switch to idle timeout instead of read timeout

1 files changed, 65 insertions, 0 deletions

diff --git a/go/util/net_timeout.go b/go/util/net_timeout.go
new file mode 100644
index 000000000..410152a79
--- /dev/null
+++ b/go/util/net_timeout.go
@@ -0,0 +1,65 @@
+package util
+
+import (
+	"net"
+	"time"
+)
+
+// 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
+	ReadTimeout  time.Duration
+	WriteTimeout time.Duration
+}
+
+func (l *Listener) Accept() (net.Conn, error) {
+	c, err := l.Listener.Accept()
+	if err != nil {
+		return nil, err
+	}
+	tc := &Conn{
+		Conn:         c,
+		ReadTimeout:  l.ReadTimeout,
+		WriteTimeout: l.WriteTimeout,
+	}
+	return tc, nil
+}
+
+// Conn wraps a net.Conn, and sets a deadline for every read
+// and write operation.
+type Conn struct {
+	net.Conn
+	ReadTimeout  time.Duration
+	WriteTimeout time.Duration
+}
+
+func (c *Conn) Read(b []byte) (int, error) {
+	err := c.Conn.SetReadDeadline(time.Now().Add(c.ReadTimeout))
+	if err != nil {
+		return 0, err
+	}
+	return c.Conn.Read(b)
+}
+
+func (c *Conn) Write(b []byte) (int, error) {
+	err := c.Conn.SetWriteDeadline(time.Now().Add(c.WriteTimeout))
+	if err != nil {
+		return 0, err
+	}
+	return c.Conn.Write(b)
+}
+
+func NewListener(addr string, timeout time.Duration) (net.Listener, error) {
+	l, err := net.Listen("tcp", addr)
+	if err != nil {
+		return nil, err
+	}
+
+	tl := &Listener{
+		Listener:     l,
+		ReadTimeout:  timeout,
+		WriteTimeout: timeout,
+	}
+	return tl, nil
+}