@electric-sql/pglite-socket/dist/index.cjs.map

A socket implementation for PGlite enabling remote connections

{"version":3,"sources":["../src/index.ts"],"sourcesContent":["import type { PGlite } from '@electric-sql/pglite'\nimport { createServer, Server, Socket } from 'net'\n\n// Connection queue timeout in milliseconds\nexport const CONNECTION_QUEUE_TIMEOUT = 60000 // 60 seconds\n\n/**\n * Options for creating a PGLiteSocketHandler\n */\nexport interface PGLiteSocketHandlerOptions {\n  /** The PGlite database instance */\n  db: PGlite\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}\n\n/**\n * Low-level handler for a single socket connection to PGLite\n * Handles the raw protocol communication between a socket and PGLite\n */\nexport class PGLiteSocketHandler extends EventTarget {\n  readonly db: PGlite\n  private socket: Socket | null = null\n  private active = false\n  private closeOnDetach: boolean\n  private resolveLock?: () => void\n  private rejectLock?: (err: Error) => void\n  private inspect: boolean\n  private debug: boolean\n  private readonly id: number\n\n  // Static counter for generating unique handler IDs\n  private static nextHandlerId = 1\n\n  /**\n   * Create a new PGLiteSocketHandler\n   * @param options Options for the handler\n   */\n  constructor(options: PGLiteSocketHandlerOptions) {\n    super()\n    this.db = options.db\n    this.closeOnDetach = options.closeOnDetach ?? false\n    this.inspect = options.inspect ?? false\n    this.debug = options.debug ?? false\n    this.id = PGLiteSocketHandler.nextHandlerId++\n\n    this.log('constructor: created new handler')\n  }\n\n  /**\n   * Get the unique ID of this handler\n   */\n  public get handlerId(): number {\n    return this.id\n  }\n\n  /**\n   * Log a message if debug is enabled\n   * @private\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  /**\n   * Attach a socket to this handler\n   * @param socket The socket to attach\n   * @returns this handler instance\n   * @throws Error if a socket is already attached\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\n    // Ensure the PGlite instance is ready\n    this.log(`attach: waiting for PGlite to be ready`)\n    await this.db.waitReady\n\n    // Hold the lock on the PGlite instance\n    this.log(`attach: acquiring exclusive lock on PGlite instance`)\n    await new Promise<void>((resolve) => {\n      this.db.runExclusive(() => {\n        // Ensure we have the lock on the PGlite instance\n        resolve()\n\n        // Use a promise to hold the lock on the PGlite instance\n        // this can be resolved or rejected by the handler to release the lock\n        return new Promise<void>((resolveLock, rejectLock) => {\n          this.resolveLock = resolveLock\n          this.rejectLock = rejectLock\n        })\n      })\n    })\n\n    // Setup event handlers\n    this.log(`attach: setting up socket event handlers`)\n    socket.on('data', async (data) => {\n      try {\n        const result = await this.handleData(data)\n        this.log(`socket on data sent: ${result} bytes`)\n      } catch (err) {\n        this.log('socket on data error: ', err)\n      }\n    })\n    socket.on('error', (err) => this.handleError(err))\n    socket.on('close', () => this.handleClose())\n\n    return this\n  }\n\n  /**\n   * Detach the current socket from this handler\n   * @param close Whether to close the socket when detaching (overrides constructor option)\n   * @returns this handler instance\n   */\n  public detach(close?: boolean): PGLiteSocketHandler {\n    this.log(`detach: detaching socket, close=${close ?? this.closeOnDetach}`)\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        this.socket.end()\n        this.socket.destroy()\n      }\n    }\n\n    // Release the lock on the PGlite instance\n    this.log(`detach: releasing exclusive lock on PGlite instance`)\n    this.resolveLock?.()\n\n    this.socket = null\n    this.active = false\n    return this\n  }\n\n  /**\n   * Check if a socket is currently attached\n   */\n  public get isAttached(): boolean {\n    return this.socket !