/** * SMTP Client Connection Manager * Connection pooling and lifecycle management */ import * as net from 'node:net'; import * as tls from 'node:tls'; import { EventEmitter } from 'node:events'; import { DEFAULTS, CONNECTION_STATES } from './constants.js'; import { logConnection, logDebug } from './utils/logging.js'; import { generateConnectionId } from './utils/helpers.js'; export class ConnectionManager extends EventEmitter { options; connections = new Map(); pendingConnections = new Set(); idleTimeout = null; constructor(options) { super(); this.options = options; this.setupIdleCleanup(); } /** * Get or create a connection */ async getConnection() { // Try to reuse an idle connection if pooling is enabled if (this.options.pool) { const idleConnection = this.findIdleConnection(); if (idleConnection) { const connectionId = this.getConnectionId(idleConnection) || 'unknown'; logDebug('Reusing idle connection', this.options, { connectionId }); return idleConnection; } // Check if we can create a new connection if (this.getActiveConnectionCount() >= (this.options.maxConnections || DEFAULTS.MAX_CONNECTIONS)) { throw new Error('Maximum number of connections reached'); } } return this.createConnection(); } /** * Create a new connection */ async createConnection() { const connectionId = generateConnectionId(); try { this.pendingConnections.add(connectionId); logConnection('connecting', this.options, { connectionId }); const socket = await this.establishSocket(); const connection = { socket, state: CONNECTION_STATES.CONNECTED, options: this.options, secure: this.options.secure || false, createdAt: new Date(), lastActivity: new Date(), messageCount: 0 }; this.setupSocketHandlers(socket, connectionId); this.connections.set(connectionId, connection); this.pendingConnections.delete(connectionId); logConnection('connected', this.options, { connectionId }); this.emit('connection', connection); return connection; } catch (error) { this.pendingConnections.delete(connectionId); logConnection('error', this.options, { connectionId, error }); throw error; } } /** * Release a connection back to the pool or close it */ releaseConnection(connection) { const connectionId = this.getConnectionId(connection); if (!connectionId || !this.connections.has(connectionId)) { return; } if (this.options.pool && this.shouldReuseConnection(connection)) { // Return to pool connection.state = CONNECTION_STATES.READY; connection.lastActivity = new Date(); logDebug('Connection returned to pool', this.options, { connectionId }); } else { // Close connection this.closeConnection(connection); } } /** * Close a specific connection */ closeConnection(connection) { const connectionId = this.getConnectionId(connection); if (connectionId) { this.connections.delete(connectionId); } connection.state = CONNECTION_STATES.CLOSING; try { if (!connection.socket.destroyed) { connection.socket.destroy(); } } catch (error) { logDebug('Error closing connection', this.options, { error }); } logConnection('disconnected', this.options, { connectionId }); this.emit('disconnect', connection); } /** * Close all connections */ closeAllConnections() { logDebug('Closing all connections', this.options); for (const connection of this.connections.values()) { this.closeConnection(connection); } this.connections.clear(); this.pendingConnections.clear(); if (this.idleTimeout) { clearInterval(this.idleTimeout); this.idleTimeout = null; } } /** * Get connection pool status */ getPoolStatus() { const total = this.connections.size; const active = Array.from(this.connections.values()) .filter(conn => conn.state === CONNECTION_STATES.BUSY).length; const idle = total - active; const pending = this.pendingConnections.size; return { total, active, idle, pending }; } /** * Update connection activity timestamp */ updateActivity(connection) { connection.lastActivity = new Date(); } async establishSocket() { return new Promise((resolve, reject) => { const timeout = this.options.connectionTimeout || DEFAULTS.CONNECTION_TIMEOUT; let socket; if (this.options.secure) { // Direct TLS connection socket = tls.connect({ host: this.options.host, port: this.options.port, ...this.options.tls }); } else { // Plain connection socket = new net.Socket(); socket.connect(this.options.port, this.options.host); } const timeoutHandler = setTimeout(() => { socket.destroy(); reject(new Error(`Connection timeout after ${timeout}ms`)); }, timeout); // For TLS connections, we need to wait for 'secureConnect' instead of 'connect' const successEvent = this.options.secure ? 'secureConnect' : 'connect'; socket.once(successEvent, () => { clearTimeout(timeoutHandler); resolve(socket); }); socket.once('error', (error) => { clearTimeout(timeoutHandler); reject(error); }); }); } setupSocketHandlers(socket, connectionId) { const socketTimeout = this.options.socketTimeout || DEFAULTS.SOCKET_TIMEOUT; socket.setTimeout(socketTimeout); socket.on('timeout', () => { logDebug('Socket timeout', this.options, { connectionId }); socket.destroy(); }); socket.on('error', (error) => { logConnection('error', this.options, { connectionId, error }); this.connections.delete(connectionId); }); socket.on('close', () => { this.connections.delete(connectionId); logDebug('Socket closed', this.options, { connectionId }); }); } findIdleConnection() { for (const connection of this.connections.values()) { if (connection.state === CONNECTION_STATES.READY) { return connection; } } return null; } shouldReuseConnection(connection) { const maxMessages = this.options.maxMessages || DEFAULTS.MAX_MESSAGES; const maxAge = 300000; // 5 minutes const age = Date.now() - connection.createdAt.getTime(); return connection.messageCount < maxMessages && age < maxAge && !connection.socket.destroyed; } getActiveConnectionCount() { return this.connections.size + this.pendingConnections.size; } getConnectionId(connection) { for (const [id, conn] of this.connections.entries()) { if (conn === connection) { return id; } } return null; } setupIdleCleanup() { if (!this.options.pool) { return; } const cleanupInterval = DEFAULTS.POOL_IDLE_TIMEOUT; this.idleTimeout = setInterval(() => { const now = Date.now(); const connectionsToClose = []; for (const connection of this.connections.values()) { const idleTime = now - connection.lastActivity.getTime(); if (connection.state === CONNECTION_STATES.READY && idleTime > cleanupInterval) { connectionsToClose.push(connection); } } for (const connection of connectionsToClose) { logDebug('Closing idle connection', this.options); this.closeConnection(connection); } }, cleanupInterval); } } //# 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