env/env.go

/*
Copyright 2015 The Kubernetes Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package env

import (
	"os"
	"strconv"
)

// GetString returns the env variable for the given key
// and falls back to the given defaultValue if not set
func GetString(key, defaultValue string) string {
	v, ok := os.LookupEnv(key)
	if ok {
		return v
	}
	return defaultValue
}

// GetInt returns the env variable (parsed as integer) for
// the given key and falls back to the given defaultValue if not set
func GetInt(key string, defaultValue int) (int, error) {
	v, ok := os.LookupEnv(key)
	if ok {
		value, err := strconv.Atoi(v)
		if err != nil {
			return defaultValue, err
		}
		return value, nil
	}
	return defaultValue, nil
}

// GetFloat64 returns the env variable (parsed as float64) for
// the given key and falls back to the given defaultValue if not set
func GetFloat64(key string, defaultValue float64) (float64, error) {
	v, ok := os.LookupEnv(key)
	if ok {
		value, err := strconv.ParseFloat(v, 64)
		if err != nil {
			return defaultValue, err
		}
		return value, nil
	}
	return defaultValue, nil
}

// GetBool returns the env variable (parsed as bool) for
// the given key and falls back to the given defaultValue if not set
func GetBool(key string, defaultValue bool) (bool, error) {
	v, ok := os.LookupEnv(key)
	if ok {
		value, err := strconv.ParseBool(v)
		if err != nil {
			return defaultValue, err
		}
		return value, nil
	}
	return defaultValue, nil
}