config.go

package telepathy

import (
	"fmt"
	"os"

	"github.com/spf13/viper"
)

// Constants for Environment variables
const (
	Name = "telepathy"
	Env  = "env"

	Environment    = "environment"
	EnvironmentVar = "TELEPATHY__ENVIRONMENT"

	PidFull = "pidfull"

	PidFile    = "pidfile"
	PidFileVar = "TELEPATHY__PIDFILE"

	PidPath    = "pidpath"
	PidPathVar = "TELEPATHY__PIDPATH"

	Local      = "local"
	Production = "production"
)

// ConfigReader represents configuration reader
type ConfigReader interface {
	Get(string) interface{}
	GetString(string) string
	GetInt(string) int
	GetBool(string) bool
	GetStringMap(string) map[string]interface{}
	GetStringMapString(string) map[string]string
	GetStringSlice(string) []string
	SetDefault(string, interface{})
}

// DefaultSettings is the function for configuring defaults
type DefaultSettings func(config ConfigReader)

// ConfigDefaults - returns the defauls of the config passed
func ConfigDefaults(config ConfigReader) {
	Defaults(config)
}

// Defaults is the default settings functor
func Defaults(config ConfigReader) {
	config.SetDefault(Environment, GetEnv(EnvironmentVar, Local))
	config.SetDefault(PidFile, GetEnv(PidFileVar, fmt.Sprintf("%s.pid", Name)))
	config.SetDefault(PidPath, GetEnv(PidPathVar, fmt.Sprintf("/var/run/%s", Name)))
}

// GetEnv - pull values or set defaults.
func GetEnv(key, fallback string) string {
	value := os.Getenv(key)

	if len(value) == 0 {
		return fallback
	}

	return value
}

// LoadConfig - returns configuration for a particular app
func LoadConfig(defaultSetup DefaultSettings) (ConfigReader, error) {
	config := viper.New()

	Defaults(config)

	// var e error
	//
	// if config.GetString(CoinbaseSecret) == "" || config.GetString(CoinbaseKey) == "" || config.GetString(CoinbasePhrase) == "" {
	// 	e = errors.New("missing or invalid CoinbaseSecret/CoinbaseKey/CoinbasePhrase")
	// } else {
	// 	e = nil
	// }

	return config, nil
}