refactor: move navigation management to FrameManager (#3266)

This patch:
- moves implementation of page.goto and page.waitForNavigation
  into FrameManager. The defaultNavigationTimeout gets moved to
  FrameManager as well.
- moves NavigatorWatcher into FrameManager to avoid circular dependency

References #2918

lib/FrameManager.js

@@ -19,6 +19,8 @@ const EventEmitter = require('events');
 const {helper, assert} = require('./helper');
 const {ExecutionContext} = require('./ExecutionContext');
 const {TimeoutError} = require('./Errors');
+const {NetworkManager} = require('./NetworkManager');
+const {Connection} = require('./Connection');
 
 const readFileAsync = helper.promisify(fs.readFile);
 
@@ -27,11 +29,14 @@ class FrameManager extends EventEmitter {
    * @param {!Puppeteer.CDPSession} client
    * @param {!Protocol.Page.FrameTree} frameTree
    * @param {!Puppeteer.Page} page
+   * @param {!Puppeteer.NetworkManager} networkManager
    */
-  constructor(client, frameTree, page) {
+  constructor(client, frameTree, page, networkManager) {
     super();
     this._client = client;
     this._page = page;
+    this._networkManager = networkManager;
+    this._defaultNavigationTimeout = 30000;
     /** @type {!Map<string, !Frame>} */
     this._frames = new Map();
     /** @type {!Map<number, !ExecutionContext>} */
@@ -50,6 +55,76 @@ class FrameManager extends EventEmitter {
     this._handleFrameTree(frameTree);
   }
 
+  /**
+   * @param {number} timeout
+   */
+  setDefaultNavigationTimeout(timeout) {
+    this._defaultNavigationTimeout = timeout;
+  }
+
+  /**
+   * @param {!Puppeteer.Frame} frame
+   * @param {string} url
+   * @param {!Object=} options
+   * @return {!Promise<?Puppeteer.Response>}
+   */
+  async navigateFrame(frame, url, options = {}) {
+    const referrer = typeof options.referer === 'string' ? options.referer : this._networkManager.extraHTTPHeaders()['referer'];
+
+    const timeout = typeof options.timeout === 'number' ? options.timeout : this._defaultNavigationTimeout;
+    const watcher = new NavigatorWatcher(this._client, this, this._networkManager, frame, timeout, options);
+    let ensureNewDocumentNavigation = false;
+    let error = await Promise.race([
+      navigate(this._client, url, referrer),
+      watcher.timeoutOrTerminationPromise(),
+    ]);
+    if (!error) {
+      error = await Promise.race([
+        watcher.timeoutOrTerminationPromise(),
+        ensureNewDocumentNavigation ? watcher.newDocumentNavigationPromise() : watcher.sameDocumentNavigationPromise(),
+      ]);
+    }
+    watcher.dispose();
+    if (error)
+      throw error;
+    return watcher.navigationResponse();
+
+    /**
+     * @param {!Puppeteer.CDPSession} client
+     * @param {string} url
+     * @param {string} referrer
+     * @return {!Promise<?Error>}
+     */
+    async function navigate(client, url, referrer) {
+      try {
+        const response = await client.send('Page.navigate', {url, referrer});
+        ensureNewDocumentNavigation = !!response.loaderId;
+        return response.errorText ? new Error(`${response.errorText} at ${url}`) : null;
+      } catch (error) {
+        return error;
+      }
+    }
+  }
+
+  /**
+   * @param {!Puppeteer.Frame} frame
+   * @param {!Object=} options
+   * @return {!Promise<?Puppeteer.Response>}
+   */
+  async waitForFrameNavigation(frame, options) {
+    const timeout = typeof options.timeout === 'number' ? options.timeout : this._defaultNavigationTimeout;
+    const watcher = new NavigatorWatcher(this._client, this, this._networkManager, frame, timeout, options);
+    const error = await Promise.race([
+      watcher.timeoutOrTerminationPromise(),
+      watcher.sameDocumentNavigationPromise(),
+      watcher.newDocumentNavigationPromise()
+    ]);
+    watcher.dispose();
+    if (error)
+      throw error;
+    return watcher.navigationResponse();
+  }
+
   /**
    * @param {!Protocol.Page.lifecycleEventPayload} event
    */
@@ -1017,4 +1092,165 @@ async function waitForPredicatePageFunction(predicateBody, polling, timeout, ...
   }
 }
 
