mirror of
https://github.com/NVIDIA/nvidia-container-toolkit
synced 2024-11-24 13:05:17 +00:00
89 lines
1.6 KiB
Markdown
89 lines
1.6 KiB
Markdown
errutil
|
|
=======
|
|
|
|
An error handling helper, providing more APIs than built-in package (errors, fmt), and compatible with go error interface
|
|
|
|
## Why use errutil instead of built-in errors and fmt
|
|
|
|
[](https://milkr.io/tsaikd/Go-lang-error-handling)
|
|
|
|
* https://milkr.io/tsaikd/Go-lang-error-handling
|
|
|
|
## Usage
|
|
|
|
* Import package from master branch
|
|
|
|
```
|
|
import "github.com/tsaikd/KDGoLib/errutil"
|
|
```
|
|
|
|
* Declare error factory
|
|
|
|
```
|
|
var ErrorOccurWithReason = errutil.NewFactory("An error occur, reason: %q")
|
|
```
|
|
|
|
* Return error with factory
|
|
|
|
```
|
|
func doSomething() (err error) {
|
|
// do something
|
|
|
|
// return error with factory,
|
|
// first argument is parent error,
|
|
// the others are used for factory
|
|
return ErrorOccurWithReason.New(nil, "some reason here")
|
|
}
|
|
```
|
|
|
|
* Handle errors
|
|
|
|
```
|
|
func errorHandlingForOneCase() {
|
|
if err := doSomething(); err != nil {
|
|
if ErrorOccurWithReason.In(err) {
|
|
// handling expected error
|
|
return
|
|
}
|
|
|
|
// handling unexpected error
|
|
return
|
|
}
|
|
}
|
|
```
|
|
|
|
```
|
|
func errorHandlingForMultipleCases() {
|
|
if err := doSomething(); err != nil {
|
|
switch errutil.FactoryOf(err) {
|
|
case ErrorOccurWithReason:
|
|
// handling expected error
|
|
return
|
|
default:
|
|
// handling unexpected error
|
|
return
|
|
}
|
|
}
|
|
}
|
|
```
|
|
|
|
## Optional usage
|
|
|
|
* Import from v1 branch
|
|
|
|
```
|
|
import "gopkg.in/tsaikd/KDGoLib.v1/errutil"
|
|
```
|
|
|
|
* Use like built-in errors package
|
|
* bad case because all errors should be exported for catching by other package
|
|
|
|
```
|
|
func doSomething() (err error) {
|
|
// do something
|
|
|
|
// return error with factory
|
|
return errutil.New("An error occur")
|
|
}
|
|
```
|