Created
May 22, 2020 17:09
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Collect and handle multiple errors in Go
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| package util | |
| import ( | |
| "errors" | |
| "strings" | |
| ) | |
| // Errs is an error that collects other errors, for when you want to do | |
| // several things and then report all of them. | |
| type Errs struct { | |
| errors []error | |
| } | |
| func (e *Errs) Add(err error) { | |
| if err != nil { | |
| e.errors = append(e.errors, err) | |
| } | |
| } | |
| func (e *Errs) Ret() error { | |
| if e == nil || e.IsEmpty() { | |
| return nil | |
| } | |
| return e | |
| } | |
| func (e *Errs) IsEmpty() bool { | |
| return e.Len() == 0 | |
| } | |
| func (e *Errs) Len() int { | |
| return len(e.errors) | |
| } | |
| func (e *Errs) Error() string { | |
| asStr := make([]string, len(e.errors)) | |
| for i, x := range e.errors { | |
| asStr[i] = x.Error() | |
| } | |
| return strings.Join(asStr, ". ") | |
| } | |
| func (e *Errs) Is(target error) bool { | |
| for _, candidate := range e.errors { | |
| if errors.Is(candidate, target) { | |
| return true | |
| } | |
| } | |
| return false | |
| } | |
| func (e *Errs) As(target interface{}) bool { | |
| for _, candidate := range e.errors { | |
| if errors.As(candidate, target) { | |
| return true | |
| } | |
| } | |
| return false | |
| } |
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