Add details to stream error response.

Makefile

@@ -5,7 +5,9 @@
 
 PKG=github.com/grpc-ecosystem/grpc-gateway
 GO_PLUGIN=bin/protoc-gen-go
-GO_PLUGIN_PKG=github.com/golang/protobuf/protoc-gen-go
+GO_PROTOBUF_REPO=github.com/golang/protobuf
+GO_PLUGIN_PKG=$(GO_PROTOBUF_REPO)/protoc-gen-go
+GO_PTYPES_ANY_PKG=$(GO_PROTOBUF_REPO)/ptypes/any
 SWAGGER_PLUGIN=bin/protoc-gen-swagger
 SWAGGER_PLUGIN_SRC= utilities/doc.go \
 		    utilities/pattern.go \
@@ -91,7 +93,7 @@ $(GO_PLUGIN):
 	go build -o $@ $(GO_PLUGIN_PKG)
 
 $(RUNTIME_GO): $(RUNTIME_PROTO) $(GO_PLUGIN)
-	protoc -I $(PROTOC_INC_PATH) --plugin=$(GO_PLUGIN) -I. --go_out=$(PKGMAP):. $(RUNTIME_PROTO)
+	protoc -I $(PROTOC_INC_PATH) --plugin=$(GO_PLUGIN) -I $(GOPATH)/src/$(GO_PTYPES_ANY_PKG) -I. --go_out=$(PKGMAP):. $(RUNTIME_PROTO)
 
 $(OPENAPIV2_GO): $(OPENAPIV2_PROTO) $(GO_PLUGIN)
 	protoc -I $(PROTOC_INC_PATH) --plugin=$(GO_PLUGIN) -I. --go_out=$(PKGMAP):$(GOPATH)/src $(OPENAPIV2_PROTO)

runtime/handler.go

@@ -176,6 +176,7 @@ func streamChunk(result proto.Message, err error) map[string]proto.Message {
 				HttpCode:   int32(httpCode),
 				Message:    s.Message(),
 				HttpStatus: http.StatusText(httpCode),
+				Details:    s.Proto().GetDetails(),
 			},
 		}
 	}

runtime/handler_test.go

@@ -100,6 +100,7 @@ func TestForwardResponseStream(t *testing.T) {
 							HttpCode:   int32(httpCode),
 							Message:    st.Message(),
 							HttpStatus: http.StatusText(httpCode),
+							Details:    st.Proto().GetDetails(),
 						},
 					})
 					if err != nil {

runtime/internal/stream_chunk.proto

@@ -2,11 +2,14 @@ syntax = "proto3";
 package grpc.gateway.runtime;
 option go_package = "internal";
 
+import "google/protobuf/any.proto";
+
 // StreamError is a response type which is returned when
 // streaming rpc returns an error.
 message StreamError {
 	int32 grpc_code = 1;
 	int32 http_code = 2;
 	string message = 3;
 	string http_status = 4;
+	repeated google.protobuf.Any details = 5;
 }