fix: client app retry logic (#144)

* fix: retry logic

client/cmd/service_controller.go

@@ -1,7 +1,6 @@
 package cmd
 
 import (
-	"github.com/cenkalti/backoff/v4"
 	"github.com/kardianos/service"
 	log "github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
@@ -11,31 +10,12 @@ import (
 
 func (p *program) Start(s service.Service) error {
 
-	var backOff = &backoff.ExponentialBackOff{
-		InitialInterval:     time.Second,
-		RandomizationFactor: backoff.DefaultRandomizationFactor,
-		Multiplier:          backoff.DefaultMultiplier,
-		MaxInterval:         30 * time.Second,
-		MaxElapsedTime:      24 * 3 * time.Hour, //stop after 3 days trying
-		Stop:                backoff.Stop,
-		Clock:               backoff.SystemClock,
-	}
-
 	// Start should not block. Do the actual work async.
 	log.Info("starting service") //nolint
 	go func() {
-		operation := func() error {
+		err := runClient()
-			err := runClient()
-			if err != nil {
-				log.Warnf("retrying Wiretrustee client app due to error: %v", err)
-				return err
-			}
-			return nil
-		}
-
-		err := backoff.Retry(operation, backOff)
 		if err != nil {
-			log.Errorf("exiting client retry loop due to unrecoverable error: %s", err)
+			log.Errorf("stopped Wiretrustee client app due to error: %v", err)
 			return
 		}
 	}()

client/cmd/up.go

@@ -2,6 +2,7 @@ package cmd
 
 import (
 	"context"
+	"github.com/cenkalti/backoff/v4"
 	"github.com/kardianos/service"
 	log "github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
@@ -12,6 +13,7 @@ import (
 	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
+	"time"
 )
 
 var (
@@ -117,86 +119,107 @@ func connectToManagement(ctx context.Context, managementAddr string, ourPrivateK
 }
 
