/
fileconfig.go
99 lines (80 loc) · 2.4 KB
/
fileconfig.go
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// SPDX-License-Identifier: Apache-2.0
//
// Copyright (C) 2021 Renesas Electronics Corporation.
// Copyright (C) 2021 EPAM Systems, 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,
// 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 firewall
import (
"encoding/json"
"fmt"
"os"
"path/filepath"
"github.com/containernetworking/plugins/plugins/ipam/host-local/backend/disk"
)
/*******************************************************************************
* Types
******************************************************************************/
// the disk lock for inter-process guard
type fileConfig struct {
lock *disk.FileLock
path string
}
/*******************************************************************************
* Public
******************************************************************************/
func newFileConfig(path string) (f *fileConfig, err error) {
f = &fileConfig{path: path}
if err = os.MkdirAll(filepath.Dir(path), 0o600); err != nil {
return nil, err
}
if _, err = os.Stat(path); err != nil && !os.IsNotExist(err) {
return nil, err
}
if os.IsNotExist(err) {
if _, err = os.Create(path); err != nil {
return nil, fmt.Errorf("failed to create file %s", err)
}
}
if f.lock, err = disk.NewFileLock(path); err != nil {
return nil, err
}
return f, nil
}
func (f *fileConfig) Lock() (err error) {
return f.lock.Lock()
}
func (f *fileConfig) Unlock() (err error) {
return f.lock.Unlock()
}
func (f *fileConfig) Load(v interface{}) (err error) {
configJSON, err := os.ReadFile(f.path)
if err != nil {
return err
}
if len(configJSON) == 0 {
return nil
}
return json.Unmarshal(configJSON, &v)
}
func (f *fileConfig) Save(v interface{}) (err error) {
conf, err := json.MarshalIndent(v, "", " ")
if err != nil {
return fmt.Errorf("failed to serialize config %s", err)
}
err = os.WriteFile(f.path, conf, 0o644)
if err != nil {
return fmt.Errorf("failed to write config %s", err)
}
return nil
}