Initial commit, pt. 47

cmd/streamd/main.go

@@ -40,7 +40,9 @@ func main() {
 	netPprofAddr := pflag.String("go-net-pprof-addr", "", "address to listen to for net/pprof requests")
 	cpuProfile := pflag.String("go-profile-cpu", "", "file to write cpu profile to")
 	heapProfile := pflag.String("go-profile-heap", "", "file to write memory profile to")
+	sentryDSN := pflag.String("sentry-dsn", "", "DSN of a Sentry instance to send error reports")
 	pflag.Parse()
+
 	l := logrus.Default().WithLevel(loggerLevel)
 
 	if *cpuProfile != "" {
@@ -84,6 +86,24 @@ func main() {
 
 	ctx := context.Background()
 	ctx = logger.CtxWithLogger(ctx, l)
+
+	if *sentryDSN != "" {
+		l.Infof("setting up Sentry at DSN '%s'", *sentryDSN)
+		sentryClient, err := sentry.NewClient(sentry.ClientOptions{
+			Dsn: *sentryDSN,
+		})
+		if err != nil {
+			l.Fatal(err)
+		}
+		sentryErrorMonitor := errmonsentry.New(sentryClient)
+		ctx = errmon.CtxWithErrorMonitor(ctx, sentryErrorMonitor)
+
+		l = l.WithPreHooks(observability.NewErrorMonitorLoggerHook(
+			sentryErrorMonitor,
+		))
+		ctx = logger.CtxWithLogger(ctx, l)
+	}
+
 	logger.Default = func() logger.Logger {
 		return l
 	}
@@ -134,27 +154,6 @@ func main() {
 			l.Fatalf("unable to initialize the streamd instance: %v", err)
 		}
 
-		l := l
-		if streamD.Config.SentryDSN != "" {
-			l.Infof("setting up Sentry at DSN '%s'", streamD.Config.SentryDSN)
-			sentryClient, err := sentry.NewClient(sentry.ClientOptions{
-				Dsn: streamD.Config.SentryDSN,
-			})
-			if err != nil {
-				l.Fatal(err)
-			}
-			sentryErrorMonitor := errmonsentry.New(sentryClient)
-			ctx = errmon.CtxWithErrorMonitor(ctx, sentryErrorMonitor)
-
-			l = l.WithPreHooks(observability.NewErrorMonitorLoggerHook(
-				sentryErrorMonitor,
-			))
-			ctx = logger.CtxWithLogger(ctx, l)
-			logger.Default = func() logger.Logger {
-				return l
-			}
-		}
-
 		go func() {
 			if err = streamD.Run(ctx); err != nil {
 				l.Errorf("streamd returned an error: %v", err)

cmd/streampanel/context.go

@@ -0,0 +1,50 @@
+package main
+
+import (
+	"context"
+	"os"
+
+	"github.com/facebookincubator/go-belt/tool/experimental/errmon"
+	errmonsentry "github.com/facebookincubator/go-belt/tool/experimental/errmon/implementation/sentry"
+	"github.com/facebookincubator/go-belt/tool/logger"
+	"github.com/facebookincubator/go-belt/tool/logger/implementation/logrus"
+	"github.com/getsentry/sentry-go"
+	"github.com/xaionaro-go/streamctl/pkg/observability"
+)
+
+func getContext(flags Flags) context.Context {
+	ctx := context.Background()
+
+	ll := logrus.DefaultLogrusLogger()
+	l := logrus.New(ll).WithLevel(flags.LoggerLevel)
+
+	if flags.LogFile != "" {
+		f, err := os.OpenFile(flags.LogFile, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0750)
+		if err != nil {
+			l.Errorf("failed to open log file '%s': %v", flags.LogFile, err)
+		}
+		ll.SetOutput(f)
+	}
+
+	if flags.SentryDSN != "" {
+		l.Infof("setting up Sentry at DSN '%s'", flags.SentryDSN)
+		sentryClient, err := sentry.NewClient(sentry.ClientOptions{
+			Dsn: flags.SentryDSN,
+		})
+		if err != nil {
+			l.Fatal(err)
+		}
+		sentryErrorMonitor := errmonsentry.New(sentryClient)
+		ctx = errmon.CtxWithErrorMonitor(ctx, sentryErrorMonitor)
+		l = l.WithPreHooks(observability.NewErrorMonitorLoggerHook(
+			sentryErrorMonitor,
+		))
+	}
+
+	ctx = logger.CtxWithLogger(ctx, l)
+	logger.Default = func() logger.Logger {
+		return l
+	}
+
+	return ctx
+}

cmd/streampanel/flag.go

@@ -0,0 +1,87 @@
+package main
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/facebookincubator/go-belt/tool/logger"
+	"github.com/spf13/pflag"
+	"github.com/xaionaro-go/streamctl/pkg/mainprocess"
+	"github.com/xaionaro-go/streamctl/pkg/streampanel/consts"
+)
+
+type Flags struct {
+	LoggerLevel  logger.Level
+	ListenAddr   string
+	RemoteAddr   string
+	ConfigPath   string
+	NetPprofAddr string
+	CPUProfile   string
+	HeapProfile  string
+	SentryDSN    string
+	Page         string
+	LogFile      string
+	Subprocess   string
+	SplitProcess bool
+}
+
+func parseFlags() Flags {
+	loggerLevel := logger.LevelWarning
+	pflag.Var(&loggerLevel, "log-level", "Log level")
+	listenAddr := pflag.String("listen-addr", "", "the address to listen for incoming connections to")
+	remoteAddr := pflag.String("remote-addr", "", "the address (for example 127.0.0.1:3594) of streamd to connect to, instead of running the stream controllers locally")
+	configPath := pflag.String("config-path", "~/.streampanel.yaml", "the path to the config file")
+	netPprofAddr := pflag.String("go-net-pprof-addr", "", "address to listen to for net/pprof requests")
+	cpuProfile := pflag.String("go-profile-cpu", "", "file to write cpu profile to")
+	heapProfile := pflag.String("go-profile-heap", "", "file to write memory profile to")
+	sentryDSN := pflag.String("sentry-dsn", "", "DSN of a Sentry instance to send error reports")
+	page := pflag.String("page", string(consts.PageControl), "DSN of a Sentry instance to send error reports")
+	logFile := pflag.String("log-file", "", "log file to write logs into")
+	subprocess := pflag.String("subprocess", "", "[internal use flag] run a specific sub-process (format: processName:addressToConnect)")
+	splitProcess := pflag.Bool("split-process", !isMobile(), "split the process into multiple processes for better stability")
+	pflag.Parse()
+
+	return Flags{
+		LoggerLevel:  loggerLevel,
+		ListenAddr:   *listenAddr,
+		RemoteAddr:   *remoteAddr,
+		ConfigPath:   *configPath,
+		NetPprofAddr: *netPprofAddr,
+		CPUProfile:   *cpuProfile,
+		HeapProfile:  *heapProfile,
+		SentryDSN:    *sentryDSN,
+		Page:         *page,
+		LogFile:      *logFile,
+		Subprocess:   *subprocess,
+		SplitProcess: *splitProcess,
+	}
+}
+
+type GetFlags struct{}
+type GetFlagsResult struct {
+	Flags Flags
+}
+
+func getFlags(
+	ctx context.Context,
+	mainProcess *mainprocess.Client,
+) Flags {
+	err := mainProcess.SendMessage(ctx, "main", GetFlags{})
+	assertNoError(err)
+
+	var flags Flags
+	err = mainProcess.ReadOne(
+		ctx,
+		func(ctx context.Context, source mainprocess.ProcessName, content any) error {
+			result, ok := content.(GetFlagsResult)
+			if !ok {
+				return fmt.Errorf("got unexpected type '%T' instead of %T", content, GetFlagsResult{})
+			}
+			flags = result.Flags
+			return nil
+		},
+	)
+	assertNoError(err)
+
+	return flags
+}