 func runClient() error {
-	config, err := internal.ReadConfig(managementURL, configPath)
+	var backOff = &backoff.ExponentialBackOff{
+		InitialInterval:     time.Second,
+		RandomizationFactor: backoff.DefaultRandomizationFactor,
+		Multiplier:          backoff.DefaultMultiplier,
+		MaxInterval:         time.Hour,
+		MaxElapsedTime:      24 * 3 * time.Hour,
+		Stop:                backoff.Stop,
+		Clock:               backoff.SystemClock,
+	}
+
+	operation := func() error {
+
+		config, err := internal.ReadConfig(managementURL, configPath)
+		if err != nil {
+			log.Errorf("failed reading config %s %v", configPath, err)
+			return err
+		}
+
+		//validate our peer's Wireguard PRIVATE key
+		myPrivateKey, err := wgtypes.ParseKey(config.PrivateKey)
+		if err != nil {
+			log.Errorf("failed parsing Wireguard key %s: [%s]", config.PrivateKey, err.Error())
+			return err
+		}
+		ctx, cancel := context.WithCancel(context.Background())
+		defer cancel()
+
+		mgmTlsEnabled := false
+		if config.ManagementURL.Scheme == "https" {
+			mgmTlsEnabled = true
+		}
+
+		// connect (just a connection, no stream yet) and login to Management Service to get an initial global Wiretrustee config
+		mgmClient, loginResp, err := connectToManagement(ctx, config.ManagementURL.Host, myPrivateKey, mgmTlsEnabled)
+		if err != nil {
+			log.Warn(err)
+			return err
+		}
+
+		// with the global Wiretrustee config in hand connect (just a connection, no stream yet) Signal
+		signalClient, err := connectToSignal(ctx, loginResp.GetWiretrusteeConfig(), myPrivateKey)
+		if err != nil {
+			log.Error(err)
+			return err
+		}
+
+		peerConfig := loginResp.GetPeerConfig()
+
+		engineConfig, err := createEngineConfig(myPrivateKey, config, peerConfig)
+		if err != nil {
+			log.Error(err)
+			return err
+		}
+
+		// create start the Wiretrustee Engine that will connect to the Signal and Management streams and manage connections to remote peers.
+		engine := internal.NewEngine(signalClient, mgmClient, engineConfig, cancel, ctx)
+		err = engine.Start()
+		if err != nil {
+			log.Errorf("error while starting Wiretrustee Connection Engine: %s", err)
+			return err
+		}
+
+		log.Print("Wiretrustee engine started, my IP is: ", peerConfig.Address)
+
+		select {
+		case <-stopCh:
+		case <-ctx.Done():
+		}
+
+		backOff.Reset()
+
+		err = mgmClient.Close()
+		if err != nil {
+			log.Errorf("failed closing Management Service client %v", err)
+			return err
+		}
+		err = signalClient.Close()
+		if err != nil {
+			log.Errorf("failed closing Signal Service client %v", err)
+			return err
+		}
+
+		err = engine.Stop()
+		if err != nil {
+			log.Errorf("failed stopping engine %v", err)
+			return err
+		}
+
+		go func() {
+			cleanupCh <- struct{}{}
+		}()
+
+		log.Info("stopped Wiretrustee client")
+
+		return ctx.Err()
+	}
+
+	err := backoff.Retry(operation, backOff)
 	if err != nil {
-		log.Errorf("failed reading config %s %v", configPath, err)
+		log.Errorf("exiting client retry loop due to unrecoverable error: %s", err)
 		return err
 	}
-
+	return nil
-	//validate our peer's Wireguard PRIVATE key
-	myPrivateKey, err := wgtypes.ParseKey(config.PrivateKey)
-	if err != nil {
-		log.Errorf("failed parsing Wireguard key %s: [%s]", config.PrivateKey, err.Error())
-		return err
-	}
-	ctx, cancel := context.WithCancel(context.Background())
-	defer cancel()
-
-	mgmTlsEnabled := false
-	if config.ManagementURL.Scheme == "https" {
-		mgmTlsEnabled = true
-	}
-
-	// connect (just a connection, no stream yet) and login to Management Service to get an initial global Wiretrustee config
-	mgmClient, loginResp, err := connectToManagement(ctx, config.ManagementURL.Host, myPrivateKey, mgmTlsEnabled)
-	if err != nil {
-		log.Warn(err)
-		return err
-	}
-
-	// with the global Wiretrustee config in hand connect (just a connection, no stream yet) Signal
-	signalClient, err := connectToSignal(ctx, loginResp.GetWiretrusteeConfig(), myPrivateKey)
-	if err != nil {
-		log.Error(err)
-		return err
-	}
-
-	peerConfig := loginResp.GetPeerConfig()
-
-	engineConfig, err := createEngineConfig(myPrivateKey, config, peerConfig)
-	if err != nil {
-		log.Error(err)
-		return err
-	}
-
-	// create start the Wiretrustee Engine that will connect to the Signal and Management streams and manage connections to remote peers.
-	engine := internal.NewEngine(signalClient, mgmClient, engineConfig, cancel, ctx)
-	err = engine.Start()
-	if err != nil {
-		log.Errorf("error while starting Wiretrustee Connection Engine: %s", err)
-		return err
-	}
-
-	log.Print("Wiretrustee engine started, my IP is: ", peerConfig.Address)
-
-	select {
-	case <-stopCh:
-	case <-ctx.Done():
-	}
-
-	err = mgmClient.Close()
-	if err != nil {
-		log.Errorf("failed closing Management Service client %v", err)
-		return err
-	}
-	err = signalClient.Close()
-	if err != nil {
-		log.Errorf("failed closing Signal Service client %v", err)
-		return err
-	}
-
-	err = engine.Stop()
-	if err != nil {
-		log.Errorf("failed stopping engine %v", err)
-		return err
-	}
-
-	go func() {
-		cleanupCh <- struct{}{}
-	}()
-
-	log.Info("stopped Wiretrustee client")
-
-	return ctx.Err()
-
 }

