front_end/resources/ServiceWorkersView.js

// Copyright (c) 2015 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.

import * as Common from '../common/common.js';
import * as Components from '../components/components.js';
import * as MobileThrottling from '../mobile_throttling/mobile_throttling.js';
import * as SDK from '../sdk/sdk.js';
import * as UI from '../ui/ui.js';

/**
 * @implements {SDK.SDKModel.SDKModelObserver<!SDK.ServiceWorkerManager.ServiceWorkerManager>}
 */
export class ServiceWorkersView extends UI.Widget.VBox {
  constructor() {
    super(true);
    this.registerRequiredCSS('resources/serviceWorkersView.css');

    this._currentWorkersView = new UI.ReportView.ReportView(Common.UIString.UIString('Service Workers'));
    this._currentWorkersView.setBodyScrollable(false);
    this.contentElement.classList.add('service-worker-list');
    this._currentWorkersView.show(this.contentElement);
    this._currentWorkersView.element.classList.add('service-workers-this-origin');

    this._toolbar = this._currentWorkersView.createToolbar();
    this._toolbar.makeWrappable(true /* growVertically */);

    /** @type {!Map<!SDK.ServiceWorkerManager.ServiceWorkerRegistration, !Section>} */
    this._sections = new Map();
    /** @type {symbol} */
    this._registrationSymbol = Symbol('Resources.ServiceWorkersView');

    /** @type {?SDK.ServiceWorkerManager.ServiceWorkerManager} */
    this._manager = null;
    /** @type {?SDK.SecurityOriginManager.SecurityOriginManager} */
    this._securityOriginManager = null;

    this._filterThrottler = new Common.Throttler.Throttler(300);

    this._otherWorkers = this.contentElement.createChild('div', 'service-workers-other-origin');
    this._otherSWFilter = this._otherWorkers.createChild('div', 'service-worker-filter');
    this._otherSWFilter.setAttribute('tabindex', 0);
    this._otherSWFilter.setAttribute('role', 'switch');
    this._otherSWFilter.setAttribute('aria-checked', false);
    const filterLabel = this._otherSWFilter.createChild('label', 'service-worker-filter-label');
    filterLabel.textContent = Common.UIString.UIString('Service workers from other origins');
    self.onInvokeElement(this._otherSWFilter, event => {
      if (event.target === this._otherSWFilter || event.target === filterLabel) {
        this._toggleFilter();
      }
    });

    const toolbar = new UI.Toolbar.Toolbar('service-worker-filter-toolbar', this._otherSWFilter);
    this._filter = new UI.Toolbar.ToolbarInput(ls`Filter service worker`, '', 1);
    this._filter.addEventListener(UI.Toolbar.ToolbarInput.Event.TextChanged, () => this._filterChanged());
    toolbar.appendToolbarItem(this._filter);

    this._otherWorkersView = new UI.ReportView.ReportView();
    this._otherWorkersView.setBodyScrollable(false);
    this._otherWorkersView.show(this._otherWorkers);
    this._otherWorkersView.element.classList.add('service-workers-for-other-origins');

    this._updateCollapsedStyle();

    this._toolbar.appendToolbarItem(
        MobileThrottling.ThrottlingManager.throttlingManager().createOfflineToolbarCheckbox());
    const updateOnReloadSetting = self.Common.settings.createSetting('serviceWorkerUpdateOnReload', false);
    updateOnReloadSetting.setTitle(Common.UIString.UIString('Update on reload'));
    const forceUpdate = new UI.Toolbar.ToolbarSettingCheckbox(
        updateOnReloadSetting, ls`On page reload, force the service worker to update, and activate it`);
    this._toolbar.appendToolbarItem(forceUpdate);
    const bypassServiceWorkerSetting = self.Common.settings.createSetting('bypassServiceWorker', false);
    bypassServiceWorkerSetting.setTitle(Common.UIString.UIString('Bypass for network'));
    const fallbackToNetwork = new UI.Toolbar.ToolbarSettingCheckbox(
        bypassServiceWorkerSetting, ls`Bypass the service worker and load resources from the network`);
    this._toolbar.appendToolbarItem(fallbackToNetwork);

    /** @type {!Map<!SDK.ServiceWorkerManager.ServiceWorkerManager, !Array<!Common.EventTarget.EventDescriptor>>}*/
    this._eventListeners = new Map();
    SDK.SDKModel.TargetManager.instance().observeModels(SDK.ServiceWorkerManager.ServiceWorkerManager, this);
    this._updateListVisibility();
  }

