bottin-ag/config/config.go

/*
Package config provides types and methods for managing this application's
config options and flags
*/
package config

import (
	"github.com/spf13/cobra"
	"github.com/spf13/viper"
)

type Config struct {
	API    APIConfig
	Bottin BottinConfig
	Web    WebConfig
}

type APIConfig struct {
	Port int
}

type BottinConfig struct {
	API struct {
		Host string
	}
}

type WebConfig struct {
	Port int
}

func UnmarshalConfig() (cfg Config, err error) {
	return cfg, viper.Unmarshal(&cfg)
}

// RegisterInt registers a new cobra int flag and associated viper config option
func RegisterInt(cmd *cobra.Command, isPersistent bool, viperName, cobraName, cobraDescription string, cobraDefault int) error {
	if isPersistent {
		cmd.PersistentFlags().Int(cobraName, cobraDefault, cobraDescription)
		return viper.BindPFlag(viperName, cmd.PersistentFlags().Lookup(cobraName))
	} else {
		cmd.Flags().Int(cobraName, cobraDefault, cobraDescription)
		return viper.BindPFlag(viperName, cmd.Flags().Lookup(cobraName))
	}
}

// RegisterString registers a new cobra string flag and associated viper config option
func RegisterString(cmd *cobra.Command, isPersistent bool, viperName, cobraName, cobraDescription string, cobraDefault string) error {
	if isPersistent {
		cmd.PersistentFlags().String(cobraName, cobraDefault, cobraDescription)
		return viper.BindPFlag(viperName, cmd.PersistentFlags().Lookup(cobraName))
	} else {
		cmd.Flags().String(cobraName, cobraDefault, cobraDescription)
		return viper.BindPFlag(viperName, cmd.Flags().Lookup(cobraName))
	}
}

// RegisterFlags adds persistent flags necessary to the application to the specified *cobra.Command
func RegisterFlags(cmd *cobra.Command) error {
	// api.port ; --api-port
	cmd.PersistentFlags().Int("api-port", 3182, "API server port")
	if err := viper.BindPFlag("api.port", cmd.PersistentFlags().Lookup("api-port")); err != nil {
		return err
	}

	// bottin.api.host
	if err := RegisterString(cmd, true,
		"bottin.api.host", "bottin-api-host", "Bottin API server host", "localhost"); err != nil {
		return err
	}

	// web.port ; --web-port
	cmd.PersistentFlags().Int("web-port", 3183, "Webserver port")
	if err := viper.BindPFlag("web.port", cmd.PersistentFlags().Lookup("web-port")); err != nil {
		return err
	}

	return nil
}