Mohamed Boudra
c7b103a2cd
Keep diff headers and painted content on the same scroll clock while preserving native scrolling and independent per-file horizontal offsets. Complete review, selection, typography, tree, and palette parity without returning line rendering to React.
540 lines
20 KiB
TypeScript
540 lines
20 KiB
TypeScript
import { writeFile } from "node:fs/promises";
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import path from "node:path";
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import type { CDPSession, Locator, Page, TestInfo } from "@playwright/test";
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import { buildHostWorkspaceRoute } from "../../src/utils/host-routes";
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import { test, expect } from "../support/fixtures";
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import { getServerId } from "../support/helpers/server-id";
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import { connectSeedClient } from "../support/helpers/seed-client";
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import { createTempGitRepo } from "../support/helpers/workspace";
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import { openChangesPanel, waitForWorkspaceTabsVisible } from "../support/helpers/workspace-tabs";
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import { DIFF_POC_BASELINE } from "./diff-performance-baseline";
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const RUN_DIFF_PERF = process.env.PASEO_DIFF_PERF_E2E === "1";
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const diffPerfDescribe = RUN_DIFF_PERF ? test.describe : test.describe.skip;
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const LINE_COUNT_PER_FILE = 1_200;
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const FILE_PATHS = ["src/large-a.ts", "src/large-b.ts"] as const;
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const CPU_SLOWDOWN = Number(process.env.PASEO_DIFF_PERF_CPU_SLOWDOWN ?? 6);
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const CHANGES_PREFERENCES_KEY = "@paseo:changes-preferences";
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const POC_MEDIAN_FRAME_MS = Number(
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process.env.PASEO_DIFF_POC_MEDIAN_FRAME_MS ?? DIFF_POC_BASELINE.medianFrameMs,
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);
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const POC_P95_FRAME_MS = Number(
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process.env.PASEO_DIFF_POC_P95_FRAME_MS ?? DIFF_POC_BASELINE.p95FrameMs,
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);
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const MAX_MEDIAN_FRAME_MS = POC_MEDIAN_FRAME_MS * 1.1;
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const MAX_P95_FRAME_MS = POC_P95_FRAME_MS * 1.1;
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diffPerfDescribe("Diff canvas performance", () => {
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test("one canvas stays filled through continuous fast scrolling", async ({ page }, testInfo) => {
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test.setTimeout(180_000);
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const repo = await createLargeDiffRepository();
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const client = await connectSeedClient();
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let cdp: CDPSession | null = null;
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let traceStarted = false;
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try {
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const created = await client.createWorkspace({
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source: { kind: "directory", path: repo.path },
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});
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if (!created.workspace) {
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throw new Error(created.error ?? "Failed to create diff performance workspace");
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}
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await configureUnwrappedUnifiedDiff(page);
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await page.setViewportSize({ width: 1400, height: 900 });
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await page.goto(buildHostWorkspaceRoute(getServerId(), created.workspace.id));
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await waitForWorkspaceTabsVisible(page);
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await page.getByRole("button", { name: "Open explorer" }).click();
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await expect(page.getByTestId("git-diff-canvas")).toBeVisible({ timeout: 30_000 });
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await expectSingleCanvasSurface(page);
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cdp = await page.context().newCDPSession(page);
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await cdp.send("Emulation.setCPUThrottlingRate", { rate: CPU_SLOWDOWN });
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await startChromiumTrace(cdp);
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traceStarted = true;
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await startRendererInstrumentation(page);
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const scrollReports = [];
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const heapUsage = [];
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for (let cycle = 0; cycle < 3; cycle += 1) {
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scrollReports.push(await continuouslyScrollCanvas(page));
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heapUsage.push(await collectHeapUsage(cdp));
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}
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await expectContinuousFramesMatchStableRender(
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page,
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scrollReports.flatMap((report) => report.frameSignatures),
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);
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const frameImages = await captureCanvasAtScrollIntervals(page);
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for (const [frameIndex, frame] of frameImages.entries()) {
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await writeFile(testInfo.outputPath(`diff-canvas-frame-${frameIndex}.png`), frame.image);
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await testInfo.attach(`diff-canvas-frame-${frameIndex}`, {
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body: frame.image,
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contentType: "image/png",