  /**
   * @override
   * @param {!SDK.ServiceWorkerManager.ServiceWorkerManager} serviceWorkerManager
   */
  modelAdded(serviceWorkerManager) {
    if (this._manager) {
      return;
    }
    this._manager = serviceWorkerManager;
    this._securityOriginManager = serviceWorkerManager.target().model(SDK.SecurityOriginManager.SecurityOriginManager);

    for (const registration of this._manager.registrations().values()) {
      this._updateRegistration(registration);
    }

    this._eventListeners.set(serviceWorkerManager, [
      this._manager.addEventListener(
          SDK.ServiceWorkerManager.Events.RegistrationUpdated, this._registrationUpdated, this),
      this._manager.addEventListener(
          SDK.ServiceWorkerManager.Events.RegistrationDeleted, this._registrationDeleted, this),
      this._securityOriginManager.addEventListener(
          SDK.SecurityOriginManager.Events.SecurityOriginAdded, this._updateSectionVisibility, this),
      this._securityOriginManager.addEventListener(
          SDK.SecurityOriginManager.Events.SecurityOriginRemoved, this._updateSectionVisibility, this),
    ]);
  }

  /**
   * @override
   * @param {!SDK.ServiceWorkerManager.ServiceWorkerManager} serviceWorkerManager
   */
  modelRemoved(serviceWorkerManager) {
    if (!this._manager || this._manager !== serviceWorkerManager) {
      return;
    }

    Common.EventTarget.EventTarget.removeEventListeners(this._eventListeners.get(serviceWorkerManager));
    this._eventListeners.delete(serviceWorkerManager);
    this._manager = null;
    this._securityOriginManager = null;
  }


  /**
   * @param {!SDK.ServiceWorkerManager.ServiceWorkerRegistration} registration
   * @return {number}
   */
  _getTimeStamp(registration) {
    const versions = registration.versionsByMode();

    let timestamp = 0;

    const active = versions.get(SDK.ServiceWorkerManager.ServiceWorkerVersion.Modes.Active);
    const installing = versions.get(SDK.ServiceWorkerManager.ServiceWorkerVersion.Modes.Installing);
    const waiting = versions.get(SDK.ServiceWorkerManager.ServiceWorkerVersion.Modes.Waiting);
    const redundant = versions.get(SDK.ServiceWorkerManager.ServiceWorkerVersion.Modes.Redundant);

    if (active) {
      timestamp = active.scriptResponseTime;
    } else if (waiting) {
      timestamp = waiting.scriptResponseTime;
    } else if (installing) {
      timestamp = installing.scriptResponseTime;
    } else if (redundant) {
      timestamp = redundant.scriptResponseTime;
    }

    return timestamp;
  }

  _updateSectionVisibility() {
    let hasOthers = false;
    let hasThis = false;
    const movedSections = [];
    for (const section of this._sections.values()) {
      const expectedView = this._getReportViewForOrigin(section._registration.securityOrigin);
      hasOthers |= expectedView === this._otherWorkersView;
      hasThis |= expectedView === this._currentWorkersView;
      if (section._section.parentWidget() !== expectedView) {
        movedSections.push(section);
      }
    }

    for (const section of movedSections) {
      const registration = section._registration;
      this._removeRegistrationFromList(registration);
      this._updateRegistration(registration, true);
    }

    this._currentWorkersView.sortSections((a, b) => {
      const aTimestamp = this._getTimeStamp(a[this._registrationSymbol]);
      const bTimestamp = this._getTimeStamp(b[this._registrationSymbol]);
      // the newest (largest timestamp value) should be the first
      return bTimestamp - aTimestamp;
    });

    const scorer = new Sources.FilePathScoreFunction(this._filter.value());
    this._otherWorkersView.sortSections((a, b) => {
      const cmp = scorer.score(b.title(), null) - scorer.score(a.title(), null);
      return cmp === 0 ? a.title().localeCompare(b.title()) : cmp;
    });
    for (const section of this._sections.values()) {
      if (section._section.parentWidget() === this._currentWorkersView ||
          this._isRegistrationVisible(section._registration)) {
        section._section.showWidget();
      } else {
        section._section.hideWidget();
      }
    }
    this.contentElement.classList.toggle('service-worker-has-current', !!hasThis);
    this._otherWorkers.classList.toggle('hidden', !hasOthers);
    this._updateListVisibility();
  }

