feat: add writeJSON function

v1/client/client.go

@@ -70,6 +70,7 @@ type SafeWebsocketClientBuilder struct {
 	path        *string
 	rawQuery    *string
 	useTLS      *bool
+	channelSize *int64
 }
 
 func NewSafeWebsocketClientBuilder() *SafeWebsocketClientBuilder {
@@ -101,7 +102,12 @@ func (b *SafeWebsocketClientBuilder) RawQuery(rawQuery string) *SafeWebsocketCli
 	return b
 }
 
-func (b *SafeWebsocketClientBuilder) Build() (*SafeWebsocketClient, error) {
+func (b *SafeWebsocketClientBuilder) ChannelSize(channelSize int64) *SafeWebsocketClientBuilder {
+	b.channelSize = &channelSize
+	return b
+}
+
+func (b *SafeWebsocketClientBuilder) Build(ctx context.Context) (*SafeWebsocketClient, error) {
 	if err := internal.NilChecker(b); err != nil {
 		return nil, err
 	}
@@ -111,19 +117,27 @@ func (b *SafeWebsocketClientBuilder) Build() (*SafeWebsocketClient, error) {
 		useTLS = *b.useTLS
 	}
 
+	if b.channelSize == nil {
+		channelSize := int64(1)
+		b.channelSize = &channelSize
+	}
+
 	wsClient := SafeWebsocketClient{
 		baseHost:    *b.baseHost,
 		basePort:    *b.basePort,
 		useTLS:      useTLS,
 		path:        b.path,
 		rawQuery:    b.rawQuery,
-		dataChannel: make(chan []byte, 1),
+		dataChannel: make(chan []byte, *b.channelSize),
 		mu:          custom_rwmutex.NewCustomRwMutex(),
+		ctx:         ctx,
 		reconnectCh: make(chan struct{}, 1),
 		isConnected: false,
 		doneMap:     NewSafeMap[string, chan struct{}](),
 	}
 
+	go wsClient.reconnectHandler()
+
 	if err := wsClient.connect(); err != nil {
 		return nil, fmt.Errorf("failed to establish initial connection: %v", err)
 	}
@@ -140,8 +154,8 @@ type SafeWebsocketClient struct {
 	dataChannel chan []byte
 	mu          *custom_rwmutex.CustomRwMutex
 	conn        *websocket.Conn
+	cancelFuncs []context.CancelFunc
 	ctx         context.Context
-	cancel      context.CancelFunc
 	reconnectCh chan struct{}
 	isConnected bool
 
@@ -174,7 +188,6 @@ func (wsClient *SafeWebsocketClient) connect() error {
 	}
 
 	conn.SetPingHandler(func(pingData string) error {
-		return wsClient.mu.WriteHandler(func() error {
 		if err := conn.WriteMessage(websocket.PongMessage, []byte(pingData)); err != nil {
 			if err == websocket.ErrCloseSent {
 				return nil
@@ -186,73 +199,84 @@ func (wsClient *SafeWebsocketClient) connect() error {
 		}
 		return nil
 	})
-	})
 
 	wsClient.mu.WriteHandler(func() error {
+		if wsClient.conn != nil {
 			wsClient.conn.Close()
-		ctx, cancel := context.WithCancel(context.Background())
+		}
-		wsClient.ctx = ctx
+
-		wsClient.cancel = cancel
 		wsClient.conn = conn
+
 		wsClient.isConnected = true
 
+		pingCtx, pingCancel := context.WithCancel(context.Background())
+		go wsClient.startPingTicker(pingCtx)
+		wsClient.cancelFuncs = append(wsClient.cancelFuncs, pingCancel)
+
+		receiverCtx, receiverCancel := context.WithCancel(context.Background())
+		go wsClient.startReceiveHandler(receiverCtx)
+		wsClient.cancelFuncs = append(wsClient.cancelFuncs, receiverCancel)
+
 		return nil
 	})
-
-	go wsClient.startPingTicker()
-	go wsClient.startReceiveHandler()
-	go wsClient.reconnectHandler()
-
 	return nil
 }
 
-func (wsClient *SafeWebsocketClient) startPingTicker() {
+func (wsClient *SafeWebsocketClient) startPingTicker(ctx context.Context) {
 	ticker := time.NewTicker(pingPeriod)
 	defer ticker.Stop()
 
-	doneKey := "startPingTicker"
-	wsClient.doneMap.Store(doneKey, make(chan struct{}))
-	done, _ := wsClient.doneMap.Load(doneKey)
 	for {
 		select {
+		case <-ctx.Done():
+			log.Println("ping ticker stopped")
+			return
 		case <-ticker.C:
 			wsClient.mu.WriteHandler(func() error {
+				if wsClient.conn == nil {
+					return fmt.Errorf("connection closed")
+				}
 				if err := wsClient.conn.WriteMessage(websocket.PingMessage, []byte{}); err != nil {
 					log.Printf("Ping failed: %v. Will attempt reconnect.", err)
 					wsClient.triggerReconnect()
 				}
 				return nil
 			})
-		case <-done:
-			log.Println("Ping ticker stopped")
-			return
 		}
 	}
 }
 
