vendor: upgrade grpc/grpc-go to v1.7.4

Signed-off-by: Gyuho Lee <gyuhox@gmail.com>

cmd/vendor/google.golang.org/grpc/rpc_util.go

@@ -567,6 +567,6 @@ const SupportPackageIsVersion3 = true
 const SupportPackageIsVersion4 = true
 
 // Version is the current grpc version.
-const Version = "1.7.3"
+const Version = "1.7.4"
 
 const grpcUA = "grpc-go/" + Version

cmd/vendor/google.golang.org/grpc/transport/handler_server.go

@@ -123,10 +123,9 @@ type serverHandlerTransport struct {
 	// when WriteStatus is called.
 	writes chan func()
 
-	mu sync.Mutex
-	// streamDone indicates whether WriteStatus has been called and writes channel
-	// has been closed.
-	streamDone bool
+	// block concurrent WriteStatus calls
+	// e.g. grpc/(*serverStream).SendMsg/RecvMsg
+	writeStatusMu sync.Mutex
 }
 
 func (ht *serverHandlerTransport) Close() error {
@@ -177,13 +176,9 @@ func (ht *serverHandlerTransport) do(fn func()) error {
 }
 
 func (ht *serverHandlerTransport) WriteStatus(s *Stream, st *status.Status) error {
-	ht.mu.Lock()
-	if ht.streamDone {
-		ht.mu.Unlock()
-		return nil
-	}
-	ht.streamDone = true
-	ht.mu.Unlock()
+	ht.writeStatusMu.Lock()
+	defer ht.writeStatusMu.Unlock()
+
 	err := ht.do(func() {
 		ht.writeCommonHeaders(s)
 
@@ -222,7 +217,11 @@ func (ht *serverHandlerTransport) WriteStatus(s *Stream, st *status.Status) erro
 			}
 		}
 	})
-	close(ht.writes)
+
+	if err == nil { // transport has not been closed
+		ht.Close()
+		close(ht.writes)
+	}
 	return err
 }
 

glide.lock

@@ -1,5 +1,5 @@
-hash: 775ef3aaeb7c16c54b68880b78cc6f4bccd40798f5b923d37bfa50b1b8867ca5
-updated: 2017-11-30T10:02:20.77689-08:00
+hash: 080dbed5470dced2e24e832b01c048cf89c4337bb544bf8d73aee6d4efcfff09
+updated: 2017-12-04T14:26:30.743859-08:00
 imports:
 - name: github.com/beorn7/perks
   version: 4c0e84591b9aa9e6dcfdf3e020114cd81f89d5f9
@@ -158,7 +158,7 @@ imports:
   subpackages:
   - googleapis/rpc/status
 - name: google.golang.org/grpc
-  version: 401e0e00e4bb830a10496d64cd95e068c5bf50de
+  version: 9a2334748bab9638f1480ad4f0ac6ac0c6c3a486
   subpackages:
   - balancer
   - codes

glide.yaml

@@ -108,7 +108,7 @@ import:
   subpackages:
   - rate
 - package: google.golang.org/grpc
-  version: v1.7.3
+  version: v1.7.4
   subpackages:
   - codes
   - credentials