Split client app into cmd and daemon service (#239)

client/cmd/service_controller.go

@@ -1,23 +1,60 @@
 package cmd
 
 import (
+	"net"
+	"os"
+	"strings"
+	"time"
+
 	"github.com/kardianos/service"
 	log "github.com/sirupsen/logrus"
+
 	"github.com/spf13/cobra"
+	"github.com/wiretrustee/wiretrustee/client/proto"
+	"github.com/wiretrustee/wiretrustee/client/server"
 	"github.com/wiretrustee/wiretrustee/util"
-	"time"
+	"google.golang.org/grpc"
 )
 
-func (p *program) Start(service.Service) error {
-
+func (p *program) Start(svc service.Service) error {
 	// Start should not block. Do the actual work async.
 	log.Info("starting service") //nolint
 	go func() {
-		err := runClient()
-		if err != nil {
-			log.Errorf("stopped Wiretrustee client app due to error: %v", err)
+		// in any case, even if configuration does not exists we run daemon to serve CLI gRPC API.
+		p.serv = grpc.NewServer()
+
+		split := strings.Split(daemonAddr, "://")
+		switch split[0] {
+		case "unix":
+			// cleanup failed close
+			stat, err := os.Stat(split[1])
+			if err == nil && !stat.IsDir() {
+				if err := os.Remove(split[1]); err != nil {
+					log.Debugf("remove socket file: %v", err)
+				}
+			}
+		case "tcp":
+		default:
+			log.Errorf("unsupported daemon address protocol: %v", split[0])
 			return
 		}
+
+		listen, err := net.Listen(split[0], split[1])
+		if err != nil {
+			log.Fatalf("failed to listen daemon interface: %v", err)
+		}
+		defer listen.Close()
+
+		serverInstance := server.New(p.ctx, managementURL, configPath, stopCh, cleanupCh)
+		if err := serverInstance.Start(); err != nil {
+			log.Fatalf("failed start daemon: %v", err)
+		}
+		proto.RegisterDaemonServiceServer(p.serv, serverInstance)
+
+		log.Printf("started daemon server: %v", split[1])
+		if err := p.serv.Serve(listen); err != nil {
+			log.Errorf("failed to serve daemon requests: %v", err)
+		}
 	}()
 	return nil
 }
@@ -27,6 +64,11 @@ func (p *program) Stop(service.Service) error {
 		stopCh <- 1
 	}()
 
+	// stop CLI daemon service
+	if p.serv != nil {
+		p.serv.GracefulStop()
+	}
+
 	select {
 	case <-cleanupCh:
 	case <-time.After(time.Second * 10):
@@ -36,117 +78,104 @@ func (p *program) Stop(service.Service) error {
 	return nil
 }
 
-var (
-	runCmd = &cobra.Command{
-		Use:   "run",
-		Short: "runs wiretrustee as service",
-		Run: func(cmd *cobra.Command, args []string) {
-			SetFlagsFromEnvVars()
+var runCmd = &cobra.Command{
+	Use:   "run",
+	Short: "runs wiretrustee as service",
+	Run: func(cmd *cobra.Command, args []string) {
+		SetFlagsFromEnvVars()
 
-			err := util.InitLog(logLevel, logFile)
-			if err != nil {
-				log.Errorf("failed initializing log %v", err)
-				return
-			}
+		err := util.InitLog(logLevel, logFile)
+		if err != nil {
+			log.Errorf("failed initializing log %v", err)
+			return
+		}
 
-			SetupCloseHandler()
+		SetupCloseHandler()
 
-			prg := &program{
-				cmd:  cmd,
-				args: args,
-			}
+		s, err := newSVC(newProgram(cmd, args), newSVCConfig())
+		if err != nil {
+			cmd.PrintErrln(err)
+			return
+		}
+		err = s.Run()
+		if err != nil {
+			cmd.PrintErrln(err)
+			return
+		}
+		cmd.Printf("Wiretrustee service is running")
+	},
+}
 
-			s, err := newSVC(prg, newSVCConfig())
-			if err != nil {
-				cmd.PrintErrln(err)
-				return
-			}
-			err = s.Run()
-			if err != nil {
-				cmd.PrintErrln(err)
-				return
-			}
-			cmd.Printf("Wiretrustee service is running")
-		},
-	}
-)
+var startCmd = &cobra.Command{
+	Use:   "start",
+	Short: "starts wiretrustee service",
+	RunE: func(cmd *cobra.Command, args []string) error {
+		SetFlagsFromEnvVars()
 
