Rewrite to WaitGroup.Go

events/multi_observer.go

@@ -12,14 +12,11 @@ type multiObserver struct {
 
 func (m multiObserver) EventStart(evt mtglib.EventStart) {
 	wg := &sync.WaitGroup{}
-	wg.Add(len(m.observers))
 
 	for _, v := range m.observers {
-		go func(obs Observer) {
-			defer wg.Done()
-
-			obs.EventStart(evt)
-		}(v)
+		wg.Go(func() {
+			v.EventStart(evt)
+		})
 	}
 
 	wg.Wait()
@@ -27,14 +24,11 @@ func (m multiObserver) EventStart(evt mtglib.EventStart) {
 
 func (m multiObserver) EventConnectedToDC(evt mtglib.EventConnectedToDC) {
 	wg := &sync.WaitGroup{}
-	wg.Add(len(m.observers))
 
 	for _, v := range m.observers {
-		go func(obs Observer) {
-			defer wg.Done()
-
-			obs.EventConnectedToDC(evt)
-		}(v)
+		wg.Go(func() {
+			v.EventConnectedToDC(evt)
+		})
 	}
 
 	wg.Wait()
@@ -42,14 +36,11 @@ func (m multiObserver) EventConnectedToDC(evt mtglib.EventConnectedToDC) {
 
 func (m multiObserver) EventDomainFronting(evt mtglib.EventDomainFronting) {
 	wg := &sync.WaitGroup{}
-	wg.Add(len(m.observers))
 
 	for _, v := range m.observers {
-		go func(obs Observer) {
-			defer wg.Done()
-
-			obs.EventDomainFronting(evt)
-		}(v)
+		wg.Go(func() {
+			v.EventDomainFronting(evt)
+		})
 	}
 
 	wg.Wait()
@@ -57,14 +48,11 @@ func (m multiObserver) EventDomainFronting(evt mtglib.EventDomainFronting) {
 
 func (m multiObserver) EventTraffic(evt mtglib.EventTraffic) {
 	wg := &sync.WaitGroup{}
-	wg.Add(len(m.observers))
 
 	for _, v := range m.observers {
-		go func(obs Observer) {
-			defer wg.Done()
-
-			obs.EventTraffic(evt)
-		}(v)
+		wg.Go(func() {
+			v.EventTraffic(evt)
+		})
 	}
 
 	wg.Wait()
@@ -72,14 +60,11 @@ func (m multiObserver) EventTraffic(evt mtglib.EventTraffic) {
 
 func (m multiObserver) EventFinish(evt mtglib.EventFinish) {
 	wg := &sync.WaitGroup{}
-	wg.Add(len(m.observers))
 
 	for _, v := range m.observers {
-		go func(obs Observer) {
-			defer wg.Done()
-
-			obs.EventFinish(evt)
-		}(v)
+		wg.Go(func() {
+			v.EventFinish(evt)
+		})
 	}
 
 	wg.Wait()
@@ -87,14 +72,11 @@ func (m multiObserver) EventFinish(evt mtglib.EventFinish) {
 
 func (m multiObserver) EventConcurrencyLimited(evt mtglib.EventConcurrencyLimited) {
 	wg := &sync.WaitGroup{}
-	wg.Add(len(m.observers))
 
 	for _, v := range m.observers {
-		go func(obs Observer) {
-			defer wg.Done()
-
-			obs.EventConcurrencyLimited(evt)
-		}(v)
+		wg.Go(func() {
+			v.EventConcurrencyLimited(evt)
+		})
 	}
 
 	wg.Wait()
@@ -102,14 +84,11 @@ func (m multiObserver) EventConcurrencyLimited(evt mtglib.EventConcurrencyLimite
 
 func (m multiObserver) EventIPBlocklisted(evt mtglib.EventIPBlocklisted) {
 	wg := &sync.WaitGroup{}
-	wg.Add(len(m.observers))
 
 	for _, v := range m.observers {
-		go func(obs Observer) {
-			defer wg.Done()
-
-			obs.EventIPBlocklisted(evt)
-		}(v)
+		wg.Go(func() {
+			v.EventIPBlocklisted(evt)
+		})
 	}
 
 	wg.Wait()
@@ -117,14 +96,11 @@ func (m multiObserver) EventIPBlocklisted(evt mtglib.EventIPBlocklisted) {
 
 func (m multiObserver) EventReplayAttack(evt mtglib.EventReplayAttack) {
 	wg := &sync.WaitGroup{}
-	wg.Add(len(m.observers))
 
 	for _, v := range m.observers {
-		go func(obs Observer) {
-			defer wg.Done()
-
-			obs.EventReplayAttack(evt)
-		}(v)
+		wg.Go(func() {
+			v.EventReplayAttack(evt)
+		})
 	}
 
