mirror of
https://github.com/foxhui/WebAI2API.git
synced 2026-06-16 21:03:59 +08:00
foxhui
626 lines
25 KiB
JavaScript
626 lines
25 KiB
JavaScript
import http from 'http';
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import fs from 'fs';
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import path from 'path';
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import sharp from 'sharp';
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import { getBackend } from './lib/backend/index.js';
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import { getModelsForBackend, resolveModelId, getImagePolicy, IMAGE_POLICY } from './lib/backend/models.js';
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import { logger } from './lib/utils/logger.js';
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import crypto from 'crypto';
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import { spawn, spawnSync } from 'child_process';
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import os from 'os';
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import net from 'net';
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// ==================== 命令行参数处理 ====================
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/**
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* 检查命令是否存在
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* @param {string} cmd - 命令名称
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* @returns {boolean}
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*/
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function checkCommand(cmd) {
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const result = spawnSync('which', [cmd], { encoding: 'utf8' });
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return result.status === 0;
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}
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/**
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* 检查端口是否可用
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* @param {number} port - 端口号
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* @returns {Promise<boolean>}
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*/
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function isPortAvailable(port) {
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return new Promise((resolve) => {
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const server = net.createServer();
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server.once('error', () => {
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resolve(false);
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});
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server.once('listening', () => {
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server.close();
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resolve(true);
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});
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server.listen(port);
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});
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}
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/**
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* 查找可用的 VNC 端口
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* @param {number} startPort - 起始端口 (默认 5900)
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* @param {number} maxAttempts - 最大尝试次数 (默认 10)
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* @returns {Promise<number|null>}
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*/
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async function findAvailableVncPort(startPort = 5900, maxAttempts = 10) {
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for (let i = 0; i < maxAttempts; i++) {
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const port = startPort + i;
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if (await isPortAvailable(port)) {
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return port;
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}
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}
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return null;
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}
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/**
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* 处理 Xvfb 和 VNC 启动参数（仅 Linux）
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*/
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async function handleDisplayParams() {
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const args = process.argv.slice(2);
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const hasXvfb = args.includes('-xvfb');
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const hasVnc = args.includes('-vnc');
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const isInXvfb = process.env.XVFB_RUNNING === 'true';
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// -vnc 必须和 -xvfb 并用（但如果已在 Xvfb 中运行则允许）
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if (hasVnc && !hasXvfb && !isInXvfb) {
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logger.error('服务器', '-vnc 参数必须和 -xvfb 参数一起使用');
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logger.error('服务器', '正确用法: node server.js -xvfb -vnc');
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process.exit(1);
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}
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// 非 Linux 系统检查
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if ((hasXvfb || hasVnc) && os.platform() !== 'linux') {
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logger.warn('服务器', '忽略参数: -xvfb 和 -vnc 参数仅在 Linux 系统上支持');
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return;
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}
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// 处理 -xvfb 参数（或已在 Xvfb 中运行）
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if ((hasXvfb || isInXvfb) && os.platform() === 'linux') {
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// 检查 xvfb-run 是否存在（仅在首次启动时需要）
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if (hasXvfb && !isInXvfb) {
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if (!checkCommand('xvfb-run')) {
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logger.error('服务器', '未找到 xvfb-run 命令');
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logger.error('服务器', '请先安装 Xvfb:');
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logger.error('服务器', ' - Ubuntu/Debian: sudo apt install xvfb');
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logger.error('服务器', ' - CentOS/RHEL: sudo dnf install xorg-x11-server-Xvfb');
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process.exit(1);
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}
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}
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// 检查是否已在 Xvfb 中运行（通过环境变量判断）
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if (isInXvfb) {
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// 已在 Xvfb 中，继续正常启动
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logger.info('服务器', '已在 Xvfb 虚拟显示器中运行', { display: process.env.DISPLAY || ':99' });
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// 处理 VNC（如果需要）
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if (hasVnc) {
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if (!checkCommand('x11vnc')) {
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logger.error('服务器', '未找到 x11vnc 命令');
