websocket: from 1k to 100k on a simple raspeberry pi 3 model b by using a bit lower level of the new ws lib api and restore the previous sync.Map for server's live connections, relative: https://github.com/kataras/iris/issues/1178

Former-commit-id: 40da148afb66a42d47285efce324269d66ed3b0e

_examples/websocket/go-client-stress-test/client/main.go

@@ -6,6 +6,7 @@ import (
 	"math/rand"
 	"os"
 	"sync"
+	"sync/atomic"
 	"time"
 
 	"github.com/kataras/iris/websocket2"
@@ -16,7 +17,28 @@ var (
 	f   *os.File
 )
 
-const totalClients = 1200
+const totalClients = 100000
+
+var connectionFailures uint64
+
+var (
+	disconnectErrors []error
+	connectErrors    []error
+	errMu            sync.Mutex
+)
+
+func collectError(op string, err error) {
+	errMu.Lock()
+	defer errMu.Unlock()
+
+	switch op {
+	case "disconnect":
+		disconnectErrors = append(disconnectErrors, err)
+	case "connect":
+		connectErrors = append(connectErrors, err)
+	}
+
+}
 
 func main() {
 	var err error
@@ -26,29 +48,93 @@ func main() {
 	}
 	defer f.Close()
 
+	start := time.Now()
+
 	wg := new(sync.WaitGroup)
-	for i := 0; i < totalClients/2; i++ {
+	for i := 0; i < totalClients/4; i++ {
 		wg.Add(1)
 		go connect(wg, 5*time.Second)
 	}
 
-	for i := 0; i < totalClients/2; i++ {
+	for i := 0; i < totalClients/4; i++ {
+		wg.Add(1)
+		waitTime := time.Duration(rand.Intn(5)) * time.Millisecond
+		time.Sleep(waitTime)
+		go connect(wg, 7*time.Second+waitTime)
+	}
+
+	for i := 0; i < totalClients/4; i++ {
 		wg.Add(1)
 		waitTime := time.Duration(rand.Intn(10)) * time.Millisecond
 		time.Sleep(waitTime)
 		go connect(wg, 10*time.Second+waitTime)
 	}
 
+	for i := 0; i < totalClients/4; i++ {
+		wg.Add(1)
+		waitTime := time.Duration(rand.Intn(20)) * time.Millisecond
+		time.Sleep(waitTime)
+		go connect(wg, 25*time.Second+waitTime)
+	}
+
 	wg.Wait()
-	fmt.Println("ALL OK.")
-	time.Sleep(5 * time.Second)
+	fmt.Println("--------================--------------")
+	fmt.Printf("execution time [%s]", time.Since(start))
+	fmt.Println()
+
+	if connectionFailures > 0 {
+		fmt.Printf("Finished with %d/%d connection failures. Please close the server-side manually.\n", connectionFailures, totalClients)
+	}
+
+	if n := len(connectErrors); n > 0 {
+		fmt.Printf("Finished with %d connect errors:\n", n)
+		var lastErr error
+		var sameC int
+
+		for i, err := range connectErrors {
+			if lastErr != nil {
+				if lastErr.Error() == err.Error() {
+					sameC++
+					continue
+				}
+			}
+
+			if sameC > 0 {
+				fmt.Printf("and %d more like this...\n", sameC)
+				sameC = 0
+				continue
+			}
+
+			fmt.Printf("[%d] - %v\n", i+1, err)
+			lastErr = err
+		}
+	}
+
+	if n := len(disconnectErrors); n > 0 {
+		fmt.Printf("Finished with %d disconnect errors\n", n)
+		for i, err := range disconnectErrors {
+			if err == websocket.ErrAlreadyDisconnected {
+				continue
+			}
+
+			fmt.Printf("[%d] - %v\n", i+1, err)
+		}
+	}
+
+	if connectionFailures == 0 && len(connectErrors) == 0 && len(disconnectErrors) == 0 {
+		fmt.Println("ALL OK.")
+	}
+
+	fmt.Println("--------================--------------")
 }
 
 func connect(wg *sync.WaitGroup, alive time.Duration) {
-
 	c, err := websocket.Dial(nil, url, websocket.ConnectionConfig{})
 	if err != nil {
-		panic(err)
+		atomic.AddUint64(&connectionFailures, 1)
+		collectError("connect", err)
+		wg.Done()
+		return
 	}
 
 	c.OnError(func(err error) {
@@ -68,7 +154,7 @@ func connect(wg *sync.WaitGroup, alive time.Duration) {
 	go func() {
 		time.Sleep(alive)
 		if err := c.Disconnect(); err != nil {
-			panic(err)
+			collectError("disconnect", err)
 		}
 
 		wg.Done()
@@ -80,6 +166,8 @@ func connect(wg *sync.WaitGroup, alive time.Duration) {
 			break
 		}
 
-		c.Emit("chat", scanner.Text())
+		if text := scanner.Text(); len(text) > 1 {
+			c.Emit("chat", text)
+		}
 	}
 }