cmd/streampanel/fork.go

@@ -0,0 +1,186 @@
+package main
+
+import (
+	"context"
+	"encoding/gob"
+	"fmt"
+	"os"
+	"os/exec"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/facebookincubator/go-belt/tool/logger"
+	"github.com/xaionaro-go/streamctl/pkg/mainprocess"
+)
+
+type ProcessName = mainprocess.ProcessName
+
+const (
+	ProcessNameMain    = ProcessName("main")
+	ProcessNameStreamd = ProcessName("streamd")
+	ProcessNameUI      = ProcessName("ui")
+)
+
+var forkLocker sync.Mutex
+var forkMap = map[ProcessName]*exec.Cmd{}
+
+func getFork(procName ProcessName) *exec.Cmd {
+	forkLocker.Lock()
+	defer forkLocker.Unlock()
+	return forkMap[procName]
+}
+
+func setFork(procName ProcessName, f *exec.Cmd) {
+	forkLocker.Lock()
+	defer forkLocker.Unlock()
+	forkMap[procName] = f
+}
+
+func init() {
+	gob.Register(StreamDDied{})
+	gob.Register(GetFlags{})
+	gob.Register(GetFlagsResult{})
+	gob.Register(GetStreamdAddress{})
+	gob.Register(GetStreamdAddressResult{})
+}
+
+const (
+	EnvPassword = "STREAMPANEL_PASSWORD"
+)
+
+func runSubprocess(
+	ctx context.Context,
+	subprocessFlag string,
+) {
+	parts := strings.SplitN(subprocessFlag, ":", 2)
+	if len(parts) != 2 {
+		logger.Fatalf(ctx, "expected 2 parts in --subprocess: name and address, separated via a colon")
+	}
+	procName := ProcessName(parts[0])
+	addr := parts[1]
+	switch procName {
+	case ProcessNameStreamd:
+		forkStreamd(ctx, addr, os.Getenv(EnvPassword))
+	case ProcessNameUI:
+		forkUI(ctx, addr, os.Getenv(EnvPassword))
+	}
+}
+
+func runSplitProcesses(
+	ctx context.Context,
+	flags Flags,
+) {
+	procList := []ProcessName{
+		ProcessNameUI,
+	}
+	if flags.RemoteAddr == "" {
+		procList = append(procList, ProcessNameStreamd)
+	}
+
+	var m *mainprocess.Manager
+	var err error
+	m, err = mainprocess.NewManager(
+		func(
+			ctx context.Context,
+			procName ProcessName,
+			addr string,
+			password string,
+			isRestart bool,
+		) error {
+
+			f := getFork(procName)
+			if f != nil {
+				time.Sleep(time.Millisecond * 100)
+				//f.Process.Kill()
+				logger.Debugf(ctx, "waiting for process '%s' to die", procName)
+				f.Wait()
+			}
+
+			logger.Infof(ctx, "running process '%s'", procName)
+			err := runFork(ctx, flags, procName, addr, password)
+			if err != nil {
+				panic(err)
+			}
+			if isRestart && flags.RemoteAddr == "" {
+				switch procName {
+				case ProcessNameStreamd:
+					err := m.SendMessage(ctx, ProcessNameUI, StreamDDied{})
+					if err != nil {
+						logger.Errorf(ctx, "failed to send a StreamDDied message to '%s': %v", ProcessNameUI, err)
+					}
+				}
+			}
+			return nil
+		},
+		procList...,
+	)
+	if err != nil {
+		logger.Fatalf(ctx, "failed to start process manager: %v", err)
+	}
+	defer m.Close()
+	go m.Serve(ctx, func(ctx context.Context, source mainprocess.ProcessName, content any) error {
+		switch content.(type) {
+		case GetFlags:
+			msg := GetFlagsResult{
+				Flags: flags,
+			}
+			err := m.SendMessage(ctx, source, msg)
+			if err != nil {
+				logger.Errorf(ctx, "failed to send message %#+v to '%s': %v", msg, source, err)
+			}
+		}
+		return nil
+	})
+	go func() {
+		select {
+		case <-ctx.Done():
+			return
+		case <-time.After(10 * time.Second):
+		}
+
+		err := m.VerifyEverybodyConnected(ctx)
+		if err != nil {
+			logger.Fatalf(ctx, "%s", err)
+		}
+	}()
+
+	<-ctx.Done()
+}
+
+const debugDontFork = false
+
+func runFork(
+	ctx context.Context,
+	flags Flags,
+	procName ProcessName,
+	addr, password string,
+) error {
+	logger.Debugf(ctx, "running fork: '%s' '%s' '%s'", procName, addr, password)
+	defer logger.Debugf(ctx, "/running fork: '%s' '%s' '%s'", procName, addr, password)
+	if debugDontFork {
+		return fakeFork(ctx, procName, addr, password)
+	}
+	os.Setenv(EnvPassword, password)
+	args := []string{os.Args[0], "--sentry-dsn=" + flags.SentryDSN, "--log-level=" + flags.LoggerLevel.String(), "--subprocess=" + string(procName) + ":" + addr}
+	logger.Infof(ctx, "running '%s %s'", args[0], strings.Join(args[1:], " "))
+	cmd := exec.Command(args[0], args[1:]...)
+	cmd.Stderr = os.Stderr
+	cmd.Stdout = os.Stdout
+	cmd.Stdin = os.Stdin
+	setFork(procName, cmd)
+	go cmd.Run()
+	return nil
+}
+
+func fakeFork(ctx context.Context, procName ProcessName, addr, password string) error {
+	switch procName {
+	case ProcessNameStreamd:
+		go forkUI(ctx, addr, password)
+		return nil
+	case ProcessNameUI:
+		go forkStreamd(ctx, addr, password)
+		return nil
+	}
+	return fmt.Errorf("unexpected process name: %s", procName)
+}

cmd/streampanel/is_mobile.go

@@ -0,0 +1,13 @@
+package main
+
+import (
+	"runtime"
+)
+
+func isMobile() bool {
+	switch runtime.GOOS {
+	case "android":
+		return true
+	}
+	return false
+}

cmd/streampanel/main.go

@@ -2,161 +2,54 @@ package main
 
 import (
 	"context"
-	"net"
-	"net/http"
 	_ "net/http/pprof"
-	"os"
-	"runtime"
-	"runtime/pprof"
 
