442 lines
14 KiB
Plaintext
442 lines
14 KiB
Plaintext
![]() |
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @flow
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* @format
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*/
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'use strict';
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import type {Page, MessageFromDevice, MessageToDevice} from './types';
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import WS from 'ws';
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const PAGES_POLLING_INTERVAL = 1000;
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const debug = require('debug')('Metro:InspectorProxy');
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// Android's stock emulator and other emulators such as genymotion use a standard localhost alias.
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const EMULATOR_LOCALHOST_ADDRESSES: Array<string> = ['10.0.2.2', '10.0.3.2'];
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// Prefix for script URLs that are alphanumeric IDs. See comment in _processMessageFromDevice method for
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// more details.
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const FILE_PREFIX = 'file://';
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type DebuggerInfo = {
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// Debugger web socket connection
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socket: WS,
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// If we replaced address (like '10.0.2.2') to localhost we need to store original
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// address because Chrome uses URL or urlRegex params (instead of scriptId) to set breakpoints.
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originalSourceURLAddress?: string,
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prependedFilePrefix: boolean,
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pageId: string,
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...
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};
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const REACT_NATIVE_RELOADABLE_PAGE = {
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id: '-1',
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title: 'React Native Experimental (Improved Chrome Reloads)',
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vm: "don't use",
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app: "don't use",
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};
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/**
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* Device class represents single device connection to Inspector Proxy. Each device
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* can have multiple inspectable pages.
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*/
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class Device {
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// ID of the device.
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_id: number;
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// Name of the device.
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_name: string;
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// Package name of the app.
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_app: string;
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// Stores socket connection between Inspector Proxy and device.
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_deviceSocket: WS;
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// Stores last list of device's pages.
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_pages: Array<Page>;
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// Stores information about currently connected debugger (if any).
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_debuggerConnection: ?DebuggerInfo = null;
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// Last known Page ID of the React Native page.
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// This is used by debugger connections that don't have PageID specified
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// (and will interact with the latest React Native page).
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_lastReactNativePageId: ?string = null;
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// Whether we are in the middle of a reload in the REACT_NATIVE_RELOADABLE_PAGE.
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_isReloading: boolean = false;
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// The previous "GetPages" message, for deduplication in debug logs.
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_lastGetPagesMessage: string = '';
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constructor(id: number, name: string, app: string, socket: WS) {
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this._id = id;
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this._name = name;
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this._app = app;
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this._pages = [];
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this._deviceSocket = socket;
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this._deviceSocket.on('message', (message: string) => {
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const parsedMessage = JSON.parse(message);
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if (parsedMessage.event === 'getPages') {
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// There's a 'getPages' message every second, so only show them if they change
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if (message !== this._lastGetPagesMessage) {
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debug(
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'(Debugger) (Proxy) <- (Device), getPages ping has changed: ' +
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message,
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);
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this._lastGetPagesMessage = message;
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}
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} else {
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debug('(Debugger) (Proxy) <- (Device): ' + message);
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}
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this._handleMessageFromDevice(parsedMessage);
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});
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this._deviceSocket.on('close', () => {
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// Device disconnected - close debugger connection.
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if (this._debuggerConnection) {
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this._debuggerConnection.socket.close();
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this._debuggerConnection = null;
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}
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});
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this._setPagesPolling();
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}
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getName(): string {
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return this._name;
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}
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getPagesList(): Array<Page> {
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if (this._lastReactNativePageId) {
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return this._pages.concat(REACT_NATIVE_RELOADABLE_PAGE);
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} else {
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return this._pages;
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}
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}
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// Handles new debugger connection to this device:
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// 1. Sends connect event to device
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// 2. Forwards all messages from the debugger to device as wrappedEvent
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// 3. Sends disconnect event to device when debugger connection socket closes.
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handleDebuggerConnection(socket: WS, pageId: string) {
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// Disconnect current debugger if we already have debugger connected.
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if (this._debuggerConnection) {
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this._debuggerConnection.socket.close();
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this._debuggerConnection = null;
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}
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const debuggerInfo = {
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socket,
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prependedFilePrefix: false,
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pageId,
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};
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this._debuggerConnection = debuggerInfo;
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debug(`Got new debugger connection for page ${pageId} of ${this._name}`);
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this._sendMessageToDevice({
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event: 'connect',
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payload: {
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pageId: this._getPageId(pageId),
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},
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});
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socket.on('message', (message: string) => {
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debug('(Debugger) -> (Proxy) (Device): ' + message);
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const parsedMessage = JSON.parse(message);
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this._processMessageFromDebugger(parsedMessage, debuggerInfo);
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this._sendMessageToDevice({
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event: 'wrappedEvent',
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payload: {
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pageId: this._getPageId(pageId),
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wrappedEvent: JSON.stringify(parsedMessage),
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},
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});
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});
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socket.on('close', () => {
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debug(`Debugger for page ${pageId} and ${this._name} disconnected.`);
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this._sendMessageToDevice({
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event: 'disconnect',
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payload: {
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pageId: this._getPageId(pageId),
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},
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});
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this._debuggerConnection = null;
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});
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const sendFunc = socket.send;
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socket.send = function(message: string) {
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debug('(Debugger) <- (Proxy) (Device): ' + message);
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return sendFunc.call(socket, message);
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};
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}
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// Handles messages received from device:
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// 1. For getPages responses updates local _pages list.
