90 lines
3.6 KiB
JavaScript
90 lines
3.6 KiB
JavaScript
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import {spawn} from "node:child_process";
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import {mkdtempSync, readFileSync, rmSync, writeFileSync} from "node:fs";
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import {tmpdir} from "node:os";
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import {join} from "node:path";
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// Args: <chromium binary> <plan.json>; the plan lists steps {width, height, url, wait, probe, shot}.
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// Prints {results, errors}: one probe value per step and every uncaught page exception.
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const [binary, planFile] = process.argv.slice(2);
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const plan = JSON.parse(readFileSync(planFile, "utf8"));
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const profile = mkdtempSync(join(tmpdir(), "cdp-"));
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// --no-sandbox: the agent sandbox already forbids the user namespaces Chromium's own sandbox needs.
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const flags = ["--headless", "--no-sandbox", "--disable-gpu", "--no-first-run", "--no-default-browser-check", "--hide-scrollbars", `--user-data-dir=${profile}`, "--remote-debugging-port=0", "about:blank"];
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const browser = spawn(binary, flags, {stdio: ["ignore", "ignore", "pipe"]});
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const sleep = (ms) => new Promise((resolve) => setTimeout(resolve, ms));
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const address = await new Promise((resolve, reject) => {
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let text = "";
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const timer = setTimeout(() => reject(new Error(`no DevTools address: ${text.slice(-500)}`)), 30000);
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browser.stderr.on("data", (chunk) => {
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text += chunk;
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const found = /DevTools listening on (ws:\/\/\S+)/.exec(text);
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if (found) {
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clearTimeout(timer);
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resolve(found[1]);
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}
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});
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browser.on("exit", (code) => reject(new Error(`browser exited with ${code}: ${text.slice(-500)}`)));
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});
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const socket = new WebSocket(address);
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await new Promise((resolve, reject) => {
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socket.onopen = resolve;
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socket.onerror = reject;
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});
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const waiting = new Map();
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const errors = [];
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let next = 0;
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socket.onmessage = (event) => {
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const data = JSON.parse(event.data);
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if (data.method === "Runtime.exceptionThrown") {
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const details = data.params.exceptionDetails;
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errors.push(details.exception ? details.exception.description : details.text);
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}
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if (data.id && waiting.has(data.id)) {
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const {resolve, reject} = waiting.get(data.id);
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waiting.delete(data.id);
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if (data.error) {
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reject(new Error(JSON.stringify(data.error)));
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} else {
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resolve(data.result);
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}
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}
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};
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function send(method, params, sessionId) {
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next += 1;
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const id = next;
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socket.send(JSON.stringify({id, method, params, ...(sessionId ? {sessionId} : {})}));
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return new Promise((resolve, reject) => waiting.set(id, {resolve, reject}));
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}
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const results = [];
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try {
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const {targetId} = await send("Target.createTarget", {url: "about:blank"});
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const {sessionId} = await send("Target.attachToTarget", {targetId, flatten: true});
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const page = (method, params) => send(method, params, sessionId);
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await page("Runtime.enable", {});
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for (const step of plan.steps) {
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await page("Emulation.setDeviceMetricsOverride", {width: step.width, height: step.height, deviceScaleFactor: 1, mobile: false});
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if (step.url) {
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await page("Page.navigate", {url: step.url});
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}
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await sleep(step.wait);
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let value = null;
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if (step.probe) {
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const {result, exceptionDetails} = await page("Runtime.evaluate", {expression: step.probe, awaitPromise: true, returnByValue: true});
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value = exceptionDetails ? {error: exceptionDetails.exception ? exceptionDetails.exception.description : exceptionDetails.text} : result.value;
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}
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if (step.shot) {
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const {data} = await page("Page.captureScreenshot", {format: "png"});
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writeFileSync(step.shot, Buffer.from(data, "base64"));
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}
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results.push(value);
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}
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} finally {
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socket.close();
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browser.kill();
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rmSync(profile, {recursive: true, force: true});
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}
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console.log(JSON.stringify({results, errors}));
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