+class NavigatorWatcher {
+  /**
+   * @param {!Puppeteer.CDPSession} client
+   * @param {!FrameManager} frameManager
+   * @param {!NetworkManager} networkManager
+   * @param {!Puppeteer.Frame} frame
+   * @param {number} timeout
+   * @param {!Object=} options
+   */
+  constructor(client, frameManager, networkManager, frame, timeout, options = {}) {
+    assert(options.networkIdleTimeout === undefined, 'ERROR: networkIdleTimeout option is no longer supported.');
+    assert(options.networkIdleInflight === undefined, 'ERROR: networkIdleInflight option is no longer supported.');
+    assert(options.waitUntil !== 'networkidle', 'ERROR: "networkidle" option is no longer supported. Use "networkidle2" instead');
+    let waitUntil = ['load'];
+    if (Array.isArray(options.waitUntil))
+      waitUntil = options.waitUntil.slice();
+    else if (typeof options.waitUntil === 'string')
+      waitUntil = [options.waitUntil];
+    this._expectedLifecycle = waitUntil.map(value => {
+      const protocolEvent = puppeteerToProtocolLifecycle[value];
+      assert(protocolEvent, 'Unknown value for options.waitUntil: ' + value);
+      return protocolEvent;
+    });
+
+    this._frameManager = frameManager;
+    this._networkManager = networkManager;
+    this._frame = frame;
+    this._initialLoaderId = frame._loaderId;
+    this._timeout = timeout;
+    /** @type {?Puppeteer.Request} */
+    this._navigationRequest = null;
+    this._hasSameDocumentNavigation = false;
+    this._eventListeners = [
+      helper.addEventListener(Connection.fromSession(client), Connection.Events.Disconnected, () => this._terminate(new Error('Navigation failed because browser has disconnected!'))),
+      helper.addEventListener(this._frameManager, FrameManager.Events.LifecycleEvent, this._checkLifecycleComplete.bind(this)),
+      helper.addEventListener(this._frameManager, FrameManager.Events.FrameNavigatedWithinDocument, this._navigatedWithinDocument.bind(this)),
+      helper.addEventListener(this._frameManager, FrameManager.Events.FrameDetached, this._checkLifecycleComplete.bind(this)),
+      helper.addEventListener(this._networkManager, NetworkManager.Events.Request, this._onRequest.bind(this)),
+    ];
+
+    this._sameDocumentNavigationPromise = new Promise(fulfill => {
+      this._sameDocumentNavigationCompleteCallback = fulfill;
+    });
+
+    this._newDocumentNavigationPromise = new Promise(fulfill => {
+      this._newDocumentNavigationCompleteCallback = fulfill;
+    });
+
+    this._timeoutPromise = this._createTimeoutPromise();
+    this._terminationPromise = new Promise(fulfill => {
+      this._terminationCallback = fulfill;
+    });
+  }
+
+  /**
+   * @param {!Puppeteer.Request} request
+   */
+  _onRequest(request) {
+    if (request.frame() !== this._frame || !request.isNavigationRequest())
+      return;
+    this._navigationRequest = request;
+  }
+
+  /**
+   * @return {?Puppeteer.Response}
+   */
+  navigationResponse() {
+    return this._navigationRequest ? this._navigationRequest.response() : null;
+  }
+
+  /**
+   * @param {!Error} error
+   */
+  _terminate(error) {
+    this._terminationCallback.call(null, error);
+  }
+
+  /**
+   * @return {!Promise<?Error>}
+   */
+  sameDocumentNavigationPromise() {
+    return this._sameDocumentNavigationPromise;
+  }
+
+  /**
+   * @return {!Promise<?Error>}
+   */
+  newDocumentNavigationPromise() {
+    return this._newDocumentNavigationPromise;
+  }
+
+  /**
+   * @return {!Promise<?Error>}
+   */
+  timeoutOrTerminationPromise() {
+    return Promise.race([this._timeoutPromise, this._terminationPromise]);
+  }
+
+  /**
+   * @return {!Promise<?Error>}
+   */
+  _createTimeoutPromise() {
+    if (!this._timeout)
+      return new Promise(() => {});
+    const errorMessage = 'Navigation Timeout Exceeded: ' + this._timeout + 'ms exceeded';
+    return new Promise(fulfill => this._maximumTimer = setTimeout(fulfill, this._timeout))
+        .then(() => new TimeoutError(errorMessage));
+  }
+
+  /**
+   * @param {!Puppeteer.Frame} frame
+   */
+  _navigatedWithinDocument(frame) {
+    if (frame !== this._frame)
+      return;
+    this._hasSameDocumentNavigation = true;
+    this._checkLifecycleComplete();
+  }
+
+  _checkLifecycleComplete() {
+    // We expect navigation to commit.
+    if (this._frame._loaderId === this._initialLoaderId && !this._hasSameDocumentNavigation)
+      return;
+    if (!checkLifecycle(this._frame, this._expectedLifecycle))
+      return;
+    if (this._hasSameDocumentNavigation)
+      this._sameDocumentNavigationCompleteCallback();
+    if (this._frame._loaderId !== this._initialLoaderId)
+      this._newDocumentNavigationCompleteCallback();
+
+    /**
+     * @param {!Puppeteer.Frame} frame
+     * @param {!Array<string>} expectedLifecycle
+     * @return {boolean}
+     */
+    function checkLifecycle(frame, expectedLifecycle) {
+      for (const event of expectedLifecycle) {
+        if (!frame._lifecycleEvents.has(event))
+          return false;
+      }
+      for (const child of frame.childFrames()) {
+        if (!checkLifecycle(child, expectedLifecycle))
+          return false;
+      }
+      return true;
+    }
+  }
+
+  dispose() {
+    helper.removeEventListeners(this._eventListeners);
+    clearTimeout(this._maximumTimer);
+  }
+}
+
+const puppeteerToProtocolLifecycle = {
+  'load': 'load',
+  'domcontentloaded': 'DOMContentLoaded',
+  'networkidle0': 'networkIdle',
+  'networkidle2': 'networkAlmostIdle',
+};
+
 module.exports = {FrameManager, Frame};