| // Copyright 2017 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. |
| |
| goog.provide('__crWeb.mojoApi'); |
| |
| // Note: The API should stay in sync with the IDL definitions in |
| // third_party/WebKit/Source/core/mojo |
| |
| var Mojo = Mojo || {}; |
| |
| /** |
| * MojoResult {number}: Result codes for Mojo operations. |
| */ |
| Mojo.RESULT_OK = 0; |
| Mojo.RESULT_CANCELLED = 1; |
| Mojo.RESULT_UNKNOWN = 2; |
| Mojo.RESULT_INVALID_ARGUMENT = 3; |
| Mojo.RESULT_DEADLINE_EXCEEDED = 4; |
| Mojo.RESULT_NOT_FOUND = 5; |
| Mojo.RESULT_ALREADY_EXISTS = 6; |
| Mojo.RESULT_PERMISSION_DENIED = 7; |
| Mojo.RESULT_RESOURCE_EXHAUSTED = 8; |
| Mojo.RESULT_FAILED_PRECONDITION = 9; |
| Mojo.RESULT_ABORTED = 10; |
| Mojo.RESULT_OUT_OF_RANGE = 11; |
| Mojo.RESULT_UNIMPLEMENTED = 12; |
| Mojo.RESULT_INTERNAL = 13; |
| Mojo.RESULT_UNAVAILABLE = 14; |
| Mojo.RESULT_DATA_LOSS = 15; |
| Mojo.RESULT_BUSY = 16; |
| Mojo.RESULT_SHOULD_WAIT = 17; |
| |
| /** |
| * Creates a message pipe. |
| * |
| * @return {result: !MojoResult, handle0: !MojoHandle=, handle1: !MojoHandle=} |
| * Result code and (on success) the two message pipe handles. |
| */ |
| Mojo.createMessagePipe = function() { |
| var result = Mojo.internal.sendMessage({ |
| name: "Mojo.createMessagePipe", |
| args: {} |
| }); |
| if (result.result == Mojo.RESULT_OK) { |
| result.handle0 = new MojoHandle(result.handle0); |
| result.handle1 = new MojoHandle(result.handle1); |
| } |
| return result; |
| }; |
| |
| /** |
| * Binds to the specified Mojo interface. |
| * @param {string} interfaceName The interface name to connect. |
| * @param {!MojoHandle} requestHandle The interface request handle. |
| */ |
| Mojo.bindInterface = function(interfaceName, requestHandle) { |
| Mojo.internal.sendMessage({ |
| name: "Mojo.bindInterface", |
| args: { |
| interfaceName: interfaceName, |
| requestHandle: requestHandle.takeNativeHandle_() |
| } |
| }); |
| }; |
| |
| /** |
| * @constructor |
| * @param {?number=} nativeHandle An opaque number representing the underlying |
| * Mojo system resource. |
| */ |
| var MojoHandle = function(nativeHandle) { |
| if (nativeHandle === undefined) |
| nativeHandle = null; |
| |
| /** |
| * @type {number|null} |
| */ |
| this.nativeHandle_ = nativeHandle; |
| }; |
| |
| /** |
| * Takes the native handle value. This is not part of the public API. |
| * @return {?number} |
| */ |
| MojoHandle.prototype.takeNativeHandle_ = function() { |
| var nativeHandle = this.nativeHandle_; |
| this.nativeHandle_ = null; |
| return nativeHandle; |
| }; |
| |
| /** |
| * Closes the handle. |
| */ |
| MojoHandle.prototype.close = function() { |
| if (this.nativeHandle_ === null) |
| return; |
| |
| var nativeHandle = this.nativeHandle_; |
| this.nativeHandle_ = null; |
| Mojo.internal.sendMessage({ |
| name: "MojoHandle.close", |
| args: { |
| handle: nativeHandle |
| } |
| }); |
| }; |
| |
| /** |
| * Begins watching the handle for |signals| to be satisfied or unsatisfiable. |
| * |
| * @param {readable: boolean=, writable: boolean=, peerClosed: boolean=} signals |
| * The signals to watch. |
| * @param {!function(!MojoResult)} calback Called with a result any time |
| * the watched signals become satisfied or unsatisfiable. |
| * |
| * @return {!MojoWatcher} A MojoWatcher instance that could be used to cancel |
| * the watch. |
| */ |
| MojoHandle.prototype.watch = function(signals, callback) { |
| var HANDLE_SIGNAL_NONE = 0; |
| var HANDLE_SIGNAL_READABLE = 1; |
| var HANDLE_SIGNAL_WRITABLE = 2; |
| var HANDLE_SIGNAL_PEER_CLOSED = 4; |
| |
| var signalsValue = HANDLE_SIGNAL_NONE; |
| if (signals.readable) { |
| signalsValue |= HANDLE_SIGNAL_READABLE; |
| } |
| if (signals.writable) { |
| signalsValue |= HANDLE_SIGNAL_WRITABLE; |
| } |
| if (signalsValue.peerClosed) { |
| signalsValue |= HANDLE_SIGNAL_PEER_CLOSED; |
| } |
| |
| var watchId = Mojo.internal.sendMessage({ |
| name: "MojoHandle.watch", |
| args: { |
| handle: this.nativeHandle_, |
| signals: signalsValue, |
| callbackId: Mojo.internal.watchCallbacksHolder.getNextCallbackId() |
| } |
| }); |
| Mojo.internal.watchCallbacksHolder.addWatchCallback(watchId, callback); |
| |
| return new MojoWatcher(watchId); |
| }; |
| |
| /** |
| * Writes a message to the message pipe. |
| * |
| * @param {!ArrayBufferView} buffer The message data. May be empty. |
| * @param {!Array<!MojoHandle>} handles Any handles to attach. Handles are |
| * transferred and will no longer be valid. May be empty. |
