Add --static-file flag to create a static file

The PR adds feature to create a static file with the
machine ID, auth, IP and other metadata when the `--static-file`
flag is passed
Closes #28

Signed-off-by: Utsav Anand <[email protected]>

cmd/create.go

@@ -6,10 +6,13 @@ package cmd
 import (
 	"encoding/base64"
 	"fmt"
+	"io/ioutil"
 	"strconv"
 	"strings"
 	"time"
 
+	"gopkg.in/yaml.v2"
+
 	"github.com/inlets/inletsctl/pkg/env"
 
 	"github.com/inlets/inletsctl/pkg/names"
@@ -23,6 +26,8 @@ import (
 const inletsControlPort = 8080
 const inletsProControlPort = 8123
 
+var staticFile bool
+
 func init() {
 
 	inletsCmd.AddCommand(createCmd)
@@ -44,6 +49,7 @@ func init() {
 	createCmd.Flags().StringP("remote-tcp", "c", "", `Remote host for inlets-pro to use for forwarding TCP connections`)
 
 	createCmd.Flags().DurationP("poll", "n", time.Second*2, "poll every N seconds, use a higher value if you encounter rate-limiting")
+	createCmd.Flags().BoolVarP(&staticFile, "static-file", "", false, "Create a static file for the provisioned machine")
 }
 
 // clientCmd represents the client sub command.
@@ -204,6 +210,18 @@ func runCreate(cmd *cobra.Command, _ []string) error {
 			i+1, max, hostStatus.ID, hostStatus.Status)
 
 		if hostStatus.Status == "active" {
+
+			// Creaye a static file named host-name-inletsctl.yaml
+			staticFile, _ := cmd.Flags().GetBool("static-file")
+
+			// If user has passed a fileName to the `-f` flag
+			if staticFile {
+				err := createStaticFile(provider, hostReq, hostStatus, inletsToken, pro)
+				if err != nil {
+					return err
+				}
+			}
+
 			if !pro {
 				fmt.Printf(`Inlets OSS exit-node summary:
   IP: %s
@@ -397,3 +415,49 @@ curl -sLO https://raw.githubusercontent.com/inlets/inlets/master/hack/inlets-pro
   systemctl start inlets-pro && \
   systemctl enable inlets-pro`
 }
+
+func createStaticFile(provider string, reqHost *provision.BasicHost, provisionedHost *provision.ProvisionedHost, inletsToken string, pro bool) error {
+	type Metadata struct {
+		CreatedAt string `yaml:"created_at,omitempty"`
+		Provider  string `yaml:"provider,omitempty"`
+		Region    string `yaml:"region,omitempty"`
+		Zone      string `yaml:"zone,omitempty"`
+	}
+	type Host struct {
+		Metadata  *Metadata `yaml:"metadata,omitempty"`
+		IP        string    `yaml:"ip,omitempty"`
+		ID        string    `yaml:"id,omitempty"`
+		AuthToken string    `yaml:"auth_token,omitempty"`
+		pro       bool      `yaml:"pro,omitempty"`
+	}
+	type staticFile struct {
+		Host *Host `yaml:"host,omitempty"`
+	}
+
+	fileStruct := &staticFile{
+		Host: &Host{
+			Metadata: &Metadata{
+				CreatedAt: time.Now().String(),
+				Provider:  provider,
+				Region:    reqHost.Region,
+				Zone:      reqHost.Additional["zone"],
+			},
+			IP:        provisionedHost.IP,
+			ID:        provisionedHost.ID,
+			AuthToken: inletsToken,
+			pro:       pro,
+		},
+	}
+
+	out, err := yaml.Marshal(fileStruct)
+	if err != nil {
+		return fmt.Errorf("cannot marshal struct: %v", err)
+	}
+
+	fileName := fmt.Sprintf("%s-inletsctl.yaml", provisionedHost.ID)
+	err = ioutil.WriteFile(fileName, out, 0666)
+	if err != nil {
+		return fmt.Errorf("cannot write to file: %s Error: %v", fileName, err)
+	}
+	return nil
+}

go.mod

@@ -12,6 +12,7 @@ require (
 	github.com/alexellis/go-execute v0.0.0-20191029181357-d17947259f74
 	github.com/aws/aws-sdk-go v1.26.8
 	github.com/digitalocean/godo v1.27.0
+	github.com/go-yaml/yaml v2.1.0+incompatible
 	github.com/golang/groupcache v0.0.0-20191027212112-611e8accdfc9 // indirect
 	github.com/google/uuid v1.1.1
 	github.com/morikuni/aec v1.0.0
@@ -29,5 +30,5 @@ require (
 	google.golang.org/appengine v1.6.5 // indirect
 	google.golang.org/genproto v0.0.0-20191115221424-83cc0476cb11 // indirect
 	google.golang.org/grpc v1.25.1 // indirect
-	gopkg.in/yaml.v2 v2.2.7 // indirect
+	gopkg.in/yaml.v2 v2.2.7
 )

go.sum

@@ -70,6 +70,8 @@ github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymF
 github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
 github.com/go-gl/glfw v0.0.0-20190409004039-e6da0acd62b1/go.mod h1:vR7hzQXu2zJy9AVAgeJqvqgH9Q5CA+iKCZ2gyEVpxRU=
+github.com/go-yaml/yaml v2.1.0+incompatible h1:RYi2hDdss1u4YE7GwixGzWwVo47T8UQwnTLB6vQiq+o=
+github.com/go-yaml/yaml v2.1.0+incompatible/go.mod h1:w2MrLa16VYP0jy6N7M5kHaCkaLENm+P+Tv+MfurjSw0=
 github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b h1:VKtxabqXZkF25pY9ekfRL6a582T4P37/31XEstQ5p58=
 github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
 github.com/golang/groupcache v0.0.0-20190702054246-869f871628b6/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=