== null\n  }\n\n  /**\n   * Handle incoming data from the socket\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 new Promise((_, reject) => reject(`no active socket`))\n    }\n\n    this.log(`handleData: received ${data.length} bytes`)\n\n    // Print the incoming data to the console\n    this.inspectData('incoming', data)\n\n    try {\n      // Process the raw protocol data\n      this.log(`handleData: sending data to PGlite for processing`)\n      const result = await this.db.execProtocolRaw(new Uint8Array(data))\n\n      this.log(`handleData: received ${result.length} bytes from PGlite`)\n\n      // Print the outgoing data to the console\n      this.inspectData('outgoing', result)\n\n      // Send the result back if the socket is still connected\n      if (this.socket && this.socket.writable && this.active) {\n        if (result.length <= 0) {\n          this.log(`handleData: cowardly refusing to send empty packet`)\n          return new Promise((_, reject) => reject('no data'))\n        }\n\n        const promise = new Promise<number>((resolve, reject) => {\n          this.log(`handleData: writing response to socket`)\n          if (this.socket) {\n            this.socket.write(Buffer.from(result), (err?: Error) => {\n              if (err) {\n                reject(`Error while writing to the socket ${err.toString()}`)\n              } else {\n                resolve(result.length)\n              }\n            })\n          } else {\n            reject(`No socket`)\n          }\n        })\n\n        // Emit data event with byte sizes\n        this.dispatchEvent(\n          new CustomEvent('data', {\n            detail: { incoming: data.length, outgoing: result.length },\n          }),\n        )\n        return promise\n      } else {\n        this.log(\n          `handleData: socket no longer writable or active, discarding response`,\n        )\n        return new Promise((_, reject) =>\n          reject(`No socket, not active or not writeable`),\n        )\n      }\n    } catch (err) {\n      this.log(`handleData: error processing data:`, err)\n      this.handleError(err as Error)\n      return new Promise((_, reject) =>\n        reject(`Error while processing data ${(err as Error).toString()}`),\n      )\n    }\n  }\n\n  /**\n   * Handle errors from the socket\n   */\n  private handleError(err: Error): void {\n    this.log(`handleError:`, err)\n\n    // Emit error event\n    this.dispatchEvent(new CustomEvent('error', { detail: err }))\n\n    // Reject the lock on the PGlite instance\n    this.log(`handleError: rejecting exclusive lock on PGlite instance`)\n    this.rejectLock?.(err)\n    this.resolveLock = undefined\n    this.rejectLock = undefined\n\n    // Close the connection on error\n    this.detach(true)\n  }\n\n  /**\n   * Handle socket close event\n   */\n  private handleClose(): void {\n    this.log(`handleClose: socket closed`)\n\n    this.dispatchEvent(new CustomEvent('close'))\n    this.detach(false) // Already closed, just clean up\n  }\n\n  /**\n   * Print data in hex and ascii to the console\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    // Process 16 bytes per line\n    for (let offset = 0; offset < data.length; offset += 16) {\n      // Calculate current chunk size (may be less than 16 for the last chunk)\n      const chunkSize = Math.min(16, data.length - offset)\n\n      // Build the hex representation\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 += '   ' // 3 spaces for missing bytes\n        }\n      }\n\n      // Build the ASCII representation\n      let asciiPart = ''\n      for (let i = 0; i < chunkSize; i++) {\n        const byte = data[offset + i]\n        // Use printable characters (32-126), replace others with a dot\n        asciiPart += byte >= 32 && byte <= 126 ? String.fromCharCode(byte) : '.'\n      }\n\n      // Print the line with offset in hex, hex values, and ASCII representation\n      console.log(\n        `${offset.toString(16).padStart(8, '0')}  ${hexPart} ${asciiPart}`,\n      )\n    }\n  }\n}\n\n/**\n * Represents a queued connection with timeout\n */\ninterface QueuedConnection {\n  socket: Socket\n  clientInfo: {\n    clientAddress: string\n    clientPort: number\n  }\n  timeoutId: NodeJS.Timeout\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). If specified, takes precedence over host:port */\n  path?: string\n  /** Print the incoming and outgoing data to the console in hex and ascii */\n  inspect?: boolean\n  /** Connection queue timeout in milliseconds (default: 10000) */\n  connectionQueueTimeout?: number\n  /** Enable debug logging of method calls */\n  debug?: boolean\n}\n\n/**\n * High-level server that manages socket connections to PGLite\n * Creates and manages a TCP server and handles client connections\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 