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// 2. All other messages are forwarded to debugger as wrappedEvent.
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//
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// In the future more logic will be added to this method for modifying
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// some of the messages (like updating messages with source maps and file
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// locations).
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_handleMessageFromDevice(message: MessageFromDevice) {
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if (message.event === 'getPages') {
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this._pages = message.payload;
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// Check if device have new React Native page.
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// There is usually no more than 2-3 pages per device so this operation
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// is not expensive.
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// TODO(hypuk): It is better for VM to send update event when new page is
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// created instead of manually checking this on every getPages result.
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for (let i = 0; i < this._pages.length; ++i) {
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if (this._pages[i].title.indexOf('React') >= 0) {
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if (this._pages[i].id != this._lastReactNativePageId) {
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this._newReactNativePage(this._pages[i].id);
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break;
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}
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}
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}
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} else if (message.event === 'disconnect') {
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// Device sends disconnect events only when page is reloaded or
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// if debugger socket was disconnected.
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const pageId = message.payload.pageId;
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const debuggerSocket = this._debuggerConnection
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? this._debuggerConnection.socket
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: null;
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if (debuggerSocket && debuggerSocket.readyState === WS.OPEN) {
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if (
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this._debuggerConnection != null &&
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this._debuggerConnection.pageId !== REACT_NATIVE_RELOADABLE_PAGE.id
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) {
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debug(`Page ${pageId} is reloading.`);
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debuggerSocket.send(JSON.stringify({method: 'reload'}));
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}
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}
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} else if (message.event === 'wrappedEvent') {
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if (this._debuggerConnection == null) {
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return;
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}
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// FIXME: Is it possible that we received message for pageID that does not
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// correspond to current debugger connection?
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const debuggerSocket = this._debuggerConnection.socket;
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if (debuggerSocket == null || debuggerSocket.readyState !== WS.OPEN) {
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// TODO(hypuk): Send error back to device?
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return;
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}
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const parsedPayload = JSON.parse(message.payload.wrappedEvent);
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if (this._debuggerConnection) {
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// Wrapping just to make flow happy :)
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this._processMessageFromDevice(parsedPayload, this._debuggerConnection);
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}
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const messageToSend = JSON.stringify(parsedPayload);
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debuggerSocket.send(messageToSend);
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}
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}
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// Sends single message to device.
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_sendMessageToDevice(message: MessageToDevice) {
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try {
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if (message.event !== 'getPages') {
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debug('(Debugger) (Proxy) -> (Device): ' + JSON.stringify(message));
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}
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this._deviceSocket.send(JSON.stringify(message));
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} catch (error) {}
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}
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// Sends 'getPages' request to device every PAGES_POLLING_INTERVAL milliseconds.
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_setPagesPolling() {
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setInterval(
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() => this._sendMessageToDevice({event: 'getPages'}),
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PAGES_POLLING_INTERVAL,
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);
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}
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// We received new React Native Page ID.
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_newReactNativePage(pageId: string) {
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debug(`React Native page updated to ${pageId}`);
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if (
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this._debuggerConnection == null ||
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this._debuggerConnection.pageId !== REACT_NATIVE_RELOADABLE_PAGE.id
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) {
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// We can just remember new page ID without any further actions if no
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// debugger is currently attached or attached debugger is not
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// "Reloadable React Native" connection.
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this._lastReactNativePageId = pageId;
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return;
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}
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const oldPageId = this._lastReactNativePageId;
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this._lastReactNativePageId = pageId;
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this._isReloading = true;
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// We already had a debugger connected to React Native page and a
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// new one appeared - in this case we need to emulate execution context
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// detroy and resend Debugger.enable and Runtime.enable commands to new
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// page.
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if (oldPageId != null) {
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this._sendMessageToDevice({
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event: 'disconnect',
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payload: {
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pageId: oldPageId,
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},
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});
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}
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this._sendMessageToDevice({
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event: 'connect',
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payload: {
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pageId,
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},
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});
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const toSend = [
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{method: 'Runtime.enable', id: 1e9},
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{method: 'Debugger.enable', id: 1e9},
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];
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for (const message of toSend) {
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this._sendMessageToDevice({
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event: 'wrappedEvent',
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payload: {
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pageId: this._getPageId(pageId),
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wrappedEvent: JSON.stringify(message),
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},
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});
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}
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}
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// Allows to make changes in incoming message from device.
