@siva-sub/mcp-public-transport/dist/esm/utils/logger.js

A Model Context Protocol server for Singapore transport data with real-time information and routing

class Logger {
    logLevel;
    constructor() {
        this.logLevel = process.env.LOG_LEVEL || 'info';
    }
    shouldLog(level) {
        const levels = {
            debug: 0,
            info: 1,
            warn: 2,
            error: 3,
        };
        return levels[level] >= levels[this.logLevel];
    }
    formatMessage(level, message, meta) {
        const entry = {
            timestamp: new Date().toISOString(),
            level,
            message,
            meta,
        };
        return JSON.stringify(entry);
    }
    log(level, message, meta) {
        if (!this.shouldLog(level))
            return;
        const formatted = this.formatMessage(level, message, meta);
        // Always use stderr to avoid interfering with MCP JSON-RPC on stdout
        process.stderr.write(formatted + '\n');
    }
    debug(message, meta) {
        this.log('debug', message, meta);
    }
    info(message, meta) {
        this.log('info', message, meta);
    }
    warn(message, meta) {
        this.log('warn', message, meta);
    }
    error(message, error) {
        const meta = error instanceof Error
            ? {
                message: error.message,
                stack: error.stack,
                name: error.name
            }
            : error;
        this.log('error', message, meta);
    }
}
export const logger = new Logger();