feat: support grpc client keepalive config (#2950)

zrpc/config.go

@@ -1,6 +1,8 @@
 package zrpc
 
 import (
+	"time"
+
 	"github.com/zeromicro/go-zero/core/discov"
 	"github.com/zeromicro/go-zero/core/service"
 	"github.com/zeromicro/go-zero/core/stores/redis"
@@ -14,6 +16,19 @@ type (
 	// ServerMiddlewaresConf defines whether to use server middlewares.
 	ServerMiddlewaresConf = internal.ServerMiddlewaresConf
 
+	// A RpcClientConf is a rpc client config.
+	RpcClientConf struct {
+		Etcd          discov.EtcdConf `json:",optional,inherit"`
+		Endpoints     []string        `json:",optional"`
+		Target        string          `json:",optional"`
+		App           string          `json:",optional"`
+		Token         string          `json:",optional"`
+		NonBlock      bool            `json:",optional"`
+		Timeout       int64           `json:",default=2000"`
+		KeepaliveTime time.Duration   `json:",default=20s"`
+		Middlewares   ClientMiddlewaresConf
+	}
+
 	// A RpcServerConf is a rpc server config.
 	RpcServerConf struct {
 		service.ServiceConf
@@ -29,18 +44,6 @@ type (
 		Health      bool `json:",default=true"`
 		Middlewares ServerMiddlewaresConf
 	}
-
-	// A RpcClientConf is a rpc client config.
-	RpcClientConf struct {
-		Etcd        discov.EtcdConf `json:",optional,inherit"`
-		Endpoints   []string        `json:",optional"`
-		Target      string          `json:",optional"`
-		App         string          `json:",optional"`
-		Token       string          `json:",optional"`
-		NonBlock    bool            `json:",optional"`
-		Timeout     int64           `json:",default=2000"`
-		Middlewares ClientMiddlewaresConf
-	}
 )
 
 // NewDirectClientConf returns a RpcClientConf.