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* Database Middleware for Coherent.js Router Integration
*
* @fileoverview Provides middleware for seamless database integration with the router,
* including connection management, transaction handling, and query helpers.
*/
/**
* Database middleware for router integration
*
* @param {DatabaseManager} db - Database manager instance
* @param {Object} [options={}] - Middleware options
* @returns {Function} Middleware function
*
* @example
* import { withDatabase } from '@coherent/database';
*
* const router = new SimpleRouter();
* router.use(withDatabase(db));
*
* router.get('/users', async (req, res) => {
* const users = await req.db.query('SELECT * FROM users');
* res.json(users.rows);
* });
*/
export function withDatabase(db, options = {}) {
const config = {
autoConnect: true,
attachModels: true,
transactionKey: 'tx',
...options
};
return async (req, res, next) => {
try {
// Ensure database is connected
if (config.autoConnect && !db.isConnected) {
await db.connect();
}
// Attach database to request
req.db = db;
// Attach query helper (preserve original req.query)
req.dbQuery = async (sql, params, queryOptions) => {
return await db.query(sql, params, queryOptions);
};
// Attach transaction helper
req.transaction = async (callback) => {
const tx = await db.transaction();
try {
const result = await callback(tx);
await tx.commit();
return result;
} catch (error) {
await tx.rollback();
throw error;
}
};
// Attach models if configured
if (config.attachModels && db.models) {
req.models = db.models;
}
await next();
} catch (error) {
// Log database errors
console.error('Database middleware error:', error);
// Pass error to error handler
if (typeof next === 'function') {
next(error);
} else {
throw error;
}
}
};
}
/**
* Transaction middleware for automatic transaction management
*
* @param {DatabaseManager} db - Database manager instance
* @param {Object} [options={}] - Transaction options
* @returns {Function} Middleware function
*
* @example
* router.post('/transfer', withTransaction(db), async (req, res) => {
* // All database operations in this handler will be wrapped in a transaction
* await req.tx.query('UPDATE accounts SET balance = balance - ? WHERE id = ?', [amount, fromId]);
* await req.tx.query('UPDATE accounts SET balance = balance + ? WHERE id = ?', [amount, toId]);
* // Transaction is automatically committed on success or rolled back on error
* });
*/
export function withTransaction(db, options = {}) {
const config = {
isolationLevel: null,
readOnly: false,
...options
};
return async (req, res, next) => {
const tx = await db.transaction(config);
req.tx = tx;
try {
await next();
// Commit transaction if not already committed
if (!tx.isCommitted && !tx.isRolledBack) {
await tx.commit();
}
} catch (error) {
// Rollback transaction if not already rolled back
if (!tx.isRolledBack && !tx.isCommitted) {
await tx.rollback();
}
throw error;
}
};
}
/**
* Model binding middleware
*
* @param {Function} ModelClass - Model class to bind
* @param {string} [paramName='id'] - Route parameter name
* @param {string} [requestKey] - Request key to attach model (defaults to model name)
* @returns {Function} Middleware function
*
* @example
* router.get('/users/:id', withModel(User), async (req, res) => {
* // req.user contains the loaded User model
* res.json(req.user.toJSON());
* });
*
* router.get('/posts/:postId', withModel(Post, 'postId', 'post'), async (req, res) => {
* // req.post contains the loaded Post model
* res.json(req.post.toJSON());
* });
*/
export function withModel(ModelClass, paramName = 'id', requestKey = null) {
const key = requestKey || ModelClass.name.toLowerCase();
return async (req, res, next) => {
try {
const paramValue = req.params[paramName];
if (!paramValue) {
const error = new Error(`Parameter '${paramName}' is required`);
error.status = 400;
throw error;
}
const model = await ModelClass.find(paramValue);
if (!model) {
const error = new Error(`${ModelClass.name} not found`);
error.status = 404;
throw error;
}
req[key] = model;
await next();
} catch (error) {
if (typeof next === 'function') {
next(error);
} else {
throw error;
}
}
};
}
/**
* Pagination middleware
*
* @param {Object} [options={}] - Pagination options
* @returns {Function} Middleware function
*
* @example
* router.get('/users', withPagination(), async (req, res) => {
* const users = await User.query()
* .limit(req.pagination.limit)
* .offset(req.pagination.offset)
* .execute();
*
* res.json({
* data: users.rows,
* pagination: req.pagination
* });
* });
*/
export function withPagination(options = {}) {
const config = {
defaultLimit: 20,
maxLimit: 100,
pageParam: 'page',
limitParam: 'limit',
...options
};
return async (req, res, next) => {
const page = Math.max(1, parseInt(req.query[config.pageParam]) || 1);
