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/*
* Copyright 2014 Canonical Ltd.
*
* Authors:
* Sergio Schvezov: sergio.schvezov@cannical.com
*
* This file is part of telepathy.
*
* mms 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; version 3.
*
* mms 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
package storage
import (
"bufio"
"encoding/json"
"errors"
"os"
"path/filepath"
"sync"
"log"
"launchpad.net/go-dbus/v1"
"launchpad.net/go-xdg/v0"
)
var preferredContextPath string = filepath.Join(filepath.Base(os.Args[0]), "preferredContext")
var contextMutex sync.Mutex
type contextSettingMap map[string]dbus.ObjectPath
func SetPreferredContext(identity string, pcObjectPath dbus.ObjectPath) error {
contextMutex.Lock()
defer contextMutex.Unlock()
pcFilePath, err := xdg.Cache.Ensure(preferredContextPath)
if err != nil {
return err
}
return writeContext(identity, pcObjectPath, pcFilePath)
}
func GetPreferredContext(identity string) (pcObjectPath dbus.ObjectPath, err error) {
contextMutex.Lock()
defer contextMutex.Unlock()
pcFilePath, err := xdg.Cache.Find(preferredContextPath)
if err != nil {
return pcObjectPath, err
}
cs, err := readContext(pcFilePath)
if err != nil {
return pcObjectPath, err
}
if p, ok := cs[identity]; ok {
return p, nil
}
return pcObjectPath, errors.New("path for identity not found")
}
func readContext(storePath string) (cs contextSettingMap, err error) {
file, err := os.Open(storePath)
if err != nil {
cs = make(contextSettingMap)
return cs, err
}
jsonReader := json.NewDecoder(file)
if err = jsonReader.Decode(&cs); err != nil {
cs = make(contextSettingMap)
}
return cs, err
}
func writeContext(identity string, pc dbus.ObjectPath, storePath string) error {
cs, readErr := readContext(storePath)
if readErr != nil {
log.Println("Cannot read previous context state")
}
file, err := os.Create(storePath)
if err != nil {
log.Println(err)
return err
}
defer func() {
file.Close()
if err != nil {
os.Remove(storePath)
}
}()
w := bufio.NewWriter(file)
defer w.Flush()
cs[identity] = pc
jsonWriter := json.NewEncoder(w)
if err := jsonWriter.Encode(cs); err != nil {
log.Println(err)
return err
}
return nil
}
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