122 lines
3.8 KiB
Go
122 lines
3.8 KiB
Go
package runtime
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import (
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"io"
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"net/http"
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"github.com/golang/protobuf/proto"
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"golang.org/x/net/context"
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"google.golang.org/grpc"
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/grpclog"
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)
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// HTTPStatusFromCode converts a gRPC error code into the corresponding HTTP response status.
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func HTTPStatusFromCode(code codes.Code) int {
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switch code {
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case codes.OK:
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return http.StatusOK
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case codes.Canceled:
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return http.StatusRequestTimeout
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case codes.Unknown:
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return http.StatusInternalServerError
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case codes.InvalidArgument:
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return http.StatusBadRequest
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case codes.DeadlineExceeded:
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return http.StatusRequestTimeout
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case codes.NotFound:
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return http.StatusNotFound
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case codes.AlreadyExists:
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return http.StatusConflict
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case codes.PermissionDenied:
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return http.StatusForbidden
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case codes.Unauthenticated:
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return http.StatusUnauthorized
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case codes.ResourceExhausted:
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return http.StatusForbidden
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case codes.FailedPrecondition:
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return http.StatusPreconditionFailed
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case codes.Aborted:
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return http.StatusConflict
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case codes.OutOfRange:
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return http.StatusBadRequest
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case codes.Unimplemented:
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return http.StatusNotImplemented
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case codes.Internal:
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return http.StatusInternalServerError
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case codes.Unavailable:
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return http.StatusServiceUnavailable
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case codes.DataLoss:
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return http.StatusInternalServerError
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}
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grpclog.Printf("Unknown gRPC error code: %v", code)
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return http.StatusInternalServerError
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}
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var (
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// HTTPError replies to the request with the error.
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// You can set a custom function to this variable to customize error format.
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HTTPError = DefaultHTTPError
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// OtherErrorHandler handles the following error used by the gateway: StatusMethodNotAllowed StatusNotFound and StatusBadRequest
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OtherErrorHandler = DefaultOtherErrorHandler
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)
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type errorBody struct {
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Error string `json:"error"`
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Code int `json:"code"`
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}
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//Make this also conform to proto.Message for builtin JSONPb Marshaler
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func (e *errorBody) Reset() { *e = errorBody{} }
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func (e *errorBody) String() string { return proto.CompactTextString(e) }
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func (*errorBody) ProtoMessage() {}
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// DefaultHTTPError is the default implementation of HTTPError.
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// If "err" is an error from gRPC system, the function replies with the status code mapped by HTTPStatusFromCode.
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// If otherwise, it replies with http.StatusInternalServerError.
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//
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// The response body returned by this function is a JSON object,
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// which contains a member whose key is "error" and whose value is err.Error().
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func DefaultHTTPError(ctx context.Context, marshaler Marshaler, w http.ResponseWriter, _ *http.Request, err error) {
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const fallback = `{"error": "failed to marshal error message"}`
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w.Header().Del("Trailer")
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w.Header().Set("Content-Type", marshaler.ContentType())
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body := &errorBody{
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Error: grpc.ErrorDesc(err),
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Code: int(grpc.Code(err)),
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}
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buf, merr := marshaler.Marshal(body)
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if merr != nil {
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grpclog.Printf("Failed to marshal error message %q: %v", body, merr)
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w.WriteHeader(http.StatusInternalServerError)
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if _, err := io.WriteString(w, fallback); err != nil {
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grpclog.Printf("Failed to write response: %v", err)
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}
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return
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}
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md, ok := ServerMetadataFromContext(ctx)
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if !ok {
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grpclog.Printf("Failed to extract ServerMetadata from context")
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}
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handleForwardResponseServerMetadata(w, md)
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handleForwardResponseTrailerHeader(w, md)
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st := HTTPStatusFromCode(grpc.Code(err))
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w.WriteHeader(st)
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if _, err := w.Write(buf); err != nil {
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grpclog.Printf("Failed to write response: %v", err)
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}
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handleForwardResponseTrailer(w, md)
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}
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// DefaultOtherErrorHandler is the default implementation of OtherErrorHandler.
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// It simply writes a string representation of the given error into "w".
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func DefaultOtherErrorHandler(w http.ResponseWriter, _ *http.Request, msg string, code int) {
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http.Error(w, msg, code)
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}
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