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devtools.ts
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devtools.ts
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import type {Protocol} from "devtools-protocol"
import CDP = require("chrome-remote-interface")
import fs from "fs"
import path from "path"
import readline from "readline"
import chalk from "chalk"
import yargs from "yargs"
import {Bar, Presets} from "cli-progress"
import type {Box, State} from "./baselines"
import {create_baseline, diff_baseline, load_baselines} from "./baselines"
import {diff_image} from "./image"
import {platform} from "./sys"
const MAX_INT32 = 2147483647
export class Random {
private seed: number
constructor(seed: number) {
this.seed = seed % MAX_INT32
if (this.seed <= 0) {
this.seed += MAX_INT32 - 1
}
}
integer(): number {
this.seed = (48271*this.seed) % MAX_INT32
return this.seed
}
float(): number {
return (this.integer() - 1) / (MAX_INT32 - 1)
}
}
function shuffle<T>(array: T[], random: Random): void {
for (let i = array.length - 1; i > 0; i--) {
const j = Math.floor(random.float()*(i + 1))
const temp = array[i]
array[i] = array[j]
array[j] = temp
}
}
let rl: readline.Interface | undefined
if (process.platform == "win32") {
rl = readline.createInterface({
input: process.stdin,
output: process.stdout,
})
rl.on("SIGINT", () => {
process.emit("SIGINT", "SIGINT")
})
}
process.on("SIGINT", () => {
console.log()
process.exit(130)
})
process.on("exit", () => {
rl?.close()
})
const argv = yargs(process.argv.slice(2)).options({
host: {type: "string", default: "127.0.0.1"},
port: {type: "number", default: 9222},
ref: {type: "string", default: "HEAD"},
randomize: {type: "boolean", default: false},
seed: {type: "number", default: Date.now()},
pedantic: {type: "boolean", default: false},
keyword: {type: "string", array: true, demandOption: false, alias: "k"},
grep: {type: "string", array: true, demandOption: false},
"baselines-root": {type: "string", demandOption: false},
screenshot: {type: "string", choices: ["test", "save", "skip"] as const, default: "test"},
retry: {type: "boolean", default: false},
info: {type: "boolean", default: false},
}).parseSync()
const {host, port, ref, randomize, seed, pedantic, keyword, grep, screenshot, retry, info} = argv
const url = argv._[0] as string | undefined ?? "about:blank"
interface CallFrame {
name: string
url: string
line: number
col: number
}
interface Err {
text: string
url: string
line: number
col: number
trace: CallFrame[]
}
class Exit extends Error {
constructor(public code: number) {
super(`exit: ${code}`)
}
}
class TimeoutError extends Error {
constructor() {
super("timeout")
}
}
function timeout(ms: number): Promise<void> {
return new Promise((_resolve, reject) => {
const timer = setTimeout(() => reject(new TimeoutError()), ms)
timer.unref()
})
}
function encode(s: string): string {
return s.replace(/[ \/\[\]:]/g, "_")
}
type Suite = {description: string, suites: Suite[], tests: Test[]}
type Test = {description: string, skip: boolean, threshold?: number, retries?: number, dpr?: number, no_image?: boolean}
type Result = {error: {str: string, stack?: string} | null, time: number, state?: State, bbox?: Box}
type TestRunContext = {
chromium_version: number
}
async function run_tests(ctx: TestRunContext): Promise<boolean> {
let client
let failure = false
try {
client = await CDP({port, host})
const {Emulation, Network, Browser, Page, Runtime, Log, Performance} = client
try {
function collect_trace(stackTrace: Protocol.Runtime.StackTrace): CallFrame[] {
return stackTrace.callFrames.map(({functionName, url, lineNumber, columnNumber}) => {
return {name: functionName != "" ? functionName : "(anonymous)", url, line: lineNumber+1, col: columnNumber+1}
})
}
function handle_exception(exceptionDetails: Protocol.Runtime.ExceptionDetails): Err {
const {text, exception, url, lineNumber, columnNumber, stackTrace} = exceptionDetails
return {
text: exception != null && exception.description != null ? exception.description : text,
