/
kvs.go
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/
kvs.go
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// Copyright (c) 2022 Proton AG
//
// This file is part of Proton Mail Bridge.
//
// Proton Mail Bridge is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Proton Mail Bridge is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Proton Mail Bridge. If not, see <https://www.gnu.org/licenses/>.
package settings
import (
"encoding/json"
"errors"
"fmt"
"os"
"strconv"
"sync"
"github.com/sirupsen/logrus"
)
type keyValueStore struct {
vals map[Key]string
path string
lock *sync.RWMutex
}
// newKeyValueStore returns loaded preferences.
func newKeyValueStore(path string) *keyValueStore {
p := &keyValueStore{
path: path,
lock: &sync.RWMutex{},
}
if err := p.load(); err != nil {
logrus.WithError(err).Warn("Cannot load preferences file, creating new one")
}
return p
}
func (p *keyValueStore) load() error {
if p.vals != nil {
return nil
}
p.lock.Lock()
defer p.lock.Unlock()
p.vals = make(map[Key]string)
f, err := os.Open(p.path)
if err != nil {
return err
}
defer f.Close() //nolint:errcheck,gosec
return json.NewDecoder(f).Decode(&p.vals)
}
func (p *keyValueStore) save() error {
if p.vals == nil {
return errors.New("cannot save preferences: cache is nil")
}
p.lock.Lock()
defer p.lock.Unlock()
b, err := json.MarshalIndent(p.vals, "", "\t")
if err != nil {
return err
}
return os.WriteFile(p.path, b, 0o600)
}
func (p *keyValueStore) setDefault(key Key, value string) {
if p.Get(key) == "" {
p.Set(key, value)
}
}
func (p *keyValueStore) Get(key Key) string {
p.lock.RLock()
defer p.lock.RUnlock()
return p.vals[key]
}
func (p *keyValueStore) GetBool(key Key) bool {
return p.Get(key) == "true"
}
func (p *keyValueStore) GetInt(key Key) int {
if p.Get(key) == "" {
return 0
}
value, err := strconv.Atoi(p.Get(key))
if err != nil {
logrus.WithError(err).Error("Cannot parse int")
}
return value
}
func (p *keyValueStore) GetFloat64(key Key) float64 {
if p.Get(key) == "" {
return 0
}
value, err := strconv.ParseFloat(p.Get(key), 64)
if err != nil {
logrus.WithError(err).Error("Cannot parse float64")
}
return value
}
func (p *keyValueStore) Set(key Key, value string) {
p.lock.Lock()
p.vals[key] = value
p.lock.Unlock()
if err := p.save(); err != nil {
logrus.WithError(err).Warn("Cannot save preferences")
}
}
func (p *keyValueStore) SetBool(key Key, value bool) {
if value {
p.Set(key, "true")
} else {
p.Set(key, "false")
}
}
func (p *keyValueStore) SetInt(key Key, value int) {
p.Set(key, strconv.Itoa(value))
}
func (p *keyValueStore) SetFloat64(key Key, value float64) {
p.Set(key, fmt.Sprintf("%v", value))
}