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{"version":3,"sources":["../../src/scripts/server.ts","../../src/index.ts"],"sourcesContent":["#!/usr/bin/env node\n\nimport { PGlite, DebugLevel } from '@electric-sql/pglite'\nimport type { Extension, Extensions } from '@electric-sql/pglite'\nimport { PGLiteSocketServer } from '../index'\nimport { parseArgs } from 'node:util'\nimport { spawn, ChildProcess } from 'node:child_process'\n\n// Define command line argument options\nconst args = parseArgs({\n options: {\n db: {\n type: 'string',\n short: 'd',\n default: 'memory://',\n help: 'Database path (relative or absolute). Use memory:// for in-memory database.',\n },\n port: {\n type: 'string',\n short: 'p',\n default: '5432',\n help: 'Port to listen on',\n },\n host: {\n type: 'string',\n short: 'h',\n default: '127.0.0.1',\n help: 'Host to bind to',\n },\n path: {\n type: 'string',\n short: 'u',\n default: undefined,\n help: 'unix socket to bind to. Takes precedence over host:port',\n },\n debug: {\n type: 'string',\n short: 'v',\n default: '0',\n help: 'Debug level (0-5)',\n },\n extensions: {\n type: 'string',\n short: 'e',\n default: undefined,\n help: 'Comma-separated list of extensions to load (e.g., vector,pgcrypto,postgis etc.)',\n },\n run: {\n type: 'string',\n short: 'r',\n default: undefined,\n help: 'Command to run after server starts',\n },\n 'include-database-url': {\n type: 'boolean',\n default: false,\n help: 'Include DATABASE_URL in the environment of the subprocess',\n },\n 'shutdown-timeout': {\n type: 'string',\n default: '5000',\n help: 'Timeout in milliseconds for graceful subprocess shutdown (default: 5000)',\n },\n 'max-connections': {\n type: 'string',\n short: 'm',\n default: '1',\n help: 'Maximum concurrent connections (default: 1)',\n },\n help: {\n type: 'boolean',\n short: '?',\n default: false,\n help: 'Show help',\n },\n },\n})\n\nconst help = `PGlite Socket Server\nUsage: pglite-server [options]\n\nOptions:\n -d, --db=PATH Database path (default: memory://)\n -p, --port=PORT Port to listen on (default: 5432)\n -h, --host=HOST Host to bind to (default: 127.0.0.1)\n -u, --path=UNIX Unix socket to bind to (default: undefined). Takes precedence over host:port\n -v, --debug=LEVEL Debug level 0-5 (default: 0)\n -e, --extensions=LIST Comma-separated list of extensions to load\n Formats: vector, pgcrypto (built-in/contrib)\n @org/package/path:exportedName (npm package)\n -r, --run=COMMAND Command to run after server starts\n --include-database-url Include DATABASE_URL in subprocess environment\n --shutdown-timeout=MS Timeout for graceful subprocess shutdown in ms (default: 5000)\n -m, --max-connections=N Maximum concurrent connections (default is no concurrency: 1)\n`\n\ninterface ServerConfig {\n dbPath: string\n port: number\n host: string\n path?: string\n debugLevel: DebugLevel\n extensionNames?: string[]\n runCommand?: string\n includeDatabaseUrl: boolean\n shutdownTimeout: number\n maxConnections: number\n}\n\nclass PGLiteServerRunner {\n private config: ServerConfig\n private db: PGlite | null = null\n private server: PGLiteSocketServer | null = null\n private subprocessManager: SubprocessManager | null = null\n\n constructor(config: ServerConfig) {\n this.config = config\n }\n\n static parseConfig(): ServerConfig {\n const extensionsArg = args.values.extensions as string | undefined\n return {\n dbPath: args.values.db as string,\n port: parseInt(args.values.port as string, 10),\n host: args.values.host as string,\n path: args.values.path as string,\n debugLevel: parseInt(args.values.debug as string, 10) as DebugLevel,\n extensionNames: extensionsArg\n ? extensionsArg.split(',').map((e) => e.trim())\n : undefined,\n runCommand: args.values.run as string,\n includeDatabaseUrl: args.values['include-database-url'] as boolean,\n shutdownTimeout: parseInt(args.values['shutdown-timeout'] as string, 10),\n maxConnections: parseInt(args.values['max-connections'] as string, 10),\n }\n }\n\n private createDatabaseUrl(): string {\n const { host, port, path } = this.config\n\n if (path) {\n // Unix socket connection\n const socketDir = path.endsWith('/.s.PGSQL.5432')\n ? path.slice(0, -13)\n : path\n return `postgresql://postgres:postgres@/postgres?host=${encodeURIComponent(socketDir)}`\n } else {\n // TCP connection\n return `postgresql://postgres:postgres@${host}:${port}/postgres`\n }\n }\n\n private async importExtensions(): Promise<Extensions | undefined> {\n if (!this.config.extensionNames?.length) {\n return undefined\n }\n\n const extensions: Extensions = {}\n\n // Built-in extensions that are not in contrib\n const builtInExtensions = [\n 'vector',\n 'live',\n 'pg_hashids',\n 'pg_ivm',\n 'pg_uuidv7',\n 'pgtap',\n 'age',\n 'pg_textsearch',\n ]\n\n for (const name of this.config.extensionNames) {\n let ext: Extension | null = null\n\n try {\n // Check if this is a custom package path (contains ':')\n // Format: @org/package/path:exportedName or package/path:exportedName\n if (name.includes(':')) {\n const [packagePath, exportName] = name.split(':')\n if (!packagePath || !exportName) {\n throw new Error(\n `Invalid extension format '${name}'. Expected: package/path:exportedName`,\n )\n }\n const mod = await import(packagePath)\n ext = mod[exportName] as Extension\n if (ext) {\n extensions[exportName] = ext\n console.log(\n `Imported extension '${exportName}' from '${packagePath}'`,\n )\n }\n } else if (builtInExtensions.includes(name)) {\n // Built-in extension (e.g., @electric-sql/pglite/vector)\n const mod = await import(`@electric-sql/pglite/${name}`)\n ext = mod[name] as Extension\n if (ext) {\n extensions[name] = ext\n console.log(`Imported extension: ${name}`)\n }\n } else {\n // Try contrib first (e.g., @electric-sql/pglite/contrib/pgcrypto)\n try {\n const mod = await import(`@electric-sql/pglite/contrib/${name}`)\n ext = mod[name] as Extension\n } catch {\n // Fall back to external package (e.g., @electric-sql/pglite-<extension>)\n const mod = await import(`@electric-sql/pglite-${name}`)\n ext = mod[name] as Extension\n }\n if (ext) {\n extensions[name] = ext\n console.log(`Imported extension: ${name}`)\n }\n }\n } catch (error) {\n console.error(`Failed to import extension '${name}':`, error)\n throw new Error(`Failed to import extension '${name}'`)\n }\n }\n\n return Object.keys(extensions).length > 0 ? extensions : undefined\n }\n\n private async initializeDatabase(): Promise<void> {\n console.log(`Initializing PGLite with database: ${this.config.dbPath}`)\n console.log(`Debug level: ${this.config.debugLevel}`)\n\n const extensions = await this.importExtensions()\n\n this.db = new PGlite(this.config.dbPath, {\n debug: this.config.debugLevel,\n extensions,\n })\n await this.db.waitReady\n console.log('PGlite database initialized')\n }\n\n private setupServerEventHandlers(): void {\n if (!this.server || !this.subprocessManager) {\n throw new Error('Server or subprocess manager not initialized')\n }\n\n this.server.addEventListener('listening', (event) => {\n const detail = (\n event as CustomEvent<{ port: number; host: string } | { host: string }>\n ).detail\n console.log(`PGLiteSocketServer listening on ${JSON.stringify(detail)}`)\n\n // Run the command after server starts listening\n if (this.config.runCommand && this.subprocessManager) {\n const databaseUrl = this.createDatabaseUrl()\n this.subprocessManager.spawn(\n this.config.runCommand,\n databaseUrl,\n this.config.includeDatabaseUrl,\n )\n }\n })\n\n this.server.addEventListener('connection', (event) => {\n const { clientAddress, clientPort } = (\n event as CustomEvent<{ clientAddress: string; clientPort: number }>\n ).detail\n console.log(`Client connected from ${clientAddress}:${clientPort}`)\n })\n\n this.server.addEventListener('error', (event) => {\n const error = (event as CustomEvent<Error>).detail\n console.error('Socket server error:', error)\n })\n }\n\n private setupSignalHandlers(): void {\n process.on('SIGINT', () => this.shutdown())\n process.on('SIGTERM', () => this.shutdown())\n }\n\n async start(): Promise<void> {\n try {\n // Initialize database\n await this.initializeDatabase()\n\n if (!this.db) {\n throw new Error('Database initialization failed')\n }\n\n // Create and setup the socket server\n this.server = new PGLiteSocketServer({\n db: this.db,\n port: this.config.port,\n host: this.config.host,\n path: this.config.path,\n inspect: this.config.debugLevel > 0,\n maxConnections: this.config.maxConnections,\n })\n\n // Create subprocess manager\n this.subprocessManager = new SubprocessManager((exitCode) => {\n this.shutdown(exitCode)\n })\n\n // Setup event handlers\n this.setupServerEventHandlers()\n this.setupSignalHandlers()\n\n // Start the server\n await this.server.start()\n } catch (error) {\n console.error('Failed to start PGLiteSocketServer:', error)\n throw error\n }\n }\n\n async shutdown(exitCode: number = 0): Promise<void> {\n console.log('\\nShutting down PGLiteSocketServer...')\n\n // Terminate subprocess if running\n if (this.subprocessManager) {\n this.subprocessManager.terminate(this.config.shutdownTimeout)\n }\n\n // Stop server\n if (this.server) {\n await this.server.stop()\n }\n\n // Close database\n if (this.db) {\n await this.db.close()\n }\n\n console.log('Server stopped')\n process.exit(exitCode)\n }\n}\n\nclass SubprocessManager {\n private childProcess: ChildProcess | null = null\n private onExit: (code: number) => void\n\n constructor(onExit: (code: number) => void) {\n this.onExit = onExit\n }\n\n get process(): ChildProcess | null {\n return this.childProcess\n }\n\n spawn(\n command: string,\n databaseUrl: string,\n includeDatabaseUrl: boolean,\n ): void {\n console.log(`Running command: ${command}`)\n\n // Prepare environment variables\n const env = { ...process.env }\n if (includeDatabaseUrl) {\n env.DATABASE_URL = databaseUrl\n console.log(`Setting DATABASE_URL=${databaseUrl}`)\n }\n\n // Parse and spawn the command\n const commandParts = command.trim().split(/\\s+/)\n this.childProcess = spawn(commandParts[0], commandParts.slice(1), {\n env,\n stdio: 'inherit',\n })\n\n this.childProcess.on('error', (error) => {\n console.error('Error running command:', error)\n // If subprocess fails to start, shutdown the server\n console.log('Subprocess failed to start, shutting down...')\n this.onExit(1)\n })\n\n this.childProcess.on('close', (code) => {\n console.log(`Command exited with code ${code}`)\n this.childProcess = null\n\n // If child process exits with non-zero code, notify parent\n if (code !== null && code !== 0) {\n console.log(\n `Child process failed with exit code ${code}, shutting down...`,\n )\n this.onExit(code)\n }\n })\n }\n\n terminate(timeout: number): void {\n if (this.childProcess) {\n console.log('Terminating child process...')\n this.childProcess.kill('SIGTERM')\n\n // Give it a moment to exit gracefully, then force kill if needed\n setTimeout(() => {\n if (this.childProcess && !this.childProcess.killed) {\n console.log('Force killing child process...')