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logger.error('服务器', '请先安装 x11vnc:');
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logger.error('服务器', ' - Ubuntu/Debian: sudo apt install x11vnc');
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logger.error('服务器', ' - CentOS/RHEL: sudo dnf install x11vnc');
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process.exit(1);
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}
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const display = process.env.DISPLAY || ':99';
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// 自动查找可用端口 (从 5900 开始)
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logger.info('服务器', '正在查找可用的 VNC 端口...');
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const vncPort = await findAvailableVncPort(5900, 10);
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if (!vncPort) {
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logger.error('服务器', '无法找到可用的 VNC 端口 (已尝试 5900-5909)');
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process.exit(1);
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}
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logger.info('服务器', `正在启动 VNC 服务器 (端口 ${vncPort})...`);
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const vncProcess = spawn('x11vnc', [
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'-display', display,
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'-rfbport', vncPort.toString(),
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'-localhost',
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'-nopw',
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'-once',
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'-noxdamage',
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'-ncache', '10',
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'-forever'
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], {
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stdio: 'ignore', // 忽略 VNC 的输出，避免混入日志
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detached: false
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});
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vncProcess.on('error', (err) => {
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logger.error('服务器', 'VNC 启动失败', { error: err.message });
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});
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// 处理进程退出信号
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process.on('SIGINT', () => {
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vncProcess.kill('SIGTERM');
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process.exit(0);
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});
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process.on('SIGTERM', () => {
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vncProcess.kill('SIGTERM');
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process.exit(0);
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});
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logger.info('服务器', 'VNC 服务器已成功启动');
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logger.warn('服务器', `VNC 连接端口: ${vncPort}`);
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}
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return;
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}
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// 需要在 Xvfb 中重启
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logger.info('服务器', '正在启动 Xvfb 虚拟显示器...');
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// 构建新的参数列表（移除 -xvfb，保留其他参数如 -vnc、-login 等）
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const newArgs = args.filter(arg => arg !== '-xvfb');
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// 使用 env 命令来确保环境变量被正确传递
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const xvfbArgs = [
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'--server-num=99',
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'--server-args=-ac -screen 0 1366x768x24',
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'env',
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'XVFB_RUNNING=true',
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'DISPLAY=:99',
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process.argv[0], // node 可执行文件
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process.argv[1], // server.js 路径
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...newArgs
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];
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const xvfbProcess = spawn('xvfb-run', xvfbArgs, {
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stdio: 'inherit'
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});
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xvfbProcess.on('error', (err) => {
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logger.error('服务器', 'Xvfb 启动失败', { error: err.message });
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process.exit(1);
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});
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xvfbProcess.on('exit', (code) => {
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process.exit(code || 0);
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});
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// 处理父进程退出信号
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process.on('SIGINT', () => {
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xvfbProcess.kill('SIGTERM');
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});
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process.on('SIGTERM', () => {
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xvfbProcess.kill('SIGTERM');
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});
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// 不再继续执行后续代码
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return 'XVFB_REDIRECT';
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}
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}
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// 执行参数处理
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const displayResult = await handleDisplayParams();
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if (displayResult === 'XVFB_REDIRECT') {
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// 已经重定向到 Xvfb，不再继续执行
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// 这个进程将等待子进程退出
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// eslint-disable-next-line no-process-exit
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process.on('exit', () => { });
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// 阻止继续执行
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await new Promise(() => { });
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}
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// ==================== 服务器主逻辑 ====================
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// 使用统一后端获取配置和函数
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const { config, name, initBrowser, generateImage, TEMP_DIR } = getBackend();
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const PORT = config.server.port || 3000;
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const AUTH_TOKEN = config.server.auth;
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const KEEPALIVE_ENABLED = config.server.keepalive?.enable ?? true;
