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angular-chrome-storage.js
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'use strict';
angular.module("chromeStorage", [])
.factory('chromeStorage', function ($q) {
var area = chrome.storage.local; // change this to chrome.storage.sync for sync capabilities
/**
* These are provided and updated only for debugging purposes.
*/
var totalBytes = null;
var cache = {};
/**
* A call to get the bytes in use, returns a promise of the size of an individual key, or
* of total bytes in use, if no key is specified.
*/
var getBytesInUse = function (keys) {
var deferred = $q.defer();
area.getBytesInUse(keys, function (bytesInUse) {
if (chrome.runtime.lasterror) {
console.log("error retrieving bytes in use for keys " + keys);
deferred.reject(chrome.runtime.lasterror.message);
}
else {
console.log("retrieved bytes in use for keys " + keys + ": " + bytesInUse);
deferred.resolve(bytesInUse);
}
});
return deferred.promise;
}
return {
getDebuggingTotalBytesInUse: function () {
return totalBytes;
},
getDebuggingCache: function () {
return cache;
},
/**
* Returns the usage of the current storage quota, as a number between 0.0 and 1.0
*/
getDebuggingPercentUsed: function () {
var percent = totalBytes / area.QUOTA_BYTES;
return percent;
},
getDebuggingSizeOf: function (key) {
return angular.toJson(cache[key]).length;
},
updateDebuggingCache: function () {
var deferred = $q.defer();
area.get(null, function (value) {
if (chrome.runtime.lasterror) {
deferred.reject(chrome.runtime.lasterror.message);
} else {
//console.log('get then for all keys : ' + angular.toJson(value));
deferred.resolve(value);
}
});
deferred.promise.then(function (data) {
cache = data;
});
},
updateDebuggingTotalBytes: function () {
getBytesInUse(null).then(function (data) {
console.log("total bytes in use: " + data);
totalBytes = data;
});
},
clear: function () {
var deferred = $q.defer();
// console.log('clearing chrome storage');
area.clear(function () {
if (chrome.runtime.lastError) {
deferred.reject(chrome.runtime.lasterror.message);
//console.error("error clearing chrome storage" + chrome.runtime.lastError);
} else {
deferred.resolve();
//console.log("chrome storage has been cleared");
}
});
return deferred.promise;
},
drop: function (key) {
var deferred = $q.defer();
area.remove(key, function () {
if (chrome.runtime.lasterror) {
deferred.reject(chrome.runtime.lasterror.message);
//console.error(chrome.runtime.lasterror.message);
} else {
deferred.resolve();
// console.log("key " + key + " has been dropped from the storage cache")
}
});
return deferred.promise;
},
get: function (key) {
var deferred = $q.defer();
area.get(key, function (value) {
// console.log('getTotalBytesInUse then with key ' + key + " : " + angular.toJson(value));
var keyValue = value[key];
deferred.resolve(keyValue);
});
return deferred.promise;
},
set: function (key, val) {
var deferred = $q.defer();
if(angular.isDefined(key) && angular.isDefined(val)){
var saveObject = {};
saveObject[key] = val;
area.set(saveObject, function () {
if (chrome.runtime.lasterror) {
deferred.reject(chrome.runtime.lasterror.message);
//console.error(chrome.runtime.lasterror.message);
} else {
//console.log('saved ' + keyValue + " to key " + key);
deferred.resolve();
}
});
} else {
deferred.reject('provided key or value are undefined');
}
return deferred.promise;
},
/**
* gets the value of key from the chrome storage, or calls the fallback function, and populates the storage
* with the value of the promise returned
*/
getOrElse: function (key, fallback) {
// console.log('getOrElse called with cached key ' + key);
var deferred = $q.defer();
area.get(key, function (value) {
// console.log('getOrElse then with cached key ' + key + " : " + angular.toJson(value));
var keyValue = value[key];
if (keyValue == undefined || keyValue == null) {
// console.log("no cached value for "+ key + ". using fallback method.");
fallback().then(function (data) {
keyValue = data;
// console.log("caching value for "+ key + " : " + angular.toJson(keyValue));
var saveObject = {};
saveObject[key] = keyValue;
area.set(saveObject, function () {
if (chrome.runtime.lasterror) {
console.error(chrome.runtime.lasterror.message);
} else {
//console.log('saved ' + keyValue + " to key " + key);
}
});
deferred.resolve(keyValue);
});
} else {
deferred.resolve(keyValue);
}
});
return deferred.promise;
},
/**
* gets the value of key from the cache, or calls the fallback function, and populates the cache
* with the value of the promise returned
*/
forceGet: function (key, fallback) {
// console.log('getOrElse called with cached key ' + key);
var deferred = $q.defer();
fallback().then(function (data) {
var keyValue = data;
// console.log("caching value for "+ key + " : " + angular.toJson(keyValue));
var saveObject = {};
saveObject[key] = keyValue;
area.set(saveObject, function () {
if (chrome.runtime.lasterror) {
console.error(chrome.runtime.lasterror.message);
} else {
//console.log('saved ' + keyValue + " to key " + key);
}
});
deferred.resolve(keyValue);
});
return deferred.promise;
},
/**
* Returns the quota of the current storage method, in bytes
*/
getQuota: function () {
return area.QUOTA_BYTES;
}
}
});