management/client/client.go

@@ -70,8 +70,8 @@ func defaultBackoff(ctx context.Context) backoff.BackOff {
 		InitialInterval:     800 * time.Millisecond,
 		RandomizationFactor: backoff.DefaultRandomizationFactor,
 		Multiplier:          backoff.DefaultMultiplier,
-		MaxInterval:         30 * time.Second,
+		MaxInterval:         15 * time.Minute,
-		MaxElapsedTime:      24 * 3 * time.Hour, //stop after 3 days trying
+		MaxElapsedTime:      time.Hour, //stop after an hour of trying, the error will be propagated to the general retry of the client
 		Stop:                backoff.Stop,
 		Clock:               backoff.SystemClock,
 	}, ctx)
@@ -103,12 +103,10 @@ func (c *Client) Sync(msgHandler func(msg *proto.SyncResponse) error) error {
 		// blocking until error
 		err = c.receiveEvents(stream, *serverPubKey, msgHandler)
 		if err != nil {
-			/*if errStatus, ok := status.FromError(err); ok && errStatus.Code() == codes.PermissionDenied {
+			backOff.Reset()
-				//todo handle differently??
-			}*/
 			return err
 		}
-		backOff.Reset()
+
 		return nil
 	}
 

signal/client/client.go

@@ -81,8 +81,8 @@ func defaultBackoff(ctx context.Context) backoff.BackOff {
 		InitialInterval:     800 * time.Millisecond,
 		RandomizationFactor: backoff.DefaultRandomizationFactor,
 		Multiplier:          backoff.DefaultMultiplier,
-		MaxInterval:         30 * time.Second,
+		MaxInterval:         15 * time.Minute,
-		MaxElapsedTime:      24 * 3 * time.Hour, //stop after 3 days trying
+		MaxElapsedTime:      time.Hour, //stop after an hour of trying, the error will be propagated to the general retry of the client
 		Stop:                backoff.Stop,
 		Clock:               backoff.SystemClock,
 	}, ctx)
@@ -101,14 +101,19 @@ func (c *Client) Receive(msgHandler func(msg *proto.Message) error) {
 
 		operation := func() error {
 
-			err := c.connect(c.key.PublicKey().String(), msgHandler)
+			stream, err := c.connect(c.key.PublicKey().String())
 			if err != nil {
 				log.Warnf("disconnected from the Signal Exchange due to an error: %v", err)
 				c.connWg.Add(1)
 				return err
 			}
 
-			backOff.Reset()
+			err = c.receive(stream, msgHandler)
+			if err != nil {
+				backOff.Reset()
+				return err
+			}
+
 			return nil
 		}
 
@@ -120,7 +125,7 @@ func (c *Client) Receive(msgHandler func(msg *proto.Message) error) {
 	}()
 }
 
-func (c *Client) connect(key string, msgHandler func(msg *proto.Message) error) error {
+func (c *Client) connect(key string) (proto.SignalExchange_ConnectStreamClient, error) {
 	c.stream = nil
 
 	// add key fingerprint to the request header to be identified on the server side
@@ -131,23 +136,23 @@ func (c *Client) connect(key string, msgHandler func(msg *proto.Message) error)
 
 	c.stream = stream
 	if err != nil {
-		return err
+		return nil, err
 	}
 	// blocks
 	header, err := c.stream.Header()
 	if err != nil {
-		return err
+		return nil, err
 	}
 	registered := header.Get(proto.HeaderRegistered)
 	if len(registered) == 0 {
-		return fmt.Errorf("didn't receive a registration header from the Signal server whille connecting to the streams")
+		return nil, fmt.Errorf("didn't receive a registration header from the Signal server whille connecting to the streams")
 	}
 	//connection established we are good to use the stream
 	c.connWg.Done()
 
 	log.Infof("connected to the Signal Exchange Stream")
 
-	return c.receive(stream, msgHandler)
+	return stream, nil
 }
 
 // WaitConnected waits until the client is connected to the message stream