 	wg.Wait()
@@ -132,14 +108,11 @@ func (m multiObserver) EventReplayAttack(evt mtglib.EventReplayAttack) {
 
 func (m multiObserver) EventIPListSize(evt mtglib.EventIPListSize) {
 	wg := &sync.WaitGroup{}
-	wg.Add(len(m.observers))
 
 	for _, v := range m.observers {
-		go func(obs Observer) {
-			defer wg.Done()
-
-			obs.EventIPListSize(evt)
-		}(v)
+		wg.Go(func() {
+			v.EventIPListSize(evt)
+		})
 	}
 
 	wg.Wait()

internal/cli/access.go

@@ -61,11 +61,8 @@ func (a *Access) Run(cli *CLI, version string) error {
 	}
 
 	wg := &sync.WaitGroup{}
-	wg.Add(2)
-
-	go func() {
-		defer wg.Done()
 
+	wg.Go(func() {
 		ip := a.PublicIPv4
 		if ip == nil {
 			ip = a.getIP(ntw, "tcp4")
@@ -76,11 +73,8 @@ func (a *Access) Run(cli *CLI, version string) error {
 		}
 
 		resp.IPv4 = a.makeURLs(conf, ip)
-	}()
-
-	go func() {
-		defer wg.Done()
-
+	})
+	wg.Go(func() {
 		ip := a.PublicIPv6
 		if ip == nil {
 			ip = a.getIP(ntw, "tcp6")
@@ -91,7 +85,7 @@ func (a *Access) Run(cli *CLI, version string) error {
 		}
 
 		resp.IPv6 = a.makeURLs(conf, ip)
-	}()
+	})
 
 	wg.Wait()
 

ipblocklist/firehol.go

@@ -112,18 +112,15 @@ func (f *Firehol) update() {
 	defer cancel()
 
 	wg := &sync.WaitGroup{}
-	wg.Add(len(f.blocklists))
 
 	mutex := &sync.Mutex{}
 	ranger := cidranger.NewPCTrieRanger()
 
 	for _, v := range f.blocklists {
-		go func(file files.File) {
-			defer wg.Done()
+		wg.Go(func() {
+			logger := f.logger.BindStr("filename", v.String())
 
-			logger := f.logger.BindStr("filename", file.String())
-
-			fileContent, err := file.Open(ctx)
+			fileContent, err := v.Open(ctx)
 			if err != nil {
 				logger.WarningError("update has failed", err)
 
@@ -135,7 +132,7 @@ func (f *Firehol) update() {
 			if err := f.updateFromFile(mutex, ranger, bufio.NewScanner(fileContent)); err != nil {
 				logger.WarningError("update has failed", err)
 			}
-		}(v)
+		})
 	}
 
 	wg.Wait()

network/circuit_breaker_internal_test.go

@@ -52,17 +52,9 @@ func (suite *CircuitBreakerTestSuite) TestMultipleRunsOk() {
 		Return(suite.connMock, nil)
 
 	wg := &sync.WaitGroup{}
-	wg.Add(5)
-
-	go func() {
-		wg.Wait()
-		suite.ctxCancel()
-	}()
 
 	for range 5 {
-		go func() {
-			defer wg.Done()
-
+		wg.Go(func() {
 			conn, err := suite.d.DialContext(suite.ctx, "tcp", "127.0.0.1")
 
 			suite.mutex.Lock()
@@ -70,9 +62,14 @@ func (suite *CircuitBreakerTestSuite) TestMultipleRunsOk() {
 
 			suite.NoError(err)
 			suite.Equal("127.0.0.1:3128", conn.RemoteAddr().String())
-		}()
+		})
 	}
 
+	go func() {
+		wg.Wait()
+		suite.ctxCancel()
+	}()
+
 	suite.Eventually(func() bool {
 		_, ok := <-suite.ctx.Done()
 

network/network.go

@@ -81,32 +81,24 @@ func (n *network) dnsResolve(protocol, address string) ([]string, error) {
 
 	switch protocol {
 	case "tcp", "tcp4":
-		wg.Add(1)
-
-		go func() {
-			defer wg.Done()
-
+		wg.Go(func() {
 			resolved := n.dns.LookupA(address)
 
 			mutex.Lock()
 			ips = append(ips, resolved...)
 			mutex.Unlock()
-		}()
+		})
 	}
 
 	switch protocol {
 	case "tcp", "tcp6":
-		wg.Add(1)
-
-		go func() {
-			defer wg.Done()
-
+		wg.Go(func() {
 			resolved := n.dns.LookupAAAA(address)
 
 			mutex.Lock()
 			ips = append(ips, resolved...)
 			mutex.Unlock()
-		}()
+		})
 	}
 
 	wg.Wait()