Search code, repositories, users, issues, pull requests...
koanf is a library for reading configuration from different sources in different formats in Go applications. It is a cleaner, lighter alternative to spf13/viper with better abstractions and extensibility and far fewer dependencies.
koanf v2 has modules (Providers) for reading configuration from a variety of sources such as files, command line flags, environment variables, Vault, and S3 and for parsing (Parsers) formats such as JSON, YAML, TOML, Hashicorp HCL. It is easy to plug in custom parsers and providers.
With these two interface implementations, koanf can obtain configuration in any format from any source, parse it, and make it available to an application.
Some providers expose a Watch() method that makes the provider watch for changes in configuration and trigger a callback to reload the configuration. This is not goroutine safe if there are concurrent *Get() calls happening on the koanf object while it is doing a Load(). Such scenarios will need mutex locking.
The following example shows the use of posflag.Provider, a wrapper over the spf13/pflag library, an advanced commandline lib. For Go's built in flag package, use basicflag.Provider.
