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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 | /** * MongoDB Database Adapter for Coherent.js * * @fileoverview MongoDB adapter implementation with connection pooling and document operations. */ /** * Create a new MongoDB adapter instance * * @returns {Object} MongoDB adapter instance with database operations */ export function createMongoDBAdapter() { let mongodb = null; let client = null; let db = null; /** * Initialize MongoDB module * * @private * @returns {Promise<void>} */ async function initializeMongoDB() { if (!mongodb) { try { const mongoModule = await import('mongodb'); mongodb = mongoModule; } catch { throw new Error('Failed to load mongodb module. Make sure to install it: npm install mongodb'); } } } /** * Connect to the database * * @param {Object} config - Database configuration * @param {string} config.url - MongoDB connection URL * @param {string} config.database - Database name * @param {Object} [config.options] - MongoDB client options * @returns {Promise<Object>} The database adapter instance */ async function connect(config) { await initializeMongoDB(); try { client = new mongodb.MongoClient(config.url, config.options || {}); await client.connect(); db = client.db(config.database); return instance; } catch (error) { throw new Error(`Failed to connect to MongoDB: ${error.message}`); } } /** * Execute a query on a collection * * @param {string} collectionName - Name of the collection * @param {Object} query - Query object * @param {Object} [options] - Query options * @returns {Promise<Array<Object>>} Query results */ async function query(collectionName, query = {}, options = {}) { if (!db) { throw new Error('Database connection not established. Call connect() first.'); } try { const collection = db.collection(collectionName); const cursor = collection.find(query, options); if (options.sort) { cursor.sort(options.sort); } if (options.limit) { cursor.limit(options.limit); } if (options.skip) { cursor.skip(options.skip); } if (options.projection) { cursor.project(options.projection); } return cursor.toArray(); } catch (error) { throw new Error(`MongoDB query error: ${error.message}`); } } /** * Execute a database command * * @param {Object} command - Database command * @returns {Promise<Object>} Command result */ async function execute(command) { if (!db) { throw new Error('Database connection not established. Call connect() first.'); } try { return await db.command(command); } catch (error) { throw new Error(`MongoDB command error: ${error.message}`); } } /** * Begin a transaction * * @returns {Promise<Object>} Session object for the transaction */ async function beginTransaction() { if (!client) { throw new Error('Database connection not established. Call connect() first.'); } const session = client.startSession(); session.startTransaction(); return session; } /** * Commit a transaction * * @param {Object} session - The session object from beginTransaction * @returns {Promise<void>} */ async function commit(session) { if (!session) { throw new Error('No active transaction session'); } try { await session.commitTransaction(); } finally { await session.endSession(); } } /** * Rollback a transaction * * @param {Object} session - The session object from beginTransaction * @returns {Promise<void>} */ async function rollback(session) { if (!session) { throw new Error('No active transaction session'); } try { await session.abortTransaction(); } finally { await session.endSession(); } } /** * Disconnect from the database * * @returns {Promise<void>} */ async function disconnect() { if (client) { await client.close(); client = null; db = null; } } /** * Get the underlying database connection * * @returns {Object} The database connection */ function getConnection() { if (!db) { throw new Error('Database connection not established. Call connect() first.'); } return db; } /** * Ping the database to check if connection is alive * * @returns {Promise<boolean>} True if connection is alive */ async function ping() { try { await db.command({ ping: 1 }); return true; } catch { return false; } } /** * Escape a value for MongoDB queries * * @param {*} value - Value to escape * @returns {*} Escaped value */ function escape(value) { // MongoDB driver handles escaping internally return value; } // Public API const instance = { connect, query, execute, beginTransaction, commit, rollback, disconnect, getConnection, ping, escape, // Alias for backward compatibility run: execute }; return instance; } // For backward compatibility export const MongoDBAdapter = { create: createMongoDBAdapter }; |