url: url ?? "(inline)",
line: lineNumber+1,
col: columnNumber+1,
trace: stackTrace != null ? collect_trace(stackTrace) : [],
}
}
type LogEntry = {level: "warning" | "error", text: string}
let entries: LogEntry[] = []
let exceptions: Err[] = []
Runtime.consoleAPICalled(({type, args}) => {
if (type == "warning" || type == "error") {
const text = args.map(({value}) => value ? value.toString() : "").join(" ")
entries.push({level: type, text})
}
})
Log.entryAdded(({entry}) => {
const {level, text} = entry
if (level == "warning" || level == "error") {
entries.push({level, text})
}
})
Runtime.exceptionThrown(({exceptionDetails}) => {
exceptions.push(handle_exception(exceptionDetails))
})
function fail(msg: string, code: number = 1): never {
console.log(msg)
throw new Exit(code)
}
// type Nominal<T, Name> = T & {[Symbol.species]: Name}
class Value<T> {
constructor(public value: T) {}
}
class Failure {
constructor(public text: string) {}
}
class Timeout {}
async function with_timeout<T>(promise: Promise<T>, wait: number): Promise<T | Timeout> {
try {
return await Promise.race([promise, timeout(wait)]) as T
} catch (err) {
if (err instanceof TimeoutError) {
return new Timeout()
} else {
throw err
}
}
}
async function evaluate<T>(expression: string, timeout: number = 10000): Promise<Value<T> | Failure | Timeout> {
const output = await with_timeout(Runtime.evaluate({expression, returnByValue: true, awaitPromise: true}), timeout)
if (output instanceof Timeout) {
return output
} else {
const {result, exceptionDetails} = output
if (exceptionDetails == null) {
return new Value(result.value)
} else {
const {text} = handle_exception(exceptionDetails)
return new Failure(text)
}
}
}
async function is_ready(): Promise<boolean> {
const expr = "typeof Bokeh !== 'undefined'"
const result = await evaluate<boolean>(expr)
return result instanceof Value && result.value
}
await Network.enable()
await Network.setCacheDisabled({cacheDisabled: true})
await Page.enable()
await Page.navigate({url: "about:blank"})
await Runtime.enable()
await Log.enable()
await Performance.enable({timeDomain: "timeTicks"})
async function override_metrics(dpr: number = 1): Promise<void> {
await Emulation.setDeviceMetricsOverride({
width: 2000,
height: 4000,
deviceScaleFactor: dpr,
mobile: false,
})
}
await override_metrics()
await Browser.grantPermissions({
permissions: ["clipboardReadWrite"],
})
const {errorText} = await Page.navigate({url})
if (errorText != null) {
fail(errorText)
}
if (exceptions.length != 0) {
for (const exc of exceptions) {
console.log(exc.text)
}
fail(`failed to load ${url}`)
}
await Page.loadEventFired()
await evaluate("preload_fonts()")
const ready = await is_ready()
if (!ready) {
fail(`failed to render ${url}`)
}
const result = await evaluate<Suite>("Tests.top_level")
if (!(result instanceof Value)) {
// TODO: Failure.text
const reason = result instanceof Failure ? result.text : "timeout"
fail(`internal error: failed to collect tests: ${reason}`)
}
const top_level = result.value
type Status = {
success?: boolean
failure?: boolean
timeout?: boolean
skipped?: boolean
errors: string[]
baseline_name?: string
baseline?: string
baseline_diff?: string
reference?: Buffer
image?: Buffer
image_diff?: Buffer
existing_blf?: string
existing_png?: Buffer
}
type TestItem = [Suite[], Test, Status]
function* iter({suites, tests}: Suite, parents: Suite[] = []): Iterable<TestItem> {
for (const suite of suites) {
yield* iter(suite, parents.concat(suite))
}
for (const test of tests) {
yield [parents, test, {errors: []}]
}
}
function descriptions(suites: Suite[], test: Test): string[] {
return [...suites, test].map((obj) => obj.description)
}
function description(suites: Suite[], test: Test, sep: string = " "): string {
return descriptions(suites, test).join(sep)
}
const all_tests = [...iter(top_level)]
const test_suite = all_tests
if (randomize) {
const random = new Random(seed)
console.log(`randomizing with seed ${seed}`)
shuffle(test_suite, random)
}
if (keyword != null || grep != null) {