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});
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expect(frame.image.byteLength).toBeGreaterThan(4_000);
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}
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await expectIndependentHorizontalOffsetsSurviveVerticalScrolling(page);
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const renderer = await readRendererInstrumentation(page);
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const measuredCycles = scrollReports.slice(1);
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expect(Math.max(...measuredCycles.map((cycle) => cycle.medianFrameMs))).toBeLessThanOrEqual(
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MAX_MEDIAN_FRAME_MS,
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);
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expect(Math.max(...measuredCycles.map((cycle) => cycle.p95FrameMs))).toBeLessThanOrEqual(
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MAX_P95_FRAME_MS,
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);
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for (const cycle of scrollReports) {
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expect(Math.abs(cycle.maximumScrollTop - cycle.endScrollTop)).toBeLessThanOrEqual(1);
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}
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expect(heapUsage.at(-1)!.usedSize).toBeLessThanOrEqual(
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heapUsage[0]!.usedSize * 1.1 + 1_000_000,
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);
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expect(renderer.addedElements).toBe(0);
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expect(renderer.removedElements).toBe(0);
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expect(renderer.reactCommits).toBeLessThanOrEqual(2);
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await reloadDiffPresentation(page, { layout: "unified", wrapLines: true });
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const wrapped = await measureAdditionalPerformanceScenario(page, cdp, testInfo, "wrapped");
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await reloadDiffPresentation(page, { layout: "split", wrapLines: false });
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const split = await measureAdditionalPerformanceScenario(page, cdp, testInfo, "split");
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const report = {
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cpuSlowdown: CPU_SLOWDOWN,
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pocBaseline: {
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medianFrameMs: POC_MEDIAN_FRAME_MS,
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p95FrameMs: POC_P95_FRAME_MS,
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},
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sourceFiles: FILE_PATHS.length,
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sourceLines: FILE_PATHS.length * LINE_COUNT_PER_FILE,
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scrollReports,
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heapUsage,
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renderer,
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wrapped,
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split,
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canvasPngBytes: frameImages.map((frame) => frame.image.byteLength),
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};
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await attachPerformanceReport(testInfo, report);
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await stopChromiumTrace(cdp, testInfo);
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traceStarted = false;
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await cdp.send("Emulation.setCPUThrottlingRate", { rate: 1 });
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} finally {
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if (cdp && traceStarted) {
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await stopChromiumTrace(cdp, testInfo).catch(() => undefined);
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}
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await cdp?.send("Emulation.setCPUThrottlingRate", { rate: 1 }).catch(() => undefined);
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await cdp?.detach().catch(() => undefined);
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await client.close().catch(() => undefined);
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await repo.cleanup().catch(() => undefined);
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}
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});
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});
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async function measureAdditionalPerformanceScenario(
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page: Page,
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cdp: CDPSession,
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testInfo: TestInfo,
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name: "wrapped" | "split",
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) {
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await expectSingleCanvasSurface(page);
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await startRendererInstrumentation(page);
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const scrollReports = [];
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const heapUsage = [];
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for (let cycle = 0; cycle < 3; cycle += 1) {
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scrollReports.push(await continuouslyScrollCanvas(page));
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heapUsage.push(await collectHeapUsage(cdp));
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}
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await expectContinuousFramesMatchStableRender(
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page,
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scrollReports.flatMap((report) => report.frameSignatures),
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);
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const frames = await captureCanvasAtScrollIntervals(page);
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for (const [index, frame] of frames.entries()) {
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await writeFile(testInfo.outputPath(`diff-canvas-${name}-frame-${index}.png`), frame.image);
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await testInfo.attach(`diff-canvas-${name}-frame-${index}`, {
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body: frame.image,
