implemented ping-pong heartbeats. adjusted logs and defaults.

honeybeetest/mocks.go

@@ -27,11 +27,13 @@ func (m *MockDialer) DialContext(
 
 type MockSocket struct {
 	WriteMessageFunc     func(int, []byte) error
+	WriteControlFunc     func(int, []byte, time.Time) error
 	SetReadDeadlineFunc  func(t time.Time) error
 	SetWriteDeadlineFunc func(t time.Time) error
 	ReadMessageFunc      func() (int, []byte, error)
 	CloseFunc            func() error
 	SetCloseHandlerFunc  func(func(int, string) error)
+	SetPongHandlerFunc   func(func(string) error)
 	Closed               chan struct{}
 	Once                 sync.Once
 	Mu                   sync.Mutex
@@ -40,12 +42,14 @@ type MockSocket struct {
 func NewMockSocket() *MockSocket {
 	return &MockSocket{
 		WriteMessageFunc: func(int, []byte) error { return nil },
+		WriteControlFunc: func(int, []byte, time.Time) error { return nil },
 		ReadMessageFunc:  func() (int, []byte, error) { return 0, []byte("message"), nil },
 		CloseFunc:        func() error { return nil },
 
 		SetReadDeadlineFunc:  func(time.Time) error { return nil },
 		SetWriteDeadlineFunc: func(time.Time) error { return nil },
 		SetCloseHandlerFunc:  func(func(int, string) error) {},
+		SetPongHandlerFunc:   func(func(string) error) {},
 
 		Closed: make(chan struct{}),
 	}
@@ -56,6 +60,10 @@ func (m *MockSocket) WriteMessage(t int, d []byte) error {
 	return m.WriteMessageFunc(t, d)
 }
 
+func (m *MockSocket) WriteControl(t int, d []byte, dl time.Time) error {
+	return m.WriteControlFunc(t, d, dl)
+}
+
 func (m *MockSocket) ReadMessage() (int, []byte, error) {
 	return m.ReadMessageFunc()
 }
@@ -76,6 +84,10 @@ func (m *MockSocket) SetCloseHandler(h func(code int, text string) error) {
 	m.SetCloseHandlerFunc(h)
 }
 
+func (m *MockSocket) SetPongHandler(h func(s string) error) {
+	m.SetPongHandlerFunc(h)
+}
+
 // Logging mocks
 
 type MockSlogHandler struct {

inbound/worker.go

@@ -70,13 +70,18 @@ func (w *DefaultWorker) Start(pool PoolPlugin) {
 	toForwarder := make(chan types.ReceivedMessage, 256)
 
 	var wg sync.WaitGroup
-	wg.Add(4)
+	wg.Add(5)
 
 	go func() {
 		defer wg.Done()
 		RunReader(w.ctx, pool.OnExit, w.conn, toQueue, w.heartbeat, w.logger)
 	}()
 
+	go func() {
+		defer wg.Done()
+		RunHeartbeatForwarder(w.ctx, w.conn, w.heartbeat, w.logger)
+	}()
+
 	go func() {
 		defer wg.Done()
 		queue.RunQueue(w.id, w.ctx, toQueue, toForwarder, w.config.MaxQueueSize)
@@ -177,6 +182,29 @@ func RunReader(
 	}
 }
 
+func RunHeartbeatForwarder(
+	ctx context.Context,
+	conn *transport.Connection,
+	heartbeat chan<- struct{},
+	logger *slog.Logger,
+) {
+	for {
+		select {
+		case <-ctx.Done():
+			return
+		case <-conn.Heartbeat():
+			select {
+			case heartbeat <- struct{}{}:
+				if logger != nil {
+					logger.Debug("ping-pong heartbeat")
+				}
+			case <-ctx.Done():
+				return
+			}
+		}
+	}
+}
+
 func RunForwarder(
 	id string,
 	ctx context.Context,

