src/config/logger.js

/*
 * Copyright 2019-present Open Networking Foundation

 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at

 * http://www.apache.org/licenses/LICENSE-2.0

 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

(function () {
    'use strict';
    
    const winston = require('winston');
    const fs = require('fs');
    const path = require('path');
    const level = process.env.LOG_LEVEL || 'debug';
    winston.level = level;
  
    const logFile = path.join(__dirname, '../../logs/cord-workflow-control-service');
  
    // clear old logs
    ['error', 'debug'].forEach(l => {
        try {
            fs.statSync(`${logFile}.${l}.log`)
            fs.unlinkSync(`${logFile}.${l}.log`);
        }
        catch(e) {
            // log does not exist
        }
    });
  
    // create a custom logger with colorized console and persistance to file
    const logger = winston.createLogger({
        transports: [
            new (winston.transports.Console)({level: level, colorize: true}),
            new (winston.transports.File)({name: 'error-log', level: 'error', filename: `${logFile}.error.log`}),
            new (winston.transports.File)({name: 'debug-log', level: 'debug', filename: `${logFile}.debug.log`})
        ]
    });
  
    module.exports = logger;  
})();