import { Request, Response, NextFunction } from 'express';
interface LogEntry {
timestamp: string;
method: string;
url: string;
ip: string;
userAgent: string;
statusCode: number;
responseTime: number;
error?: string;
}
const logs: LogEntry[] = [];
const MAX_LOGS = 1000;
export const requestLogger = (req: Request, res: Response, next: NextFunction) => {
const start = Date.now();
const originalSend = res.send;
res.send = function (data) {
const responseTime = Date.now() - start;
const logEntry: LogEntry = {
timestamp: new Date().toISOString(),
method: req.method,
url: req.originalUrl,
ip: req.ip || req.connection.remoteAddress || 'unknown',
userAgent: req.get('User-Agent') || 'unknown',
statusCode: res.statusCode,
responseTime
};
// Add error info if status code indicates error
if (res.statusCode >= 400) {
logEntry.error = data?.toString() || 'Unknown error';
}
logs.push(logEntry);
if (logs.length > MAX_LOGS) {
logs.splice(0, logs.length - MAX_LOGS);
}
if (process.env.NODE_ENV === 'development') {
console.log(`[${logEntry.timestamp}] ${logEntry.method} ${logEntry.url} - ${logEntry.statusCode} (${logEntry.responseTime}ms)`);
}
return originalSend.call(this, data);
};
next();
};
export const getLogs = (limit: number = 100): LogEntry[] => {
return logs.slice(-limit);
};
export const clearLogs = (): void => {
logs.length = 0;
};
