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utils/logger.js

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+/* + + + + + + + + + + + + + + + + + + + + +
+* Logger
+* -----------
+* a winston instance wrapper
+*
+* Author: Michael Samonte
+*
++ + + + + + + + + + + + + + + + + + + + + */
+let fs = require('fs');
+let winston = require('winston');
+let createLogger = winston.createLogger;
+let format = winston.format;
+let transports = winston.transports;
+
+/* + + + + + + + + + + + + + + + + + + + + +
+// Start
++ + + + + + + + + + + + + + + + + + + + + */
+const { combine, timestamp, printf } = format;
+const logFormat = printf(info => {
+  return `${info.timestamp} : ${info.level}: [${info.label}] : ${info.message}`;
+});
+const logger = createLogger({
+  level: 'info',
+  format: combine(timestamp(), logFormat),
+  transports: [
+    new transports.File({
+      filename: './logs/error.log',
+      level: 'error',
+    }),
+    new transports.File({
+      filename: './logs/out.log',
+    }),
+  ],
+});
+
+/**
+ * create logs folder if it does not exist
+ */
+if (!fs.existsSync('logs')) {
+  fs.mkdirSync('logs');
+}
+
+/**
+ * @param {string} label group label
+ * @param {string} message log message
+ */
+function log(label, message) {
+  console.log(new Date(), label, message);
+  logger.log({
+    level: 'info',
+    label: label,
+    message: JSON.stringify(message),
+  });
+}
+
+/**
+ * TODO: we can do additional reporting here
+ * @param {string} label group label
+ * @param {string} message log message
+ */
+function error(label, message) {
+  console.error(new Date(), label, message);
+  logger.log({
+    level: 'error',
+    label: label,
+    message: JSON.stringify(message),
+  });
+}
+
+exports.log = log;
+exports.error = error;