 	"github.com/facebookincubator/go-belt"
-	"github.com/facebookincubator/go-belt/tool/experimental/errmon"
-	errmonsentry "github.com/facebookincubator/go-belt/tool/experimental/errmon/implementation/sentry"
 	"github.com/facebookincubator/go-belt/tool/logger"
-	"github.com/facebookincubator/go-belt/tool/logger/implementation/logrus"
-	"github.com/getsentry/sentry-go"
-	"github.com/kraken-hpc/go-fork"
-	"github.com/spf13/pflag"
-	"github.com/xaionaro-go/streamctl/pkg/observability"
 	"github.com/xaionaro-go/streamctl/pkg/streamcontrol"
 	"github.com/xaionaro-go/streamctl/pkg/streamd/grpc/go/streamd_grpc"
-	"github.com/xaionaro-go/streamctl/pkg/streamd/server"
 	"github.com/xaionaro-go/streamctl/pkg/streampanel"
-	"github.com/xaionaro-go/streamctl/pkg/streampanel/consts"
 	_ "github.com/xaionaro-go/streamctl/pkg/streamserver"
-	"google.golang.org/grpc"
 )
 
-func init() {
-	fork.RegisterFunc("streamd", streamd)
-	fork.Init()
-}
-
-func streamd(remoteAddr string) {
-
-}
-
 const forceNetPProfOnAndroid = true
 
 func main() {
-	loggerLevel := logger.LevelWarning
+	flags := parseFlags()
-	pflag.Var(&loggerLevel, "log-level", "Log level")
+	ctx := getContext(flags)
-	listenAddr := pflag.String("listen-addr", "", "the address to listen for incoming connections to")
-	remoteAddr := pflag.String("remote-addr", "", "the address (for example 127.0.0.1:3594) of streamd to connect to, instead of running the stream controllers locally")
-	configPath := pflag.String("config-path", "~/.streampanel.yaml", "the path to the config file")
-	netPprofAddr := pflag.String("go-net-pprof-addr", "", "address to listen to for net/pprof requests")
-	cpuProfile := pflag.String("go-profile-cpu", "", "file to write cpu profile to")
-	heapProfile := pflag.String("go-profile-heap", "", "file to write memory profile to")
-	sentryDSN := pflag.String("sentry-dsn", "", "DSN of a Sentry instance to send error reports")
-	page := pflag.String("page", string(consts.PageControl), "DSN of a Sentry instance to send error reports")
-	splitProcess := pflag.Bool("split-process", !isMobile(), "split the process into multiple processes for better stability")
-	pflag.Parse()
-
-	l := logrus.Default().WithLevel(loggerLevel)
-	logger.Default = func() logger.Logger {
-		return l
-	}
-
-	if *cpuProfile != "" {
-		f, err := os.Create(*cpuProfile)
-		if err != nil {
-			l.Fatalf("unable to create file '%s': %v", *cpuProfile, err)
-		}
-		defer f.Close()
-		if err := pprof.StartCPUProfile(f); err != nil {
-			l.Fatalf("unable to write to file '%s': %v", *cpuProfile, err)
-		}
-		defer pprof.StopCPUProfile()
-	}
-
-	if *heapProfile != "" {
-		f, err := os.Create(*heapProfile)
-		if err != nil {
-			l.Fatalf("unable to create file '%s': %v", *heapProfile, err)
-		}
-		defer f.Close()
-		runtime.GC()
-		if err := pprof.WriteHeapProfile(f); err != nil {
-			l.Fatalf("unable to write to file '%s': %v", *heapProfile, err)
-		}
-	}
-
-	if *netPprofAddr != "" || (forceNetPProfOnAndroid && runtime.GOOS == "android") {
-		go func() {
-			if *netPprofAddr == "" {
-				*netPprofAddr = "localhost:0"
-			}
-			l.Infof("starting to listen for net/pprof requests at '%s'", *netPprofAddr)
-			l.Error(http.ListenAndServe(*netPprofAddr, nil))
-		}()
-	}
-
-	if oldValue := runtime.GOMAXPROCS(0); oldValue < 16 {
-		l.Infof("increased GOMAXPROCS from %d to %d", oldValue, 16)
-		runtime.GOMAXPROCS(16)
-	}
-
-	if *splitProcess && *listenAddr == "" {
-		listenAddr = ptr("localhost:0")
-	}
-
-	listener, err := net.Listen("tcp", *listenAddr)
-	if err != nil {
-		l.Fatalf("failed to listen: %v", err)
-	}
-
-	if *splitProcess {
-		fork.Fork("streamd", listener.Addr().String())
-	}
-
-	ctx := context.Background()
-	go func() {
-		<-ctx.Done()
-		listener.Close()
-	}()
-
-	if *splitProcess && *remoteAddr == "" {
-		remoteAddr = ptr(listener.Addr().String())
-	}
-
-	var opts []streampanel.Option
-	if *remoteAddr != "" {
-		opts = append(opts, streampanel.OptionRemoteStreamDAddr(*remoteAddr))
-	}
-	if *sentryDSN != "" {
-		opts = append(opts, streampanel.OptionSentryDSN(*sentryDSN))
-	}
-	panel, panelErr := streampanel.New(*configPath, opts...)
-
-	if panel != nil && panel.Config.SentryDSN != "" {
-		l.Infof("setting up Sentry at DSN '%s'", panel.Config.SentryDSN)
-		sentryClient, err := sentry.NewClient(sentry.ClientOptions{
-			Dsn: panel.Config.SentryDSN,
-		})
-		if err != nil {
-			l.Fatal(err)
-		}
-		sentryErrorMonitor := errmonsentry.New(sentryClient)
-		ctx = errmon.CtxWithErrorMonitor(ctx, sentryErrorMonitor)
-		l = l.WithPreHooks(observability.NewErrorMonitorLoggerHook(
-			sentryErrorMonitor,
-		))
-	}
-
-	ctx = logger.CtxWithLogger(ctx, l)
-	logger.Default = func() logger.Logger {
-		return l
-	}
 	defer belt.Flush(ctx)
+	cancelFunc := initRuntime(ctx, flags, "main")
+	defer cancelFunc()
 
-	if panelErr != nil {
+	if flags.Subprocess != "" {
-		l.Fatal(panelErr)
+		runSubprocess(ctx, flags.Subprocess)
+		return
 	}
 
-	if *listenAddr != "" {
+	if flags.SplitProcess {
-		grpcServer := grpc.NewServer()
+		runSplitProcesses(ctx, flags)
-		streamdGRPC := server.NewGRPCServer(panel.StreamD)
+		return
-		streamd_grpc.RegisterStreamDServer(grpcServer, streamdGRPC)
+	}
+
+	runPanel(ctx, flags)
+}
+
+func runPanel(
+	ctx context.Context,
+	flags Flags,
+) {
+	var opts []streampanel.Option
+	if flags.RemoteAddr != "" {
+		opts = append(opts, streampanel.OptionRemoteStreamDAddr(flags.RemoteAddr))
+	}
+
+	panel, panelErr := streampanel.New(flags.ConfigPath, opts...)
+	if panelErr != nil {
+		logger.Fatal(ctx, panelErr)
+	}
+
+	if flags.ListenAddr != "" {
+		listener, grpcServer, streamdGRPC := initGRPCServer(ctx, panel.StreamD, flags.ListenAddr)
 
 		// to erase an oauth request answered locally from "UnansweredOAuthRequests" in the GRPC server:
 		panel.OnInternallySubmittedOAuthCode = func(
@@ -171,20 +64,18 @@ func main() {
 			return err
 		}
 
