provider/Logger.js

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 _ = require('lodash');
var moment = require('moment');
var winston = require('winston');
var safeStringify = require('json-stringify-safe');

var logger = new winston.Logger({
    transports: [
        new winston.transports.Console({
            timestamp: function() {
                return moment.utc().format("YYYY-MM-DDTHH:mm:ss.SSS") + 'Z';
            },
            formatter: function(options) {
                // Return string will be passed to logger.
                return '[' + options.timestamp() +'] ['+ options.level.toUpperCase() +'] [??] [cloudantTrigger] ' + options.message;
            }
        })
    ]
});

function getMessage(argsObject) {
    var args = Array.prototype.slice.call(argsObject);
    args.shift();
    args.forEach(function(arg, i) {
        if (_.isObject(args[i])) {
            args[i] = safeStringify(args[i]);
        }
    });
    return args.join(' ');
}

// FORMAT: s"[$time] [$category] [$id] [$componentName] [$name] $message"
module.exports = {
    info: function(name) {
        logger.info('['+name+']', getMessage(arguments));
    },
    warn: function(name) {
        logger.warn('['+name+']', getMessage(arguments));
    },
    error: function(name) {
        logger.error('['+name+']', getMessage(arguments));
    },
    debug: function(name) {
        logger.debug('['+name+']', getMessage(arguments));
    }
};