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* SQLite Database Adapter for Coherent.js
*
* @fileoverview SQLite adapter implementation with connection pooling and transaction support.
*/
/**
* Create a new SQLite adapter instance
*
* @returns {Object} SQLite adapter instance with database operations
*/
export function createSQLiteAdapter() {
let sqlite3 = null;
let db = null;
/**
* Initialize SQLite module
*
* @private
* @returns {Promise<void>}
*/
async function initializeSQLite() {
Eif (!sqlite3) {
try {
// Try to import sqlite3 (peer dependency)
const sqlite3Module = await import('sqlite3');
sqlite3 = sqlite3Module.default || sqlite3Module;
} catch {
throw new Error('Failed to load sqlite3 module. Make sure to install it: npm install sqlite3');
}
}
}
/**
* Connect to the database
*
* @param {Object} config - Database configuration
* @param {string} config.database - Path to the SQLite database file
* @param {boolean} [config.readonly=false] - Open the database in read-only mode
* @returns {Promise<Object>} The database adapter instance
*/
async function connect(config) {
await initializeSQLite();
return new Promise((resolve, reject) => {
try {
db = new sqlite3.Database(
config.database,
config.readonly ? sqlite3.OPEN_READONLY : sqlite3.OPEN_READWRITE | sqlite3.OPEN_CREATE,
(err) => {
Iif (err) {
return reject(new Error(`Failed to connect to SQLite database: ${err.message}`));
}
// Enable foreign keys by default
db.run('PRAGMA foreign_keys = ON');
// Enable WAL mode for better concurrency
db.run('PRAGMA journal_mode = WAL');
// Set busy timeout to handle concurrent write operations
db.run('PRAGMA busy_timeout = 5000');
resolve(instance);
}
);
} catch (_error) {
reject(new Error(`Failed to connect to SQLite database: ${_error.message}`));
}
});
}
/**
* Whether a statement produces rows (and must go through `db.all`) rather than a
* change count (`db.run`, which reports `lastID` / `changes`).
*
* @private
* @param {string} sql - SQL statement
* @returns {boolean}
*/
function returnsRows(sql) {
return /^\s*(SELECT|PRAGMA|WITH|EXPLAIN|VALUES)\b/i.test(sql) || /\bRETURNING\b/i.test(sql);
}
/**
* Execute a SQL query
*
* Row-returning statements resolve to `{ rows, rowCount }`. Other statements resolve
* to `{ rows: [], rowCount, affectedRows, insertId }`, where `affectedRows` is the
* number of changed rows and `insertId` the rowid of an INSERT (null otherwise).
*
* @param {string} sql - SQL query string
* @param {Array} [params=[]] - Query parameters
* @returns {Promise<{rows: Array<Object>, rowCount: number, affectedRows?: number, insertId?: number|null}>} Query result
*/
function query(sql, params = []) {
return new Promise((resolve, reject) => {
Iif (!db) {
return reject(new Error('Database connection not established. Call connect() first.'));
}
if (returnsRows(sql)) {
db.all(sql, params, (err, rows) => {
if (err) {
return reject(new Error(`SQLite query error: ${err.message}`));
}
resolve({ rows, rowCount: rows.length });
});
return;
}
db.run(sql, params, function(err) {
Iif (err) {
return reject(new Error(`SQLite query error: ${err.message}`));
}
resolve({
rows: [],
rowCount: this.changes,
affectedRows: this.changes,
insertId: /^\s*(INSERT|REPLACE)\b/i.test(sql) ? this.lastID : null
});
});
});
}
/**
* Execute a SQL statement
*
* @param {string} sql - SQL statement
* @param {Array} [params=[]] - Statement parameters
* @returns {Promise<{affectedRows: number, insertId: number}>} Execution result
*/
function execute(sql, params = []) {
return new Promise((resolve, reject) => {
if (!db) {
return reject(new Error('Database connection not established. Call connect() first.'));
}
db.run(sql, params, function(err) {
if (err) {
return reject(new Error(`SQLite execute error: ${err.message}`));
}
resolve({
affectedRows: this.changes,
insertId: this.lastID
});
});
});
}
/**
* Begin a transaction
*
* @returns {Promise<void>}
*/
function beginTransaction() {
return new Promise((resolve, reject) => {
if (!db) {
return reject(new Error('Database connection not established. Call connect() first.'));
}
db.run('BEGIN TRANSACTION', (err) => {
if (err) {
return reject(new Error(`Failed to begin transaction: ${err.message}`));
}
resolve();
});
});
}
/**
* Commit a transaction
*
* @returns {Promise<void>}
*/
function commit() {
return new Promise((resolve, reject) => {
if (!db) {
return reject(new Error('Database connection not established. Call connect() first.'));
}
db.run('COMMIT', (err) => {
if (err) {
return reject(new Error(`Failed to commit transaction: ${err.message}`));
}
resolve();
});
});
}
/**
* Rollback a transaction
*
* @returns {Promise<void>}
*/
function rollback() {
return new Promise((resolve, reject) => {
if (!db) {
return reject(new Error('Database connection not established. Call connect() first.'));
}
db.run('ROLLBACK', (err) => {
if (err) {
return reject(new Error(`Failed to rollback transaction: ${err.message}`));
}
resolve();
});
});
}
/**
* Start a transaction on the connection (the DatabaseManager transaction contract)
*
* SQLite has a single connection here: a second transaction started before the first
* one finishes fails with "cannot start a transaction within a transaction".
