forked from Silverfish/proton-bridge
f3c69faf8b
* Renaming GUI, CLI, no-impact config. * License header and documentation rebranding. * Rename app title and vendor. Impact: manual install * Migrating mac keychain and launch on startup. * Fix linter and linter renaming
51 lines
1.3 KiB
Go
51 lines
1.3 KiB
Go
// Copyright (c) 2022 Proton AG
|
|
//
|
|
// This file is part of Proton Mail Bridge.
|
|
//
|
|
// Proton Mail Bridge is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// Proton Mail Bridge 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 General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with Proton Mail Bridge. If not, see <https://www.gnu.org/licenses/>.
|
|
|
|
package updater
|
|
|
|
import (
|
|
"sync/atomic"
|
|
|
|
"github.com/pkg/errors"
|
|
)
|
|
|
|
var ErrOperationOngoing = errors.New("the operation is already ongoing")
|
|
|
|
// locker is an easy way to ensure we only perform one update at a time.
|
|
type locker struct {
|
|
ongoing atomic.Value
|
|
}
|
|
|
|
func newLocker() *locker {
|
|
l := &locker{}
|
|
|
|
l.ongoing.Store(false)
|
|
|
|
return l
|
|
}
|
|
|
|
func (l *locker) doOnce(fn func() error) error {
|
|
if l.ongoing.Load().(bool) { //nolint:forcetypeassert
|
|
return ErrOperationOngoing
|
|
}
|
|
|
|
l.ongoing.Store(true)
|
|
defer func() { l.ongoing.Store(false) }()
|
|
|
|
return fn()
|
|
}
|