+const timestampFormatter = winston.format.timestamp({
+ format: 'YYYY-MM-DD HH:mm:ss.SSS'
+})
+const labelFormatter = (suffix?: string) => {
+ return winston.format.label({
+ label: suffix ? `${label} ${suffix}` : label
+ })
+}
+
+const fileLoggerOptions: FileTransportOptions = {
+ filename: path.join(CONFIG.STORAGE.LOG_DIR, LOG_FILENAME),
+ handleExceptions: true,
+ format: winston.format.combine(
+ winston.format.timestamp(),
+ jsonLoggerFormat
+ )
+}
+
+if (CONFIG.LOG.ROTATION.ENABLED) {
+ fileLoggerOptions.maxsize = CONFIG.LOG.ROTATION.MAX_FILE_SIZE
+ fileLoggerOptions.maxFiles = CONFIG.LOG.ROTATION.MAX_FILES
+}
+
+const logger = buildLogger()
+
+function buildLogger (labelSuffix?: string) {
+ return winston.createLogger({
+ level: CONFIG.LOG.LEVEL,
+ format: winston.format.combine(
+ labelFormatter(labelSuffix),
+ winston.format.splat()
+ ),
+ transports: [
+ new winston.transports.File(fileLoggerOptions),
+ new winston.transports.Console({
+ handleExceptions: true,
+ format: winston.format.combine(
+ timestampFormatter,
+ winston.format.colorize(),
+ consoleLoggerFormat
+ )
+ })
+ ],
+ exitOnError: true
+ })
+}
+
+function bunyanLogFactory (level: string) {
+ return function () {
+ let meta = null
+ let args: any[] = []
+ args.concat(arguments)
+
+ if (arguments[0] instanceof Error) {
+ meta = arguments[0].toString()
+ args = Array.prototype.slice.call(arguments, 1)
+ args.push(meta)
+ } else if (typeof (args[0]) !== 'string') {
+ meta = arguments[0]
+ args = Array.prototype.slice.call(arguments, 1)
+ args.push(meta)
+ }
+
+ logger[level].apply(logger, args)
+ }
+}
+
+const bunyanLogger = {
+ trace: bunyanLogFactory('debug'),
+ debug: bunyanLogFactory('debug'),
+ info: bunyanLogFactory('info'),
+ warn: bunyanLogFactory('warn'),
+ error: bunyanLogFactory('error'),
+ fatal: bunyanLogFactory('error')
+}
+
+function loggerTagsFactory (...defaultTags: string[]) {
+ return (...tags: string[]) => {
+ return { tags: defaultTags.concat(tags) }
+ }
+}
+