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cache.go
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cache.go
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// Copyright (c) 2021 Red Hat, Inc.
// Copyright (c) 2021 CNI authors
// Copyright (c) 2021 Nordix Foundation.
//
// 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 utils
import (
"encoding/json"
"fmt"
"io/ioutil"
"os"
"path/filepath"
)
var (
// DefaultCacheDir used for caching
DefaultCacheDir = "/tmp/ovscache"
)
// SaveCache takes in key as string and a json encoded struct Conf and save this Conf in cache dir
func SaveCache(key string, conf interface{}) error {
confBytes, err := json.Marshal(conf)
if err != nil {
return fmt.Errorf("error serializing delegate conf: %v", err)
}
// save the rendered conf for cmdDel
if err = os.MkdirAll(DefaultCacheDir, 0700); err != nil {
return fmt.Errorf("failed to create the sriov data directory(%q): %v", DefaultCacheDir, err)
}
path := getKeyPath(key)
err = ioutil.WriteFile(path, confBytes, 0600)
if err != nil {
return fmt.Errorf("failed to write container data in the path(%q): %v", path, err)
}
return nil
}
// ReadCache read cached conf from disk for the given key and returns data in byte array
func ReadCache(key string) ([]byte, error) {
path := getKeyPath(key)
data, err := ioutil.ReadFile(path)
if err != nil {
return nil, fmt.Errorf("failed to read container data in the path(%q): %v", path, err)
}
return data, err
}
// CleanCache removes cached conf from disk for the given key
func CleanCache(key string) error {
path := getKeyPath(key)
if err := os.Remove(path); err != nil {
return fmt.Errorf("error removing Conf file %s: %q", path, err)
}
return nil
}
func getKeyPath(key string) string {
return filepath.Join(DefaultCacheDir, key)
}