\n this.childProcess.kill('SIGKILL')\n }\n }, timeout)\n }\n }\n}\n\n// Main execution\nasync function main() {\n // Show help and exit if requested\n if (args.values.help) {\n console.log(help)\n process.exit(0)\n }\n\n try {\n const config = PGLiteServerRunner.parseConfig()\n const serverRunner = new PGLiteServerRunner(config)\n await serverRunner.start()\n } catch (error) {\n console.error('Unhandled error:', error)\n process.exit(1)\n }\n}\n\n// Run the main function\nmain()\n","import type { PGlite } from '@electric-sql/pglite'\nimport { type Server, type Socket, createServer } from 'net'\n\n// Connection queue timeout in milliseconds\nexport const CONNECTION_QUEUE_TIMEOUT = 60000 // 60 seconds\n\n/**\n * Represents a queued query waiting for PGlite access\n */\ninterface QueuedQuery {\n handlerId: number\n message: Uint8Array\n resolve: (resultSize: number) => void\n reject: (error: Error) => void\n timestamp: number\n onData: (data: Uint8Array) => void\n}\n\n/**\n * Global query queue manager\n * Ensures only one query executes at a time in PGlite\n */\nclass QueryQueueManager {\n private queue: QueuedQuery[] = []\n private processing = false\n private db: PGlite\n private debug: boolean\n private lastHandlerId: null | number = null\n\n constructor(db: PGlite, debug = false) {\n this.db = db\n this.debug = debug\n }\n\n private log(message: string, ...args: any[]): void {\n if (this.debug) {\n console.log(`[QueryQueueManager] ${message}`, ...args)\n }\n }\n\n async enqueue(\n handlerId: number,\n message: Uint8Array,\n onData: (data: Uint8Array) => void,\n ): Promise<number> {\n return new Promise((resolve, reject) => {\n const query: QueuedQuery = {\n handlerId,\n message,\n resolve,\n reject,\n timestamp: Date.now(),\n onData,\n }\n\n this.queue.push(query)\n this.log(\n `enqueued query from handler #${handlerId}, queue size: ${this.queue.length}`,\n )\n\n // Process queue if not already processing\n if (!this.processing) {\n this.processQueue()\n }\n })\n }\n\n private async processQueue(): Promise<void> {\n if (this.processing || this.queue.length === 0) {\n return\n }\n\n this.processing = true\n\n while (this.queue.length > 0) {\n let query\n\n if (this.db.isInTransaction() && this.lastHandlerId) {\n const i = this.queue.findIndex(\n (q) => q.handlerId === this.lastHandlerId,\n )\n if (i === -1) {\n // we didn't find any other query from the same client!\n this.log(\n `transaction started, but no query from the same handler id found in queue`,\n this.lastHandlerId,\n )\n query = null\n } else {\n query = this.queue.splice(i, 1)[0]\n }\n } else {\n query = this.queue.shift()\n }\n if (!query) break\n\n const waitTime = Date.now() - query.timestamp\n this.log(\n `processing query from handler #${query.handlerId} (waited ${waitTime}ms)`,\n )\n\n let result = 0\n try {\n // Execute the query with exclusive access to PGlite\n await this.db.runExclusive(async () => {\n return await this.db.execProtocolRawStream(query.message, {\n onRawData: (data) => {\n result += data.length\n query.onData(data)\n },\n })\n })\n } catch (error) {\n this.log(`query from handler #${query.handlerId} failed:`, error)\n query.reject(error as Error)\n return\n }\n\n this.log(\n `query from handler #${query.handlerId} completed, ${result} bytes`,\n )\n this.lastHandlerId = query.handlerId\n query.resolve(result)\n }\n\n this.processing = false\n this.log(`queue processing complete, queue length is`, this.queue.length)\n }\n\n getQueueLength(): number {\n return this.queue.length\n }\n\n clearQueueForHandler(handlerId: number): void {\n const before = this.queue.length\n this.queue = this.queue.filter((q) => {\n if (q.handlerId === handlerId) {\n q.reject(new Error('Handler disconnected'))\n return false\n }\n return true\n })\n const removed = before - this.queue.length\n if (removed > 0) {\n this.log(`cleared ${removed} queries for handler #${handlerId}`)\n }\n }\n\n async clearTransactionIfNeeded(handlerId: number): Promise<void> {\n if (this.db.isInTransaction() && this.lastHandlerId === handlerId) {\n await this.db.exec('ROLLBACK')\n