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Make every not exist error unwrappable to a fs.ErrNotExist (#20891)

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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>
This commit is contained in:
zeripath 2022-10-18 06:50:37 +01:00 • committed by GitHub
parent 6af1a0c8c0
commit 716fcfcf72
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48 changed files with 545 additions and 20 deletions
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13
models/issues/dependency.go
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@ -11,6 +11,7 @@ import (
"code.gitea.io/gitea/models/db"
user_model "code.gitea.io/gitea/models/user"
"code.gitea.io/gitea/modules/timeutil"
"code.gitea.io/gitea/modules/util"
)
// ErrDependencyExists represents a "DependencyAlreadyExists" kind of error.
@ -29,6 +30,10 @@ func (err ErrDependencyExists) Error() string {
return fmt.Sprintf("issue dependency does already exist [issue id: %d, dependency id: %d]", err.IssueID, err.DependencyID)
}
func (err ErrDependencyExists) Unwrap() error {
return util.ErrAlreadyExist
}
// ErrDependencyNotExists represents a "DependencyAlreadyExists" kind of error.
type ErrDependencyNotExists struct {
IssueID int64
@ -45,6 +50,10 @@ func (err ErrDependencyNotExists) Error() string {
return fmt.Sprintf("issue dependency does not exist [issue id: %d, dependency id: %d]", err.IssueID, err.DependencyID)
}
func (err ErrDependencyNotExists) Unwrap() error {
return util.ErrNotExist
}
// ErrCircularDependency represents a "DependencyCircular" kind of error.
type ErrCircularDependency struct {
IssueID int64
@ -91,6 +100,10 @@ func (err ErrUnknownDependencyType) Error() string {
return fmt.Sprintf("unknown dependency type [type: %d]", err.Type)
}
func (err ErrUnknownDependencyType) Unwrap() error {
return util.ErrInvalidArgument
}
// IssueDependency represents an issue dependency
type IssueDependency struct {
ID int64 `xorm:"pk autoincr"`