mirror of https://github.com/goharbor/harbor.git
63 lines
1.3 KiB
Go
63 lines
1.3 KiB
Go
/*
|
|
Copyright The containerd Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package local
|
|
|
|
import (
|
|
"fmt"
|
|
"sync"
|
|
"time"
|
|
|
|
"github.com/containerd/containerd/errdefs"
|
|
)
|
|
|
|
// Handles locking references
|
|
|
|
type lock struct {
|
|
since time.Time
|
|
}
|
|
|
|
var (
|
|
// locks lets us lock in process
|
|
locks = make(map[string]*lock)
|
|
locksMu sync.Mutex
|
|
)
|
|
|
|
func tryLock(ref string) error {
|
|
locksMu.Lock()
|
|
defer locksMu.Unlock()
|
|
|
|
if v, ok := locks[ref]; ok {
|
|
// Returning the duration may help developers distinguish dead locks (long duration) from
|
|
// lock contentions (short duration).
|
|
now := time.Now()
|
|
return fmt.Errorf(
|
|
"ref %s locked for %s (since %s): %w", ref, now.Sub(v.since), v.since,
|
|
errdefs.ErrUnavailable,
|
|
)
|
|
}
|
|
|
|
locks[ref] = &lock{time.Now()}
|
|
return nil
|
|
}
|
|
|
|
func unlock(ref string) {
|
|
locksMu.Lock()
|
|
defer locksMu.Unlock()
|
|
|
|
delete(locks, ref)
|
|
}
|