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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// This function is returned to DidInitializeServiceWorkerContextOnWorkerThread
// then executed, passing in dependencies as function arguments.
//
// |backgroundUrl| is the URL of the extension's background page.
// |wakeEventPage| is a function that wakes up the current extension's event
// page, then runs its callback on completion or failure.
// |logging| is an object equivalent to a subset of base/debug/logging.h, with
// CHECK/DCHECK/etc.
(function(backgroundUrl, wakeEventPage, logging) {
'use strict';
self.chrome = self.chrome || {};
self.chrome.runtime = self.chrome.runtime || {};
// Returns a Promise that resolves to the background page's client, or null
// if there is no background client.
function findBackgroundClient() {
return self.clients.matchAll({
includeUncontrolled: true,
type: 'window'
}).then(function(clients) {
return clients.find(function(client) {
return client.url == backgroundUrl;
});
});
}
// Returns a Promise wrapper around wakeEventPage, that resolves on success,
// or rejects on failure.
function makeWakeEventPagePromise() {
return new Promise(function(resolve, reject) {
wakeEventPage(function(success) {
if (success)
resolve();
else
reject('Failed to start background client "' + backgroundUrl + '"');
});
});
}
// The chrome.runtime.getBackgroundClient function is documented in
// runtime.json. It returns a Promise that resolves to the background page's
// client, or is rejected if there is no background client or if the
// background client failed to wake.
self.chrome.runtime.getBackgroundClient = function() {
return findBackgroundClient().then(function(client) {
if (client) {
// Background client is already awake, or it was persistent.
return client;
}
// Event page needs to be woken.
return makeWakeEventPagePromise().then(function() {
return findBackgroundClient();
}).then(function(client) {
if (!client) {
return Promise.reject(
'Background client "' + backgroundUrl + '" not found');
}
return client;
});
});
};
});
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