this.lastHandlerId = null\n await this.processQueue()\n }\n }\n}\n\n/**\n * Options for creating a PGLiteSocketHandler\n */\nexport interface PGLiteSocketHandlerOptions {\n /** The query queue manager */\n queryQueue: QueryQueueManager\n /** Whether to close the socket when detached (default: false) */\n closeOnDetach?: boolean\n /** Print the incoming and outgoing data to the console in hex and ascii */\n inspect?: boolean\n /** Enable debug logging of method calls */\n debug?: boolean\n /** Idle timeout in ms (0 to disable, default: 0) */\n idleTimeout?: number\n}\n\n/**\n * Handler for a single socket connection to PGlite\n * Each connection can remain open and send multiple queries\n */\nexport class PGLiteSocketHandler extends EventTarget {\n private queryQueue: QueryQueueManager\n private socket: Socket | null = null\n private active = false\n private closeOnDetach: boolean\n private inspect: boolean\n private debug: boolean\n private readonly id: number\n private messageBuffer: Buffer = Buffer.alloc(0)\n private idleTimer?: NodeJS.Timeout\n private idleTimeout: number\n private lastActivityTime: number = Date.now()\n\n // Static counter for generating unique handler IDs\n private static nextHandlerId = 1\n\n constructor(options: PGLiteSocketHandlerOptions) {\n super()\n this.queryQueue = options.queryQueue\n this.closeOnDetach = options.closeOnDetach ?? false\n this.inspect = options.inspect ?? false\n this.debug = options.debug ?? false\n this.idleTimeout = options.idleTimeout ?? 0\n this.id = PGLiteSocketHandler.nextHandlerId++\n\n this.log('constructor: created new handler')\n }\n\n public get handlerId(): number {\n return this.id\n }\n\n private log(message: string, ...args: any[]): void {\n if (this.debug) {\n console.log(`[PGLiteSocketHandler#${this.id}] ${message}`, ...args)\n }\n }\n\n public async attach(socket: Socket): Promise<PGLiteSocketHandler> {\n this.log(\n `attach: attaching socket from ${socket.remoteAddress}:${socket.remotePort}`,\n )\n\n if (this.socket) {\n throw new Error('Socket already attached')\n }\n\n this.socket = socket\n this.active = true\n this.lastActivityTime = Date.now()\n\n // Set up socket options\n socket.setNoDelay(true)\n\n // Set up idle timeout if configured\n if (this.idleTimeout > 0) {\n this.resetIdleTimer()\n }\n\n // Setup event handlers\n this.log(`attach: setting up socket event handlers`)\n\n socket.on('data', (data) => {\n this.lastActivityTime = Date.now()\n this.resetIdleTimer()\n\n setImmediate(async () => {\n try {\n await this.handleData(data)\n } catch (err) {\n this.log('socket on data error: ', err)\n this.handleError(err as Error)\n }\n })\n })\n\n socket.on('error', (err) => {\n setImmediate(() => this.handleError(err))\n })\n\n socket.on('close', () => {\n setImmediate(() => this.handleClose())\n })\n\n this.log(`attach: socket handler ready`)\n return this\n }\n\n private resetIdleTimer(): void {\n if (this.idleTimeout <= 0) return\n\n if (this.idleTimer) {\n clearTimeout(this.idleTimer)\n }\n\n this.idleTimer = setTimeout(() => {\n const idleTime = Date.now() - this.lastActivityTime\n this.log(`idle timeout after ${idleTime}ms`)\n this.handleError(new Error('Idle timeout'))\n }, this.idleTimeout)\n }\n\n public async detach(close?: boolean): Promise<PGLiteSocketHandler> {\n this.log(`detach: detaching socket, close=${close ?? this.closeOnDetach}`)\n\n if (this.idleTimer) {\n clearTimeout(this.idleTimer)\n this.idleTimer = undefined\n }\n\n // Clear any pending queries for this handler\n this.queryQueue.clearQueueForHandler(this.id)\n\n await this.queryQueue.clearTransactionIfNeeded(this.id)\n\n if (!this.socket) {\n this.log(`detach: no socket attached, nothing to do`)\n return this\n }\n\n // Remove all listeners\n this.socket.removeAllListeners('data')\n