logger.js

/*
 * Copyright © 2016-2019 The Thingsboard Authors
 *
 * 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.
 */
var config = require('config'),
    path = require('path'),
    DailyRotateFile = require('winston-daily-rotate-file');

const { createLogger, format, transports } = require('winston');
const { combine, timestamp, label, printf, splat } = format;

var loggerTransports = [];

if (process.env.NODE_ENV !== 'production' || process.env.DOCKER_MODE === 'true') {
    loggerTransports.push(new transports.Console({
        handleExceptions: true
    }));
} else {
    var filename = path.join(config.get('logger.path'), config.get('logger.filename'));
    var transport = new (DailyRotateFile)({
        filename: filename,
        datePattern: 'YYYY-MM-DD-HH',
        zippedArchive: true,
        maxSize: '20m',
        maxFiles: '14d',
        handleExceptions: true
    });
    loggerTransports.push(transport);
}

const tbFormat = printf(info => {
    return `${info.timestamp} [${info.label}] ${info.level.toUpperCase()}: ${info.message}`;
});

function _logger(moduleLabel) {
    return createLogger({
        level: config.get('logger.level'),
        format:combine(
            splat(),
            label({ label: moduleLabel }),
            timestamp({format: 'YYYY-MM-DD HH:mm:ss,SSS'}),
            tbFormat
        ),
        transports: loggerTransports
    });
}

module.exports = _logger;