  /**
   * @param {!Common.EventTarget.EventTargetEvent} event
   */
  _registrationUpdated(event) {
    const registration = /** @type {!SDK.ServiceWorkerManager.ServiceWorkerRegistration} */ (event.data);
    this._updateRegistration(registration);
    this._gcRegistrations();
  }

  _gcRegistrations() {
    let hasNonDeletedRegistrations = false;
    const securityOrigins = new Set(this._securityOriginManager.securityOrigins());
    for (const registration of this._manager.registrations().values()) {
      if (!securityOrigins.has(registration.securityOrigin) && !this._isRegistrationVisible(registration)) {
        continue;
      }
      if (!registration.canBeRemoved()) {
        hasNonDeletedRegistrations = true;
        break;
      }
    }

    if (!hasNonDeletedRegistrations) {
      return;
    }

    for (const registration of this._manager.registrations().values()) {
      const visible = securityOrigins.has(registration.securityOrigin) || this._isRegistrationVisible(registration);
      if (!visible && registration.canBeRemoved()) {
        this._removeRegistrationFromList(registration);
      }
    }
  }

  /**
   * @param {string} origin
   * @return {!UI.ReportView.ReportView}
   */
  _getReportViewForOrigin(origin) {
    if (this._securityOriginManager.securityOrigins().includes(origin) ||
        this._securityOriginManager.unreachableMainSecurityOrigin() === origin) {
      return this._currentWorkersView;
    }
    return this._otherWorkersView;
  }

  /**
   * @param {!SDK.ServiceWorkerManager.ServiceWorkerRegistration} registration
   * @param {boolean=} skipUpdate
   */
  _updateRegistration(registration, skipUpdate) {
    let section = this._sections.get(registration);
    if (!section) {
      const title = registration.scopeURL;
      const uiSection = this._getReportViewForOrigin(registration.securityOrigin).appendSection(title);
      uiSection.setUiGroupTitle(ls`Service worker for ${title}`);
      uiSection[this._registrationSymbol] = registration;
      section = new Section(
          /** @type {!SDK.ServiceWorkerManager.ServiceWorkerManager} */ (this._manager), uiSection, registration);
      this._sections.set(registration, section);
    }
    if (skipUpdate) {
      return;
    }
    this._updateSectionVisibility();
    section._scheduleUpdate();
  }

  /**
   * @param {!Common.EventTarget.EventTargetEvent} event
   */
  _registrationDeleted(event) {
    const registration = /** @type {!SDK.ServiceWorkerManager.ServiceWorkerRegistration} */ (event.data);
    this._removeRegistrationFromList(registration);
  }

  /**
   * @param {!SDK.ServiceWorkerManager.ServiceWorkerRegistration} registration
   */
  _removeRegistrationFromList(registration) {
    const section = this._sections.get(registration);
    if (section) {
      section._section.detach();
    }
    this._sections.delete(registration);
    this._updateSectionVisibility();
  }

  /**
   * @param {!SDK.ServiceWorkerManager.ServiceWorkerRegistration} registration
   * @return {boolean}
   */
  _isRegistrationVisible(registration) {
    const filterString = this._filter.value();
    if (!filterString || !registration.scopeURL) {
      return true;
    }

    const regex = String.filterRegex(filterString);
    return registration.scopeURL.match(regex);
  }

  _filterChanged() {
    this._updateCollapsedStyle();
    this._filterThrottler.schedule(() => Promise.resolve(this._updateSectionVisibility()));
  }

  _updateCollapsedStyle() {
    const expanded = this._otherSWFilter.getAttribute('aria-checked') === 'true';
    this._otherWorkers.classList.toggle('service-worker-filter-collapsed', !expanded);
    if (expanded) {
      this._otherWorkersView.showWidget();
    } else {
      this._otherWorkersView.hideWidget();
    }
    this._otherWorkersView.setHeaderVisible(false);
  }

  _updateListVisibility() {
    this.contentElement.classList.toggle('service-worker-list-empty', this._sections.size === 0);
  }

