feat: set default connection idle time for grpc servers (#1922)

* feat: set default connection idle time for grpc servers

* feat: add grpc health check

zrpc/internal/server.go

@@ -1,10 +1,16 @@
 package internal
 
 import (
+	"time"
+
 	"github.com/zeromicro/go-zero/core/stat"
 	"google.golang.org/grpc"
+	"google.golang.org/grpc/health"
+	"google.golang.org/grpc/keepalive"
 )
 
+const defaultConnectionIdleDuration = time.Minute * 5
+
 type (
 	// RegisterFn defines the method to register a server.
 	RegisterFn func(*grpc.Server)
@@ -20,6 +26,7 @@ type (
 
 	baseRpcServer struct {
 		address            string
+		health             *health.Server
 		metrics            *stat.Metrics
 		options            []grpc.ServerOption
 		streamInterceptors []grpc.StreamServerInterceptor
@@ -30,7 +37,11 @@ type (
 func newBaseRpcServer(address string, rpcServerOpts *rpcServerOptions) *baseRpcServer {
 	return &baseRpcServer{
 		address: address,
+		health:  health.NewServer(),
 		metrics: rpcServerOpts.metrics,
+		options: []grpc.ServerOption{grpc.KeepaliveParams(keepalive.ServerParameters{
+			MaxConnectionIdle: defaultConnectionIdleDuration,
+		})},
 	}
 }