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Programming language: Go
Tags: Configuration    
Latest version: v0.7.1

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README

aconfig

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Simple, useful and opinionated config loader.

Rationale

There are more than 2000 repositories on Github regarding configuration in Go. I was looking for a simple configuration loader that will automate a lot of things for me. Idea was to load config from 4 common places: defaults (in the code), config files, environment variables, command-line flags. This library works with all of them.

Features

  • Simple API.
  • Automates a lot of things.
    • config params names
    • config loading
    • generates documentation
  • Opinionated.
  • Supports different sources:
    • defaults in code
    • files (JSON, YAML, TOML)
    • environment variables
    • command-line flags
  • Dependency-free (except file parsers).
  • Walk over configuration fields.

Install

Go version 1.14+

go get github.com/cristalhq/aconfig

Example

type MyConfig struct {
    Port int `default:"1111" usage:"just give a number"`
    Auth struct {
        User string `default:"def-user"`
        Pass string `default:"def-pass"`
    }
    Pass string `default:"" env:"SECRET" flag:"sec_ret"`
}

var cfg MyConfig
loader := aconfig.LoaderFor(&cfg).
    // feel free to skip some steps :)
    // SkipDefaults().
    // SkipFiles().
    // SkipEnvironment().
    // SkipFlags().
    WithFiles([]string{"file.json", "ouch.yaml"}).
    WithEnvPrefix("APP").
    WithFlagPrefix("app").
    Build()

flagSet := loader.Flags() // Important: use exactly this flags to define your own

if err := loader.Load(); err != nil {
    panic(err)
}

// configuration fields will be loaded from (in order):
//
// 1. defaults set in structure tags (see structure defenition)
// 2. loaded from files `file.json` if not `ouch.yaml` will be used
// 3. from corresponding environment variables with the prefix `APP_`
// 4. command-line flags with the prefix `app.` if they are

Also see examples: examples_test.go.

Integration with spf13/cobra playground.

Documentation

See here: pkg.go.dev.

License

[MIT License](LICENSE).


*Note that all licence references and agreements mentioned in the aconfig README section above are relevant to that project's source code only.