+// Use object for better performances (~ O(1))
+const excludedKeys = {
+ level: true,
+ message: true,
+ splat: true,
+ timestamp: true,
+ label: true
+}
+function keysExcluder (key, value) {
+ if (excludedKeys[key] === true) return undefined
+
+ if (key === 'err') return value.stack
+
+ return value
+}
+
+const consoleLoggerFormat = winston.format.printf(info => {
+ let additionalInfos = JSON.stringify(info, keysExcluder, 2)
+ if (additionalInfos === '{}') additionalInfos = ''
+ else additionalInfos = ' ' + additionalInfos
+
+ if (info.message && info.message.stack !== undefined) info.message = info.message.stack
+ return `[${info.label}] ${info.timestamp} ${info.level}: ${info.message}${additionalInfos}`
+})
+
+const jsonLoggerFormat = winston.format.printf(infoArg => {
+ let info = infoArg.err
+ ? Object.assign({}, infoArg, { err: infoArg.err.stack })
+ : infoArg
+
+ if (infoArg.message && infoArg.message.stack !== undefined) {
+ info = Object.assign({}, info, { message: infoArg.message.stack })
+ }
+
+ return JSON.stringify(info)
+})
+
+const timestampFormatter = winston.format.timestamp({
+ format: 'YYYY-MM-DD HH:mm:ss.SSS'
+})
+const labelFormatter = winston.format.label({
+ label
+})
+
+const logger = new winston.createLogger({
+ level: CONFIG.LOG.LEVEL,