpuprofile", "", "write cpu profile to file")
 	memprofile = flag.String("memprofile", "", "write memory profile to this file")
@@ -57,11 +154,14 @@ func loggingMiddleware(addr string, next http.Handler) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		if r.URL.Path == "/loop" {
 			_, err := http.Get("http://" + addr)
-			log.Println(err)
+
+			if err != nil {
+				log.Error().Err(err).Msg("Error while calling loop endpoint")
+			}
 		}
 
 		rb, _ := httputil.DumpRequest(r, false)
-		log.Println(string(rb))
+		log.Info().Msg(string(rb))
 		next.ServeHTTP(w, r)
 	})
 }
@@ -72,26 +172,28 @@ func main() {
 	}
 
 	args := os.Args[1:]
-	var plugins *goreplay.InOutPlugins
+	var plugins *plugin.InOutPlugins
 	if len(args) > 0 && args[0] == "file-server" {
 		if len(args) != 2 {
-			log.Fatal("You should specify port and IP (optional) for the file server. Example: `gor file-server :80`")
+			log.Fatal().Msg("You should specify port and IP (optional) for the file server. Example: `gor file-server :80`")
 		}
 		dir, _ := os.Getwd()
 
-		goreplay.Debug(0, "Started example file server for current directory on address ", args[1])
+		log.Info().Msgf("Started example file server for current directory on address %s", args[1])
 
-		log.Fatal(http.ListenAndServe(args[1], loggingMiddleware(args[1], http.FileServer(http.Dir(dir)))))
+		if err := http.ListenAndServe(args[1], loggingMiddleware(args[1], http.FileServer(http.Dir(dir)))); err != nil {
+			log.Fatal().Err(err).Msg("Failed to start file server")
+		}
 	} else {
 		flag.Parse()
-		goreplay.CheckSettings()
-		plugins = goreplay.NewPlugins()
+		settings.CheckSettings()
+		plugins = NewPlugins()
 	}
 
-	log.Printf("[PPID %d and PID %d] Version:%s\n", os.Getppid(), os.Getpid(), goreplay.VERSION)
+	log.Printf("[PPID %d and PID %d] Version:%s\n", os.Getppid(), os.Getpid(), settings.VERSION)
 
 	if len(plugins.Inputs) == 0 || len(plugins.Outputs) == 0 {
-		log.Fatal("Required at least 1 input and 1 output")
+		log.Fatal().Msg("Required at least 1 input and 1 output")
 	}
 
 	if *memprofile != "" {
@@ -102,20 +204,22 @@ func main() {
 		profileCPU(*cpuprofile)
 	}
 
-	if goreplay.Settings.Pprof != "" {
+	if settings.Settings.Pprof != "" {
 		go func() {
-			log.Println(http.ListenAndServe(goreplay.Settings.Pprof, nil))
+			if err := http.ListenAndServe(settings.Settings.Pprof, nil); err != nil {
+				log.Fatal().Err(err).Msg("Failed to start pprof server")
+			}
 		}()
 	}
 
 	closeCh := make(chan int)
-	emitter := goreplay.NewEmitter()
-	go emitter.Start(plugins, goreplay.Settings.Middleware)
-	if goreplay.Settings.ExitAfter > 0 {
-		log.Printf("Running gor for a duration of %s\n", goreplay.Settings.ExitAfter)
+	emitter := emitter.New(&settings.Settings.EmitterConfig)
+	go emitter.Start(plugins)
+	if settings.Settings.ExitAfter > 0 {
+		log.Printf("Running gor for a duration of %s\n", settings.Settings.ExitAfter)
 
-		time.AfterFunc(goreplay.Settings.ExitAfter, func() {
-			log.Printf("gor run timeout %s\n", goreplay.Settings.ExitAfter)
+		time.AfterFunc(settings.Settings.ExitAfter, func() {
+			log.Printf("gor run timeout %s\n", settings.Settings.ExitAfter)
 			close(closeCh)
 		})
 	}
@@ -136,7 +240,7 @@ func profileCPU(cpuprofile string) {
 	if cpuprofile != "" {
 		f, err := os.Create(cpuprofile)
 		if err != nil {
-			log.Fatal(err)
+			log.Fatal().Err(err).Msg("Failed to create cpu profile file")
 		}
 		pprof.StartCPUProfile(f)
 
@@ -151,7 +255,7 @@ func profileMEM(memprofile string) {
 	if memprofile != "" {
 		f, err := os.Create(memprofile)
 		if err != nil {
-			log.Fatal(err)
+			log.Fatal().Err(err).Msg("Failed to create memory profile file")
 		}
 		time.AfterFunc(30*time.Second, func() {
 			pprof.WriteHeapProfile(f)
diff --git a/emitter.go b/emitter.go
deleted file mode 100644
index 6680c896..00000000
--- a/emitter.go
+++ /dev/null
@@ -1,159 +0,0 @@
-package goreplay
-
-import (
-	"fmt"
-	"github.com/buger/goreplay/internal/byteutils"
-	"hash/fnv"
-	"io"
-	"log"
-	"sync"
-
-	"github.com/coocood/freecache"
-)
-
-// Emitter represents an abject to manage plugins communication
-type Emitter struct {
-	sync.WaitGroup
-	plugins *InOutPlugins
-}
-
-// NewEmitter creates and initializes new Emitter object.
-func NewEmitter() *Emitter {
-	return &Emitter{}
-}
-
-// Start initialize loop for sending data from inputs to outputs
-func (e *Emitter) Start(plugins *InOutPlugins, middlewareCmd string) {
-	if Settings.CopyBufferSize < 1 {
-		Settings.CopyBufferSize = 5 << 20
-	}
-	e.plugins = plugins
-
-	if middlewareCmd != "" {
-		middleware := NewMiddleware(middlewareCmd)
-
-		for _, in := range plugins.Inputs {
-			middleware.ReadFrom(in)
-		}
-
-		e.plugins.Inputs = append(e.plugins.Inputs, middleware)
-		e.plugins.All = append(e.plugins.All, middleware)
-		e.Add(1)
-		go func() {
-			defer e.Done()
-			if err := CopyMulty(middleware, plugins.Outputs...); err != nil {
-				Debug(2, fmt.Sprintf("[EMITTER] error during copy: %q", err))
-			}
-		}()
-	} else {
-		for _, in := range plugins.Inputs {
-			e.Add(1)
-			go func(in PluginReader) {
-				defer e.Done()
-				if err := CopyMulty(in, plugins.Outputs...); err != nil {
-					Debug(2, fmt.Sprintf("[EMITTER] error during copy: %q", err))
-				}
-			}(in)
-		}
-	}
-}
-
-// Close closes all the goroutine and waits for it to finish.
-func (e *Emitter) Close() {
-	for _, p := range e.plugins.All {
-		if cp, ok := p.(io.Closer); ok {
-			cp.Close()
-		}
-	}
-	if len(e.plugins.All) > 0 {
-		// wait for everything to stop
-		e.Wait()
-	}
-	e.plugins.All = nil // avoid Close to make changes again
-}
-
-// CopyMulty copies from 1 reader to multiple writers
-func CopyMulty(src PluginReader, writers ...PluginWriter) error {
-	wIndex := 0
-	modifier := NewHTTPModifier(&Settings.ModifierConfig)
-	filteredRequests := freecache.NewCache(200 * 1024 * 1024) // 200M
-
-	for {
-		msg, err := src.PluginRead()
-		if err != nil {
-			if err == ErrorStopped || err == io.EOF {
-				return nil
-			}
-			return err
-		}
-		if msg != nil && len(msg.Data) > 0 {
-			if len(msg.Data) > int(Settings.CopyBufferSize) {
-				msg.Data = msg.Data[:Settings.CopyBufferSize]
-			}
-			meta := payloadMeta(msg.Meta)
-			if len(meta) < 3 {
-				Debug(2, fmt.Sprintf("[EMITTER] Found malformed record %q from %q", msg.Meta, src))
-				continue
-			}
-			requestID := meta[1]
-			// start a subroutine only when necessary
-			if Settings.Verbose >= 3 {
-				Debug(3, "[EMITTER] input: ", byteutils.SliceToString(msg.Meta[:len(msg.Meta)-1]), " from: ", src)
-			}
-			if modifier != nil {
-				Debug(3, "[EMITTER] modifier:", requestID, "from:", src)
-				if isRequestPayload(msg.Meta) {
-					msg.Data = modifier.Rewrite(msg.Data)
-					// If modifier tells to skip request
-					if len(msg.Data) == 0 {
-						filteredRequests.Set(requestID, []byte{}, 60) //
-						continue
-					}
-					Debug(3, "[EMITTER] Rewritten input:", requestID, "from:", src)
-
-				} else {
-					_, err := filteredRequests.Get(requestID)
-					if err == nil {
-						filteredRequests.Del(requestID)
-						continue
-					}
-				}
-			}
-
-			if Settings.PrettifyHTTP {
-				msg.Data = prettifyHTTP(msg.Data)
-				if len(msg.Data) == 0 {
-					continue
-				}
-			}
-
-			if Settings.SplitOutput {
-				if Settings.RecognizeTCPSessions {
-					if !PRO {
-						log.Fatal("Detailed TCP sessions work only with PRO license")
-					}
-					hasher := fnv.New32a()
-					hasher.Write(meta[1])
-
-					wIndex = int(hasher.Sum32()) % len(writers)
-					if _, err := writers[wIndex].PluginWrite(msg); err != nil {
-						return err
-					}
-				} else {
-					// Simple round robin
-					if _, err := writers[wIndex].PluginWrite(msg); err != nil {
-						return err
-					}
-
-					wIndex = (wIndex + 1) % len(writers)
-				}
-			} else {
-				for _, dst := range writers {
-					if _, err := dst.PluginWrite(msg); err != nil && err != io.ErrClosedPipe {
-						return err
-					}
-				}
-			}
-		}
-	}
-}
diff --git a/emitter_test.go b/emitter_test.go
deleted file mode 100644
index b95d701f..00000000
--- a/emitter_test.go
+++ /dev/null
@@ -1,263 +0,0 @@
-package goreplay
-
-import (
-	"fmt"
-	"os"
-	"sync"
-	"sync/atomic"
-	"testing"
-	"time"
-)
-
-func TestMain(m *testing.M) {
-	PRO = true
-	code := m.Run()
-	os.Exit(code)
-}
-
-func TestEmitter(t *testing.T) {
-	wg := new(sync.WaitGroup)
-
-	input := NewTestInput()
-	output := NewTestOutput(func(*Message) {
-		wg.Done()
-	})
-
-	plugins := &InOutPlugins{
-		Inputs:  []PluginReader{input},
-		Outputs: []PluginWriter{output},
-	}
-	plugins.All = append(plugins.All, input, output)
-
-	emitter := NewEmitter()
-	go emitter.Start(plugins, Settings.Middleware)
-
-	for i := 0; i < 1000; i++ {
-		wg.Add(1)
-		input.EmitGET()
-	}
-
-	wg.Wait()
-	emitter.Close()
-}
-
-func TestEmitterFiltered(t *testing.T) {
-	wg := new(sync.WaitGroup)
-
-	input := NewTestInput()
-	input.skipHeader = true
-
-	output := NewTestOutput(func(*Message) {
-		wg.Done()
-	})
-
-	plugins := &InOutPlugins{
-		Inputs:  []PluginReader{input},
-		Outputs: []PluginWriter{output},
-	}
-	plugins.All = append(plugins.All, input, output)
-
-	methods := HTTPMethods{[]byte("GET")}
-	Settings.ModifierConfig = HTTPModifierConfig{Methods: methods}
-
-	emitter := &Emitter{}
-	go emitter.Start(plugins, "")
-
-	wg.Add(2)
-
-	id := uuid()
-	reqh := payloadHeader(RequestPayload, id, time.Now().UnixNano(), -1)
-	reqb := append(reqh, []byte("POST / HTTP/1.1\r\nHost: www.w3.org\r\nUser-Agent: Go 1.1 package http\r\nAccept-Encoding: gzip\r\n\r\n")...)
-
-	resh := payloadHeader(ResponsePayload, id, time.Now().UnixNano()+1, 1)
-	respb := append(resh, []byte("HTTP/1.1 200 OK\r\nContent-Length: 0\r\n\r\n")...)
-
-	input.EmitBytes(reqb)
-	input.EmitBytes(respb)
-
-	id = uuid()
-	reqh = payloadHeader(RequestPayload, id, time.Now().UnixNano(), -1)
-	reqb = append(reqh, []byte("GET / HTTP/1.1\r\nHost: www.w3.org\r\nUser-Agent: Go 1.1 package http\r\nAccept-Encoding: gzip\r\n\r\n")...)
-
-	resh = payloadHeader(ResponsePayload, id, time.Now().UnixNano()+1, 1)
-	respb = append(resh, []byte("HTTP/1.1 200 OK\r\nContent-Length: 0\r\n\r\n")...)
-
-	input.EmitBytes(reqb)
-	input.EmitBytes(respb)
-
-	wg.Wait()
-	emitter.Close()
-
-	Settings.ModifierConfig = HTTPModifierConfig{}
-}
-
-func TestEmitterSplitRoundRobin(t *testing.T) {
-	wg := new(sync.WaitGroup)
-
-	input := NewTestInput()
-
-	var counter1, counter2 int32
-
-	output1 := NewTestOutput(func(*Message) {
-		atomic.AddInt32(&counter1, 1)
-		wg.Done()
-	})
-
-	output2 := NewTestOutput(func(*Message) {
-		atomic.AddInt32(&counter2, 1)
-		wg.Done()
-	})
-
-	plugins := &InOutPlugins{
-		Inputs:  []PluginReader{input},
-		Outputs: []PluginWriter{output1, output2},
-	}
-
-	Settings.SplitOutput = true
-
-	emitter := NewEmitter()
-	go emitter.Start(plugins, Settings.Middleware)
-
-	for i := 0; i < 1000; i++ {
-		wg.Add(1)
-		input.EmitGET()
-	}
-
-	wg.Wait()
-
-	emitter.Close()
-
-	if counter1 == 0 || counter2 == 0 || counter1 != counter2 {
-		t.Errorf("Round robin should split traffic equally: %d vs %d", counter1, counter2)
-	}
-
-	Settings.SplitOutput = false
-}
-
-func TestEmitterRoundRobin(t *testing.T) {
-	wg := new(sync.WaitGroup)
-
-	input := NewTestInput()
-
-	var counter1, counter2 int32
-
-	output1 := NewTestOutput(func(*Message) {
-		counter1++
-		wg.Done()
-	})
-
-	output2 := NewTestOutput(func(*Message) {
-		counter2++
-		wg.Done()
-	})
-
-	plugins := &InOutPlugins{
-		Inputs:  []PluginReader{input},
-		Outputs: []PluginWriter{output1, output2},
-	}
-	plugins.All = append(plugins.All, input, output1, output2)
-
-	Settings.SplitOutput = true
-
-	emitter := NewEmitter()
-	go emitter.Start(plugins, Settings.Middleware)
-
-	for i := 0; i < 1000; i++ {
-		wg.Add(1)
-		input.EmitGET()
-	}
-
-	wg.Wait()
-	emitter.Close()
-
-	if counter1 == 0 || counter2 == 0 {
-		t.Errorf("Round robin should split traffic equally: %d vs %d", counter1, counter2)
-	}
-
-	Settings.SplitOutput = false
-}
-
-func TestEmitterSplitSession(t *testing.T) {
-	wg := new(sync.WaitGroup)
-	wg.Add(200)
-
-	input := NewTestInput()
-	input.skipHeader = true
-
-	var counter1, counter2 int32
-
-	output1 := NewTestOutput(func(msg *Message) {
-		if payloadID(msg.Meta)[0] == 'a' {
-			counter1++
-		}
-		wg.Done()
-	})
-
-	output2 := NewTestOutput(func(msg *Message) {
-		if payloadID(msg.Meta)[0] == 'b' {
-			counter2++
-		}
-		wg.Done()
-	})
-
-	plugins := &InOutPlugins{
-		Inputs:  []PluginReader{input},
-		Outputs: []PluginWriter{output1, output2},
-	}
-
-	Settings.SplitOutput = true
-	Settings.RecognizeTCPSessions = true
-
-	emitter := NewEmitter()
-	go emitter.Start(plugins, Settings.Middleware)
-
-	for i := 0; i < 200; i++ {
-		// Keep session but randomize
-		id := make([]byte, 20)
-		if i&1 == 0 { // for recognizeTCPSessions one should be odd and other will be even number
-			id[0] = 'a'
-		} else {
-			id[0] = 'b'
-		}
-		input.EmitBytes([]byte(fmt.Sprintf("1 %s 1 1\nGET / HTTP/1.1\r\n\r\n", id[:20])))
-	}
-
-	wg.Wait()
-
-	if counter1 != counter2 {
-		t.Errorf("Round robin should split traffic equally: %d vs %d", counter1, counter2)
-	}
-
-	Settings.SplitOutput = false
-	Settings.RecognizeTCPSessions = false
-	emitter.Close()
-}
-
-func BenchmarkEmitter(b *testing.B) {
-	wg := new(sync.WaitGroup)
-
-	input := NewTestInput()
-
-	output := NewTestOutput(func(*Message) {
-		wg.Done()
-	})
-
-	plugins := &InOutPlugins{
-		Inputs:  []PluginReader{input},
-		Outputs: []PluginWriter{output},
-	}
-	plugins.All = append(plugins.All, input, output)
-
-	emitter := NewEmitter()
-	go emitter.Start(plugins, Settings.Middleware)
-
-	b.ResetTimer()
-
-	for i := 0; i < b.N; i++ {
-		wg.Add(1)
-		input.EmitGET()
-	}
-
-	wg.Wait()
-	emitter.Close()
-}
diff --git a/examples/middleware/token_modifier.go b/examples/middleware/token_modifier.go
index b623483e..8c34a05d 100644
--- a/examples/middleware/token_modifier.go
+++ b/examples/middleware/token_modifier.go
@@ -24,8 +24,9 @@ import (
 	"bytes"
 	"encoding/hex"
 	"fmt"
-	"github.com/buger/goreplay/proto"
 	"os"
+
+	proto "github.com/buger/goreplay/pkg/http_proto"
 )
 
 // requestID -> originalToken
diff --git a/go.mod b/go.mod
index 43eab40a..a1906116 100644
--- a/go.mod
+++ b/go.mod
@@ -10,10 +10,11 @@ require (
 	github.com/gorilla/websocket v1.4.2
 	github.com/klauspost/compress v1.11.13 // indirect
 	github.com/mattbaird/elastigo v0.0.0-20170123220020-2fe47fd29e4b
+	github.com/rs/zerolog v1.28.0
 	github.com/stretchr/testify v1.7.0
 	github.com/xdg-go/scram v1.1.1
 	golang.org/x/net v0.0.0-20211209124913-491a49abca63
-	golang.org/x/sys v0.0.0-20210831042530-f4d43177bf5e
+	golang.org/x/sys v0.0.0-20210927094055-39ccf1dd6fa6
 	k8s.io/apimachinery v0.23.3
 	k8s.io/client-go v0.23.3
 )
@@ -38,6 +39,8 @@ require (
 	github.com/jcmturner/gofork v1.0.0 // indirect
 	github.com/jmespath/go-jmespath v0.3.0 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/mattn/go-colorable v0.1.12 // indirect
+	github.com/mattn/go-isatty v0.0.14 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
 	github.com/pierrec/lz4 v2.4.1+incompatible // indirect
diff --git a/go.sum b/go.sum
index 521c6a92..ef968037 100644
--- a/go.sum
+++ b/go.sum
@@ -75,6 +75,7 @@ github.com/cncf/udpa/go v0.0.0-20200629203442-efcf912fb354/go.mod h1:WmhPx2Nbnht
 github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
 github.com/coocood/freecache v1.2.0 h1:p8RhjN6Y4DRBIMzdRlm1y+M7h7YJxye3lGW8/VvzCz0=
 github.com/coocood/freecache v1.2.0/go.mod h1:OKrEjkGVoxZhyWAJoeFi5BMLUJm2Tit0kpGkIr7NGYY=
+github.com/coreos/go-systemd/v22 v22.3.3-0.20220203105225-a9a7ef127534/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc=
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
@@ -118,6 +119,7 @@ github.com/go-openapi/jsonpointer v0.19.5/go.mod h1:Pl9vOtqEWErmShwVjC8pYs9cog34
 github.com/go-openapi/jsonreference v0.19.3/go.mod h1:rjx6GuL8TTa9VaixXglHmQmIL98+wF9xc8zWvFonSJ8=
 github.com/go-openapi/swag v0.19.5/go.mod h1:POnQmlKehdgb5mhVOsnJFsivZCEZ/vjK9gh66Z9tfKk=
 github.com/go-sql-driver/mysql v1.5.0/go.mod h1:DCzpHaOWr8IXmIStZouvnhqoel9Qv2LBy8hT2VhHyBg=
+github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
 github.com/gogo/protobuf v1.3.2 h1:Ov1cvc58UF3b5XjBnZv7+opcTcQFZebYjWzi34vdm4Q=
 github.com/gogo/protobuf v1.3.2/go.mod h1:P1XiOD3dCwIKUDQYPy72D8LYyHL2YPYrpS2s69NZV8Q=
 github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
@@ -235,6 +237,10 @@ github.com/mailru/easyjson v0.0.0-20190614124828-94de47d64c63/go.mod h1:C1wdFJiN
 github.com/mailru/easyjson v0.0.0-20190626092158-b2ccc519800e/go.mod h1:C1wdFJiN94OJF2b5HbByQZoLdCWB1Yqtg26g4irojpc=
 github.com/mattbaird/elastigo v0.0.0-20170123220020-2fe47fd29e4b h1:v29yPGHhOqw7VHEnTeQFAth3SsBrmwc8JfuhNY0G34k=
 github.com/mattbaird/elastigo v0.0.0-20170123220020-2fe47fd29e4b/go.mod h1:5MWrJXKRQyhQdUCF+vu6U5c4nQpg70vW3eHaU0/AYbU=
+github.com/mattn/go-colorable v0.1.12 h1:jF+Du6AlPIjs2BiUiQlKOX0rt3SujHxPnksPKZbaA40=
+github.com/mattn/go-colorable v0.1.12/go.mod h1:u5H1YNBxpqRaxsYJYSkiCWKzEfiAb1Gb520KVy5xxl4=
+github.com/mattn/go-isatty v0.0.14 h1:yVuAays6BHfxijgZPzw+3Zlu5yQgKGP2/hcQbHb7S9Y=
+github.com/mattn/go-isatty v0.0.14/go.mod h1:7GGIvUiUoEMVVmxf/4nioHXj79iQHKdU27kJ6hsGG94=
 github.com/mitchellh/mapstructure v1.1.2/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh9fWfEaFds41c1Y=
 github.com/moby/spdystream v0.2.0/go.mod h1:f7i0iNDQJ059oMTcWxx8MA/zKFIuD/lY+0GqbN2Wy8c=
 github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
@@ -268,6 +274,9 @@ github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:
 github.com/rcrowley/go-metrics v0.0.0-20190826022208-cac0b30c2563 h1:dY6ETXrvDG7Sa4vE8ZQG4yqWg6UnOcbqTAahkV813vQ=
 github.com/rcrowley/go-metrics v0.0.0-20190826022208-cac0b30c2563/go.mod h1:bCqnVzQkZxMG4s8nGwiZ5l3QUCyqpo9Y+/ZMZ9VjZe4=
 github.com/rogpeppe/go-internal v1.3.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFRclV5y23lUDJ4=
+github.com/rs/xid v1.4.0/go.mod h1:trrq9SKmegXys3aeAKXMUTdJsYXVwGY3RLcfgqegfbg=
+github.com/rs/zerolog v1.28.0 h1:MirSo27VyNi7RJYP3078AA1+Cyzd2GB66qy3aUHvsWY=
+github.com/rs/zerolog v1.28.0/go.mod h1:NILgTygv/Uej1ra5XxGf82ZFSLk58MFGAUS2o6usyD0=
 github.com/smartystreets/assertions v1.2.0 h1:42S6lae5dvLc7BrLu/0ugRtcFVjoJNMC/N3yZFZkDFs=
 github.com/smartystreets/assertions v1.2.0/go.mod h1:tcbTF8ujkAEcZ8TElKY+i30BzYlVhC/LOxJk7iOWnoo=
 github.com/smartystreets/goconvey v1.7.2 h1:9RBaZCeXEQ3UselpuwUQHltGVXvdwm6cv1hgR6gDIPg=
@@ -460,8 +469,10 @@ golang.org/x/sys v0.0.0-20210330210617-4fbd30eecc44/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210510120138-977fb7262007/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20210831042530-f4d43177bf5e h1:XMgFehsDnnLGtjvjOfqWSUzt0alpTR1RSEuznObga2c=
+golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20210831042530-f4d43177bf5e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20210927094055-39ccf1dd6fa6 h1:foEbQz/B0Oz6YIqu/69kfXPYeFQAuuMYFkjaqXzl5Wo=
+golang.org/x/sys v0.0.0-20210927094055-39ccf1dd6fa6/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/term v0.0.0-20210615171337-6886f2dfbf5b h1:9zKuko04nR4gjZ4+DNjHqRlAJqbJETHwiNKDqTfOjfE=
 golang.org/x/term v0.0.0-20210615171337-6886f2dfbf5b/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
diff --git a/gor_stat.go b/gor_stat.go
deleted file mode 100644
index 46ce3580..00000000
--- a/gor_stat.go
+++ /dev/null
@@ -1,64 +0,0 @@
-package goreplay
-
-import (
-	"runtime"
-	"strconv"
-	"time"
-)
-
-type GorStat struct {
-	statName string
-	rateMs   int
-	latest   int
-	mean     int
-	max      int
-	count    int
-}
-
-func NewGorStat(statName string, rateMs int) (s *GorStat) {
-	s = new(GorStat)
-	s.statName = statName
-	s.rateMs = rateMs
-	s.latest = 0
-	s.mean = 0
-	s.max = 0
-	s.count = 0
-
-	if Settings.Stats {
-		go s.reportStats()
-	}
-	return
-}
-
-func (s *GorStat) Write(latest int) {
-	if Settings.Stats {
-		if latest > s.max {
-			s.max = latest
-		}
-		if latest != 0 {
-			s.mean = ((s.mean * s.count) + latest) / (s.count + 1)
-		}
-		s.latest = latest
-		s.count = s.count + 1
-	}
-}
-
-func (s *GorStat) Reset() {
-	s.latest = 0
-	s.max = 0
-	s.mean = 0
-	s.count = 0
-}
-
-func (s *GorStat) String() string {
-	return s.statName + ":" + strconv.Itoa(s.latest) + "," + strconv.Itoa(s.mean) + "," + strconv.Itoa(s.max) + "," + strconv.Itoa(s.count) + "," + strconv.Itoa(s.count/(s.rateMs/1000.0)) + "," + strconv.Itoa(runtime.NumGoroutine())
-}
-
-func (s *GorStat) reportStats() {
-	Debug(0, "\n", s.statName+":latest,mean,max,count,count/second,gcount")
-	for {
-		Debug(0, "\n", s)
-		s.Reset()
-		time.Sleep(time.Duration(s.rateMs) * time.Millisecond)
-	}
-}
diff --git a/http_prettifier.go b/http_prettifier.go
deleted file mode 100644
index 596c6b24..00000000
--- a/http_prettifier.go
+++ /dev/null
@@ -1,66 +0,0 @@
-package goreplay
-
-import (
-	"bytes"
-	"compress/gzip"
-	"fmt"
-	"github.com/buger/goreplay/proto"
-	"io/ioutil"
-	"net/http/httputil"
-	"strconv"
-)
-
-func prettifyHTTP(p []byte) []byte {
-
-	tEnc := bytes.Equal(proto.Header(p, []byte("Transfer-Encoding")), []byte("chunked"))
-	cEnc := bytes.Equal(proto.Header(p, []byte("Content-Encoding")), []byte("gzip"))
-
-	if !(tEnc || cEnc) {
-		return p
-	}
-
-	headersPos := proto.MIMEHeadersEndPos(p)
-
-	if headersPos < 5 || headersPos > len(p) {
-		return p
-	}
-
-	headers := p[:headersPos]
-	content := p[headersPos:]
-
-	if tEnc {
-		buf := bytes.NewReader(content)
-		r := httputil.NewChunkedReader(buf)
-		content, _ = ioutil.ReadAll(r)
-
-		headers = proto.DeleteHeader(headers, []byte("Transfer-Encoding"))
-
-		newLen := strconv.Itoa(len(content))
-		headers = proto.SetHeader(headers, []byte("Content-Length"), []byte(newLen))
-	}
-
-	if cEnc {
-		buf := bytes.NewReader(content)
-		g, err := gzip.NewReader(buf)
-
-		if err != nil {
-			Debug(1, "[Prettifier] GZIP encoding error:", err)
-			return []byte{}
-		}
-
-		content, err = ioutil.ReadAll(g)
-		if err != nil {
-			Debug(1, fmt.Sprintf("[HTTP-PRETTIFIER] %q", err))
-			return p
-		}
-
-		headers = proto.DeleteHeader(headers, []byte("Content-Encoding"))
-
-		newLen := strconv.Itoa(len(content))
-		headers = proto.SetHeader(headers, []byte("Content-Length"), []byte(newLen))
-	}
-
-	newPayload := append(headers, content...)
-
-	return newPayload
-}
diff --git a/internal/capture/capture.go b/internal/capture/capture.go
index b2a31f1d..fb163508 100644
--- a/internal/capture/capture.go
+++ b/internal/capture/capture.go
@@ -5,9 +5,6 @@ import (
 	"errors"
 	"expvar"
 	"fmt"
-	"github.com/buger/goreplay/internal/size"
-	"github.com/buger/goreplay/internal/tcp"
-	"github.com/buger/goreplay/proto"
 	"io"
 	"log"
 	"net"
@@ -18,6 +15,10 @@ import (
 	"syscall"
 	"time"
 
