add keepalive for client

pkg/net/rpc/warden/CHANGELOG.md

@@ -1,5 +1,9 @@
 ### net/rpc/warden
 
+##### Version 1.1.19
+1. 升级grpc至1.22.0
+2. client增加keepAlive选项
+
 ##### Version 1.1.18
 1. 修复resolver过滤导致的子集bug
 

pkg/net/rpc/warden/client.go

@@ -37,6 +37,8 @@ var (
 		Dial:              xtime.Duration(time.Second * 10),
 		Timeout:           xtime.Duration(time.Millisecond * 250),
 		Subset:            50,
+		KeepAliveInterval: xtime.Duration(time.Second * 60),
+		KeepAliveTimeout:  xtime.Duration(time.Second * 20),
 	}
 	_defaultClient *Client
 )
@@ -59,6 +61,9 @@ type ClientConfig struct {
 	Zone                   string
 	Subset                 int
 	NonBlock               bool
+	KeepAliveInterval      xtime.Duration
+	KeepAliveTimeout       xtime.Duration
+	KeepAliveWithoutStream bool
 }
 
 // Client is the framework's client side instance, it contains the ctx, opt and interceptors.
@@ -186,6 +191,12 @@ func (c *Client) SetConfig(conf *ClientConfig) (err error) {
 	if conf.Subset <= 0 {
 		conf.Subset = 50
 	}
+	if conf.KeepAliveInterval <= 0 {
+		conf.KeepAliveInterval = xtime.Duration(time.Second * 60)
+	}
+	if conf.KeepAliveTimeout <= 0 {
+		conf.KeepAliveTimeout = xtime.Duration(time.Second * 20)
+	}
 
 	// FIXME(maojian) check Method dial/timeout
 	c.mutex.Lock()