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// eslint-disable-next-line lint/no-unclear-flowtypes
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_processMessageFromDevice(payload: Object, debuggerInfo: DebuggerInfo) {
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// Replace Android addresses for scriptParsed event.
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if (payload.method === 'Debugger.scriptParsed') {
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const params = payload.params || {};
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if ('sourceMapURL' in params) {
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for (let i = 0; i < EMULATOR_LOCALHOST_ADDRESSES.length; ++i) {
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const address = EMULATOR_LOCALHOST_ADDRESSES[i];
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if (params.sourceMapURL.indexOf(address) >= 0) {
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payload.params.sourceMapURL = params.sourceMapURL.replace(
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address,
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'localhost',
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);
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debuggerInfo.originalSourceURLAddress = address;
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}
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}
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}
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if ('url' in params) {
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for (let i = 0; i < EMULATOR_LOCALHOST_ADDRESSES.length; ++i) {
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const address = EMULATOR_LOCALHOST_ADDRESSES[i];
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if (params.url.indexOf(address) >= 0) {
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payload.params.url = params.url.replace(address, 'localhost');
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debuggerInfo.originalSourceURLAddress = address;
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}
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}
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// Chrome doesn't download source maps if URL param is not a valid
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// URL. Some frameworks pass alphanumeric script ID instead of URL which causes
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// Chrome to not download source maps. In this case we want to prepend script ID
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// with 'file://' prefix.
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if (payload.params.url.match(/^[0-9a-z]+$/)) {
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payload.params.url = FILE_PREFIX + payload.params.url;
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debuggerInfo.prependedFilePrefix = true;
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}
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}
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if (debuggerInfo.pageId == REACT_NATIVE_RELOADABLE_PAGE.id) {
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// Chrome won't use the source map unless it appears to be new.
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payload.params.sourceMapURL +=
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'&cachePrevention=' + this._getPageId(debuggerInfo.pageId);
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payload.params.url +=
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'&cachePrevention=' + this._getPageId(debuggerInfo.pageId);
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}
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}
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if (
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payload.method === 'Runtime.executionContextCreated' &&
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this._isReloading
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) {
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// The new context is ready. First notify Chrome that we've reloaded so
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// it'll resend its breakpoints. If we do this earlier, we may not be
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// ready to receive them.
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debuggerInfo.socket.send(
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JSON.stringify({method: 'Runtime.executionContextsCleared'}),
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);
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// The VM starts in a paused mode. Ask it to resume.
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// Note that if setting breakpoints in early initialization functions,
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// there's a currently race condition between these functions executing
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// and Chrome re-applying the breakpoints due to the message above.
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//
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// This is not an issue in VSCode/Nuclide where the IDE knows to resume
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// at its convenience.
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this._sendMessageToDevice({
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event: 'wrappedEvent',
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payload: {
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pageId: this._getPageId(debuggerInfo.pageId),
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wrappedEvent: JSON.stringify({method: 'Debugger.resume', id: 0}),
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},
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});
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this._isReloading = false;
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}
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}
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// Allows to make changes in incoming messages from debugger.
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// eslint-disable-next-line lint/no-unclear-flowtypes
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_processMessageFromDebugger(payload: Object, debuggerInfo: DebuggerInfo) {
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// If we replaced Android emulator's address to localhost we need to change it back.
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if (
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payload.method === 'Debugger.setBreakpointByUrl' &&
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debuggerInfo.originalSourceURLAddress
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) {
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const params = payload.params || {};
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if ('url' in params) {
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payload.params.url = params.url.replace(
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'localhost',
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debuggerInfo.originalSourceURLAddress,
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);
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if (
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payload.params.url.startsWith(FILE_PREFIX) &&
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debuggerInfo.prependedFilePrefix
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) {
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// Remove fake URL prefix if we modified URL in _processMessageFromDevice.
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payload.params.url = payload.params.url.slice(FILE_PREFIX.length);
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}
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}
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if ('urlRegex' in params) {
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payload.params.urlRegex = params.urlRegex.replace(
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/localhost/g,
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debuggerInfo.originalSourceURLAddress,
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);
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}
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}
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}
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_getPageId(pageId: string): string {
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if (
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pageId === REACT_NATIVE_RELOADABLE_PAGE.id &&
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this._lastReactNativePageId != null
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) {
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return this._lastReactNativePageId;
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} else {
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return pageId;
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}
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}
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}
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module.exports = Device;
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