fix: frpc reconnect frps frequently lead to memory leak (#1722)

client/control.go

@@ -183,6 +183,7 @@ func (ctl *Control) HandleNewProxyResp(inMsg *msg.NewProxyResp) {
 func (ctl *Control) Close() error {
 	ctl.pm.Close()
 	ctl.conn.Close()
+	ctl.vm.Close()
 	if ctl.session != nil {
 		ctl.session.Close()
 	}

client/service.go

@@ -142,12 +142,34 @@ func (svr *Service) keepControllerWorking() {
 	maxDelayTime := 20 * time.Second
 	delayTime := time.Second
 
+	// if frpc reconnect frps, we need to limit retry times in 1min
+	// current retry logic is sleep 0s, 0s, 0s, 1s, 2s, 4s, 8s, ...
+	// when exceed 1min, we will reset delay and counts
+	cutoffTime := time.Now().Add(time.Minute)
+	reconnectDelay := time.Second
+	reconnectCounts := 1
+
 	for {
 		<-svr.ctl.ClosedDoneCh()
 		if atomic.LoadUint32(&svr.exit) != 0 {
 			return
 		}
 
+		// the first three retry with no delay
+		if reconnectCounts > 3 {
+			time.Sleep(reconnectDelay)
+			reconnectDelay *= 2
+		}
+		reconnectCounts++
+
+		now := time.Now()
+		if now.After(cutoffTime) {
+			// reset
+			cutoffTime = now.Add(time.Minute)
+			reconnectDelay = time.Second
+			reconnectCounts = 1
+		}
+
 		for {
 			xl.Info("try to reconnect to server...")
 			conn, session, err := svr.login()
@@ -166,6 +188,9 @@ func (svr *Service) keepControllerWorking() {
 			ctl := NewControl(svr.ctx, svr.runId, conn, session, svr.cfg, svr.pxyCfgs, svr.visitorCfgs, svr.serverUDPPort, svr.authSetter)
 			ctl.Run()
 			svr.ctlMu.Lock()
+			if svr.ctl != nil {
+				svr.ctl.Close()
+			}
 			svr.ctl = ctl
 			svr.ctlMu.Unlock()
 			break

client/visitor_manager.go

@@ -33,6 +33,8 @@ type VisitorManager struct {
 
 	mu  sync.Mutex
 	ctx context.Context
+
+	stopCh chan struct{}
 }
 
 func NewVisitorManager(ctx context.Context, ctl *Control) *VisitorManager {
@@ -42,22 +44,32 @@ func NewVisitorManager(ctx context.Context, ctl *Control) *VisitorManager {
 		visitors:      make(map[string]Visitor),
 		checkInterval: 10 * time.Second,
 		ctx:           ctx,
+		stopCh:        make(chan struct{}),
 	}
 }
 
 func (vm *VisitorManager) Run() {
 	xl := xlog.FromContextSafe(vm.ctx)
+
+	ticker := time.NewTicker(vm.checkInterval)
+	defer ticker.Stop()
+
 	for {
-		time.Sleep(vm.checkInterval)
-		vm.mu.Lock()
-		for _, cfg := range vm.cfgs {
-			name := cfg.GetBaseInfo().ProxyName
-			if _, exist := vm.visitors[name]; !exist {
-				xl.Info("try to start visitor [%s]", name)
-				vm.startVisitor(cfg)
+		select {
+		case <-vm.stopCh:
+			xl.Info("gracefully shutdown visitor manager")
+			return
+		case <-ticker.C:
+			vm.mu.Lock()
+			for _, cfg := range vm.cfgs {
+				name := cfg.GetBaseInfo().ProxyName
+				if _, exist := vm.visitors[name]; !exist {
+					xl.Info("try to start visitor [%s]", name)
+					vm.startVisitor(cfg)
+				}
 			}
+			vm.mu.Unlock()
 		}
-		vm.mu.Unlock()
 	}
 }
 
@@ -126,4 +138,9 @@ func (vm *VisitorManager) Close() {
 	for _, v := range vm.visitors {
 		v.Close()
 	}
+	select {
+	case <-vm.stopCh:
+	default:
+		close(vm.stopCh)
+	}
 }

