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logger.js
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import chalk from 'chalk';
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import moment from 'moment';
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const LogLevel = {
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INFO: 'INFO',
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WARN: 'WARN',
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ERROR: 'ERROR',
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DEBUG: 'DEBUG'
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};
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class Logger {
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static formatMessage(level, message) {
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const timestamp = moment().format('YYYY-MM-DD HH:mm:ss');
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switch(level) {
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case LogLevel.INFO:
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return chalk.blue(`[${timestamp}] [${level}] ${message}`);
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case LogLevel.WARN:
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return chalk.yellow(`[${timestamp}] [${level}] ${message}`);
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case LogLevel.ERROR:
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return chalk.red(`[${timestamp}] [${level}] ${message}`);
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case LogLevel.DEBUG:
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return chalk.gray(`[${timestamp}] [${level}] ${message}`);
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default:
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return message;
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}
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}
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static info(message, context) {
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console.log(this.formatMessage(LogLevel.INFO, context ? `[${context}] ${message}` : message));
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}
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static warn(message, context) {
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console.warn(this.formatMessage(LogLevel.WARN, context ? `[${context}] ${message}` : message));
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}
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static error(message, context, error = null) {
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const errorMessage = error ? ` - ${error.message}` : '';
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console.error(this.formatMessage(LogLevel.ERROR, `${context ? `[${context}] ` : ''}${message}${errorMessage}`));
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}
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static debug(message, context) {
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if (process.env.NODE_ENV === 'development') {
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console.debug(this.formatMessage(LogLevel.DEBUG, context ? `[${context}] ${message}` : message));
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}
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}
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static requestLogger(req, res, next) {
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const startTime = Date.now();
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res.on('finish', () => {
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const duration = Date.now() - startTime;
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const logMessage = `${req.method} ${req.path} - ${res.statusCode} (${duration}ms)`;
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if (res.statusCode >= 400) {
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Logger.error(logMessage, undefined, 'HTTP');
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} else {
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Logger.info(logMessage, 'HTTP');
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}
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});
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next();
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}
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}
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export default Logger;
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