Google Business Profile Review MCP Server

/** * Logging utility for the Google Business Profile Review MCP Server */ export type LogLevel = 'debug' | 'info' | 'warn' | 'error'; interface LogEntry { timestamp: string; level: LogLevel; message: string; data?: any; } class Logger { private logLevel: LogLevel; private isStdioTransport: boolean; constructor() { this.logLevel = (process.env.LOG_LEVEL as LogLevel) || 'info'; this.isStdioTransport = process.env.TRANSPORT_MODE === 'stdio'; } 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, data?: any): string { const timestamp = new Date().toISOString(); const logEntry: LogEntry = { timestamp, level, message, ...(data && { data }) }; return JSON.stringify(logEntry); } private log(level: LogLevel, message: string, data?: any): void { if (!this.shouldLog(level)) { return; } const formattedMessage = this.formatMessage(level, message, data); // Always write to stderr when using STDIO transport (MCP protocol uses stdin/stdout) // For HTTP transport, stderr is also appropriate for server logs process.stderr.write(formattedMessage + '\n'); } debug(message: string, data?: any): void { this.log('debug', message, data); } info(message: string, data?: any): void { this.log('info', message, data); } warn(message: string, data?: any): void { this.log('warn', message, data); } error(message: string, data?: any): void { this.log('error', message, data); } /** * Debug output for STDIO transport - only outputs in non-production environments * and when log level is debug. Always writes to stderr to avoid interfering with * MCP protocol messages on stdin/stdout. */ stdioDebug(message: string): void { if (this.isStdioTransport && this.logLevel === 'debug' && process.env.NODE_ENV !== 'production') { process.stderr.write(`[STDIO DEBUG] ${message}\n`); } } } export const logger = new Logger();