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