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