130 lines
3.8 KiB
Go
130 lines
3.8 KiB
Go
/*
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*
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* Copyright 2017 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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// Package status implements errors returned by gRPC. These errors are
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// serialized and transmitted on the wire between server and client, and allow
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// for additional data to be transmitted via the Details field in the status
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// proto. gRPC service handlers should return an error created by this
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// package, and gRPC clients should expect a corresponding error to be
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// returned from the RPC call.
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//
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// This package upholds the invariants that a non-nil error may not
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// contain an OK code, and an OK code must result in a nil error.
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package status
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import (
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"fmt"
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"github.com/golang/protobuf/proto"
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spb "google.golang.org/genproto/googleapis/rpc/status"
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"google.golang.org/grpc/codes"
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)
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// statusError is an alias of a status proto. It implements error and Status,
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// and a nil statusError should never be returned by this package.
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type statusError spb.Status
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func (se *statusError) Error() string {
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p := (*spb.Status)(se)
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return fmt.Sprintf("rpc error: code = %s desc = %s", codes.Code(p.GetCode()), p.GetMessage())
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}
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func (se *statusError) status() *Status {
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return &Status{s: (*spb.Status)(se)}
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}
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// Status represents an RPC status code, message, and details. It is immutable
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// and should be created with New, Newf, or FromProto.
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type Status struct {
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s *spb.Status
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}
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// Code returns the status code contained in s.
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func (s *Status) Code() codes.Code {
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if s == nil || s.s == nil {
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return codes.OK
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}
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return codes.Code(s.s.Code)
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}
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// Message returns the message contained in s.
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func (s *Status) Message() string {
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if s == nil || s.s == nil {
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return ""
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}
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return s.s.Message
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}
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// Proto returns s's status as an spb.Status proto message.
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func (s *Status) Proto() *spb.Status {
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if s == nil {
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return nil
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}
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return proto.Clone(s.s).(*spb.Status)
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}
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// Err returns an immutable error representing s; returns nil if s.Code() is
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// OK.
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func (s *Status) Err() error {
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if s.Code() == codes.OK {
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return nil
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}
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return (*statusError)(s.s)
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}
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// New returns a Status representing c and msg.
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func New(c codes.Code, msg string) *Status {
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return &Status{s: &spb.Status{Code: int32(c), Message: msg}}
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}
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// Newf returns New(c, fmt.Sprintf(format, a...)).
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func Newf(c codes.Code, format string, a ...interface{}) *Status {
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return New(c, fmt.Sprintf(format, a...))
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}
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// Error returns an error representing c and msg. If c is OK, returns nil.
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func Error(c codes.Code, msg string) error {
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return New(c, msg).Err()
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}
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// Errorf returns Error(c, fmt.Sprintf(format, a...)).
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func Errorf(c codes.Code, format string, a ...interface{}) error {
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return Error(c, fmt.Sprintf(format, a...))
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}
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// ErrorProto returns an error representing s. If s.Code is OK, returns nil.
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func ErrorProto(s *spb.Status) error {
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return FromProto(s).Err()
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}
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// FromProto returns a Status representing s.
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func FromProto(s *spb.Status) *Status {
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return &Status{s: proto.Clone(s).(*spb.Status)}
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}
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// FromError returns a Status representing err if it was produced from this
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// package, otherwise it returns nil, false.
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func FromError(err error) (s *Status, ok bool) {
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if err == nil {
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return &Status{s: &spb.Status{Code: int32(codes.OK)}}, true
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}
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if s, ok := err.(*statusError); ok {
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return s.status(), true
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}
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return nil, false
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}
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