snapshot of https://github.com/seaweedfs/seaweedfs.git (master, 2026-09-16; blobs > 131072B omitted)

weed/util/net_timeout.go

@@ -0,0 +1,182 @@
+package util
+
+import (
+	"net"
+	"sync"
+	"time"
+
+	"github.com/seaweedfs/seaweedfs/weed/glog"
+
+	"github.com/seaweedfs/seaweedfs/weed/stats"
+)
+
+// Listener wraps a net.Listener, and gives a place to store the timeout
+// parameters. On Accept, it will wrap the net.Conn with our own Conn for us.
+type Listener struct {
+	net.Listener
+	Timeout time.Duration
+}
+
+func (l *Listener) Accept() (net.Conn, error) {
+	c, err := l.Listener.Accept()
+	if err != nil {
+		return nil, err
+	}
+	stats.ConnectionOpen()
+	tc := &Conn{
+		Conn:    c,
+		Timeout: l.Timeout,
+	}
+	return tc, nil
+}
+
+// Conn wraps a net.Conn and implements a "no activity timeout".
+// Any activity (read or write) resets the deadline, so the connection
+// only times out when there's no activity in either direction.
+//
+// Callers may also set deadlines directly — net/http's server does this
+// to interrupt a blocked read (abortPendingRead sets a deadline in the
+// past) and to enforce its own Read/Write timeouts. The activity
+// extension must never overwrite such an externally-set deadline, or the
+// interrupt is lost and the read stays blocked until the activity
+// timeout fires (wedging connection drain on shutdown for up to the full
+// idle timeout). mu serializes deadline updates, and while an external
+// deadline is in force on a direction the activity extension for that
+// direction is suspended; it resumes once the caller clears the deadline
+// (sets the zero time).
+type Conn struct {
+	net.Conn
+	Timeout  time.Duration
+	isClosed bool
+
+	mu                    sync.Mutex
+	externalReadDeadline  bool
+	externalWriteDeadline bool
+}
+
+func (c *Conn) SetDeadline(t time.Time) error {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	c.externalReadDeadline = !t.IsZero()
+	c.externalWriteDeadline = !t.IsZero()
+	return c.Conn.SetDeadline(t)
+}
+
+func (c *Conn) SetReadDeadline(t time.Time) error {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	c.externalReadDeadline = !t.IsZero()
+	return c.Conn.SetReadDeadline(t)
+}
+
+func (c *Conn) SetWriteDeadline(t time.Time) error {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	c.externalWriteDeadline = !t.IsZero()
+	return c.Conn.SetWriteDeadline(t)
+}
+
+// extendDeadline extends the connection deadline from now.
+// This implements "no activity timeout" - any activity keeps the
+// connection alive in both directions (a long write-only response must
+// keep the read deadline alive too, or net/http's background read would
+// time out and cancel the in-flight request). Each direction is extended
+// independently: an externally-managed deadline on one side (e.g. a
+// server WriteTimeout) must not leave the other side's deadline stale.
+func (c *Conn) extendDeadline() error {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	if c.Timeout <= 0 {
+		return nil
+	}
+	if !c.externalReadDeadline && !c.externalWriteDeadline {
+		return c.Conn.SetDeadline(time.Now().Add(c.Timeout))
+	}
+	if !c.externalReadDeadline {
+		if err := c.Conn.SetReadDeadline(time.Now().Add(c.Timeout)); err != nil {
+			return err
+		}
+	}
+	if !c.externalWriteDeadline {
+		if err := c.Conn.SetWriteDeadline(time.Now().Add(c.Timeout)); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (c *Conn) Read(b []byte) (count int, e error) {
+	// Extend deadline before reading - any activity keeps connection alive
+	if err := c.extendDeadline(); err != nil {
+		return 0, err
+	}
+	count, e = c.Conn.Read(b)
+	if e == nil {
+		stats.BytesIn(int64(count))
+	}
+	return
+}
+
+func (c *Conn) Write(b []byte) (count int, e error) {
+	// Extend deadline before writing - any activity keeps connection alive
+	if err := c.extendDeadline(); err != nil {
+		return 0, err
+	}
+	count, e = c.Conn.Write(b)
+	if e == nil {
+		stats.BytesOut(int64(count))
+	}
+	return
+}
+
+func (c *Conn) Close() error {
+	err := c.Conn.Close()
+	if err == nil {
+		if !c.isClosed {
+			stats.ConnectionClose()
+			c.isClosed = true
+		}
+	}
+	return err
+}
+
+func NewListener(addr string, timeout time.Duration) (ipListener net.Listener, err error) {
+	listener, err := net.Listen("tcp", addr)
+	if err != nil {
+		return
+	}
+
+	ipListener = &Listener{
+		Listener: listener,
+		Timeout:  timeout,
+	}
+
+	return
+}
+
+func NewIpAndLocalListeners(host string, port int, timeout time.Duration) (ipListener net.Listener, localListener net.Listener, err error) {
+	listener, err := net.Listen("tcp", JoinHostPort(host, port))
+	if err != nil {
+		return
+	}
+
+	ipListener = &Listener{
+		Listener: listener,
+		Timeout:  timeout,
+	}
+
+	if host != "localhost" && host != "" && host != "0.0.0.0" && host != "127.0.0.1" && host != "[::]" && host != "[::1]" {
+		listener, err = net.Listen("tcp", JoinHostPort("localhost", port))
+		if err != nil {
+			glog.V(0).Infof("skip starting on %s:%d: %v", host, port, err)
+			return ipListener, nil, nil
+		}
+
+		localListener = &Listener{
+			Listener: listener,
+			Timeout:  timeout,
+		}
+	}
+
+	return
+}