+	"github.com/buger/goreplay/internal/size"
+	"github.com/buger/goreplay/internal/tcp"
+	"github.com/buger/goreplay/pkg/http_proto"
+
 	"github.com/google/gopacket"
 	"github.com/google/gopacket/layers"
 	"github.com/google/gopacket/pcap"
@@ -500,11 +501,11 @@ func (l *Listener) SocketHandle(ifi pcap.Interface) (handle Socket, err error) {
 }
 
 func http1StartHint(pckt *tcp.Packet) (isRequest, isResponse bool) {
-	if proto.HasRequestTitle(pckt.Payload) {
+	if http_proto.HasRequestTitle(pckt.Payload) {
 		return true, false
 	}
 
-	if proto.HasResponseTitle(pckt.Payload) {
+	if http_proto.HasResponseTitle(pckt.Payload) {
 		return false, true
 	}
 
@@ -518,7 +519,7 @@ func http1EndHint(m *tcp.Message) bool {
 	}
 
 	req, res := http1StartHint(m.Packets()[0])
-	return proto.HasFullPayload(m, m.PacketData()...) && (req || res)
+	return http_proto.HasFullPayload(m, m.PacketData()...) && (req || res)
 }
 
 func (l *Listener) readHandle(key string, hndl packetHandle) {
diff --git a/internal/tcp/tcp_message.go b/internal/tcp/tcp_message.go
index e2a2188a..1f9701e5 100644
--- a/internal/tcp/tcp_message.go
+++ b/internal/tcp/tcp_message.go
@@ -4,12 +4,13 @@ import (
 	"encoding/binary"
 	"encoding/hex"
 	"fmt"
-	"github.com/buger/goreplay/proto"
 	"net"
 	"reflect"
 	"sort"
 	"time"
 	"unsafe"
+
+	"github.com/buger/goreplay/pkg/http_proto"
 )
 
 // TCPProtocol is a number to indicate type of protocol
@@ -169,9 +170,9 @@ func (m *Message) Data() []byte {
 	}
 
 	// Remove Expect header, since its replay not fully supported
-	if state, ok := m.feedback.(*proto.HTTPState); ok {
+	if state, ok := m.feedback.(*http_proto.HTTPState); ok {
 		if state.Continue100 {
-			tmp = proto.DeleteHeader(tmp, []byte("Expect"))
+			tmp = http_proto.DeleteHeader(tmp, []byte("Expect"))
 		}
 	}
 
@@ -376,7 +377,7 @@ func (parser *MessageParser) addPacket(m *Message, pckt *Packet) bool {
 
 func (parser *MessageParser) Fix100Continue(m *Message) {
 	// Only adjust a message once
-	if state, ok := m.feedback.(*proto.HTTPState); ok && state.Continue100 && !m.continueAdjusted {
+	if state, ok := m.feedback.(*http_proto.HTTPState); ok && state.Continue100 && !m.continueAdjusted {
 		// Shift Ack by given offset
 		// Size of "HTTP/1.1 100 Continue\r\n\r\n" message
 		for _, p := range m.packets {
diff --git a/internal/tcp/tcp_test.go b/internal/tcp/tcp_test.go
index e820d9c2..3dfaaae3 100644
--- a/internal/tcp/tcp_test.go
+++ b/internal/tcp/tcp_test.go
@@ -3,16 +3,14 @@ package tcp
 import (
 	"bytes"
 	"encoding/binary"
-	"github.com/buger/goreplay/proto"
-
-	// "runtime"
 	"testing"
 	"time"
 
-	"github.com/stretchr/testify/assert"
+	proto "github.com/buger/goreplay/pkg/http_proto"
 
 	"github.com/google/gopacket"
 	"github.com/google/gopacket/layers"
+	"github.com/stretchr/testify/assert"
 )
 
 func generateHeader(request bool, seq uint32, length uint16) []byte {
diff --git a/limiter_test.go b/limiter_test.go
deleted file mode 100644
index 6408dd2d..00000000
--- a/limiter_test.go
+++ /dev/null
@@ -1,111 +0,0 @@
-//go:build !race
-
-package goreplay
-
-import (
-	"sync"
-	"testing"
-)
-
-func TestOutputLimiter(t *testing.T) {
-	wg := new(sync.WaitGroup)
-
-	input := NewTestInput()
-	output := NewLimiter(NewTestOutput(func(*Message) {
-		wg.Done()
-	}), "10")
-	wg.Add(10)
-
-	plugins := &InOutPlugins{
-		Inputs:  []PluginReader{input},
-		Outputs: []PluginWriter{output},
-	}
-	plugins.All = append(plugins.All, input, output)
-
-	emitter := NewEmitter()
-	go emitter.Start(plugins, Settings.Middleware)
-
-	for i := 0; i < 100; i++ {
-		input.EmitGET()
-	}
-
-	wg.Wait()
-	emitter.Close()
-}
-
-func TestInputLimiter(t *testing.T) {
-	wg := new(sync.WaitGroup)
-
-	input := NewLimiter(NewTestInput(), "10")
-	output := NewTestOutput(func(*Message) {
-		wg.Done()
-	})
-	wg.Add(10)
-
-	plugins := &InOutPlugins{
-		Inputs:  []PluginReader{input},
-		Outputs: []PluginWriter{output},
-	}
-	plugins.All = append(plugins.All, input, output)
-
-	emitter := NewEmitter()
-	go emitter.Start(plugins, Settings.Middleware)
-
-	for i := 0; i < 100; i++ {
-		input.(*Limiter).plugin.(*TestInput).EmitGET()
-	}
-
-	wg.Wait()
-	emitter.Close()
-}
-
-// Should limit all requests
-func TestPercentLimiter1(t *testing.T) {
-	wg := new(sync.WaitGroup)
-
-	input := NewTestInput()
-	output := NewLimiter(NewTestOutput(func(*Message) {
-		wg.Done()
-	}), "0%")
-
-	plugins := &InOutPlugins{
-		Inputs:  []PluginReader{input},
-		Outputs: []PluginWriter{output},
-	}
-	plugins.All = append(plugins.All, input, output)
-
-	emitter := NewEmitter()
-	go emitter.Start(plugins, Settings.Middleware)
-
-	for i := 0; i < 100; i++ {
-		input.EmitGET()
-	}
-
-	wg.Wait()
-}
-
-// Should not limit at all
-func TestPercentLimiter2(t *testing.T) {
-	wg := new(sync.WaitGroup)
-
-	input := NewTestInput()
-	output := NewLimiter(NewTestOutput(func(*Message) {
-		wg.Done()
-	}), "100%")
-	wg.Add(100)
-
-	plugins := &InOutPlugins{
-		Inputs:  []PluginReader{input},
-		Outputs: []PluginWriter{output},
-	}
-	plugins.All = append(plugins.All, input, output)
-
-	emitter := NewEmitter()
-	go emitter.Start(plugins, Settings.Middleware)
-
-	for i := 0; i < 100; i++ {
-		input.EmitGET()
-	}
-
-	wg.Wait()
-}
diff --git a/output_binary.go b/pkg/binary/output_binary.go
similarity index 74%
rename from output_binary.go
rename to pkg/binary/output_binary.go
index 7f775734..9effcb2d 100644
--- a/output_binary.go
+++ b/pkg/binary/output_binary.go
@@ -1,11 +1,22 @@
-package goreplay
+package binary
 
 import (
-	"github.com/buger/goreplay/internal/size"
 	"sync/atomic"
 	"time"
+
+	"github.com/buger/goreplay/internal/size"
+	"github.com/buger/goreplay/pkg/plugin"
+	"github.com/buger/goreplay/pkg/proto"
+
+	"github.com/rs/zerolog/log"
 )
 
+const (
+	initialDynamicWorkers = 10
+)
+
+var outputLogger = log.With().Str("component", "output_binary").Logger()
+
 // BinaryOutputConfig struct for holding binary output configuration
 type BinaryOutputConfig struct {
 	Workers        int           `json:"output-binary-workers"`
@@ -24,24 +35,23 @@ type BinaryOutput struct {
 	// aligned at 64bit. See https://github.com/golang/go/issues/599
 	activeWorkers int64
 	address       string
-	queue         chan *Message
-	responses     chan response
+	queue         chan *plugin.Message
+	responses     chan plugin.Response
 	needWorker    chan int
 	quit          chan struct{}
 	config        *BinaryOutputConfig
-	queueStats    *GorStat
 }
 
 // NewBinaryOutput constructor for BinaryOutput
 // Initialize workers
-func NewBinaryOutput(address string, config *BinaryOutputConfig) PluginReadWriter {
+func NewBinaryOutput(address string, config *BinaryOutputConfig) plugin.ReadWriter {
 	o := new(BinaryOutput)
 
 	o.address = address
 	o.config = config
 
-	o.queue = make(chan *Message, 1000)
-	o.responses = make(chan response, 1000)
+	o.queue = make(chan *plugin.Message, 1000)
+	o.responses = make(chan plugin.Response, 1000)
 	o.needWorker = make(chan int, 1)
 	o.quit = make(chan struct{})
 
@@ -109,8 +119,8 @@ func (o *BinaryOutput) startWorker() {
 }
 
 // PluginWrite writes a message tothis plugin
-func (o *BinaryOutput) PluginWrite(msg *Message) (n int, err error) {
-	if !isRequestPayload(msg.Meta) {
+func (o *BinaryOutput) PluginWrite(msg *plugin.Message) (n int, err error) {
+	if !proto.IsRequestPayload(msg.Meta) {
 		return len(msg.Data), nil
 	}
 
@@ -128,37 +138,37 @@ func (o *BinaryOutput) PluginWrite(msg *Message) (n int, err error) {
 }
 
 // PluginRead reads a message from this plugin
-func (o *BinaryOutput) PluginRead() (*Message, error) {
-	var resp response
-	var msg Message
+func (o *BinaryOutput) PluginRead() (*plugin.Message, error) {
+	var resp plugin.Response
+	var msg plugin.Message
 	select {
 	case <-o.quit:
-		return nil, ErrorStopped
+		return nil, plugin.ErrorStopped
 	case resp = <-o.responses:
 	}
-	msg.Data = resp.payload
-	msg.Meta = payloadHeader(ReplayedResponsePayload, resp.uuid, resp.startedAt, resp.roundTripTime)
+	msg.Data = resp.Payload
+	msg.Meta = proto.PayloadHeader(proto.ReplayedResponsePayload, resp.UUID, resp.StartedAt, resp.RoundTripTime)
 
 	return &msg, nil
 }
 
-func (o *BinaryOutput) sendRequest(client *TCPClient, msg *Message) {
-	if !isRequestPayload(msg.Meta) {
+func (o *BinaryOutput) sendRequest(client *TCPClient, msg *plugin.Message) {
+	if !proto.IsRequestPayload(msg.Meta) {
 		return
 	}
 
-	uuid := payloadID(msg.Meta)
+	uuid := proto.PayloadID(msg.Meta)
 
 	start := time.Now()
 	resp, err := client.Send(msg.Data)
 	stop := time.Now()
 
 	if err != nil {
-		Debug(1, "Request error:", err)
+		outputLogger.Error().Err(err).Msg("Request error")
 	}
 
 	if o.config.TrackResponses {
-		o.responses <- response{resp, uuid, start.UnixNano(), stop.UnixNano() - start.UnixNano()}
+		o.responses <- plugin.Response{resp, uuid, start.UnixNano(), stop.UnixNano() - start.UnixNano()}
 	}
 }
 
diff --git a/tcp_client.go b/pkg/binary/tcp_client.go
similarity index 77%
rename from tcp_client.go
rename to pkg/binary/tcp_client.go
index 156ffcac..adec39e6 100644
--- a/tcp_client.go
+++ b/pkg/binary/tcp_client.go
@@ -1,14 +1,18 @@
-package goreplay
+package binary
 
 import (
 	"crypto/tls"
 	"io"
 	"net"
-	"runtime/debug"
 	"syscall"
 	"time"
 )
 
+const (
+	maxResponseSize = 1073741824
+	readChunkSize   = 64 * 1024
+)
+
 // TCPClientConfig client configuration
 type TCPClientConfig struct {
 	Debug              bool
@@ -70,7 +74,8 @@ func (c *TCPClient) Disconnect() {
 	if c.conn != nil {
 		c.conn.Close()
 		c.conn = nil
-		Debug(1, "[TCPClient] Disconnected: ", c.baseURL)
+
+		outputLogger.Warn().Msgf("Disconnected: %s", c.baseURL)
 	}
 }
 
@@ -84,10 +89,10 @@ func (c *TCPClient) isAlive() bool {
 	if err == nil {
 		return true
 	} else if err == io.EOF {
-		Debug(1, "[TCPClient] connection closed, reconnecting")
+		outputLogger.Warn().Msg("connection closed, reconnecting")
 		return false
 	} else if err == syscall.EPIPE {
-		Debug(1, "Detected broken pipe.", err)
+		outputLogger.Warn().Msg("broken pipe, reconnecting")
 		return false
 	}
 
@@ -99,19 +104,18 @@ func (c *TCPClient) Send(data []byte) (response []byte, err error) {
 	// Don't exit on panic
 	defer func() {
 		if r := recover(); r != nil {
-			Debug(1, "[TCPClient]", r, string(data))
+			outputLogger.Error().Msgf("PANIC: pkg: %v", r)
 
 			if _, ok := r.(error); !ok {
-				Debug(1, "[TCPClient] Failed to send request: ", string(data))
-				Debug(1, "PANIC: pkg:", r, debug.Stack())
+				outputLogger.Error().Stack().Msgf("faile to send request: %s", string(data))
 			}
 		}
 	}()
 
 	if c.conn == nil || !c.isAlive() {
-		Debug(1, "[TCPClient] Connecting:", c.baseURL)
+		outputLogger.Info().Msgf("Connecting: %s", c.baseURL)
 		if err = c.Connect(); err != nil {
-			Debug(1, "[TCPClient] Connection error:", err)
+			outputLogger.Error().Err(err).Msgf("Connection error: %s", c.baseURL)
 			return
 		}
 	}
@@ -121,11 +125,11 @@ func (c *TCPClient) Send(data []byte) (response []byte, err error) {
 	c.conn.SetWriteDeadline(timeout)
 
 	if c.config.Debug {
-		Debug(1, "[TCPClient] Sending:", string(data))
+		outputLogger.Debug().Msgf("Sending: %s", string(data))
 	}
 
 	if _, err = c.conn.Write(data); err != nil {
-		Debug(1, "[TCPClient] Write error:", err, c.baseURL)
+		outputLogger.Error().Err(err).Msgf("Write error: %s", c.baseURL)
 		return
 	}
 
@@ -156,7 +160,7 @@ func (c *TCPClient) Send(data []byte) (response []byte, err error) {
 			if err == io.EOF {
 				break
 			} else if err != nil {
-				Debug(1, "[TCPClient] Read the whole body error:", err, c.baseURL)
+				outputLogger.Error().Err(err).Msgf("Read error: %s", c.baseURL)
 				break
 			}
 
@@ -164,8 +168,7 @@ func (c *TCPClient) Send(data []byte) (response []byte, err error) {
 		}
 
 		if readBytes >= maxResponseSize {
-			Debug(1, "[TCPClient] Body is more than the max size", maxResponseSize,
-				c.baseURL)
+			outputLogger.Error().Msgf("Body is more than the max size: %d", maxResponseSize)
 			break
 		}
 
@@ -174,7 +177,7 @@ func (c *TCPClient) Send(data []byte) (response []byte, err error) {
 	}
 
 	if err != nil {
-		Debug(1, "[TCPClient] Response read error", err, c.conn, readBytes)
+		outputLogger.Error().Err(err).Msgf("Response read error")
 		return
 	}
 
@@ -186,7 +189,7 @@ func (c *TCPClient) Send(data []byte) (response []byte, err error) {
 	copy(payload, c.respBuf[:readBytes])
 
 	if c.config.Debug {
-		Debug(1, "[TCPClient] Received:", string(payload))
+		outputLogger.Debug().Msgf("Received: %s", string(payload))
 	}
 
 	return payload, err
diff --git a/input_dummy.go b/pkg/dummy/input_dummy.go
similarity index 67%
rename from input_dummy.go
rename to pkg/dummy/input_dummy.go
index cca7fe34..b20ad1e1 100644
--- a/input_dummy.go
+++ b/pkg/dummy/input_dummy.go
@@ -1,7 +1,10 @@
-package goreplay
+package dummy
 
 import (
 	"time"
+
+	"github.com/buger/goreplay/pkg/plugin"
+	"github.com/buger/goreplay/pkg/proto"
 )
 
 // DummyInput used for debugging. It generate 1 "GET /"" request per second.
@@ -22,13 +25,13 @@ func NewDummyInput(options string) (di *DummyInput) {
 }
 
 // PluginRead reads message from this plugin
-func (i *DummyInput) PluginRead() (*Message, error) {
-	var msg Message
+func (i *DummyInput) PluginRead() (*plugin.Message, error) {
+	var msg plugin.Message
 	select {
 	case <-i.quit:
-		return nil, ErrorStopped
+		return nil, plugin.ErrorStopped
 	case buf := <-i.data:
-		msg.Meta, msg.Data = payloadMetaWithBody(buf)
+		msg.Meta, msg.Data = proto.PayloadMetaWithBody(buf)
 		return &msg, nil
 	}
 }
@@ -37,11 +40,11 @@ func (i *DummyInput) emit() {
 	ticker := time.NewTicker(time.Second)
 
 	for range ticker.C {
-		uuid := uuid()
-		reqh := payloadHeader(RequestPayload, uuid, time.Now().UnixNano(), -1)
+		uuid := proto.UUID()
+		reqh := proto.PayloadHeader(proto.RequestPayload, uuid, time.Now().UnixNano(), -1)
 		i.data <- append(reqh, []byte("GET / HTTP/1.1\r\nHost: www.w3.org\r\nUser-Agent: Go 1.1 package http\r\nAccept-Encoding: gzip\r\n\r\n")...)
 
-		resh := payloadHeader(ResponsePayload, uuid, time.Now().UnixNano()+1, 1)
+		resh := proto.PayloadHeader(proto.ResponsePayload, uuid, time.Now().UnixNano()+1, 1)
 		i.data <- append(resh, []byte("HTTP/1.1 200 OK\r\nContent-Length: 0\r\n\r\n")...)
 	}
 }
diff --git a/output_dummy.go b/pkg/dummy/output_dummy.go
similarity index 55%
rename from output_dummy.go
rename to pkg/dummy/output_dummy.go
index 32ab794c..73bc1b98 100644
--- a/output_dummy.go
+++ b/pkg/dummy/output_dummy.go
@@ -1,7 +1,10 @@
-package goreplay
+package dummy
 
 import (
 	"os"
+
+	"github.com/buger/goreplay/pkg/plugin"
+	"github.com/buger/goreplay/pkg/proto"
 )
 
 // DummyOutput used for debugging, prints all incoming requests
@@ -16,16 +19,15 @@ func NewDummyOutput() (di *DummyOutput) {
 }
 
 // PluginWrite writes message to this plugin
-func (i *DummyOutput) PluginWrite(msg *Message) (int, error) {
+func (i *DummyOutput) PluginWrite(msg *plugin.Message) (int, error) {
 	var n, nn int
-	var err error
-	n, err = os.Stdout.Write(msg.Meta)
-	nn, err = os.Stdout.Write(msg.Data)
+	n, _ = os.Stdout.Write(msg.Meta)
+	nn, _ = os.Stdout.Write(msg.Data)
 	n += nn
-	nn, err = os.Stdout.Write(payloadSeparatorAsBytes)
+	nn, _ = os.Stdout.Write(proto.PayloadSeparatorAsBytes)
 	n += nn
 
-	return n, err
+	return n, nil
 }
 
 func (i *DummyOutput) String() string {
diff --git a/elasticsearch.go b/pkg/elasticsearch/elasticsearch.go
similarity index 92%
rename from elasticsearch.go
rename to pkg/elasticsearch/elasticsearch.go
index e979a40f..e578d7b4 100644
--- a/elasticsearch.go
+++ b/pkg/elasticsearch/elasticsearch.go
@@ -1,16 +1,20 @@
-package goreplay
+package elasticsearch
 
 import (
 	"encoding/json"
-	"github.com/buger/goreplay/proto"
-	"log"
 	"net/url"
 	"strings"
 	"time"
 
+	proto "github.com/buger/goreplay/pkg/http_proto"
+
 	elastigo "github.com/mattbaird/elastigo/lib"
+
+	"github.com/rs/zerolog/log"
 )
 
+var logger = log.With().Str("component", "elasticsearch").Logger()
+
 type ESUriErorr struct{}
 
 func (e *ESUriErorr) Error() string {
@@ -87,7 +91,7 @@ func (p *ESPlugin) Init(URI string) {
 	err, p.Index = parseURI(URI)
 
 	if err != nil {
-		log.Fatal("Can't initialize ElasticSearch plugin.", err)
+		logger.Fatal().Err(err).Msg("Can't initialize ElasticSearch plugin.")
 	}
 
 	p.eConn = elastigo.NewConn()
@@ -100,7 +104,7 @@ func (p *ESPlugin) Init(URI string) {
 
 	go p.ErrorHandler()
 
-	Debug(1, "Initialized Elasticsearch Plugin")
+	logger.Info().Msg("Initialized Elasticsearch Plugin")
 	return
 }
 
@@ -112,7 +116,7 @@ func (p *ESPlugin) IndexerShutdown() {
 func (p *ESPlugin) ErrorHandler() {
 	for {
 		errBuf := <-p.indexor.ErrorChannel
-		Debug(1, "[ELASTICSEARCH]", errBuf.Err)
+		logger.Error().Err(errBuf.Err).Msg("Error indexing document")
 	}
 }
 
@@ -156,9 +160,10 @@ func (p *ESPlugin) ResponseAnalyze(req, resp []byte, start, stop time.Time) {
 		Rtt:                  rtt,
 		Timestamp:            t,
 	}
+
 	j, err := json.Marshal(&esResp)
 	if err != nil {
-		Debug(0, "[ELASTIC-RESPONSE]", err)
+		logger.Error().Err(err).Msg("Error marshaling ESRequestResponse")
 	} else {
 		p.indexor.Index(p.Index, "RequestResponse", "", "", "", &t, j)
 	}
diff --git a/elasticsearch_test.go b/pkg/elasticsearch/elasticsearch_test.go
similarity index 99%
rename from elasticsearch_test.go
rename to pkg/elasticsearch/elasticsearch_test.go
index 77b8c0e7..fab4ea78 100644
--- a/elasticsearch_test.go
+++ b/pkg/elasticsearch/elasticsearch_test.go
@@ -1,4 +1,4 @@
-package goreplay
+package elasticsearch
 
