proxy: increase connection write timeout

We don't know how much time a container can be paused, hence connection
write timeout should be big enough to don't close the connection while
the container is paused.

fixes kata-containers/agent#231
fixes kata-containers#70

Signed-off-by: Julio Montes <[email protected]>

proxy.go

@@ -32,6 +32,8 @@ const (
 	termSignal = syscall.SIGTERM
 )
 
+const year time.Duration = time.Hour * 24 * 365
+
 var debug = false
 
 // version is the proxy version. This variable is populated at build time.
@@ -43,7 +45,13 @@ var crashOnError = false
 var proxyLog = logrus.New()
 
 func serve(servConn io.ReadWriteCloser, proto, addr string, results chan error) (net.Listener, error) {
-	session, err := yamux.Client(servConn, nil)
+	sessionConfig := yamux.DefaultConfig()
+	sessionConfig.EnableKeepAlive = true
+	// 10 seconds is too early to suspect that a problem with the underlying connection has occurred.
+	// Since we don't know how much time a container can be paused let's set this timeout to 100 years,
+	// probably we won't be there when that occurs ;(
+	sessionConfig.ConnectionWriteTimeout = year * 100
+	session, err := yamux.Client(servConn, sessionConfig)
 	if err != nil {
 		return nil, err
 	}