vendor protobuf & grpc

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>

services/server/server.go

@@ -52,6 +52,7 @@ import (
 	"github.com/pkg/errors"
 	bolt "go.etcd.io/bbolt"
 	"google.golang.org/grpc"
+	"google.golang.org/grpc/backoff"
 	"google.golang.org/grpc/credentials"
 )
 
@@ -456,9 +457,14 @@ func (pc *proxyClients) getClient(address string) (*grpc.ClientConn, error) {
 		return c, nil
 	}
 
+	backoffConfig := backoff.DefaultConfig
+	backoffConfig.MaxDelay = 3 * time.Second
+	connParams := grpc.ConnectParams{
+		Backoff: backoffConfig,
+	}
 	gopts := []grpc.DialOption{
 		grpc.WithInsecure(),
-		grpc.WithBackoffMaxDelay(3 * time.Second),
+		grpc.WithConnectParams(connParams),
 		grpc.WithContextDialer(dialer.ContextDialer),
 
 		// TODO(stevvooe): We may need to allow configuration of this on the client.