report: add PSI.prepareLabData()

lighthouse-core/report/html/renderer/psi.js

@@ -0,0 +1,76 @@
+/**
+ * @license
+ * Copyright 2018 Google Inc. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS-IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+'use strict';
+
+/* globals self DOM PerformanceCategoryRenderer Util DetailsRenderer */
+
+class PSI {
+  /**
+   * Returns all the elements that PSI needs to render the report
+   * We expose this helper method to minimize the 'public' API surface of the renderer
+   * and allow us to refactor without two-sided patches.
+   *
+   *   const {scoreGaugeEl, perfCategoryEl, finalScreenshotDataUri} = PSI.prepareLabData(
+   *      LHResultJsonString,
+   *      document
+   *   );
+   *
+   * @param {string} LHResultJsonString The stringified version of {LH.Result}
+   * @param {Document} document The host page's window.document
+   * @return {{scoreGaugeEl: Element, perfCategoryEl: Element, finalScreenshotDataUri: string|null}}
+   */
+  static prepareLabData(LHResultJsonString, document) {
+    const lhResult = /** @type {LH.Result} */ JSON.parse(LHResultJsonString);
+    const dom = new DOM(document);
+
+    const reportLHR = Util.prepareReportResult(lhResult);
+    const perfCategory = reportLHR.reportCategories.find(cat => cat.id === 'performance');
+    if (!perfCategory) throw new Error(`No performance category. Can't make lab data section`);
+    if (!reportLHR.categoryGroups) throw new Error(`No category groups found.`);
+
+    const perfRenderer = new PerformanceCategoryRenderer(dom, new DetailsRenderer(dom));
+    const perfCategoryEl = perfRenderer.render(perfCategory, reportLHR.categoryGroups);
+
+    const scoreGaugeEl = dom.find('.lh-score__gauge', perfCategoryEl);
+    const scoreGaugeWrapper = dom.find('.lh-gauge__wrapper', scoreGaugeEl);
+    scoreGaugeWrapper.classList.add('lh-gauge__wrapper--huge');
+    // Remove Performance category title/description
+    dom.find('.lh-category-header', perfCategoryEl).remove();
+    // Remove navigation links
+    scoreGaugeWrapper.removeAttribute('href');
+    dom.find('.lh-permalink', perfCategoryEl).remove();
+
+    const finalScreenshotDataUri = PSI.getFinalScreenshot(perfCategory);
+    return {scoreGaugeEl, perfCategoryEl, finalScreenshotDataUri};
+  }
+
+  /**
+   * @param {LH.ReportResult.Category} perfCategory
+   * @return {null|string}
+   */
+  static getFinalScreenshot(perfCategory) {
+    const auditRef = perfCategory.auditRefs.find(audit => audit.id === 'final-screenshot');
+    if (!auditRef || !auditRef.result || auditRef.result.scoreDisplayMode === 'error') return null;
+    return auditRef.result.details.data;
+  }
+}
+
+if (typeof module !== 'undefined' && module.exports) {
+  module.exports = PSI;
+} else {
+  self.PSI = PSI;
+}

lighthouse-core/report/html/renderer/util.js

@@ -377,18 +377,6 @@ class Util {
     ];
   }
 
-  /**
-   * @param {LH.ReportResult} result
-   * @return {null|string}
-   */
-  static getFinalScreenshot(result) {
-    const category = result.reportCategories.find(cat => cat.id === 'performance');
-    if (!category) return null;
-    const auditRef = category.auditRefs.find(audit => audit.id === 'final-screenshot');
-    if (!auditRef || !auditRef.result || auditRef.result.scoreDisplayMode === 'error') return null;
-    return auditRef.result.details.data;
-  }
-
   /**
    * @param {LH.Config.Settings} settings
    * @return {{deviceEmulation: string, networkThrottling: string, cpuThrottling: string, summary: string}}