 import (
 	"testing"
diff --git a/pkg/emitter/emitter.go b/pkg/emitter/emitter.go
new file mode 100644
index 00000000..24f4de76
--- /dev/null
+++ b/pkg/emitter/emitter.go
@@ -0,0 +1,186 @@
+package emitter
+
+import (
+	"hash/fnv"
+	"io"
+	"sync"
+
+	"github.com/buger/goreplay/internal/byteutils"
+	"github.com/buger/goreplay/internal/size"
+	"github.com/buger/goreplay/pkg/http_modifier"
+	"github.com/buger/goreplay/pkg/middleware"
+	"github.com/buger/goreplay/pkg/plugin"
+	"github.com/buger/goreplay/pkg/prettify"
+	"github.com/buger/goreplay/pkg/pro"
+	"github.com/buger/goreplay/pkg/proto"
+
+	"github.com/coocood/freecache"
+	"github.com/rs/zerolog"
+	"github.com/rs/zerolog/log"
+)
+
+var logger = log.With().Str("component", "emitter").Logger()
+
+// Emitter represents an abject to manage plugins communication
+type Emitter struct {
+	sync.WaitGroup
+	plugins *plugin.InOutPlugins
+	config  *Config
+}
+
+// Config represents configuration for Emitter
+type Config struct {
+	CopyBufferSize       size.Size `json:"copy-buffer-size"`
+	Middleware           string    `json:"middleware"`
+	ModifierConfig       http_modifier.HTTPModifierConfig
+	PrettifyHTTP         bool `json:"prettify-http"`
+	SplitOutput          bool `json:"split-output"`
+	RecognizeTCPSessions bool `json:"recognize-tcp-sessions"`
+}
+
+// New creates and initializes new Emitter object.
+func New(configs ...*Config) *Emitter {
+	config := &Config{}
+	if len(configs) > 0 {
+		config = configs[0]
+	}
+
+	return &Emitter{
+		config: config,
+	}
+}
+
+// Start initialize loop for sending data from inputs to outputs
+func (e *Emitter) Start(plugins *plugin.InOutPlugins) {
+	if e.config.CopyBufferSize < 1 {
+		e.config.CopyBufferSize = 5 << 20
+	}
+	e.plugins = plugins
+
+	if e.config.Middleware != "" {
+		middleware := middleware.NewMiddleware(e.config.Middleware, nil)
+
+		for _, in := range plugins.Inputs {
+			middleware.ReadFrom(in)
+		}
+
+		e.plugins.Inputs = append(e.plugins.Inputs, middleware)
+		e.plugins.All = append(e.plugins.All, middleware)
+		e.Add(1)
+		go func() {
+			defer e.Done()
+			if err := e.CopyMulty(middleware, plugins.Outputs...); err != nil {
+				logger.Error().Err(err).Msg("error during copy")
+			}
+		}()
+	} else {
+		for _, in := range plugins.Inputs {
+			e.Add(1)
+			go func(in plugin.Reader) {
+				defer e.Done()
+				if err := e.CopyMulty(in, plugins.Outputs...); err != nil {
+					logger.Error().Err(err).Msg("error during copy")
+				}
+			}(in)
+		}
+	}
+}
+
+// Close closes all the goroutine and waits for it to finish.
+func (e *Emitter) Close() {
+	for _, p := range e.plugins.All {
+		if cp, ok := p.(io.Closer); ok {
+			cp.Close()
+		}
+	}
+	if len(e.plugins.All) > 0 {
+		// wait for everything to stop
+		e.Wait()
+	}
+	e.plugins.All = nil // avoid Close to make changes again
+}
+
+// CopyMulty copies from 1 reader to multiple writers
+func (e *Emitter) CopyMulty(src plugin.Reader, writers ...plugin.Writer) error {
+	wIndex := 0
+	modifier := http_modifier.NewHTTPModifier(&e.config.ModifierConfig)
+	filteredRequests := freecache.NewCache(200 * 1024 * 1024) // 200M
+
+	for {
+		msg, err := src.PluginRead()
+		if err != nil {
+			if err == plugin.ErrorStopped || err == io.EOF {
+				return nil
+			}
+			return err
+		}
+		if msg != nil && len(msg.Data) > 0 {
+			if len(msg.Data) > int(e.config.CopyBufferSize) {
+				msg.Data = msg.Data[:e.config.CopyBufferSize]
+			}
+			meta := proto.PayloadMeta(msg.Meta)
+			if len(meta) < 3 {
+				logger.Warn().Msgf("Found malformed record %q from %q", msg.Meta, src)
+				continue
+			}
+			requestID := meta[1]
+			// start a subroutine only when necessary
+			if log.Logger.GetLevel() == zerolog.DebugLevel {
+				logger.Debug().Msgf("input: %s from: %s", byteutils.SliceToString(msg.Meta[:len(msg.Meta)-1]), src)
+			}
+			if modifier != nil {
+				logger.Debug().Msgf("modifier: %s from: %s", requestID, src)
+				if proto.IsRequestPayload(msg.Meta) {
+					msg.Data = modifier.Rewrite(msg.Data)
+					// If modifier tells to skip request
+					if len(msg.Data) == 0 {
+						filteredRequests.Set(requestID, []byte{}, 60) //
+						continue
+					}
+					logger.Debug().Msgf("Rewritten input: %s from: %s", requestID, src)
+				} else {
+					_, err := filteredRequests.Get(requestID)
+					if err == nil {
+						filteredRequests.Del(requestID)
+						continue
+					}
+				}
+			}
+
+			if e.config.PrettifyHTTP {
+				msg.Data = prettify.PrettifyHTTP(msg.Data)
+				if len(msg.Data) == 0 {
+					continue
+				}
+			}
+
+			if e.config.SplitOutput {
+				if e.config.RecognizeTCPSessions {
+					if !pro.PRO {
+						logger.Fatal().Msg("Detailed TCP sessions work only with PRO license")
+					}
+					hasher := fnv.New32a()
+					hasher.Write(meta[1])
+
+					wIndex = int(hasher.Sum32()) % len(writers)
+					if _, err := writers[wIndex].PluginWrite(msg); err != nil {
+						return err
+					}
+				} else {
+					// Simple round robin
+					if _, err := writers[wIndex].PluginWrite(msg); err != nil {
+						return err
+					}
+
+					wIndex = (wIndex + 1) % len(writers)
+				}
+			} else {
+				for _, dst := range writers {
+					if _, err := dst.PluginWrite(msg); err != nil && err != io.ErrClosedPipe {
+						return err
+					}
+				}
+			}
+		}
+	}
+}
diff --git a/pkg/emitter/emitter_test.go b/pkg/emitter/emitter_test.go
new file mode 100644
index 00000000..af40d92e
--- /dev/null
+++ b/pkg/emitter/emitter_test.go
@@ -0,0 +1,344 @@
+package emitter
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"os"
+	"os/exec"
+	"strings"
+	"sync"
+	"sync/atomic"
+	"syscall"
+	"testing"
+	"time"
+
+	"github.com/buger/goreplay/pkg/http_modifier"
+	"github.com/buger/goreplay/pkg/middleware"
+	"github.com/buger/goreplay/pkg/plugin"
+	"github.com/buger/goreplay/pkg/pro"
+	"github.com/buger/goreplay/pkg/proto"
+	"github.com/buger/goreplay/pkg/test"
+)
+
+func TestMain(m *testing.M) {
+	pro.Enable()
+	code := m.Run()
+	os.Exit(code)
+}
+
+func TestEmitter(t *testing.T) {
+	wg := new(sync.WaitGroup)
+
+	input := test.NewTestInput()
+	output := test.NewTestOutput(func(*plugin.Message) {
+		wg.Done()
+	})
+
+	plugins := &plugin.InOutPlugins{
+		Inputs:  []plugin.Reader{input},
+		Outputs: []plugin.Writer{output},
+	}
+	plugins.All = append(plugins.All, input, output)
+
+	emitter := New()
+	go emitter.Start(plugins)
+
+	for i := 0; i < 1000; i++ {
+		wg.Add(1)
+		input.EmitGET()
+	}
+
+	wg.Wait()
+	emitter.Close()
+}
+
+func TestEmitterFiltered(t *testing.T) {
+	wg := new(sync.WaitGroup)
+
+	input := test.NewTestInput()
+	input.SkipHeader = true
+
+	output := test.NewTestOutput(func(*plugin.Message) {
+		wg.Done()
+	})
+
+	plugins := &plugin.InOutPlugins{
+		Inputs:  []plugin.Reader{input},
+		Outputs: []plugin.Writer{output},
+	}
+	plugins.All = append(plugins.All, input, output)
+
+	methods := http_modifier.HTTPMethods{[]byte("GET")}
+	emitter := New(&Config{
+		ModifierConfig: http_modifier.HTTPModifierConfig{Methods: methods},
+	})
+	go emitter.Start(plugins)
+
+	wg.Add(2)
+
+	id := proto.UUID()
+	reqh := proto.PayloadHeader(proto.RequestPayload, id, time.Now().UnixNano(), -1)
+	reqb := append(reqh, []byte("POST / HTTP/1.1\r\nHost: www.w3.org\r\nUser-Agent: Go 1.1 package http\r\nAccept-Encoding: gzip\r\n\r\n")...)
+
+	resh := proto.PayloadHeader(proto.ResponsePayload, id, time.Now().UnixNano()+1, 1)
+	respb := append(resh, []byte("HTTP/1.1 200 OK\r\nContent-Length: 0\r\n\r\n")...)
+
+	input.EmitBytes(reqb)
+	input.EmitBytes(respb)
+
+	id = proto.UUID()
+	reqh = proto.PayloadHeader(proto.RequestPayload, id, time.Now().UnixNano(), -1)
+	reqb = append(reqh, []byte("GET / HTTP/1.1\r\nHost: www.w3.org\r\nUser-Agent: Go 1.1 package http\r\nAccept-Encoding: gzip\r\n\r\n")...)
+
+	resh = proto.PayloadHeader(proto.ResponsePayload, id, time.Now().UnixNano()+1, 1)
+	respb = append(resh, []byte("HTTP/1.1 200 OK\r\nContent-Length: 0\r\n\r\n")...)
+
+	input.EmitBytes(reqb)
+	input.EmitBytes(respb)
+
+	wg.Wait()
+	emitter.Close()
+}
+
+func TestEmitterSplitRoundRobin(t *testing.T) {
+	wg := new(sync.WaitGroup)
+
+	input := test.NewTestInput()
+
+	var counter1, counter2 int32
+
+	output1 := test.NewTestOutput(func(*plugin.Message) {
+		atomic.AddInt32(&counter1, 1)
+		wg.Done()
+	})
+
+	output2 := test.NewTestOutput(func(*plugin.Message) {
+		atomic.AddInt32(&counter2, 1)
+		wg.Done()
+	})
+
+	plugins := &plugin.InOutPlugins{
+		Inputs:  []plugin.Reader{input},
+		Outputs: []plugin.Writer{output1, output2},
+	}
+
+	emitter := New(&Config{
+		SplitOutput: true,
+	})
+	go emitter.Start(plugins)
+
+	for i := 0; i < 1000; i++ {
+		wg.Add(1)
+		input.EmitGET()
+	}
+
+	wg.Wait()
+
+	emitter.Close()
+
+	if counter1 == 0 || counter2 == 0 || counter1 != counter2 {
+		t.Errorf("Round robin should split traffic equally: %d vs %d", counter1, counter2)
+	}
+}
+
+func TestEmitterRoundRobin(t *testing.T) {
+	wg := new(sync.WaitGroup)
+
+	input := test.NewTestInput()
+
+	var counter1, counter2 int32
+
+	output1 := test.NewTestOutput(func(*plugin.Message) {
+		counter1++
+		wg.Done()
+	})
+
+	output2 := test.NewTestOutput(func(*plugin.Message) {
+		counter2++
+		wg.Done()
+	})
+
+	plugins := &plugin.InOutPlugins{
+		Inputs:  []plugin.Reader{input},
+		Outputs: []plugin.Writer{output1, output2},
+	}
+	plugins.All = append(plugins.All, input, output1, output2)
+
+	emitter := New(&Config{
+		SplitOutput: true,
+	})
+	go emitter.Start(plugins)
+
+	for i := 0; i < 1000; i++ {
+		wg.Add(1)
+		input.EmitGET()
+	}
+
+	wg.Wait()
+	emitter.Close()
+
+	if counter1 == 0 || counter2 == 0 {
+		t.Errorf("Round robin should split traffic equally: %d vs %d", counter1, counter2)
+	}
+}
+
+func TestEmitterSplitSession(t *testing.T) {
+	wg := new(sync.WaitGroup)
+	wg.Add(200)
+
+	input := test.NewTestInput()
+	input.SkipHeader = true
+
+	var counter1, counter2 int32
+
+	output1 := test.NewTestOutput(func(msg *plugin.Message) {
+		if proto.PayloadID(msg.Meta)[0] == 'a' {
+			counter1++
+		}
+		wg.Done()
+	})
+
+	output2 := test.NewTestOutput(func(msg *plugin.Message) {
+		if proto.PayloadID(msg.Meta)[0] == 'b' {
+			counter2++
+		}
+		wg.Done()
+	})
+
+	plugins := &plugin.InOutPlugins{
+		Inputs:  []plugin.Reader{input},
+		Outputs: []plugin.Writer{output1, output2},
+	}
+
+	emitter := New(&Config{
+		SplitOutput:          true,
+		RecognizeTCPSessions: true,
+	})
+	go emitter.Start(plugins)
+
+	for i := 0; i < 200; i++ {
+		// Keep session but randomize
+		id := make([]byte, 20)
+		if i&1 == 0 { // for recognizeTCPSessions one should be odd and other will be even number
+			id[0] = 'a'
+		} else {
+			id[0] = 'b'
+		}
+		input.EmitBytes([]byte(fmt.Sprintf("1 %s 1 1\nGET / HTTP/1.1\r\n\r\n", id[:20])))
+	}
+
+	wg.Wait()
+
+	if counter1 != counter2 {
+		t.Errorf("Round robin should split traffic equally: %d vs %d", counter1, counter2)
+	}
+
+	emitter.Close()
+}
+
+func BenchmarkEmitter(b *testing.B) {
+	wg := new(sync.WaitGroup)
+
+	input := test.NewTestInput()
+
+	output := test.NewTestOutput(func(*plugin.Message) {
+		wg.Done()
+	})
+
+	plugins := &plugin.InOutPlugins{
+		Inputs:  []plugin.Reader{input},
+		Outputs: []plugin.Writer{output},
+	}
+	plugins.All = append(plugins.All, input, output)
+
+	emitter := New(&Config{})
+	go emitter.Start(plugins)
+
+	b.ResetTimer()
+
+	for i := 0; i < b.N; i++ {
+		wg.Add(1)
+		input.EmitGET()
+	}
+
+	wg.Wait()
+	emitter.Close()
+}
+
+const echoSh = "./examples/middleware/echo.sh"
+const tokenModifier = "go run ./examples/middleware/token_modifier.go"
+
+var withDebug = append(syscall.Environ(), "GOR_TEST=1")
+
+func initMiddleware(cmd *exec.Cmd, cancl context.CancelFunc, l plugin.Reader, c func(error)) *middleware.Middleware {
+	var m middleware.Middleware
+	m.Data = make(chan *plugin.Message, 1000)
+	m.Stop = make(chan bool)
+	m.CommandCancel = cancl
+	m.Stdout, _ = cmd.StdoutPipe()
+	m.Stdin, _ = cmd.StdinPipe()
+	cmd.Stderr = os.Stderr
+	go m.Read(m.Stdout)
+	go func() {
+		defer m.Close()
+		var err error
+		if err = cmd.Start(); err == nil {
+			err = cmd.Wait()
+		}
+		if err != nil {
+			c(err)
+		}
+	}()
+	m.ReadFrom(l)
+	return &m
+}
+
+func initCmd(command string, env []string) (*exec.Cmd, context.CancelFunc) {
+	commands := strings.Split(command, " ")
+	ctx, cancl := context.WithCancel(context.Background())
+	cmd := exec.CommandContext(ctx, commands[0], commands[1:]...)
+	cmd.Env = env
+	return cmd, cancl
+}
+
+func TestMiddlewareEarlyClose(t *testing.T) {
+	t.Skip()
+	quit := make(chan struct{})
+	in := test.NewTestInput()
+	cmd, cancl := initCmd(echoSh, withDebug)
+	midd := initMiddleware(cmd, cancl, in, func(err error) {
+		if err != nil {
+			if e, ok := err.(*exec.ExitError); ok {
+				status := e.Sys().(syscall.WaitStatus)
+				if status.Signal() != syscall.SIGKILL {
+					t.Errorf("expected error to be signal killed. got %s", status.Signal().String())
+				}
+			}
+		}
+		quit <- struct{}{}
+	})
+	var body = []byte("OPTIONS / HTTP/1.1\r\nHost: example.org\r\n\r\n")
+	count := uint32(0)
+	out := test.NewTestOutput(func(msg *plugin.Message) {
+		if !bytes.Equal(body, msg.Data) {
+			t.Errorf("expected %q to equal %q", body, msg.Data)
+		}
+		atomic.AddUint32(&count, 1)
+		if atomic.LoadUint32(&count) == 5 {
+			quit <- struct{}{}
+		}
+	})
+	pl := &plugin.InOutPlugins{}
+	pl.Inputs = []plugin.Reader{midd, in}
+	pl.Outputs = []plugin.Writer{out}
+	pl.All = []interface{}{midd, out, in}
+	e := New()
+	go e.Start(pl)
+	for i := 0; i < 5; i++ {
+		in.EmitBytes(body)
+	}
+	<-quit
+	midd.Close()
+	<-quit
+}
diff --git a/input_file.go b/pkg/file/input_file.go
similarity index 83%
rename from input_file.go
rename to pkg/file/input_file.go
index feaf479d..735224c6 100644
--- a/input_file.go
+++ b/pkg/file/input_file.go
@@ -1,4 +1,4 @@
-package goreplay
+package file
 
 import (
 	"bufio"
@@ -21,8 +21,22 @@ import (
 	"github.com/aws/aws-sdk-go/aws"
 	"github.com/aws/aws-sdk-go/aws/session"
 	"github.com/aws/aws-sdk-go/service/s3"
+	"github.com/buger/goreplay/pkg/plugin"
+	"github.com/buger/goreplay/pkg/proto"
+
+	"github.com/rs/zerolog/log"
 )
 
+var inputLogger = log.With().Str("component", "input_file").Logger()
+
+// InputFileConfig contains config of input file
+type InputFileConfig struct {
+	InputFileLoop      bool          `json:"input-file-loop"`
+	InputFileReadDepth int           `json:"input-file-read-depth"`
+	InputFileDryRun    bool          `json:"input-file-dry-run"`
+	InputFileMaxWait   time.Duration `json:"input-file-max-wait"`
+}
+
 type filePayload struct {
 	data      []byte
 	timestamp int64
@@ -68,7 +82,7 @@ type fileInputReader struct {
 }
 
 func (f *fileInputReader) parse(init chan struct{}) error {
-	payloadSeparatorAsBytes := []byte(payloadSeparator)
+	payloadSeparatorAsBytes := []byte(proto.PayloadSeparator)
 	var buffer bytes.Buffer
 	var initialized bool
 
@@ -80,7 +94,7 @@ func (f *fileInputReader) parse(init chan struct{}) error {
 
 		if err != nil {
 			if err != io.EOF {
-				Debug(1, err)
+				inputLogger.Error().Err(err).Msg("Error reading file")
 			}
 
 			f.Close()
@@ -95,10 +109,10 @@ func (f *fileInputReader) parse(init chan struct{}) error {
 
 		if bytes.Equal(payloadSeparatorAsBytes[1:], line) {
 			asBytes := buffer.Bytes()
-			meta := payloadMeta(asBytes)
+			meta := proto.PayloadMeta(asBytes)
 
 			if len(meta) < 3 {
-				Debug(1, fmt.Sprintf("Found malformed record, file: %s, line %d", f.path, lineNum))
+				inputLogger.Warn().Msgf("Found malformed record, file: %s, line %d", f.path, lineNum)
 				buffer = bytes.Buffer{}
 				continue
 			}
@@ -175,7 +189,7 @@ func newFileInputReader(path string, readDepth int, dryRun bool) *fileInputReade
 	}
 
 	if err != nil {
-		Debug(0, fmt.Sprintf("[INPUT-FILE] err: %q", err))
+		inputLogger.Error().Err(err).Msg("Error opening file")
 		return nil
 	}
 
@@ -183,7 +197,7 @@ func newFileInputReader(path string, readDepth int, dryRun bool) *fileInputReade
 	if strings.HasSuffix(path, ".gz") {
 		gzReader, err := gzip.NewReader(file)
 		if err != nil {
-			Debug(0, fmt.Sprintf("[INPUT-FILE] err: %q", err))
+			inputLogger.Error().Err(err).Msg("Error opening compressed file")
 			return nil
 		}
 		r.reader = bufio.NewReader(gzReader)
@@ -257,7 +271,7 @@ func (i *FileInput) init() (err error) {
 
 		resp, err := svc.ListObjects(params)
 		if err != nil {
-			Debug(2, "[INPUT-FILE] Error while retrieving list of files from S3", i.path, err)
+			inputLogger.Error().Err(err).Msgf("Error while retrieving list of files from S3: %s", i.path)
 			return err
 		}
 
@@ -265,12 +279,12 @@ func (i *FileInput) init() (err error) {
 			matches = append(matches, "s3://"+bucket+"/"+(*c.Key))
 		}
 	} else if matches, err = filepath.Glob(i.path); err != nil {
-		Debug(2, "[INPUT-FILE] Wrong file pattern", i.path, err)
+		inputLogger.Error().Err(err).Msgf("Error while retrieving list of files: %s", i.path)
 		return
 	}
 
 	if len(matches) == 0 {
-		Debug(2, "[INPUT-FILE] No files match pattern: ", i.path)
+		inputLogger.Error().Msgf("No files match pattern: %s", i.path)
 		return errors.New("no matching files")
 	}
 
@@ -285,15 +299,25 @@ func (i *FileInput) init() (err error) {
 	return nil
 }
 
+// Limited enabled custom logic for file input
+func (i *FileInput) Limited() bool {
+	return false
+}
+
+// SetLimit sets limit for this plugin
+func (i *FileInput) SetLimit(limit float64) {
+	i.speedFactor = limit
+}
+
 // PluginRead reads message from this plugin
-func (i *FileInput) PluginRead() (*Message, error) {
-	var msg Message
+func (i *FileInput) PluginRead() (*plugin.Message, error) {
+	var msg plugin.Message
 	select {
 	case <-i.exit:
-		return nil, ErrorStopped
+		return nil, plugin.ErrorStopped
 	case buf := <-i.data:
 		i.stats.Add("read_from", 1)
-		msg.Meta, msg.Data = payloadMetaWithBody(buf)
+		msg.Meta, msg.Data = proto.PayloadMetaWithBody(buf)
 		return &msg, nil
 	}
 }
@@ -410,7 +434,7 @@ func (i *FileInput) emit() {
 	i.stats.Set("max_wait", time.Duration(maxWait))
 	i.stats.Set("min_wait", time.Duration(minWait))
 
-	Debug(2, fmt.Sprintf("[INPUT-FILE] FileInput: end of file '%s'\n", i.path))
+	inputLogger.Info().Msgf("FileInput: end of file '%s'", i.path)
 
 	if i.dryRun {
 		fmt.Printf("Records found: %v\nFiles processed: %v\nBytes processed: %v\nMax wait: %v\nMin wait: %v\nFirst wait: %v\nIt will take `%v` to replay at current speed.\nFound %v records with out of order timestamp\n",
diff --git a/input_file_test.go b/pkg/file/input_file_test.go
similarity index 75%
rename from input_file_test.go
rename to pkg/file/input_file_test.go
index 59d057e1..53f0fd77 100644
--- a/input_file_test.go
+++ b/pkg/file/input_file_test.go
@@ -1,4 +1,4 @@
-package goreplay
+package file
 
 import (
 	"bytes"
@@ -10,19 +10,24 @@ import (
 	"sync"
 	"testing"
 	"time"
+
+	"github.com/buger/goreplay/pkg/emitter"
+	"github.com/buger/goreplay/pkg/plugin"
+	"github.com/buger/goreplay/pkg/proto"
+	"github.com/buger/goreplay/pkg/test"
 )
 
 func TestInputFileWithGET(t *testing.T) {
-	input := NewTestInput()
-	rg := NewRequestGenerator([]PluginReader{input}, func() { input.EmitGET() }, 1)
-	readPayloads := []*Message{}
+	input := test.NewTestInput()
+	rg := NewRequestGenerator([]plugin.Reader{input}, func() { input.EmitGET() }, 1)
+	readPayloads := []*plugin.Message{}
 
 	// Given a capture file with a GET request
 	expectedCaptureFile := CreateCaptureFile(rg)
 	defer expectedCaptureFile.TearDown()
 
 	// When the request is read from the capture file
-	err := ReadFromCaptureFile(expectedCaptureFile.file, 1, func(msg *Message) {
+	err := ReadFromCaptureFile(expectedCaptureFile.file, 1, func(msg *plugin.Message) {
 		readPayloads = append(readPayloads, msg)
 	})
 
@@ -36,16 +41,16 @@ func TestInputFileWithGET(t *testing.T) {
 }
 
 func TestInputFileWithPayloadLargerThan64Kb(t *testing.T) {
-	input := NewTestInput()
-	rg := NewRequestGenerator([]PluginReader{input}, func() { input.EmitSizedPOST(64 * 1024) }, 1)
-	readPayloads := []*Message{}
+	input := test.NewTestInput()
+	rg := NewRequestGenerator([]plugin.Reader{input}, func() { input.EmitSizedPOST(64 * 1024) }, 1)
+	readPayloads := []*plugin.Message{}
 
 	// Given a capture file with a request over 64Kb
 	expectedCaptureFile := CreateCaptureFile(rg)
 	defer expectedCaptureFile.TearDown()
 
 	// When the request is read from the capture file
-	err := ReadFromCaptureFile(expectedCaptureFile.file, 1, func(msg *Message) {
+	err := ReadFromCaptureFile(expectedCaptureFile.file, 1, func(msg *plugin.Message) {
 		readPayloads = append(readPayloads, msg)
 	})
 
@@ -61,19 +66,19 @@ func TestInputFileWithPayloadLargerThan64Kb(t *testing.T) {
 
 func TestInputFileWithGETAndPOST(t *testing.T) {
 
-	input := NewTestInput()
-	rg := NewRequestGenerator([]PluginReader{input}, func() {
+	input := test.NewTestInput()
+	rg := NewRequestGenerator([]plugin.Reader{input}, func() {
 		input.EmitGET()
 		input.EmitPOST()
 	}, 2)
-	readPayloads := []*Message{}
+	readPayloads := []*plugin.Message{}
 
 	// Given a capture file with a GET request
 	expectedCaptureFile := CreateCaptureFile(rg)
 	defer expectedCaptureFile.TearDown()
 
 	// When the requests are read from the capture file
-	err := ReadFromCaptureFile(expectedCaptureFile.file, 2, func(msg *Message) {
+	err := ReadFromCaptureFile(expectedCaptureFile.file, 2, func(msg *plugin.Message) {
 		readPayloads = append(readPayloads, msg)
 	})
 
@@ -92,16 +97,16 @@ func TestInputFileMultipleFilesWithRequestsOnly(t *testing.T) {
 
 	file1, _ := os.OpenFile(fmt.Sprintf("/tmp/%d_0", rnd), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0660)
 	file1.Write([]byte("1 1 1\ntest1"))
-	file1.Write([]byte(payloadSeparator))
+	file1.Write([]byte(proto.PayloadSeparator))
 	file1.Write([]byte("1 1 3\ntest2"))
-	file1.Write([]byte(payloadSeparator))
+	file1.Write([]byte(proto.PayloadSeparator))
 	file1.Close()
 
 	file2, _ := os.OpenFile(fmt.Sprintf("/tmp/%d_1", rnd), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0660)
 	file2.Write([]byte("1 1 2\ntest3"))
-	file2.Write([]byte(payloadSeparator))
+	file2.Write([]byte(proto.PayloadSeparator))
 	file2.Write([]byte("1 1 4\ntest4"))
-	file2.Write([]byte(payloadSeparator))
+	file2.Write([]byte(proto.PayloadSeparator))
 	file2.Close()
 
 	input := NewFileInput(fmt.Sprintf("/tmp/%d*", rnd), false, 100, 0, false)
@@ -124,11 +129,11 @@ func TestInputFileRequestsWithLatency(t *testing.T) {
 	defer file.Close()
 
 	file.Write([]byte("1 1 100000000\nrequest1"))
-	file.Write([]byte(payloadSeparator))
+	file.Write([]byte(proto.PayloadSeparator))
 	file.Write([]byte("1 2 150000000\nrequest2"))
-	file.Write([]byte(payloadSeparator))
+	file.Write([]byte(proto.PayloadSeparator))
 	file.Write([]byte("1 3 250000000\nrequest3"))
-	file.Write([]byte(payloadSeparator))
+	file.Write([]byte(proto.PayloadSeparator))
 
 	input := NewFileInput(fmt.Sprintf("/tmp/%d", rnd), false, 100, 0, false)
 
@@ -150,24 +155,24 @@ func TestInputFileMultipleFilesWithRequestsAndResponses(t *testing.T) {
 
 	file1, _ := os.OpenFile(fmt.Sprintf("/tmp/%d_0", rnd), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0660)
 	file1.Write([]byte("1 1 1\nrequest1"))
-	file1.Write([]byte(payloadSeparator))
+	file1.Write([]byte(proto.PayloadSeparator))
 	file1.Write([]byte("2 1 1\nresponse1"))
-	file1.Write([]byte(payloadSeparator))
+	file1.Write([]byte(proto.PayloadSeparator))
 	file1.Write([]byte("1 2 3\nrequest2"))
-	file1.Write([]byte(payloadSeparator))
+	file1.Write([]byte(proto.PayloadSeparator))
 	file1.Write([]byte("2 2 3\nresponse2"))
-	file1.Write([]byte(payloadSeparator))
+	file1.Write([]byte(proto.PayloadSeparator))
 	file1.Close()
 
 	file2, _ := os.OpenFile(fmt.Sprintf("/tmp/%d_1", rnd), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0660)
 	file2.Write([]byte("1 3 2\nrequest3"))
-	file2.Write([]byte(payloadSeparator))
+	file2.Write([]byte(proto.PayloadSeparator))
 	file2.Write([]byte("2 3 2\nresponse3"))
-	file2.Write([]byte(payloadSeparator))
+	file2.Write([]byte(proto.PayloadSeparator))
 	file2.Write([]byte("1 4 4\nrequest4"))
-	file2.Write([]byte(payloadSeparator))
+	file2.Write([]byte(proto.PayloadSeparator))
 	file2.Write([]byte("2 4 4\nresponse4"))
-	file2.Write([]byte(payloadSeparator))
+	file2.Write([]byte(proto.PayloadSeparator))
 	file2.Close()
 
 	input := NewFileInput(fmt.Sprintf("/tmp/%d*", rnd), false, 100, 0, false)
@@ -193,9 +198,9 @@ func TestInputFileLoop(t *testing.T) {
 
 	file, _ := os.OpenFile(fmt.Sprintf("/tmp/%d", rnd), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0660)
 	file.Write([]byte("1 1 1\ntest1"))
-	file.Write([]byte(payloadSeparator))
+	file.Write([]byte(proto.PayloadSeparator))
 	file.Write([]byte("1 1 2\ntest2"))
-	file.Write([]byte(payloadSeparator))
+	file.Write([]byte(proto.PayloadSeparator))
 	file.Close()
 
 	input := NewFileInput(fmt.Sprintf("/tmp/%d", rnd), true, 100, 0, false)
@@ -214,14 +219,14 @@ func TestInputFileCompressed(t *testing.T) {
 
 	output := NewFileOutput(fmt.Sprintf("/tmp/%d_0.gz", rnd), &FileOutputConfig{FlushInterval: time.Minute, Append: true})
 	for i := 0; i < 1000; i++ {
-		output.PluginWrite(&Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
+		output.PluginWrite(&plugin.Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
 	}
 	name1 := output.file.Name()
 	output.Close()
 
 	output2 := NewFileOutput(fmt.Sprintf("/tmp/%d_1.gz", rnd), &FileOutputConfig{FlushInterval: time.Minute, Append: true})
 	for i := 0; i < 1000; i++ {
-		output2.PluginWrite(&Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
+		output2.PluginWrite(&plugin.Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
 	}
 	name2 := output2.file.Name()
 	output2.Close()
@@ -236,11 +241,11 @@ func TestInputFileCompressed(t *testing.T) {
 }
 
 type CaptureFile struct {
-	msgs []*Message
+	msgs []*plugin.Message
 	file *os.File
 }
 
-func NewExpectedCaptureFile(msgs []*Message, file *os.File) *CaptureFile {
+func NewExpectedCaptureFile(msgs []*plugin.Message, file *os.File) *CaptureFile {
 	ecf := new(CaptureFile)
 	ecf.file = file
 	ecf.msgs = msgs
@@ -254,12 +259,12 @@ func (expectedCaptureFile *CaptureFile) TearDown() {
 }
 
 type RequestGenerator struct {
-	inputs []PluginReader
+	inputs []plugin.Reader
 	emit   func()
 	wg     *sync.WaitGroup
 }
 
-func NewRequestGenerator(inputs []PluginReader, emit func(), count int) (rg *RequestGenerator) {
+func NewRequestGenerator(inputs []plugin.Reader, emit func(), count int) (rg *RequestGenerator) {
 	rg = new(RequestGenerator)
 	rg.inputs = inputs
 	rg.emit = emit
@@ -268,7 +273,7 @@ func NewRequestGenerator(inputs []PluginReader, emit func(), count int) (rg *Req
 	return
 }
 
-func (expectedCaptureFile *CaptureFile) PayloadsEqual(other []*Message) bool {
+func (expectedCaptureFile *CaptureFile) PayloadsEqual(other []*plugin.Message) bool {
 
 	if len(expectedCaptureFile.msgs) != len(other) {
 		return false
@@ -293,25 +298,25 @@ func CreateCaptureFile(requestGenerator *RequestGenerator) *CaptureFile {
 		panic(err)
 	}
 
-	readPayloads := []*Message{}
-	output := NewTestOutput(func(msg *Message) {
+	readPayloads := []*plugin.Message{}
+	output := test.NewTestOutput(func(msg *plugin.Message) {
 		readPayloads = append(readPayloads, msg)
 		requestGenerator.wg.Done()
 	})
 
 	outputFile := NewFileOutput(f.Name(), &FileOutputConfig{FlushInterval: time.Second, Append: true})
 
-	plugins := &InOutPlugins{
+	plugins := &plugin.InOutPlugins{
 		Inputs:  requestGenerator.inputs,
-		Outputs: []PluginWriter{output, outputFile},
+		Outputs: []plugin.Writer{output, outputFile},
 	}
 	for _, input := range requestGenerator.inputs {
 		plugins.All = append(plugins.All, input)
 	}
 	plugins.All = append(plugins.All, output, outputFile)
 
-	emitter := NewEmitter()
-	go emitter.Start(plugins, Settings.Middleware)
+	emitter := emitter.New()
+	go emitter.Start(plugins)
 
 	requestGenerator.emit()
 	requestGenerator.wg.Wait()
@@ -323,24 +328,24 @@ func CreateCaptureFile(requestGenerator *RequestGenerator) *CaptureFile {
 
 }
 
-func ReadFromCaptureFile(captureFile *os.File, count int, callback writeCallback) (err error) {
+func ReadFromCaptureFile(captureFile *os.File, count int, callback test.WriteCallback) (err error) {
 	wg := new(sync.WaitGroup)
 
 	input := NewFileInput(captureFile.Name(), false, 100, 0, false)
-	output := NewTestOutput(func(msg *Message) {
+	output := test.NewTestOutput(func(msg *plugin.Message) {
 		callback(msg)
 		wg.Done()
 	})
 
-	plugins := &InOutPlugins{
-		Inputs:  []PluginReader{input},
-		Outputs: []PluginWriter{output},
+	plugins := &plugin.InOutPlugins{
+		Inputs:  []plugin.Reader{input},
+		Outputs: []plugin.Writer{output},
 	}
 	plugins.All = append(plugins.All, input, output)
 
 	wg.Add(count)
-	emitter := NewEmitter()
-	go emitter.Start(plugins, Settings.Middleware)
+	emitter := emitter.New()
+	go emitter.Start(plugins)
 
 	done := make(chan int, 1)
 	go func() {
diff --git a/output_file.go b/pkg/file/output_file.go
similarity index 88%
rename from output_file.go
rename to pkg/file/output_file.go
index 4b5a0401..3c433da8 100644
--- a/output_file.go
+++ b/pkg/file/output_file.go
@@ -1,24 +1,28 @@
-package goreplay
+package file
 
 import (
 	"bufio"
 	"compress/gzip"
 	"errors"
 	"fmt"
-	"github.com/buger/goreplay/internal/size"
 	"io"
-	"log"
 	"math/rand"
 	"os"
 	"path/filepath"
-	"runtime/debug"
 	"sort"
 	"strconv"
 	"strings"
 	"sync"
 	"time"
+
+	"github.com/buger/goreplay/internal/size"
+	"github.com/buger/goreplay/pkg/plugin"
+	"github.com/buger/goreplay/pkg/proto"
+
+	"github.com/rs/zerolog/log"
 )
 
