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fbc9f8e640
The package env makes it trivial to work with environment variables. It allows getting values with defaults as a fallback. New ENV variables can be set safely on the current process environment.
90 lines
2.2 KiB
Go
90 lines
2.2 KiB
Go
// Copyright 2014 beego Author. All Rights Reserved.
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// Copyright 2017 Faissal Elamraoui. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package env
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import (
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"fmt"
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"os"
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"strings"
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"sync"
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)
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var env struct {
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data map[string]string
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lock *sync.RWMutex
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}
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func init() {
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env.data = make(map[string]string)
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env.lock = &sync.RWMutex{}
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for _, e := range os.Environ() {
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splits := strings.Split(e, "=")
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env.data[splits[0]] = os.Getenv(splits[0])
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}
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}
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// Get returns a value by key.
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// If the key does not exist, the default value will be returned.
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func Get(key string, defVal string) string {
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env.lock.RLock()
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defer env.lock.RUnlock()
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if val, ok := env.data[key]; ok {
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return val
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}
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return defVal
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}
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// MustGet returns a value by key.
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// If the key does not exist, it will return an error.
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func MustGet(key string) (string, error) {
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env.lock.RLock()
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defer env.lock.RUnlock()
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if val, ok := env.data[key]; ok {
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return val, nil
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}
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return "", fmt.Errorf("no env variable with %s", key)
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}
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// Set sets a value in the ENV copy.
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// This does not affect the child process environment.
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func Set(key string, value string) {
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env.lock.Lock()
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defer env.lock.Unlock()
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env.data[key] = value
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}
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// MustSet sets a value in the ENV copy and the child process environment.
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// It returns an error in case the set operation failed.
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func MustSet(key string, value string) error {
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env.lock.Lock()
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defer env.lock.Unlock()
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err := os.Setenv(key, value)
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if err != nil {
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return err
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}
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env.data[key] = value
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return nil
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}
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// GetAll returns all keys/values in the current child process environment.
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func GetAll() map[string]string {
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env.lock.RLock()
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defer env.lock.RUnlock()
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return env.data
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}
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