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// Copyright (c) 2012 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.
// Custom bindings for the Bluetooth API.
var chromeHidden = requireNative('chrome_hidden').GetChromeHidden();
var sendRequest = require('sendRequest').sendRequest;
var lastError = require('lastError');
// Use custom bindings to create an undocumented event listener that will
// receive events about device discovery and call the event listener that was
// provided with the request to begin discovery.
chromeHidden.registerCustomHook('bluetooth', function(api) {
var apiFunctions = api.apiFunctions;
chromeHidden.bluetooth = {};
function callCallbackIfPresent(args) {
if (typeof(args[args.length-1]) == "function") {
args[args.length-1]();
}
}
chromeHidden.bluetooth.deviceDiscoveredHandler = null;
chromeHidden.bluetooth.onDeviceDiscovered =
new chrome.Event("bluetooth.onDeviceDiscovered");
function clearDeviceDiscoveredHandler() {
chromeHidden.bluetooth.onDeviceDiscovered.removeListener(
chromeHidden.bluetooth.deviceDiscoveredHandler);
chromeHidden.bluetooth.deviceDiscoveredHandler = null;
}
apiFunctions.setHandleRequest('startDiscovery',
function() {
var args = arguments;
if (args.length > 0 && args[0] && args[0].deviceCallback) {
if (chromeHidden.bluetooth.deviceDiscoveredHandler != null) {
lastError.set("Concurrent discovery is not allowed.");
callCallbackIfPresent(args);
return;
}
chromeHidden.bluetooth.deviceDiscoveredHandler =
args[0].deviceCallback;
chromeHidden.bluetooth.onDeviceDiscovered.addListener(
chromeHidden.bluetooth.deviceDiscoveredHandler);
sendRequest(this.name,
args,
this.definition.parameters,
{customCallback:this.customCallback});
} else {
lastError.set("deviceCallback is required in the options object");
callCallbackIfPresent(args);
}
});
apiFunctions.setCustomCallback('startDiscovery',
function(name, request, response) {
if (chrome.runtime.lastError) {
clearDeviceDiscoveredHandler();
return;
}
});
apiFunctions.setHandleRequest('stopDiscovery',
function() {
clearDeviceDiscoveredHandler();
sendRequest(this.name, arguments, this.definition.parameters);
});
// An object to hold state during one call to getDevices.
chromeHidden.bluetooth.getDevicesState = null;
// Hidden events used to deliver getDevices data to the client callbacks
chromeHidden.bluetooth.onDeviceSearchResult =
new chrome.Event("bluetooth.onDeviceSearchResult");
chromeHidden.bluetooth.onDeviceSearchFinished =
new chrome.Event("bluetooth.onDeviceSearchFinished");
function deviceSearchResultHandler(device) {
chromeHidden.bluetooth.getDevicesState.actualEvents++;
chromeHidden.bluetooth.getDevicesState.deviceCallback(device);
maybeFinishDeviceSearch();
}
function deviceSearchFinishedHandler(info) {
chromeHidden.bluetooth.getDevicesState.expectedEventCount =
info.expectedEventCount;
maybeFinishDeviceSearch();
}
function addDeviceSearchListeners() {
chromeHidden.bluetooth.onDeviceSearchResult.addListener(
deviceSearchResultHandler);
chromeHidden.bluetooth.onDeviceSearchFinished.addListener(
deviceSearchFinishedHandler);
}
function removeDeviceSearchListeners() {
chromeHidden.bluetooth.onDeviceSearchResult.removeListener(
deviceSearchResultHandler);
chromeHidden.bluetooth.onDeviceSearchFinished.removeListener(
deviceSearchFinishedHandler);
}
function maybeFinishDeviceSearch() {
var state = chromeHidden.bluetooth.getDevicesState;
if (typeof(state.expectedEventCount) != 'undefined' &&
state.actualEvents >= state.expectedEventCount) {
finishDeviceSearch();
}
}
function finishDeviceSearch() {
var finalCallback = chromeHidden.bluetooth.getDevicesState.finalCallback;
removeDeviceSearchListeners();
chromeHidden.bluetooth.getDevicesState = null;
if (finalCallback) {
finalCallback();
}
}
apiFunctions.setUpdateArgumentsPostValidate('getDevices',
function() {
var args = Array.prototype.slice.call(arguments);
if (chromeHidden.bluetooth.getDevicesState != null) {
throw new Error("Concurrent calls to getDevices are not allowed.");
}
var state = { actualEvents: 0 };
if (typeof(args[args.length - 1]) == "function") {
state.finalCallback = args.pop();
args.push(
function() {
if (chrome.runtime.lastError) {
finishDeviceSearch();
}
});
} else {
throw new Error("getDevices must have a final callback parameter.");
}
if (typeof(args[0].deviceCallback) == "function") {
state.deviceCallback = args[0].deviceCallback;
} else {
throw new Error("getDevices must be passed options with a " +
"deviceCallback.");
}
chromeHidden.bluetooth.getDevicesState = state;
addDeviceSearchListeners();
return args;
});
});
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