mirror of
https://github.com/cgrates/cgrates.git
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97 lines
2.4 KiB
Go
97 lines
2.4 KiB
Go
/*
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Real-time Online/Offline Charging System (OCS) for Telecom & ISP environments
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Copyright (C) ITsysCOM GmbH
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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 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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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 General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>
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*/
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package loaders
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import (
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"io"
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"os"
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"github.com/cgrates/cgrates/guardian"
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"github.com/cgrates/cgrates/utils"
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)
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type Locker interface {
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Lock() error
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Unlock() error
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Locked() (bool, error)
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IsLockFile(string) bool
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}
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func newLocker(path, loaderID string) Locker {
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switch path {
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case utils.EmptyString:
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return new(nopLock)
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case utils.MetaMemory:
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return &memoryLock{loaderID: loaderID}
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default:
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return folderLock(path)
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}
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}
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type folderLock string
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// lockFolder will attempt to lock the folder by creating the lock file
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func (fl folderLock) Lock() (err error) {
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var file io.Closer
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file, err = os.OpenFile(string(fl),
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os.O_RDONLY|os.O_CREATE, 0644)
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file.Close()
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return
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}
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func (fl folderLock) Unlock() (err error) {
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return os.Remove(string(fl))
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}
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func (fl folderLock) Locked() (lk bool, err error) {
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if _, err = os.Stat(string(fl)); err != nil {
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if os.IsNotExist(err) {
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lk, err = false, nil
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}
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return
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}
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lk = true
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return
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}
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func (fl folderLock) IsLockFile(path string) bool { return path == string(fl) }
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type nopLock struct{}
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func (nopLock) Lock() (_ error) { return }
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func (nopLock) Unlock() (_ error) { return }
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func (nopLock) Locked() (_ bool, _ error) { return }
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func (nopLock) IsLockFile(string) (_ bool) { return }
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type memoryLock struct {
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loaderID string
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refID string
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}
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func (m *memoryLock) Lock() (_ error) {
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m.refID = guardian.Guardian.GuardIDs(m.refID, 0, utils.ConcatenatedKey(utils.LoaderS, m.loaderID))
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return
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}
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func (m *memoryLock) Unlock() (_ error) {
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guardian.Guardian.UnguardIDs(m.refID)
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m.refID = utils.EmptyString
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return
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}
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func (m memoryLock) Locked() (bool, error) { return len(m.refID) != 0, nil }
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func (m memoryLock) IsLockFile(string) (_ bool) { return }
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