-		// start the server:
+		err := grpcServer.Serve(listener)
-		go func() {
-			l.Infof("started server at %s", *listenAddr)
-			err = grpcServer.Serve(listener)
 		if err != nil {
-				l.Fatal(err)
+			logger.Fatalf(ctx, "unable to server the gRPC server: %v", err)
 		}
-		}()
 	}
 
 	var loopOpts []streampanel.LoopOption
-	loopOpts = append(loopOpts, streampanel.LoopOptionStartingPage(*page))
+	if flags.Page != "" {
-	err = panel.Loop(ctx, loopOpts...)
+		loopOpts = append(loopOpts, streampanel.LoopOptionStartingPage(flags.Page))
+	}
+	err := panel.Loop(ctx, loopOpts...)
 	if err != nil {
-		l.Fatal(err)
+		logger.Fatal(ctx, err)
 	}
 }

cmd/streampanel/runtime.go

@@ -0,0 +1,63 @@
+package main
+
+import (
+	"context"
+	"net/http"
+	"os"
+	"runtime"
+	"runtime/pprof"
+
+	"github.com/facebookincubator/go-belt/tool/logger"
+)
+
+func initRuntime(ctx context.Context, flags Flags, _procName ProcessName) context.CancelFunc {
+	procName := string(_procName)
+	var closeFuncs []func()
+
+	l := logger.FromCtx(ctx)
+
+	if flags.CPUProfile != "" {
+		f, err := os.Create(flags.CPUProfile + "-" + procName)
+		if err != nil {
+			l.Fatalf("unable to create file '%s': %v", flags.CPUProfile+"-"+procName, err)
+		}
+		closeFuncs = append(closeFuncs, func() { f.Close() })
+		if err := pprof.StartCPUProfile(f); err != nil {
+			l.Fatalf("unable to write to file '%s': %v", flags.CPUProfile+"-"+procName, err)
+		}
+		closeFuncs = append(closeFuncs, pprof.StopCPUProfile)
+	}
+
+	if flags.HeapProfile != "" {
+		f, err := os.Create(flags.HeapProfile + "-" + procName)
+		if err != nil {
+			l.Fatalf("unable to create file '%s': %v", flags.HeapProfile+"-"+procName, err)
+		}
+		closeFuncs = append(closeFuncs, func() { f.Close() })
+		runtime.GC()
+		if err := pprof.WriteHeapProfile(f); err != nil {
+			l.Fatalf("unable to write to file '%s': %v", flags.HeapProfile+"-"+procName, err)
+		}
+	}
+
+	if flags.NetPprofAddr != "" || (forceNetPProfOnAndroid && runtime.GOOS == "android") {
+		go func() {
+			if flags.NetPprofAddr == "" {
+				flags.NetPprofAddr = "localhost:0"
+			}
+			l.Infof("starting to listen for net/pprof requests at '%s'", flags.NetPprofAddr)
+			l.Error(http.ListenAndServe(flags.NetPprofAddr, nil))
+		}()
+	}
+
+	if oldValue := runtime.GOMAXPROCS(0); oldValue < 16 {
+		l.Infof("increased GOMAXPROCS from %d to %d", oldValue, 16)
+		runtime.GOMAXPROCS(16)
+	}
+
+	return func() {
+		for i := len(closeFuncs) - 1; i >= 0; i-- {
+			closeFuncs[i]()
+		}
+	}
+}

cmd/streampanel/streamd.go

@@ -0,0 +1,150 @@
+package main
+
+import (
+	"context"
+	"net"
+	"os"
+	"sync"
+
+	"github.com/facebookincubator/go-belt"
+	"github.com/facebookincubator/go-belt/tool/experimental/errmon"
+	"github.com/facebookincubator/go-belt/tool/logger"
+	"github.com/xaionaro-go/streamctl/cmd/streamd/ui"
+	"github.com/xaionaro-go/streamctl/pkg/mainprocess"
+	"github.com/xaionaro-go/streamctl/pkg/streamcontrol"
+	"github.com/xaionaro-go/streamctl/pkg/streamd"
+	"github.com/xaionaro-go/streamctl/pkg/streamd/api"
+	"github.com/xaionaro-go/streamctl/pkg/streamd/config"
+	"github.com/xaionaro-go/streamctl/pkg/streamd/grpc/go/streamd_grpc"
+	"github.com/xaionaro-go/streamctl/pkg/streamd/server"
+	streampanelconfig "github.com/xaionaro-go/streamctl/pkg/streampanel/config"
+	"github.com/xaionaro-go/streamctl/pkg/xpath"
+	"google.golang.org/grpc"
+)
+
+func forkStreamd(ctx context.Context, mainProcessAddr, password string) {
+	procName := ProcessNameStreamd
+	ctx = belt.WithField(ctx, "process", procName)
+
+	mainProcess, err := mainprocess.NewClient(
+		procName,
+		mainProcessAddr,
+		password,
+	)
+	if err != nil {
+		panic(err)
+	}
+	flags := getFlags(ctx, mainProcess)
+	ctx = getContext(flags)
+	ctx = belt.WithField(ctx, "process", procName)
+	defer belt.Flush(ctx)
+	logger.Debugf(ctx, "flags == %#+v", flags)
+	cancelFunc := initRuntime(ctx, flags, procName)
+	defer cancelFunc()
+
+	runStreamd(ctx, flags)
+}
+
+func runStreamd(
+	ctx context.Context,
+	flags Flags,
+) {
+	logger.Debugf(ctx, "runStreamd: %#+v", flags)
+	defer logger.Debugf(ctx, "/runStreamd")
+	if flags.RemoteAddr != "" {
+		logger.Fatal(ctx, "not implemented")
+	}
+
+	configPath, err := xpath.Expand(flags.ConfigPath)
+	if err != nil {
+		logger.Fatal(ctx, err)
+	}
+
+	var cfg streampanelconfig.Config
+	err = streampanelconfig.ReadConfigFromPath(configPath, &cfg)
+	if err != nil {
+		logger.Fatalf(ctx, "unable to read the config from path '%s': %v", flags.ConfigPath, err)
+	}
+
+	var streamdGRPCLocker sync.Mutex
+
+	var streamdGRPC *server.GRPCServer
+	ui := ui.NewUI(
+		ctx,
+		func(listenPort uint16, platID streamcontrol.PlatformName, authURL string) bool {
+			logger.Tracef(ctx, "streamd.UI.OpenOAuthURL(%d, %s, '%s')", listenPort, platID, authURL)
+			defer logger.Tracef(ctx, "/streamd.UI.OpenOAuthURL(%d, %s, '%s')", listenPort, platID, authURL)
+
+			streamdGRPCLocker.Lock()
+			logger.Tracef(ctx, "streamdGRPCLocker.Lock()-ed")
+			defer logger.Tracef(ctx, "streamdGRPCLocker.Lock()-ed")
+			defer streamdGRPCLocker.Unlock()
+
+			err := streamdGRPC.OpenOAuthURL(ctx, listenPort, platID, authURL)
+			errmon.ObserveErrorCtx(ctx, err)
+			return err == nil
+		},
+		func(ctx context.Context, s string) {
+			logger.Infof(ctx, "restarting streamd")
+			os.Exit(0)
+		},
+	)
+
+	streamD, err := streamd.New(
+		cfg.BuiltinStreamD,
+		ui,
+		func(ctx context.Context, cfg config.Config) error {
+			return nil
+		},
+		belt.CtxBelt(ctx),
+	)
+	if err != nil {
+		logger.Fatalf(ctx, "unable to initialize streamd: %v", err)
+	}
+
+	var listener net.Listener
+	var grpcServer *grpc.Server
+	listener, grpcServer, streamdGRPC = initGRPCServer(ctx, streamD, flags.ListenAddr)
+
+	err = streamD.Run(ctx)
+	if err != nil {
+		logger.Fatalf(ctx, "unable to start streamd: %v", err)
+	}
+
+	err = grpcServer.Serve(listener)
+	if err != nil {
+		logger.Fatalf(ctx, "unable to server the gRPC server: %v", err)
+	}
+
+	logger.Fatalf(ctx, "internal error: was supposed to never reach this line")
+}
+
+func initGRPCServer(
+	ctx context.Context,
+	streamD api.StreamD,
+	listenAddr string,
+) (net.Listener, *grpc.Server, *server.GRPCServer) {
+	listener, err := net.Listen("tcp", listenAddr)
+	if err != nil {
+		logger.Fatalf(ctx, "failed to listen: %v", err)
+	}
+	go func() {
+		<-ctx.Done()
+		listener.Close()
+	}()
+
+	grpcServer := grpc.NewServer()
+	streamdGRPC := server.NewGRPCServer(streamD)
+	streamd_grpc.RegisterStreamDServer(grpcServer, streamdGRPC)
+
+	// start the server:
+	go func() {
+		logger.Infof(ctx, "started server at %s", listener.Addr().String())
+		err = grpcServer.Serve(listener)
+		if err != nil {
+			logger.Fatal(ctx, err)
+		}
+	}()
+
+	return listener, grpcServer, streamdGRPC
+}