-var (
-	startCmd = &cobra.Command{
-		Use:   "start",
-		Short: "starts wiretrustee service",
-		RunE: func(cmd *cobra.Command, args []string) error {
-			SetFlagsFromEnvVars()
+		err := util.InitLog(logLevel, logFile)
+		if err != nil {
+			log.Errorf("failed initializing log %v", err)
+			return err
+		}
+		s, err := newSVC(newProgram(cmd, args), newSVCConfig())
+		if err != nil {
+			cmd.PrintErrln(err)
+			return err
+		}
+		err = s.Start()
+		if err != nil {
+			cmd.PrintErrln(err)
+			return err
+		}
+		cmd.Println("Wiretrustee service has been started")
+		return nil
+	},
+}
 
-			err := util.InitLog(logLevel, logFile)
-			if err != nil {
-				log.Errorf("failed initializing log %v", err)
-				return err
-			}
-			s, err := newSVC(&program{}, newSVCConfig())
-			if err != nil {
-				cmd.PrintErrln(err)
-				return err
-			}
-			err = s.Start()
-			if err != nil {
-				cmd.PrintErrln(err)
-				return err
-			}
-			cmd.Println("Wiretrustee service has been started")
-			return nil
-		},
-	}
-)
+var stopCmd = &cobra.Command{
+	Use:   "stop",
+	Short: "stops wiretrustee service",
+	Run: func(cmd *cobra.Command, args []string) {
+		SetFlagsFromEnvVars()
 
-var (
-	stopCmd = &cobra.Command{
-		Use:   "stop",
-		Short: "stops wiretrustee service",
-		Run: func(cmd *cobra.Command, args []string) {
-			SetFlagsFromEnvVars()
+		err := util.InitLog(logLevel, logFile)
+		if err != nil {
+			log.Errorf("failed initializing log %v", err)
+		}
+		s, err := newSVC(newProgram(cmd, args), newSVCConfig())
+		if err != nil {
+			cmd.PrintErrln(err)
+			return
+		}
+		err = s.Stop()
+		if err != nil {
+			cmd.PrintErrln(err)
+			return
+		}
+		cmd.Println("Wiretrustee service has been stopped")
+	},
+}
 
-			err := util.InitLog(logLevel, logFile)
-			if err != nil {
-				log.Errorf("failed initializing log %v", err)
-			}
-			s, err := newSVC(&program{}, newSVCConfig())
-			if err != nil {
-				cmd.PrintErrln(err)
-				return
-			}
-			err = s.Stop()
-			if err != nil {
-				cmd.PrintErrln(err)
-				return
-			}
-			cmd.Println("Wiretrustee service has been stopped")
-		},
-	}
-)
+var restartCmd = &cobra.Command{
+	Use:   "restart",
+	Short: "restarts wiretrustee service",
+	Run: func(cmd *cobra.Command, args []string) {
+		SetFlagsFromEnvVars()
 
-var (
-	restartCmd = &cobra.Command{
-		Use:   "restart",
-		Short: "restarts wiretrustee service",
-		Run: func(cmd *cobra.Command, args []string) {
-			SetFlagsFromEnvVars()
-
-			err := util.InitLog(logLevel, logFile)
-			if err != nil {
-				log.Errorf("failed initializing log %v", err)
-			}
-			s, err := newSVC(&program{}, newSVCConfig())
-			if err != nil {
-				cmd.PrintErrln(err)
-				return
-			}
-			err = s.Restart()
-			if err != nil {
-				cmd.PrintErrln(err)
-				return
-			}
-			cmd.Println("Wiretrustee service has been restarted")
-		},
-	}
-)
+		err := util.InitLog(logLevel, logFile)
+		if err != nil {
+			log.Errorf("failed initializing log %v", err)
+		}
+		s, err := newSVC(newProgram(cmd, args), newSVCConfig())
+		if err != nil {
+			cmd.PrintErrln(err)
+			return
+		}
+		err = s.Restart()
+		if err != nil {
+			cmd.PrintErrln(err)
+			return
+		}
+		cmd.Println("Wiretrustee service has been restarted")
+	},
+}