inbound/worker_test.go

@@ -229,3 +229,36 @@ func TestWorkerSend(t *testing.T) {
 		assert.Error(t, err)
 	})
 }
+
+func TestHeartbeatForwarder(t *testing.T) {
+	t.Run("connection level heartbeat propagates", func(t *testing.T) {
+		socket, _, _ := honeybeetest.SetupTestSocket(t)
+		var pongHandler func(string) error
+		socket.SetPongHandlerFunc = func(h func(string) error) { pongHandler = h }
+
+		conn, err := transport.NewConnectionFromSocket(socket, nil, nil)
+		assert.NoError(t, err)
+
+		heartbeat := make(chan struct{}, 1)
+		ctx, cancel := context.WithCancel(context.Background())
+		defer cancel()
+
+		go RunHeartbeatForwarder(ctx, conn, heartbeat, nil)
+
+		honeybeetest.Eventually(t, func() bool {
+			return pongHandler != nil
+		}, "expected Connection to register PongHandler")
+
+		if pongHandler == nil {
+			t.Fatal("pong handler was never set")
+		}
+
+		pongHandler("") // Trigger pong
+
+		select {
+		case <-heartbeat:
+		case <-time.After(time.Second):
+			t.Fatal("pong did not propagate to worker heartbeat")
+		}
+	})
+}

outbound/worker.go

@@ -208,11 +208,15 @@ func (s *Session) Start(
 
 		// start session
 		var wg sync.WaitGroup
-		wg.Add(2)
+		wg.Add(3)
 		go func() {
 			defer wg.Done()
 			RunReader(sctx, onStop, conn, s.messages, s.heartbeat, s.logger)
 		}()
+		go func() {
+			defer wg.Done()
+			RunHeartbeatForwarder(sctx, conn, s.heartbeat, s.logger)
+		}()
 		go func() {
 			defer wg.Done()
 			RunStopMonitor(sctx, onStop, conn, s.keepalive, s.logger)
@@ -289,6 +293,29 @@ func RunReader(
 	}
 }
 
+func RunHeartbeatForwarder(
+	ctx context.Context,
+	conn *transport.Connection,
+	heartbeat chan<- struct{},
+	logger *slog.Logger,
+) {
+	for {
+		select {
+		case <-ctx.Done():
+			return
+		case <-conn.Heartbeat():
+			select {
+			case heartbeat <- struct{}{}:
+				if logger != nil {
+					logger.Debug("ping-pong heartbeat")
+				}
+			case <-ctx.Done():
+				return
+			}
+		}
+	}
+}
+
 func RunStopMonitor(
 	ctx context.Context,
 	onStop func(),

outbound/worker_session_inner_test.go

@@ -144,6 +144,39 @@ func TestRunReader(t *testing.T) {
 	})
 }
 
+func TestHeartbeatForwarder(t *testing.T) {
+	t.Run("connection level heartbeat propagates", func(t *testing.T) {
+		socket, _, _ := honeybeetest.SetupTestSocket(t)
+		var pongHandler func(string) error
+		socket.SetPongHandlerFunc = func(h func(string) error) { pongHandler = h }
+
+		conn, err := transport.NewConnectionFromSocket(socket, nil, nil)
+		assert.NoError(t, err)
+
+		heartbeat := make(chan struct{}, 1)
+		ctx, cancel := context.WithCancel(context.Background())
+		defer cancel()
+
+		go RunHeartbeatForwarder(ctx, conn, heartbeat, nil)
+
+		honeybeetest.Eventually(t, func() bool {
+			return pongHandler != nil
+		}, "expected Connection to register PongHandler")
+
+		if pongHandler == nil {
+			t.Fatal("pong handler was never set")
+		}
+
+		pongHandler("") // Trigger pong
+
+		select {
+		case <-heartbeat:
+		case <-time.After(time.Second):
+			t.Fatal("pong did not propagate to worker heartbeat")
+		}
+	})
+}
+
 func TestRunStopMonitor(t *testing.T) {
 	t.Run("keepalive signal calls conn.Close and cancel", func(t *testing.T) {
 		conn, _, _, _ := setupTestConnection(t)

