albanm/winston-configure

var winston = require('winston');

module.exports = function(options) {

    // No noisy default behavior, the purpose of this module is explicit configuration
    winston.loggers.default.transports[0].silent = true;

    options.transports = options.transports || {};
    options.loggers = options.loggers || {};

    Object.keys(options.loggers).forEach(function(loggerName) {

        var loggerOptions = options.loggers[loggerName];

        var loggerTransports = loggerOptions.map(function(transportOptions) {
            if (typeof transportOptions === 'string' && options.transports[transportOptions]){
                options.transports[transportOptions].name = transportOptions;
                transportOptions = options.transports[transportOptions];
            }
            var Transport = winston.transports[transportOptions.type];
            if (!Transport) {
                throw new Error('winston-configure error - ' + transportOptions.type + ' transports unknown, avaiable transports are ' + JSON.stringify(Object.keys(winston.transports)));
            }
            return new Transport(transportOptions);
        });

        if (loggerName === 'default') {
            winston.loggers.options.transports = loggerTransports;
        } else {
            winston.loggers.add(loggerName, {
                transports: loggerTransports
            });
        }

    });

    var ownLogger = winston.loggers.get('winston-configure');
    ownLogger.debug('winston-configure configured %s logger(s)', Object.keys(options.loggers).length);
    for (var loggerName2 in options.loggers) {
        var transportOptions2 = options.loggers[loggerName2];
        ownLogger.debug('winston-configure configured "%s" logger on %s transport(s)', loggerName2, transportOptions2.length);
        ownLogger.silly('winston-configure configured "%s" logger with using following options', loggerName2, transportOptions2);
    }
};