Blunder

What is Blunder?

Blunder is a simple, gpt-based and easy-to-use error handling package for golang. It generate typed errors and manage them in centralized way, which reduce the dependency between packages and make error handling more convenient.

Getting Started

1. Install package

    go get github.com/DenChenn/blunder

2. Import into your project

   printf '// +build tools\npackage tools\nimport (_ "github.com/DenChenn/blunder")' | gofmt > tools.go
   
   go mod tidy

3. Initialize Blunder

    go run github.com/DenChenn/blunder init <your_dir_path>

4. Define your error in blunder.yaml according to example ❤️
5. Generate all errors

    go run github.com/DenChenn/blunder gen

   or generate with gpt-based auto-completion

    export OPENAI_API_TOKEN=<your_openai_api_token>
    go run github.com/DenChenn/blunder gen --complete=true 

Usage

Suppose your errors in blunder.yaml are defined like this:

details:
- package: alayer
  errors:
    - code: Err1
      #...
    - code: Err2
      #...
    - code: Err3
      #...
- package: blayer
  errors:
    - code: Err1
      #...
    - code: Err2
      #...
    - code: Err3
      #...

Your error will be generated in given path like this:

<your_dir_path>/errors/
generated/
  alayer/ 
    errors.go
  blayer/
    errors.go
blunder.yaml

Which can be import into your code like this:

if err != nil {
  if errors.Is(err, &alayer.Err1) {
    //...
  }
}

Or you can wrap your error like this:

if errors.Is(err, &pgx.ErrNoRows) {
  return &alayer.Err1.Wrap(err) 
}

Type assertion

All generated errors implement blunder.OrdinaryError interface, which contains static methods.

ordinaryError, ok := err.(blunder.OrdinaryError)
if ok {
	fmt.Println(ordinaryError.GetMessage())
}