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contentType: "image/png",
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});
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expect(frame.image.byteLength).toBeGreaterThan(4_000);
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}
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const measuredCycles = scrollReports.slice(1);
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expect(Math.max(...measuredCycles.map((cycle) => cycle.medianFrameMs))).toBeLessThanOrEqual(
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MAX_MEDIAN_FRAME_MS,
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);
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expect(Math.max(...measuredCycles.map((cycle) => cycle.p95FrameMs))).toBeLessThanOrEqual(
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MAX_P95_FRAME_MS,
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);
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for (const cycle of scrollReports) {
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expect(Math.abs(cycle.maximumScrollTop - cycle.endScrollTop)).toBeLessThanOrEqual(1);
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}
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expect(heapUsage.at(-1)!.usedSize).toBeLessThanOrEqual(heapUsage[0]!.usedSize * 1.1 + 1_000_000);
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const renderer = await readRendererInstrumentation(page);
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expect(renderer.addedElements).toBe(0);
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expect(renderer.removedElements).toBe(0);
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expect(renderer.reactCommits).toBeLessThanOrEqual(2);
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return {
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scrollReports,
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heapUsage,
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renderer,
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canvasPngBytes: frames.map((frame) => frame.image.byteLength),
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};
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}
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async function reloadDiffPresentation(
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page: Page,
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requestedPresentation: { layout: "unified" | "split"; wrapLines: boolean },
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): Promise<void> {
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await page.evaluate(
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({ preferencesKey, presentation }) => {
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const current = JSON.parse(localStorage.getItem(preferencesKey) ?? "{}") as object;
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localStorage.setItem(preferencesKey, JSON.stringify({ ...current, ...presentation }));
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},
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{ preferencesKey: CHANGES_PREFERENCES_KEY, presentation: requestedPresentation },
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);
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await page.reload();
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await waitForWorkspaceTabsVisible(page);
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await openChangesPanel(page);
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await expect(page.getByTestId("git-diff-canvas")).toBeVisible({ timeout: 30_000 });
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}
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async function createLargeDiffRepository() {
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const repo = await createTempGitRepo("diff-perf-", {
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files: FILE_PATHS.map((filePath, fileIndex) => ({
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path: filePath,
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content: `export const baseline_${fileIndex} = 0;\n`,
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})),
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});
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for (const [fileIndex, filePath] of FILE_PATHS.entries()) {
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const generatedLines = Array.from(
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{ length: LINE_COUNT_PER_FILE },
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(_, lineIndex) =>
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`export const generated_${fileIndex}_${lineIndex} = "${lineIndex}-${"wide".repeat(16)}";`,
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).join("\n");
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await writeFile(
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path.join(repo.path, filePath),
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`export const baseline_${fileIndex} = 1;\n${generatedLines}\n`,
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);
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}
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return repo;
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}
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async function configureUnwrappedUnifiedDiff(page: Page): Promise<void> {
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await page.addInitScript(
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({ preferencesKey }) => {
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const scope = globalThis as typeof globalThis & {
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__PASEO_DIFF_REACT_STATS__?: { commits: number };
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};
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scope.__PASEO_DIFF_REACT_STATS__ = { commits: 0 };
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if (!localStorage.getItem(preferencesKey)) {
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localStorage.setItem(
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preferencesKey,
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JSON.stringify({
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layout: "unified",
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viewMode: "flat",
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wrapLines: false,
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hideWhitespace: false,
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}),
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);
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}
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},