  _toggleFilter() {
    const expanded = this._otherSWFilter.getAttribute('aria-checked') === 'true';
    this._otherSWFilter.setAttribute('aria-checked', !expanded);
    this._filterChanged();
  }
}

export class Section {
  /**
   * @param {!SDK.ServiceWorkerManager.ServiceWorkerManager} manager
   * @param {!UI.ReportView.Section} section
   * @param {!SDK.ServiceWorkerManager.ServiceWorkerRegistration} registration
   */
  constructor(manager, section, registration) {
    this._manager = manager;
    this._section = section;
    this._registration = registration;
    /** @type {?symbol} */
    this._fingerprint = null;
    this._pushNotificationDataSetting = self.Common.settings.createLocalSetting(
        'pushData', Common.UIString.UIString('Test push message from DevTools.'));
    this._syncTagNameSetting = self.Common.settings.createLocalSetting('syncTagName', 'test-tag-from-devtools');
    this._periodicSyncTagNameSetting =
        self.Common.settings.createLocalSetting('periodicSyncTagName', 'test-tag-from-devtools');

    this._toolbar = section.createToolbar();
    this._toolbar.renderAsLinks();
    this._updateButton =
        new UI.Toolbar.ToolbarButton(Common.UIString.UIString('Update'), undefined, Common.UIString.UIString('Update'));
    this._updateButton.addEventListener(UI.Toolbar.ToolbarButton.Events.Click, this._updateButtonClicked, this);
    this._toolbar.appendToolbarItem(this._updateButton);
    this._deleteButton = new UI.Toolbar.ToolbarButton(
        Common.UIString.UIString('Unregister service worker'), undefined, Common.UIString.UIString('Unregister'));
    this._deleteButton.addEventListener(UI.Toolbar.ToolbarButton.Events.Click, this._unregisterButtonClicked, this);
    this._toolbar.appendToolbarItem(this._deleteButton);

    // Preserve the order.
    this._sourceField = this._wrapWidget(this._section.appendField(Common.UIString.UIString('Source')));
    this._statusField = this._wrapWidget(this._section.appendField(Common.UIString.UIString('Status')));
    this._clientsField = this._wrapWidget(this._section.appendField(Common.UIString.UIString('Clients')));
    this._createSyncNotificationField(
        Common.UIString.UIString('Push'), this._pushNotificationDataSetting.get(),
        Common.UIString.UIString('Push data'), this._push.bind(this));
    this._createSyncNotificationField(
        Common.UIString.UIString('Sync'), this._syncTagNameSetting.get(), Common.UIString.UIString('Sync tag'),
        this._sync.bind(this));
    this._createSyncNotificationField(
        ls`Periodic Sync`, this._periodicSyncTagNameSetting.get(), ls`Periodic Sync tag`,
        tag => this._periodicSync(tag));

    this._linkifier = new Components.Linkifier.Linkifier();
    /** @type {!Map<string, !Protocol.Target.TargetInfo>} */
    this._clientInfoCache = new Map();
    this._throttler = new Common.Throttler.Throttler(500);
  }

  /**
   * @param {string} label
   * @param {string} initialValue
   * @param {string} placeholder
   * @param {function(string)} callback
   */
  _createSyncNotificationField(label, initialValue, placeholder, callback) {
    const form =
        this._wrapWidget(this._section.appendField(label)).createChild('form', 'service-worker-editor-with-button');
    const editor = form.createChild('input', 'source-code service-worker-notification-editor');
    const button = UI.UIUtils.createTextButton(label);
    button.type = 'submit';
    form.appendChild(button);

    editor.value = initialValue;
    editor.placeholder = placeholder;
    UI.ARIAUtils.setAccessibleName(editor, label);

    form.addEventListener('submit', e => {
      callback(editor.value || '');
      e.consume(true);
    });
  }

  _scheduleUpdate() {
    if (ServiceWorkersView._noThrottle) {
      this._update();
      return;
    }
    this._throttler.schedule(this._update.bind(this));
  }

  /**
   * @param {string} versionId
   * @return {?SDK.SDKModel.Target}
   */
  _targetForVersionId(versionId) {
    const version = this._manager.findVersion(versionId);
    if (!version || !version.targetId) {
      return null;
    }
    return SDK.SDKModel.TargetManager.instance().targetById(version.targetId);
  }

  /**
   * @param {!Element} versionsStack
   * @param {string} icon
   * @param {string} label
   * @return {!Element}
   */
  _addVersion(versionsStack, icon, label) {
    const installingEntry = versionsStack.createChild('div', 'service-worker-version');
    installingEntry.createChild('div', icon);
    installingEntry.createChild('span').textContent = label;
    return installingEntry;
  }

