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