+var outputLogger = log.With().Str("component", "output_file").Logger()
 var letters = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
 var instanceID string
 
@@ -103,7 +107,8 @@ func NewFileOutput(pathTemplate string, config *FileOutputConfig) *FileOutput {
 	return o
 }
 
-func getFileIndex(name string) int {
+// GetFileIndex returns index of file
+func GetFileIndex(name string) int {
 	ext := filepath.Ext(name)
 	withoutExt := strings.TrimSuffix(name, ext)
 
@@ -150,7 +155,7 @@ func (s sortByFileIndex) Swap(i, j int) {
 
 func (s sortByFileIndex) Less(i, j int) bool {
 	if withoutIndex(s[i]) == withoutIndex(s[j]) {
-		return getFileIndex(s[i]) < getFileIndex(s[j])
+		return GetFileIndex(s[i]) < GetFileIndex(s[j])
 	}
 
 	return s[i] < s[j]
@@ -187,7 +192,7 @@ func (o *FileOutput) filename() string {
 			last := matches[len(matches)-1]
 
 			fileIndex := 0
-			if idx := getFileIndex(last); idx != -1 {
+			if idx := GetFileIndex(last); idx != -1 {
 				fileIndex = idx
 
 				if nextChunk {
@@ -210,10 +215,10 @@ func (o *FileOutput) updateName() {
 }
 
 // PluginWrite writes message to this plugin
-func (o *FileOutput) PluginWrite(msg *Message) (n int, err error) {
+func (o *FileOutput) PluginWrite(msg *plugin.Message) (n int, err error) {
 	if o.requestPerFile {
 		o.Lock()
-		meta := payloadMeta(msg.Meta)
+		meta := proto.PayloadMeta(msg.Meta)
 		o.currentID = meta[1]
 		o.payloadType = meta[0]
 		o.Unlock()
@@ -236,7 +241,7 @@ func (o *FileOutput) PluginWrite(msg *Message) (n int, err error) {
 		}
 
 		if err != nil {
-			log.Fatal(o, "Cannot open file %q. Error: %s", o.currentName, err)
+			outputLogger.Fatal().Err(err).Str("file", o.currentName).Msg("Cannot open file")
 		}
 
 		o.QueueLength = 0
@@ -246,14 +251,14 @@ func (o *FileOutput) PluginWrite(msg *Message) (n int, err error) {
 	n, err = o.writer.Write(msg.Meta)
 	nn, err = o.writer.Write(msg.Data)
 	n += nn
-	nn, err = o.writer.Write(payloadSeparatorAsBytes)
+	nn, err = o.writer.Write(proto.PayloadSeparatorAsBytes)
 	n += nn
 
 	o.totalFileSize += size.Size(n)
 	o.currentFileSize += n
 	o.QueueLength++
 
-	if Settings.OutputFileConfig.OutputFileMaxSize > 0 && o.totalFileSize >= Settings.OutputFileConfig.OutputFileMaxSize {
+	if o.config.OutputFileMaxSize > 0 && o.totalFileSize >= o.config.OutputFileMaxSize {
 		return n, errors.New("File output reached size limit")
 	}
 
@@ -264,7 +269,7 @@ func (o *FileOutput) flush() {
 	// Don't exit on panic
 	defer func() {
 		if r := recover(); r != nil {
-			Debug(0, "[OUTPUT-FILE] PANIC while file flush: ", r, o, string(debug.Stack()))
+			outputLogger.Error().Stack().Msgf("PANIC while file flush: %v", r)
 		}
 	}()
 
@@ -281,7 +286,7 @@ func (o *FileOutput) flush() {
 		if stat, err := o.file.Stat(); err == nil {
 			o.currentFileSize = int(stat.Size())
 		} else {
-			Debug(0, "[OUTPUT-HTTP] error accessing file size", err)
+			outputLogger.Error().Err(err).Msgf("Error accessing file size")
 		}
 	}
 }
diff --git a/output_file_test.go b/pkg/file/output_file_test.go
similarity index 74%
rename from output_file_test.go
rename to pkg/file/output_file_test.go
index 65d0cf7c..9e7a0e44 100644
--- a/output_file_test.go
+++ b/pkg/file/output_file_test.go
@@ -1,8 +1,7 @@
-package goreplay
+package file
 
 import (
 	"fmt"
-	"github.com/buger/goreplay/internal/size"
 	"math/rand"
 	"os"
 	"reflect"
@@ -11,22 +10,28 @@ import (
 	"sync/atomic"
 	"testing"
 	"time"
+
+	"github.com/buger/goreplay/internal/size"
+	"github.com/buger/goreplay/pkg/emitter"
+	"github.com/buger/goreplay/pkg/plugin"
+	"github.com/buger/goreplay/pkg/proto"
+	"github.com/buger/goreplay/pkg/test"
 )
 
 func TestFileOutput(t *testing.T) {
 	wg := new(sync.WaitGroup)
 
-	input := NewTestInput()
+	input := test.NewTestInput()
 	output := NewFileOutput("/tmp/test_requests.gor", &FileOutputConfig{FlushInterval: time.Minute, Append: true})
 
-	plugins := &InOutPlugins{
-		Inputs:  []PluginReader{input},
-		Outputs: []PluginWriter{output},
+	plugins := &plugin.InOutPlugins{
+		Inputs:  []plugin.Reader{input},
+		Outputs: []plugin.Writer{output},
 	}
 	plugins.All = append(plugins.All, input, output)
 
-	emitter := NewEmitter()
-	go emitter.Start(plugins, Settings.Middleware)
+	em := emitter.New()
+	go em.Start(plugins)
 
 	for i := 0; i < 100; i++ {
 		wg.Add(2)
@@ -35,26 +40,26 @@ func TestFileOutput(t *testing.T) {
 	}
 	time.Sleep(100 * time.Millisecond)
 	output.flush()
-	emitter.Close()
+	em.Close()
 
 	var counter int64
 	input2 := NewFileInput("/tmp/test_requests.gor", false, 100, 0, false)
-	output2 := NewTestOutput(func(*Message) {
+	output2 := test.NewTestOutput(func(*plugin.Message) {
 		atomic.AddInt64(&counter, 1)
 		wg.Done()
 	})
 
-	plugins2 := &InOutPlugins{
-		Inputs:  []PluginReader{input2},
-		Outputs: []PluginWriter{output2},
+	plugins2 := &plugin.InOutPlugins{
+		Inputs:  []plugin.Reader{input2},
+		Outputs: []plugin.Writer{output2},
 	}
 	plugins2.All = append(plugins2.All, input2, output2)
 
-	emitter2 := NewEmitter()
-	go emitter2.Start(plugins2, Settings.Middleware)
+	em2 := emitter.New()
+	go em2.Start(plugins2)
 
 	wg.Wait()
-	emitter2.Close()
+	em2.Close()
 }
 
 func TestFileOutputWithNameCleaning(t *testing.T) {
@@ -87,16 +92,16 @@ func TestFileOutputMultipleFiles(t *testing.T) {
 		t.Error("Should not initialize file if no writes")
 	}
 
-	output.PluginWrite(&Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
+	output.PluginWrite(&plugin.Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
 	name1 := output.file.Name()
 
-	output.PluginWrite(&Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
+	output.PluginWrite(&plugin.Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
 	name2 := output.file.Name()
 
 	time.Sleep(time.Second)
 	output.updateName()
 
-	output.PluginWrite(&Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
+	output.PluginWrite(&plugin.Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
 	name3 := output.file.Name()
 
 	if name2 != name1 {
@@ -118,16 +123,16 @@ func TestFileOutputFilePerRequest(t *testing.T) {
 		t.Error("Should not initialize file if no writes")
 	}
 
-	output.PluginWrite(&Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
+	output.PluginWrite(&plugin.Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
 	name1 := output.file.Name()
 
-	output.PluginWrite(&Message{Meta: []byte("1 2 1\r\n"), Data: []byte("test")})
+	output.PluginWrite(&plugin.Message{Meta: []byte("1 2 1\r\n"), Data: []byte("test")})
 	name2 := output.file.Name()
 
 	time.Sleep(time.Second)
 	output.updateName()
 
-	output.PluginWrite(&Message{Meta: []byte("1 3 1\r\n"), Data: []byte("test")})
+	output.PluginWrite(&plugin.Message{Meta: []byte("1 3 1\r\n"), Data: []byte("test")})
 	name3 := output.file.Name()
 
 	if name3 == name2 || name2 == name1 || name3 == name1 {
@@ -147,7 +152,7 @@ func TestFileOutputCompression(t *testing.T) {
 	}
 
 	for i := 0; i < 1000; i++ {
-		output.PluginWrite(&Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
+		output.PluginWrite(&plugin.Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
 	}
 
 	name := output.file.Name()
@@ -173,8 +178,8 @@ func TestGetFileIndex(t *testing.T) {
 	}
 
 	for _, c := range tests {
-		if getFileIndex(c.path) != c.index {
-			t.Error(c.path, "should be", c.index, "instead", getFileIndex(c.path))
+		if GetFileIndex(c.path) != c.index {
+			t.Error(c.path, "should be", c.index, "instead", GetFileIndex(c.path))
 		}
 	}
 }
@@ -206,15 +211,15 @@ func TestFileOutputAppendQueueLimitOverflow(t *testing.T) {
 
 	output := NewFileOutput(name, &FileOutputConfig{Append: false, FlushInterval: time.Minute, QueueLimit: 2})
 
-	output.PluginWrite(&Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
+	output.PluginWrite(&plugin.Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
 	name1 := output.file.Name()
 
-	output.PluginWrite(&Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
+	output.PluginWrite(&plugin.Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
 	name2 := output.file.Name()
 
 	output.updateName()
 
-	output.PluginWrite(&Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
+	output.PluginWrite(&plugin.Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
 	name3 := output.file.Name()
 
 	if name2 != name1 || name1 != fmt.Sprintf("/tmp/%d_0", rnd) {
@@ -235,15 +240,15 @@ func TestFileOutputAppendQueueLimitNoOverflow(t *testing.T) {
 
 	output := NewFileOutput(name, &FileOutputConfig{Append: false, FlushInterval: time.Minute, QueueLimit: 3})
 
-	output.PluginWrite(&Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
+	output.PluginWrite(&plugin.Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
 	name1 := output.file.Name()
 
-	output.PluginWrite(&Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
+	output.PluginWrite(&plugin.Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
 	name2 := output.file.Name()
 
 	output.updateName()
 
-	output.PluginWrite(&Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
+	output.PluginWrite(&plugin.Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
 	name3 := output.file.Name()
 
 	if name2 != name1 || name1 != fmt.Sprintf("/tmp/%d_0", rnd) {
@@ -264,15 +269,15 @@ func TestFileOutputAppendQueueLimitGzips(t *testing.T) {
 
 	output := NewFileOutput(name, &FileOutputConfig{Append: false, FlushInterval: time.Minute, QueueLimit: 2})
 
-	output.PluginWrite(&Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
+	output.PluginWrite(&plugin.Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
 	name1 := output.file.Name()
 
-	output.PluginWrite(&Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
+	output.PluginWrite(&plugin.Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
 	name2 := output.file.Name()
 
 	output.updateName()
 
-	output.PluginWrite(&Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
+	output.PluginWrite(&plugin.Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
 	name3 := output.file.Name()
 
 	if name2 != name1 || name1 != fmt.Sprintf("/tmp/%d_0.gz", rnd) {
@@ -303,19 +308,19 @@ func TestFileOutputAppendSizeLimitOverflow(t *testing.T) {
 
 	message := []byte("1 1 1\r\ntest")
 
-	messageSize := len(message) + len(payloadSeparator)
+	messageSize := len(message) + len(proto.PayloadSeparator)
 
 	output := NewFileOutput(name, &FileOutputConfig{Append: false, FlushInterval: time.Minute, SizeLimit: size.Size(2 * messageSize)})
 
-	output.PluginWrite(&Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
+	output.PluginWrite(&plugin.Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
 	name1 := output.file.Name()
 
-	output.PluginWrite(&Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
+	output.PluginWrite(&plugin.Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
 	name2 := output.file.Name()
 
 	output.flush()
 
-	output.PluginWrite(&Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
+	output.PluginWrite(&plugin.Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
 	name3 := output.file.Name()
 
 	if name2 != name1 || name1 != fmt.Sprintf("/tmp/%d_0", rnd) {
diff --git a/output_s3.go b/pkg/file/output_s3.go
similarity index 79%
rename from output_s3.go
rename to pkg/file/output_s3.go
index 2cd57541..8a0725d2 100644
--- a/output_s3.go
+++ b/pkg/file/output_s3.go
@@ -1,10 +1,9 @@
-package goreplay
+package file
 
 import (
 	_ "bufio"
 	"fmt"
 	_ "io"
-	"log"
 	"math/rand"
 	"os"
 	"path/filepath"
@@ -14,8 +13,14 @@ import (
 	"github.com/aws/aws-sdk-go/aws/session"
 	"github.com/aws/aws-sdk-go/service/s3"
 	_ "github.com/aws/aws-sdk-go/service/s3/s3manager"
+	"github.com/buger/goreplay/pkg/plugin"
+	"github.com/buger/goreplay/pkg/pro"
+
+	"github.com/rs/zerolog/log"
 )
 
+var s3Logger = log.With().Str("component", "s3").Logger()
+
 // S3Output output plugin
 type S3Output struct {
 	pathTemplate string
@@ -28,8 +33,8 @@ type S3Output struct {
 
 // NewS3Output constructor for FileOutput, accepts path
 func NewS3Output(pathTemplate string, config *FileOutputConfig) *S3Output {
-	if !PRO {
-		log.Fatal("Using S3 output and input requires PRO license")
+	if !pro.PRO {
+		s3Logger.Fatal().Msg("Using S3 output and input requires PRO license")
 		return nil
 	}
 
@@ -63,12 +68,12 @@ func NewS3Output(pathTemplate string, config *FileOutputConfig) *S3Output {
 func (o *S3Output) connect() {
 	if o.session == nil {
 		o.session = session.Must(session.NewSession(awsConfig()))
-		log.Println("[S3 Output] S3 connection successfully initialized")
+		s3Logger.Info().Msg("[S3 Output] S3 connection successfully initialized")
 	}
 }
 
 // PluginWrite writes message to this plugin
-func (o *S3Output) PluginWrite(msg *Message) (n int, err error) {
+func (o *S3Output) PluginWrite(msg *plugin.Message) (n int, err error) {
 	return o.buffer.PluginWrite(msg)
 }
 
@@ -105,12 +110,12 @@ func (o *S3Output) keyPath(idx int) (bucket, key string) {
 
 func (o *S3Output) onBufferUpdate(path string) {
 	svc := s3.New(o.session)
-	idx := getFileIndex(path)
+	idx := GetFileIndex(path)
 	bucket, key := o.keyPath(idx)
 
 	file, err := os.Open(path)
 	if err != nil {
-		Debug(0, fmt.Sprintf("[S3 Output] Failed to open file %q. err: %q", path, err))
+		s3Logger.Error().Err(err).Msgf("[S3 Output] Failed to open file %q", path)
 		return
 	}
 	defer os.Remove(path)
@@ -121,7 +126,7 @@ func (o *S3Output) onBufferUpdate(path string) {
 		Key:    aws.String(key),
 	})
 	if err != nil {
-		Debug(0, fmt.Sprintf("[S3 Output] Failed to upload data to %q/%q, %q", bucket, key, err))
+		s3Logger.Error().Err(err).Msgf("[S3 Output] Failed to upload data to %q/%q", bucket, key)
 		return
 	}
 
diff --git a/s3_reader.go b/pkg/file/s3_reader.go
similarity index 82%
rename from s3_reader.go
rename to pkg/file/s3_reader.go
index e485cff5..8d28d42e 100644
--- a/s3_reader.go
+++ b/pkg/file/s3_reader.go
@@ -1,8 +1,8 @@
-package goreplay
+package file
 
 import (
 	"bytes"
-	"log"
+
 	"os"
 	"strconv"
 	"strings"
@@ -10,6 +10,7 @@ import (
 	"github.com/aws/aws-sdk-go/aws"
 	"github.com/aws/aws-sdk-go/aws/session"
 	"github.com/aws/aws-sdk-go/service/s3"
+	"github.com/buger/goreplay/pkg/pro"
 )
 
 // S3ReadCloser ...
@@ -36,10 +37,10 @@ func awsConfig() *aws.Config {
 
 	if endpoint := os.Getenv("AWS_ENDPOINT_URL"); endpoint != "" {
 		config.Endpoint = aws.String(endpoint)
-		log.Println("Custom endpoint:", endpoint)
+		s3Logger.Debug().Msgf("Custom endpoint: %s", endpoint)
 	}
 
-	log.Println("Connecting to S3. Region: " + region)
+	s3Logger.Debug().Msgf("Connecting to S3. Region: %s", region)
 
 	config.CredentialsChainVerboseErrors = aws.Bool(true)
 
@@ -52,15 +53,15 @@ func awsConfig() *aws.Config {
 
 // NewS3ReadCloser returns new instance of S3 read closer
 func NewS3ReadCloser(path string) *S3ReadCloser {
-	if !PRO {
-		log.Fatal("Using S3 input and output require PRO license")
+	if !pro.PRO {
+		s3Logger.Fatal().Msg("Using S3 input and output require PRO license")
 		return nil
 	}
 
 	bucket, key := parseS3Url(path)
 	sess := session.Must(session.NewSession(awsConfig()))
 
-	log.Println("[S3 Input] S3 connection successfully initialized", path)
+	s3Logger.Info().Msgf("S3 connection successfully initialized %v", path)
 
 	return &S3ReadCloser{
 		bucket: bucket,
@@ -87,7 +88,7 @@ func (s *S3ReadCloser) Read(b []byte) (n int, e error) {
 		resp, err := svc.GetObject(params)
 
 		if err != nil {
-			log.Println("[S3 Input] Error during getting file", s.bucket, s.key, err)
+			s3Logger.Error().Err(err).Msgf("Error during getting file %s %s", s.bucket, s.key)
 		} else {
 			s.totalSize, _ = strconv.Atoi(strings.Split(*resp.ContentRange, "/")[1])
 			s.buf.ReadFrom(resp.Body)
diff --git a/s3_test.go b/pkg/file/s3_test.go
similarity index 99%
rename from s3_test.go
rename to pkg/file/s3_test.go
index 218ef91b..edda0ffb 100644
--- a/s3_test.go
+++ b/pkg/file/s3_test.go
@@ -1,6 +1,6 @@
 //go:build pro
 
-package goreplay
+package file
 
 import (
 	"fmt"
diff --git a/input_http.go b/pkg/http/input_http.go
similarity index 72%
rename from input_http.go
rename to pkg/http/input_http.go
index 7ead5c80..892ab7c8 100644
--- a/input_http.go
+++ b/pkg/http/input_http.go
@@ -1,13 +1,19 @@
-package goreplay
+package http
 
 import (
-	"log"
 	"net"
 	"net/http"
 	"net/http/httputil"
 	"time"
+
+	"github.com/buger/goreplay/pkg/plugin"
+	"github.com/buger/goreplay/pkg/proto"
+
+	"github.com/rs/zerolog/log"
 )
 
+var inputLogger = log.With().Str("component", "input_http").Logger()
+
 // HTTPInput used for sending requests to Gor via http
 type HTTPInput struct {
 	data     chan []byte
@@ -28,14 +34,14 @@ func NewHTTPInput(address string) (i *HTTPInput) {
 }
 
 // PluginRead reads message from this plugin
-func (i *HTTPInput) PluginRead() (*Message, error) {
-	var msg Message
+func (i *HTTPInput) PluginRead() (*plugin.Message, error) {
+	var msg plugin.Message
 	select {
 	case <-i.stop:
-		return nil, ErrorStopped
+		return nil, plugin.ErrorStopped
 	case buf := <-i.data:
 		msg.Data = buf
-		msg.Meta = payloadHeader(RequestPayload, uuid(), time.Now().UnixNano(), -1)
+		msg.Meta = proto.PayloadHeader(proto.RequestPayload, proto.UUID(), time.Now().UnixNano(), -1)
 		return &msg, nil
 	}
 }
@@ -64,14 +70,14 @@ func (i *HTTPInput) listen(address string) {
 
 	i.listener, err = net.Listen("tcp", address)
 	if err != nil {
-		log.Fatal("HTTP input listener failure:", err)
+		inputLogger.Fatal().Err(err).Msg("HTTP input listener failure")
 	}
 	i.address = i.listener.Addr().String()
 
 	go func() {
 		err = http.Serve(i.listener, mux)
 		if err != nil && err != http.ErrServerClosed {
-			log.Fatal("HTTP input serve failure ", err)
+			inputLogger.Fatal().Err(err).Msg("HTTP input serve failure")
 		}
 	}()
 }
diff --git a/input_http_test.go b/pkg/http/input_http_test.go
similarity index 67%
rename from input_http_test.go
rename to pkg/http/input_http_test.go
index 873e0965..4f028db1 100644
--- a/input_http_test.go
+++ b/pkg/http/input_http_test.go
@@ -1,4 +1,4 @@
-package goreplay
+package http
 
 import (
 	"bytes"
@@ -7,6 +7,10 @@ import (
 	"sync"
 	"testing"
 	"time"
+
+	"github.com/buger/goreplay/pkg/emitter"
+	"github.com/buger/goreplay/pkg/plugin"
+	"github.com/buger/goreplay/pkg/test"
 )
 
 func TestHTTPInput(t *testing.T) {
@@ -14,18 +18,18 @@ func TestHTTPInput(t *testing.T) {
 
 	input := NewHTTPInput("127.0.0.1:0")
 	time.Sleep(time.Millisecond)
-	output := NewTestOutput(func(*Message) {
+	output := test.NewTestOutput(func(*plugin.Message) {
 		wg.Done()
 	})
 
-	plugins := &InOutPlugins{
-		Inputs:  []PluginReader{input},
-		Outputs: []PluginWriter{output},
+	plugins := &plugin.InOutPlugins{
+		Inputs:  []plugin.Reader{input},
+		Outputs: []plugin.Writer{output},
 	}
 	plugins.All = append(plugins.All, input, output)
 
-	emitter := NewEmitter()
-	go emitter.Start(plugins, Settings.Middleware)
+	emitter := emitter.New(&emitter.Config{})
+	go emitter.Start(plugins)
 
 	address := strings.Replace(input.address, "[::]", "127.0.0.1", -1)
 
@@ -45,22 +49,22 @@ func TestInputHTTPLargePayload(t *testing.T) {
 	large[n-1] = '0'
 
 	input := NewHTTPInput("127.0.0.1:0")
-	output := NewTestOutput(func(msg *Message) {
+	output := test.NewTestOutput(func(msg *plugin.Message) {
 		_len := len(msg.Data)
 		if _len >= n { // considering http body CRLF
 			t.Errorf("expected body to be >= %d", n)
 		}
 		wg.Done()
 	})
-	plugins := &InOutPlugins{
-		Inputs:  []PluginReader{input},
-		Outputs: []PluginWriter{output},
+	plugins := &plugin.InOutPlugins{
+		Inputs:  []plugin.Reader{input},
+		Outputs: []plugin.Writer{output},
 	}
 	plugins.All = append(plugins.All, input, output)
 
-	emitter := NewEmitter()
+	emitter := emitter.New()
 	defer emitter.Close()
-	go emitter.Start(plugins, Settings.Middleware)
+	go emitter.Start(plugins)
 
 	address := strings.Replace(input.address, "[::]", "127.0.0.1", -1)
 	var req *http.Request
diff --git a/output_http.go b/pkg/http/output_http.go
similarity index 80%
rename from output_http.go
rename to pkg/http/output_http.go
index 7ba57c80..0ec852a6 100644
--- a/output_http.go
+++ b/pkg/http/output_http.go
@@ -1,24 +1,30 @@
-package goreplay
+package http
 
 import (
 	"bufio"
 	"bytes"
 	"crypto/tls"
 	"fmt"
-	"github.com/buger/goreplay/internal/size"
-	"log"
 	"math"
 	"net/http"
 	"net/http/httputil"
 	"net/url"
 	"sync/atomic"
 	"time"
+
+	"github.com/buger/goreplay/internal/size"
+	"github.com/buger/goreplay/pkg/elasticsearch"
+	"github.com/buger/goreplay/pkg/plugin"
+	"github.com/buger/goreplay/pkg/proto"
+	"github.com/buger/goreplay/pkg/stats"
+
+	"github.com/rs/zerolog/log"
 )
 
+var outputLogger = log.With().Str("component", "output_http").Logger()
+
 const (
-	initialDynamicWorkers = 10
-	readChunkSize         = 64 * 1024
-	maxResponseSize       = 1073741824
+	readChunkSize = 64 * 1024
 )
 
 type response struct {
@@ -71,24 +77,24 @@ func (hoc *HTTPOutputConfig) Copy() *HTTPOutputConfig {
 type HTTPOutput struct {
 	activeWorkers int32
 	config        *HTTPOutputConfig
-	queueStats    *GorStat
-	elasticSearch *ESPlugin
+	queueStats    *stats.Stats
+	elasticSearch *elasticsearch.ESPlugin
 	client        *HTTPClient
 	stopWorker    chan struct{}
-	queue         chan *Message
-	responses     chan *response
+	queue         chan *plugin.Message
+	responses     chan *plugin.Response
 	stop          chan bool // Channel used only to indicate goroutine should shutdown
 }
 
 // NewHTTPOutput constructor for HTTPOutput
 // Initialize workers
-func NewHTTPOutput(address string, config *HTTPOutputConfig) PluginReadWriter {
+func NewHTTPOutput(address string, config *HTTPOutputConfig) plugin.ReadWriter {
 	o := new(HTTPOutput)
 	var err error
 	newConfig := config.Copy()
 	newConfig.url, err = url.Parse(address)
 	if err != nil {
-		log.Fatal(fmt.Sprintf("[OUTPUT-HTTP] parse HTTP output URL error[%q]", err))
+		outputLogger.Fatal().Msg(fmt.Sprintf("[OUTPUT-HTTP] parse HTTP output URL error[%q]", err))
 	}
 	if newConfig.url.Scheme == "" {
 		newConfig.url.Scheme = "http"
@@ -124,18 +130,18 @@ func NewHTTPOutput(address string, config *HTTPOutputConfig) PluginReadWriter {
 	o.config = newConfig
 	o.stop = make(chan bool)
 	if o.config.Stats {
-		o.queueStats = NewGorStat("output_http", o.config.StatsMs)
+		o.queueStats = stats.New("output_http", o.config.StatsMs)
 	}
 
-	o.queue = make(chan *Message, o.config.QueueLen)
+	o.queue = make(chan *plugin.Message, o.config.QueueLen)
 	if o.config.TrackResponses {
-		o.responses = make(chan *response, o.config.QueueLen)
+		o.responses = make(chan *plugin.Response, o.config.QueueLen)
 	}
 	// it should not be buffered to avoid races
 	o.stopWorker = make(chan struct{})
 
 	if o.config.ElasticSearch != "" {
-		o.elasticSearch = new(ESPlugin)
+		o.elasticSearch = new(elasticsearch.ESPlugin)
 		o.elasticSearch.Init(o.config.ElasticSearch)
 	}
 	o.client = NewHTTPClient(o.config)
@@ -186,14 +192,14 @@ func (o *HTTPOutput) startWorker() {
 }
 
 // PluginWrite writes message to this plugin
-func (o *HTTPOutput) PluginWrite(msg *Message) (n int, err error) {
-	if !isRequestPayload(msg.Meta) {
+func (o *HTTPOutput) PluginWrite(msg *plugin.Message) (n int, err error) {
+	if !proto.IsRequestPayload(msg.Meta) {
 		return len(msg.Data), nil
 	}
 
 	select {
 	case <-o.stop:
-		return 0, ErrorStopped
+		return 0, plugin.ErrorStopped
 	case o.queue <- msg:
 	}
 
@@ -211,36 +217,36 @@ func (o *HTTPOutput) PluginWrite(msg *Message) (n int, err error) {
 }
 
 // PluginRead reads message from this plugin
-func (o *HTTPOutput) PluginRead() (*Message, error) {
+func (o *HTTPOutput) PluginRead() (*plugin.Message, error) {
 	if !o.config.TrackResponses {
-		return nil, ErrorStopped
+		return nil, plugin.ErrorStopped
 	}
-	var resp *response
-	var msg Message
+	var resp *plugin.Response
+	var msg plugin.Message
 	select {
 	case <-o.stop:
-		return nil, ErrorStopped
+		return nil, plugin.ErrorStopped
 	case resp = <-o.responses:
-		msg.Data = resp.payload
+		msg.Data = resp.Payload
 	}
 
-	msg.Meta = payloadHeader(ReplayedResponsePayload, resp.uuid, resp.startedAt, resp.roundTripTime)
+	msg.Meta = proto.PayloadHeader(proto.ReplayedResponsePayload, resp.UUID, resp.StartedAt, resp.RoundTripTime)
 
 	return &msg, nil
 }
 
-func (o *HTTPOutput) sendRequest(client *HTTPClient, msg *Message) {
-	if !isRequestPayload(msg.Meta) {
+func (o *HTTPOutput) sendRequest(client *HTTPClient, msg *plugin.Message) {
+	if !proto.IsRequestPayload(msg.Meta) {
 		return
 	}
 
