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settings_db.go
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settings_db.go
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package libkbfs
import (
"os"
"path"
"strconv"
"github.com/keybase/client/go/kbfs/idutil"
"github.com/keybase/client/go/protocol/keybase1"
"github.com/pkg/errors"
"github.com/syndtr/goleveldb/leveldb/opt"
"github.com/syndtr/goleveldb/leveldb/storage"
"golang.org/x/net/context"
)
const (
// Where in config.StorageRoot() we store settings information.
settingsDBDir = "kbfs_settings"
settingsDBVersionString = "v1"
settingsDBName = "kbfsSettings.leveldb"
// Settings keys
spaceAvailableNotificationThresholdKey = "spaceAvailableNotificationThreshold"
)
// ErrNoSettingsDB is returned when there is no settings DB potentially due to
// multiple concurrent KBFS instances.
var ErrNoSettingsDB = errors.New("no settings DB")
var errNoSession = errors.New("no session")
type currentSessionGetter interface {
CurrentSessionGetter() idutil.CurrentSessionGetter
}
// SettingsDB stores KBFS user settings for a given device.
type SettingsDB struct {
*LevelDb
sessionGetter currentSessionGetter
cache map[string][]byte
}
func openSettingsDBInternal(config Config) (*LevelDb, error) {
if config.IsTestMode() {
return openLevelDB(storage.NewMemStorage(), config.Mode())
}
dbPath := path.Join(config.StorageRoot(), settingsDBDir,
settingsDBVersionString)
err := os.MkdirAll(dbPath, os.ModePerm)
if err != nil {
return nil, err
}
stor, err := storage.OpenFile(path.Join(dbPath, settingsDBName), false)
if err != nil {
return nil, err
}
return openLevelDB(stor, config.Mode())
}
func openSettingsDB(config Config) *SettingsDB {
db, err := openSettingsDBInternal(config)
if err != nil {
config.MakeLogger("SDB").CWarningf(context.Background(),
"Could not open settings DB. "+
"Perhaps multiple KBFS instances are being run concurrently"+
"? Error: %+v", err)
if db != nil {
db.Close()
}
return nil
}
return &SettingsDB{
LevelDb: db,
sessionGetter: config,
cache: make(map[string][]byte),
}
}
func (db *SettingsDB) getUID(ctx context.Context) keybase1.UID {
if db.sessionGetter == nil || db.sessionGetter.CurrentSessionGetter() == nil {
return keybase1.UID("")
}
si, err := db.sessionGetter.CurrentSessionGetter().GetCurrentSession(ctx)
if err != nil {
return keybase1.UID("")
}
return si.UID
}
func getSettingsDbKey(uid keybase1.UID, key string) []byte {
return append([]byte(uid), []byte(key)...)
}
// Get overrides (*LevelDb).Get to cache values in memory.
func (db *SettingsDB) Get(key []byte, ro *opt.ReadOptions) ([]byte, error) {
val, isCached := db.cache[string(key)]
if isCached {
return val, nil
}
val, err := db.LevelDb.Get(key, ro)
if err == nil {
db.cache[string(key)] = val
}
return val, err
}
// Put overrides (*LevelDb).Put to cache values in memory.
func (db *SettingsDB) Put(key []byte, val []byte, wo *opt.WriteOptions) error {
err := db.LevelDb.Put(key, val, wo)
if err != nil {
delete(db.cache, string(key))
} else {
db.cache[string(key)] = val
}
return err
}
// Settings returns the logged-in user's settings as a keybase1.FSSettings.
func (db *SettingsDB) Settings(ctx context.Context) (keybase1.FSSettings, error) {
uid := db.getUID(ctx)
if uid == keybase1.UID("") {
return keybase1.FSSettings{}, errNoSession
}
var notificationThreshold int64
notificationThresholdBytes, err :=
db.Get(getSettingsDbKey(uid, spaceAvailableNotificationThresholdKey), nil)
if err == nil {
notificationThreshold, _ =
strconv.ParseInt(string(notificationThresholdBytes), 10, 64)
}
// If we have an error we just pretend there's an empty setting.
return keybase1.FSSettings{
SpaceAvailableNotificationThreshold: notificationThreshold,
}, nil
}
// SetNotificationThreshold sets the notification threshold setting for the
// logged-in user.
func (db *SettingsDB) SetNotificationThreshold(
ctx context.Context, threshold int64) error {
uid := db.getUID(ctx)
if uid == keybase1.UID("") {
return errNoSession
}
return db.Put(getSettingsDbKey(uid, spaceAvailableNotificationThresholdKey),
[]byte(strconv.FormatInt(threshold, 10)), nil)
}