type LogLevel = 'DEBUG' | 'INFO' | 'WARN' | 'ERROR';
class SimpleLogger {
private logLevel: LogLevel;
private serviceName: string;
constructor(serviceName: string = 'mkdocs-mcp', logLevel: LogLevel = 'INFO') {
this.serviceName = serviceName;
this.logLevel = (process.env.LOG_LEVEL as LogLevel) || logLevel;
}
private shouldLog(level: LogLevel): boolean {
const levels: Record<LogLevel, number> = {
DEBUG: 0,
INFO: 1,
WARN: 2,
ERROR: 3
};
return levels[level] >= levels[this.logLevel];
}
private formatMessage(level: LogLevel, message: string, meta?: any): string {
const timestamp = new Date().toISOString();
const metaStr = meta ? ` ${JSON.stringify(meta)}` : '';
return `${timestamp} [${level}] ${this.serviceName}: ${message}${metaStr}`;
}
private writeToStderr(message: string): void {
process.stderr.write(message + '\n');
}
debug(message: string, meta?: any): void {
if (this.shouldLog('DEBUG')) {
this.writeToStderr(this.formatMessage('DEBUG', message, meta));
}
}
info(message: string, meta?: any): void {
if (this.shouldLog('INFO')) {
this.writeToStderr(this.formatMessage('INFO', message, meta));
}
}
warn(message: string, meta?: any): void {
if (this.shouldLog('WARN')) {
this.writeToStderr(this.formatMessage('WARN', message, meta));
}
}
error(message: string, meta?: any): void {
if (this.shouldLog('ERROR')) {
this.writeToStderr(this.formatMessage('ERROR', message, meta));
}
}
}
export const logger = new SimpleLogger();
