blob: 77d1c05c768ebd517bf595472263ad858eae629d [file] [log] [blame]
// Copyright (C) 2016 The Android Open Source Project
//
// 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.
(function() {
'use strict';
// Date cutoff is one day:
var DRAFT_MAX_AGE = 24 * 60 * 60 * 1000;
// Clean up old entries no more frequently than one day.
var CLEANUP_THROTTLE_INTERVAL = 24 * 60 * 60 * 1000;
Polymer({
is: 'gr-storage',
properties: {
_lastCleanup: Number,
_storage: {
type: Object,
value: function() {
return window.localStorage;
},
},
_exceededQuota: {
type: Boolean,
value: false,
},
},
getDraftComment: function(location) {
this._cleanupDrafts();
return this._getObject(this._getDraftKey(location));
},
setDraftComment: function(location, message) {
var key = this._getDraftKey(location);
this._setObject(key, {message: message, updated: Date.now()});
},
eraseDraftComment: function(location) {
var key = this._getDraftKey(location);
this._storage.removeItem(key);
},
getPreferences: function() {
return this._getObject('localPrefs');
},
savePreferences: function(localPrefs) {
this._setObject('localPrefs', localPrefs || null);
},
_getDraftKey: function(location) {
var range = location.range ? location.range.start_line + '-' +
location.range.start_character + '-' + location.range.end_character +
'-' + location.range.end_line : null;
var key = ['draft', location.changeNum, location.patchNum, location.path,
location.line || ''].join(':');
if (range) {
key = key + ':' + range;
}
return key;
},
_cleanupDrafts: function() {
// Throttle cleanup to the throttle interval.
if (this._lastCleanup &&
Date.now() - this._lastCleanup < CLEANUP_THROTTLE_INTERVAL) {
return;
}
this._lastCleanup = Date.now();
var draft;
for (var key in this._storage) {
if (key.indexOf('draft:') === 0) {
draft = this._getObject(key);
if (Date.now() - draft.updated > DRAFT_MAX_AGE) {
this._storage.removeItem(key);
}
}
}
},
_getObject: function(key) {
var serial = this._storage.getItem(key);
if (!serial) { return null; }
return JSON.parse(serial);
},
_setObject: function(key, obj) {
if (this._exceededQuota) { return; }
try {
this._storage.setItem(key, JSON.stringify(obj));
} catch (exc) {
// Catch for QuotaExceededError and disable writes on local storage the
// first time that it occurs.
if (exc.code === 22) {
this._exceededQuota = true;
console.warn('Local storage quota exceeded: disabling');
return;
} else {
throw exc;
}
}
},
});
})();