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/**
* Copyright (c) 2019 ESHA Research
* Dual licensed under the MIT and GPL licenses:
* https://www.opensource.org/licenses/mit-license.php
* https://www.gnu.org/licenses/gpl.html
*
* Adds an 'async' duplicate on all store APIs that
* performs storage-related operations asynchronously and returns
* a promise.
*
* Status: BETA - works great, but lacks justification for existence
*/
;(function(window, _) {
var dontPromisify = ['async', 'area', 'namespace', 'isFake', 'toString'];
_.promisify = function(api) {
var async = api.async = _.Store(api._id, api._area, api._ns);
async._async = true;
Object.keys(api).forEach(function(name) {
if (name.charAt(0) !== '_' && dontPromisify.indexOf(name) < 0) {
var fn = api[name];
if (typeof fn === "function") {
async[name] = _.promiseFn(name, fn, api);
}
}
});
return async;
};
_.promiseFn = function(name, fn, self) {
return function promised() {
var args = arguments;
return new Promise(function(resolve, reject) {
setTimeout(function() {
try {
resolve(fn.apply(self, args));
} catch (e) {
reject(e);
}
}, 0);
});
};
};
// promisify existing apis
for (var apiName in _.apis) {
_.promisify(_.apis[apiName]);
}
// ensure future apis are promisified
Object.defineProperty(_.storeAPI, 'async', {
enumerable: true,
configurable: true,
get: function() {
var async = _.promisify(this);
// overwrite getter to avoid re-promisifying
Object.defineProperty(this, 'async', {
enumerable: true,
value: async
});
return async;
}
});
})(window, window.store._);