62 lines
1.8 KiB
JavaScript
62 lines
1.8 KiB
JavaScript
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/**
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* 通过 CDP 读取运行中的 Electron 页面：文本、节点数量与控制台错误。
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* 用法：node scripts/cdp-probe.mjs [expression]
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*/
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const endpoint = process.env.CDP_ENDPOINT || "http://127.0.0.1:9223";
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const targets = await (await fetch(`${endpoint}/json/list`)).json();
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const page = targets.find((item) => item.type === "page");
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if (!page) throw new Error("no page target");
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const ws = new WebSocket(page.webSocketDebuggerUrl);
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const pending = new Map();
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const events = [];
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let seq = 0;
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function send(method, params = {}) {
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return new Promise((resolve, reject) => {
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const id = ++seq;
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pending.set(id, { resolve, reject });
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ws.send(JSON.stringify({ id, method, params }));
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});
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}
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await new Promise((resolve, reject) => {
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ws.onopen = resolve;
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ws.onerror = reject;
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});
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ws.onmessage = (event) => {
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const message = JSON.parse(event.data);
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if (message.id && pending.has(message.id)) {
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const { resolve, reject } = pending.get(message.id);
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pending.delete(message.id);
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if (message.error) reject(new Error(JSON.stringify(message.error)));
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else resolve(message.result);
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} else {
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events.push(message);
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}
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};
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await send("Runtime.enable");
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await send("Log.enable");
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const expression = process.argv[2] || "document.body.innerText.slice(0, 6000)";
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const result = await send("Runtime.evaluate", {
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expression,
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returnByValue: true,
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awaitPromise: true
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});
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console.log("=== result ===");
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console.log(JSON.stringify(result.result?.value ?? result, null, 2));
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const errors = events.filter(
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(item) =>
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item.method === "Runtime.exceptionThrown" ||
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(item.method === "Log.entryAdded" && ["error", "warning"].includes(item.params?.entry?.level))
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);
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console.log("\n=== errors/warnings ===");
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console.log(JSON.stringify(errors.map((item) => item.params), null, 2).slice(0, 6000));
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ws.close();
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