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* 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() {
Eif (!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 = {}) {
Iif (!db) {
throw new Error('Database connection not established. Call connect() first.');
}
try {
const collection = db.collection(collectionName);
const cursor = collection.find(query, options);
Iif (options.sort) {
cursor.sort(options.sort);
}
Eif (options.limit) {
cursor.limit(options.limit);
}
Iif (options.skip) {
cursor.skip(options.skip);
}
Iif (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();
}
}
/**
* Start a transaction (the DatabaseManager contract)
*
* `tx.query(collection, filter, options)` runs inside the transaction. For driver
* operations on `tx.collection(name)`, pass `{ session: tx.session }` yourself.
*
* @param {Object} [_pool] - Unused; the adapter instance is its own pool
* @param {Object} [options={}] - Driver transaction options (readConcern, writeConcern, ...)
* @returns {Promise<Object>} Transaction with session, query, collection, commit and rollback
*/
async function transaction(_pool, options = {}) {
Iif (!client) {
throw new Error('Database connection not established. Call connect() first.');
}
const session = client.startSession();
try {
session.startTransaction(options);
} catch (_error) {
await session.endSession();
throw _error;
}
const assertActive = () => {
if (tx.isCommitted || tx.isRolledBack) {
throw new Error('Transaction already completed');
}
};
const tx = {
session,
isCommitted: false,
isRolledBack: false,
async query(collectionName, filter = {}, queryOptions = {}) {
assertActive();
return query(collectionName, filter, { ...queryOptions, session });
},
collection(name) {
assertActive();
return collection(name);
},
async commit() {
assertActive();
try {
await session.commitTransaction();
tx.isCommitted = true;
} catch (_error) {
tx.isRolledBack = true;
await session.abortTransaction().catch(() => {});
throw _error;
} finally {
await session.endSession();
}
},
async rollback() {
assertActive();
tx.isRolledBack = true;
try {
await session.abortTransaction();
} finally {
await session.endSession();
}
}
};
return tx;
}
/**
* Get a raw driver collection for document operations
* (insertOne, findOne, updateOne, deleteOne, createIndex, …)
*
* @param {string} name - Collection name
* @returns {Object} MongoDB driver Collection
*/
function collection(name) {
if (!db) {
throw new Error('Database connection not established. Call connect() first.');
}
return db.collection(name);
}
/**
* Disconnect from the database
*
* @returns {Promise<void>}
*/
async function disconnect() {
if (client) {
await client.close();
client = null;
db = null;
}
}
/**
* Close the connection — DatabaseManager.close() calls closePool()
*
* @returns {Promise<void>}
*/
async function closePool() {
await disconnect();
}
/**
* 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,
collection,
beginTransaction,
commit,
rollback,
transaction,
disconnect,
closePool,
getConnection,
ping,
escape
};
return instance;
}
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