37a1b404e9
- 首次请求走 HTTP/1.1，如果 socket hang up < 2s 自动切 HTTP/2 - H2 主机缓存在内存中，后续请求直接走 H2（如 googleapis.com） - H2 session 池复用 + 空闲超时自动清理 - 详细日志：proxy_request → proxy_response/error，含协议标识 - 解决 googleapis.com 强制 H2 导致请求失败的问题
307 lines
11 KiB
JavaScript
307 lines
11 KiB
JavaScript
'use strict';
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const http = require('http');
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const https = require('https');
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const http2 = require('http2');
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const net = require('net');
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// ─── 配置 ───────────────────────────────────────────────
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const UPSTREAM_HOST = process.env.UPSTREAM_HOST || 'api.anthropic.com';
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const LISTEN_PORT = parseInt(process.env.PROXY_PORT || '3456', 10);
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const LISTEN_HOST = process.env.PROXY_HOST || '127.0.0.1';
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const UPSTREAM_PROXY = process.env.UPSTREAM_PROXY || '';
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const CONNECT_TIMEOUT = parseInt(process.env.CONNECT_TIMEOUT || '30000', 10);
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const IDLE_TIMEOUT = parseInt(process.env.IDLE_TIMEOUT || '600000', 10);
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const log = (level, msg, extra = {}) => {
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const entry = { time: new Date().toISOString(), level, msg, ...extra };
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process.stderr.write(JSON.stringify(entry) + '\n');
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};
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const HEALTH_PATH = '/__health';
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// ─── 协议缓存：记录哪些主机需要 H2 ──────────────────────
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// 首次请求用 H1，如果秒挂（socket hang up < 2s）自动切 H2 并缓存
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const h2Hosts = new Set();
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// ─── H2 会话池 ──────────────────────────────────────────
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const h2Sessions = new Map();
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function getH2Session(host) {
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const existing = h2Sessions.get(host);
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if (existing && !existing.closed && !existing.destroyed) return existing;
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const session = http2.connect(`https://${host}`);
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session.on('error', (err) => {
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log('warn', 'h2_session_error', { host, error: err.message });
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h2Sessions.delete(host);
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});
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session.on('close', () => h2Sessions.delete(host));
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session.setTimeout(IDLE_TIMEOUT, () => {
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session.close();
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h2Sessions.delete(host);
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});
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h2Sessions.set(host, session);
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return session;
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}
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// ─── CONNECT 隧道 ────────────────────────────────────────
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function connectViaProxy(proxyUrl, targetHost, targetPort) {
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return new Promise((resolve, reject) => {
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const proxy = new URL(proxyUrl);
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const conn = net.connect(parseInt(proxy.port || '80', 10), proxy.hostname, () => {
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const auth = proxy.username
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? `Proxy-Authorization: Basic ${Buffer.from(
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`${decodeURIComponent(proxy.username)}:${decodeURIComponent(proxy.password || '')}`
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).toString('base64')}\r\n`
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: '';
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conn.write(
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`CONNECT ${targetHost}:${targetPort} HTTP/1.1\r\n` +
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`Host: ${targetHost}:${targetPort}\r\n` + auth + '\r\n'
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);
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});
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conn.once('error', reject);
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conn.setTimeout(CONNECT_TIMEOUT, () => conn.destroy(new Error('proxy CONNECT timeout')));
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let buf = '';
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const onData = (chunk) => {
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buf += chunk.toString();
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const idx = buf.indexOf('\r\n\r\n');
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if (idx === -1) return;
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conn.removeListener('data', onData);
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const code = parseInt(buf.split(' ')[1], 10);
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if (code === 200) {
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conn.setTimeout(0);
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const rest = buf.slice(idx + 4);
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if (rest.length > 0) conn.unshift(Buffer.from(rest));
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resolve(conn);
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} else {
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conn.destroy();
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reject(new Error(`CONNECT failed: ${code}`));
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}
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};
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conn.on('data', onData);
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});
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}
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// ─── H1 代理 ─────────────────────────────────────────────
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function proxyViaH1(targetHost, req, res) {
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return new Promise((resolve) => {
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const headers = { ...req.headers };
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headers.host = targetHost;
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delete headers['x-forwarded-host'];
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delete headers['connection'];
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delete headers['keep-alive'];
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delete headers['proxy-connection'];
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delete headers['transfer-encoding'];
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const opts = {
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hostname: targetHost, port: 443, path: req.url,