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{ preferencesKey: CHANGES_PREFERENCES_KEY },
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);
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}
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async function expectSingleCanvasSurface(page: Page): Promise<void> {
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await expect(page.locator("canvas")).toHaveCount(1);
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await expect(page.locator('[data-testid^="diff-code-row-"]')).toHaveCount(0);
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const elementCount = await page
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.getByTestId("git-diff-canvas-root")
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.evaluate((root) => root.querySelectorAll("*").length);
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expect(elementCount).toBeLessThan(150);
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}
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async function continuouslyScrollCanvas(page: Page): Promise<{
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medianFrameMs: number;
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p95FrameMs: number;
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maximumFrameMs: number;
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slowFrames: number;
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endScrollTop: number;
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maximumScrollTop: number;
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frameSignatures: Array<{ scrollTop: number; signature: number }>;
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}> {
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return page.getByTestId("git-diff-scroll").evaluate(async (element) => {
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const scroll = element as HTMLElement;
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const maximumScrollTop = scroll.scrollHeight - scroll.clientHeight;
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scroll.scrollTop = 0;
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const frameDurations: number[] = [];
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const frameSignatures: Array<{ scrollTop: number; signature: number }> = [];
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let previousFrame = performance.now();
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for (let step = 1; step <= 90; step += 1) {
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await new Promise<void>((resolve) => requestAnimationFrame(() => resolve()));
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const now = performance.now();
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frameDurations.push(now - previousFrame);
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previousFrame = now;
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scroll.scrollTop = (maximumScrollTop * step) / 90;
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scroll.dispatchEvent(new Event("scroll", { bubbles: false }));
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if (step % 10 === 0) {
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await new Promise<void>((resolve) => requestAnimationFrame(() => resolve()));
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const canvas = document.querySelector<HTMLCanvasElement>(
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'[data-testid="git-diff-canvas"]',
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)!;
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frameSignatures.push({
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scrollTop: scroll.scrollTop,
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signature: canvasSignature(canvas, scroll),
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});
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previousFrame = performance.now();
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}
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}
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await new Promise<void>((resolve) => requestAnimationFrame(() => resolve()));
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const ordered = [...frameDurations].sort((left, right) => left - right);
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const percentile = (fraction: number) =>
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ordered[Math.min(ordered.length - 1, Math.floor(ordered.length * fraction))] ?? 0;
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return {
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medianFrameMs: percentile(0.5),
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p95FrameMs: percentile(0.95),
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maximumFrameMs: Math.max(...frameDurations),
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slowFrames: frameDurations.filter((duration) => duration > 50).length,
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endScrollTop: scroll.scrollTop,
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maximumScrollTop,
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frameSignatures,
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};
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function canvasSignature(canvasElement: HTMLCanvasElement, scrollElement: HTMLElement): number {
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const sample = document.createElement("canvas");
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sample.width = 64;
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sample.height = 36;
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const context = sample.getContext("2d")!;
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const canvasCssHeight = Number.parseFloat(canvasElement.style.height);
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const canvasTop = Number.parseFloat(canvasElement.style.top);
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const pixelRatio = canvasElement.height / canvasCssHeight;
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const sourceY = (scrollElement.scrollTop - canvasTop) * pixelRatio;
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context.drawImage(
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canvasElement,
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0,
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sourceY,
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canvasElement.width,
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scrollElement.clientHeight * pixelRatio,
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0,
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0,
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sample.width,
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sample.height,
