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local.go
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local.go
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// Copyright 2020 PingCAP, Inc.
//
// 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package store
import (
"os"
"path"
"time"
"github.com/gofrs/flock"
"github.com/pingcap/errors"
"github.com/pingcap/tiup/pkg/utils"
)
type localStore struct {
root string
upstream string
flock *flock.Flock
}
func newLocalStore(root, upstream string) *localStore {
return &localStore{
root: root,
upstream: upstream,
flock: flock.New(path.Join(root, "lock")),
}
}
// Begin implements the Store
func (s *localStore) Begin() (FsTxn, error) {
return newLocalTxn(s)
}
// Returns the last modify time
func (s *localStore) last(filename string) (*time.Time, error) {
fp := path.Join(s.root, filename)
if utils.IsNotExist(fp) {
return nil, nil
}
fi, err := os.Stat(fp)
if err != nil {
return nil, errors.Annotate(err, "Stat file")
}
mt := fi.ModTime()
return &mt, nil
}
func (s *localStore) path(filename string) string {
return path.Join(s.root, filename)
}
func (s *localStore) lock() error {
return s.flock.Lock()
}
func (s *localStore) unlock() {
// The unlock operation must success, otherwise the later operation will stuck
if err := s.flock.Unlock(); err != nil {
panic(errors.Annotate(err, "unlock filesystem failed"))
}
}