| package runtime |
| |
| import ( |
| "io" |
| "net/http" |
| |
| "context" |
| "google.golang.org/grpc/codes" |
| "google.golang.org/grpc/grpclog" |
| "google.golang.org/grpc/status" |
| ) |
| |
| // ProtoErrorHandlerFunc handles the error as a gRPC error generated via status package and replies to the request. |
| type ProtoErrorHandlerFunc func(context.Context, *ServeMux, Marshaler, http.ResponseWriter, *http.Request, error) |
| |
| var _ ProtoErrorHandlerFunc = DefaultHTTPProtoErrorHandler |
| |
| // DefaultHTTPProtoErrorHandler is an implementation of HTTPError. |
| // If "err" is an error from gRPC system, the function replies with the status code mapped by HTTPStatusFromCode. |
| // If otherwise, it replies with http.StatusInternalServerError. |
| // |
| // The response body returned by this function is a Status message marshaled by a Marshaler. |
| // |
| // Do not set this function to HTTPError variable directly, use WithProtoErrorHandler option instead. |
| func DefaultHTTPProtoErrorHandler(ctx context.Context, mux *ServeMux, marshaler Marshaler, w http.ResponseWriter, _ *http.Request, err error) { |
| // return Internal when Marshal failed |
| const fallback = `{"code": 13, "message": "failed to marshal error message"}` |
| |
| s, ok := status.FromError(err) |
| if !ok { |
| s = status.New(codes.Unknown, err.Error()) |
| } |
| |
| w.Header().Del("Trailer") |
| |
| contentType := marshaler.ContentType() |
| // Check marshaler on run time in order to keep backwards compatability |
| // An interface param needs to be added to the ContentType() function on |
| // the Marshal interface to be able to remove this check |
| if httpBodyMarshaler, ok := marshaler.(*HTTPBodyMarshaler); ok { |
| pb := s.Proto() |
| contentType = httpBodyMarshaler.ContentTypeFromMessage(pb) |
| } |
| w.Header().Set("Content-Type", contentType) |
| |
| buf, merr := marshaler.Marshal(s.Proto()) |
| if merr != nil { |
| grpclog.Infof("Failed to marshal error message %q: %v", s.Proto(), merr) |
| w.WriteHeader(http.StatusInternalServerError) |
| if _, err := io.WriteString(w, fallback); err != nil { |
| grpclog.Infof("Failed to write response: %v", err) |
| } |
| return |
| } |
| |
| md, ok := ServerMetadataFromContext(ctx) |
| if !ok { |
| grpclog.Infof("Failed to extract ServerMetadata from context") |
| } |
| |
| handleForwardResponseServerMetadata(w, mux, md) |
| handleForwardResponseTrailerHeader(w, md) |
| st := HTTPStatusFromCode(s.Code()) |
| w.WriteHeader(st) |
| if _, err := w.Write(buf); err != nil { |
| grpclog.Infof("Failed to write response: %v", err) |
| } |
| |
| handleForwardResponseTrailer(w, md) |
| } |