*
* @param {Object} [_pool] - Unused; the adapter instance is its own pool
* @param {Object} [options={}] - Transaction options
* @param {'DEFERRED'|'IMMEDIATE'|'EXCLUSIVE'} [options.mode] - SQLite locking mode
* @returns {Promise<Object>} Transaction with query, commit and rollback
*/
async function transaction(_pool, options = {}) {
const modes = ['DEFERRED', 'IMMEDIATE', 'EXCLUSIVE'];
const mode = options.mode === undefined ? null : String(options.mode).toUpperCase();
Iif (mode !== null && !modes.includes(mode)) {
throw new Error(`Invalid SQLite transaction mode: ${options.mode}. Use one of ${modes.join(', ')}`);
}
await run(mode ? `BEGIN ${mode} TRANSACTION` : 'BEGIN TRANSACTION', 'begin transaction');
const tx = {
isCommitted: false,
isRolledBack: false,
async query(sql, params) {
if (tx.isCommitted || tx.isRolledBack) {
throw new Error('Cannot execute query on completed transaction');
}
return query(sql, params);
},
async commit() {
Iif (tx.isCommitted || tx.isRolledBack) {
throw new Error('Transaction already completed');
}
try {
await run('COMMIT', 'commit transaction');
tx.isCommitted = true;
} catch (commitError) {
// Leave the connection usable: a failed COMMIT keeps the transaction open.
await run('ROLLBACK', 'rollback transaction').catch(() => {});
tx.isRolledBack = true;
throw commitError;
}
},
async rollback() {
Iif (tx.isCommitted || tx.isRolledBack) {
throw new Error('Transaction already completed');
}
tx.isRolledBack = true;
await run('ROLLBACK', 'rollback transaction');
}
};
return tx;
}
/**
* Run a control statement (BEGIN / COMMIT / ROLLBACK)
*
* @private
*/
function run(sql, action) {
return new Promise((resolve, reject) => {
Iif (!db) {
return reject(new Error('Database connection not established. Call connect() first.'));
}
db.run(sql, (err) => {
Iif (err) {
return reject(new Error(`Failed to ${action}: ${err.message}`));
}
resolve();
});
});
}
/**
* Connection statistics (the DatabaseManager getStats contract)
*
* @returns {{total: number, available: number, acquired: number, waiting: number}}
*/
function getPoolStats() {
const open = db ? 1 : 0;
return { total: open, available: open, acquired: 0, waiting: 0 };
}
/**
* Disconnect from the database
*
* @returns {Promise<void>}
*/
function disconnect() {
return new Promise((resolve, reject) => {
Iif (!db) {
return resolve();
}
db.close((err) => {
Iif (err) {
return reject(new Error(`Failed to close database connection: ${err.message}`));
}
db = null;
resolve();
});
});
}
/**
* Get the underlying database connection
*
* @returns {Object} The database connection
*/
function getConnection() {
if (!db) {
throw new Error('Database connection not established. Call connect() first.');
}
return db;
}
/**
* Ping the database to check if connection is alive
*
* @returns {Promise<boolean>} True if connection is alive
*/
async function ping() {
try {
await query('SELECT 1');
return true;
} catch {
return false;
}
}
/**
* Escape a value for SQL queries
*
* @param {*} value - Value to escape
* @returns {string} Escaped value
*/
function escape(value) {
if (value === null || value === undefined) {
return 'NULL';
}
if (typeof value === 'boolean') {
return value ? '1' : '0';
}
if (typeof value === 'number') {
return String(value);
}
// Escape single quotes by doubling them
return `'${String(value).replace(/'/g, "''")}'`;
}
// Public API
const instance = {
connect,
query,
execute,
beginTransaction,
commit,
rollback,
transaction,
getPoolStats,
disconnect,
getConnection,
ping,
escape
};
return instance;
}
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