cmd/streampanel/ui.go

@@ -0,0 +1,89 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"os"
+
+	"github.com/facebookincubator/go-belt"
+	"github.com/facebookincubator/go-belt/tool/logger"
+	"github.com/xaionaro-go/streamctl/pkg/mainprocess"
+)
+
+func forkUI(ctx context.Context, mainProcessAddr, password string) {
+	procName := ProcessNameUI
+	ctx = belt.WithField(ctx, "process", procName)
+
+	mainProcess, err := mainprocess.NewClient(
+		procName,
+		mainProcessAddr,
+		password,
+	)
+	if err != nil {
+		panic(err)
+	}
+	flags := getFlags(ctx, mainProcess)
+	ctx = getContext(flags)
+	ctx = belt.WithField(ctx, "process", procName)
+	defer belt.Flush(ctx)
+	logger.Debugf(ctx, "flags == %#+v", flags)
+	cancelFunc := initRuntime(ctx, flags, procName)
+	defer cancelFunc()
+
+	streamdAddr := getStreamDAddress(ctx, mainProcess)
+	go mainProcess.Serve(
+		ctx,
+		func(ctx context.Context, source mainprocess.ProcessName, content any) error {
+			switch content.(type) {
+			case StreamDDied:
+				os.Exit(0)
+			}
+			return nil
+		},
+	)
+
+	flags.RemoteAddr = streamdAddr
+	runPanel(ctx, flags)
+}
+
+type StreamDDied struct{}
+
+type GetStreamdAddress struct{}
+type GetStreamdAddressResult struct {
+	Address string
+}
+
+func getStreamDAddress(
+	ctx context.Context,
+	mainProcess *mainprocess.Client,
+) string {
+	err := mainProcess.SendMessage(ctx, "streamd", GetStreamdAddress{})
+	assertNoError(err)
+
+	var addr string
+	for {
+		readOnceMore := false
+		err = mainProcess.ReadOne(
+			ctx,
+			func(ctx context.Context, source mainprocess.ProcessName, content any) error {
+				switch msg := content.(type) {
+				case GetStreamdAddressResult:
+					addr = msg.Address
+				case StreamDDied:
+					readOnceMore = true
+				default:
+					return fmt.Errorf("got unexpected type '%T' instead of %T", content, GetStreamdAddressResult{})
+				}
+				return nil
+			},
+		)
+		assertNoError(err)
+
+		if readOnceMore {
+			continue
+		}
+		break
+	}
+
+	return addr
+}

cmd/streampanel/utils.go

@@ -0,0 +1,11 @@
+package main
+
+func ptr[T any](in T) *T {
+	return &in
+}
+
+func assertNoError(err error) {
+	if err != nil {
+		panic(err)
+	}
+}

go.mod

@@ -164,7 +164,6 @@ require (
 	github.com/spaolacci/murmur3 v1.1.0 // indirect
 	github.com/srwiley/oksvg v0.0.0-20221011165216-be6e8873101c // indirect
 	github.com/srwiley/rasterx v0.0.0-20220730225603-2ab79fcdd4ef // indirect
-	github.com/stretchr/testify v1.9.0 // indirect
 	github.com/vishvananda/netlink v1.1.1-0.20211118161826-650dca95af54 // indirect
 	github.com/vishvananda/netns v0.0.4 // indirect
 	github.com/whyrusleeping/go-keyspace v0.0.0-20160322163242-5b898ac5add1 // indirect
@@ -219,7 +218,6 @@ require (
 	github.com/hyprspace/hyprspace v0.10.1
 	github.com/immune-gmbh/attestation-sdk v0.0.0-20230711173209-f44e4502aeca
 	github.com/kbinani/screenshot v0.0.0-20230812210009-b87d31814237
-	github.com/kraken-hpc/go-fork v0.1.1
 	github.com/libp2p/go-libp2p v0.33.2
 	github.com/libp2p/go-libp2p-kad-dht v0.25.2
 	github.com/multiformats/go-multiaddr v0.12.3
@@ -228,6 +226,7 @@ require (
 	github.com/rs/zerolog v1.33.0
 	github.com/sethvargo/go-password v0.3.1
 	github.com/spf13/pflag v1.0.5
+	github.com/stretchr/testify v1.9.0
 	github.com/xaionaro-go/datacounter v1.0.4
 	github.com/xaionaro-go/unsafetools v0.0.0-20210722164218-75ba48cf7b3c
 	github.com/yl2chen/cidranger v1.0.2

go.sum

@@ -454,8 +454,6 @@ github.com/kr/pty v1.1.3/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
-github.com/kraken-hpc/go-fork v0.1.1 h1:O3X/ynoNy/eS7UIcZYef8ndFq2RXEIOue9kZqyzF0Sk=
-github.com/kraken-hpc/go-fork v0.1.1/go.mod h1:uu0e5h+V4ONH5Qk/xuVlyNXJXy/swhqGIEMK7w+9dNc=
 github.com/leodido/go-urn v1.2.1 h1:BqpAaACuzVSgi/VLzGZIobT2z4v53pjosyNd9Yv6n/w=
 github.com/leodido/go-urn v1.2.1/go.mod h1:zt4jvISO2HfUBqxjfIshjdMTYS56ZS/qv49ictyFfxY=
 github.com/libp2p/go-buffer-pool v0.1.0 h1:oK4mSFcQz7cTQIfqbe4MIj9gLW+mnanjyFtc6cdF0Y8=

pkg/mainprocess/client.go

@@ -12,14 +12,12 @@ import (
 type Client struct {
 	Conn     net.Conn
 	Password string
-	OnReceivedMessage OnReceivedMessageFunc
 }
 
 func NewClient(
-	myName string,
+	myName ProcessName,
 	addr string,
 	password string,
-	onReceivedMessage OnReceivedMessageFunc,
 ) (*Client, error) {
 	conn, err := net.Dial("tcp", addr)
 	if err != nil {
@@ -49,13 +47,12 @@ func NewClient(
 	return &Client{
 		Conn:     conn,
 		Password: password,
-		OnReceivedMessage: onReceivedMessage,
 	}, nil
 }
 
 func (c *Client) SendMessage(
 	ctx context.Context,
-	dst string,
+	dst ProcessName,
 	content any,
 ) error {
 	encoder := gob.NewEncoder(c.Conn)
@@ -76,7 +73,10 @@ func (c *Client) Close() error {
 	return c.Conn.Close()
 }
 