const limit = Math.min(
config.maxLimit,
Math.max(1, parseInt(req.query[config.limitParam]) || config.defaultLimit)
);
const offset = (page - 1) * limit;
req.pagination = {
page,
limit,
offset,
hasNext: null, // To be set by the handler
hasPrev: page > 1,
totalPages: null, // To be set by the handler
totalCount: null // To be set by the handler
};
await next();
};
}
/**
* Query validation middleware
*
* @param {Object} schema - Validation schema
* @param {Object} [options={}] - Validation options
* @returns {Function} Middleware function
*
* @example
* router.get('/users', withQueryValidation({
* status: { type: 'string', enum: ['active', 'inactive'] },
* age: { type: 'number', min: 0, max: 120 }
* }), async (req, res) => {
* // req.query is validated and sanitized
* });
*/
export function withQueryValidation(schema, options = {}) {
const config = {
stripUnknown: true,
coerceTypes: true,
...options
};
return async (req, res, next) => {
try {
const validatedQuery = {};
for (const [key, rules] of Object.entries(schema)) {
const value = req.query[key];
// Skip if not provided and not required
if (value === undefined || value === null || value === '') {
if (rules.required) {
const error = new Error(`Query parameter '${key}' is required`);
error.status = 400;
throw error;
}
continue;
}
// Type coercion
let coercedValue = value;
if (config.coerceTypes) {
switch (rules.type) {
case 'number':
coercedValue = Number(value);
if (isNaN(coercedValue)) {
const error = new Error(`Query parameter '${key}' must be a number`);
error.status = 400;
throw error;
}
break;
case 'boolean':
coercedValue = value === 'true' || value === '1';
break;
case 'array':
coercedValue = Array.isArray(value) ? value : [value];
break;
}
}
// Validation
if (rules.enum && !rules.enum.includes(coercedValue)) {
const error = new Error(`Query parameter '${key}' must be one of: ${rules.enum.join(', ')}`);
error.status = 400;
throw error;
}
if (rules.min !== undefined && coercedValue < rules.min) {
const error = new Error(`Query parameter '${key}' must be at least ${rules.min}`);
error.status = 400;
throw error;
}
if (rules.max !== undefined && coercedValue > rules.max) {
const error = new Error(`Query parameter '${key}' must be at most ${rules.max}`);
error.status = 400;
throw error;
}
validatedQuery[key] = coercedValue;
}
// Replace query with validated version
if (!config.stripUnknown) {
Object.assign(validatedQuery, req.query);
}
req.query = validatedQuery;
await next();
} catch (error) {
if (typeof next === 'function') {
next(error);
} else {
throw error;
}
}
};
}
/**
* Database health check middleware
*
* @param {DatabaseManager} db - Database manager instance
* @param {Object} [options={}] - Health check options
* @returns {Function} Middleware function
*
* @example
* router.get('/health', withHealthCheck(db), (req, res) => {
* res.json({ status: 'healthy', database: req.dbHealth });
* });
*/
export function withHealthCheck(db, options = {}) {
const config = {
timeout: 5000,
includeStats: true,
...options
};
return async (req, res, next) => {
try {
const startTime = Date.now();
// Test database connection
await Promise.race([
db.query('SELECT 1'),
new Promise((_, reject) =>
setTimeout(() => reject(new Error('Health check timeout')), config.timeout)
)
]);
const responseTime = Date.now() - startTime;
req.dbHealth = {
status: 'healthy',
responseTime,
connected: db.isConnected
};
if (config.includeStats) {
req.dbHealth.stats = db.getStats();
}
await next();
} catch (error) {
req.dbHealth = {
status: 'unhealthy',
error: error.message,
connected: db.isConnected
};
await next();
}
};
}
/**
* Connection pooling middleware for request-scoped connections
*
* @param {DatabaseManager} db - Database manager instance
* @param {Object} [options={}] - Pool options
* @returns {Function} Middleware function
*
* @example
* router.use(withConnectionPool(db, { acquireTimeout: 10000 }));
*/
export function withConnectionPool(db, options = {}) {
const config = {
acquireTimeout: 30000,
releaseOnResponse: true,
...options
};
return async (req, res, next) => {
let connection = null;
try {
// Acquire connection from pool
connection = await db.pool.acquire(config.acquireTimeout);
// Attach connection to request
req.dbConnection = connection;
// Attach query helper to use this connection
req.dbQuery = async (sql, params, queryOptions) => {
return await db.adapter.query(connection, sql, params, queryOptions);
};
// Release connection when response finishes
if (config.releaseOnResponse) {
res.on('finish', () => {
if (connection) {
db.pool.release(connection);
}
});
}
await next();
} catch (error) {
// Release connection on error
if (connection) {
db.pool.release(connection);
}
throw error;
}
};
}
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