| * @return {!MojoResult} Result code. |
| */ |
| MojoHandle.prototype.writeMessage = function(buffer, handles) { |
| var nativeHandles = handles.map(function(handle) { |
| return handle.takeNativeHandle_(); |
| }); |
| return Mojo.internal.sendMessage({ |
| name: "MojoHandle.writeMessage", |
| args: { |
| handle: this.nativeHandle_, |
| buffer: buffer, |
| handles: nativeHandles, |
| } |
| }); |
| }; |
| |
| /** |
| * Reads a message from the message pipe. |
| * |
| * @return {result: !MojoResult, |
| * buffer: !ArrayBufferView=, |
| * handles: !Array<!MojoHandle>=} |
| * Result code and (on success) the data and handles recevied. |
| */ |
| MojoHandle.prototype.readMessage = function() { |
| var result = Mojo.internal.sendMessage({ |
| name: "MojoHandle.readMessage", |
| args: { |
| handle: this.nativeHandle_ |
| } |
| }); |
| |
| if (result.result == Mojo.RESULT_OK) { |
| result.buffer = new Uint8Array(result.buffer).buffer; |
| result.handles = result.handles.map(function(handle) { |
| return new MojoHandle(handle); |
| }); |
| } |
| return result; |
| }; |
| |
| /** |
| * MojoWatcher identifies a watch on a MojoHandle and can be used to cancel the |
| * watch. |
| * |
| * @constructor |
| * @param {number} An opaque id representing the watch. |
| */ |
| var MojoWatcher = function(watchId) { |
| this.watchId_ = watchId; |
| }; |
| |
| /* |
| * Cancels a handle watch. |
| */ |
| MojoWatcher.prototype.cancel = function() { |
| Mojo.internal.sendMessage({ |
| name: "MojoWatcher.cancel", |
| args: { |
| watchId: this.watchId_ |
| } |
| }); |
| Mojo.internal.watchCallbacksHolder.removeWatchCallback(watchId); |
| }; |
| |
| // ----------------------------------------------------------------------------- |
| // Mojo API implementation details. It is not part of the public API. |
| |
| Mojo.internal = Mojo.internal || {}; |
| |
| /** |
| * Synchronously sends a message to Mojo backend. |
| * @param {!Object} message The message to send. |
| * @return {Object=} Response from Mojo backend. |
| */ |
| Mojo.internal.sendMessage = function(message) { |
| var response = window.prompt(__gCrWeb.common.JSONStringify(message)); |
| return response ? JSON.parse(response) : undefined; |
| }; |
| |
| /** |
| * Holds callbacks for all currently active watches. |
| */ |
| Mojo.internal.watchCallbacksHolder = (function() { |
| /** |
| * Next callback id to be used for watch. |
| * @type{number} |
| */ |
| var nextCallbackId = 0; |
| |
| /** |
| * Map where keys are callbacks ids and values are callbacks. |
| * @type {!Map<number, !function(!MojoResult)>} |
| */ |
| var callbacks = new Map(); |
| |
| /** |
| * Map where keys are watch ids and values are callback ids. |
| * @type {!Map<number, number>} |
| */ |
| var callbackIds = new Map(); |
| |
| /** |
| * Calls watch callback. |
| * |
| * @param {number} callbackId Callback id previously returned from |
| {@code getNextCallbackId}. |
| * @param {!MojoResult} mojoResult The result code to call the callback with. |
| */ |
| var callCallback = function(callbackId, mojoResult) { |
| var callback = callbacks.get(callbackId); |
| |
| // Signalling the watch is asynchronous operation and this function may be |
| // called for already removed watch. |
| if (callback) |
| callback(mojoResult); |
| }; |
| |
| /** |
| * Returns next callback id to be used for watch (idempotent). |
| * |
| * @return {number} callback id. |
| */ |
| var getNextCallbackId = function() { |
| return nextCallbackId; |
| }; |
| |
| /** |
| * Adds callback which must be executed when the watch fires. |
| * |
| * @param {number} watchId The value returned from "MojoHandle.watch" Mojo |
| * backend. |
| * @param {!function(!MojoResult)} callback The callback which should be |
| * executed when the watch fires. |
| */ |
| var addWatchCallback = function(watchId, callback) { |
| callbackIds.set(watchId, nextCallbackId); |
| callbacks.set(nextCallbackId, callback); |
| ++nextCallbackId; |
| }; |
| |
| /** |
| * Removes callback which should no longer be executed. |
| * |
| * @param {!number} watchId The id to remove callback for. |
| */ |
| var removeWatchCallback = function (watchId) { |
| callbacks.delete(callbackIds.get(watchId)); |
| callbackIds.delete(watchId); |
| }; |
| |
| return { |
| callCallback: callCallback, |
| getNextCallbackId: getNextCallbackId, |
| addWatchCallback: addWatchCallback, |
| removeWatchCallback: removeWatchCallback |
| }; |
| })(); |
| |