-func (c *Client) Serve(ctx context.Context) error {
+func (c *Client) Serve(
+	ctx context.Context,
+	onReceivedMessage OnReceivedMessageFunc,
+) error {
 	ctx, cancelFn := context.WithCancel(ctx)
 	defer cancelFn()
 	go func() {
@@ -94,6 +94,16 @@ func (c *Client) Serve(ctx context.Context) error {
 		default:
 		}
 
+		if err := c.ReadOne(ctx, onReceivedMessage); err != nil {
+			return err
+		}
+	}
+}
+
+func (c *Client) ReadOne(
+	ctx context.Context,
+	onReceivedMessage OnReceivedMessageFunc,
+) error {
 	var msg MessageFromMain
 	decoder := gob.NewDecoder(c.Conn)
 	err := decoder.Decode(&msg)
@@ -101,19 +111,9 @@ func (c *Client) Serve(ctx context.Context) error {
 		return fmt.Errorf("unable to receive&decode message: %w", err)
 	}
 
-		if err := c.onReceivedMessage(ctx, msg); err != nil {
+	if err := onReceivedMessage(ctx, msg.Source, msg.Content); err != nil {
-			logger.Error(ctx, err)
+		return fmt.Errorf("unable to process the message '%#+v': %w", msg, err)
-		}
-	}
-}
-
-func (c *Client) onReceivedMessage(
-	ctx context.Context,
-	msg MessageFromMain,
-) error {
-	if c.OnReceivedMessage == nil {
-		return fmt.Errorf("OnReceivedMessage function is not set")
 	}
 
-	return c.OnReceivedMessage(ctx, msg.Source, msg.Content)
+	return nil
 }

pkg/mainprocess/main_process.go

@@ -15,26 +15,34 @@ import (
 
 type OnReceivedMessageFunc func(
 	ctx context.Context,
-	source string,
+	source ProcessName,
 	content any,
 ) error
 
+type LaunchClientFunc func(
+	ctx context.Context,
+	procName ProcessName,
+	addr string,
+	password string,
+	isRestart bool,
+) error
+
 type Manager struct {
 	listener net.Listener
 	password string
 
 	connsLocker  sync.Mutex
-	conns        map[string]net.Conn
+	conns        map[ProcessName]net.Conn
 	connsChanged chan struct{}
 
-	allClientProcesses []string
+	allClientProcesses []ProcessName
 
-	OnReceivedMessage OnReceivedMessageFunc
+	LaunchClient LaunchClientFunc
 }
 
 func NewManager(
-	onReceivedMessage OnReceivedMessageFunc,
+	launchClient LaunchClientFunc,
-	expectedClients ...string,
+	expectedClients ...ProcessName,
 ) (*Manager, error) {
 	listener, err := net.Listen("tcp", "localhost:0")
 	if err != nil {
@@ -47,12 +55,12 @@ func NewManager(
 	}
 
 	return &Manager{
-		OnReceivedMessage: onReceivedMessage,
+		LaunchClient: launchClient,
 
 		listener: listener,
 		password: password,
 
-		conns:        map[string]net.Conn{},
+		conns:        map[ProcessName]net.Conn{},
 		connsChanged: make(chan struct{}),
 
 		allClientProcesses: expectedClients,
@@ -71,7 +79,24 @@ func (m *Manager) Close() error {
 	return m.listener.Close()
 }
 
-func (m *Manager) Serve(ctx context.Context) error {
+func (m *Manager) VerifyEverybodyConnected(
+	ctx context.Context,
+) error {
+	m.connsLocker.Lock()
+	defer m.connsLocker.Unlock()
+
+	for _, name := range m.allClientProcesses {
+		if _, ok := m.conns[name]; !ok {
+			return fmt.Errorf("client '%s' is not connected", name)
+		}
+	}
+	return nil
+}
+
+func (m *Manager) Serve(
+	ctx context.Context,
+	onReceivedMessage OnReceivedMessageFunc,
+) error {
 	logger.Tracef(ctx, "serving listener at %s", m.listener.Addr())
 	defer logger.Tracef(ctx, "/serving listener at %s", m.listener.Addr())
 
@@ -86,6 +111,15 @@ func (m *Manager) Serve(ctx context.Context) error {
 		}
 	}()
 
+	if m.LaunchClient != nil {
+		for _, name := range m.allClientProcesses {
+			err := m.LaunchClient(ctx, name, m.listener.Addr().String(), m.password, false)
+			if err != nil {
+				return fmt.Errorf("unable to launch '%s': %w", name, err)
+			}
+		}
+	}
+
 	for {
 		select {
 		case <-ctx.Done():
@@ -99,22 +133,24 @@ func (m *Manager) Serve(ctx context.Context) error {
 		}
 		logger.Tracef(ctx, "accepted a connection from '%s'", conn.RemoteAddr())
 
-		m.addNewConnection(ctx, conn)
+		m.addNewConnection(ctx, conn, onReceivedMessage)
 	}
 }
 
 func (m *Manager) addNewConnection(
 	ctx context.Context,
 	conn net.Conn,
+	onReceivedMessage OnReceivedMessageFunc,
 ) {
 	go func() {
-		m.handleConnection(ctx, conn)
+		m.handleConnection(ctx, conn, onReceivedMessage)
 	}()
 }
 
 func (m *Manager) handleConnection(
 	ctx context.Context,
 	conn net.Conn,
+	onReceivedMessage OnReceivedMessageFunc,
 ) {
 	var regMessage RegistrationMessage
 	logger.Tracef(ctx, "handleConnection from %s", conn.RemoteAddr())
@@ -152,7 +188,7 @@ func (m *Manager) handleConnection(
 		logger.Error(ctx, err)
 		return
 	}
-	defer func(sourceName string) {
+	defer func(sourceName ProcessName) {
 		m.unregisterConnection(sourceName)
 	}(regMessage.Source)
 	if err := encoder.Encode(RegistrationResult{}); err != nil {
@@ -162,6 +198,16 @@ func (m *Manager) handleConnection(
 	}
 	ctx = belt.WithField(ctx, "client", regMessage.Source)
 