if (keyword != null) {
const keywords = keyword
for (const [suites, test] of test_suite) {
if (!keywords.some((keyword) => description(suites, test).includes(keyword))) {
test.skip = true
}
}
}
if (grep != null) {
const regexes = grep.map((re) => new RegExp(re))
for (const [suites, test] of test_suite) {
if (!regexes.some((regex) => description(suites, test).match(regex) != null)) {
test.skip = true
}
}
}
}
if (test_suite.length == 0) {
fail("nothing to test")
}
if (!test_suite.some(([, test]) => !test.skip)) {
fail("nothing to test because all tests were skipped")
}
const baselines_root = argv["baselines-root"]
const baseline_names = new Set<string>()
if (baselines_root != null) {
const baseline_paths = []
for (const test_case of test_suite) {
const [suites, test, _status] = test_case
const baseline_name = encode(description(suites, test, "__"))
const baseline_path = path.join(baselines_root, platform, baseline_name)
baseline_paths.push(baseline_path)
}
const baselines = await load_baselines(baseline_paths, ref)
for (let i = 0; i < baselines.length; i++) {
const [,, status] = test_suite[i]
const baseline = baselines[i]
if (baseline.blf != null) {
status.existing_blf = baseline.blf
}
if (baseline.png != null) {
status.existing_png = baseline.png
}
}
}
const progress = new Bar({
format: "{bar} {percentage}% | {value} of {total}{failures}{skipped} | {duration}s",
stream: process.stdout,
noTTYOutput: true,
notTTYSchedule: 1000,
}, Presets.shades_classic)
let skipped = 0
let failures = 0
function to_seq(suites: Suite[], test: Test): [number[], number] {
let current = top_level
const si = []
for (const suite of suites) {
si.push(current.suites.indexOf(suite))
current = suite
}
const ti = current.tests.indexOf(test)
return [si, ti]
}
function state(): object {
function format(value: number, single: string, plural?: string): string {
if (value == 0) {
return ""
} else if (value == 1) {
return ` | 1 ${single}`
} else {
return ` | ${value} ${plural ?? single}`
}
}
return {
failures: format(failures, "failure", "failures"),
skipped: format(skipped, "skipped"),
}
}
progress.start(test_suite.length, 0, state())
type MetricKeys = "JSEventListeners" | "Nodes" | "Resources" | "LayoutCount" | "RecalcStyleCount" | "JSHeapUsedSize" | "JSHeapTotalSize"
const metrics: {[key in MetricKeys]: number[]} = {
JSEventListeners: [],
Nodes: [],
Resources: [],
LayoutCount: [],
RecalcStyleCount: [],
JSHeapUsedSize: [],
JSHeapTotalSize: [],
}
async function add_datapoint(): Promise<void> {
if (baselines_root == null) {
return
}
const data = await Performance.getMetrics()
for (const {name, value} of data.metrics) {
switch (name) {
case "JSEventListeners":
case "Nodes":
case "Resources":
case "LayoutCount":
case "RecalcStyleCount":
case "JSHeapUsedSize":
case "JSHeapTotalSize":
metrics[name].push(value)
}
}
}
await add_datapoint()
const out_stream = await (async () => {
if (baselines_root != null) {
const report_out = path.join(baselines_root, platform, "report.out")
await fs.promises.writeFile(report_out, "")
const stream = fs.createWriteStream(report_out, {flags: "a"})
stream.write(`Tests report output generated on ${new Date().toISOString()}:\n`)
return stream
} else {
return null
}
})()
function format_output(test_case: TestItem): string | null {
const [suites, test, status] = test_case
if ((status.failure ?? false) || (status.timeout ?? false)) {
const output = []
let depth = 0
for (const suite of [...suites, test]) {
const is_last = depth == suites.length
const prefix = depth == 0 ? chalk.red("\u2717") : `${" ".repeat(depth)}\u2514${is_last ? "\u2500" : "\u252c"}\u2500`
output.push(`${prefix} ${suite.description}`)
depth++
}
for (const error of status.errors) {
output.push(error)
}
return output.join("\n")
} else {
return null
}
}
function append_report_out(test_case: TestItem): void {
if (out_stream != null) {
const output = format_output(test_case)
if (output != null) {
out_stream.write("\n")
out_stream.write(output)
out_stream.write("\n")
}
}
}
try {
for (const test_case of test_suite) {