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const KEEPALIVE_MODE = config.server.keepalive?.mode || 'comment';
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// --- 全局状态 ---
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let browserContext = null; // 浏览器上下文 {browser, page, client, width, height}
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const queue = []; // 请求队列
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let processingCount = 0; // 当前正在处理的任务数
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const MAX_CONCURRENT = config.queue?.maxConcurrent || 1; // 从配置读取
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const MAX_QUEUE_SIZE = config.queue?.maxQueueSize || 2; // 从配置读取
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const IMAGE_LIMIT = config.queue?.imageLimit || 5; // 图片数量上限
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/**
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* 处理队列中的任务
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*/
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async function processQueue() {
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// 如果正在处理的任务已满,或队列为空,则停止
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if (processingCount >= MAX_CONCURRENT || queue.length === 0) return;
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// 取出下一个任务
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const task = queue.shift();
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processingCount++;
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try {
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const { req, res, prompt, imagePaths, modelId, modelName, id, isStreaming } = task;
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logger.info('服务器', '[队列] 开始处理任务', { id, remaining: queue.length });
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// 如果是流式，启动心跳
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let heartbeatInterval = null;
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if (isStreaming) {
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heartbeatInterval = setInterval(() => {
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if (res.writableEnded) {
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clearInterval(heartbeatInterval);
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return;
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}
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// 发送心跳包
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if (KEEPALIVE_MODE === 'comment') {
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res.write(`:keepalive\n\n`);
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} else {
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// content 模式：发送空 delta
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const chunk = {
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id: 'chatcmpl-' + Date.now(),
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object: 'chat.completion.chunk',
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created: Math.floor(Date.now() / 1000),
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model: modelName || 'default-model',
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choices: [{
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index: 0,
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delta: { content: '' },
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finish_reason: null
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}]
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};
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res.write(`data: ${JSON.stringify(chunk)}\n\n`);
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}
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}, 3000);
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}
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// 确保浏览器已初始化
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if (!browserContext) {
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browserContext = await initBrowser(config);
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}
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// 调用核心生图逻辑
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const result = await generateImage(browserContext, prompt, imagePaths, modelId, { id });
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// 清除心跳
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if (heartbeatInterval) clearInterval(heartbeatInterval);
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// 处理结果
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let finalContent = '';
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if (result.error) {
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// 特殊错误处理:reCAPTCHA
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if (result.error === 'recaptcha validation failed') {
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if (isStreaming) {
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res.write(`data: ${JSON.stringify({ error: 'recaptcha validation failed' })}\n\n`);
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res.write(`data: [DONE]\n\n`);
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res.end();
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} else {
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res.writeHead(500, { 'Content-Type': 'application/json' });
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res.end(JSON.stringify({ error: 'recaptcha validation failed' }));
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}
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return;
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}
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finalContent = `[生成错误] ${result.error}`;
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} else if (result.image) {
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try {
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// result.image 已经是 "data:image/png;base64,..." 格式
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// 构造 Markdown 图片展示 (Data URI)
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finalContent = ``;
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logger.info('服务器', '图片已准备就绪 (Base64)', { id });
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} catch (e) {
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logger.error('服务器', '图片处理失败', { id, error: e.message });
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finalContent = `[图片处理失败] ${e.message}`;
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}
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} else {
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finalContent = result.text || '生成失败';
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}
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// 发送响应
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if (isStreaming) {
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// 流式响应
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const chunk = {
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id: 'chatcmpl-' + Date.now(),
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object: 'chat.completion.chunk',
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created: Math.floor(Date.now() / 1000),
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model: modelName || 'default-model',
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choices: [{
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index: 0,