connectionQueueTimeout: number\n  private activeHandler: PGLiteSocketHandler | null = null\n  private connectionQueue: QueuedConnection[] = []\n  private handlerCount: number = 0\n\n  /**\n   * Create a new PGLiteSocketServer\n   * @param options Options for the server\n   */\n  constructor(options: PGLiteSocketServerOptions) {\n    super()\n    this.db = options.db\n    if (options.path) {\n      this.path = options.path\n    } else {\n      this.port = options.port || 5432\n      this.host = options.host || '127.0.0.1'\n    }\n    this.inspect = options.inspect ?? false\n    this.debug = options.debug ?? false\n    this.connectionQueueTimeout =\n      options.connectionQueueTimeout ?? CONNECTION_QUEUE_TIMEOUT\n\n    this.log(`constructor: created server on ${this.host}:${this.port}`)\n    this.log(\n      `constructor: connection queue timeout: ${this.connectionQueueTimeout}ms`,\n    )\n  }\n\n  /**\n   * Log a message if debug is enabled\n   * @private\n   */\n  private log(message: string, ...args: any[]): void {\n    if (this.debug) {\n      console.log(`[PGLiteSocketServer] ${message}`, ...args)\n    }\n  }\n\n  /**\n   * Start the socket server\n   * @returns Promise that resolves when the server is listening\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    this.active = true\n    this.server = createServer((socket) => this.handleConnection(socket))\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        reject(err)\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        this.server.listen(this.port, this.host, () => {\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}:${this.port}`\n  }\n\n  /**\n   * Stop the socket server\n   * @returns Promise that resolves when the server is closed\n   */\n  public async stop(): Promise<void> {\n    this.log(`stop: stopping server`)\n\n    this.active = false\n\n    // Clear connection queue\n    this.log(\n      `stop: clearing connection queue (${this.connectionQueue.length} connections)`,\n    )\n\n    this.connectionQueue.forEach((queuedConn) => {\n      clearTimeout(queuedConn.timeoutId)\n      if (queuedConn.socket.writable) {\n        this.log(\n          `stop: closing queued connection from ${queuedConn.clientInfo.clientAddress}:${queuedConn.clientInfo.clientPort}`,\n        )\n        queuedConn.socket.end()\n      }\n    })\n    this.connectionQueue = []\n\n    // Detach active handler if exists\n    if (this.activeHandler) {\n      this.log(`stop: detaching active handler #${this.activeHandlerId}`)\n      this.activeHandler.detach(true)\n      this.activeHandler = null\n    }\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  /**\n   * Get the active handler ID, or null if no active handler\n   */\n  private get activeHandlerId(): number | null {\n    return this.activeHandler?.handlerId ?? null\n  }\n\n  /**\n   * Handle a new client connection\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\n    // If server is not active, close the connection immediately\n    if (!this.active) {\n      this.log(`handleConnection: server not active, closing connection`)\n      socket.end()\n      return\n    }\n\n    // If we don't have an active handler or it's not attached, we can use this connection immediately\n    if (!this.activeHandler || !this.activeHandler.isAttached) {\n      this.log(`handleConnection: no active handler, attaching socket directly`)\n      this.dispatchEvent(new CustomEvent('connection', { detail: clientInfo }))\n      await this.attachSocketToNewHandler(socket, clientInfo)\n      return\n    }\n\n    // Otherwise, queue the connection\n    this.log(\n      `handleConnection: active handler #${this.activeHandlerId} exists, queueing connection`,\n    )\n    this.enqueueConnection(socket, clientInfo)\n  }\n\n  /**\n   * Add a connection to the queue\n   */\n  private enqueueConnection(\n    socket: Socket,\n    clientInfo: { clientAddress: string; clientPort: number },\n  ): void {\n    this.log(\n      `enqueueConnection: queueing connection from ${clientInfo.clientAddress}:${clientInfo.clientPort}, timeout: ${this.connectionQueueTimeout}ms`,\n    )\n\n    // Set a timeout for this queued connection\n    const timeoutId = setTimeout(() => {\n      this.log(\n        `enqueueConnection: timeout for connection from ${clientInfo.clientAddress}:${clientInfo.clientPort}`,\n      )\n\n      // Remove from queue\n      this.connectionQueue = this.connectionQueue.filter(\n        (queuedConn) => queuedConn.socket !