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);
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const pixels = context.getImageData(0, 0, sample.width, sample.height).data;
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let hash = 2166136261;
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for (const value of pixels) hash = Math.imul(hash ^ value, 16777619);
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return hash >>> 0;
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}
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});
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}
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interface CapturedCanvasFrame {
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scrollTop: number;
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image: Buffer;
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}
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async function captureCanvasAtScrollIntervals(page: Page): Promise<CapturedCanvasFrame[]> {
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const scroll = page.getByTestId("git-diff-scroll");
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const frames: CapturedCanvasFrame[] = [];
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for (let step = 0; step <= 8; step += 1) {
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const scrollTop = await scroll.evaluate(async (element, progress) => {
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const scrollElement = element as HTMLElement;
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scrollElement.scrollTop =
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(scrollElement.scrollHeight - scrollElement.clientHeight) * Number(progress);
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scrollElement.dispatchEvent(new Event("scroll", { bubbles: false }));
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await new Promise<void>((resolve) => requestAnimationFrame(() => resolve()));
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return scrollElement.scrollTop;
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}, step / 8);
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frames.push({ scrollTop, image: await scroll.screenshot() });
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}
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return frames;
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}
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async function expectContinuousFramesMatchStableRender(
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page: Page,
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samples: Array<{ scrollTop: number; signature: number }>,
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): Promise<void> {
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const stable = await page.getByTestId("git-diff-scroll").evaluate(async (element, frames) => {
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const canvas = document.querySelector<HTMLCanvasElement>('[data-testid="git-diff-canvas"]')!;
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const signatures: number[] = [];
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for (const frame of frames) {
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element.scrollTop = frame.scrollTop;
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element.dispatchEvent(new Event("scroll", { bubbles: false }));
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await new Promise<void>((resolve) =>
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requestAnimationFrame(() => requestAnimationFrame(() => resolve())),
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);
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const sample = document.createElement("canvas");
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sample.width = 64;
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sample.height = 36;
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const context = sample.getContext("2d")!;
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drawVisibleCanvas(context, canvas, element as HTMLElement, sample.width, sample.height);
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const pixels = context.getImageData(0, 0, sample.width, sample.height).data;
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let hash = 2166136261;
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for (const value of pixels) hash = Math.imul(hash ^ value, 16777619);
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signatures.push(hash >>> 0);
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}
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return signatures;
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function drawVisibleCanvas(
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context: CanvasRenderingContext2D,
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canvasElement: HTMLCanvasElement,
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scroll: HTMLElement,
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width: number,
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height: number,
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): void {
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const canvasCssHeight = Number.parseFloat(canvasElement.style.height);
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const canvasTop = Number.parseFloat(canvasElement.style.top);
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const pixelRatio = canvasElement.height / canvasCssHeight;
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const sourceY = (scroll.scrollTop - canvasTop) * pixelRatio;
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context.drawImage(
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canvasElement,
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0,
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sourceY,
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canvasElement.width,
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scroll.clientHeight * pixelRatio,
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0,
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0,
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width,
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height,
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);
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}
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}, samples);
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expect(stable).toEqual(samples.map((sample) => sample.signature));
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}
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async function expectIndependentHorizontalOffsetsSurviveVerticalScrolling(