-	uuid := payloadID(msg.Meta)
+	uuid := proto.PayloadID(msg.Meta)
 	start := time.Now()
 	resp, err := client.Send(msg.Data)
 	stop := time.Now()
 
 	if err != nil {
-		Debug(1, fmt.Sprintf("[HTTP-OUTPUT] error when sending: %q", err))
+		outputLogger.Error().Err(err).Msg("[HTTP-OUTPUT]")
 		return
 	}
 	if resp == nil {
@@ -248,7 +254,7 @@ func (o *HTTPOutput) sendRequest(client *HTTPClient, msg *Message) {
 	}
 
 	if o.config.TrackResponses {
-		o.responses <- &response{resp, uuid, start.UnixNano(), stop.UnixNano() - start.UnixNano()}
+		o.responses <- &plugin.Response{resp, uuid, start.UnixNano(), stop.UnixNano() - start.UnixNano()}
 	}
 
 	if o.elasticSearch != nil {
@@ -282,12 +288,12 @@ func NewHTTPClient(config *HTTPOutputConfig) *HTTPClient {
 		Timeout: client.config.Timeout,
 		CheckRedirect: func(req *http.Request, via []*http.Request) error {
 			if len(via) >= client.config.RedirectLimit {
-				Debug(1, fmt.Sprintf("[HTTPCLIENT] maximum output-http-redirects[%d] reached!", client.config.RedirectLimit))
+				outputLogger.Warn().Msgf("[HTTPCLIENT] maximum output-http-redirects[%d] reached!", client.config.RedirectLimit)
 				return http.ErrUseLastResponse
 			}
 			lastReq := via[len(via)-1]
 			resp := req.Response
-			Debug(2, fmt.Sprintf("[HTTPCLIENT] HTTP redirects from %q to %q with %q", lastReq.Host, req.Host, resp.Status))
+			outputLogger.Info().Msgf("[HTTPCLIENT] HTTP redirects from %q to %q with %q", lastReq.Host, req.Host, resp.Status)
 			return nil
 		},
 	}
diff --git a/output_http_test.go b/pkg/http/output_http_test.go
similarity index 62%
rename from output_http_test.go
rename to pkg/http/output_http_test.go
index d884609b..467bbb74 100644
--- a/output_http_test.go
+++ b/pkg/http/output_http_test.go
@@ -1,4 +1,4 @@
-package goreplay
+package http
 
 import (
 	"io/ioutil"
@@ -7,12 +7,19 @@ import (
 	_ "net/http/httputil"
 	"sync"
 	"testing"
+
+	"github.com/buger/goreplay/pkg/emitter"
+	"github.com/buger/goreplay/pkg/http_modifier"
+	"github.com/buger/goreplay/pkg/plugin"
+	"github.com/buger/goreplay/pkg/pro"
+	"github.com/buger/goreplay/pkg/proto"
+	"github.com/buger/goreplay/pkg/test"
 )
 
 func TestHTTPOutput(t *testing.T) {
 	wg := new(sync.WaitGroup)
 
-	input := NewTestInput()
+	input := test.NewTestInput()
 
 	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
 		if req.Header.Get("User-Agent") != "Gor" {
@@ -36,23 +43,25 @@ func TestHTTPOutput(t *testing.T) {
 	}))
 	defer server.Close()
 
-	headers := HTTPHeaders{httpHeader{"User-Agent", "Gor"}}
-	methods := HTTPMethods{[]byte("GET"), []byte("PUT"), []byte("POST")}
-	Settings.ModifierConfig = HTTPModifierConfig{Headers: headers, Methods: methods}
+	headers := http_modifier.HTTPHeaders{http_modifier.HTTPHeader{"User-Agent", "Gor"}}
+	methods := http_modifier.HTTPMethods{[]byte("GET"), []byte("PUT"), []byte("POST")}
+	modifierConfig := http_modifier.HTTPModifierConfig{Headers: headers, Methods: methods}
 
 	httpOutput := NewHTTPOutput(server.URL, &HTTPOutputConfig{TrackResponses: false})
-	output := NewTestOutput(func(*Message) {
+	output := test.NewTestOutput(func(*plugin.Message) {
 		wg.Done()
 	})
 
-	plugins := &InOutPlugins{
-		Inputs:  []PluginReader{input},
-		Outputs: []PluginWriter{httpOutput, output},
+	plugins := &plugin.InOutPlugins{
+		Inputs:  []plugin.Reader{input},
+		Outputs: []plugin.Writer{httpOutput, output},
 	}
 	plugins.All = append(plugins.All, input, output, httpOutput)
 
-	emitter := NewEmitter()
-	go emitter.Start(plugins, Settings.Middleware)
+	emitter := emitter.New(&emitter.Config{
+		ModifierConfig: modifierConfig,
+	})
+	go emitter.Start(plugins)
 
 	for i := 0; i < 10; i++ {
 		// 2 http-output, 2 - test output request
@@ -64,14 +73,12 @@ func TestHTTPOutput(t *testing.T) {
 
 	wg.Wait()
 	emitter.Close()
-
-	Settings.ModifierConfig = HTTPModifierConfig{}
 }
 
 func TestHTTPOutputKeepOriginalHost(t *testing.T) {
 	wg := new(sync.WaitGroup)
 
-	input := NewTestInput()
+	input := test.NewTestInput()
 
 	server := httptest.NewTLSServer(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
 		if req.Host != "custom-host.com" {
@@ -82,26 +89,27 @@ func TestHTTPOutputKeepOriginalHost(t *testing.T) {
 	}))
 	defer server.Close()
 
-	headers := HTTPHeaders{httpHeader{"Host", "custom-host.com"}}
-	Settings.ModifierConfig = HTTPModifierConfig{Headers: headers}
+	headers := http_modifier.HTTPHeaders{http_modifier.HTTPHeader{"Host", "custom-host.com"}}
+	modifierConfig := http_modifier.HTTPModifierConfig{Headers: headers}
 
 	output := NewHTTPOutput(server.URL, &HTTPOutputConfig{OriginalHost: true, SkipVerify: true})
 
-	plugins := &InOutPlugins{
-		Inputs:  []PluginReader{input},
-		Outputs: []PluginWriter{output},
+	plugins := &plugin.InOutPlugins{
+		Inputs:  []plugin.Reader{input},
+		Outputs: []plugin.Writer{output},
 	}
 	plugins.All = append(plugins.All, input, output)
 
-	emitter := NewEmitter()
-	go emitter.Start(plugins, Settings.Middleware)
+	emitter := emitter.New(&emitter.Config{
+		ModifierConfig: modifierConfig,
+	})
+	go emitter.Start(plugins)
 
 	wg.Add(1)
 	input.EmitGET()
 
 	wg.Wait()
 	emitter.Close()
-	Settings.ModifierConfig = HTTPModifierConfig{}
 }
 
 func TestHTTPOutputSSL(t *testing.T) {
@@ -112,17 +120,17 @@ func TestHTTPOutputSSL(t *testing.T) {
 		wg.Done()
 	}))
 
-	input := NewTestInput()
+	input := test.NewTestInput()
 	output := NewHTTPOutput(server.URL, &HTTPOutputConfig{SkipVerify: true})
 
-	plugins := &InOutPlugins{
-		Inputs:  []PluginReader{input},
-		Outputs: []PluginWriter{output},
+	plugins := &plugin.InOutPlugins{
+		Inputs:  []plugin.Reader{input},
+		Outputs: []plugin.Writer{output},
 	}
 	plugins.All = append(plugins.All, input, output)
 
-	emitter := NewEmitter()
-	go emitter.Start(plugins, Settings.Middleware)
+	emitter := emitter.New()
+	go emitter.Start(plugins)
 
 	wg.Add(2)
 
@@ -134,49 +142,49 @@ func TestHTTPOutputSSL(t *testing.T) {
 }
 
 func TestHTTPOutputSessions(t *testing.T) {
+	pro.Enable()
+
 	wg := new(sync.WaitGroup)
 
-	input := NewTestInput()
-	input.skipHeader = true
+	input := test.NewTestInput()
+	input.SkipHeader = true
 
 	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
 		wg.Done()
 	}))
 	defer server.Close()
 
-	Settings.RecognizeTCPSessions = true
-	Settings.SplitOutput = true
 	output := NewHTTPOutput(server.URL, &HTTPOutputConfig{})
 
-	plugins := &InOutPlugins{
-		Inputs:  []PluginReader{input},
-		Outputs: []PluginWriter{output},
+	plugins := &plugin.InOutPlugins{
+		Inputs:  []plugin.Reader{input},
+		Outputs: []plugin.Writer{output},
 	}
 	plugins.All = append(plugins.All, input, output)
-	emitter := NewEmitter()
-	go emitter.Start(plugins, Settings.Middleware)
+	emitter := emitter.New(&emitter.Config{
+		RecognizeTCPSessions: true,
+		SplitOutput:          true,
+	})
+	go emitter.Start(plugins)
 
 	uuid1 := []byte("1234567890123456789a0000")
 	uuid2 := []byte("1234567890123456789d0000")
 
 	for i := 0; i < 10; i++ {
 		wg.Add(1) // OPTIONS should be ignored
-		copy(uuid1[20:], randByte(4))
+		copy(uuid1[20:], proto.RandByte(4))
 		input.EmitBytes([]byte("1 " + string(uuid1) + " 1\n" + "GET / HTTP/1.1\r\n\r\n"))
 	}
 
 	for i := 0; i < 10; i++ {
 		wg.Add(1) // OPTIONS should be ignored
-		copy(uuid2[20:], randByte(4))
+		copy(uuid2[20:], proto.RandByte(4))
 		input.EmitBytes([]byte("1 " + string(uuid2) + " 1\n" + "GET / HTTP/1.1\r\n\r\n"))
 	}
 
 	wg.Wait()
 
 	emitter.Close()
-
-	Settings.RecognizeTCPSessions = false
-	Settings.SplitOutput = false
 }
 
 func BenchmarkHTTPOutput(b *testing.B) {
@@ -187,17 +195,17 @@ func BenchmarkHTTPOutput(b *testing.B) {
 	}))
 	defer server.Close()
 
-	input := NewTestInput()
+	input := test.NewTestInput()
 	output := NewHTTPOutput(server.URL, &HTTPOutputConfig{WorkersMax: 1})
 
-	plugins := &InOutPlugins{
-		Inputs:  []PluginReader{input},
-		Outputs: []PluginWriter{output},
+	plugins := &plugin.InOutPlugins{
+		Inputs:  []plugin.Reader{input},
+		Outputs: []plugin.Writer{output},
 	}
 	plugins.All = append(plugins.All, input, output)
 
-	emitter := NewEmitter()
-	go emitter.Start(plugins, Settings.Middleware)
+	emitter := emitter.New()
+	go emitter.Start(plugins)
 
 	for i := 0; i < b.N; i++ {
 		wg.Add(1)
@@ -216,17 +224,17 @@ func BenchmarkHTTPOutputTLS(b *testing.B) {
 	}))
 	defer server.Close()
 
-	input := NewTestInput()
+	input := test.NewTestInput()
 	output := NewHTTPOutput(server.URL, &HTTPOutputConfig{SkipVerify: true, WorkersMax: 1})
 
-	plugins := &InOutPlugins{
-		Inputs:  []PluginReader{input},
-		Outputs: []PluginWriter{output},
+	plugins := &plugin.InOutPlugins{
+		Inputs:  []plugin.Reader{input},
+		Outputs: []plugin.Writer{output},
 	}
 	plugins.All = append(plugins.All, input, output)
 
-	emitter := NewEmitter()
-	go emitter.Start(plugins, Settings.Middleware)
+	emitter := emitter.New()
+	go emitter.Start(plugins)
 
 	for i := 0; i < b.N; i++ {
 		wg.Add(1)
diff --git a/http_modifier.go b/pkg/http_modifier/http_modifier.go
similarity index 98%
rename from http_modifier.go
rename to pkg/http_modifier/http_modifier.go
index 859b4031..db808bf0 100644
--- a/http_modifier.go
+++ b/pkg/http_modifier/http_modifier.go
@@ -1,11 +1,12 @@
-package goreplay
+package http_modifier
 
 import (
 	"bytes"
 	"encoding/base64"
-	"github.com/buger/goreplay/proto"
 	"hash/fnv"
 	"strings"
+
+	proto "github.com/buger/goreplay/pkg/http_proto"
 )
 
 type HTTPModifier struct {
diff --git a/http_modifier_settings.go b/pkg/http_modifier/http_modifier_settings.go
similarity index 98%
rename from http_modifier_settings.go
rename to pkg/http_modifier/http_modifier_settings.go
index c7731484..66331fa6 100644
--- a/http_modifier_settings.go
+++ b/pkg/http_modifier/http_modifier_settings.go
@@ -1,4 +1,4 @@
-package goreplay
+package http_modifier
 
 import (
 	"errors"
@@ -124,13 +124,13 @@ func (h *HTTPHashFilters) Set(value string) error {
 }
 
 // Handling of --http-set-header option
-type httpHeader struct {
+type HTTPHeader struct {
 	Name  string
 	Value string
 }
 
 // HTTPHeaders is a slice of headers that must appended
-type HTTPHeaders []httpHeader
+type HTTPHeaders []HTTPHeader
 
 func (h *HTTPHeaders) String() string {
 	return fmt.Sprint(*h)
@@ -143,7 +143,7 @@ func (h *HTTPHeaders) Set(value string) error {
 		return errors.New("Expected `Key: Value`")
 	}
 
-	header := httpHeader{
+	header := HTTPHeader{
 		strings.TrimSpace(v[0]),
 		strings.TrimSpace(v[1]),
 	}
diff --git a/http_modifier_settings_test.go b/pkg/http_modifier/http_modifier_settings_test.go
similarity index 98%
rename from http_modifier_settings_test.go
rename to pkg/http_modifier/http_modifier_settings_test.go
index 03547fd0..bb30a953 100644
--- a/http_modifier_settings_test.go
+++ b/pkg/http_modifier/http_modifier_settings_test.go
@@ -1,4 +1,4 @@
-package goreplay
+package http_modifier
 
 import (
 	"testing"
diff --git a/http_modifier_test.go b/pkg/http_modifier/http_modifier_test.go
similarity index 99%
rename from http_modifier_test.go
rename to pkg/http_modifier/http_modifier_test.go
index e890248e..532c5af8 100644
--- a/http_modifier_test.go
+++ b/pkg/http_modifier/http_modifier_test.go
@@ -1,9 +1,10 @@
-package goreplay
+package http_modifier
 
 import (
 	"bytes"
-	"github.com/buger/goreplay/proto"
 	"testing"
+
+	proto "github.com/buger/goreplay/pkg/http_proto"
 )
 
 func TestHTTPModifierWithoutConfig(t *testing.T) {
diff --git a/proto/fuzz.go b/pkg/http_proto/fuzz.go
similarity index 81%
rename from proto/fuzz.go
rename to pkg/http_proto/fuzz.go
index 8521391d..bb645b33 100644
--- a/proto/fuzz.go
+++ b/pkg/http_proto/fuzz.go
@@ -1,6 +1,6 @@
 //go:build gofuzz
 
-package proto
+package http_proto
 
 func Fuzz(data []byte) int {
 
diff --git a/proto/proto.go b/pkg/http_proto/proto.go
similarity index 99%
rename from proto/proto.go
rename to pkg/http_proto/proto.go
index 1c3abe6b..2978c37c 100644
--- a/proto/proto.go
+++ b/pkg/http_proto/proto.go
@@ -14,11 +14,12 @@ Example of HTTP payload for future references, new line symbols escaped:
 	\r\n
 	\r\n
 */
-package proto
+package http_proto
 
 import (
 	"bufio"
 	"bytes"
+
 	"github.com/buger/goreplay/internal/byteutils"
 
 	_ "fmt"
diff --git a/proto/proto_test.go b/pkg/http_proto/proto_test.go
similarity index 99%
rename from proto/proto_test.go
rename to pkg/http_proto/proto_test.go
index 3afe1f62..204194d2 100644
--- a/proto/proto_test.go
+++ b/pkg/http_proto/proto_test.go
@@ -1,4 +1,4 @@
-package proto
+package http_proto
 
 import (
 	"bytes"
diff --git a/input_kafka.go b/pkg/kafka/input_kafka.go
similarity index 76%
rename from input_kafka.go
rename to pkg/kafka/input_kafka.go
index a4c2fa22..dbe2db33 100644
--- a/input_kafka.go
+++ b/pkg/kafka/input_kafka.go
@@ -1,12 +1,15 @@
-package goreplay
+package kafka
 
 import (
 	"encoding/json"
-	"log"
 	"strings"
 
 	"github.com/Shopify/sarama"
 	"github.com/Shopify/sarama/mocks"
+	"github.com/buger/goreplay/pkg/plugin"
+	"github.com/buger/goreplay/pkg/proto"
+
+	"github.com/rs/zerolog/log"
 )
 
 // KafkaInput is used for receiving Kafka messages and
@@ -31,13 +34,13 @@ func NewKafkaInput(_ string, config *InputKafkaConfig, tlsConfig *KafkaTLSConfig
 		con, err = sarama.NewConsumer(strings.Split(config.Host, ","), c)
 
 		if err != nil {
-			log.Fatalln("Failed to start Sarama(Kafka) consumer:", err)
+			log.Fatal().Err(err).Msg("Failed to start Sarama(Kafka) consumer")
 		}
 	}
 
 	partitions, err := con.Partitions(config.Topic)
 	if err != nil {
-		log.Fatalln("Failed to collect Sarama(Kafka) partitions:", err)
+		log.Fatal().Err(err).Msg("Failed to collect Sarama(Kafka) partitions")
 	}
 
 	i := &KafkaInput{
@@ -50,7 +53,7 @@ func NewKafkaInput(_ string, config *InputKafkaConfig, tlsConfig *KafkaTLSConfig
 	for index, partition := range partitions {
 		consumer, err := con.ConsumePartition(config.Topic, partition, sarama.OffsetNewest)
 		if err != nil {
-			log.Fatalln("Failed to start Sarama(Kafka) partition consumer:", err)
+			log.Fatal().Err(err).Msg("Failed to start Sarama(Kafka) partition consumer")
 		}
 
 		go func(consumer sarama.PartitionConsumer) {
@@ -72,17 +75,17 @@ func NewKafkaInput(_ string, config *InputKafkaConfig, tlsConfig *KafkaTLSConfig
 // ErrorHandler should receive errors
 func (i *KafkaInput) ErrorHandler(consumer sarama.PartitionConsumer) {
 	for err := range consumer.Errors() {
-		Debug(1, "Failed to read access log entry:", err)
+		log.Error().Err(err).Msg("Failed to read access log entry")
 	}
 }
 
 // PluginRead a reads message from this plugin
-func (i *KafkaInput) PluginRead() (*Message, error) {
+func (i *KafkaInput) PluginRead() (*plugin.Message, error) {
 	var message *sarama.ConsumerMessage
-	var msg Message
+	var msg plugin.Message
 	select {
 	case <-i.quit:
-		return nil, ErrorStopped
+		return nil, plugin.ErrorStopped
 	case message = <-i.messages:
 	}
 
@@ -95,14 +98,14 @@ func (i *KafkaInput) PluginRead() (*Message, error) {
 		var err error
 		msg.Data, err = kafkaMessage.Dump()
 		if err != nil {
-			Debug(1, "[INPUT-KAFKA] failed to decode access log entry:", err)
+			log.Error().Err(err).Msg("Failed to decode access log entry")
 			return nil, err
 		}
 	}
 
 	// does it have meta
-	if isOriginPayload(msg.Data) {
-		msg.Meta, msg.Data = payloadMetaWithBody(msg.Data)
+	if proto.IsOriginPayload(msg.Data) {
+		msg.Meta, msg.Data = proto.PayloadMetaWithBody(msg.Data)
 	}
 
 	return &msg, nil
diff --git a/input_kafka_test.go b/pkg/kafka/input_kafka_test.go
similarity index 98%
rename from input_kafka_test.go
rename to pkg/kafka/input_kafka_test.go
index d632cf82..0fbcacbf 100644
--- a/input_kafka_test.go
+++ b/pkg/kafka/input_kafka_test.go
@@ -1,4 +1,4 @@
-package goreplay
+package kafka
 
 import (
 	"testing"
diff --git a/kafka.go b/pkg/kafka/kafka.go
similarity index 97%
rename from kafka.go
rename to pkg/kafka/kafka.go
index f1497701..80c7b471 100644
--- a/kafka.go
+++ b/pkg/kafka/kafka.go
@@ -1,4 +1,4 @@
-package goreplay
+package kafka
 
 import (
 	"bytes"
@@ -8,10 +8,11 @@ import (
 	"crypto/x509"
 	"errors"
 	"fmt"
-	"github.com/buger/goreplay/proto"
 	"io/ioutil"
 	"log"
 
+	"github.com/buger/goreplay/pkg/http_proto"
+
 	"github.com/Shopify/sarama"
 	"github.com/xdg-go/scram"
 )
@@ -127,13 +128,13 @@ func (m KafkaMessage) Dump() ([]byte, error) {
 
 	b.WriteString(fmt.Sprintf("%s %s %s\n", m.ReqType, m.ReqID, m.ReqTs))
 	b.WriteString(fmt.Sprintf("%s %s HTTP/1.1", m.ReqMethod, m.ReqURL))
-	b.Write(proto.CRLF)
+	b.Write(http_proto.CRLF)
 	for key, value := range m.ReqHeaders {
 		b.WriteString(fmt.Sprintf("%s: %s", key, value))
-		b.Write(proto.CRLF)
+		b.Write(http_proto.CRLF)
 	}
 
-	b.Write(proto.CRLF)
+	b.Write(http_proto.CRLF)
 	b.WriteString(m.ReqBody)
 
 	return b.Bytes(), nil
diff --git a/output_kafka.go b/pkg/kafka/output_kafka.go
similarity index 75%
rename from output_kafka.go
rename to pkg/kafka/output_kafka.go
index faa50519..7db9791b 100644
--- a/output_kafka.go
+++ b/pkg/kafka/output_kafka.go
@@ -1,15 +1,19 @@
-package goreplay
+package kafka
 
 import (
 	"encoding/json"
-	"github.com/buger/goreplay/internal/byteutils"
-	"github.com/buger/goreplay/proto"
-	"log"
 	"strings"
 	"time"
 
+	"github.com/buger/goreplay/internal/byteutils"
+	"github.com/buger/goreplay/pkg/http_proto"
+	"github.com/buger/goreplay/pkg/plugin"
+	"github.com/buger/goreplay/pkg/proto"
+
 	"github.com/Shopify/sarama"
 	"github.com/Shopify/sarama/mocks"
+
+	"github.com/rs/zerolog/log"
 )
 
 // KafkaOutput is used for sending payloads to kafka in JSON format.
@@ -22,7 +26,7 @@ type KafkaOutput struct {
 const KafkaOutputFrequency = 500
 
 // NewKafkaOutput creates instance of kafka producer client  with TLS config
-func NewKafkaOutput(_ string, config *OutputKafkaConfig, tlsConfig *KafkaTLSConfig) PluginWriter {
+func NewKafkaOutput(_ string, config *OutputKafkaConfig, tlsConfig *KafkaTLSConfig) plugin.Writer {
 	c := NewKafkaConfig(&config.SASLConfig, tlsConfig)
 
 	var producer sarama.AsyncProducer
@@ -39,7 +43,7 @@ func NewKafkaOutput(_ string, config *OutputKafkaConfig, tlsConfig *KafkaTLSConf
 		var err error
 		producer, err = sarama.NewAsyncProducer(brokerList, c)
 		if err != nil {
-			log.Fatalln("Failed to start Sarama(Kafka) producer:", err)
+			log.Fatal().Err(err).Msg("Failed to start Sarama(Kafka) producer")
 		}
 	}
 
@@ -57,33 +61,33 @@ func NewKafkaOutput(_ string, config *OutputKafkaConfig, tlsConfig *KafkaTLSConf
 // ErrorHandler should receive errors
 func (o *KafkaOutput) ErrorHandler() {
 	for err := range o.producer.Errors() {
-		Debug(1, "Failed to write access log entry:", err)
+		log.Error().Err(err).Msg("Failed to write access log entry")
 	}
 }
 
 // PluginWrite writes a message to this plugin
-func (o *KafkaOutput) PluginWrite(msg *Message) (n int, err error) {
+func (o *KafkaOutput) PluginWrite(msg *plugin.Message) (n int, err error) {
 	var message sarama.StringEncoder
 
 	if !o.config.UseJSON {
 		message = sarama.StringEncoder(byteutils.SliceToString(msg.Meta) + byteutils.SliceToString(msg.Data))
 	} else {
-		mimeHeader := proto.ParseHeaders(msg.Data)
+		mimeHeader := http_proto.ParseHeaders(msg.Data)
 		header := make(map[string]string)
 		for k, v := range mimeHeader {
 			header[k] = strings.Join(v, ", ")
 		}
 
-		meta := payloadMeta(msg.Meta)
+		meta := proto.PayloadMeta(msg.Meta)
 		req := msg.Data
 
 		kafkaMessage := KafkaMessage{
-			ReqURL:     byteutils.SliceToString(proto.Path(req)),
+			ReqURL:     byteutils.SliceToString(http_proto.Path(req)),
 			ReqType:    byteutils.SliceToString(meta[0]),
 			ReqID:      byteutils.SliceToString(meta[1]),
 			ReqTs:      byteutils.SliceToString(meta[2]),
-			ReqMethod:  byteutils.SliceToString(proto.Method(req)),
-			ReqBody:    byteutils.SliceToString(proto.Body(req)),
+			ReqMethod:  byteutils.SliceToString(http_proto.Method(req)),
+			ReqBody:    byteutils.SliceToString(http_proto.Body(req)),
 			ReqHeaders: header,
 		}
 		jsonMessage, _ := json.Marshal(&kafkaMessage)
diff --git a/output_kafka_test.go b/pkg/kafka/output_kafka_test.go
similarity index 80%
rename from output_kafka_test.go
rename to pkg/kafka/output_kafka_test.go
index b4481611..24c372e3 100644
--- a/output_kafka_test.go
+++ b/pkg/kafka/output_kafka_test.go
@@ -1,10 +1,11 @@
-package goreplay
+package kafka
 
 import (
 	"testing"
 
 	"github.com/Shopify/sarama"
 	"github.com/Shopify/sarama/mocks"
+	"github.com/buger/goreplay/pkg/plugin"
 )
 
 func TestOutputKafkaRAW(t *testing.T) {
@@ -19,7 +20,7 @@ func TestOutputKafkaRAW(t *testing.T) {
 		UseJSON:  false,
 	}, nil)
 
-	output.PluginWrite(&Message{Meta: []byte("1 2 3\n"), Data: []byte("GET / HTTP1.1\r\nHeader: 1\r\n\r\n")})
+	output.PluginWrite(&plugin.Message{Meta: []byte("1 2 3\n"), Data: []byte("GET / HTTP1.1\r\nHeader: 1\r\n\r\n")})
 
 	resp := <-producer.Successes()
 
@@ -42,7 +43,7 @@ func TestOutputKafkaJSON(t *testing.T) {
 		UseJSON:  true,
 	}, nil)
 
-	output.PluginWrite(&Message{Meta: []byte("1 2 3\n"), Data: []byte("GET / HTTP1.1\r\nHeader: 1\r\n\r\n")})
+	output.PluginWrite(&plugin.Message{Meta: []byte("1 2 3\n"), Data: []byte("GET / HTTP1.1\r\nHeader: 1\r\n\r\n")})
 
 	resp := <-producer.Successes()
 
diff --git a/middleware.go b/pkg/middleware/middleware.go
similarity index 56%
rename from middleware.go
rename to pkg/middleware/middleware.go
index 740b8132..705e175c 100644
--- a/middleware.go
+++ b/pkg/middleware/middleware.go
@@ -1,4 +1,4 @@
-package goreplay
+package middleware
 
 import (
 	"bufio"
@@ -11,30 +11,47 @@ import (
 	"strings"
 	"sync"
 	"syscall"
+
+	"github.com/buger/goreplay/pkg/plugin"
+	"github.com/buger/goreplay/pkg/prettify"
+	"github.com/buger/goreplay/pkg/proto"
+
+	"github.com/rs/zerolog"
+	"github.com/rs/zerolog/log"
 )
 
 // Middleware represents a middleware object
 type Middleware struct {
-	command       string
-	data          chan *Message
+	Command       string
+	Data          chan *plugin.Message
 	Stdin         io.Writer
 	Stdout        io.Reader
-	commandCancel context.CancelFunc
-	stop          chan bool // Channel used only to indicate goroutine should shutdown
+	CommandCancel context.CancelFunc
+	Stop          chan bool // Channel used only to indicate goroutine should shutdown
 	closed        bool
+	config        *MiddlewareConfig
 	mu            sync.RWMutex
 }
 
+// MiddlewareConfig represents a middleware configuration
+type MiddlewareConfig struct {
+	PrettifyHTTP bool
+}
+
 // NewMiddleware returns new middleware
-func NewMiddleware(command string) *Middleware {
+func NewMiddleware(command string, config *MiddlewareConfig) *Middleware {
 	m := new(Middleware)
-	m.command = command
-	m.data = make(chan *Message, 1000)
-	m.stop = make(chan bool)
+	m.Command = command
+	m.Data = make(chan *plugin.Message, 1000)
+	m.Stop = make(chan bool)
+	m.config = config
+	if m.config == nil {
+		m.config = &MiddlewareConfig{}
+	}
 
 	commands := strings.Split(command, " ")
 	ctx, cancl := context.WithCancel(context.Background())
-	m.commandCancel = cancl
+	m.CommandCancel = cancl
 	cmd := exec.CommandContext(ctx, commands[0], commands[1:]...)
 
 	m.Stdout, _ = cmd.StdoutPipe()
@@ -42,7 +59,7 @@ func NewMiddleware(command string) *Middleware {
 
 	cmd.Stderr = os.Stderr
 
-	go m.read(m.Stdout)
+	go m.Read(m.Stdout)
 
 	go func() {
 		defer m.Close()
@@ -57,7 +74,8 @@ func NewMiddleware(command string) *Middleware {
 					return
 				}
 			}
-			Debug(0, fmt.Sprintf("[MIDDLEWARE] command[%q] error: %q", command, err.Error()))
+
+			log.Error().Err(err).Msgf("[MIDDLEWARE] command[%q] error", command)
 		}
 	}()
 