const [suites, test, status] = test_case
entries = []
exceptions = []
const baseline_name = encode(description(suites, test, "__"))
status.baseline_name = baseline_name
if (baseline_names.has(baseline_name)) {
status.errors.push("duplicated description")
status.failure = true
} else {
baseline_names.add(baseline_name)
}
if (test.skip) {
status.skipped = true
} else {
async function run_test(attempt: number | null, status: Status): Promise<boolean> {
let may_retry = false
const seq = JSON.stringify(to_seq(suites, test))
const ctx_ = JSON.stringify(ctx)
const output = await (async () => {
if (test.dpr != null) {
await override_metrics(test.dpr)
}
try {
return await evaluate<Result>(`Tests.run(${seq}, ${ctx_})`)
} finally {
if (test.dpr != null) {
await override_metrics()
}
}
})()
await add_datapoint()
try {
const errors = entries.filter((entry) => entry.level == "error")
if (errors.length != 0) {
status.errors.push(...errors.map((entry) => entry.text))
// status.failure = true // XXX: too chatty right now
}
if (exceptions.length != 0) {
status.errors.push(...exceptions.map((exc) => exc.text))
status.failure = true // XXX: too chatty right now
}
if (output instanceof Failure) {
status.errors.push(output.text)
status.failure = true
} else if (output instanceof Timeout) {
status.errors.push("timeout")
status.timeout = true
} else {
const result = output.value
if (result.error != null) {
const {str, stack} = result.error
status.errors.push(stack ?? str)
status.failure = true
}
if (baselines_root != null) {
const baseline_path = path.join(baselines_root, platform, baseline_name)
const {state: state_early} = result
if (state_early == null) {
status.errors.push("state not present in output")
status.failure = true
} else {
const output = await evaluate<State | null>(`Tests.get_state(${seq})`)
if (!(output instanceof Value) || output.value == null) {
status.errors.push("state not present in output")
status.failure = true
} else {
const state = output.value
await (async () => {
const baseline_early = create_baseline([state_early])
const baseline = create_baseline([state])
if (pedantic) {
// This shouldn't happen, but sometimes does, especially in
// interactive tests. This needs to be resolved earlier, but
// at least the state will be consistent with images.
if (baseline_early != baseline) {
status.errors.push("inconsistent state")
status.errors.push("early:", baseline_early)
status.errors.push("later:", baseline)
status.failure = true
return
}
}
const baseline_file = `${baseline_path}.blf`
await fs.promises.writeFile(baseline_file, baseline)
status.baseline = baseline
const {existing_blf} = status
if (existing_blf != baseline) {
if (existing_blf == null) {
status.errors.push("missing baseline")
} else {
if (test.retries != null) {
may_retry = true
}
}
const diff = diff_baseline(baseline_file, ref)
status.failure = true
status.baseline_diff = diff
status.errors.push(diff)
}
})()
}
}
if (!(test.no_image ?? false)) {
await (async () => {
const {bbox} = result
if (bbox != null) {
const image = await Page.captureScreenshot({format: "png", clip: {...bbox, scale: 1}})
const current = Buffer.from(image.data, "base64")
status.image = current
const image_file = `${baseline_path}.png`
const write_image = async () => fs.promises.writeFile(image_file, current)
const {existing_png} = status
switch (screenshot) {
case "test": {
if (existing_png == null) {
status.failure = true
status.errors.push("missing baseline image")
await write_image()
} else {
status.reference = existing_png
if (!existing_png.equals(current)) {
const diff_result = diff_image(existing_png, current)
if (diff_result != null) {
may_retry = true
const {diff, pixels, percent} = diff_result
const threshold = test.threshold ?? 0
if (pixels > threshold) {
await write_image()
status.failure = true
status.image_diff = diff
status.errors.push(`images differ by ${pixels}px (${percent.toFixed(2)}%)${attempt != null ? ` (attempt=${attempt})` : ""}`)
}
}
}
}
break
}
case "save": {
await write_image()
break
