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zipper.go
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zipper.go
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package yomo
import (
"context"
"encoding/json"
"fmt"
"log"
"net/http"
"github.com/yomorun/yomo/core"
"github.com/yomorun/yomo/core/config"
"github.com/yomorun/yomo/pkg/logger"
)
const (
zipperLogPrefix = "\033[33m[yomo:zipper]\033[0m "
)
// Zipper is the orchestrator of yomo. There are two types of zipper:
// one is Upstream Zipper, which is used to connect to multiple downstream zippers,
// another one is Downstream Zipper (will call it as Zipper directly), which is used
// to connected by `Upstream Zipper`, `Source` and `Stream Function`
type Zipper interface {
// ConfigWorkflow will register workflows from config files to zipper.
ConfigWorkflow(conf string) error
// ConfigMesh will register edge-mesh config URL
ConfigMesh(url string) error
// ListenAndServe start zipper as server.
ListenAndServe() error
// AddDownstreamZipper will add downstream zipper.
AddDownstreamZipper(downstream Zipper) error
// Addr returns the listen address of zipper.
Addr() string
// Stats return insight data
Stats() int
// Close will close the zipper.
Close() error
// ReadConfigFile(conf string) error
// AddWorkflow(wf ...core.Workflow) error
// ConfigDownstream(opts ...interface{}) error
// Connect() error
// RemoveDownstreamZipper(downstream Zipper) error
// ListenAddr() string
}
// zipper is the implementation of Zipper interface.
type zipper struct {
token string
addr string
hasDownstreams bool
server *core.Server
client *core.Client
downstreamZippers []Zipper
}
var _ Zipper = &zipper{}
// NewZipperWithOptions create a zipper instance.
func NewZipperWithOptions(name string, opts ...Option) Zipper {
options := NewOptions(opts...)
zipper := createZipperServer(name, options)
zipper.ConfigMesh(options.MeshConfigURL)
return zipper
}
// NewZipper create a zipper instance from config files.
func NewZipper(conf string) (Zipper, error) {
config, err := config.ParseWorkflowConfig(conf)
if err != nil {
logger.Errorf("%s[ERR] %v", zipperLogPrefix, err)
return nil, err
}
// listening address
listenAddr := fmt.Sprintf("%s:%d", config.Host, config.Port)
options := NewOptions()
options.ZipperAddr = listenAddr
zipper := createZipperServer(config.Name, options)
// zipper workflow
err = zipper.configWorkflow(config)
return zipper, err
}
// NewDownstreamZipper create a zipper descriptor for downstream zipper.
func NewDownstreamZipper(name string, opts ...Option) Zipper {
options := NewOptions(opts...)
client := core.NewClient(name, core.ClientTypeUpstreamZipper, options.ClientOptions...)
return &zipper{
token: name,
addr: options.ZipperAddr,
client: client,
}
}
/*************** Server ONLY ***************/
// createZipperServer create a zipper instance as server.
func createZipperServer(name string, options *Options) *zipper {
// create underlying QUIC server
srv := core.NewServer(name, options.ServerOptions...)
z := &zipper{
server: srv,
token: name,
addr: options.ZipperAddr,
}
// initialize
z.init()
return z
}
// ConfigWorkflow will read workflows from config files and register them to zipper.
func (z *zipper) ConfigWorkflow(conf string) error {
config, err := config.ParseWorkflowConfig(conf)
if err != nil {
logger.Errorf("%s[ERR] %v", zipperLogPrefix, err)
return err
}
return z.configWorkflow(config)
}
func (z *zipper) configWorkflow(config *config.WorkflowConfig) error {
for i, app := range config.Functions {
if err := z.server.AddWorkflow(core.Workflow{Seq: i, Token: app.Name}); err != nil {
return err
}
logger.Printf("%s[AddWorkflow] %d, %s", zipperLogPrefix, i, app.Name)
}
return nil
}
func (z *zipper) ConfigMesh(url string) error {
if url == "" {
return nil
}
logger.Printf("%sDownloading mesh config...", zipperLogPrefix)
// download mesh conf
res, err := http.Get(url)
if err != nil {
return err
}
defer res.Body.Close()
decoder := json.NewDecoder(res.Body)
var configs []config.MeshZipper
err = decoder.Decode(&configs)
if err != nil {
logger.Errorf("%s✅ downloaded the Mesh config with err=%v", zipperLogPrefix, err)
return err
}
logger.Printf("%s✅ Successfully downloaded the Mesh config. ", zipperLogPrefix)
if len(configs) == 0 {
return nil
}
for _, downstream := range configs {
if downstream.Name == z.token {
continue
}
addr := fmt.Sprintf("%s:%d", downstream.Host, downstream.Port)
z.AddDownstreamZipper(NewDownstreamZipper(downstream.Name, WithZipperAddr(addr)))
}
return nil
}
// ListenAndServe will start zipper service.
func (z *zipper) ListenAndServe() error {
logger.Debugf("%sCreating Zipper Server ...", zipperLogPrefix)
// check downstream zippers
for _, ds := range z.downstreamZippers {
if dsZipper, ok := ds.(*zipper); ok {
go func(dsZipper *zipper) {
dsZipper.client.Connect(context.Background(), dsZipper.addr)
z.server.AddDownstreamServer(dsZipper.addr, dsZipper.client)
}(dsZipper)
}
}
return z.server.ListenAndServe(context.Background(), z.addr)
}
// AddDownstreamZipper will add downstream zipper.
func (z *zipper) AddDownstreamZipper(downstream Zipper) error {
logger.Debugf("%sAddDownstreamZipper: %v", zipperLogPrefix, downstream)
z.downstreamZippers = append(z.downstreamZippers, downstream)
z.hasDownstreams = true
logger.Debugf("%scurrent downstreams: %d", zipperLogPrefix, len(z.downstreamZippers))
return nil
}
// RemoveDownstreamZipper remove downstream zipper.
func (z *zipper) RemoveDownstreamZipper(downstream Zipper) error {
index := -1
for i, v := range z.downstreamZippers {
if v.Addr() == downstream.Addr() {
index = i
break
}
}
// remove from slice
z.downstreamZippers = append(z.downstreamZippers[:index], z.downstreamZippers[index+1:]...)
return nil
}
// Addr returns listen address of zipper.
func (z *zipper) Addr() string {
return z.addr
}
// Close will close a connection. If zipper is Server, close the server. If zipper is Client, close the client.
func (z *zipper) Close() error {
if z.server != nil {
if err := z.server.Close(); err != nil {
logger.Errorf("%s Close(): %v", zipperLogPrefix, err)
return err
}
}
if z.client != nil {
if err := z.client.Close(); err != nil {
logger.Errorf("%s Close(): %v", zipperLogPrefix, err)
return err
}
}
return nil
}
// Stats inspects current server.
func (z *zipper) Stats() int {
log.Printf("[%s] all sfn connected: %d", z.token, len(z.server.StatsFunctions()))
for k, v := range z.server.StatsFunctions() {
ids := make([]int64, 0)
for _, c := range v {
ids = append(ids, int64((*c).StreamID()))
}
log.Printf("[%s] -> k=%v, v.StreamID=%v", z.token, k, ids)
}
log.Printf("[%s] all downstream zippers connected: %d", z.token, len(z.server.Downstreams()))
for k, v := range z.server.Downstreams() {
log.Printf("[%s] |> [%s] %s", z.token, k, v.ServerAddr())
}
log.Printf("[%s] total DataFrames received: %d", z.token, z.server.StatsCounter())
return len(z.server.StatsFunctions())
}