go.sum

@@ -3,6 +3,7 @@ github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuy
 github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
+github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5 h1:0CwZNZbxp69SHPdPJAN/hZIm0C4OItdklCFmMRWYpio=
 github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5/go.mod h1:wHh0iHkYZB8zMSxRWpUBQtwG5a7fFgvEO+odwuTv2gs=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
@@ -15,6 +16,7 @@ github.com/coreos/go-oidc v2.2.1+incompatible/go.mod h1:CgnwVTmzoESiwO9qyAFEMiHo
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/fatedier/beego v0.0.0-20171024143340-6c6a4f5bd5eb h1:wCrNShQidLmvVWn/0PikGmpdP0vtQmnvyRg3ZBEhczw=
 github.com/fatedier/beego v0.0.0-20171024143340-6c6a4f5bd5eb/go.mod h1:wx3gB6dbIfBRcucp94PI9Bt3I0F2c/MyNEWuhzpWiwk=
 github.com/fatedier/golib v0.0.0-20181107124048-ff8cd814b049 h1:teH578mf2ii42NHhIp3PhgvjU5bv+NFMq9fSQR8NaG8=
 github.com/fatedier/golib v0.0.0-20181107124048-ff8cd814b049/go.mod h1:DqIrnl0rp3Zybg9zbJmozTy1n8fYJoX+QoAj9slIkKM=
@@ -30,6 +32,7 @@ github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5y
 github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.3.2 h1:6nsPYzhq5kReh6QImI3k5qWzO4PEbvbIW2cwSfR/6xs=
 github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/golang/snappy v0.0.0-20170215233205-553a64147049 h1:K9KHZbXKpGydfDN0aZrsoHpLJlZsBrGMFWbgLDGnPZk=
 github.com/golang/snappy v0.0.0-20170215233205-553a64147049/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
 github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
@@ -66,6 +69,7 @@ github.com/pires/go-proxyproto v0.0.0-20190111085350-4d51b51e3bfc/go.mod h1:6/gX
 github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/pquerna/cachecontrol v0.0.0-20180517163645-1555304b9b35 h1:J9b7z+QKAmPf4YLrFg6oQUotqHQeUNWwkvo7jZp1GLU=
 github.com/pquerna/cachecontrol v0.0.0-20180517163645-1555304b9b35/go.mod h1:prYjPmNq4d1NPVmpShWobRqXY3q7Vp+80DqgxxUrUIA=
@@ -84,11 +88,15 @@ github.com/prometheus/procfs v0.0.0-20181005140218-185b4288413d/go.mod h1:c3At6R
 github.com/prometheus/procfs v0.0.2/go.mod h1:TjEm7ze935MbeOT/UhFTIMYKhuLP4wbCsTZCD3I8kEA=
 github.com/prometheus/procfs v0.0.8 h1:+fpWZdT24pJBiqJdAwYBjPSk+5YmQzYNPYzQsdzLkt8=
 github.com/prometheus/procfs v0.0.8/go.mod h1:7Qr8sr6344vo1JqZ6HhLceV9o3AJ1Ff+GxbHq6oeK9A=
+github.com/rakyll/statik v0.1.1 h1:fCLHsIMajHqD5RKigbFXpvX3dN7c80Pm12+NCrI3kvg=
 github.com/rakyll/statik v0.1.1/go.mod h1:OEi9wJV/fMUAGx1eNjq75DKDsJVuEv1U0oYdX6GX8Zs=
+github.com/rodaine/table v1.0.0 h1:UaCJG5Axc/cNXVGXqnCrffm1KxP0OfYLe1HuJLf5sFY=
 github.com/rodaine/table v1.0.0/go.mod h1:YAUzwPOji0DUJNEvggdxyQcUAl4g3hDRcFlyjnnR51I=
 github.com/sirupsen/logrus v1.2.0/go.mod h1:LxeOpSwHxABJmUn/MG1IvRgCAasNZTLOkJPxbbu5VWo=
 github.com/sirupsen/logrus v1.4.2/go.mod h1:tLMulIdttU9McNUspp0xgXVQah82FyeX6MwdIuYE2rE=
+github.com/spf13/cobra v0.0.3 h1:ZlrZ4XsMRm04Fr5pSFxBgfND2EBVa1nLpiy1stUsX/8=
 github.com/spf13/cobra v0.0.3/go.mod h1:1l0Ry5zgKvJasoi3XT1TypsSe7PqH0Sj9dhYf7v3XqQ=
+github.com/spf13/pflag v1.0.1 h1:aCvUg6QPl3ibpQUxyLkrEkCHtPqYJL4x9AuhqVqFis4=
 github.com/spf13/pflag v1.0.1/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
@@ -96,9 +104,13 @@ github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXf
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
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 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
+github.com/templexxx/cpufeat v0.0.0-20170927014610-3794dfbfb047 h1:K+jtWCOuZgCra7eXZ/VWn2FbJmrA/D058mTXhh2rq+8=
 github.com/templexxx/cpufeat v0.0.0-20170927014610-3794dfbfb047/go.mod h1:wM7WEvslTq+iOEAMDLSzhVuOt5BRZ05WirO+b09GHQU=
+github.com/templexxx/xor v0.0.0-20170926022130-0af8e873c554 h1:pexgSe+JCFuxG+uoMZLO+ce8KHtdHGhst4cs6rw3gmk=
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+github.com/tjfoc/gmsm v0.0.0-20171124023159-98aa888b79d8 h1:6CNSDqI1wiE+JqyOy5Qt/yo/DoNI2/QmmOZeiCid2Nw=
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+github.com/vaughan0/go-ini v0.0.0-20130923145212-a98ad7ee00ec h1:DGmKwyZwEB8dI7tbLt/I/gQuP559o/0FrAkHKlQM/Ks=
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