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delta: { content: finalContent },
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finish_reason: 'stop'
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}]
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};
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res.write(`data: ${JSON.stringify(chunk)}\n\n`);
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res.write(`data: [DONE]\n\n`);
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res.end();
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} else {
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// 非流式响应
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const response = {
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id: 'chatcmpl-' + Date.now(),
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object: 'chat.completion',
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created: Math.floor(Date.now() / 1000),
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model: modelName || 'default-model',
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choices: [{
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index: 0,
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message: {
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role: 'assistant',
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content: finalContent
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},
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finish_reason: 'stop'
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}]
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};
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res.writeHead(200, { 'Content-Type': 'application/json' });
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res.end(JSON.stringify(response));
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}
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} catch (err) {
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logger.error('服务器', '任务处理失败', { id: task.id, error: err.message });
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if (task.isStreaming) {
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if (!task.res.writableEnded) {
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task.res.write(`data: ${JSON.stringify({ error: err.message })}\n\n`);
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task.res.write(`data: [DONE]\n\n`);
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task.res.end();
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}
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} else {
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if (!task.res.writableEnded) {
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task.res.writeHead(500, { 'Content-Type': 'application/json' });
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task.res.end(JSON.stringify({ error: err.message }));
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}
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}
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} finally {
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// 无论成功失败，都尝试清理临时图片
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if (task && task.imagePaths) {
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for (const p of task.imagePaths) {
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try { fs.unlinkSync(p); } catch (e) { }
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}
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}
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processingCount--;
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// 递归处理下一个任务
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processQueue();
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}
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}
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/**
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* 启动 HTTP 服务器
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*/
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async function startServer() {
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// 预先启动浏览器
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try {
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browserContext = await initBrowser(config);
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} catch (err) {
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logger.error('服务器', '浏览器初始化失败', { error: err.message });
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process.exit(1);
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}
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const server = http.createServer(async (req, res) => {
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// 为每个请求生成唯一 ID
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const id = crypto.randomUUID().slice(0, 8);
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// --- 鉴权中间件 ---
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const authHeader = req.headers['authorization'];
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if (!authHeader || authHeader !== `Bearer ${AUTH_TOKEN}`) {
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res.writeHead(401, { 'Content-Type': 'application/json' });
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res.end(JSON.stringify({ error: 'Unauthorized' }));
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return;
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}
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// --- 路由分发 ---
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// 1. 模型列表接口
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if (req.method === 'GET' && req.url === '/v1/models') {
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const models = getModelsForBackend(name);
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res.writeHead(200, { 'Content-Type': 'application/json' });
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res.end(JSON.stringify(models));
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return;
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}
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// 2. 聊天补全接口
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if (req.method === 'POST' && req.url.startsWith('/v1/chat/completions')) {
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const chunks = [];
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req.on('data', chunk => chunks.push(chunk));
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req.on('end', async () => {
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try {
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const body = Buffer.concat(chunks).toString();
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const data = JSON.parse(body);
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const messages = data.messages;
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const isStreaming = data.stream === true;
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// Stream 参数验证
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if (KEEPALIVE_ENABLED && !isStreaming) {
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res.writeHead(400, { 'Content-Type': 'application/json' });
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res.end(JSON.stringify({ error: 'Stream mode is required when keepalive is enabled. Please set "stream": true in your request.' }));
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return;
