使用winston中的自定义格式化程序logging错误

我在winston中添加了一个自定义的格式化程序。 代码如下所示：

'use strict'; const winston = require('winston'); winston.transports.DailyRotateFile = require('winston-daily-rotate-file'); var timeStampFormat = "YYYY-MM-DDTHH:mm:ss.SSSZ"; var moment = require('moment'); function logTemplate(level, meta, message){ return "{" + "\"timestamp\" : \"" + moment().format(timeStampFormat) + "\" ," + "\"level\" : \"" + level + "\"," + meta + "\"content\" :" + message + "}"; } function formatter(args) { var message = ""; var metaString = ""; message = JSON.stringify(args.message); var reqId = "1212121211"; var metaString = "\"reqId\" : \"" + reqId + "\", "; console.dir(JSON.stringify(args)) return logTemplate(args.level, metaString, message); } class Logger { constructor(appName, stream, shouldConsole) { stream.formatter = formatter; this.logger = new winston.Logger({ level: stream.level, transports: [ new (winston.transports.Console)(), new (winston.transports.DailyRotateFile)(stream) ] }); this.logger.level = "silly"; this.logger.cli(); return this; } trace() { return this.logger.log("trace", arguments); } debug() { return this.logger.log("debug", arguments); } info() { return this.logger.log("info", arguments); } warn() { return this.logger.log("warn", arguments); } error() { return this.logger.log("error", arguments); } fatal() { return this.logger.log("fatal", arguments) } } exports = module.exports = Logger; 

我使用string或对象进行日志logging：

 var x = {}; xa = "Hello"; xb = "World"; log.info("Error Message Test", x); 

产量

 {"timestamp" : "2016-11-10T12:53:22.334+05:30" ,"level" : "info","reqId" : "1212121211", "content" :" { '0': 'Error Message Test', '1': { a: 'Hello', b: 'World' } }"} 

当我试图logging下面的Error对象时： –

 log.info(new Error("The error message")); 

输出： –

 {"timestamp" : "2016-11-10T03:43:47.613+05:30" ,"level" : "info","reqId" : "1212121211", "content" :" { '0': \n Error: The error message\n at Server.<anonymous> (/Users/debraj/code/github/jabong/JARVIS/server.js:91:15)\n at Server.g (events.js:286:16)\n at emitNone (events.js:86:13)\n at Server.emit (events.js:185:7)\n at emitListeningNT (net.js:1279:10)\n at _combinedTickCallback (internal/process/next_tick.js:71:11)\n at process._tickCallback (internal/process/next_tick.js:98:9)\n at Function.Module.runMain (module.js:577:11)\n at startup (node.js:160:18)\n at node.js:449:3\n }"} 

有人可以让我知道如何正确地loggingError对象格式化错误消息内部errMsg字段和堆栈跟踪里面的JSON日志使用Winston中的trace字段？

Answer 1

这个怎么样：

 const formatter = name => options => { let stack = ''; if (options.meta) { if(options.meta.stack) { stack += '\n' + options.meta.stack; options.meta.stack = undefined; } if(options.meta.errorStack) { if(stack !== '') { stack += '\n'; } stack += options.meta.errorStack; options.meta.errorStack = undefined; } } return timestamp() + ' - ' + name + ' - ' + formatLevel[options.level] + ' ' + (options.message ? JSON.stringify(options.message) : '') + (options.meta && Object.keys(options.meta).length ? '\n\t' + JSON.stringify(options.meta) : '' ) + stack; }; // config: { transports: [ new winston.transports.Console({... loggingConfig.console, formatter: formatter(name)}) ], exitOnError: false }