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errors.go
executable file
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errors.go
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package errors
import (
goerrors "errors"
"fmt"
"io"
)
func New(message string) error {
return goerrors.New(message)
}
func WithStack(err error) error {
if err == nil {
return nil
}
return &withStack{
err,
callers(),
}
}
type withStack struct {
error
*stack
}
func (w *withStack) Cause() error {
return w.error
}
func (w *withStack) Format(s fmt.State, verb rune) {
switch verb {
case 'v':
if s.Flag('+') {
fmt.Fprintf(s, "%+v", w.Cause())
w.stack.Format(s, verb)
return
}
fallthrough
case 's':
io.WriteString(s, w.Error())
case 'q':
fmt.Fprintf(s, "%q", w.Error())
}
}
func WithCode(cause error, code string, message string) error {
return &WithCodeError{
cause: cause,
code: code,
message: message,
}
}
type WithCodeError struct {
cause error
code string
message string
}
func (w *WithCodeError) Error() string { return w.code + ": " + w.message }
func (w *WithCodeError) Cause() error { return w.cause }
func (w *WithCodeError) Code() string { return w.code }
func (w *WithCodeError) Message() string { return w.message }
func (w *WithCodeError) Format(s fmt.State, verb rune) {
switch verb {
case 'v':
if s.Flag('+') {
fmt.Fprintf(s, "%+v\n", w.Cause())
io.WriteString(s, w.code+":"+w.message)
return
}
fallthrough
case 's', 'q':
io.WriteString(s, w.Error())
}
}
func Cause(err error) error {
type causer interface {
Cause() error
}
for err != nil {
cause, ok := err.(causer)
if !ok {
break
}
err = cause.Cause()
}
return err
}
func Code(err error) string {
type withCodeError interface {
Code() string
}
withCode, ok := err.(withCodeError)
if !ok {
return ""
}
return withCode.Code()
}
func AsWithCode(err error) *WithCodeError {
withCode, ok := err.(*WithCodeError)
if !ok {
return nil
}
return withCode
}