1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
6 * @fileoverview A class for managing all enumerated gnubby devices.
20 * isSharedAccess: boolean,
21 * enumerate: function(function(Array)),
22 * deviceToDeviceId: function(*): GnubbyDeviceId,
23 * open: function(Gnubbies, number, *, function(number, GnubbyDevice=))
26 var GnubbyNamespaceImpl;
29 * Manager of opened devices.
33 /** @private {Object<Array>} */
35 this.pendingEnumerate = []; // clients awaiting an enumerate
37 * The distinct namespaces registered in this Gnubbies instance, in order of
39 * @private {Array<string>}
41 this.namespaces_ = [];
42 /** @private {Object<GnubbyNamespaceImpl>} */
44 /** @private {Object<Object<number, !GnubbyDevice>>} */
46 /** @private {Object<Object<number, *>>} */
47 this.pendingOpens_ = {}; // clients awaiting an open
51 * Registers a new gnubby namespace, i.e. an implementation of the
52 * enumerate/open functions for all devices within a namespace.
53 * @param {string} namespace The namespace of the numerator, e.g. 'usb'.
54 * @param {GnubbyNamespaceImpl} impl The implementation.
56 Gnubbies.prototype.registerNamespace = function(namespace, impl) {
57 if (!this.impl_.hasOwnProperty(namespace)) {
58 this.namespaces_.push(namespace);
60 this.impl_[namespace] = impl;
64 * @param {GnubbyDeviceId} id The device id.
65 * @return {boolean} Whether the device is a shared access device.
67 Gnubbies.prototype.isSharedAccess = function(id) {
68 if (!this.impl_.hasOwnProperty(id.namespace)) return false;
69 return this.impl_[id.namespace].isSharedAccess;
73 * @param {GnubbyDeviceId} which The device to remove.
75 Gnubbies.prototype.removeOpenDevice = function(which) {
76 if (this.openDevs_[which.namespace] &&
77 this.openDevs_[which.namespace].hasOwnProperty(which.device)) {
78 delete this.openDevs_[which.namespace][which.device];
82 /** Close all enumerated devices. */
83 Gnubbies.prototype.closeAll = function() {
84 if (this.inactivityTimer) {
85 this.inactivityTimer.clearTimeout();
86 this.inactivityTimer = undefined;
88 // Close and stop talking to any gnubbies we have enumerated.
89 for (var namespace in this.openDevs_) {
90 for (var dev in this.openDevs_[namespace]) {
91 var deviceId = Number(dev);
92 this.openDevs_[namespace][deviceId].destroy();
100 * @param {function(number, Array<GnubbyDeviceId>)} cb Called back with the
101 * result of enumerating.
103 Gnubbies.prototype.enumerate = function(cb) {
105 cb = function(rc, indexes) {
106 var msg = 'defaultEnumerateCallback(' + rc;
109 for (var i = 0; i < indexes.length; i++) {
110 msg += JSON.stringify(indexes[i]);
115 console.log(UTIL_fmt(msg));
119 if (!this.namespaces_.length) {
120 cb(-GnubbyDevice.OK, []);
124 var namespacesEnumerated = 0;
128 * @param {string} namespace The namespace that was enumerated.
129 * @param {Array<GnubbyDeviceId>} existingDeviceIds Previously enumerated
130 * device IDs (from other namespaces), if any.
131 * @param {Array} devs The devices in the namespace.
133 function enumerated(namespace, existingDeviceIds, devs) {
134 namespacesEnumerated++;
135 var lastNamespace = (namespacesEnumerated == self.namespaces_.length);
137 if (chrome.runtime.lastError) {
138 console.warn(UTIL_fmt('lastError: ' + chrome.runtime.lastError));
139 console.log(chrome.runtime.lastError);
143 console.log(UTIL_fmt('Enumerated ' + devs.length + ' gnubbies'));
146 var presentDevs = {};
148 var deviceToDeviceId = self.impl_[namespace].deviceToDeviceId;
149 for (var i = 0; i < devs.length; ++i) {
150 var deviceId = deviceToDeviceId(devs[i]);
151 deviceIds.push(deviceId);
152 presentDevs[deviceId.device] = devs[i];
156 for (var dev in self.openDevs_[namespace]) {
157 if (!presentDevs.hasOwnProperty(dev)) {
162 for (var i = 0; i < toRemove.length; i++) {
164 if (self.openDevs_[namespace][dev]) {
165 self.openDevs_[namespace][dev].destroy();
166 delete self.openDevs_[namespace][dev];
170 self.devs_[namespace] = devs;
171 existingDeviceIds.push.apply(existingDeviceIds, deviceIds);
173 while (self.pendingEnumerate.length != 0) {
174 var cb = self.pendingEnumerate.shift();
175 cb(-GnubbyDevice.OK, existingDeviceIds);
181 function makeEnumerateCb(namespace) {
182 return function(devs) {
183 enumerated(namespace, deviceIds, devs);
187 this.pendingEnumerate.push(cb);
188 if (this.pendingEnumerate.length == 1) {
189 for (var i = 0; i < this.namespaces_.length; i++) {
190 var namespace = this.namespaces_[i];
191 var enumerator = this.impl_[namespace].enumerate;
192 enumerator(makeEnumerateCb(namespace));
198 * Amount of time past last activity to set the inactivity timer to, in millis.
