54 lines
1.5 KiB
JavaScript
54 lines
1.5 KiB
JavaScript
/*
|
|
Copyright 2014 Google Inc. All Rights Reserved.
|
|
|
|
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.
|
|
*/
|
|
'use strict';
|
|
var helpers = require('../helpers');
|
|
var cacheOnly = require('./cacheOnly');
|
|
|
|
function fastest(request, values, options) {
|
|
helpers.debug('Strategy: fastest [' + request.url + ']', options);
|
|
|
|
return new Promise(function(resolve, reject) {
|
|
var rejected = false;
|
|
var reasons = [];
|
|
|
|
var maybeReject = function(reason) {
|
|
reasons.push(reason.toString());
|
|
if (rejected) {
|
|
reject(new Error('Both cache and network failed: "' +
|
|
reasons.join('", "') + '"'));
|
|
} else {
|
|
rejected = true;
|
|
}
|
|
};
|
|
|
|
var maybeResolve = function(result) {
|
|
if (result instanceof Response) {
|
|
resolve(result);
|
|
} else {
|
|
maybeReject('No result returned');
|
|
}
|
|
};
|
|
|
|
helpers.fetchAndCache(request.clone(), options)
|
|
.then(maybeResolve, maybeReject);
|
|
|
|
cacheOnly(request, values, options)
|
|
.then(maybeResolve, maybeReject);
|
|
});
|
|
}
|
|
|
|
module.exports = fastest;
|