+	defer func() {
+		if m.LaunchClient == nil {
+			return
+		}
+		err := m.LaunchClient(ctx, regMessage.Source, m.listener.Addr().String(), m.password, true)
+		if err != nil {
+			logger.Error(ctx, err)
+		}
+	}()
+
 	for {
 		select {
 		case <-ctx.Done():
@@ -185,7 +231,7 @@ func (m *Manager) handleConnection(
 			return
 		}
 
-		if err := m.processMessage(ctx, regMessage.Source, message); err != nil {
+		if err := m.processMessage(ctx, regMessage.Source, message, onReceivedMessage); err != nil {
 			logger.Errorf(
 				ctx,
 				"unable to process the message %#+v from %s (%s): %w",
@@ -198,8 +244,9 @@ func (m *Manager) handleConnection(
 
 func (m *Manager) processMessage(
 	ctx context.Context,
-	source string,
+	source ProcessName,
 	message MessageToMain,
+	onReceivedMessage OnReceivedMessageFunc,
 ) (_ret error) {
 	logger.Tracef(ctx, "processing message from '%s': %#+v", source, message)
 	defer func() { logger.Tracef(ctx, "/processing message from '%s': %#+v: %v", source, message, _ret) }()
@@ -209,7 +256,7 @@ func (m *Manager) processMessage(
 		logger.Tracef(ctx, "a broadcast message from '%s': %#+v", source, message.Content)
 		var wg sync.WaitGroup
 		var err *multierror.Error
-		err = multierror.Append(err, m.onReceivedMessage(ctx, source, message.Content))
+		err = multierror.Append(err, onReceivedMessage(ctx, source, message.Content))
 
 		errCh := make(chan error)
 		go func() {
@@ -222,7 +269,7 @@ func (m *Manager) processMessage(
 				continue
 			}
 			wg.Add(1)
-			go func(dst string) {
+			go func(dst ProcessName) {
 				defer wg.Done()
 				errCh <- m.sendMessage(ctx, source, dst, message.Content)
 			}(dst)
@@ -232,37 +279,22 @@ func (m *Manager) processMessage(
 		return err.ErrorOrNil()
 	case "main":
 		logger.Tracef(ctx, "a message to the main process from '%s': %#+v", source, message.Content)
-		return m.onReceivedMessage(ctx, source, message.Content)
+		return onReceivedMessage(ctx, source, message.Content)
 	default:
 		logger.Tracef(ctx, "a message to '%s' from '%s': %#+v", message.Destination, source, message.Content)
 		return m.sendMessage(ctx, source, message.Destination, message.Content)
 	}
 }
 
-func (m *Manager) onReceivedMessage(
-	ctx context.Context,
-	source string,
-	content any,
-) error {
-	if m.OnReceivedMessage == nil {
-		err := fmt.Errorf("OnReceivedMessage is not set")
-		logger.Tracef(ctx, "%v", err)
-		return err
-	}
-
-	logger.Tracef(ctx, "calling the OnReceivedMessage function")
-	return m.OnReceivedMessage(ctx, source, content)
-}
-
 type MessageFromMain struct {
-	Source      string
+	Source      ProcessName
 	Password    string
-	Destination string
+	Destination ProcessName
 	Content     any
 }
 
 func (m *Manager) isExpectedProcess(
-	name string,
+	name ProcessName,
 ) bool {
 	for _, p := range m.allClientProcesses {
 		if name == p {
@@ -274,8 +306,8 @@ func (m *Manager) isExpectedProcess(
 
 func (m *Manager) sendMessage(
 	ctx context.Context,
-	source string,
+	source ProcessName,
-	destination string,
+	destination ProcessName,
 	content any,
 ) (_ret error) {
 	logger.Tracef(ctx, "sending message message %#+v from '%s' to '%s'", content, source, destination)
@@ -309,7 +341,7 @@ func (m *Manager) sendMessage(
 }
 
 func (m *Manager) waitForProcess(
-	name string,
+	name ProcessName,
 ) (net.Conn, error) {
 	if !m.isExpectedProcess(name) {
 		return nil, fmt.Errorf("process '%s' is not ever expected", name)
@@ -336,7 +368,7 @@ func (m *Manager) checkPassword(
 }
 
 func (m *Manager) registerConnection(
-	sourceName string,
+	sourceName ProcessName,
 	conn net.Conn,
 ) error {
 	if !m.isExpectedProcess(sourceName) {
@@ -356,7 +388,7 @@ func (m *Manager) registerConnection(
 }
 
 func (m *Manager) unregisterConnection(
-	sourceName string,
+	sourceName ProcessName,
 ) {
 	m.connsLocker.Lock()
 	defer m.connsLocker.Unlock()
@@ -368,7 +400,7 @@ func (m *Manager) unregisterConnection(
 
 type RegistrationMessage struct {
 	Password string
-	Source   string
+	Source   ProcessName
 }
 
 type RegistrationResult struct {
@@ -377,6 +409,30 @@ type RegistrationResult struct {
 
 type MessageToMain struct {
 	Password    string
-	Destination string
+	Destination ProcessName
 	Content     any
 }
+
+func (m *Manager) SendMessage(
+	ctx context.Context,
+	dst ProcessName,
+	content any,
+) error {
+	conn, err := m.waitForProcess(dst)
+	if err != nil {
+		return fmt.Errorf("unable to wait for process '%s': %w", dst, err)
+	}
+	encoder := gob.NewEncoder(conn)
+	msg := MessageFromMain{
+		Source:      "main",
+		Password:    m.password,
+		Destination: dst,
+		Content:     content,
+	}
+	err = encoder.Encode(msg)
+	logger.Tracef(ctx, "sending message %#+v: %v", msg, err)
+	if err != nil {
+		return fmt.Errorf("unable to encode&send message %#+v: %w", msg, err)
+	}
+	return nil
+}

pkg/mainprocess/types.go

@@ -0,0 +1,3 @@
+package mainprocess
+
+type ProcessName string

pkg/mainprocess/unit_test.go

@@ -50,35 +50,36 @@ func Test(t *testing.T) {
 	}
 
 	m, err := NewManager(
-		func(ctx context.Context, source string, content any) error {
+		nil,
-			handleCall("main", content)
-			return nil
-		},
 		"child0", "child1",
 	)
 	require.NoError(t, err)
 	defer m.Close()
-	go m.Serve(belt.WithField(ctx, "process", "main"))
+	go m.Serve(
+		belt.WithField(ctx, "process", "main"),
+		func(ctx context.Context, source ProcessName, content any) error {
+			handleCall("main", content)
+			return nil
+		},
+	)
 
-	c0, err := NewClient("child0", m.Addr().String(), m.Password(), func(ctx context.Context, source string, content any) error {
+	c0, err := NewClient("child0", m.Addr().String(), m.Password())
+	require.NoError(t, err)
+	defer c0.Close()
+	go c0.Serve(belt.WithField(ctx, "process", "child0"), func(ctx context.Context, source ProcessName, content any) error {
 		handleCall("child0", content)
 		return nil
 	})
-	require.NoError(t, err)
-	defer c0.Close()
-	go c0.Serve(belt.WithField(ctx, "process", "child0"))
 
-	c1, err := NewClient("child1", m.Addr().String(), m.Password(), func(ctx context.Context, source string, content any) error {
+	c1, err := NewClient("child1", m.Addr().String(), m.Password())
+	require.NoError(t, err)
+	defer c1.Close()
+	go c1.Serve(belt.WithField(ctx, "process", "child1"), func(ctx context.Context, source ProcessName, content any) error {
 		handleCall("child1", content)
 		return nil
 	})
-	require.NoError(t, err)
-	defer c1.Close()
-	go c1.Serve(belt.WithField(ctx, "process", "child1"))
 