== socket,\n      )\n\n      // End the connection if it's still open\n      if (socket.writable) {\n        this.log(`enqueueConnection: closing timed out connection`)\n        socket.end()\n      }\n\n      this.dispatchEvent(\n        new CustomEvent('queueTimeout', {\n          detail: { ...clientInfo, queueSize: this.connectionQueue.length },\n        }),\n      )\n    }, this.connectionQueueTimeout)\n\n    // Add to queue\n    this.connectionQueue.push({ socket, clientInfo, timeoutId })\n\n    this.log(\n      `enqueueConnection: connection queued, queue size: ${this.connectionQueue.length}`,\n    )\n\n    this.dispatchEvent(\n      new CustomEvent('queuedConnection', {\n        detail: { ...clientInfo, queueSize: this.connectionQueue.length },\n      }),\n    )\n  }\n\n  /**\n   * Process the next connection in the queue\n   */\n  private processNextInQueue(): void {\n    this.log(\n      `processNextInQueue: processing next connection, queue size: ${this.connectionQueue.length}`,\n    )\n\n    // No connections in queue or server not active\n    if (this.connectionQueue.length === 0 || !this.active) {\n      this.log(\n        `processNextInQueue: no connections in queue or server not active, nothing to do`,\n      )\n      return\n    }\n\n    // Get the next connection\n    const nextConn = this.connectionQueue.shift()\n    if (!nextConn) return\n\n    this.log(\n      `processNextInQueue: processing connection from ${nextConn.clientInfo.clientAddress}:${nextConn.clientInfo.clientPort}`,\n    )\n\n    // Clear the timeout\n    clearTimeout(nextConn.timeoutId)\n\n    // Check if the socket is still valid\n    if (!nextConn.socket.writable) {\n      this.log(\n        `processNextInQueue: socket no longer writable, skipping to next connection`,\n      )\n      // Socket closed while waiting, process next in queue\n      this.processNextInQueue()\n      return\n    }\n\n    // Attach this socket to a new handler\n    this.attachSocketToNewHandler(nextConn.socket, nextConn.clientInfo).catch(\n      (err) => {\n        this.log(`processNextInQueue: error attaching socket:`, err)\n        this.dispatchEvent(new CustomEvent('error', { detail: err }))\n        // Try the next connection\n        this.processNextInQueue()\n      },\n    )\n  }\n\n  /**\n   * Attach a socket to a new handler\n   */\n  private async attachSocketToNewHandler(\n    socket: Socket,\n    clientInfo: { clientAddress: string; clientPort: number },\n  ): Promise<void> {\n    this.handlerCount++\n\n    this.log(\n      `attachSocketToNewHandler: creating new handler for ${clientInfo.clientAddress}:${clientInfo.clientPort} (handler #${this.handlerCount})`,\n    )\n\n    // Create a new handler for this connection\n    const handler = new PGLiteSocketHandler({\n      db: this.db,\n      closeOnDetach: true,\n      inspect: this.inspect,\n      debug: this.debug,\n    })\n\n    // Forward error events from the handler\n    handler.addEventListener('error', (event) => {\n      this.log(\n        `handler #${handler.handlerId}: error from handler:`,\n        (event as CustomEvent<Error>).detail,\n      )\n      this.dispatchEvent(\n        new CustomEvent('error', {\n          detail: (event as CustomEvent<Error>).detail,\n        }),\n      )\n    })\n\n    // Handle close event to process next queued connection\n    handler.addEventListener('close', () => {\n      this.log(`handler #${handler.handlerId}: closed`)\n\n      // If this is our active handler, clear it\n      if (this.activeHandler === handler) {\n        this.log(\n          `handler #${handler.handlerId}: was active handler, processing next connection in queue`,\n        )\n        this.activeHandler = null\n        // Process next connection in queue\n        this.processNextInQueue()\n      }\n    })\n\n    try {\n      // Set as active handler\n      this.activeHandler = handler\n\n      this.log(`handler #${handler.handlerId}: attaching socket`)\n\n      // Attach the socket to the handler\n      await handler.attach(socket)\n\n      this.dispatchEvent(new CustomEvent('connection', { detail: clientInfo }))\n    } catch (err) {\n      // If there was an error attaching, clean up\n      this.log(`handler #${handler.handlerId}: error attaching socket:`, err)\n      this.activeHandler = null\n      if (socket.writable) {\n        socket.end()\n      }\n      throw err\n    }\n  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