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build/node_modules/sw-toolbox/lib/strategies/fastest.js

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+/*
+  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;