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errors.go
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/
errors.go
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// Copyright 2022 Douyu
//
// 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 xerror
import (
"fmt"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
const (
UnknownCode = 2
)
// Err struct
type Err struct {
Ecode int32 `json:"error"`
Msg string `json:"msg"`
Data interface{} `json:"data"`
}
// Error implements the error interface.
func (e *Err) Error() string {
if e == nil {
return "nil"
}
return fmt.Sprintf("xerror: ecode = %v msg = %s", e.GetEcode(), e.GetMsg())
}
// New returns an error object for the code, message.
func New(code codes.Code, message string) *Err {
if _, ok := msgs[code]; ok {
panic("code had been registered")
}
msgs[code] = message
return &Err{
Ecode: int32(code),
Msg: message,
Data: struct{}{},
}
}
// GetEcode return the packaged Ecode
func (e *Err) GetEcode() int32 {
if e != nil && e.Ecode != 0 {
return e.Ecode
}
return 0
}
// GetMsg return the Msg
func (e *Err) GetMsg() string {
if e != nil {
return e.Msg
}
return ""
}
// GetData return the Data
func (e *Err) GetData() interface{} {
if e != nil {
return e.Data
}
return nil
}
// WithMsg allows the programmer to override Msg and ruturn the new Err
func (e *Err) WithMsg(msg string) *Err {
return &Err{
Ecode: e.Ecode,
Msg: msg,
Data: e.Data,
}
}
// WithData allows the programmer to override Data and ruturn the new Err
func (e *Err) WithData(data interface{}) *Err {
return &Err{
Ecode: e.Ecode,
Msg: e.Msg,
Data: data,
}
}
// Convert try to convert an error to *Error.
// It supports wrapped errors.
func Convert(err error) *Err {
if err == nil {
return nil
}
if e, ok := err.(*Err); ok {
return e
}
// 将status.error转化为Err
gs, ok := status.FromError(err)
if ok {
return &Err{
Ecode: ErrsFromGRPCCode(gs.Code()),
Msg: gs.Message(),
Data: struct{}{},
}
}
return &Err{
Ecode: int32(UnknownCode),
Msg: err.Error(),
Data: struct{}{},
}
}
// GRPCStatus returns the Status represented by se.
func (e *Err) GRPCStatus() *status.Status {
s := status.New(GRPCCodeFromeErrs(e.Ecode), e.Msg)
return s
}