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* Database Connection Manager for Coherent.js
*
* @fileoverview Manages database connections, connection pooling, and adapter selection
* with support for multiple database engines and automatic failover.
*/
import { EventEmitter } from 'events';
/**
* Database Connection Manager
*
* @class DatabaseManager
* @extends EventEmitter
* @description Manages database connections with pooling, health checks, and adapter abstraction.
* Provides a unified interface for different database engines.
*
* @param {Object} config - Database configuration
* @param {string} config.type - Database type ('postgresql', 'mysql', 'sqlite', 'mongodb')
* @param {string} [config.host='localhost'] - Database host
* @param {number} [config.port] - Database port (auto-detected by type)
* @param {string} config.database - Database name
* @param {string} [config.username] - Database username
* @param {string} [config.password] - Database password
* @param {Object} [config.pool] - Connection pool configuration
* @param {boolean} [config.debug=false] - Enable debug logging
*
* @example
* const db = new DatabaseManager({
* type: 'postgresql',
* host: 'localhost',
* database: 'myapp',
* username: 'user',
* password: 'pass',
* pool: { min: 2, max: 10 }
* });
*
* await db.connect();
* const users = await db.query('SELECT * FROM users WHERE active = ?', [true]);
*/
export class DatabaseManager extends EventEmitter {
constructor(config) {
super();
this.config = this.validateConfig(config);
this.adapter = null;
this.pool = null;
this.isConnected = false;
this.connectionAttempts = 0;
this.maxRetries = 3;
// Health check interval
this.healthCheckInterval = null;
this.healthCheckFrequency = 30000; // 30 seconds
// Connection statistics
this.stats = {
totalConnections: 0,
activeConnections: 0,
failedConnections: 0,
queriesExecuted: 0,
averageQueryTime: 0,
lastHealthCheck: null
};
}
/**
* Validate database configuration
*
* @private
* @param {Object} config - Configuration to validate
* @returns {Object} Validated configuration
* @throws {Error} If configuration is invalid
*/
validateConfig(config) {
if (!config || typeof config !== 'object') {
throw new Error('Database configuration is required');
}
// New adapter-based configuration
if (config.adapter) {
if (typeof config.adapter !== 'object' ||
typeof config.adapter.createPool !== 'function') {
throw new Error('Invalid adapter provided. Adapter must be an object with a createPool method');
}
// Set default store config if not provided
if (!config.store) {
config.store = { name: 'default' };
} else if (typeof config.store === 'string') {
config.store = { name: config.store };
}
return config;
}
// Legacy type-based configuration
const { type, database } = config;
if (!type) {
throw new Error('Either database type or adapter is required');
}
const supportedTypes = ['postgresql', 'mysql', 'sqlite', 'mongodb'];
if (!supportedTypes.includes(type)) {
throw new Error(`Unsupported database type: ${type}. Supported types: ${supportedTypes.join(', ')}`);
}
if (!database) {
throw new Error('Database name is required for type-based configuration');
}
// Set default ports based on database type
const defaultPorts = {
postgresql: 5432,
mysql: 3306,
mongodb: 27017,
sqlite: null
};
return {
host: config.host || 'localhost',
port: config.port || defaultPorts[type],
...config,
pool: {
min: 2,
max: 10,
acquireTimeoutMillis: 30000,
createTimeoutMillis: 30000,
destroyTimeoutMillis: 5000,
idleTimeoutMillis: 30000,
reapIntervalMillis: 1000,
createRetryIntervalMillis: 200,
...config.pool
}
};
}
/**
* Connect to the database
*
* @returns {Promise<void>}
* @throws {Error} If connection fails after retries
*
* @example
* await db.connect();
* console.log('Database connected successfully');
*/
async connect() {
if (this.isConnected) {
return;
}
try {
// Load appropriate adapter
this.adapter = await this.loadAdapter(this.config.type);
// Create connection pool
this.pool = await this.adapter.createPool(this.config);
// Test connection
await this.testConnection();
this.isConnected = true;
this.connectionAttempts = 0;
// Start health checks if supported by the adapter
if (this.adapter.startHealthChecks) {
this.startHealthChecks();
}
return this;
} catch (error) {
this.connectionAttempts++;
this.stats.failedConnections++;
this.emit('error', error);
if (this.connectionAttempts < this.maxRetries) {
console.warn(`Connection attempt ${this.connectionAttempts} failed. Retrying in 2 seconds...`);
await new Promise(resolve => setTimeout(resolve, 2000));
return this.connect();
}
throw new Error(`Failed to connect to database after ${this.connectionAttempts} attempts: ${error.message}`);
}
}
/**
* Load database adapter
*
* @private
* @param {string} type - Database type
* @returns {Object} Database adapter
*/
loadAdapter(type) {
// If using direct adapter instance (for custom adapters like MemoryAdapter)