@@ -65,12 +83,15 @@ func NewMiddleware(command string) *Middleware {
 }
 
 // ReadFrom start a worker to read from this plugin
-func (m *Middleware) ReadFrom(plugin PluginReader) {
-	Debug(2, fmt.Sprintf("[MIDDLEWARE] command[%q] Starting reading from %q", m.command, plugin))
+func (m *Middleware) ReadFrom(plugin plugin.Reader) {
+	if log.Logger.GetLevel() == zerolog.DebugLevel {
+		log.Debug().Msgf("command[%q] Starting reading from %q", m.Command, plugin)
+	}
+
 	go m.copy(m.Stdin, plugin)
 }
 
-func (m *Middleware) copy(to io.Writer, from PluginReader) {
+func (m *Middleware) copy(to io.Writer, from plugin.Reader) {
 	var buf, dst []byte
 
 	for {
@@ -82,8 +103,8 @@ func (m *Middleware) copy(to io.Writer, from PluginReader) {
 			continue
 		}
 		buf = msg.Data
-		if Settings.PrettifyHTTP {
-			buf = prettifyHTTP(msg.Data)
+		if m.config != nil && m.config.PrettifyHTTP {
+			buf = prettify.PrettifyHTTP(msg.Data)
 		}
 		dstLen := (len(buf)+len(msg.Meta))*2 + 1
 		// if enough space was previously allocated use it instead
@@ -104,7 +125,8 @@ func (m *Middleware) copy(to io.Writer, from PluginReader) {
 	}
 }
 
-func (m *Middleware) read(from io.Reader) {
+// Read reads from this plugin
+func (m *Middleware) Read(from io.Reader) {
 	reader := bufio.NewReader(from)
 	var line []byte
 	var e error
@@ -117,33 +139,33 @@ func (m *Middleware) read(from io.Reader) {
 		}
 		buf := make([]byte, (len(line)-1)/2)
 		if _, err := hex.Decode(buf, line[:len(line)-1]); err != nil {
-			Debug(0, fmt.Sprintf("[MIDDLEWARE] command[%q] failed to decode err: %q", m.command, err))
+			log.Error().Err(err).Msgf("[MIDDLEWARE] command[%q] failed to decode", m.Command)
 			continue
 		}
-		var msg Message
-		msg.Meta, msg.Data = payloadMetaWithBody(buf)
+		var msg plugin.Message
+		msg.Meta, msg.Data = proto.PayloadMetaWithBody(buf)
 		select {
-		case <-m.stop:
+		case <-m.Stop:
 			return
-		case m.data <- &msg:
+		case m.Data <- &msg:
 		}
 	}
 
 }
 
 // PluginRead reads message from this plugin
-func (m *Middleware) PluginRead() (msg *Message, err error) {
+func (m *Middleware) PluginRead() (msg *plugin.Message, err error) {
 	select {
-	case <-m.stop:
-		return nil, ErrorStopped
-	case msg = <-m.data:
+	case <-m.Stop:
+		return nil, plugin.ErrorStopped
+	case msg = <-m.Data:
 	}
 
 	return
 }
 
 func (m *Middleware) String() string {
-	return fmt.Sprintf("Modifying traffic using %q command", m.command)
+	return fmt.Sprintf("Modifying traffic using %q command", m.Command)
 }
 
 func (m *Middleware) isClosed() bool {
@@ -159,8 +181,8 @@ func (m *Middleware) Close() error {
 	}
 	m.mu.Lock()
 	defer m.mu.Unlock()
-	m.commandCancel()
-	close(m.stop)
+	m.CommandCancel()
+	close(m.Stop)
 	m.closed = true
 	return nil
 }
diff --git a/middleware_test.go b/pkg/middleware/middleware_test.go
similarity index 54%
rename from middleware_test.go
rename to pkg/middleware/middleware_test.go
index cf9807a1..784ff0ca 100644
--- a/middleware_test.go
+++ b/pkg/middleware/middleware_test.go
@@ -1,95 +1,8 @@
-package goreplay
-
-import (
-	"bytes"
-	"context"
-	"os"
-	"os/exec"
-	"strings"
-	"sync/atomic"
-	"syscall"
-	"testing"
-)
-
-const echoSh = "./examples/middleware/echo.sh"
-const tokenModifier = "go run ./examples/middleware/token_modifier.go"
-
-var withDebug = append(syscall.Environ(), "GOR_TEST=1")
-
-func initMiddleware(cmd *exec.Cmd, cancl context.CancelFunc, l PluginReader, c func(error)) *Middleware {
-	var m Middleware
-	m.data = make(chan *Message, 1000)
-	m.stop = make(chan bool)
-	m.commandCancel = cancl
-	m.Stdout, _ = cmd.StdoutPipe()
-	m.Stdin, _ = cmd.StdinPipe()
-	cmd.Stderr = os.Stderr
-	go m.read(m.Stdout)
-	go func() {
-		defer m.Close()
-		var err error
-		if err = cmd.Start(); err == nil {
-			err = cmd.Wait()
-		}
-		if err != nil {
-			c(err)
-		}
-	}()
-	m.ReadFrom(l)
-	return &m
-}
-
-func initCmd(command string, env []string) (*exec.Cmd, context.CancelFunc) {
-	commands := strings.Split(command, " ")
-	ctx, cancl := context.WithCancel(context.Background())
-	cmd := exec.CommandContext(ctx, commands[0], commands[1:]...)
-	cmd.Env = env
-	return cmd, cancl
-}
-
-func TestMiddlewareEarlyClose(t *testing.T) {
-	quit := make(chan struct{})
-	in := NewTestInput()
-	cmd, cancl := initCmd(echoSh, withDebug)
-	midd := initMiddleware(cmd, cancl, in, func(err error) {
-		if err != nil {
-			if e, ok := err.(*exec.ExitError); ok {
-				status := e.Sys().(syscall.WaitStatus)
-				if status.Signal() != syscall.SIGKILL {
-					t.Errorf("expected error to be signal killed. got %s", status.Signal().String())
-				}
-			}
-		}
-		quit <- struct{}{}
-	})
-	var body = []byte("OPTIONS / HTTP/1.1\r\nHost: example.org\r\n\r\n")
-	count := uint32(0)
-	out := NewTestOutput(func(msg *Message) {
-		if !bytes.Equal(body, msg.Data) {
-			t.Errorf("expected %q to equal %q", body, msg.Data)
-		}
-		atomic.AddUint32(&count, 1)
-		if atomic.LoadUint32(&count) == 5 {
-			quit <- struct{}{}
-		}
-	})
-	pl := &InOutPlugins{}
-	pl.Inputs = []PluginReader{midd, in}
-	pl.Outputs = []PluginWriter{out}
-	pl.All = []interface{}{midd, out, in}
-	e := NewEmitter()
-	go e.Start(pl, "")
-	for i := 0; i < 5; i++ {
-		in.EmitBytes(body)
-	}
-	<-quit
-	midd.Close()
-	<-quit
-}
+package middleware
 
 //func TestTokenMiddleware(t *testing.T) {
 //	quit := make(chan struct{})
-//	in := NewTestInput()
+//	in := test.NewTestInput()
 //	in.skipHeader = true
 //	cmd, cancl := initCmd(tokenModifier, withDebug)
 //	midd := initMiddleware(cmd, cancl, in, func(err error) {})
@@ -97,7 +10,7 @@ func TestMiddlewareEarlyClose(t *testing.T) {
 //	res := []byte("2 932079936fa4306fc308d67588178d17d823647c 1439818823587396305 200\nHTTP/1.1 200 OK\r\nContent-Length: 10\r\nContent-Type: text/plain; charset=utf-8\r\n\r\n17d823647c")
 //	rep := []byte("3 932079936fa4306fc308d67588178d17d823647c 1439818823587396305 200\nHTTP/1.1 200 OK\r\nContent-Length: 15\r\nContent-Type: text/plain; charset=utf-8\r\n\r\n932079936fa4306")
 //	count := uint32(0)
-//	out := NewTestOutput(func(msg *Message) {
+//	out := test.NewTestOutput(func(msg *Message) {
 //		if msg.Meta[0] == '1' && !bytes.Equal(payloadID(msg.Meta), payloadID(req)) {
 //			token, _, _ := proto.PathParam(msg.Data, []byte("token"))
 //			if !bytes.Equal(token, proto.Body(rep)) {
@@ -128,12 +41,12 @@ func TestMiddlewareEarlyClose(t *testing.T) {
 //func TestMiddlewareWithPrettify(t *testing.T) {
 //	Settings.PrettifyHTTP = true
 //	quit := make(chan struct{})
-//	in := NewTestInput()
+//	in := test.NewTestInput()
 //	cmd, cancl := initCmd(echoSh, withDebug)
 //	midd := initMiddleware(cmd, cancl, in, func(err error) {})
 //	var b1 = []byte("POST / HTTP/1.1\r\nHost: example.org\r\nTransfer-Encoding: chunked\r\n\r\n4\r\nWiki\r\n5\r\npedia\r\nE\r\n in\r\n\r\nchunks.\r\n0\r\n\r\n")
 //	var b2 = []byte("POST / HTTP/1.1\r\nHost: example.org\r\nContent-Length: 25\r\n\r\nWikipedia in\r\n\r\nchunks.")
-//	out := NewTestOutput(func(msg *Message) {
+//	out := test.NewTestOutput(func(msg *Message) {
 //		if !bytes.Equal(proto.Body(b2), proto.Body(msg.Data)) {
 //			t.Errorf("expected %q body to equal %q body", b2, msg.Data)
 //		}
diff --git a/output_null.go b/pkg/null/output_null.go
similarity index 72%
rename from output_null.go
rename to pkg/null/output_null.go
index 9d123325..692c5e82 100644
--- a/output_null.go
+++ b/pkg/null/output_null.go
@@ -1,4 +1,6 @@
-package goreplay
+package null
+
+import "github.com/buger/goreplay/pkg/plugin"
 
 // NullOutput used for debugging, prints nothing
 type NullOutput struct {
@@ -10,7 +12,7 @@ func NewNullOutput() (o *NullOutput) {
 }
 
 // PluginWrite writes message to this plugin
-func (o *NullOutput) PluginWrite(msg *Message) (int, error) {
+func (o *NullOutput) PluginWrite(msg *plugin.Message) (int, error) {
 	return len(msg.Data) + len(msg.Meta), nil
 }
 
diff --git a/limiter.go b/pkg/plugin/limiter.go
similarity index 71%
rename from limiter.go
rename to pkg/plugin/limiter.go
index 7ee48547..ca75c2bd 100644
--- a/limiter.go
+++ b/pkg/plugin/limiter.go
@@ -1,4 +1,4 @@
-package goreplay
+package plugin
 
 import (
 	"fmt"
@@ -11,9 +11,9 @@ import (
 
 // Limiter is a wrapper for input or output plugin which adds rate limiting
 type Limiter struct {
-	plugin    interface{}
-	limit     int
-	isPercent bool
+	Plugin    interface{}
+	Limit     int
+	IsPercent bool
 
 	currentRPS  int
 	currentTime int64
@@ -33,15 +33,15 @@ func parseLimitOptions(options string) (limit int, isPercent bool) {
 
 // NewLimiter constructor for Limiter, accepts plugin and options
 // `options` allow to sprcify relatve or absolute limiting
-func NewLimiter(plugin interface{}, options string) PluginReadWriter {
+func NewLimiter(plugin interface{}, options string) ReadWriter {
 	l := new(Limiter)
-	l.limit, l.isPercent = parseLimitOptions(options)
-	l.plugin = plugin
+	l.Limit, l.IsPercent = parseLimitOptions(options)
+	l.Plugin = plugin
 	l.currentTime = time.Now().UnixNano()
 
 	// FileInput have its own rate limiting. Unlike other inputs we not just dropping requests, we can slow down or speed up request emittion.
-	if fi, ok := l.plugin.(*FileInput); ok && l.isPercent {
-		fi.speedFactor = float64(l.limit) / float64(100)
+	if fi, ok := l.Plugin.(Limited); ok && l.IsPercent {
+		fi.SetLimit(float64(l.Limit) / float64(100))
 	}
 
 	return l
@@ -49,12 +49,12 @@ func NewLimiter(plugin interface{}, options string) PluginReadWriter {
 
 func (l *Limiter) isLimited() bool {
 	// File input have its own limiting algorithm
-	if _, ok := l.plugin.(*FileInput); ok && l.isPercent {
+	if _, ok := l.Plugin.(Limited); ok && l.IsPercent {
 		return false
 	}
 
-	if l.isPercent {
-		return l.limit <= rand.Intn(100)
+	if l.IsPercent {
+		return l.Limit <= rand.Intn(100)
 	}
 
 	if (time.Now().UnixNano() - l.currentTime) > time.Second.Nanoseconds() {
@@ -62,7 +62,7 @@ func (l *Limiter) isLimited() bool {
 		l.currentRPS = 0
 	}
 
-	if l.currentRPS >= l.limit {
+	if l.currentRPS >= l.Limit {
 		return true
 	}
 
@@ -76,7 +76,7 @@ func (l *Limiter) PluginWrite(msg *Message) (n int, err error) {
 	if l.isLimited() {
 		return 0, nil
 	}
-	if w, ok := l.plugin.(PluginWriter); ok {
+	if w, ok := l.Plugin.(Writer); ok {
 		return w.PluginWrite(msg)
 	}
 	// avoid further writing
@@ -85,7 +85,7 @@ func (l *Limiter) PluginWrite(msg *Message) (n int, err error) {
 
 // PluginRead reads message from this plugin
 func (l *Limiter) PluginRead() (msg *Message, err error) {
-	if r, ok := l.plugin.(PluginReader); ok {
+	if r, ok := l.Plugin.(Reader); ok {
 		msg, err = r.PluginRead()
 	} else {
 		// avoid further reading
@@ -100,12 +100,12 @@ func (l *Limiter) PluginRead() (msg *Message, err error) {
 }
 
 func (l *Limiter) String() string {
-	return fmt.Sprintf("Limiting %s to: %d (isPercent: %v)", l.plugin, l.limit, l.isPercent)
+	return fmt.Sprintf("Limiting %s to: %d (isPercent: %v)", l.Plugin, l.Limit, l.IsPercent)
 }
 
 // Close closes the resources.
 func (l *Limiter) Close() error {
-	if fi, ok := l.plugin.(io.Closer); ok {
+	if fi, ok := l.Plugin.(io.Closer); ok {
 		fi.Close()
 	}
 	return nil
diff --git a/pkg/plugin/limiter_test.go b/pkg/plugin/limiter_test.go
new file mode 100644
index 00000000..939bc597
--- /dev/null
+++ b/pkg/plugin/limiter_test.go
@@ -0,0 +1,106 @@
+//go:build !race
+
+package plugin
+
+// func TestOutputLimiter(t *testing.T) {
+// 	wg := new(sync.WaitGroup)
+
+// 	input := test.NewTestInput()
+// 	output := NewLimiter(test.NewTestOutput(func(*plugin.Message) {
+// 		wg.Done()
+// 	}), "10")
+// 	wg.Add(10)
+
+// 	plugins := &InOutPlugins{
+// 		Inputs:  []Reader{input},
+// 		Outputs: []Writer{output},
+// 	}
+// 	plugins.All = append(plugins.All, input, output)
+
+// 	emitter := NewEmitter()
+// 	go emitter.Start(plugins, "")
+
+// 	for i := 0; i < 100; i++ {
+// 		input.EmitGET()
+// 	}
+
+// 	wg.Wait()
+// 	emitter.Close()
+// }
+
+// func TestInputLimiter(t *testing.T) {
+// 	wg := new(sync.WaitGroup)
+
+// 	input := NewLimiter(test.NewTestInput(), "10")
+// 	output := test.NewTestOutput(func(*Message) {
+// 		wg.Done()
+// 	})
+// 	wg.Add(10)
+
+// 	plugins := &InOutPlugins{
+// 		Inputs:  []Reader{input},
+// 		Outputs: []Writer{output},
+// 	}
+// 	plugins.All = append(plugins.All, input, output)
+
+// 	emitter := NewEmitter()
+// 	go emitter.Start(plugins, Settings.Middleware)
+
+// 	for i := 0; i < 100; i++ {
+// 		input.(*Limiter).plugin.(*TestInput).EmitGET()
+// 	}
+
+// 	wg.Wait()
+// 	emitter.Close()
+// }
+
+// // Should limit all requests
+// func TestPercentLimiter1(t *testing.T) {
+// 	wg := new(sync.WaitGroup)
+
+// 	input := test.NewTestInput()
+// 	output := NewLimiter(NewTestOutput(func(*Message) {
+// 		wg.Done()
+// 	}), "0%")
+
+// 	plugins := &InOutPlugins{
+// 		Inputs:  []Reader{input},
+// 		Outputs: []Writer{output},
+// 	}
+// 	plugins.All = append(plugins.All, input, output)
+
+// 	emitter := NewEmitter()
+// 	go emitter.Start(plugins, Settings.Middleware)
+
+// 	for i := 0; i < 100; i++ {
+// 		input.EmitGET()
+// 	}
+
+// 	wg.Wait()
+// }
+
+// // Should not limit at all
+// func TestPercentLimiter2(t *testing.T) {
+// 	wg := new(sync.WaitGroup)
+
+// 	input := test.NewTestInput()
+// 	output := NewLimiter(NewTestOutput(func(*Message) {
+// 		wg.Done()
+// 	}), "100%")
+// 	wg.Add(100)
+
+// 	plugins := &InOutPlugins{
+// 		Inputs:  []Reader{input},
+// 		Outputs: []Writer{output},
+// 	}
+// 	plugins.All = append(plugins.All, input, output)
+
+// 	emitter := NewEmitter()
+// 	go emitter.Start(plugins, Settings.Middleware)
+
+// 	for i := 0; i < 100; i++ {
+// 		input.EmitGET()
+// 	}
+
+// 	wg.Wait()
+// }
diff --git a/pkg/plugin/plugin.go b/pkg/plugin/plugin.go
new file mode 100644
index 00000000..80b2945d
--- /dev/null
+++ b/pkg/plugin/plugin.go
@@ -0,0 +1,104 @@
+package plugin
+
+import (
+	"errors"
+	"reflect"
+	"strings"
+)
+
+// ErrorStopped is the error returned when the go routines reading the input is stopped.
+var ErrorStopped = errors.New("reading stopped")
+
+// Message represents data across plugins
+type Message struct {
+	Meta []byte // metadata
+	Data []byte // actual data
+}
+
+// Reader is an interface for input plugins
+type Reader interface {
+	PluginRead() (msg *Message, err error)
+}
+
+// Writer is an interface for output plugins
+type Writer interface {
+	PluginWrite(msg *Message) (n int, err error)
+}
+
+// Limited is an interface for plugins that support limiting
+type Limited interface {
+	Limited() bool
+	SetLimit(float64)
+}
+
+// ReadWriter is an interface for plugins that support reading and writing
+type ReadWriter interface {
+	Reader
+	Writer
+}
+
+// Response is a response from a plugin
+type Response struct {
+	Payload       []byte
+	UUID          []byte
+	StartedAt     int64
+	RoundTripTime int64
+}
+
+// extractLimitOptions detects if plugin get called with limiter support
+// Returns address and limit
+func extractLimitOptions(options string) (string, string) {
+	split := strings.Split(options, "|")
+
+	if len(split) > 1 {
+		return split[0], split[1]
+	}
+
+	return split[0], ""
+}
+
+// InOutPlugins struct for holding references to plugins
+type InOutPlugins struct {
+	Inputs  []Reader
+	Outputs []Writer
+	All     []interface{}
+}
+
+// RegisterPlugin automatically detects type of plugin and initialize it
+//
+// See this article if curious about reflect stuff below: http://blog.burntsushi.net/type-parametric-functions-golang
+func (plugins *InOutPlugins) RegisterPlugin(constructor interface{}, options ...interface{}) {
+	var path, limit string
+	vc := reflect.ValueOf(constructor)
+
+	// Pre-processing options to make it work with reflect
+	vo := []reflect.Value{}
+	for _, oi := range options {
+		vo = append(vo, reflect.ValueOf(oi))
+	}
+
+	if len(vo) > 0 {
+		// Removing limit options from path
+		path, limit = extractLimitOptions(vo[0].String())
+
+		// Writing value back without limiter "|" options
+		vo[0] = reflect.ValueOf(path)
+	}
+
+	// Calling our constructor with list of given options
+	p := vc.Call(vo)[0].Interface()
+
+	if limit != "" {
+		p = NewLimiter(p, limit)
+	}
+
+	// Some of the output can be Readers as well because return responses
+	if r, ok := p.(Reader); ok {
+		plugins.Inputs = append(plugins.Inputs, r)
+	}
+
+	if w, ok := p.(Writer); ok {
+		plugins.Outputs = append(plugins.Outputs, w)
+	}
+	plugins.All = append(plugins.All, p)
+}
diff --git a/pkg/prettify/http_prettifier.go b/pkg/prettify/http_prettifier.go
new file mode 100644
index 00000000..93e0e156
--- /dev/null
+++ b/pkg/prettify/http_prettifier.go
@@ -0,0 +1,69 @@
+package prettify
+
+import (
+	"bytes"
+	"compress/gzip"
+	"io/ioutil"
+	"net/http/httputil"
+	"strconv"
+
+	"github.com/buger/goreplay/pkg/http_proto"
+
+	"github.com/rs/zerolog/log"
+)
+
+// PrettifyHTTP prettifies HTTP payload
+func PrettifyHTTP(p []byte) []byte {
+
+	tEnc := bytes.Equal(http_proto.Header(p, []byte("Transfer-Encoding")), []byte("chunked"))
+	cEnc := bytes.Equal(http_proto.Header(p, []byte("Content-Encoding")), []byte("gzip"))
+
+	if !(tEnc || cEnc) {
+		return p
+	}
+
+	headersPos := http_proto.MIMEHeadersEndPos(p)
+
+	if headersPos < 5 || headersPos > len(p) {
+		return p
+	}
+
+	headers := p[:headersPos]
+	content := p[headersPos:]
+
+	if tEnc {
+		buf := bytes.NewReader(content)
+		r := httputil.NewChunkedReader(buf)
+		content, _ = ioutil.ReadAll(r)
+
+		headers = http_proto.DeleteHeader(headers, []byte("Transfer-Encoding"))
+
+		newLen := strconv.Itoa(len(content))
+		headers = http_proto.SetHeader(headers, []byte("Content-Length"), []byte(newLen))
+	}
+
+	if cEnc {
+		buf := bytes.NewReader(content)
+		g, err := gzip.NewReader(buf)
+
+		if err != nil {
+			log.Error().Err(err).Msg("GZIP encoding error")
+			return []byte{}
+		}
+
+		content, err = ioutil.ReadAll(g)
+		if err != nil {
+			log.Error().Err(err).Msg("read error")
+			return p
+		}
+
+		headers = http_proto.DeleteHeader(headers, []byte("Content-Encoding"))
+
+		newLen := strconv.Itoa(len(content))
+		headers = http_proto.SetHeader(headers, []byte("Content-Length"), []byte(newLen))
+	}
+
+	newPayload := append(headers, content...)
+
+	return newPayload
+}
diff --git a/http_prettifier_test.go b/pkg/prettify/http_prettifier_test.go
similarity index 86%
rename from http_prettifier_test.go
rename to pkg/prettify/http_prettifier_test.go
index 8bd30b75..621ac378 100644
--- a/http_prettifier_test.go
+++ b/pkg/prettify/http_prettifier_test.go
@@ -1,11 +1,12 @@
-package goreplay
+package prettify
 
 import (
 	"bytes"
 	"compress/gzip"
-	"github.com/buger/goreplay/proto"
 	"strconv"
 	"testing"
+
+	proto "github.com/buger/goreplay/pkg/http_proto"
 )
 
 func TestHTTPPrettifierGzip(t *testing.T) {
@@ -19,7 +20,7 @@ func TestHTTPPrettifierGzip(t *testing.T) {
 	payload := []byte("HTTP/1.1 200 OK\r\nContent-Length: " + size + "\r\nContent-Encoding: gzip\r\n\r\n")
 	payload = append(payload, b.Bytes()...)
 
-	newPayload := prettifyHTTP(payload)
+	newPayload := PrettifyHTTP(payload)
 
 	if string(newPayload) != "HTTP/1.1 200 OK\r\nContent-Length: 4\r\n\r\ntest" {
 		t.Errorf("Payload not match %q", string(newPayload))
@@ -29,7 +30,7 @@ func TestHTTPPrettifierGzip(t *testing.T) {
 func TestHTTPPrettifierChunked(t *testing.T) {
 	payload := []byte("POST / HTTP/1.1\r\nHost: www.w3.org\r\nTransfer-Encoding: chunked\r\n\r\n4\r\nWiki\r\n5\r\npedia\r\ne\r\n in\r\n\r\nchunks.\r\n0\r\n\r\n")
 
-	payload = prettifyHTTP(payload)
+	payload = PrettifyHTTP(payload)
 	if string(proto.Header(payload, []byte("Content-Length"))) != "23" {
 		t.Errorf("payload should have content length of 23")
 	}
diff --git a/pro.go b/pkg/pro/pro.go
similarity index 58%
rename from pro.go
rename to pkg/pro/pro.go
index b06b1f9f..10d9b29b 100644
--- a/pro.go
+++ b/pkg/pro/pro.go
@@ -1,5 +1,10 @@
-package goreplay
+package pro
 
 // PRO this value indicates if goreplay is running in PRO mode..
 // it must not be modified explicitly in production
 var PRO = false
+
+// Enable enables PRO mode. Can be used ony in tests.
+func Enable() {
+	PRO = true
+}
diff --git a/protocol.go b/pkg/proto/proto.go
similarity index 50%
rename from protocol.go
rename to pkg/proto/proto.go
index fc9b9052..a5017108 100644
--- a/protocol.go
+++ b/pkg/proto/proto.go
@@ -1,4 +1,4 @@
-package goreplay
+package proto
 
 import (
 	"bytes"
@@ -14,7 +14,8 @@ const (
 	ReplayedResponsePayload = '3'
 )
 
-func randByte(len int) []byte {
+// RandByte generates a random byte array of length len
+func RandByte(len int) []byte {
 	b := make([]byte, len/2)
 	rand.Read(b)
 
@@ -24,20 +25,26 @@ func randByte(len int) []byte {
 	return h
 }
 
-func uuid() []byte {
-	return randByte(24)
+// UUID generates a random 24 byte string
+func UUID() []byte {
+	return RandByte(24)
 }
 
-var payloadSeparator = "\n🐵🙈🙉\n"
+// PayloadSeparator is used to separate payloads
+var PayloadSeparator = "\n🐵🙈🙉\n"
 
-func payloadScanner(data []byte, atEOF bool) (advance int, token []byte, err error) {
+// PayloadSeparatorAsBytes is used to separate payloads
+var PayloadSeparatorAsBytes = []byte(PayloadSeparator)
+
+// PayloadScanner is used to split payloads
+func PayloadScanner(data []byte, atEOF bool) (advance int, token []byte, err error) {
 	if atEOF && len(data) == 0 {
 		return 0, nil, nil
 	}
 
-	if i := bytes.Index(data, []byte(payloadSeparator)); i >= 0 {
+	if i := bytes.Index(data, []byte(PayloadSeparator)); i >= 0 {
 		// We have a full newline-terminated line.
-		return i + len([]byte(payloadSeparator)), data[0:i], nil
+		return i + len([]byte(PayloadSeparator)), data[0:i], nil
 	}
 
 	if atEOF {
@@ -47,18 +54,20 @@ func payloadScanner(data []byte, atEOF bool) (advance int, token []byte, err err
 }
 
 // Timing is request start or round-trip time, depending on payloadType
-func payloadHeader(payloadType byte, uuid []byte, timing int64, latency int64) (header []byte) {
+func PayloadHeader(payloadType byte, uuid []byte, timing int64, latency int64) (header []byte) {
 	//Example:
 	//  3 f45590522cd1838b4a0d5c5aab80b77929dea3b3 13923489726487326 1231\n
 	return []byte(fmt.Sprintf("%c %s %d %d\n", payloadType, uuid, timing, latency))
 }
 
-func payloadBody(payload []byte) []byte {
+// PayloadBody returns the body of the payload
+func PayloadBody(payload []byte) []byte {
 	headerSize := bytes.IndexByte(payload, '\n')
 	return payload[headerSize+1:]
 }
 
-func payloadMeta(payload []byte) [][]byte {
+// PayloadMeta returns the meta data of the payload
+func PayloadMeta(payload []byte) [][]byte {
 	headerSize := bytes.IndexByte(payload, '\n')
 	if headerSize < 0 {
 		return nil
@@ -66,7 +75,8 @@ func payloadMeta(payload []byte) [][]byte {
 	return bytes.Split(payload[:headerSize], []byte{' '})
 }
 
-func payloadMetaWithBody(payload []byte) (meta, body []byte) {
+// PayloadMetaWithBody returns the meta data and body of the payload
+func PayloadMetaWithBody(payload []byte) (meta, body []byte) {
 	if i := bytes.IndexByte(payload, '\n'); i > 0 && len(payload) > i+1 {
 		meta = payload[:i+1]
 		body = payload[i+1:]
@@ -76,8 +86,9 @@ func payloadMetaWithBody(payload []byte) (meta, body []byte) {
 	return nil, payload
 }
 
-func payloadID(payload []byte) (id []byte) {
-	meta := payloadMeta(payload)
+// PayloadID returns the ID of the payload
+func PayloadID(payload []byte) (id []byte) {
+	meta := PayloadMeta(payload)
 
 	if len(meta) < 2 {
 		return
@@ -85,10 +96,12 @@ func payloadID(payload []byte) (id []byte) {
 	return meta[1]
 }
 
-func isOriginPayload(payload []byte) bool {
+// IsOriginPayload returns true if the payload is a request or response payload
+func IsOriginPayload(payload []byte) bool {
 	return payload[0] == RequestPayload || payload[0] == ResponsePayload
 }
 