lighthouse-core/test/report/html/renderer/psi-test.js

@@ -0,0 +1,111 @@
+/**
+ * @license Copyright 2017 Google Inc. All Rights Reserved.
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
+ */
+'use strict';
+
+const assert = require('assert');
+const fs = require('fs');
+const jsdom = require('jsdom');
+
+const PSI = require('../../../../report/html/renderer/psi.js');
+const Util = require('../../../../report/html/renderer/util.js');
+const DOM = require('../../../../report/html/renderer/dom.js');
+const CategoryRenderer = require('../../../../report/html/renderer/category-renderer');
+const DetailsRenderer = require('../../../../report/html/renderer/details-renderer');
+const CriticalRequestChainRenderer =
+    require('../../../../report/html/renderer/crc-details-renderer');
+
+const sampleResultsStr = fs.readFileSync(__dirname + '/../../../results/sample_v2.json', 'utf-8');
+const sampleResults = JSON.parse(sampleResultsStr)
+;
+const TEMPLATE_FILE = fs.readFileSync(
+  __dirname + '/../../../../report/html/templates.html',
+  'utf8'
+);
+
+/* eslint-env jest */
+
+describe('DOM', () => {
+  let document;
+  beforeAll(() => {
+    global.Util = Util;
+    global.DOM = DOM;
+    global.CategoryRenderer = CategoryRenderer;
+    global.DetailsRenderer = DetailsRenderer;
+
+    // Delayed so that CategoryRenderer is in global scope
+    const PerformanceCategoryRenderer =
+        require('../../../../report/html/renderer/performance-category-renderer');
+    global.PerformanceCategoryRenderer = PerformanceCategoryRenderer;
+    global.CriticalRequestChainRenderer = CriticalRequestChainRenderer;
+
+    document = jsdom.jsdom(TEMPLATE_FILE);
+  });
+
+  afterAll(() => {
+    global.Util = undefined;
+    global.DOM = undefined;
+    global.CategoryRenderer = undefined;
+    global.DetailsRenderer = undefined;
+    global.PerformanceCategoryRenderer = undefined;
+    global.CriticalRequestChainRenderer = undefined;
+  });
+
+  describe('psi prepareLabData helpers', () => {
+    describe('prepareLabData', () => {
+      it('reports expected data', () => {
+        const result = PSI.prepareLabData(sampleResultsStr, document);
+        assert.ok(result.scoreGaugeEl instanceof document.defaultView.Element);
+        assert.ok(result.perfCategoryEl instanceof document.defaultView.Element);
+        assert.equal(typeof result.finalScreenshotDataUri, 'string');
+
+        assert.ok(result.finalScreenshotDataUri.startsWith('data:image/jpeg;base64,'));
+        assert.ok(result.scoreGaugeEl.outerHTML.includes('<style>'), 'score gauge comes with CSS');
+        assert.ok(result.scoreGaugeEl.outerHTML.includes('<svg'), 'score gauge comes with SVG');
+        assert.ok(result.perfCategoryEl.outerHTML.length > 50000, 'perfCategory HTML is populated');
+      });
+
+      it('throws if there is no perf category', () => {
+        const lhrWithoutPerf = JSON.parse(sampleResultsStr);
+        delete lhrWithoutPerf.categories.performance;
+        const lhrWithoutPerfStr = JSON.stringify(lhrWithoutPerf);
+
+        assert.throws(() => {
+          PSI.prepareLabData(lhrWithoutPerfStr, document);
+        }, /no performance category/i);
+      });
+
+      it('throws if there is no category groups', () => {
+        const lhrWithoutGroups = JSON.parse(sampleResultsStr);
+        delete lhrWithoutGroups.categoryGroups;
+        const lhrWithoutGroupsStr = JSON.stringify(lhrWithoutGroups);
+
+        assert.throws(() => {
+          PSI.prepareLabData(lhrWithoutGroupsStr, document);
+        }, /no category groups/i);
+      });
+    });
+  });
+
+  describe('getFinalScreenshot', () => {
+    it('gets a datauri as a string', () => {
+      const cloneResults = Util.prepareReportResult(sampleResults);
+      const perfCategory = cloneResults.reportCategories.find(cat => cat.id === 'performance');
+      const datauri = PSI.getFinalScreenshot(perfCategory);
+      assert.equal(typeof datauri, 'string');
+      assert.ok(datauri.startsWith('data:image/jpeg;base64,'));
+    });
+
+    it('returns null if there is no final-screenshot audit', () => {
+      const clonedResults = JSON.parse(JSON.stringify(sampleResults));
+      delete clonedResults.audits['final-screenshot'];
+      const lhrNoFinalSS = Util.prepareReportResult(clonedResults);
+      const perfCategory = lhrNoFinalSS.reportCategories.find(cat => cat.id === 'performance');
+
+      const datauri = PSI.getFinalScreenshot(perfCategory);
+      assert.equal(datauri, null);
+    });
+  });
+});