if (this.config.adapter) {
return this.config.adapter;
}
// For built-in adapters
const adapterMap = {
postgresql: './adapters/postgresql.js',
mysql: './adapters/mysql.js',
sqlite: './adapters/sqlite.js',
mongodb: './adapters/mongodb.js',
memory: './adapters/memory.js'
};
const adapterPath = adapterMap[type];
if (!adapterPath) {
throw new Error(`No adapter found for database type: ${type}`);
}
// Use dynamic import for ESM compatibility
return import(adapterPath)
.then(adapterModule => {
// Try both the default export and the named export pattern
if (adapterModule.default) {
return new adapterModule.default();
}
const AdapterClass = adapterModule[`${type.charAt(0).toUpperCase() + type.slice(1)}Adapter`];
if (AdapterClass) {
return new AdapterClass();
}
throw new Error(`No valid adapter found in ${adapterPath}`);
})
.catch(error => {
throw new Error(`Failed to load ${type} adapter: ${error.message}`);
});
}
/**
* Test database connection
*
* @private
* @returns {Promise<void>}
*/
async testConnection() {
const startTime = Date.now();
try {
if (typeof this.adapter.testConnection === 'function') {
await this.adapter.testConnection();
} else if (this.adapter.ping) {
// Try ping if available
await this.adapter.ping();
}
// If no test method is available, we'll assume the connection is good
const duration = Date.now() - startTime;
this.stats.lastHealthCheck = new Date();
this.emit('connect:test', { duration });
} catch (error) {
this.emit('error', error);
throw new Error(`Database connection test failed: ${error.message}`);
}
}
/**
* Execute a database query
*
* @param {string} sql - SQL query string
* @param {Array} [params=[]] - Query parameters
* @param {Object} [options={}] - Query options
* @returns {Promise<Object>} Query result
*
* @example
* const users = await db.query('SELECT * FROM users WHERE age > ?', [18]);
* const user = await db.query('SELECT * FROM users WHERE id = ?', [123], { single: true });
*/
async query(operation, params = {}) {
if (!this.isConnected) {
throw new Error('Database not connected. Call connect() first.');
}
const startTime = Date.now();
try {
let result;
// Handle MemoryAdapter's query method
if (typeof this.pool.query === 'function') {
result = await this.pool.query(operation, params);
}
// Handle SQL adapters
else if (typeof this.adapter.query === 'function') {
result = await this.adapter.query(this.pool, operation, params);
} else {
throw new Error('No valid query method found on adapter or pool');
}
// Update statistics
const duration = Date.now() - startTime;
this.stats.queriesExecuted++;
this.stats.averageQueryTime = (
(this.stats.averageQueryTime * (this.stats.queriesExecuted - 1) + duration) /
this.stats.queriesExecuted
);
if (this.config.debug) {
console.log(`Query executed in ${duration}ms: ${operation}`, params);
}
this.emit('query', { operation, params, duration });
return result;
} catch (error) {
const duration = Date.now() - startTime;
this.emit('queryError', { operation, params, duration, error: error.message });
throw new Error(`Query failed: ${error.message}`);
}
}
/**
* Start a database transaction
*
* @returns {Promise<Object>} Transaction object
*
* @example
* const tx = await db.transaction();
* try {
* await tx.query('INSERT INTO users (name) VALUES (?)', ['John']);
* await tx.query('INSERT INTO profiles (user_id) VALUES (?)', [userId]);
* await tx.commit();
* } catch (error) {
* await tx.rollback();
* throw error;
* }
*/
async transaction() {
if (!this.isConnected) {
throw new Error('Database not connected. Call connect() first.');
}
return await this.adapter.transaction(this.pool);
}
/**
* Start health check monitoring
*
* @private
*/
startHealthCheck() {
if (this.healthCheckInterval) {
return;
}
this.healthCheckInterval = setInterval(async () => {
try {
await this.testConnection();
this.emit('healthCheck', { status: 'healthy', timestamp: new Date() });
} catch (error) {
this.emit('healthCheck', { status: 'unhealthy', error: error.message, timestamp: new Date() });
if (this.config.debug) {
console.error('Database health check failed:', error.message);
}
}
}, this.healthCheckFrequency);
}
/**
* Get connection statistics
*
* @returns {Object} Connection statistics
*/
getStats() {
return {
...this.stats,
isConnected: this.isConnected,
poolStats: this.pool ? this.adapter.getPoolStats(this.pool) : null
};
}
/**
* Close database connection
*
* @returns {Promise<void>}
*/
async close() {
if (!this.isConnected) {
return;
}
// Stop health checks
if (this.healthCheckInterval) {
clearInterval(this.healthCheckInterval);
this.healthCheckInterval = null;
}
// Close connection pool
if (this.pool && this.adapter) {
await this.adapter.closePool(this.pool);
}
this.isConnected = false;
this.pool = null;
this.adapter = null;
this.emit('disconnected');
if (this.config.debug) {
console.log('Database connection closed');
}
}
}
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