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}
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// 限流检查（仅在未开启 keepalive 时限制）
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if (!KEEPALIVE_ENABLED && processingCount + queue.length >= MAX_CONCURRENT + MAX_QUEUE_SIZE) {
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logger.warn('服务器', '请求过多，已拒绝 (最大队列限制)', { id });
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res.writeHead(429, { 'Content-Type': 'application/json' });
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res.end(JSON.stringify({ error: 'Too Many Requests. Server is busy.' }));
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return;
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}
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// 如果是流式，设置 SSE 响应头
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if (isStreaming) {
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res.writeHead(200, {
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'Content-Type': 'text/event-stream',
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'Cache-Control': 'no-cache',
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'Connection': 'keep-alive'
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});
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}
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if (!messages || messages.length === 0) {
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if (isStreaming) {
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res.write(`data: ${JSON.stringify({ error: 'No messages' })}\n\n`);
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res.write(`data: [DONE]\n\n`);
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res.end();
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} else {
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res.writeHead(400, { 'Content-Type': 'application/json' });
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res.end(JSON.stringify({ error: 'No messages' }));
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}
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return;
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}
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// 筛选用户消息
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const userMessages = messages.filter(m => m.role === 'user');
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if (userMessages.length === 0) {
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if (isStreaming) {
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res.write(`data: ${JSON.stringify({ error: 'No user messages' })}\n\n`);
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res.write(`data: [DONE]\n\n`);
|
||
res.end();
|
||
} else {
|
||
res.writeHead(400, { 'Content-Type': 'application/json' });
|
||
res.end(JSON.stringify({ error: 'No user messages' }));
|
||
}
|
||
return;
|
||
}
|
||
const lastMessage = userMessages[userMessages.length - 1];
|
||
|
||
let prompt = '';
|
||
const imagePaths = [];
|
||
let imageCount = 0;
|
||
|
||
// 解析内容 (拼接文本 + 处理图片)
|
||
if (Array.isArray(lastMessage.content)) {
|
||
for (const item of lastMessage.content) {
|
||
if (item.type === 'text') {
|
||
prompt += item.text + ' ';
|
||
} else if (item.type === 'image_url' && item.image_url && item.image_url.url) {
|
||
imageCount++;
|
||
|
||
// 逻辑:
|
||
// 1. 如果配置限制 <= 10 (浏览器硬限制), 则严格执行, 超过报错
|
||
// 2. 如果配置限制 > 10, 则视为用户想"尽力而为", 自动截断到 10 张, 忽略多余的
|
||
|
||
if (IMAGE_LIMIT <= 10) {
|
||
if (imageCount > IMAGE_LIMIT) {
|
||
const errorMsg = `Too many images. Maximum ${IMAGE_LIMIT} images allowed.`;
|
||
logger.warn('server', errorMsg, { id });
|
||
if (isStreaming) {
|
||
res.write(`data: ${JSON.stringify({ error: errorMsg })}\n\n`);
|
||
res.write(`data: [DONE]\n\n`);
|
||
res.end();
|
||
} else {
|
||
res.writeHead(400, { 'Content-Type': 'application/json' });
|
||
res.end(JSON.stringify({ error: errorMsg }));
|
||
}
|
||
return;
|
||
}
|
||
} else {
|
||
// IMAGE_LIMIT > 10
|
||
if (imageCount > 10) {
|
||
// 超过浏览器硬限制, 忽略该图片
|
||
continue;
|
||
}
|
||
}
|
||
|
||
const url = item.image_url.url;
|
||
if (url.startsWith('data:image')) {
|
||
const matches = url.match(/^data:([A-Za-z-+\/]+);base64,(.+)$/);
|
||
if (matches && matches.length === 3) {
|
||
const buffer = Buffer.from(matches[2], 'base64');
|
||
// 压缩图片
|
||
const processedBuffer = await sharp(buffer)
|
||
.jpeg({ quality: 90 })
|
||
.toBuffer();
|
||
|
||
const filename = `img_${Date.now()}_${Math.random().toString(36).substring(7)}.jpg`;
|
||
const filePath = path.join(TEMP_DIR, filename);
|
||
fs.writeFileSync(filePath, processedBuffer);
|
||
imagePaths.push(filePath);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
} else {
|
||
prompt = lastMessage.content; // 回落保留
|
||
}
|
||
|
||
prompt = prompt.trim();
|
||
|
||
// 解析模型参数
|
||
let modelId = null;
|
||
if (data.model) {
|
||
modelId = resolveModelId(name, data.model);
|
||
if (modelId) {
|
||
logger.info('服务器', `触发模型: ${data.model} (${modelId})`, { id });
|
||
} else {
|
||
const errorMsg = `Invalid model for backend ${name}: ${data.model}`;
|
||
logger.warn('服务器', errorMsg, { id });
|
||
if (isStreaming) {
|
||
res.write(`data: ${JSON.stringify({ error: errorMsg })}\n\n`);
|
||
res.write(`data: [DONE]\n\n`);
|
||
res.end();
|
||
} else {
|
||
res.writeHead(400, { 'Content-Type': 'application/json' });
|
||
res.end(JSON.stringify({ error: errorMsg }));
|
||
}
|
||
return;
|
||
}
|
||
} else {
|
||
logger.info('服务器', '未指定模型，使用网页默认', { id });
|
||
}
|
||
|
||
// 图片策略校验
|
||
const hasImage = imagePaths.length > 0;
|
||
const policy = data.model ? getImagePolicy(name, data.model) : IMAGE_POLICY.OPTIONAL;
|
||
|
||
if (policy === IMAGE_POLICY.REQUIRED && !hasImage) {
|
||
const errorMsg = `Model ${data.model} requires a reference image.`;
|
||
logger.warn('服务器', errorMsg, { id });
|
||
if (isStreaming) {
|
||
res.write(`data: ${JSON.stringify({ error: errorMsg })}\n\n`);
|
||
res.write(`data: [DONE]\n\n`);
|
||
res.end();
|
||
} else {
|
||
res.writeHead(400, { 'Content-Type': 'application/json' });
|
||
res.end(JSON.stringify({ error: errorMsg }));
|
||
}
|
||
return;
|
||
}
|
||
|
||
if (policy === IMAGE_POLICY.FORBIDDEN && hasImage) {
|
||
const errorMsg = `Model ${data.model} does not accept images.`;
|
||
logger.warn('服务器', errorMsg, { id });
|
||
if (isStreaming) {
|
||
res.write(`data: ${JSON.stringify({ error: errorMsg })}\n\n`);
|
||
res.write(`data: [DONE]\n\n`);
|
||
res.end();
|
||
} else {
|
||
res.writeHead(400, { 'Content-Type': 'application/json' });
|
||
res.end(JSON.stringify({ error: errorMsg }));
|
||
}
|
||
return;
|
||
}
|
||
|
||
logger.info('服务器', `[队列] 请求入队: ${prompt.slice(0, 10)}...`, { id, images: imagePaths.length });
|
||
|
||
// 将任务加入队列
|
||
queue.push({ req, res, prompt, imagePaths, modelId, modelName: data.model || null, id, isStreaming });
|
||
|
||
// 触发队列处理
|
||
processQueue();
|
||
|
||
} catch (err) {
|
||
logger.error('服务器', '服务器处理失败', { id, error: err.message });
|
||
if (!res.writableEnded) {
|
||
res.writeHead(500, { 'Content-Type': 'application/json' });
|
||
res.end(JSON.stringify({ error: err.message }));
|
||
}
|
||
}
|
||
});
|
||
} else {
|
||
res.writeHead(404);
|
||
res.end();
|
||
}
|
||
});
|
||
|
||
server.listen(PORT, () => {
|
||
logger.info('服务器', `HTTP 服务器启动成功，监听端口 ${PORT}`);
|
||
logger.info('服务器', `流式保活: ${KEEPALIVE_ENABLED ? '已启用 (' + KEEPALIVE_MODE + ' 模式)' : '已禁用'}`);
|
||
logger.info('服务器', `最大队列: ${MAX_QUEUE_SIZE}，最大图片数量: ${IMAGE_LIMIT}`);
|
||
});
|
||
}
|
||
|
||
startServer();
|