mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-12-18 11:00:25 +00:00
129 lines
2.9 KiB
Go
129 lines
2.9 KiB
Go
/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package cephfs
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import (
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"encoding/json"
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"fmt"
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"io/ioutil"
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"os"
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"path"
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"strings"
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"sync"
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"github.com/golang/glog"
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)
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const (
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controllerCacheRoot = PluginFolder + "/controller/plugin-cache"
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)
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type controllerCacheEntry struct {
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VolOptions volumeOptions
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VolumeID volumeID
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}
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type controllerCacheMap map[volumeID]*controllerCacheEntry
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var (
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ctrCache = make(controllerCacheMap)
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ctrCacheMtx sync.Mutex
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)
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// Load all .json files from controllerCacheRoot into ctrCache
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// Called from driver.go's Run()
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func loadControllerCache() error {
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cacheDir, err := ioutil.ReadDir(controllerCacheRoot)
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if err != nil {
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return fmt.Errorf("cannot read controller cache from %s: %v", controllerCacheRoot, err)
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}
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ctrCacheMtx.Lock()
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defer ctrCacheMtx.Unlock()
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for _, fi := range cacheDir {
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if !strings.HasSuffix(fi.Name(), ".json") || !fi.Mode().IsRegular() {
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continue
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}
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f, err := os.Open(path.Join(controllerCacheRoot, fi.Name()))
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if err != nil {
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glog.Errorf("cephfs: cloudn't read '%s' from controller cache: %v", fi.Name(), err)
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continue
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}
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d := json.NewDecoder(f)
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ent := &controllerCacheEntry{}
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if err = d.Decode(ent); err != nil {
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glog.Errorf("cephfs: failed to parse '%s': %v", fi.Name(), err)
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} else {
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ctrCache[ent.VolumeID] = ent
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}
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f.Close()
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}
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return nil
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}
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func getControllerCacheEntryPath(volId volumeID) string {
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return path.Join(controllerCacheRoot, string(volId)+".json")
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}
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func (m controllerCacheMap) insert(ent *controllerCacheEntry) error {
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filePath := getControllerCacheEntryPath(ent.VolumeID)
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ctrCacheMtx.Lock()
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defer ctrCacheMtx.Unlock()
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f, err := os.Create(filePath)
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if err != nil {
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return fmt.Errorf("couldn't create cache entry file '%s': %v", filePath, err)
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}
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defer f.Close()
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enc := json.NewEncoder(f)
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if err = enc.Encode(ent); err != nil {
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return fmt.Errorf("failed to encode cache entry for volume %s: %v", ent.VolumeID, err)
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}
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m[ent.VolumeID] = ent
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return nil
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}
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func (m controllerCacheMap) pop(volId volumeID) (*controllerCacheEntry, error) {
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ctrCacheMtx.Lock()
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defer ctrCacheMtx.Unlock()
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ent, ok := m[volId]
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if !ok {
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return nil, fmt.Errorf("cache entry for volume %s does not exist", volId)
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}
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filePath := getControllerCacheEntryPath(volId)
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if err := os.Remove(filePath); err != nil {
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return nil, fmt.Errorf("failed to remove cache entry file '%s': %v", filePath, err)
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}
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delete(m, volId)
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return ent, nil
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}
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