-func (wsClient *SafeWebsocketClient) startReceiveHandler() {
+func (wsClient *SafeWebsocketClient) startReceiveHandler(ctx context.Context) {
-	doneKey := "startReceiveHandler"
-	wsClient.doneMap.Store(doneKey, make(chan struct{}))
-	done, _ := wsClient.doneMap.Load(doneKey)
-
 	for {
 		select {
-		case <-done:
+		case <-ctx.Done():
-			log.Println("Reconnect handler stopped")
+			log.Println("receive handler stopped")
 			return
 		default:
+			if err := wsClient.mu.ReadHandler(func() error {
 				conn := wsClient.conn
 
 				if conn == nil {
 					wsClient.triggerReconnect()
-				return
+					return fmt.Errorf("connection closed")
 				}
 				_, message, err := conn.ReadMessage()
 				if err != nil {
 					wsClient.triggerReconnect()
+					return fmt.Errorf("failed to read message: %v", err)
+				}
+				select {
+				case wsClient.dataChannel <- message:
+				case <-ctx.Done():
+					log.Println("Reconnect handler stopped")
+					return nil
+				default:
+					log.Println("Data channel full, dropping message")
+				}
+				return nil
+			}); err != nil {
 				return
 			}
-			wsClient.dataChannel <- message
 		}
 	}
 }
@@ -265,20 +289,45 @@ func (wsClient *SafeWebsocketClient) triggerReconnect() {
 }
 
 func (wsClient *SafeWebsocketClient) reconnectHandler() {
-	doneKey := "reconnectHandler"
+	backoff := 1 * time.Second
-	wsClient.doneMap.Store(doneKey, make(chan struct{}))
+	maxBackoff := 30 * time.Second
-	done, _ := wsClient.doneMap.Load(doneKey)
 	for {
 		select {
 		case <-wsClient.reconnectCh:
-			wsClient.cancel()
+			log.Println("Reconnect triggered")
-			wsClient.connect()
+			if wsClient.cancelFuncs != nil {
+				for _, cancel := range wsClient.cancelFuncs {
+					cancel()
+				}
+			}
+			wsClient.isConnected = false
 
-			wsClient.doneMap.Range(func(s string, c chan struct{}) bool {
+			time.Sleep(100 * time.Millisecond)
-				c <- struct{}{}
+
-				return true
+			isInnerLoop := true
-			})
+			for isInnerLoop {
-		case <-done:
+				log.Printf("Attempting reconnect in %v...", backoff)
+				select {
+				case <-time.After(backoff):
+					if err := wsClient.connect(); err != nil {
+						log.Printf("Reconnect failed: %v", err)
+						if backoff < maxBackoff {
+							backoff *= 2
+						}
+						continue
+					}
+					log.Println("Reconnected successfully")
+					backoff = 1 * time.Second
+					isInnerLoop = false
+					continue
+				case <-wsClient.ctx.Done():
+					return
+				}
+			}
+
+		case <-wsClient.ctx.Done():
+			log.Println("reconnect handler stopped due to client shutdown")
+			wsClient.Close()
 			return
 		}
 	}
@@ -287,3 +336,27 @@ func (wsClient *SafeWebsocketClient) reconnectHandler() {
 func (wsClient *SafeWebsocketClient) DataChannel() <-chan []byte {
 	return wsClient.dataChannel
 }
+
+func (wsClient *SafeWebsocketClient) WriteJSON(message any) error {
+	return wsClient.mu.WriteHandler(func() error {
+		return wsClient.conn.WriteJSON(message)
+	})
+}
+
+func (wsClient *SafeWebsocketClient) Close() error {
+	wsClient.mu.WriteHandler(func() error {
+		if wsClient.cancelFuncs != nil {
+			for _, cancel := range wsClient.cancelFuncs {
+				cancel()
+			}
+		}
+		if wsClient.conn != nil {
+			wsClient.conn.Close()
+		}
+		wsClient.isConnected = false
+		return nil
+	})
+	close(wsClient.dataChannel)
+
+	return nil
+}

v1/examples/client/main.go

@@ -1,22 +1,39 @@
 package main
 
 import (
+	"context"
 	"fmt"
 	"log"
+	"os"
+	"os/signal"
+	"syscall"
 
 	"git.neurocipta.com/rogerferdinan/safe-web-socket/v1/client"
 )
 
 func main() {
+	sigChan := make(chan os.Signal, 1)
+	signal.Notify(sigChan, syscall.SIGINT, syscall.SIGTERM)
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	go func() {
+		<-sigChan
+		fmt.Println("\nReceived interrupt signal. Shutting down gracefully...")
+		cancel()
+	}()
+
 	wsClient, err := client.NewSafeWebsocketClientBuilder().
 		BaseHost("localhost").
 		BasePort(8080).
 		Path("/ws/test/data_1").
 		UseTLS(false).
-		Build()
+		Build(ctx)
 	if err != nil {
 		log.Fatal(err)
 	}
+
 	dataChannel := wsClient.DataChannel()
 
 	for data := range dataChannel {