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101 lines
2.4 KiB
Go
101 lines
2.4 KiB
Go
// Copyright (c) 2015-2021 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package env
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import (
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"strconv"
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"strings"
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"sync"
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)
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var (
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privateMutex sync.RWMutex
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lockEnvMutex sync.Mutex
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envOff bool
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)
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// LockSetEnv locks modifications to environment.
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// Call returned function to unlock.
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func LockSetEnv() func() {
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lockEnvMutex.Lock()
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return lockEnvMutex.Unlock
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}
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// SetEnvOff - turns off env lookup
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// A global lock above this MUST ensure that
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func SetEnvOff() {
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privateMutex.Lock()
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defer privateMutex.Unlock()
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envOff = true
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}
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// SetEnvOn - turns on env lookup
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func SetEnvOn() {
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privateMutex.Lock()
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defer privateMutex.Unlock()
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envOff = false
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}
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// IsSet returns if the given env key is set.
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func IsSet(key string) bool {
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_, _, _, ok := LookupEnv(key)
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return ok
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}
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// Get retrieves the value of the environment variable named
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// by the key. If the variable is present in the environment the
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// value (which may be empty) is returned. Otherwise it returns
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// the specified default value.
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func Get(key, defaultValue string) string {
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privateMutex.RLock()
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ok := envOff
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privateMutex.RUnlock()
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if ok {
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return defaultValue
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}
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if v, _, _, ok := LookupEnv(key); ok {
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return v
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}
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return defaultValue
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}
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// GetInt returns an integer if found in the environment
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// and returns the default value otherwise.
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func GetInt(key string, defaultValue int) (int, error) {
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v := Get(key, "")
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if v == "" {
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return defaultValue, nil
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}
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return strconv.Atoi(v)
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}
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// List all envs with a given prefix.
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func List(prefix string) (envs []string) {
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for _, env := range Environ() {
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if strings.HasPrefix(env, prefix) {
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values := strings.SplitN(env, "=", 2)
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if len(values) == 2 {
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envs = append(envs, values[0])
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}
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}
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}
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return envs
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}
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