feat: incorporate environment settings and custom error and access lo…

…gging capability

src/modules/Constants.js

@@ -0,0 +1,9 @@
+export const ENV = {
+    PRODUCTION: 'production',
+    DEVELOPMENT: 'development'
+};
+
+export const ERROR_LEVELS = {
+    WARNING: 'WARNING',
+    FATAL: 'FATAL'
+};

src/modules/Logger.js

@@ -1,31 +1,121 @@
-export default {
+/**
+ *@module Logger
+*/
+import fs from 'fs';
+import { ERROR_LEVELS, ENV } from './Constants';
+import { ServerResponse } from 'http';
+
+export default class Logger {
+
+    /**
+     *@param {string} errorLog - path to error log file
+     *@param {string} accessLog - path to access log file
+     *@param {Object} config - the server config object
+    */
+    constructor(errorLog, accessLog, config) {
+
+        this.config = config;
+        this.errorHandle = null;
+        this.accessHandle = null;
+
+        this.init(errorLog, accessLog);
+    }
+
+    /**
+     * initializes the log files
+     *@param {string} errorLog - path to error log file
+     *@param {string} accessLog - path to access log file
+    */
+    init(errorLog, accessLog) {
+        this.errorHandle = fs.openSync(errorLog, 'a');
+        this.accessHandle = fs.openSync(accessLog, 'a');
+    }
+
+    /**
+     * close the handles once the server is closed
+    */
+    close() {
+        fs.closeSync(this.errorHandle);
+        fs.closeSync(this.accessHandle);
+    }
+
+    /**
+     * runs the error logging
+    */
+    logError(level, stack) {
+        const now = new Date();
+        fs.writeSync(
+            this.errorHandle,
+            `[${now.toUTCString()}] [${level}] ${stack}\r\n`
+        );
+    }
+
+    /**
+     * logs access information
+    */
+    logAccess(req, res) {
+        const log = `[${req.startTime.toUTCString()}] "${req.method} ${req.url}`
+        +
+        ` Http/${req.httpVersion}" ${res.statusCode}\r\n`;
+
+        fs.writeSync(this.accessHandle, log);
+    }
+
+    /**
+     * log request response profile
+     *@param {http.IncomingMessage} req - the request object
+     *@param {http.ServerResponse} res - the response object
+    */
+    profile(req, res) {
+        this.logAccess(req, res);
+        if (this.config.env === ENV.DEVELOPMENT && this.config.profileRequest) {
+            if (res.statusCode >= 400)
+                console.log('%s: %s \x1b[31m%d\x1b[0m ~%dms ~%dms\x1b[0m', req.method, req.url,
+                    res.statusCode, res.startTime - req.startTime, Date.now() - res.startTime);
+            else
+                console.log('%s: %s \x1b[32m%d\x1b[0m ~%dms ~%dms\x1b[0m', req.method, req.url,
+                    res.statusCode, res.startTime - req.startTime, Date.now() - res.startTime);
+        }
+    }
+
+    /**
+     * logs a warning to the file
+    */
+    warn(message) {
+        this.logError(ERROR_LEVELS.WARNING, message, '');
+    }
+
+    /**
+     * logs a fatal error to the file and ends the response
+     *@param {http.ServerResponse} response - the response object
+     *@param {Error} ex - the error that just occured
+    */
+    fatal({stack}, response, errorCode) {
+
+        this.logError(ERROR_LEVELS.FATAL, stack);
+        if (response instanceof ServerResponse) {
+            if (this.config.env === ENV.DEVELOPMENT) {
+                response.end(stack);
+            }
+            else {
+                response.status(errorCode || 500).end();
+            }
+        }
+    }
+
     /**
      * log error message to the console
      *@param {string} message - the error message
     */
     error(message) {
         console.log('\x1b[1m\x1b[31m%s\x1b[0m', message);
-    },
+    }
 
     /**
      * log info message to the console
      *@param {string} message - the info message
     */
     info(message) {
         console.log('\x1b[1m\x1b[32m%s\x1b[0m', message);
-    },
-
-    /**
-     * log request response profile
-     *@param {http.IncomingMessage} req - the request object
-     *@param {RServerResponse} res - the response object
-    */
-    logProfile(req, res) {
-        if (res.statusCode >= 400)
-            console.log('%s: %s \x1b[31m%d\x1b[0m ~%dms ~%dms\x1b[0m', req.method, req.url,
-                res.statusCode, res.startTime - req.startTime, Date.now() - res.startTime);
-        else
-            console.log('%s: %s \x1b[32m%d\x1b[0m ~%dms ~%dms\x1b[0m', req.method, req.url,
-                res.statusCode, res.startTime - req.startTime, Date.now() - res.startTime);
     }
-};
+}