}
case "skip": {
break
}
default: {
throw new Error(`invalid argument --screenshot=${screenshot}`)
}
}
}
})()
}
}
}
} finally {
const output = await evaluate(`Tests.clear(${seq})`)
if (output instanceof Failure) {
status.errors.push(output.text)
status.failure = true
}
}
return may_retry
}
const do_retry = await run_test(null, status)
if ((retry || test.retries != null) && do_retry) {
const retries = test.retries ?? 10
for (let i = 0; i < retries; i++) {
const do_retry = await run_test(i, status)
if (!do_retry) {
break
}
}
}
}
if (status.skipped ?? false) {
skipped++
}
if ((status.failure ?? false) || (status.timeout ?? false)) {
failures++
}
append_report_out(test_case)
progress.increment(1, state())
}
} finally {
progress.stop()
}
if (out_stream != null) {
out_stream.write("\n")
out_stream.write(`Tests finished on ${new Date().toISOString()} with ${failures} failures.\n`)
out_stream.end()
}
for (const test_case of test_suite) {
const output = format_output(test_case)
if (output != null) {
console.log("")
console.log(output)
}
}
if (baselines_root != null) {
const results = test_suite.map(([suites, test, status]) => {
const {failure, image, image_diff, reference} = status
return [descriptions(suites, test), {failure, image, image_diff, reference}]
})
const json = JSON.stringify({results, metrics}, (_key, value) => {
if (value?.type == "Buffer") {
return Buffer.from(value.data).toString("base64")
} else {
return value
}
})
await fs.promises.writeFile(path.join(baselines_root, platform, "report.json"), json)
const files = new Set(await fs.promises.readdir(path.join(baselines_root, platform)))
files.delete("report.json")
files.delete("report.out")
for (const name of baseline_names) {
files.delete(`${name}.blf`)
files.delete(`${name}.png`)
}
if (files.size != 0) {
fail(`there are outdated baselines:\n${[...files].join("\n")}`)
}
}
if (failures != 0) {
throw new Exit(1)
}
} finally {
await Runtime.discardConsoleEntries()
}
} catch (error) {
failure = true
if (!(error instanceof Exit)) {
const msg = error instanceof Error && error.stack != null ? error.stack : error
console.error(`INTERNAL ERROR: ${msg}`)
}
} finally {
if (client != null) {
await client.close()
}
}
return !failure
}
async function get_version(): Promise<{browser: string, protocol: string}> {
const version = await CDP.Version({port})
return {
browser: version.Browser,
protocol: version["Protocol-Version"],
}
}
type Version = [number, number, number, number]
const supported_chromium_version: Version = [118, 0, 5993, 88]
function get_version_tuple(version: string): Version | null {
const match = version.match(/(\d+)\.(\d+)\.(\d+)\.(\d+)/)
if (match != null) {
const [, a, b, c, d] = match.values()
return [
Number(a),
Number(b),
Number(c),
Number(d),
]
}
return null
}
function check_version(current_chromium_version: Version | null): void {
if (current_chromium_version == null) {
const supported_str = supported_chromium_version.join(".")
console.error(`${chalk.yellow("warning:")} unable to determine chromium version; officially supported version is ${supported_str}`)
return
}
const [a, b, c, _d] = supported_chromium_version
const [A, B, C, _D] = current_chromium_version
if (a != A || b != B || c != C) {
const supported_str = chalk.magenta(supported_chromium_version.join("."))
const current_str = chalk.magenta(current_chromium_version.join("."))
console.error(`${chalk.yellow("warning:")} ${current_str} is not supported; officially supported version is ${supported_str}`)
}
}
async function run(): Promise<void> {
const {browser, protocol} = await get_version()
console.log(`Running in ${chalk.cyan(browser)} using devtools protocol ${chalk.cyan(protocol)}`)
const version = get_version_tuple(browser)
check_version(version)
const major = version != null ? version[0] : 0
const ok = !info ? await run_tests({chromium_version: major}) : true
process.exit(ok ? 0 : 1)
}
async function main(): Promise<void> {
try {
await run()
} catch (e) {
console.log(`CRITICAL ERROR: ${e}`)
process.exit(1)
}
}
void main()