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page: Page,
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): Promise<void> {
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const first = page.getByTestId("diff-file-0-horizontal-scroll");
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const second = page.getByTestId("diff-file-1-horizontal-scroll");
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const firstOffset = await setHorizontalOffset(first, 240);
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const secondOffset = await setHorizontalOffset(second, 120);
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expect(firstOffset).not.toBe(secondOffset);
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await page.getByTestId("git-diff-scroll").evaluate(async (element) => {
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element.scrollTop = element.scrollHeight - element.clientHeight;
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element.dispatchEvent(new Event("scroll", { bubbles: false }));
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await new Promise<void>((resolve) => requestAnimationFrame(() => resolve()));
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element.scrollTop = 0;
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element.dispatchEvent(new Event("scroll", { bubbles: false }));
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await new Promise<void>((resolve) => requestAnimationFrame(() => resolve()));
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});
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await expect.poll(() => first.evaluate((element) => element.scrollLeft)).toBe(firstOffset);
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await expect.poll(() => second.evaluate((element) => element.scrollLeft)).toBe(secondOffset);
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}
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async function setHorizontalOffset(locator: Locator, offset: number) {
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return locator.evaluate(async (element, nextOffset) => {
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element.scrollLeft = nextOffset;
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element.dispatchEvent(new Event("scroll", { bubbles: false }));
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await new Promise<void>((resolve) => requestAnimationFrame(() => resolve()));
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return element.scrollLeft;
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}, offset);
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}
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async function startRendererInstrumentation(page: Page): Promise<void> {
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await page.getByTestId("git-diff-canvas-root").evaluate((root) => {
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const scope = globalThis as typeof globalThis & {
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__PASEO_DIFF_REACT_STATS__?: { commits: number };
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__PASEO_DIFF_RENDERER_STATS__?: {
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initialCommits: number;
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addedElements: number;
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removedElements: number;
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};
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};
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const reactStats = scope.__PASEO_DIFF_REACT_STATS__ ?? { commits: 0, unmounts: 0 };
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const stats = {
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initialCommits: reactStats.commits,
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addedElements: 0,
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removedElements: 0,
|
|
};
|
|
scope.__PASEO_DIFF_RENDERER_STATS__ = stats;
|
|
new MutationObserver((records) => {
|
|
for (const record of records) {
|
|
stats.addedElements += Array.from(record.addedNodes).filter(
|
|
(node) => node.nodeType === Node.ELEMENT_NODE,
|
|
).length;
|
|
stats.removedElements += Array.from(record.removedNodes).filter(
|
|
(node) => node.nodeType === Node.ELEMENT_NODE,
|
|
).length;
|
|
}
|
|
}).observe(root, { childList: true, subtree: true });
|
|
});
|
|
}
|
|
|
|
async function readRendererInstrumentation(page: Page): Promise<{
|
|
reactCommits: number;
|
|
addedElements: number;
|
|
removedElements: number;
|
|
}> {
|
|
return page.evaluate(() => {
|
|
const scope = globalThis as typeof globalThis & {
|
|
__PASEO_DIFF_REACT_STATS__?: { commits: number };
|
|
__PASEO_DIFF_RENDERER_STATS__?: {
|
|
initialCommits: number;
|
|
addedElements: number;
|
|
removedElements: number;
|
|
};
|
|
};
|
|
const react = scope.__PASEO_DIFF_REACT_STATS__!;
|
|
const renderer = scope.__PASEO_DIFF_RENDERER_STATS__!;
|
|
return {
|
|
reactCommits: react.commits - renderer.initialCommits,
|
|
addedElements: renderer.addedElements,
|
|
removedElements: renderer.removedElements,
|
|
};
|
|
});
|
|
}
|
|
|
|
async function collectHeapUsage(cdp: CDPSession): Promise<{ usedSize: number; totalSize: number }> {
|
|
await cdp.send("HeapProfiler.collectGarbage");
|
|
return cdp.send("Runtime.getHeapUsage");
|
|
}
|
|
|
|
async function startChromiumTrace(cdp: CDPSession): Promise<void> {
|
|
await cdp.send("Tracing.start", {
|
|
categories: [
|
|
"devtools.timeline",
|
|
"v8.execute",
|
|
"blink.user_timing",
|
|
"disabled-by-default-v8.cpu_profiler",
|
|
].join(","),
|
|
transferMode: "ReturnAsStream",
|
|
});
|
|
}
|
|
|
|
async function stopChromiumTrace(cdp: CDPSession, testInfo: TestInfo): Promise<void> {
|
|
const completed = new Promise<string>((resolve, reject) => {
|
|
cdp.once("Tracing.tracingComplete", ({ stream }) => {
|
|
if (stream) resolve(stream);
|
|
else reject(new Error("Chromium trace completed without a stream"));
|
|
});
|
|
});
|
|
await cdp.send("Tracing.end");
|
|
const stream = await completed;
|
|
const chunks: string[] = [];
|
|
let eof = false;
|
|
while (!eof) {
|
|
const chunk = await cdp.send("IO.read", { handle: stream });
|
|
chunks.push(chunk.data);
|
|
eof = chunk.eof;
|
|
}
|
|
await cdp.send("IO.close", { handle: stream });
|
|
const trace = chunks.join("");
|
|
await writeFile(testInfo.outputPath("diff-canvas-chromium-trace.json"), trace);
|
|
await testInfo.attach("diff-canvas-chromium-trace", {
|
|
body: trace,
|
|
contentType: "application/json",
|
|
});
|
|
}
|
|
|
|
async function attachPerformanceReport(
|
|
testInfo: TestInfo,
|
|
report: Record<string, unknown>,
|
|
): Promise<void> {
|
|
await testInfo.attach("diff-canvas-performance", {
|
|
body: JSON.stringify(report, null, 2),
|
|
contentType: "application/json",
|
|
});
|
|
}
|