201 Gnubbies.INACTIVITY_TIMEOUT_MARGIN_MILLIS = 30000;
204 * @param {number|undefined} opt_timeoutMillis Timeout in milliseconds
206 Gnubbies.prototype.resetInactivityTimer = function(opt_timeoutMillis) {
207 var millis = opt_timeoutMillis ?
208 opt_timeoutMillis + Gnubbies.INACTIVITY_TIMEOUT_MARGIN_MILLIS :
209 Gnubbies.INACTIVITY_TIMEOUT_MARGIN_MILLIS;
210 if (!this.inactivityTimer) {
211 this.inactivityTimer =
212 new CountdownTimer(millis, this.inactivityTimeout_.bind(this));
213 } else if (millis > this.inactivityTimer.millisecondsUntilExpired()) {
214 this.inactivityTimer.clearTimeout();
215 this.inactivityTimer.setTimeout(millis, this.inactivityTimeout_.bind(this));
220 * Called when the inactivity timeout expires.
223 Gnubbies.prototype.inactivityTimeout_ = function() {
224 this.inactivityTimer = undefined;
225 for (var namespace in this.openDevs_) {
226 for (var dev in this.openDevs_[namespace]) {
227 var deviceId = Number(dev);
228 console.warn(namespace + ' device ' + deviceId +
229 ' still open after inactivity, closing');
230 this.openDevs_[namespace][deviceId].destroy();
236 * Opens and adds a new client of the specified device.
237 * @param {GnubbyDeviceId} which Which device to open.
238 * @param {*} who Client of the device.
239 * @param {function(number, GnubbyDevice=)} cb Called back with the result of
240 * opening the device.
242 Gnubbies.prototype.addClient = function(which, who, cb) {
243 this.resetInactivityTimer();
247 function opened(gnubby, who, cb) {
248 if (gnubby.closing) {
249 // Device is closing or already closed.
250 self.removeClient(gnubby, who);
251 if (cb) { cb(-GnubbyDevice.NODEVICE); }
253 gnubby.registerClient(who);
254 if (cb) { cb(-GnubbyDevice.OK, gnubby); }
258 function notifyOpenResult(rc) {
259 if (self.pendingOpens_[which.namespace]) {
260 while (self.pendingOpens_[which.namespace][which.device].length != 0) {
261 var client = self.pendingOpens_[which.namespace][which.device].shift();
264 delete self.pendingOpens_[which.namespace][which.device];
269 var deviceToDeviceId = this.impl_[which.namespace].deviceToDeviceId;
270 if (this.devs_[which.namespace]) {
271 for (var i = 0; i < this.devs_[which.namespace].length; i++) {
272 var device = this.devs_[which.namespace][i];
273 if (deviceToDeviceId(device).device == which.device) {
280 // Index out of bounds. Device does not exist in current enumeration.
281 this.removeClient(null, who);
282 if (cb) { cb(-GnubbyDevice.NODEVICE); }
286 function openCb(rc, opt_gnubby) {
288 notifyOpenResult(rc);
292 notifyOpenResult(-GnubbyDevice.NODEVICE);
295 var gnubby = /** @type {!GnubbyDevice} */ (opt_gnubby);
296 if (!self.openDevs_[which.namespace]) {
297 self.openDevs_[which.namespace] = {};
299 self.openDevs_[which.namespace][which.device] = gnubby;
300 while (self.pendingOpens_[which.namespace][which.device].length != 0) {
301 var client = self.pendingOpens_[which.namespace][which.device].shift();
302 opened(gnubby, client.who, client.cb);
304 delete self.pendingOpens_[which.namespace][which.device];
307 if (this.openDevs_[which.namespace] &&
308 this.openDevs_[which.namespace].hasOwnProperty(which.device)) {
309 var gnubby = this.openDevs_[which.namespace][which.device];
310 opened(gnubby, who, cb);
312 var opener = {who: who, cb: cb};
313 if (!this.pendingOpens_.hasOwnProperty(which.namespace)) {
314 this.pendingOpens_[which.namespace] = {};
316 if (this.pendingOpens_[which.namespace].hasOwnProperty(which.device)) {
317 this.pendingOpens_[which.namespace][which.device].push(opener);
319 this.pendingOpens_[which.namespace][which.device] = [opener];
320 var openImpl = this.impl_[which.namespace].open;
321 openImpl(this, which.device, dev, openCb);
327 * Removes a client from a low-level gnubby.
328 * @param {GnubbyDevice} whichDev The gnubby.
329 * @param {*} who The client.
331 Gnubbies.prototype.removeClient = function(whichDev, who) {
332 console.log(UTIL_fmt('Gnubbies.removeClient()'));
334 this.resetInactivityTimer();
336 // De-register client from all known devices.
337 for (var namespace in this.openDevs_) {
338 for (var devId in this.openDevs_[namespace]) {
339 var deviceId = Number(devId);
340 var dev = this.openDevs_[namespace][deviceId];
341 if (dev.hasClient(who)) {
342 if (whichDev && dev != whichDev) {
343 console.warn('Gnubby attached to more than one device!?');
345 if (!dev.deregisterClient(who)) {