mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-12-29 16:30:19 +00:00
125 lines
3.5 KiB
Go
125 lines
3.5 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 util
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import (
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"encoding/json"
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"io/ioutil"
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"os"
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"path"
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"path/filepath"
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"regexp"
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"strings"
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"github.com/golang/glog"
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"github.com/pkg/errors"
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)
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type NodeCache struct {
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BasePath string
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}
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var cacheDir = "controller"
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func (nc *NodeCache) EnsureCacheDirectory(cacheDir string) error {
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fullPath := path.Join(nc.BasePath, cacheDir)
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if _, err := os.Stat(fullPath); os.IsNotExist(err) {
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if err := os.Mkdir(fullPath, 0755); err != nil {
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return errors.Wrapf(err, "node-cache: failed to create %s folder with error: %v", fullPath, err)
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}
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}
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return nil
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}
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func (nc *NodeCache) ForAll(pattern string, destObj interface{}, f ForAllFunc) error {
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err := nc.EnsureCacheDirectory(cacheDir)
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if err != nil {
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return errors.Wrap(err, "node-cache: couldn't ensure cache directory exists")
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}
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files, err := ioutil.ReadDir(path.Join(nc.BasePath, cacheDir))
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if err != nil {
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return errors.Wrapf(err, "node-cache: failed to read %s folder", nc.BasePath)
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}
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for _, file := range files {
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match, err := regexp.MatchString(pattern, file.Name())
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if err != nil || !match {
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continue
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}
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if !strings.HasSuffix(file.Name(), ".json") {
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continue
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}
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fp, err := os.Open(path.Join(nc.BasePath, cacheDir, file.Name()))
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if err != nil {
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glog.Infof("node-cache: open file: %s err %v", file.Name(), err)
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continue
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}
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decoder := json.NewDecoder(fp)
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if err = decoder.Decode(destObj); err != nil {
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fp.Close()
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return errors.Wrapf(err, "node-cache: couldn't decode file %s", file.Name())
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}
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if err := f(strings.TrimSuffix(file.Name(), filepath.Ext(file.Name()))); err != nil {
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return err
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}
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}
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return nil
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}
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func (nc *NodeCache) Create(identifier string, data interface{}) error {
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file := path.Join(nc.BasePath, cacheDir, identifier+".json")
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fp, err := os.Create(file)
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if err != nil {
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return errors.Wrapf(err, "node-cache: failed to create metadata storage file %s\n", file)
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}
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defer fp.Close()
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encoder := json.NewEncoder(fp)
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if err = encoder.Encode(data); err != nil {
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return errors.Wrapf(err, "node-cache: failed to encode metadata for file: %s\n", file)
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}
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glog.V(4).Infof("node-cache: successfully saved metadata into file: %s\n", file)
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return nil
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}
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func (nc *NodeCache) Get(identifier string, data interface{}) error {
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file := path.Join(nc.BasePath, cacheDir, identifier+".json")
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fp, err := os.Open(file)
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if err != nil {
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return errors.Wrapf(err, "node-cache: open error for %s", file)
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}
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defer fp.Close()
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decoder := json.NewDecoder(fp)
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if err = decoder.Decode(data); err != nil {
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return errors.Wrap(err, "rbd: decode error")
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}
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return nil
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}
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func (nc *NodeCache) Delete(identifier string) error {
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file := path.Join(nc.BasePath, cacheDir, identifier+".json")
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err := os.Remove(file)
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if err != nil {
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if err != os.ErrNotExist {
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return errors.Wrapf(err, "node-cache: error removing file %s", file)
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}
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}
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glog.V(4).Infof("node-cache: successfully deleted metadata storage file at: %+v\n", file)
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return nil
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}
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