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src/utils/logger.js

@@ -0,0 +1,103 @@
+/**
+ * logger.js
+ * Handles logging functionality
+ */
+const fs = require('fs');
+const path = require('path');
+const { LOGGING_CONFIG } = require('../config/appConfig');
+
+// Define log levels and their priority (higher number = higher priority)
+const LOG_LEVELS = {
+  DEBUG: 1,
+  INFO: 2,
+  WARN: 3,
+  ERROR: 4
+};
+
+// Get configured log level from config, default to INFO if not specified
+const configuredLevel = (LOGGING_CONFIG?.level || 'info').toUpperCase();
+const configuredLevelValue = LOG_LEVELS[configuredLevel] || LOG_LEVELS.INFO;
+
+// Ensure logs directory exists
+const LOGS_DIR = path.join(__dirname, '..', '..', 'logs');
+if (!fs.existsSync(LOGS_DIR)) {
+  fs.mkdirSync(LOGS_DIR, { recursive: true });
+}
+
+// Use log file from config if available, otherwise use default
+const LOG_FILE = LOGGING_CONFIG?.file 
+  ? path.resolve(path.join(__dirname, '..', '..'), LOGGING_CONFIG.file)
+  : path.join(LOGS_DIR, 'fylgja.log');
+
+// Create logger object
+const logger = {
+  /**
+   * Internal method to write log entry to file and console if level meets threshold
+   * @param {string} level - Log level (DEBUG, INFO, WARN, ERROR)
+   * @param {string} message - Log message to write
+   */
+  _writeToFile: (level, message) => {
+    // Check if this log level should be displayed based on configured level
+    const levelValue = LOG_LEVELS[level] || 0;
+    
+    if (levelValue >= configuredLevelValue) {
+      const timestamp = new Date().toISOString();
+      const logEntry = `${timestamp} ${level}: ${message}\n`;
+      
+      // Append to log file
+      try {
+        fs.appendFileSync(LOG_FILE, logEntry);
+      } catch (err) {
+        console.error(`Failed to write to log file: ${err.message}`);
+      }
+      
+      // Also log to console with appropriate method
+      switch (level) {
+        case 'ERROR':
+          console.error(logEntry.trim());
+          break;
+        case 'WARN':
+          console.warn(logEntry.trim());
+          break;
+        case 'DEBUG':
+          console.debug(logEntry.trim());
+          break;
+        case 'INFO':
+        default:
+          console.info(logEntry.trim());
+      }
+    }
+  },
+  
+  /**
+   * Log an info message
+   * @param {string} message - Message to log
+   */
+  info: (message) => logger._writeToFile('INFO', message),
+  
+  /**
+   * Log an error message
+   * @param {string} message - Message to log
+   */
+  error: (message) => logger._writeToFile('ERROR', message),
+  
+  /**
+   * Log a warning message
+   * @param {string} message - Message to log
+   */
+  warn: (message) => logger._writeToFile('WARN', message),
+  
+  /**
+   * Log a debug message
+   * @param {string} message - Message to log
+   */
+  debug: (message) => logger._writeToFile('DEBUG', message),
+  
+  /**
+   * Get the current log level
+   * @returns {string} Current log level
+   */
+  getLogLevel: () => configuredLevel
+};
+
+module.exports = logger;