transport/config.go

@@ -10,6 +10,7 @@ type CloseHandler func(code int, text string) error
 type ConnectionConfig struct {
 	CloseHandler       CloseHandler
 	WriteTimeout       time.Duration
+	PingInterval       time.Duration
 	IncomingBufferSize int
 	ErrorsBufferSize   int
 	LoggingEnabled     bool
@@ -41,6 +42,7 @@ func GetDefaultConnectionConfig() *ConnectionConfig {
 	return &ConnectionConfig{
 		CloseHandler:       nil,
 		WriteTimeout:       30 * time.Second,
+		PingInterval:       20 * time.Second,
 		IncomingBufferSize: 100,
 		ErrorsBufferSize:   10,
 		LoggingEnabled:     true,
@@ -53,7 +55,7 @@ func GetDefaultRetryConfig() *RetryConfig {
 	return &RetryConfig{
 		MaxRetries:   0, // Infinite retries
 		InitialDelay: 1 * time.Second,
-		MaxDelay:     5 * time.Second,
+		MaxDelay:     60 * time.Second,
 		JitterFactor: 0.5,
 	}
 }
@@ -109,6 +111,13 @@ func validateWriteTimeout(value time.Duration) error {
 	return nil
 }
 
+func validatePingInterval(value time.Duration) error {
+	if value < 0 {
+		return InvalidPingInterval
+	}
+	return nil
+}
+
 func validateBufferSize(value int) error {
 	if value < 1 {
 		return InvalidBufferSize
@@ -163,6 +172,18 @@ func WithWriteTimeout(value time.Duration) ConnectionOption {
 	}
 }
 
+// When PingInterval is set to zero, ping frames are disabled.
+func WithPingInterval(value time.Duration) ConnectionOption {
+	return func(c *ConnectionConfig) error {
+		err := validatePingInterval(value)
+		if err != nil {
+			return err
+		}
+		c.PingInterval = value
+		return nil
+	}
+}
+
 func WithIncomingBufferSize(value int) ConnectionOption {
 	return func(c *ConnectionConfig) error {
 		if err := validateBufferSize(value); err != nil {

transport/config_test.go

@@ -16,6 +16,7 @@ func TestNewConnectionConfig(t *testing.T) {
 	assert.Equal(t, conf, &ConnectionConfig{
 		CloseHandler:       nil,
 		WriteTimeout:       30 * time.Second,
+		PingInterval:       20 * time.Second,
 		IncomingBufferSize: 100,
 		ErrorsBufferSize:   10,
 		LoggingEnabled:     true,
@@ -39,6 +40,7 @@ func TestDefaultConnectionConfig(t *testing.T) {
 	assert.Equal(t, conf, &ConnectionConfig{
 		CloseHandler:       nil,
 		WriteTimeout:       30 * time.Second,
+		PingInterval:       20 * time.Second,
 		IncomingBufferSize: 100,
 		ErrorsBufferSize:   10,
 		LoggingEnabled:     true,
@@ -53,7 +55,7 @@ func TestDefaultRetryConnectionConfig(t *testing.T) {
 	assert.Equal(t, conf, &RetryConfig{
 		MaxRetries:   0,
 		InitialDelay: 1 * time.Second,
-		MaxDelay:     5 * time.Second,
+		MaxDelay:     60 * time.Second,
 		JitterFactor: 0.5,
 	})
 }

transport/connection.go

@@ -5,6 +5,7 @@ import (
 	"errors"
 	"fmt"
 	"log/slog"
+	"math/rand"
 	"net/url"
 	"sync"
 	"time"
@@ -45,6 +46,7 @@ type Connection struct {
 	logger *slog.Logger
 
 	incoming  chan []byte
+	heartbeat chan struct{}
 	errors    chan error
 	done      chan struct{}
 