this.socket.removeAllListeners('error')\n this.socket.removeAllListeners('close')\n\n // Close the socket if requested\n if (close ?? this.closeOnDetach) {\n if (this.socket.writable) {\n this.log(`detach: closing socket`)\n try {\n this.socket.end()\n this.socket.destroy()\n } catch (err) {\n this.log(`detach: error closing socket:`, err)\n }\n }\n }\n\n this.socket = null\n this.active = false\n this.messageBuffer = Buffer.alloc(0)\n\n this.log(`detach: handler cleaned up`)\n return this\n }\n\n public get isAttached(): boolean {\n return this.socket !== null\n }\n\n private async handleData(data: Buffer): Promise<number> {\n if (!this.socket || !this.active) {\n this.log(`handleData: no active socket, ignoring data`)\n return 0\n }\n\n this.log(`handleData: received ${data.length} bytes`)\n\n // Append to buffer for message reassembly\n this.messageBuffer = Buffer.concat([this.messageBuffer, data])\n\n // Print the incoming data to the console\n this.inspectData('incoming', data)\n\n try {\n let totalProcessed = 0\n\n while (this.messageBuffer.length > 0) {\n // Determine message length\n let messageLength = 0\n let isComplete = false\n\n // Handle startup message (no type byte, just length)\n if (this.messageBuffer.length >= 4) {\n const firstInt = this.messageBuffer.readInt32BE(0)\n\n if (this.messageBuffer.length >= 8) {\n const secondInt = this.messageBuffer.readInt32BE(4)\n // PostgreSQL 3.0 protocol version\n if (secondInt === 196608 || secondInt === 0x00030000) {\n messageLength = firstInt\n isComplete = this.messageBuffer.length >= messageLength\n }\n }\n\n // Regular message (type byte + length)\n if (!isComplete && this.messageBuffer.length >= 5) {\n const msgLength = this.messageBuffer.readInt32BE(1)\n messageLength = 1 + msgLength\n isComplete = this.messageBuffer.length >= messageLength\n }\n }\n\n if (!isComplete || messageLength === 0) {\n this.log(\n `handleData: incomplete message, buffering ${this.messageBuffer.length} bytes`,\n )\n break\n }\n\n // Extract and process complete message\n const message = this.messageBuffer.slice(0, messageLength)\n this.messageBuffer = this.messageBuffer.slice(messageLength)\n\n this.log(`handleData: processing message of ${message.length} bytes`)\n\n // Check if socket is still active before processing\n if (!this.active || !this.socket) {\n this.log(`handleData: socket no longer active, stopping processing`)\n break\n }\n\n let socketWriteError: any = undefined\n // Queue the query for execution\n // This allows multiple connections to queue queries simultaneously\n await this.queryQueue.enqueue(\n this.id,\n new Uint8Array(message),\n (data) => {\n this.log(`handleData: received ${data.length} bytes from PGlite`)\n\n // Print the outgoing data to the console\n this.inspectData('outgoing', data)\n\n // Send response if available\n if (\n data.length > 0 &&\n this.socket &&\n this.socket.writable &&\n this.active\n ) {\n // await new Promise<number>((resolve, reject) => {\n this.log(`handleData: writing response to socket`)\n if (this.socket?.writable) {\n this.socket.write(Buffer.from(data), (err?: any) => {\n if (err) {\n this.log(`handleData: error writing to socket:`, err)\n socketWriteError = err\n } else {\n this.log(`handleData: socket sent: ${data.length} bytes`)\n }\n })\n } else {\n this.log(`handleData: socket no longer writable`)\n }\n }\n totalProcessed += data.length\n },\n )\n if (socketWriteError) throw socketWriteError\n }\n\n // Emit data event with byte sizes\n this.dispatchEvent(\n new CustomEvent('data', {\n detail: { incoming: data.length, outgoing: totalProcessed },\n }),\n )\n\n return totalProcessed\n } catch (err) {\n this.log(`handleData: error processing data:`, err)\n throw err\n }\n }\n\n private handleError(err: