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forgejo/modules/util/error.go
zeripath 716fcfcf72
Make every not exist error unwrappable to a fs.ErrNotExist (#20891)
A lot of our code is repeatedly testing if individual errors are
specific types of Not Exist errors. This is repetitative and unnecesary.
`Unwrap() error` provides a common way of labelling an error as a
NotExist error and we can/should use this.

This PR has chosen to use the common `io/fs` errors e.g.
`fs.ErrNotExist` for our errors. This is in some ways not completely
correct as these are not filesystem errors but it seems like a
reasonable thing to do and would allow us to simplify a lot of our code
to `errors.Is(err, fs.ErrNotExist)` instead of
`package.IsErr...NotExist(err)`

I am open to suggestions to use a different base error - perhaps
`models/db.ErrNotExist` if that would be felt to be better.


Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: delvh <dev.lh@web.de>
2022-10-18 07:50:37 +02:00

37 lines
1.1 KiB
Go

// Copyright 2022 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package util
import (
"errors"
)
// Common Errors forming the base of our error system
//
// Many Errors returned by Gitea can be tested against these errors
// using errors.Is.
var (
ErrInvalidArgument = errors.New("invalid argument")
ErrPermissionDenied = errors.New("permission denied")
ErrAlreadyExist = errors.New("resource already exists")
ErrNotExist = errors.New("resource does not exist")
)
// SilentWrap provides a simple wrapper for a wrapped error where the wrapped error message plays no part in the error message
// Especially useful for "untyped" errors created with "errors.New(…)" that can be classified as 'invalid argument', 'permission denied', 'exists already', or 'does not exist'
type SilentWrap struct {
Message string
Err error
}
// Error returns the message
func (w SilentWrap) Error() string {
return w.Message
}
// Unwrap returns the underlying error
func (w SilentWrap) Unwrap() error {
return w.Err
}