90 lines
1.8 KiB
Go
90 lines
1.8 KiB
Go
package errors
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import (
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"fmt"
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"io"
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)
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type werror struct {
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cause error
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msg string
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*Stack
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}
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func (w *werror) Error() string {
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if w.cause == nil {
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return w.msg
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}
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if w.msg != "" {
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return w.msg + ": " + w.cause.Error()
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} else {
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return w.cause.Error()
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}
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}
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func (w *werror) Format(s fmt.State, verb rune) {
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_, _ = io.WriteString(s, w.Error())
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}
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func (w *werror) Unwrap() error { return w.cause }
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// New returns an error with the supplied message.
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// New also records the stack trace at the point it was called.
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func New(message string) error {
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return &werror{
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msg: message,
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Stack: Callers(0),
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}
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}
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// Errorf formats according to a format specifier and returns the string
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// as a value that satisfies error.
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// Errorf also records the stack trace at the point it was called.
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func Errorf(format string, args ...interface{}) error {
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return &werror{
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msg: fmt.Sprintf(format, args...),
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Stack: Callers(0),
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}
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}
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// WithStack annotates err with a stack trace at the point WithStack was called.
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// If err is nil, WithStack returns nil.
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func WithStack(err error) error {
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if err == nil {
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return nil
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}
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return &werror{
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err,
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"",
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Callers(0),
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}
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}
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// Wrap returns an error annotating err with a stack trace
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// at the point Wrap is called, and the supplied message.
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// If err is nil, Wrap returns nil.
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func Wrap(err error, message string) error {
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if err == nil {
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return nil
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}
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return &werror{
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err,
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message,
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Callers(0),
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}
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}
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// Wrapf returns an error annotating err with a stack trace
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// at the point Wrapf is called, and the format specifier.
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// If err is nil, Wrapf returns nil.
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func Wrapf(err error, format string, args ...interface{}) error {
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if err == nil {
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return nil
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}
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return &werror{
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err,
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fmt.Sprintf(format, args...),
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Callers(0),
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}
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}
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