-	_, err = NewClient("child2", m.Addr().String(), m.Password(), func(ctx context.Context, source string, content any) error {
+	_, err = NewClient("child2", m.Addr().String(), m.Password())
-		return nil
-	})
 	require.Error(t, err)
 
 	waitCh0 := handleCallHappened["main"]

pkg/streamd/config/config.go

@@ -19,13 +19,11 @@ type ProfileMetadata struct {
 	MaxOrder                 int
 }
 
-
 type config struct {
 	CachePath       *string `yaml:"cache_path"`
 	GitRepo         GitRepoConfig
 	Backends        streamcontrol.Config
 	ProfileMetadata map[streamcontrol.ProfileName]ProfileMetadata
-	SentryDSN       string              `yaml:"sentry_dsn"`
 	StreamServer    streamserver.Config `yaml:"stream_server"`
 }
 

pkg/streamd/config/git_repo_config.go

@@ -0,0 +1,8 @@
+package config
+
+type GitRepoConfig struct {
+	Enable           *bool
+	URL              string `yaml:"url,omitempty"`
+	PrivateKey       string `yaml:"private_key,omitempty"`
+	LatestSyncCommit string `yaml:"latest_sync_commit,omitempty"` // TODO: deprecate this field, it's just a non-needed mechanism (better to check against git history).
+}

pkg/streampanel/config/config.go

@@ -17,7 +17,6 @@ type ScreenshotConfig struct {
 }
 
 type Config struct {
-	SentryDSN         string           `yaml:"sentry_dsn"`
 	RemoteStreamDAddr string           `yaml:"streamd_remote"`
 	BuiltinStreamD    streamd.Config   `yaml:"streamd_builtin"`
 	Screenshot        ScreenshotConfig `yaml:"screenshot"`

pkg/streampanel/config/options.go

@@ -18,9 +18,3 @@ type OptionRemoteStreamDAddr string
 func (o OptionRemoteStreamDAddr) Apply(cfg *Config) {
 	cfg.RemoteStreamDAddr = string(o)
 }
-
-type OptionSentryDSN string
-
-func (o OptionSentryDSN) Apply(cfg *Config) {
-	cfg.SentryDSN = string(o)
-}

pkg/streampanel/fyne.go

@@ -0,0 +1,14 @@
+package streampanel
+
+import (
+	"time"
+
+	"fyne.io/fyne/v2"
+)
+
+func hideWindow(w fyne.Window) {
+	for i := 0; i < 10; i++ {
+		time.Sleep(time.Millisecond)
+		w.Hide()
+	}
+}

pkg/streampanel/options.go

@@ -6,4 +6,3 @@ type Config = config.Config
 type Option = config.Option
 type Options = config.Options
 type OptionRemoteStreamDAddr = config.OptionRemoteStreamDAddr
-type OptionSentryDSN = config.OptionSentryDSN

pkg/streampanel/panel.go

@@ -200,6 +200,23 @@ func (p *Panel) dumpConfig(ctx context.Context) {
 	logger.Tracef(ctx, "the current config is: %s", buf.String())
 }
 
+func (p *Panel) lazyInitStreamD(ctx context.Context) error {
+	if p.StreamD != nil {
+		return nil
+	}
+
+	if p.Config.RemoteStreamDAddr != "" {
+		if err := p.initRemoteStreamD(ctx); err != nil {
+			return fmt.Errorf("unable to initialize the remote stream controller '%s': %w", p.Config.RemoteStreamDAddr, err)
+		}
+	} else {
+		if err := p.initBuiltinStreamD(ctx); err != nil {
+			return fmt.Errorf("unable to initialize the builtin stream controller '%s': %w", p.configPath, err)
+		}
+	}
+	return nil
+}
+
 func (p *Panel) Loop(ctx context.Context, opts ...LoopOption) error {
 	if p.defaultContext != nil {
 		return fmt.Errorf("Loop was already used, and cannot be used the second time")
@@ -210,14 +227,8 @@ func (p *Panel) Loop(ctx context.Context, opts ...LoopOption) error {
 
 	p.defaultContext = ctx
 
-	if p.Config.RemoteStreamDAddr != "" {
+	if err := p.lazyInitStreamD(ctx); err != nil {
-		if err := p.initRemoteStreamD(ctx); err != nil {
+		return fmt.Errorf("unable to initialize stream controller: %w", err)
-			return fmt.Errorf("unable to initialize the remote stream controller '%s': %w", p.Config.RemoteStreamDAddr, err)
-		}
-	} else {
-		if err := p.initBuiltinStreamD(ctx); err != nil {
-			return fmt.Errorf("unable to initialize the builtin stream controller '%s': %w", p.configPath, err)
-		}
 	}
 
 	p.app = fyneapp.New()

pkg/streampanel/util.go

@@ -0,0 +1,7 @@
+package streampanel
+
+func assert(b bool) {
+	if !b {
+		panic("assertion failed")
+	}
+}

pkg/streamserver/server/traffic_counter.go

@@ -0,0 +1,77 @@
+package server
+
+import (
+	"fmt"
+	"math"
+	"sync"
+	"sync/atomic"
+	"unsafe"
+)
+
+type NumBytesWroter interface {
+	NumBytesWrote() uint64
+}
+
+type NumBytesReader interface {
+	NumBytesRead() uint64
+}
+
+type NumBytesReaderWroter interface {
+	NumBytesReader
+	NumBytesWroter
+}
+
+type Counter interface {
+	Count() uint64
+}
+
+type TrafficCounter struct {
+	sync.Mutex
+	ReaderCounter Counter
+	WriterCounter Counter
+}
+
+func (tc *TrafficCounter) NumBytesWrote() uint64 {
+	if tc == nil {
+		return math.MaxUint64
+	}
+
+	tc.Lock()
+	defer tc.Unlock()
+	if tc.WriterCounter == nil {
+		return math.MaxUint64
+	}
+	return tc.WriterCounter.Count()
+}
+
+func (tc *TrafficCounter) NumBytesRead() uint64 {
+	if tc == nil {
+		return math.MaxUint64
+	}
+
+	tc.Lock()
+	defer tc.Unlock()
+	if tc.ReaderCounter == nil {
+		return math.MaxUint64
+	}
+	fmt.Println(tc.ReaderCounter.Count())
+	return tc.ReaderCounter.Count()
+}
+
+type IntPtrCounter struct {
+	Pointer *int
+}
+
+func NewIntPtrCounter(v *int) *IntPtrCounter {
+	return &IntPtrCounter{
+		Pointer: v,
+	}
+}
+
+func (c *IntPtrCounter) Count() uint64 {
+	if c == nil || c.Pointer == nil {
+		return math.MaxUint64
+	}
+
+	return uint64(atomic.LoadInt32((*int32)(unsafe.Pointer(c.Pointer))))
+}

pkg/streamserver/util.go

@@ -0,0 +1,7 @@
+package streamserver
+
+func assert(b bool) {
+	if !b {
+		panic("assertion failed")
+	}
+}