  /**
   * @param {!SDK.ServiceWorkerManager.ServiceWorkerVersion} version
   */
  _updateClientsField(version) {
    this._clientsField.removeChildren();
    this._section.setFieldVisible(Common.UIString.UIString('Clients'), version.controlledClients.length);
    for (const client of version.controlledClients) {
      const clientLabelText = this._clientsField.createChild('div', 'service-worker-client');
      if (this._clientInfoCache.has(client)) {
        this._updateClientInfo(
            clientLabelText, /** @type {!Protocol.Target.TargetInfo} */ (this._clientInfoCache.get(client)));
      }
      this._manager.target().targetAgent().getTargetInfo(client).then(this._onClientInfo.bind(this, clientLabelText));
    }
  }

  /**
   * @param {!SDK.ServiceWorkerManager.ServiceWorkerVersion} version
   */
  _updateSourceField(version) {
    this._sourceField.removeChildren();
    const fileName = Common.ParsedURL.ParsedURL.extractName(version.scriptURL);
    const name = this._sourceField.createChild('div', 'report-field-value-filename');
    const link = Components.Linkifier.Linkifier.linkifyURL(version.scriptURL, {text: fileName});
    link.tabIndex = 0;
    name.appendChild(link);
    if (this._registration.errors.length) {
      const errorsLabel = UI.UIUtils.createIconLabel(String(this._registration.errors.length), 'smallicon-error');
      errorsLabel.classList.add('link');
      errorsLabel.tabIndex = 0;
      UI.ARIAUtils.setAccessibleName(errorsLabel, ls`${this._registration.errors.length} registration errors`);
      self.onInvokeElement(errorsLabel, () => Common.Console.Console.instance().show());
      name.appendChild(errorsLabel);
    }
    this._sourceField.createChild('div', 'report-field-value-subtitle').textContent =
        Common.UIString.UIString('Received %s', new Date(version.scriptResponseTime * 1000).toLocaleString());
  }

  /**
   * @return {!Promise}
   */
  _update() {
    const fingerprint = this._registration.fingerprint();
    if (fingerprint === this._fingerprint) {
      return Promise.resolve();
    }
    this._fingerprint = fingerprint;

    this._toolbar.setEnabled(!this._registration.isDeleted);

    const versions = this._registration.versionsByMode();
    const scopeURL = this._registration.scopeURL;
    const title = this._registration.isDeleted ? Common.UIString.UIString('%s - deleted', scopeURL) : scopeURL;
    this._section.setTitle(title);

    const active = versions.get(SDK.ServiceWorkerManager.ServiceWorkerVersion.Modes.Active);
    const waiting = versions.get(SDK.ServiceWorkerManager.ServiceWorkerVersion.Modes.Waiting);
    const installing = versions.get(SDK.ServiceWorkerManager.ServiceWorkerVersion.Modes.Installing);
    const redundant = versions.get(SDK.ServiceWorkerManager.ServiceWorkerVersion.Modes.Redundant);

    this._statusField.removeChildren();
    const versionsStack = this._statusField.createChild('div', 'service-worker-version-stack');
    versionsStack.createChild('div', 'service-worker-version-stack-bar');

    if (active) {
      this._updateSourceField(active);
      const localizedRunningStatus = SDK.ServiceWorkerManager.ServiceWorkerVersion.RunningStatus[active.runningStatus];
      const activeEntry = this._addVersion(
          versionsStack, 'service-worker-active-circle', ls`#${active.id} activated and is ${localizedRunningStatus}`);

      if (active.isRunning() || active.isStarting()) {
        this._createLink(activeEntry, Common.UIString.UIString('stop'), this._stopButtonClicked.bind(this, active.id));
        if (!this._targetForVersionId(active.id)) {
          this._createLink(
              activeEntry, Common.UIString.UIString('inspect'), this._inspectButtonClicked.bind(this, active.id));
        }
      } else if (active.isStartable()) {
        this._createLink(activeEntry, Common.UIString.UIString('start'), this._startButtonClicked.bind(this));
      }
      this._updateClientsField(active);
    } else if (redundant) {
      this._updateSourceField(redundant);
      this._addVersion(
          versionsStack, 'service-worker-redundant-circle', Common.UIString.UIString('#%s is redundant', redundant.id));
      this._updateClientsField(redundant);
    }