Error): void {\n if (!this.active) {\n this.log(`handleError: handler not active, ignoring error`)\n return\n }\n\n // ECONNRESET is expected behavior when clients disconnect\n if (err.message?.includes('ECONNRESET')) {\n this.log(\n `handleError: client disconnected (ECONNRESET) - normal behavior`,\n )\n } else if (err.message?.includes('Idle timeout')) {\n this.log(`handleError: connection idle timeout`)\n } else {\n this.log(`handleError:`, err)\n }\n\n this.active = false\n\n // Emit error event\n this.dispatchEvent(new CustomEvent('error', { detail: err }))\n\n // Clean up\n this.detach(true)\n }\n\n private handleClose(): void {\n this.log(`handleClose: socket closed`)\n this.active = false\n this.dispatchEvent(new CustomEvent('close'))\n this.detach(false)\n }\n\n private inspectData(\n direction: 'incoming' | 'outgoing',\n data: Buffer | Uint8Array,\n ): void {\n if (!this.inspect) return\n console.log('-'.repeat(75))\n if (direction === 'incoming') {\n console.log('-> incoming', data.length, 'bytes')\n } else {\n console.log('<- outgoing', data.length, 'bytes')\n }\n\n for (let offset = 0; offset < data.length; offset += 16) {\n const chunkSize = Math.min(16, data.length - offset)\n\n let hexPart = ''\n for (let i = 0; i < 16; i++) {\n if (i < chunkSize) {\n const byte = data[offset + i]\n hexPart += byte.toString(16).padStart(2, '0') + ' '\n } else {\n hexPart += ' '\n }\n }\n\n let asciiPart = ''\n for (let i = 0; i < chunkSize; i++) {\n const byte = data[offset + i]\n asciiPart += byte >= 32 && byte <= 126 ? String.fromCharCode(byte) : '.'\n }\n\n console.log(\n `${offset.toString(16).padStart(8, '0')} ${hexPart} ${asciiPart}`,\n )\n }\n }\n}\n\n/**\n * Options for creating a PGLiteSocketServer\n */\nexport interface PGLiteSocketServerOptions {\n /** The PGlite database instance */\n db: PGlite\n /** The port to listen on (default: 5432) */\n port?: number\n /** The host to bind to (default: 127.0.0.1) */\n host?: string\n /** Unix socket path to bind to (default: undefined) */\n path?: string\n /** Print the incoming and outgoing data to the console in hex and ascii */\n inspect?: boolean\n /** Enable debug logging of method calls */\n debug?: boolean\n /** Idle timeout in ms (0 to disable, default: 0) */\n idleTimeout?: number\n /** Maximum concurrent connections (default: 100) */\n maxConnections?: number\n}\n\n/**\n * PGLite Socket Server with support for multiple concurrent connections\n * Connections remain open and queries are queued at the query level\n */\nexport class PGLiteSocketServer extends EventTarget {\n readonly db: PGlite\n private server: Server | null = null\n private port?: number\n private host?: string\n private path?: string\n private active = false\n private inspect: boolean\n private debug: boolean\n private idleTimeout: number\n private maxConnections: number\n private handlers: Set<PGLiteSocketHandler> = new Set()\n private queryQueue: QueryQueueManager\n\n constructor(options: PGLiteSocketServerOptions) {\n super()\n this.db = options.db\n if (options.path) {\n this.path = options.path\n } else {\n if (typeof options.port === 'number') {\n // Keep port undefined on port 0, will be set by the OS when we start the server.\n this.port = options.port ?? options.port\n } else {\n this.port = 5432\n }\n this.host = options.host || '127.0.0.1'\n }\n this.inspect = options.inspect ?? false\n this.debug = options.debug ?? false\n this.idleTimeout = options.idleTimeout ?? 0\n this.maxConnections = options.maxConnections ?? 