import { config } from './config.js';
export interface LogContext {
requestId?: string;
duration?: number;
[key: string]: unknown;
}
export class Logger {
private level: string;
constructor() {
this.level = config.logging.level;
}
private shouldLog(level: string): boolean {
const levels = ['error', 'warn', 'info', 'debug'];
const currentLevelIndex = levels.indexOf(this.level);
const messageLevelIndex = levels.indexOf(level);
return messageLevelIndex <= currentLevelIndex;
}
private log(level: string, message: string, context: LogContext = {}): void {
if (!this.shouldLog(level)) return;
const logEntry = {
timestamp: new Date().toISOString(),
level,
message,
...context,
};
// Write logs to stderr to avoid interfering with MCP protocol on stdout
console.error(JSON.stringify(logEntry));
}
error(message: string, context: LogContext = {}): void {
this.log('error', message, context);
}
warn(message: string, context: LogContext = {}): void {
this.log('warn', message, context);
}
info(message: string, context: LogContext = {}): void {
this.log('info', message, context);
}
debug(message: string, context: LogContext = {}): void {
this.log('debug', message, context);
}
}
export const logger = new Logger();