    if (waiting) {
      const waitingEntry = this._addVersion(
          versionsStack, 'service-worker-waiting-circle',
          Common.UIString.UIString('#%s waiting to activate', waiting.id));
      this._createLink(waitingEntry, Common.UIString.UIString('skipWaiting'), this._skipButtonClicked.bind(this));
      waitingEntry.createChild('div', 'service-worker-subtitle').textContent =
          Common.UIString.UIString('Received %s', new Date(waiting.scriptResponseTime * 1000).toLocaleString());
      if (!this._targetForVersionId(waiting.id) && (waiting.isRunning() || waiting.isStarting())) {
        this._createLink(
            waitingEntry, Common.UIString.UIString('inspect'), this._inspectButtonClicked.bind(this, waiting.id));
      }
    }
    if (installing) {
      const installingEntry = this._addVersion(
          versionsStack, 'service-worker-installing-circle',
          Common.UIString.UIString('#%s trying to install', installing.id));
      installingEntry.createChild('div', 'service-worker-subtitle').textContent =
          Common.UIString.UIString('Received %s', new Date(installing.scriptResponseTime * 1000).toLocaleString());
      if (!this._targetForVersionId(installing.id) && (installing.isRunning() || installing.isStarting())) {
        this._createLink(
            installingEntry, Common.UIString.UIString('inspect'), this._inspectButtonClicked.bind(this, installing.id));
      }
    }
    return Promise.resolve();
  }

  /**
   * @param {!Element} parent
   * @param {string} title
   * @param {function()} listener
   * @param {string=} className
   * @param {boolean=} useCapture
   * @return {!Element}
   */
  _createLink(parent, title, listener, className, useCapture) {
    const button = parent.createChild('button', className);
    button.classList.add('link');
    button.textContent = title;
    button.tabIndex = 0;
    button.addEventListener('click', listener, useCapture);
    return button;
  }

  /**
   * @param {!Common.EventTarget.EventTargetEvent} event
   */
  _unregisterButtonClicked(event) {
    this._manager.deleteRegistration(this._registration.id);
  }

  /**
   * @param {!Common.EventTarget.EventTargetEvent} event
   */
  _updateButtonClicked(event) {
    this._manager.updateRegistration(this._registration.id);
  }

  /**
   * @param {string} data
   */
  _push(data) {
    this._pushNotificationDataSetting.set(data);
    this._manager.deliverPushMessage(this._registration.id, data);
  }

  /**
   * @param {string} tag
   */
  _sync(tag) {
    this._syncTagNameSetting.set(tag);
    this._manager.dispatchSyncEvent(this._registration.id, tag, true);
  }

  /**
   * @param {string} tag
   */
  _periodicSync(tag) {
    this._periodicSyncTagNameSetting.set(tag);
    this._manager.dispatchPeriodicSyncEvent(this._registration.id, tag);
  }

  /**
   * @param {!Element} element
   * @param {?Protocol.Target.TargetInfo} targetInfo
   */
  _onClientInfo(element, targetInfo) {
    if (!targetInfo) {
      return;
    }
    this._clientInfoCache.set(targetInfo.targetId, targetInfo);
    this._updateClientInfo(element, targetInfo);
  }

  /**
   * @param {!Element} element
   * @param {!Protocol.Target.TargetInfo} targetInfo
   */
  _updateClientInfo(element, targetInfo) {
    if (targetInfo.type !== 'page' && targetInfo.type === 'iframe') {
      const clientString = element.createChild('span', 'service-worker-client-string');
      clientString.createTextChild(ls`Worker: ${targetInfo.url}`);
      return;
    }
    element.removeChildren();
    const clientString = element.createChild('span', 'service-worker-client-string');
    clientString.createTextChild(targetInfo.url);
    this._createLink(
        element, ls`focus`, this._activateTarget.bind(this, targetInfo.targetId), 'service-worker-client-focus-link');
  }

  /**
   * @param {string} targetId
   */
  _activateTarget(targetId) {
    this._manager.target().targetAgent().activateTarget(targetId);
  }

  _startButtonClicked() {
    this._manager.startWorker(this._registration.scopeURL);
  }

  _skipButtonClicked() {
    this._manager.skipWaiting(this._registration.scopeURL);
  }

  /**
   * @param {string} versionId
   */
  _stopButtonClicked(versionId) {
    this._manager.stopWorker(versionId);
  }

  /**
   * @param {string} versionId
   */
  _inspectButtonClicked(versionId) {
    this._manager.inspectWorker(versionId);
  }

  /**
   * @param {!Element} container
   * @return {!Element}
   */
  _wrapWidget(container) {
    const shadowRoot = UI.Utils.createShadowRootWithCoreStyles(container);
    UI.Utils.appendStyle(shadowRoot, 'resources/serviceWorkersView.css');
    const contentElement = createElement('div');
    shadowRoot.appendChild(contentElement);
    return contentElement;
  }
}