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method: req.method, headers, servername: targetHost,
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timeout: CONNECT_TIMEOUT,
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};
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const startTime = Date.now();
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let proxyReq;
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const doRequest = (requestOpts) => {
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proxyReq = https.request(requestOpts);
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proxyReq.on('response', (proxyRes) => {
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log('info', 'proxy_response', { host: targetHost, status: proxyRes.statusCode, path: req.url, proto: 'h1' });
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const rh = { ...proxyRes.headers };
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delete rh['connection'];
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delete rh['keep-alive'];
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res.writeHead(proxyRes.statusCode, rh);
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proxyRes.pipe(res, { end: true });
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proxyRes.on('error', (e) => { log('error', 'h1_response_error', { error: e.message }); res.end(); });
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resolve('ok');
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});
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proxyReq.on('error', (err) => {
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const elapsed = Date.now() - startTime;
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// socket hang up < 2 秒 = 服务器拒绝 H1，切换到 H2
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if (err.message === 'socket hang up' && elapsed < 2000) {
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log('info', 'h1_rejected_switching_to_h2', { host: targetHost, elapsed });
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h2Hosts.add(targetHost);
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proxyViaH2(targetHost, req, res);
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resolve('h2_fallback');
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return;
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}
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log('error', 'h1_upstream_error', { error: err.message, host: targetHost, path: req.url });
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if (!res.headersSent) {
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res.writeHead(502, { 'content-type': 'application/json' });
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res.end(JSON.stringify({ error: 'upstream_error', message: err.message }));
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}
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resolve('error');
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});
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proxyReq.on('timeout', () => proxyReq.destroy(new Error('upstream timeout')));
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req.on('close', () => { if (!proxyReq.destroyed) proxyReq.destroy(); });
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req.pipe(proxyReq, { end: true });
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};
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if (UPSTREAM_PROXY) {
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connectViaProxy(UPSTREAM_PROXY, targetHost, 443)
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.then((socket) => { opts.socket = socket; opts.agent = false; doRequest(opts); })
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.catch((err) => {
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log('error', 'proxy_tunnel_failed', { error: err.message, host: targetHost });
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if (!res.headersSent) {
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res.writeHead(502, { 'content-type': 'application/json' });
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res.end(JSON.stringify({ error: 'proxy_tunnel_error' }));
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}
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resolve('error');
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});
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} else {
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doRequest(opts);
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}
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});
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}
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// ─── H2 代理 ─────────────────────────────────────────────
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function proxyViaH2(targetHost, req, res) {
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try {
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const session = getH2Session(targetHost);
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const headers = {};
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// 只拷贝合法的 H2 头（跳过 H1 专用头和连接头）
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const skipHeaders = new Set([
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'host', 'connection', 'keep-alive', 'proxy-connection',
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'transfer-encoding', 'upgrade', 'x-forwarded-host',
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'http2-settings',
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]);
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for (const [k, v] of Object.entries(req.headers)) {
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if (!skipHeaders.has(k.toLowerCase())) {
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headers[k] = v;
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}
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}
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// H2 伪头
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headers[':method'] = req.method;
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headers[':path'] = req.url;
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headers[':authority'] = targetHost;
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headers[':scheme'] = 'https';
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const h2Stream = session.request(headers);
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let responded = false;
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h2Stream.on('response', (h2Headers) => {
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responded = true;
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const status = h2Headers[':status'] || 502;
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const respHeaders = {};
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for (const [k, v] of Object.entries(h2Headers)) {
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if (!k.startsWith(':')) respHeaders[k] = v;
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}
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log('info', 'proxy_response', { host: targetHost, status, path: req.url, proto: 'h2' });
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res.writeHead(status, respHeaders);
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h2Stream.pipe(res, { end: true });
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});
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h2Stream.on('error', (err) => {
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log('error', 'h2_stream_error', { error: err.message, host: targetHost, path: req.url });