@@ -79,6 +81,7 @@ func NewConnection(urlStr string, config *ConnectionConfig, logger *slog.Logger)
 		config:    config,
 		logger:    logger,
 		incoming:  make(chan []byte, config.IncomingBufferSize),
+		heartbeat: make(chan struct{}, 1),
 		errors:    make(chan error, config.ErrorsBufferSize),
 		state:     StateDisconnected,
 		done:      make(chan struct{}),
@@ -109,6 +112,7 @@ func NewConnectionFromSocket(
 		config:    config,
 		logger:    logger,
 		incoming:  make(chan []byte, config.IncomingBufferSize),
+		heartbeat: make(chan struct{}, 1),
 		errors:    make(chan error, config.ErrorsBufferSize),
 		state:     StateConnected,
 		done:      make(chan struct{}),
@@ -118,6 +122,8 @@ func NewConnectionFromSocket(
 		socket.SetCloseHandler(config.CloseHandler)
 	}
 
+	conn.setupPongHandler()
+	conn.startPinger()
 	conn.startReader()
 
 	return conn, nil
@@ -164,6 +170,8 @@ func (c *Connection) Connect(ctx context.Context) error {
 		c.logger.Info("connected")
 	}
 
+	c.setupPongHandler()
+	c.startPinger()
 	c.startReader()
 
 	return nil
@@ -336,6 +344,48 @@ func (c *Connection) startReader() {
 	}()
 }
 
+func (c *Connection) setupPongHandler() {
+	c.socket.SetPongHandler(func(appData string) error {
+		select {
+		case c.heartbeat <- struct{}{}:
+		default:
+		}
+		return nil
+	})
+}
+
+func (c *Connection) startPinger() {
+	if c.config.PingInterval <= 0 {
+		return
+	}
+
+	c.wg.Add(1)
+	go func() {
+		defer c.wg.Done()
+		defer c.shutdownInternal()
+
+		// Calculate 10% jitter window
+		jitter := c.config.PingInterval / 10
+
+		for {
+			offset := time.Duration(rand.Int63n(int64(jitter*2))) - jitter
+			next := c.config.PingInterval + offset
+			timer := time.NewTimer(next)
+			select {
+			case <-c.done:
+				timer.Stop()
+				return
+			case <-timer.C:
+				deadline := time.Now().Add(c.config.WriteTimeout)
+				if err := c.socket.WriteControl(websocket.PingMessage, nil, deadline); err != nil {
+					return
+				}
+			}
+		}
+	}()
+
+}
+
 func (c *Connection) Send(data []byte) error {
 	c.writeMu.Lock()
 	defer c.writeMu.Unlock()
@@ -368,6 +418,10 @@ func (c *Connection) Incoming() <-chan []byte {
 	return c.incoming
 }
 
+func (c *Connection) Heartbeat() <-chan struct{} {
+	return c.heartbeat
+}
+
 func (c *Connection) Errors() <-chan error {
 	return c.errors
 }

transport/connection_test.go

@@ -537,6 +537,56 @@ func TestConnectionErrors(t *testing.T) {
 	})
 }
 
+func TestConnectionHeartbeat(t *testing.T) {
+	t.Run("pinger sends ping frames", func(t *testing.T) {
+		pingCount := atomic.Int32{}
+		socket, _, _ := honeybeetest.SetupTestSocket(t)
+		socket.WriteControlFunc = func(mt int, d []byte, dl time.Time) error {
+			if mt == websocket.PingMessage {
+				pingCount.Add(1)
+			}
+			return nil
+		}
+
+		conf, err := NewConnectionConfig(
+			WithPingInterval(10 * time.Millisecond),
+		)
+		assert.NoError(t, err)
+
+		conn, _ := NewConnectionFromSocket(socket, conf, nil)
+		defer conn.Close()
+
+		honeybeetest.Eventually(t,
+			func() bool { return pingCount.Load() >= 2 },
+			"expected pinger to fire")
+	})
+
+	t.Run("pong handler triggers heartbeat channel", func(t *testing.T) {
+		var handler func(string) error
+		socket, _, _ := honeybeetest.SetupTestSocket(t)
+		socket.SetPongHandlerFunc = func(h func(string) error) { handler = h }
+
+		conn, _ := NewConnectionFromSocket(socket, nil, nil)
+		defer conn.Close()
+
+		honeybeetest.Eventually(t, func() bool {
+			return handler != nil
+		}, "expected Connection to register PongHandler")
+
+		if handler == nil {
+			t.Fatal("pong handler was never set")
+		}
+
+		handler("") // Simulate inbound pong
+
+		select {
+		case <-conn.Heartbeat():
+		case <-time.After(time.Second):
+			t.Fatal("heartbeat not signaled on pong")
+		}
+	})
+}
+
 // Test helpers
 