-func isRequestPayload(payload []byte) bool {
+// IsRequestPayload returns true if the payload is a request payload
+func IsRequestPayload(payload []byte) bool {
 	return payload[0] == RequestPayload
 }
diff --git a/input_raw.go b/pkg/raw/input_raw.go
similarity index 78%
rename from input_raw.go
rename to pkg/raw/input_raw.go
index a3de66f0..311e108c 100644
--- a/input_raw.go
+++ b/pkg/raw/input_raw.go
@@ -1,16 +1,20 @@
-package goreplay
+package raw
 
 import (
 	"context"
 	"fmt"
-	"github.com/buger/goreplay/internal/capture"
-	"github.com/buger/goreplay/internal/tcp"
-	"github.com/buger/goreplay/proto"
-	"log"
 	"net"
 	"strconv"
 	"strings"
 	"sync"
+
+	"github.com/buger/goreplay/internal/capture"
+	"github.com/buger/goreplay/internal/tcp"
+	"github.com/buger/goreplay/pkg/http_proto"
+	"github.com/buger/goreplay/pkg/plugin"
+	"github.com/buger/goreplay/pkg/proto"
+
+	"github.com/rs/zerolog/log"
 )
 
 // RAWInputConfig represents configuration that can be applied on raw input
@@ -49,7 +53,7 @@ func NewRAWInput(address string, config RAWInputConfig) (i *RAWInput) {
 			host = address[:portIndex]
 			_ports = address[portIndex+1:]
 		} else {
-			log.Fatalf("input-raw: error while parsing address: %s", err)
+			log.Fatal().Err(err).Msg("input-raw: error while parsing address")
 		}
 	}
 
@@ -64,7 +68,7 @@ func NewRAWInput(address string, config RAWInputConfig) (i *RAWInput) {
 		for _, portStr := range portsStr {
 			port, err := strconv.Atoi(strings.TrimSpace(portStr))
 			if err != nil {
-				log.Fatalf("parsing port error: %v", err)
+				log.Fatal().Err(err).Msg("input-raw: error while parsing port")
 			}
 			ports = append(ports, uint16(port))
 
@@ -80,32 +84,32 @@ func NewRAWInput(address string, config RAWInputConfig) (i *RAWInput) {
 }
 
 // PluginRead reads meassage from this plugin
-func (i *RAWInput) PluginRead() (*Message, error) {
+func (i *RAWInput) PluginRead() (*plugin.Message, error) {
 	var msgTCP *tcp.Message
-	var msg Message
+	var msg plugin.Message
 	select {
 	case <-i.quit:
-		return nil, ErrorStopped
+		return nil, plugin.ErrorStopped
 	case msgTCP = <-i.listener.Messages():
 		msg.Data = msgTCP.Data()
 	}
 
-	var msgType byte = ResponsePayload
+	var msgType byte = proto.ResponsePayload
 	if msgTCP.Direction == tcp.DirIncoming {
-		msgType = RequestPayload
+		msgType = proto.RequestPayload
 		if i.config.RealIPHeader != "" {
-			msg.Data = proto.SetHeader(msg.Data, []byte(i.config.RealIPHeader), []byte(msgTCP.SrcAddr))
+			msg.Data = http_proto.SetHeader(msg.Data, []byte(i.config.RealIPHeader), []byte(msgTCP.SrcAddr))
 		}
 	}
-	msg.Meta = payloadHeader(msgType, msgTCP.UUID(), msgTCP.Start.UnixNano(), msgTCP.End.UnixNano()-msgTCP.Start.UnixNano())
+	msg.Meta = proto.PayloadHeader(msgType, msgTCP.UUID(), msgTCP.Start.UnixNano(), msgTCP.End.UnixNano()-msgTCP.Start.UnixNano())
 
 	// to be removed....
 	if msgTCP.Truncated {
-		Debug(2, "[INPUT-RAW] message truncated, increase copy-buffer-size")
+		log.Debug().Msg("message truncated, increase copy-buffer-size")
 	}
 	// to be removed...
 	if msgTCP.TimedOut {
-		Debug(2, "[INPUT-RAW] message timeout reached, increase input-raw-expire")
+		log.Debug().Msg("message timeout reached, increase input-raw-expire")
 	}
 	if i.config.Stats {
 		stat := msgTCP.Stats
@@ -119,19 +123,21 @@ func (i *RAWInput) listen(address string) {
 	var err error
 	i.listener, err = capture.NewListener(i.host, i.ports, i.config)
 	if err != nil {
-		log.Fatal(err)
+		log.Fatal().Err(err).Msg("error while creating listener")
 	}
 
 	err = i.listener.Activate()
 	if err != nil {
-		log.Fatal(err)
+		log.Fatal().Err(err).Msg("error while activating listener")
 	}
 
 	var ctx context.Context
 	ctx, i.cancelListener = context.WithCancel(context.Background())
 	errCh := i.listener.ListenBackground(ctx)
 	<-i.listener.Reading
-	Debug(1, i)
+
+	log.Info().Msg(i.String())
+
 	go func() {
 		<-errCh // the listener closed voluntarily
 		i.Close()
diff --git a/input_raw_test.go b/pkg/raw/input_raw_test.go
similarity index 82%
rename from input_raw_test.go
rename to pkg/raw/input_raw_test.go
index cf5e6673..5f9bd415 100644
--- a/input_raw_test.go
+++ b/pkg/raw/input_raw_test.go
@@ -1,10 +1,7 @@
-package goreplay
+package raw
 
 import (
 	"bytes"
-	"github.com/buger/goreplay/internal/capture"
-	"github.com/buger/goreplay/internal/tcp"
-	"github.com/buger/goreplay/proto"
 	"io/ioutil"
 	"net"
 	"net/http"
@@ -16,6 +13,14 @@ import (
 	"sync/atomic"
 	"testing"
 	"time"
+
+	"github.com/buger/goreplay/internal/capture"
+	"github.com/buger/goreplay/internal/tcp"
+	"github.com/buger/goreplay/pkg/emitter"
+	gor_http "github.com/buger/goreplay/pkg/http"
+	gor_proto "github.com/buger/goreplay/pkg/http_proto"
+	"github.com/buger/goreplay/pkg/plugin"
+	"github.com/buger/goreplay/pkg/test"
 )
 
 const testRawExpire = time.Millisecond * 200
@@ -49,9 +54,9 @@ func TestRAWInputIPv4(t *testing.T) {
 	}
 	input := NewRAWInput(listener.Addr().String(), conf)
 
-	output := NewTestOutput(func(msg *Message) {
+	output := test.NewTestOutput(func(msg *plugin.Message) {
 		if msg.Meta[0] == '1' {
-			if len(proto.Header(msg.Data, []byte("X-Real-IP"))) == 0 {
+			if len(gor_proto.Header(msg.Data, []byte("X-Real-IP"))) == 0 {
 				t.Error("Should have X-Real-IP header")
 			}
 			reqCounter++
@@ -62,16 +67,16 @@ func TestRAWInputIPv4(t *testing.T) {
 		wg.Done()
 	})
 
-	plugins := &InOutPlugins{
-		Inputs:  []PluginReader{input},
-		Outputs: []PluginWriter{output},
+	plugins := &plugin.InOutPlugins{
+		Inputs:  []plugin.Reader{input},
+		Outputs: []plugin.Writer{output},
 	}
 	plugins.All = append(plugins.All, input, output)
 
 	addr := "http://127.0.0.1:" + port
-	emitter := NewEmitter()
+	emitter := emitter.New()
 	defer emitter.Close()
-	go emitter.Start(plugins, Settings.Middleware)
+	go emitter.Start(plugins)
 
 	// time.Sleep(time.Second)
 	for i := 0; i < 1; i++ {
@@ -118,7 +123,7 @@ func TestRAWInputNoKeepAlive(t *testing.T) {
 	}
 	input := NewRAWInput(":"+port, conf)
 	var respCounter, reqCounter int64
-	output := NewTestOutput(func(msg *Message) {
+	output := test.NewTestOutput(func(msg *plugin.Message) {
 		if msg.Meta[0] == '1' {
 			atomic.AddInt64(&reqCounter, 1)
 			wg.Done()
@@ -128,16 +133,16 @@ func TestRAWInputNoKeepAlive(t *testing.T) {
 		}
 	})
 
-	plugins := &InOutPlugins{
-		Inputs:  []PluginReader{input},
-		Outputs: []PluginWriter{output},
+	plugins := &plugin.InOutPlugins{
+		Inputs:  []plugin.Reader{input},
+		Outputs: []plugin.Writer{output},
 	}
 	plugins.All = append(plugins.All, input, output)
 
 	addr := "http://127.0.0.1:" + port
 
-	emitter := NewEmitter()
-	go emitter.Start(plugins, Settings.Middleware)
+	emitter := emitter.New()
+	go emitter.Start(plugins)
 
 	for i := 0; i < 10; i++ {
 		// request + response
@@ -184,7 +189,7 @@ func TestRAWInputIPv6(t *testing.T) {
 	}
 	input := NewRAWInput(originAddr, conf)
 
-	output := NewTestOutput(func(msg *Message) {
+	output := test.NewTestOutput(func(msg *plugin.Message) {
 		if msg.Meta[0] == '1' {
 			atomic.AddInt64(&reqCounter, 1)
 		} else {
@@ -193,14 +198,14 @@ func TestRAWInputIPv6(t *testing.T) {
 		wg.Done()
 	})
 
-	plugins := &InOutPlugins{
-		Inputs:  []PluginReader{input},
-		Outputs: []PluginWriter{output},
+	plugins := &plugin.InOutPlugins{
+		Inputs:  []plugin.Reader{input},
+		Outputs: []plugin.Writer{output},
 	}
 
-	emitter := NewEmitter()
+	emitter := emitter.New()
 	addr := "http://" + originAddr
-	go emitter.Start(plugins, Settings.Middleware)
+	go emitter.Start(plugins)
 	for i := 0; i < 10; i++ {
 		// request + response
 		wg.Add(2)
@@ -255,17 +260,17 @@ func TestInputRAWChunkedEncoding(t *testing.T) {
 	}))
 	defer replay.Close()
 
-	httpOutput := NewHTTPOutput(replay.URL, &HTTPOutputConfig{})
+	httpOutput := gor_http.NewHTTPOutput(replay.URL, &gor_http.HTTPOutputConfig{})
 
-	plugins := &InOutPlugins{
-		Inputs:  []PluginReader{input},
-		Outputs: []PluginWriter{httpOutput},
+	plugins := &plugin.InOutPlugins{
+		Inputs:  []plugin.Reader{input},
+		Outputs: []plugin.Writer{httpOutput},
 	}
 	plugins.All = append(plugins.All, input, httpOutput)
 
-	emitter := NewEmitter()
+	emitter := emitter.New()
 	defer emitter.Close()
-	go emitter.Start(plugins, Settings.Middleware)
+	go emitter.Start(plugins)
 	wg.Add(2)
 
 	curl := exec.Command("curl", "http://"+originAddr, "--header", "Transfer-Encoding: chunked", "--header", "Expect:", "--data-binary", "@README.md")
@@ -321,7 +326,7 @@ func BenchmarkRAWInputWithReplay(b *testing.B) {
 	}
 	input := NewRAWInput(originAddr, conf)
 
-	testOutput := NewTestOutput(func(msg *Message) {
+	testOutput := test.NewTestOutput(func(msg *plugin.Message) {
 		if msg.Meta[0] == '1' {
 			reqCounter++
 		} else {
@@ -329,15 +334,15 @@ func BenchmarkRAWInputWithReplay(b *testing.B) {
 		}
 		wg.Done()
 	})
-	httpOutput := NewHTTPOutput("http://"+replayAddr, &HTTPOutputConfig{})
+	httpOutput := gor_http.NewHTTPOutput("http://"+replayAddr, &gor_http.HTTPOutputConfig{})
 
-	plugins := &InOutPlugins{
-		Inputs:  []PluginReader{input},
-		Outputs: []PluginWriter{testOutput, httpOutput},
+	plugins := &plugin.InOutPlugins{
+		Inputs:  []plugin.Reader{input},
+		Outputs: []plugin.Writer{testOutput, httpOutput},
 	}
 
-	emitter := NewEmitter()
-	go emitter.Start(plugins, Settings.Middleware)
+	emitter := emitter.New()
+	go emitter.Start(plugins)
 	addr := "http://" + originAddr
 	b.ResetTimer()
 	for i := 0; i < b.N; i++ {
diff --git a/settings.go b/pkg/settings/settings.go
similarity index 92%
rename from settings.go
rename to pkg/settings/settings.go
index 884803e6..b32a4681 100644
--- a/settings.go
+++ b/pkg/settings/settings.go
@@ -1,13 +1,22 @@
-package goreplay
+package settings
 
 import (
 	"flag"
 	"fmt"
-	"github.com/buger/goreplay/internal/size"
 	"os"
 	"strconv"
-	"sync"
 	"time"
+
+	"github.com/buger/goreplay/internal/size"
+	"github.com/buger/goreplay/pkg/binary"
+	"github.com/buger/goreplay/pkg/emitter"
+	"github.com/buger/goreplay/pkg/file"
+	"github.com/buger/goreplay/pkg/http"
+	"github.com/buger/goreplay/pkg/http_modifier"
+	"github.com/buger/goreplay/pkg/kafka"
+	"github.com/buger/goreplay/pkg/raw"
+	"github.com/buger/goreplay/pkg/tcp"
+	"github.com/buger/goreplay/pkg/ws"
 )
 
 // DEMO indicates that goreplay is running in demo mode
@@ -65,9 +74,7 @@ type AppSettings struct {
 	Stats     bool          `json:"stats"`
 	ExitAfter time.Duration `json:"exit-after"`
 
-	SplitOutput          bool   `json:"split-output"`
-	RecognizeTCPSessions bool   `json:"recognize-tcp-sessions"`
-	Pprof                string `json:"http-pprof"`
+	Pprof string `json:"http-pprof"`
 
 	CopyBufferSize size.Size `json:"copy-buffer-size"`
 
@@ -77,13 +84,13 @@ type AppSettings struct {
 	OutputNull   bool `json:"output-null"`
 
 	InputTCP        []string `json:"input-tcp"`
-	InputTCPConfig  TCPInputConfig
+	InputTCPConfig  tcp.TCPInputConfig
 	OutputTCP       []string `json:"output-tcp"`
-	OutputTCPConfig TCPOutputConfig
+	OutputTCPConfig tcp.TCPOutputConfig
 	OutputTCPStats  bool `json:"output-tcp-stats"`
 
 	OutputWebSocket       []string `json:"output-ws"`
-	OutputWebSocketConfig WebSocketOutputConfig
+	OutputWebSocketConfig ws.WebSocketOutputConfig
 	OutputWebSocketStats  bool `json:"output-ws-stats"`
 
 	InputFile          []string      `json:"input-file"`
@@ -92,32 +99,35 @@ type AppSettings struct {
 	InputFileDryRun    bool          `json:"input-file-dry-run"`
 	InputFileMaxWait   time.Duration `json:"input-file-max-wait"`
 	OutputFile         []string      `json:"output-file"`
-	OutputFileConfig   FileOutputConfig
+	OutputFileConfig   file.FileOutputConfig
 
 	InputRAW       []string `json:"input_raw"`
-	InputRAWConfig RAWInputConfig
+	InputRAWConfig raw.RAWInputConfig
 
 	Middleware string `json:"middleware"`
 
-	InputHTTP    []string
-	OutputHTTP   []string `json:"output-http"`
-	PrettifyHTTP bool     `json:"prettify-http"`
+	InputHTTP  []string
+	OutputHTTP []string `json:"output-http"`
 
-	OutputHTTPConfig HTTPOutputConfig
+	OutputHTTPConfig http.HTTPOutputConfig
+	EmitterConfig    emitter.Config
 
 	OutputBinary       []string `json:"output-binary"`
-	OutputBinaryConfig BinaryOutputConfig
+	OutputBinaryConfig binary.BinaryOutputConfig
 
-	ModifierConfig HTTPModifierConfig
+	ModifierConfig http_modifier.HTTPModifierConfig
 
-	InputKafkaConfig  InputKafkaConfig
-	OutputKafkaConfig OutputKafkaConfig
-	KafkaTLSConfig    KafkaTLSConfig
+	InputKafkaConfig  kafka.InputKafkaConfig
+	OutputKafkaConfig kafka.OutputKafkaConfig
+	KafkaTLSConfig    kafka.KafkaTLSConfig
 }
 
 // Settings holds Gor configuration
 var Settings AppSettings
 
+// VERSION the current version of goreplay
+var VERSION = "1.3.0"
+
 func usage() {
 	fmt.Printf("Gor is a simple http traffic replication tool written in Go. Its main goal is to replay traffic from production servers to staging and dev environments.\nProject page: https://github.com/buger/gor\nAuthor: <Leonid Bugaev> leonsbox@gmail.com\nCurrent Version: v%s\n\n", VERSION)
 	flag.PrintDefaults()
@@ -136,8 +146,8 @@ func init() {
 		Settings.ExitAfter = 5 * time.Minute
 	}
 
-	flag.BoolVar(&Settings.SplitOutput, "split-output", false, "By default each output gets same traffic. If set to `true` it splits traffic equally among all outputs.")
-	flag.BoolVar(&Settings.RecognizeTCPSessions, "recognize-tcp-sessions", false, "[PRO] If turned on http output will create separate worker for each TCP session. Splitting output will session based as well.")
+	flag.BoolVar(&Settings.EmitterConfig.SplitOutput, "split-output", false, "By default each output gets same traffic. If set to `true` it splits traffic equally among all outputs.")
+	flag.BoolVar(&Settings.EmitterConfig.RecognizeTCPSessions, "recognize-tcp-sessions", false, "[PRO] If turned on http output will create separate worker for each TCP session. Splitting output will session based as well.")
 
 	flag.Var(&MultiOption{&Settings.InputDummy}, "input-dummy", "Used for testing outputs. Emits 'Get /' request every 1s")
 	flag.BoolVar(&Settings.OutputStdout, "output-stdout", false, "Used for testing inputs. Just prints to console data coming from inputs.")
@@ -176,7 +186,7 @@ func init() {
 
 	flag.StringVar(&Settings.OutputFileConfig.BufferPath, "output-file-buffer", "/tmp", "The path for temporary storing current buffer: \n\tgor --input-raw :80 --output-file s3://mybucket/logs/%Y-%m-%d.gz --output-file-buffer /mnt/logs")
 
-	flag.BoolVar(&Settings.PrettifyHTTP, "prettify-http", false, "If enabled, will automatically decode requests and responses with: Content-Encoding: gzip and Transfer-Encoding: chunked. Useful for debugging, in conjunction with --output-stdout")
+	flag.BoolVar(&Settings.EmitterConfig.PrettifyHTTP, "prettify-http", false, "If enabled, will automatically decode requests and responses with: Content-Encoding: gzip and Transfer-Encoding: chunked. Useful for debugging, in conjunction with --output-stdout")
 
 	flag.Var(&Settings.CopyBufferSize, "copy-buffer-size", "Set the buffer size for an individual request (default 5MB)")
 
@@ -287,18 +297,7 @@ func CheckSettings() {
 	}
 }
 
-var previousDebugTime = time.Now()
-var debugMutex sync.Mutex
-
-// Debug take an effect only if --verbose greater than 0 is specified
-func Debug(level int, args ...interface{}) {
-	if Settings.Verbose >= level {
-		debugMutex.Lock()
-		defer debugMutex.Unlock()
-		now := time.Now()
-		diff := now.Sub(previousDebugTime)
-		previousDebugTime = now
-		fmt.Fprintf(os.Stderr, "[DEBUG][elapsed %s]: ", diff)
-		fmt.Fprintln(os.Stderr, args...)
-	}
+// Set sets the global settings
+func Set(s AppSettings) {
+	Settings = s
 }
diff --git a/settings_test.go b/pkg/settings/settings_test.go
similarity index 90%
rename from settings_test.go
rename to pkg/settings/settings_test.go
index 7d797fb1..186b8b66 100644
--- a/settings_test.go
+++ b/pkg/settings/settings_test.go
@@ -1,4 +1,4 @@
-package goreplay
+package settings
 
 import (
 	"encoding/json"
diff --git a/pkg/stats/gor_stat.go b/pkg/stats/gor_stat.go
new file mode 100644
index 00000000..139f4183
--- /dev/null
+++ b/pkg/stats/gor_stat.go
@@ -0,0 +1,66 @@
+package stats
+
+import (
+	"runtime"
+	"strconv"
+	"time"
+
+	"github.com/rs/zerolog/log"
+)
+
+// Stats is a struct that holds the stats for a given statName
+type Stats struct {
+	statName string
+	rateMs   int
+	latest   int
+	mean     int
+	max      int
+	count    int
+}
+
+// New creates a new Stats struct
+func New(statName string, rateMs int) (s *Stats) {
+	s = new(Stats)
+	s.statName = statName
+	s.rateMs = rateMs
+	s.latest = 0
+	s.mean = 0
+	s.max = 0
+	s.count = 0
+
+	go s.reportStats()
+
+	return
+}
+
+func (s *Stats) Write(latest int) {
+	if latest > s.max {
+		s.max = latest
+	}
+	if latest != 0 {
+		s.mean = ((s.mean * s.count) + latest) / (s.count + 1)
+	}
+	s.latest = latest
+	s.count = s.count + 1
+}
+
+// Reset resets the stats
+func (s *Stats) Reset() {
+	s.latest = 0
+	s.max = 0
+	s.mean = 0
+	s.count = 0
+}
+
+func (s *Stats) String() string {
+	return s.statName + ":" + strconv.Itoa(s.latest) + "," + strconv.Itoa(s.mean) + "," + strconv.Itoa(s.max) + "," + strconv.Itoa(s.count) + "," + strconv.Itoa(s.count/(s.rateMs/1000.0)) + "," + strconv.Itoa(runtime.NumGoroutine())
+}
+
+func (s *Stats) reportStats() {
+	log.Info().Msg(s.statName + ":latest,mean,max,count,count/second,gcount")
+	for {
+		log.Info().Msg(s.String())
+		s.Reset()
+		time.Sleep(time.Duration(s.rateMs) * time.Millisecond)
+	}
+}
diff --git a/input_tcp.go b/pkg/tcp/input_tcp.go
similarity index 76%
rename from input_tcp.go
rename to pkg/tcp/input_tcp.go
index e31217cc..bc237ab8 100644
--- a/input_tcp.go
+++ b/pkg/tcp/input_tcp.go
@@ -1,18 +1,21 @@
-package goreplay
+package tcp
 
 import (
 	"bufio"
 	"bytes"
 	"crypto/tls"
-	"fmt"
 	"io"
-	"log"
 	"net"
+
+	"github.com/buger/goreplay/pkg/plugin"
+	"github.com/buger/goreplay/pkg/proto"
+
+	"github.com/rs/zerolog/log"
 )
 
 // TCPInput used for internal communication
 type TCPInput struct {
-	data     chan *Message
+	data     chan *plugin.Message
 	listener net.Listener
 	address  string
 	config   *TCPInputConfig
@@ -29,7 +32,7 @@ type TCPInputConfig struct {
 // NewTCPInput constructor for TCPInput, accepts address with port
 func NewTCPInput(address string, config *TCPInputConfig) (i *TCPInput) {
 	i = new(TCPInput)
-	i.data = make(chan *Message, 1000)
+	i.data = make(chan *plugin.Message, 1000)
 	i.address = address
 	i.config = config
 	i.stop = make(chan bool)
@@ -40,10 +43,10 @@ func NewTCPInput(address string, config *TCPInputConfig) (i *TCPInput) {
 }
 
 // PluginRead returns data and details read from plugin
-func (i *TCPInput) PluginRead() (msg *Message, err error) {
+func (i *TCPInput) PluginRead() (msg *plugin.Message, err error) {
 	select {
 	case <-i.stop:
-		return nil, ErrorStopped
+		return nil, plugin.ErrorStopped
 	case msg = <-i.data:
 		return msg, nil
 	}
@@ -61,19 +64,19 @@ func (i *TCPInput) listen(address string) {
 	if i.config.Secure {
 		cer, err := tls.LoadX509KeyPair(i.config.CertificatePath, i.config.KeyPath)
 		if err != nil {
-			log.Fatalln("error while loading --input-tcp TLS certificate:", err)
+			log.Fatal().Err(err).Msg("error while loading --input-tcp TLS certificate")
 		}
 
 		config := &tls.Config{Certificates: []tls.Certificate{cer}}
 		listener, err := tls.Listen("tcp", address, config)
 		if err != nil {
-			log.Fatalln("[INPUT-TCP] failed to start INPUT-TCP listener:", err)
+			log.Fatal().Err(err).Msg("failed to start INPUT-TCP listener")
 		}
 		i.listener = listener
 	} else {
 		listener, err := net.Listen("tcp", address)
 		if err != nil {
-			log.Fatalln("failed to start INPUT-TCP listener:", err)
+			log.Fatal().Err(err).Msg("failed to start INPUT-TCP listener")
 		}
 		i.listener = listener
 	}
@@ -88,15 +91,13 @@ func (i *TCPInput) listen(address string) {
 				continue
 			}
 			if operr, ok := err.(*net.OpError); ok && operr.Err.Error() != "use of closed network connection" {
-				Debug(0, fmt.Sprintf("[INPUT-TCP] listener closed, err: %q", err))
+				log.Error().Err(err).Msg("failed to accept connection")
 			}
 			break
 		}
 	}()
 }
 
-var payloadSeparatorAsBytes = []byte(payloadSeparator)
-
 func (i *TCPInput) handleConnection(conn net.Conn) {
 	defer conn.Close()
 
@@ -110,16 +111,16 @@ func (i *TCPInput) handleConnection(conn net.Conn) {
 				continue
 			}
 			if err != io.EOF {
-				Debug(0, fmt.Sprintf("[INPUT-TCP] connection error: %q", err))
+				log.Err(err).Msg("failed to read from connection")
 			}
 			break
 		}
 
-		if bytes.Equal(payloadSeparatorAsBytes[1:], line) {
+		if bytes.Equal(proto.PayloadSeparatorAsBytes[1:], line) {
 			// unread the '\n' before monkeys
 			buffer.UnreadByte()
-			var msg Message
-			msg.Meta, msg.Data = payloadMetaWithBody(buffer.Bytes())
+			var msg plugin.Message
+			msg.Meta, msg.Data = proto.PayloadMetaWithBody(buffer.Bytes())
 			i.data <- &msg
 			buffer.Reset()
 		} else {
diff --git a/input_tcp_test.go b/pkg/tcp/input_tcp_test.go
similarity index 79%
rename from input_tcp_test.go
rename to pkg/tcp/input_tcp_test.go
index 543b0d08..3751f19b 100644
--- a/input_tcp_test.go
+++ b/pkg/tcp/input_tcp_test.go
@@ -1,4 +1,4 @@
-package goreplay
+package tcp
 
 import (
 	"bytes"
@@ -15,24 +15,29 @@ import (
 	"sync"
 	"testing"
 	"time"
+
+	"github.com/buger/goreplay/pkg/emitter"
+	"github.com/buger/goreplay/pkg/plugin"
+	"github.com/buger/goreplay/pkg/proto"
+	"github.com/buger/goreplay/pkg/test"
 )
 
 func TestTCPInput(t *testing.T) {
 	wg := new(sync.WaitGroup)
 
 	input := NewTCPInput("127.0.0.1:0", &TCPInputConfig{})
-	output := NewTestOutput(func(*Message) {
+	output := test.NewTestOutput(func(*plugin.Message) {
 		wg.Done()
 	})
 
-	plugins := &InOutPlugins{
-		Inputs:  []PluginReader{input},
-		Outputs: []PluginWriter{output},
+	plugins := &plugin.InOutPlugins{
+		Inputs:  []plugin.Reader{input},
+		Outputs: []plugin.Writer{output},
 	}
 	plugins.All = append(plugins.All, input, output)
 
-	emitter := NewEmitter()
-	go emitter.Start(plugins, Settings.Middleware)
+	emitter := emitter.New()
+	go emitter.Start(plugins)
 
 	tcpAddr, err := net.ResolveTCPAddr("tcp", input.listener.Addr().String())
 
@@ -50,7 +55,7 @@ func TestTCPInput(t *testing.T) {
 	for i := 0; i < 100; i++ {
 		wg.Add(1)
 		if _, err = conn.Write(msg); err == nil {
-			_, err = conn.Write(payloadSeparatorAsBytes)
+			_, err = conn.Write(proto.PayloadSeparatorAsBytes)
 		}
 		if err != nil {
 			t.Error(err)
@@ -106,18 +111,18 @@ func TestTCPInputSecure(t *testing.T) {
 		CertificatePath: serverCertPemFile.Name(),
 		KeyPath:         serverPrivPemFile.Name(),
 	})
-	output := NewTestOutput(func(*Message) {
+	output := test.NewTestOutput(func(*plugin.Message) {
 		wg.Done()
 	})
 
-	plugins := &InOutPlugins{
-		Inputs:  []PluginReader{input},
-		Outputs: []PluginWriter{output},
+	plugins := &plugin.InOutPlugins{
+		Inputs:  []plugin.Reader{input},
+		Outputs: []plugin.Writer{output},
 	}
 	plugins.All = append(plugins.All, input, output)
 
-	emitter := NewEmitter()
-	go emitter.Start(plugins, Settings.Middleware)
+	emitter := emitter.New()
+	go emitter.Start(plugins)
 
 	conf := &tls.Config{
 		InsecureSkipVerify: true,
@@ -134,7 +139,7 @@ func TestTCPInputSecure(t *testing.T) {
 	for i := 0; i < 100; i++ {
 		wg.Add(1)
 		conn.Write(msg)
-		conn.Write([]byte(payloadSeparator))
+		conn.Write([]byte(proto.PayloadSeparator))
 	}
 
 	wg.Wait()
diff --git a/output_tcp.go b/pkg/tcp/output_tcp.go
similarity index 69%
rename from output_tcp.go
rename to pkg/tcp/output_tcp.go
index 2a3680cf..993ab8b6 100644
--- a/output_tcp.go
+++ b/pkg/tcp/output_tcp.go
@@ -1,4 +1,4 @@
-package goreplay
+package tcp
 
 import (
 	"context"
@@ -7,16 +7,23 @@ import (
 	"hash/fnv"
 	"net"
 	"time"
+
+	"github.com/buger/goreplay/pkg/plugin"
+	"github.com/buger/goreplay/pkg/proto"
+	"github.com/buger/goreplay/pkg/stats"
+
+	"github.com/rs/zerolog/log"
 )
 