lighthouse-core/test/report/html/renderer/util-test.js

@@ -8,8 +8,6 @@
 const assert = require('assert');
 const Util = require('../../../../report/html/renderer/util.js');
 
-const sampleResults = require('../../../results/sample_v2.json');
-
 const NBSP = '\xa0';
 
 /* eslint-env jest */
@@ -166,31 +164,4 @@ describe('util helpers', () => {
     Util.formatDisplayValue(displayValue);
     assert.deepStrictEqual(displayValue, cloned, 'displayValue was mutated');
   });
-
-  describe('getFinalScreenshot', () => {
-    it('gets a datauri as a string', () => {
-      const cloneResults = Util.prepareReportResult(sampleResults);
-      const datauri = Util.getFinalScreenshot(cloneResults);
-      assert.equal(typeof datauri, 'string');
-      assert.ok(datauri.startsWith('data:image/jpeg;base64,'));
-    });
-
-    it('returns null if there is no perf category', () => {
-      const clonedResults = JSON.parse(JSON.stringify(sampleResults));
-      delete clonedResults.categories.performance;
-      const lhrWithoutPerf = Util.prepareReportResult(clonedResults);
-
-      const datauri = Util.getFinalScreenshot(lhrWithoutPerf);
-      assert.equal(datauri, null);
-    });
-
-    it('returns null if there is no final-screenshot audit', () => {
-      const clonedResults = JSON.parse(JSON.stringify(sampleResults));
-      delete clonedResults.audits['final-screenshot'];
-      const lhrNoFinalSS = Util.prepareReportResult(clonedResults);
-
-      const datauri = Util.getFinalScreenshot(lhrNoFinalSS);
-      assert.equal(datauri, null);
-    });
-  });
 });

typings/html-renderer.d.ts

@@ -12,6 +12,7 @@ import _PerformanceCategoryRenderer = require('../lighthouse-core/report/html/re
 import _ReportRenderer = require('../lighthouse-core/report/html/renderer/report-renderer.js');
 import _ReportUIFeatures = require('../lighthouse-core/report/html/renderer/report-ui-features.js');
 import _Util = require('../lighthouse-core/report/html/renderer/util.js');
+import _PSI = require('../lighthouse-core/report/html/renderer/psi.js');
 import _FileNamer = require('../lighthouse-core/lib/file-namer.js');
 
 declare global {
@@ -24,6 +25,7 @@ declare global {
   var ReportRenderer: typeof _ReportRenderer;
   var ReportUIFeatures: typeof _ReportUIFeatures;
   var Util: typeof _Util;
+  var PSI: typeof _PSI;
 
   interface Window {
     CategoryRenderer: typeof _CategoryRenderer;
@@ -34,6 +36,7 @@ declare global {
     ReportRenderer: typeof _ReportRenderer;
     ReportUIFeatures: typeof _ReportUIFeatures;
     Util: typeof _Util;
+    PSI: typeof _PSI;
   }
 
   module LH {