1\n\n // Create the shared query queue\n this.queryQueue = new QueryQueueManager(this.db, this.debug)\n\n this.log(`constructor: created server on ${this.getServerConn()}`)\n this.log(`constructor: max connections: ${this.maxConnections}`)\n if (this.idleTimeout > 0) {\n this.log(`constructor: idle timeout: ${this.idleTimeout}ms`)\n }\n }\n\n private log(message: string, ...args: any[]): void {\n if (this.debug) {\n console.log(`[PGLiteSocketServer] ${message}`, ...args)\n }\n }\n\n public async start(): Promise<void> {\n this.log(`start: starting server on ${this.getServerConn()}`)\n\n if (this.server) {\n throw new Error('Socket server already started')\n }\n\n // Ensure PGlite is ready before accepting connections\n await this.db.waitReady\n\n this.active = true\n this.server = createServer((socket) => {\n setImmediate(() => this.handleConnection(socket))\n })\n\n this.server.maxConnections = this.maxConnections\n\n return new Promise<void>((resolve, reject) => {\n if (!this.server) return reject(new Error('Server not initialized'))\n\n this.server.on('error', (err) => {\n this.log(`start: server error:`, err)\n this.dispatchEvent(new CustomEvent('error', { detail: err }))\n if (!this.active) {\n reject(err)\n }\n })\n\n if (this.path) {\n this.server.listen(this.path, () => {\n this.log(`start: server listening on ${this.getServerConn()}`)\n this.dispatchEvent(\n new CustomEvent('listening', {\n detail: { path: this.path },\n }),\n )\n resolve()\n })\n } else {\n const server = this.server\n server.listen(this.port, this.host, () => {\n const address = server.address()\n // We are not using pipes, so return type should be AddressInfo\n if (address === null || typeof address !== 'object') {\n throw Error('Expected address info')\n }\n // Assign the new port number\n this.port = address.port\n this.log(`start: server listening on ${this.getServerConn()}`)\n this.dispatchEvent(\n new CustomEvent('listening', {\n detail: { port: this.port, host: this.host },\n }),\n )\n resolve()\n })\n }\n })\n }\n\n public getServerConn(): string {\n if (this.path) return this.path\n return `${this.host}:${this.port}`\n }\n\n public async stop(): Promise<void> {\n this.log(`stop: stopping server`)\n\n this.active = false\n\n // Detach all handlers\n this.log(`stop: detaching ${this.handlers.size} handlers`)\n for (const handler of this.handlers) {\n handler.detach(true)\n }\n this.handlers.clear()\n\n if (!this.server) {\n this.log(`stop: server not running, nothing to do`)\n return Promise.resolve()\n }\n\n return new Promise<void>((resolve) => {\n if (!this.server) return resolve()\n\n this.server.close(() => {\n this.log(`stop: server closed`)\n this.server = null\n this.dispatchEvent(new CustomEvent('close'))\n resolve()\n })\n })\n }\n\n private async handleConnection(socket: Socket): Promise<void> {\n const clientInfo = {\n clientAddress: socket.remoteAddress || 'unknown',\n clientPort: socket.remotePort || 0,\n }\n\n this.log(\n `handleConnection: new connection from ${clientInfo.clientAddress}:${clientInfo.clientPort}`,\n )\n this.log(\n `handleConnection: active connections: ${this.handlers.size}, queued queries: ${this.queryQueue.getQueueLength()}`,\n )\n\n if (!this.active) {\n this.log(`handleConnection: server not active, closing connection`)\n try {\n socket.end()\n } catch (err) {\n this.log(`handleConnection: error closing socket:`, err)\n }\n return\n }\n\n // Check connection limit\n if (this.handlers.size >= this.maxConnections) {\n this.log(`handleConnection: max connections reached, rejecting`)\n socket.write(Buffer.from('Too many connections\\n'))\n socket.end()\n return\n }\n\n // Create a new handler for this connection\n const handler = new PGLiteSocketHandler({\n queryQueue: this.queryQueue,\n closeOnDetach: true,\n inspect: this.inspect,\n debug: this.debug,\n idleTimeout: this.idleTimeout,\n })\n\n // Track this handler\n this.handlers.add(handler)\n\n // Handle errors\n handler.addEventListener('error', (event) 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