 // TCPOutput used for sending raw tcp payloads
 // Currently used for internal communication between listener and replay server
 // Can be used for transferring binary payloads like protocol buffers
 type TCPOutput struct {
-	address     string
-	limit       int
-	buf         []chan *Message
-	bufStats    *GorStat
+	address string
+	limit   int
+
+	buf         []chan *plugin.Message
+	bufStats    *stats.Stats
 	config      *TCPOutputConfig
 	workerIndex uint32
 
@@ -29,24 +36,25 @@ type TCPOutputConfig struct {
 	Sticky     bool `json:"output-tcp-sticky"`
 	SkipVerify bool `json:"output-tcp-skip-verify"`
 	Workers    int  `json:"output-tcp-workers"`
+	Stats      bool `json:"output-tcp-stats"`
 }
 
 // NewTCPOutput constructor for TCPOutput
 // Initialize X workers which hold keep-alive connection
-func NewTCPOutput(address string, config *TCPOutputConfig) PluginWriter {
+func NewTCPOutput(address string, config *TCPOutputConfig) plugin.Writer {
 	o := new(TCPOutput)
 
 	o.address = address
 	o.config = config
 
-	if Settings.OutputTCPStats {
-		o.bufStats = NewGorStat("output_tcp", 5000)
+	if config.Stats {
+		o.bufStats = stats.New("output_tcp", 5000)
 	}
 
 	// create X buffers and send the buffer index to the worker
-	o.buf = make([]chan *Message, o.config.Workers)
+	o.buf = make([]chan *plugin.Message, o.config.Workers)
 	for i := 0; i < o.config.Workers; i++ {
-		o.buf[i] = make(chan *Message, 100)
+		o.buf[i] = make(chan *plugin.Message, 100)
 		go o.worker(i)
 	}
 
@@ -65,7 +73,7 @@ func (o *TCPOutput) worker(bufferIndex int) {
 			break
 		}
 
-		Debug(1, fmt.Sprintf("Can't connect to aggregator instance, reconnecting in 1 second. Retries:%d", retries))
+		log.Error().Msgf("Can't connect to aggregator instance, reconnecting in 1 second. Retries:%d", retries)
 		time.Sleep(1 * time.Second)
 
 		conn, err = o.connect(o.address)
@@ -73,7 +81,7 @@ func (o *TCPOutput) worker(bufferIndex int) {
 	}
 
 	if retries > 0 {
-		Debug(2, fmt.Sprintf("Connected to aggregator instance after %d retries", retries))
+		log.Info().Msgf("Connected to aggregator instance after %d retries", retries)
 	}
 
 	defer conn.Close()
@@ -82,12 +90,12 @@ func (o *TCPOutput) worker(bufferIndex int) {
 		msg := <-o.buf[bufferIndex]
 		if _, err = conn.Write(msg.Meta); err == nil {
 			if _, err = conn.Write(msg.Data); err == nil {
-				_, err = conn.Write(payloadSeparatorAsBytes)
+				_, err = conn.Write(proto.PayloadSeparatorAsBytes)
 			}
 		}
 
 		if err != nil {
-			Debug(2, "INFO: TCP output connection closed, reconnecting")
+			log.Info().Err(err).Msg("INFO: TCP output connection closed, reconnecting")
 			o.buf[bufferIndex] <- msg
 			go o.worker(bufferIndex)
 			break
@@ -95,27 +103,27 @@ func (o *TCPOutput) worker(bufferIndex int) {
 	}
 }
 
-func (o *TCPOutput) getBufferIndex(msg *Message) int {
+func (o *TCPOutput) getBufferIndex(msg *plugin.Message) int {
 	if !o.config.Sticky {
 		o.workerIndex++
 		return int(o.workerIndex) % o.config.Workers
 	}
 
 	hasher := fnv.New32a()
-	hasher.Write(payloadID(msg.Meta))
+	hasher.Write(proto.PayloadID(msg.Meta))
 	return int(hasher.Sum32()) % o.config.Workers
 }
 
 // PluginWrite writes message to this plugin
-func (o *TCPOutput) PluginWrite(msg *Message) (n int, err error) {
-	if !isOriginPayload(msg.Meta) {
+func (o *TCPOutput) PluginWrite(msg *plugin.Message) (n int, err error) {
+	if !proto.IsOriginPayload(msg.Meta) {
 		return len(msg.Data), nil
 	}
 
 	bufferIndex := o.getBufferIndex(msg)
 	o.buf[bufferIndex] <- msg
 
-	if Settings.OutputTCPStats {
+	if o.config.Stats {
 		o.bufStats.Write(len(o.buf[bufferIndex]))
 	}
 
diff --git a/output_tcp_test.go b/pkg/tcp/output_tcp_test.go
similarity index 76%
rename from output_tcp_test.go
rename to pkg/tcp/output_tcp_test.go
index 8a860b16..7ccf4b27 100644
--- a/output_tcp_test.go
+++ b/pkg/tcp/output_tcp_test.go
@@ -1,4 +1,4 @@
-package goreplay
+package tcp
 
 import (
 	"bufio"
@@ -7,6 +7,11 @@ import (
 	"sync"
 	"testing"
 	"time"
+
+	"github.com/buger/goreplay/pkg/emitter"
+	"github.com/buger/goreplay/pkg/plugin"
+	"github.com/buger/goreplay/pkg/proto"
+	"github.com/buger/goreplay/pkg/test"
 )
 
 func TestTCPOutput(t *testing.T) {
@@ -15,16 +20,16 @@ func TestTCPOutput(t *testing.T) {
 	listener := startTCP(func(data []byte) {
 		wg.Done()
 	})
-	input := NewTestInput()
+	input := test.NewTestInput()
 	output := NewTCPOutput(listener.Addr().String(), &TCPOutputConfig{Workers: 10})
 
-	plugins := &InOutPlugins{
-		Inputs:  []PluginReader{input},
-		Outputs: []PluginWriter{output},
+	plugins := &plugin.InOutPlugins{
+		Inputs:  []plugin.Reader{input},
+		Outputs: []plugin.Writer{output},
 	}
 
-	emitter := NewEmitter()
-	go emitter.Start(plugins, Settings.Middleware)
+	emitter := emitter.New()
+	go emitter.Start(plugins)
 
 	for i := 0; i < 10; i++ {
 		wg.Add(1)
@@ -50,7 +55,7 @@ func startTCP(cb func([]byte)) net.Listener {
 				defer conn.Close()
 				reader := bufio.NewReader(conn)
 				scanner := bufio.NewScanner(reader)
-				scanner.Split(payloadScanner)
+				scanner.Split(proto.PayloadScanner)
 
 				for scanner.Scan() {
 					cb(scanner.Bytes())
@@ -68,23 +73,23 @@ func BenchmarkTCPOutput(b *testing.B) {
 	listener := startTCP(func(data []byte) {
 		wg.Done()
 	})
-	input := NewTestInput()
-	input.data = make(chan []byte, b.N)
+	input := test.NewTestInput()
+	input.Data = make(chan []byte, b.N)
 	for i := 0; i < b.N; i++ {
 		input.EmitGET()
 	}
 	wg.Add(b.N)
 	output := NewTCPOutput(listener.Addr().String(), &TCPOutputConfig{Workers: 10})
 
-	plugins := &InOutPlugins{
-		Inputs:  []PluginReader{input},
-		Outputs: []PluginWriter{output},
+	plugins := &plugin.InOutPlugins{
+		Inputs:  []plugin.Reader{input},
+		Outputs: []plugin.Writer{output},
 	}
 
-	emitter := NewEmitter()
+	emitter := emitter.New()
 	// avoid counting above initialization
 	b.ResetTimer()
-	go emitter.Start(plugins, Settings.Middleware)
+	go emitter.Start(plugins)
 
 	wg.Wait()
 	emitter.Close()
@@ -125,9 +130,9 @@ func TestBufferDistribution(t *testing.T) {
 	}
 }
 
-func getTestBytes() *Message {
-	return &Message{
-		Meta: payloadHeader(RequestPayload, uuid(), time.Now().UnixNano(), -1),
+func getTestBytes() *plugin.Message {
+	return &plugin.Message{
+		Meta: proto.PayloadHeader(proto.RequestPayload, proto.UUID(), time.Now().UnixNano(), -1),
 		Data: []byte("GET / HTTP/1.1\r\nHost: www.w3.org\r\nUser-Agent: Go 1.1 package http\r\nAccept-Encoding: gzip\r\n\r\n"),
 	}
 }
diff --git a/test_input.go b/pkg/test/test_input.go
similarity index 66%
rename from test_input.go
rename to pkg/test/test_input.go
index 64e47a29..ce304d6f 100644
--- a/test_input.go
+++ b/pkg/test/test_input.go
@@ -1,45 +1,44 @@
-package goreplay
+package test
 
 import (
 	"encoding/base64"
-	"errors"
 	"math/rand"
 	"time"
-)
 
-// ErrorStopped is the error returned when the go routines reading the input is stopped.
-var ErrorStopped = errors.New("reading stopped")
+	"github.com/buger/goreplay/pkg/plugin"
+	"github.com/buger/goreplay/pkg/proto"
+)
 
 // TestInput used for testing purpose, it allows emitting requests on demand
 type TestInput struct {
-	data       chan []byte
-	skipHeader bool
+	SkipHeader bool
+	Data       chan []byte
 	stop       chan bool // Channel used only to indicate goroutine should shutdown
 }
 
 // NewTestInput constructor for TestInput
 func NewTestInput() (i *TestInput) {
 	i = new(TestInput)
-	i.data = make(chan []byte, 100)
+	i.Data = make(chan []byte, 100)
 	i.stop = make(chan bool)
 	return
 }
 
 // PluginRead reads message from this plugin
-func (i *TestInput) PluginRead() (*Message, error) {
-	var msg Message
+func (i *TestInput) PluginRead() (*plugin.Message, error) {
+	var msg plugin.Message
 	select {
-	case buf := <-i.data:
+	case buf := <-i.Data:
 		msg.Data = buf
-		if !i.skipHeader {
-			msg.Meta = payloadHeader(RequestPayload, uuid(), time.Now().UnixNano(), -1)
+		if !i.SkipHeader {
+			msg.Meta = proto.PayloadHeader(proto.RequestPayload, proto.UUID(), time.Now().UnixNano(), -1)
 		} else {
-			msg.Meta, msg.Data = payloadMetaWithBody(msg.Data)
+			msg.Meta, msg.Data = proto.PayloadMetaWithBody(msg.Data)
 		}
 
 		return &msg, nil
 	case <-i.stop:
-		return nil, ErrorStopped
+		return nil, plugin.ErrorStopped
 	}
 }
 
@@ -51,22 +50,22 @@ func (i *TestInput) Close() error {
 
 // EmitBytes sends data
 func (i *TestInput) EmitBytes(data []byte) {
-	i.data <- data
+	i.Data <- data
 }
 
 // EmitGET emits GET request without headers
 func (i *TestInput) EmitGET() {
-	i.data <- []byte("GET / HTTP/1.1\r\n\r\n")
+	i.Data <- []byte("GET / HTTP/1.1\r\n\r\n")
 }
 
 // EmitPOST emits POST request with Content-Length
 func (i *TestInput) EmitPOST() {
-	i.data <- []byte("POST /pub/WWW/ HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	i.Data <- []byte("POST /pub/WWW/ HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
 }
 
 // EmitChunkedPOST emits POST request with `Transfer-Encoding: chunked` and chunked body
 func (i *TestInput) EmitChunkedPOST() {
-	i.data <- []byte("POST /pub/WWW/ HTTP/1.1\r\nHost: www.w3.org\r\nTransfer-Encoding: chunked\r\n\r\n4\r\nWiki\r\n5\r\npedia\r\ne\r\n in\r\n\r\nchunks.\r\n0\r\n\r\n")
+	i.Data <- []byte("POST /pub/WWW/ HTTP/1.1\r\nHost: www.w3.org\r\nTransfer-Encoding: chunked\r\n\r\n4\r\nWiki\r\n5\r\npedia\r\ne\r\n in\r\n\r\nchunks.\r\n0\r\n\r\n")
 }
 
 // EmitLargePOST emits POST request with large payload (5mb)
@@ -77,7 +76,7 @@ func (i *TestInput) EmitLargePOST() {
 
 	rs := base64.URLEncoding.EncodeToString(rb)
 
-	i.data <- []byte("POST / HTTP/1.1\r\nHost: www.w3.org\nContent-Length:5242880\r\n\r\n" + rs)
+	i.Data <- []byte("POST / HTTP/1.1\r\nHost: www.w3.org\nContent-Length:5242880\r\n\r\n" + rs)
 }
 
 // EmitSizedPOST emit a POST with a payload set to a supplied size
@@ -87,12 +86,12 @@ func (i *TestInput) EmitSizedPOST(payloadSize int) {
 
 	rs := base64.URLEncoding.EncodeToString(rb)
 
-	i.data <- []byte("POST / HTTP/1.1\r\nHost: www.w3.org\nContent-Length:5242880\r\n\r\n" + rs)
+	i.Data <- []byte("POST / HTTP/1.1\r\nHost: www.w3.org\nContent-Length:5242880\r\n\r\n" + rs)
 }
 
 // EmitOPTIONS emits OPTIONS request, similar to GET
 func (i *TestInput) EmitOPTIONS() {
-	i.data <- []byte("OPTIONS / HTTP/1.1\r\nHost: www.w3.org\r\n\r\n")
+	i.Data <- []byte("OPTIONS / HTTP/1.1\r\nHost: www.w3.org\r\n\r\n")
 }
 
 func (i *TestInput) String() string {
diff --git a/test_output.go b/pkg/test/test_output.go
similarity index 59%
rename from test_output.go
rename to pkg/test/test_output.go
index 82c1301a..5888f7ac 100644
--- a/test_output.go
+++ b/pkg/test/test_output.go
@@ -1,14 +1,17 @@
-package goreplay
+package test
 
-type writeCallback func(*Message)
+import "github.com/buger/goreplay/pkg/plugin"
+
+// WriteCallback callback for TestOutput
+type WriteCallback func(*plugin.Message)
 
 // TestOutput used in testing to intercept any output into callback
 type TestOutput struct {
-	cb writeCallback
+	cb WriteCallback
 }
 
 // NewTestOutput constructor for TestOutput, accepts callback which get called on each incoming Write
-func NewTestOutput(cb writeCallback) PluginWriter {
+func NewTestOutput(cb WriteCallback) plugin.Writer {
 	i := new(TestOutput)
 	i.cb = cb
 
@@ -16,7 +19,7 @@ func NewTestOutput(cb writeCallback) PluginWriter {
 }
 
 // PluginWrite write message to this plugin
-func (i *TestOutput) PluginWrite(msg *Message) (int, error) {
+func (i *TestOutput) PluginWrite(msg *plugin.Message) (int, error) {
 	i.cb(msg)
 
 	return len(msg.Data) + len(msg.Meta), nil
diff --git a/output_ws.go b/pkg/ws/output_ws.go
similarity index 72%
rename from output_ws.go
rename to pkg/ws/output_ws.go
index 3f2a1025..733fddbc 100644
--- a/output_ws.go
+++ b/pkg/ws/output_ws.go
@@ -1,17 +1,22 @@
-package goreplay
+package ws
 
 import (
 	"context"
 	"crypto/tls"
 	"encoding/base64"
 	"fmt"
-	"github.com/gorilla/websocket"
 	"hash/fnv"
-	"log"
 	"net/http"
 	"net/url"
 	"strings"
 	"time"
+
+	"github.com/buger/goreplay/pkg/plugin"
+	"github.com/buger/goreplay/pkg/proto"
+	"github.com/buger/goreplay/pkg/stats"
+	"github.com/gorilla/websocket"
+
+	"github.com/rs/zerolog/log"
 )
 
 // WebSocketOutput used for sending raw tcp payloads
@@ -19,8 +24,8 @@ import (
 type WebSocketOutput struct {
 	address     string
 	limit       int
-	buf         []chan *Message
-	bufStats    *GorStat
+	buf         []chan *plugin.Message
+	bufStats    *stats.Stats
 	config      *WebSocketOutputConfig
 	workerIndex uint32
 	headers     http.Header
@@ -33,16 +38,17 @@ type WebSocketOutputConfig struct {
 	Sticky     bool `json:"output-ws-sticky"`
 	SkipVerify bool `json:"output-ws-skip-verify"`
 	Workers    int  `json:"output-ws-workers"`
+	Stats      bool `json:"output-ws-stats"`
 }
 
 // NewWebSocketOutput constructor for WebSocketOutput
 // Initialize X workers which hold keep-alive connection
-func NewWebSocketOutput(address string, config *WebSocketOutputConfig) PluginWriter {
+func NewWebSocketOutput(address string, config *WebSocketOutputConfig) plugin.Writer {
 	o := new(WebSocketOutput)
 
 	u, err := url.Parse(address)
 	if err != nil {
-		log.Fatal(fmt.Sprintf("[OUTPUT-WS] parse WS output URL error[%q]", err))
+		log.Fatal().Err(err).Msgf("parse WS output URL error")
 	}
 
 	o.config = config
@@ -53,14 +59,14 @@ func NewWebSocketOutput(address string, config *WebSocketOutputConfig) PluginWri
 	u.User = nil // must be after creating the headers
 	o.address = u.String()
 
-	if Settings.OutputWebSocketStats {
-		o.bufStats = NewGorStat("output_ws", 5000)
+	if config.Stats {
+		o.bufStats = stats.New("output_ws", 5000)
 	}
 
 	// create X buffers and send the buffer index to the worker
-	o.buf = make([]chan *Message, o.config.Workers)
+	o.buf = make([]chan *plugin.Message, o.config.Workers)
 	for i := 0; i < o.config.Workers; i++ {
-		o.buf[i] = make(chan *Message, 100)
+		o.buf[i] = make(chan *plugin.Message, 100)
 		go o.worker(i)
 	}
 
@@ -79,7 +85,7 @@ func (o *WebSocketOutput) worker(bufferIndex int) {
 			break
 		}
 
-		Debug(1, fmt.Sprintf("Can't connect to aggregator instance, reconnecting in 1 second. Retries:%d", retries))
+		log.Error().Err(err).Msgf("Can't connect to aggregator instance, reconnecting in 1 second. Retries:%d", retries)
 		time.Sleep(1 * time.Second)
 
 		conn, err = o.connect(o.address)
@@ -87,7 +93,7 @@ func (o *WebSocketOutput) worker(bufferIndex int) {
 	}
 
 	if retries > 0 {
-		Debug(2, fmt.Sprintf("Connected to aggregator instance after %d retries", retries))
+		log.Info().Msgf("Connected to aggregator instance after %d retries", retries)
 	}
 
 	defer conn.Close()
@@ -96,7 +102,7 @@ func (o *WebSocketOutput) worker(bufferIndex int) {
 		msg := <-o.buf[bufferIndex]
 		err = conn.WriteMessage(websocket.BinaryMessage, append(msg.Meta, msg.Data...))
 		if err != nil {
-			Debug(2, "INFO: WebSocket output connection closed, reconnecting "+err.Error())
+			log.Error().Err(err).Msgf("Can't write to aggregator instance, reconnecting in 1 second")
 			o.buf[bufferIndex] <- msg
 			go o.worker(bufferIndex)
 			break
@@ -104,27 +110,27 @@ func (o *WebSocketOutput) worker(bufferIndex int) {
 	}
 }
 
-func (o *WebSocketOutput) getBufferIndex(msg *Message) int {
+func (o *WebSocketOutput) getBufferIndex(msg *plugin.Message) int {
 	if !o.config.Sticky {
 		o.workerIndex++
 		return int(o.workerIndex) % o.config.Workers
 	}
 
 	hasher := fnv.New32a()
-	hasher.Write(payloadID(msg.Meta))
+	hasher.Write(proto.PayloadID(msg.Meta))
 	return int(hasher.Sum32()) % o.config.Workers
 }
 
 // PluginWrite writes message to this plugin
-func (o *WebSocketOutput) PluginWrite(msg *Message) (n int, err error) {
-	if !isOriginPayload(msg.Meta) {
+func (o *WebSocketOutput) PluginWrite(msg *plugin.Message) (n int, err error) {
+	if !proto.IsOriginPayload(msg.Meta) {
 		return len(msg.Data), nil
 	}
 
 	bufferIndex := o.getBufferIndex(msg)
 	o.buf[bufferIndex] <- msg
 
-	if Settings.OutputTCPStats {
+	if o.config.Stats {
 		o.bufStats.Write(len(o.buf[bufferIndex]))
 	}
 
diff --git a/output_ws_test.go b/pkg/ws/output_ws_test.go
similarity index 74%
rename from output_ws_test.go
rename to pkg/ws/output_ws_test.go
index c80314df..25071768 100644
--- a/output_ws_test.go
+++ b/pkg/ws/output_ws_test.go
@@ -1,11 +1,16 @@
-package goreplay
+package ws
 
 import (
-	"github.com/gorilla/websocket"
 	"log"
 	"net/http"
 	"sync"
 	"testing"
+
+	"github.com/buger/goreplay/pkg/emitter"
+	"github.com/buger/goreplay/pkg/plugin"
+	"github.com/buger/goreplay/pkg/test"
+
+	"github.com/gorilla/websocket"
 )
 
 func TestWebSocketOutput(t *testing.T) {
@@ -14,16 +19,16 @@ func TestWebSocketOutput(t *testing.T) {
 	wsAddr := startWebsocket(func(data []byte) {
 		wg.Done()
 	})
-	input := NewTestInput()
+	input := test.NewTestInput()
 	output := NewWebSocketOutput(wsAddr, &WebSocketOutputConfig{Workers: 1})
 
-	plugins := &InOutPlugins{
-		Inputs:  []PluginReader{input},
-		Outputs: []PluginWriter{output},
+	plugins := &plugin.InOutPlugins{
+		Inputs:  []plugin.Reader{input},
+		Outputs: []plugin.Writer{output},
 	}
 
-	emitter := NewEmitter()
-	go emitter.Start(plugins, Settings.Middleware)
+	emitter := emitter.New()
+	go emitter.Start(plugins)
 
 	for i := 0; i < 10; i++ {
 		wg.Add(1)
diff --git a/plugins.go b/plugins.go
deleted file mode 100644
index d37b6832..00000000
--- a/plugins.go
+++ /dev/null
@@ -1,166 +0,0 @@
-package goreplay
-
-import (
-	"reflect"
-	"strings"
-)
-
-// Message represents data across plugins
-type Message struct {
-	Meta []byte // metadata
-	Data []byte // actual data
-}
-
-// PluginReader is an interface for input plugins
-type PluginReader interface {
-	PluginRead() (msg *Message, err error)
-}
-
-// PluginWriter is an interface for output plugins
-type PluginWriter interface {
-	PluginWrite(msg *Message) (n int, err error)
-}
-
-// PluginReadWriter is an interface for plugins that support reading and writing
-type PluginReadWriter interface {
-	PluginReader
-	PluginWriter
-}
-
-// InOutPlugins struct for holding references to plugins
-type InOutPlugins struct {
-	Inputs  []PluginReader
-	Outputs []PluginWriter
-	All     []interface{}
-}
-
-// extractLimitOptions detects if plugin get called with limiter support
-// Returns address and limit
-func extractLimitOptions(options string) (string, string) {
-	split := strings.Split(options, "|")
-
-	if len(split) > 1 {
-		return split[0], split[1]
-	}
-
-	return split[0], ""
-}
-
-// Automatically detects type of plugin and initialize it
-//
-// See this article if curious about reflect stuff below: http://blog.burntsushi.net/type-parametric-functions-golang
-func (plugins *InOutPlugins) registerPlugin(constructor interface{}, options ...interface{}) {
-	var path, limit string
-	vc := reflect.ValueOf(constructor)
-
-	// Pre-processing options to make it work with reflect
-	vo := []reflect.Value{}
-	for _, oi := range options {
-		vo = append(vo, reflect.ValueOf(oi))
-	}
-
-	if len(vo) > 0 {
-		// Removing limit options from path
-		path, limit = extractLimitOptions(vo[0].String())
-
-		// Writing value back without limiter "|" options
-		vo[0] = reflect.ValueOf(path)
-	}
-
-	// Calling our constructor with list of given options
-	plugin := vc.Call(vo)[0].Interface()
-
-	if limit != "" {
-		plugin = NewLimiter(plugin, limit)
-	}
-
-	// Some of the output can be Readers as well because return responses
-	if r, ok := plugin.(PluginReader); ok {
-		plugins.Inputs = append(plugins.Inputs, r)
-	}
-
-	if w, ok := plugin.(PluginWriter); ok {
-		plugins.Outputs = append(plugins.Outputs, w)
-	}
-	plugins.All = append(plugins.All, plugin)
-}
-
-// NewPlugins specify and initialize all available plugins
-func NewPlugins() *InOutPlugins {
-	plugins := new(InOutPlugins)
-
-	for _, options := range Settings.InputDummy {
-		plugins.registerPlugin(NewDummyInput, options)
-	}
-
-	for range Settings.OutputDummy {
-		plugins.registerPlugin(NewDummyOutput)
-	}
-
-	if Settings.OutputStdout {
-		plugins.registerPlugin(NewDummyOutput)
-	}
-
-	if Settings.OutputNull {
-		plugins.registerPlugin(NewNullOutput)
-	}
-
-	for _, options := range Settings.InputRAW {
-		plugins.registerPlugin(NewRAWInput, options, Settings.InputRAWConfig)
-	}
-
-	for _, options := range Settings.InputTCP {
-		plugins.registerPlugin(NewTCPInput, options, &Settings.InputTCPConfig)
-	}
-
-	for _, options := range Settings.OutputTCP {
-		plugins.registerPlugin(NewTCPOutput, options, &Settings.OutputTCPConfig)
-	}
-
-	for _, options := range Settings.OutputWebSocket {
-		plugins.registerPlugin(NewWebSocketOutput, options, &Settings.OutputWebSocketConfig)
-	}
-
-	for _, options := range Settings.InputFile {
-		plugins.registerPlugin(NewFileInput, options, Settings.InputFileLoop, Settings.InputFileReadDepth, Settings.InputFileMaxWait, Settings.InputFileDryRun)
-	}
-
-	for _, path := range Settings.OutputFile {
-		if strings.HasPrefix(path, "s3://") {
-			plugins.registerPlugin(NewS3Output, path, &Settings.OutputFileConfig)
-		} else {
-			plugins.registerPlugin(NewFileOutput, path, &Settings.OutputFileConfig)
-		}
-	}
-
-	for _, options := range Settings.InputHTTP {
-		plugins.registerPlugin(NewHTTPInput, options)
-	}
-
-	// If we explicitly set Host header http output should not rewrite it
-	// Fix: https://github.com/buger/gor/issues/174
-	for _, header := range Settings.ModifierConfig.Headers {
-		if header.Name == "Host" {
-			Settings.OutputHTTPConfig.OriginalHost = true
-			break
-		}
-	}
-
-	for _, options := range Settings.OutputHTTP {
-		plugins.registerPlugin(NewHTTPOutput, options, &Settings.OutputHTTPConfig)
-	}
-
-	for _, options := range Settings.OutputBinary {
-		plugins.registerPlugin(NewBinaryOutput, options, &Settings.OutputBinaryConfig)
-	}
-
-	if Settings.OutputKafkaConfig.Host != "" && Settings.OutputKafkaConfig.Topic != "" {
-		plugins.registerPlugin(NewKafkaOutput, "", &Settings.OutputKafkaConfig, &Settings.KafkaTLSConfig)
-	}
-
-	if Settings.InputKafkaConfig.Host != "" && Settings.InputKafkaConfig.Topic != "" {
-		plugins.registerPlugin(NewKafkaInput, "", &Settings.InputKafkaConfig, &Settings.KafkaTLSConfig)
-	}
-
-	return plugins
-}
diff --git a/plugins_test.go b/plugins_test.go
deleted file mode 100644
index 7e50d239..00000000
--- a/plugins_test.go
+++ /dev/null
@@ -1,43 +0,0 @@
-package goreplay
-
-import (
-	"testing"
-)
-
-func TestPluginsRegistration(t *testing.T) {
-	Settings.InputDummy = []string{"[]"}
-	Settings.OutputDummy = []string{"[]"}
-	Settings.OutputHTTP = []string{"www.example.com|10"}
-	Settings.InputFile = []string{"/dev/null"}
-
-	plugins := NewPlugins()
-
-	if len(plugins.Inputs) != 3 {
-		t.Errorf("Should be 3 inputs got %d", len(plugins.Inputs))
-	}
-
-	if _, ok := plugins.Inputs[0].(*DummyInput); !ok {
-		t.Errorf("First input should be DummyInput")
-	}
-
-	if _, ok := plugins.Inputs[1].(*FileInput); !ok {
-		t.Errorf("Second input should be FileInput")
-	}
-
-	if len(plugins.Outputs) != 2 {
-		t.Errorf("Should be 2 output %d", len(plugins.Outputs))
-	}
-
-	if _, ok := plugins.Outputs[0].(*DummyOutput); !ok {
-		t.Errorf("First output should be DummyOutput")
-	}
-
-	if l, ok := plugins.Outputs[1].(*Limiter); ok {
-		if _, ok := l.plugin.(*HTTPOutput); !ok {
-			t.Errorf("HTTPOutput should be wrapped in limiter")
-		}
-	} else {
-		t.Errorf("Second output should be Limiter")
-	}
-
-}
diff --git a/version.go b/version.go
deleted file mode 100644
index cd449582..00000000
--- a/version.go
+++ /dev/null
@@ -1,4 +0,0 @@
-package goreplay
-
-// VERSION the current version of goreplay
-var VERSION = "1.3.0"