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h2Sessions.delete(targetHost); // 清理坏 session
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if (!responded && !res.headersSent) {
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res.writeHead(502, { 'content-type': 'application/json' });
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res.end(JSON.stringify({ error: 'h2_error', message: err.message }));
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}
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});
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h2Stream.on('close', () => {
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if (!responded && !res.headersSent) {
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log('warn', 'h2_stream_closed_no_response', { host: targetHost, path: req.url });
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res.writeHead(502, { 'content-type': 'application/json' });
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res.end(JSON.stringify({ error: 'h2_no_response' }));
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}
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});
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// 超时
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h2Stream.setTimeout(CONNECT_TIMEOUT, () => {
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log('warn', 'h2_timeout', { host: targetHost, path: req.url });
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h2Stream.close();
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});
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req.on('close', () => {
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if (!h2Stream.destroyed) h2Stream.close();
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});
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// pipe 请求体
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req.pipe(h2Stream, { end: true });
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} catch (err) {
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log('error', 'h2_proxy_exception', { error: err.message, host: targetHost });
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h2Sessions.delete(targetHost);
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if (!res.headersSent) {
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res.writeHead(502, { 'content-type': 'application/json' });
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res.end(JSON.stringify({ error: 'h2_exception', message: err.message }));
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}
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}
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}
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// ─── 请求入口 ─────────────────────────────────────────────
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async function proxyRequest(req, res) {
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const targetHost = req.headers['x-forwarded-host'] || UPSTREAM_HOST;
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log('info', 'proxy_request', { host: targetHost, method: req.method, path: req.url });
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// 已知需要 H2 的主机直接走 H2
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if (h2Hosts.has(targetHost)) {
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proxyViaH2(targetHost, req, res);
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return;
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}
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// 首次请求走 H1，如果秒挂自动切 H2
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await proxyViaH1(targetHost, req, res);
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}
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// ─── HTTP 服务器 ─────────────────────────────────────────
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const server = http.createServer((req, res) => {
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if (req.url === HEALTH_PATH) {
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res.writeHead(200, { 'content-type': 'application/json' });
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res.end(JSON.stringify({
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status: 'ok',
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upstream: UPSTREAM_HOST,
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node: process.version,
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openssl: process.versions.openssl,
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uptime: process.uptime(),
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h2Hosts: [...h2Hosts],
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}));
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return;
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}
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proxyRequest(req, res).catch((err) => {
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log('error', 'unhandled_error', { error: err.message });
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if (!res.headersSent) {
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res.writeHead(500, { 'content-type': 'application/json' });
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res.end(JSON.stringify({ error: 'internal_error' }));
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}
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});
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});
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server.timeout = 0;
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server.keepAliveTimeout = IDLE_TIMEOUT;
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server.headersTimeout = 60000;
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server.listen(LISTEN_PORT, LISTEN_HOST, () => {
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log('info', 'node-tls-proxy started', {
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listen: `${LISTEN_HOST}:${LISTEN_PORT}`,
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upstream: `${UPSTREAM_HOST}:443`,
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proxy: UPSTREAM_PROXY || '(direct)',
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node: process.version,
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openssl: process.versions.openssl,
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});
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});
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let shuttingDown = false;
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function shutdown(signal) {
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if (shuttingDown) return;
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shuttingDown = true;
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log('info', `received ${signal}, shutting down`);
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for (const s of h2Sessions.values()) s.close();
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h2Sessions.clear();
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server.close(() => process.exit(0));
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setTimeout(() => process.exit(1), 5000);
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}
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process.on('SIGTERM', () => shutdown('SIGTERM'));
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process.on('SIGINT', () => shutdown('SIGINT'));
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process.on('uncaughtException', (err) => log('error', 'uncaught', { error: err.message, stack: err.stack }));
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process.on('unhandledRejection', (r) => log('error', 'unhandled_rejection', { error: String(r) }));
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