/**
* Logger utility for MCP server
* Ensures logs don't interfere with MCP protocol
*/
// Environment variable to control log level
const LOG_LEVEL = process.env.LOG_LEVEL || 'info';
// Log levels
const LOG_LEVELS: Record<string, number> = {
debug: 0,
info: 1,
warn: 2,
error: 3,
};
// Check if the current log level allows the specified level
function shouldLog(level: string): boolean {
const currentLevel = LOG_LEVELS[LOG_LEVEL.toLowerCase()] || LOG_LEVELS.info;
const requestedLevel = LOG_LEVELS[level.toLowerCase()] || LOG_LEVELS.info;
return requestedLevel >= currentLevel;
}
// Log to a file instead of stdout/stderr to avoid interfering with MCP protocol
function logToFile(level: string, message: string, data?: unknown): void {
// In a real implementation, this would write to a file
// For now, we'll just use console.log directly for visibility during debugging
const logData = data ? ` ${JSON.stringify(data)}` : '';
console.log(`[${level}] ${message}${logData}`);
}
// Logger functions
export const logger = {
debug: (message: string, data?: unknown) => {
if (shouldLog('debug')) {
logToFile('DEBUG', message, data);
}
},
info: (message: string, data?: unknown) => {
if (shouldLog('info')) {
logToFile('INFO', message, data);
}
},
warn: (message: string, data?: unknown) => {
if (shouldLog('warn')) {
logToFile('WARN', message, data);
}
},
error: (message: string, data?: unknown) => {
if (shouldLog('error')) {
logToFile('ERROR', message, data);
}
},
};
