dynconfig

Load / write config from different providers and get notified if it changes

Install

go get github.com/davidterranova/dynconfig/...

Example

export MY_APP_PORT=80

type Config struct {
  Host string `envconfig:"HOST" default:"0.0.0.0"`
  Port int    `envconfig:"PORT" default:"8080"`
}

var config = Config{}
// read from environment variables
envAdaptor := adaptors.NewEnvConfigAdaptor("MY_APP")
// read / write config from / to yaml file
yamlAdaptor := adaptors.NewYAMLFileAdatptor("/etc/my_app/config.yaml")
// will check for changes and update config accordingly
fileWatcher := adaptors.NewFileWatcherAdaptor(
  "/etc/my_app/config.yaml",
  yamlAdaptor,
)

// create the operator
operator := dynconfig.NewOperator(
  &config,
  dynconfig.WithConfigReader(envAdaptor),
  dynconfig.WithConfigReader(yamlAdaptor),
  dynconfig.WithConfigWriter(yamlAdaptor),
  dynconfig.WithConfigNotifier(fileWatcher),
)

// get configuration & starts watchers
if err := operator.Process(context.Background()); err != nil {
  log.Fatal(err)
}

log.Printf("%+v", config)