Fix golint errors for non-generated code

benchmark/benchmark.go

@@ -137,7 +137,7 @@ func (s *testServer) FullDuplexCall(stream testpb.TestService_FullDuplexCallServ
 }
 
 func (s *testServer) HalfDuplexCall(stream testpb.TestService_HalfDuplexCallServer) error {
-	msgBuf := make([]*testpb.StreamingOutputCallRequest, 0)
+	var msgBuf []*testpb.StreamingOutputCallRequest
 	for {
 		in, err := stream.Recv()
 		if err == io.EOF {

benchmark/stats/counter.go

@@ -6,8 +6,8 @@ import (
 )
 
 var (
-	// Used for testing.
-	TimeNow func() time.Time = time.Now
+	// TimeNow is used for testing.
+	TimeNow = time.Now
 )
 
 const (

credentials/credentials.go

@@ -202,6 +202,7 @@ type TokenSource struct {
 	oauth2.TokenSource
 }
 
+// GetRequestMetadata gets the request metadata as a map from a TokenSource.
 func (ts TokenSource) GetRequestMetadata(ctx context.Context) (map[string]string, error) {
 	token, err := ts.Token()
 	if err != nil {

interop/client/client.go

@@ -47,8 +47,8 @@ import (
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/credentials"
-	"google.golang.org/grpc/metadata"
 	testpb "google.golang.org/grpc/interop/grpc_testing"
+	"google.golang.org/grpc/metadata"
 )
 
 var (
@@ -268,7 +268,7 @@ func doComputeEngineCreds(tc testpb.TestServiceClient) {
 	log.Println("ComputeEngineCreds done")
 }
 
-func getServiceAccountJsonKey() []byte {
+func getServiceAccountJSONKey() []byte {
 	jsonKey, err := ioutil.ReadFile(*serviceAccountKeyFile)
 	if err != nil {
 		log.Fatalf("Failed to read the service account key file: %v", err)
@@ -289,7 +289,7 @@ func doServiceAccountCreds(tc testpb.TestServiceClient) {
 	if err != nil {
 		log.Fatal("/TestService/UnaryCall RPC failed: ", err)
 	}
-	jsonKey := getServiceAccountJsonKey()
+	jsonKey := getServiceAccountJSONKey()
 	user := reply.GetUsername()
 	scope := reply.GetOauthScope()
 	if !strings.Contains(string(jsonKey), user) {

interop/server/server.go

@@ -156,7 +156,7 @@ func (s *testServer) FullDuplexCall(stream testpb.TestService_FullDuplexCallServ
 }
 
 func (s *testServer) HalfDuplexCall(stream testpb.TestService_HalfDuplexCallServer) error {
-	msgBuf := make([]*testpb.StreamingOutputCallRequest, 0)
+	var msgBuf []*testpb.StreamingOutputCallRequest
 	for {
 		in, err := stream.Recv()
 		if err == io.EOF {

transport/transport_test.go

@@ -438,7 +438,7 @@ func TestServerWithMisbehavedClient(t *testing.T) {
 			time.Sleep(time.Millisecond)
 			continue
 		}
-		for k, _ := range server.conns {
+		for k := range server.conns {
 			var ok bool
 			sc, ok = k.(*http2Server)
 			if !ok {
@@ -493,7 +493,7 @@ func TestServerWithMisbehavedClient(t *testing.T) {
 			t.Fatalf("Failed to write data: %v", err)
 		}
 		cc.writableChan <- 0
-		sent += 1
+		sent++
 	}
 	// Server sent a resetStream for s already.
 	code := http2RSTErrConvTab[http2.ErrCodeFlowControl]