nodejs如何实现类似php的opendir目录相互隔离的fastcgi多租户虚拟空间？

在Node.js中实现类似PHP FastCGI的多租户虚拟空间需要考虑进程隔离、文件系统隔离和资源限制。以下是完整的实现方案：

1. 主控制器（Master Process）

// master.js
const cluster = require('cluster');
const fs = require('fs');
const path = require('path');
const http = require('http');
const { Worker } = require('worker_threads');

class VirtualHostManager {
    constructor() {
        this.tenants = new Map();
        this.workers = new Map();
    }

    // 注册租户
    registerTenant(tenantId, config) {
        this.tenants.set(tenantId, {
            id: tenantId,
            rootDir: config.rootDir,
            uid: config.uid,
            gid: config.gid,
            maxMemory: config.maxMemory || 128 * 1024 * 1024, // 128MB
            maxCpu: config.maxCpu || 0.5,
            domain: config.domain,
            port: config.port
        });
    }

    // 为每个租户创建隔离的工作进程
    spawnTenantWorker(tenantId) {
        const tenant = this.tenants.get(tenantId);
        if (!tenant) return;

        if (cluster.isMaster) {
            const worker = cluster.fork({
                TENANT_ID: tenantId,
                TENANT_ROOT: tenant.rootDir,
                TENANT_UID: tenant.uid,
                TENANT_GID: tenant.gid,
                NODE_OPTIONS: `--max-old-space-size=${Math.floor(tenant.maxMemory / 1024 / 1024)}`
            });

            this.workers.set(tenantId, worker);

            worker.on('exit', (code, signal) => {
                console.log(`Tenant ${tenantId} worker died, restarting...`);
                this.spawnTenantWorker(tenantId);
            });
        }
    }
}

2. 沙箱环境（Sandbox）

// sandbox.js
const vm = require('vm');
const fs = require('fs');
const path = require('path');
const { promisify } = require('util');

class TenantSandbox {
    constructor(tenantConfig) {
        this.tenantId = tenantConfig.id;
        this.rootDir = tenantConfig.rootDir;
        this.uid = tenantConfig.uid;
        this.gid = tenantConfig.gid;
        this.context = this.createContext();
    }

    // 创建隔离的执行上下文
    createContext() {
        const sandbox = {
            console: console,
            setTimeout: setTimeout,
            setInterval: setInterval,
            clearTimeout: clearTimeout,
            clearInterval: clearInterval,
            Buffer: Buffer,
            process: {
                env: {},
                version: process.version,
                platform: process.platform,
                arch: process.arch,
                cwd: () => this.rootDir,
                memoryUsage: process.memoryUsage
            },
            require: this.createSafeRequire(),
            __dirname: this.rootDir,
            __filename: ''
        };

        // 添加安全的文件系统API
        sandbox.fs = this.createSafeFS();

        return vm.createContext(sandbox);
    }

    // 创建受限的require函数
    createSafeRequire() {
        const allowedModules = ['http', 'https', 'url', 'querystring', 'crypto'];

        return (moduleName) => {
            // 只允许加载白名单模块
            if (allowedModules.includes(moduleName)) {
                return require(moduleName);
            }

            // 检查是否是相对路径模块
            if (moduleName.startsWith('./') || moduleName.startsWith('../')) {
                const modulePath = path.resolve(this.rootDir, moduleName);

                // 确保模块在租户目录内
                if (!modulePath.startsWith(this.rootDir)) {
                    throw new Error(`Access denied: ${moduleName}`);
                }

                return require(modulePath);
            }

            throw new Error(`Module not allowed: ${moduleName}`);
        };
    }

    // 创建受限的文件系统API
    createSafeFS() {
        const safeFS = {};
        const self = this;

        // 包装fs方法，限制在租户目录内
        const wrapFSMethod = (method) => {
            return (...args) => {
                // 检查路径参数
                if (args[0] && typeof args[0] === 'string') {
                    const resolvedPath =...

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