 func setupTestConnection(t *testing.T) (

transport/errors.go

@@ -9,6 +9,7 @@ var (
 
 	// Configuration Errors
 	InvalidWriteTimeout      = errors.New("write timeout cannot be negative")
+	InvalidPingInterval      = errors.New("ping interval cannot be negative")
 	InvalidBufferSize        = errors.New("buffer size must be greater than zero")
 	InvalidRetryMaxRetries   = errors.New("max retry count cannot be negative")
 	InvalidRetryInitialDelay = errors.New("initial delay must be positive")

transport/logging_test.go

@@ -87,9 +87,9 @@ func TestConnectLogging(t *testing.T) {
 		expected := []honeybeetest.ExpectedLog{
 			log(slog.LevelDebug, "connecting", map[string]any{}),
 			log(slog.LevelDebug, "dialing", map[string]any{"attempt": 1}),
-			log(slog.LevelDebug, "dial failed, retrying", map[string]any{"attempt": 1, "error": dialErr}),
+			log(slog.LevelWarn, "dial failed, retrying", map[string]any{"attempt": 1, "error": dialErr}),
 			log(slog.LevelDebug, "dialing", map[string]any{"attempt": 2}),
-			log(slog.LevelDebug, "dial failed, retrying", map[string]any{"attempt": 2, "error": dialErr}),
+			log(slog.LevelWarn, "dial failed, retrying", map[string]any{"attempt": 2, "error": dialErr}),
 			log(slog.LevelDebug, "dialing", map[string]any{"attempt": 3}),
 			log(slog.LevelError, "dial failed, max retries reached", map[string]any{"attempt": 3, "error": dialErr}),
 			log(slog.LevelError, "connection failed", map[string]any{"error": dialErr}),
@@ -136,9 +136,9 @@ func TestConnectLogging(t *testing.T) {
 		expected := []honeybeetest.ExpectedLog{
 			log(slog.LevelDebug, "connecting", map[string]any{}),
 			log(slog.LevelDebug, "dialing", map[string]any{"attempt": 1}),
-			log(slog.LevelDebug, "dial failed, retrying", map[string]any{"attempt": 1, "error": dialErr}),
+			log(slog.LevelWarn, "dial failed, retrying", map[string]any{"attempt": 1, "error": dialErr}),
 			log(slog.LevelDebug, "dialing", map[string]any{"attempt": 2}),
-			log(slog.LevelDebug, "dial failed, retrying", map[string]any{"attempt": 2, "error": dialErr}),
+			log(slog.LevelWarn, "dial failed, retrying", map[string]any{"attempt": 2, "error": dialErr}),
 			log(slog.LevelDebug, "dialing", map[string]any{"attempt": 3}),
 			log(slog.LevelDebug, "dial successful", map[string]any{"attempt": 3}),
 			log(slog.LevelInfo, "connected", map[string]any{}),

transport/socket.go

@@ -88,7 +88,7 @@ func AcquireSocket(
 		delay := retryMgr.CalculateDelay()
 
 		if logger != nil {
-			logger.Debug("dial failed, retrying",
+			logger.Warn("dial failed, retrying",
 				"error", err,
 				"attempt", retryMgr.RetryCount()+1,
 				"next_delay", delay)

types/types.go

@@ -15,12 +15,14 @@ type Dialer interface {
 
 type Socket interface {
 	WriteMessage(messageType int, data []byte) error
+	WriteControl(messageType int, data []byte, deadline time.Time) error
 	ReadMessage() (messageType int, p []byte, err error)
 	Close() error
 
 	SetReadDeadline(t time.Time) error
 	SetWriteDeadline(t time.Time) error
 	SetCloseHandler(h func(code int, text string) error)
+	SetPongHandler(h func(appData string) error)
 }
 
 type ReceivedMessage struct {