[英]How do I set custom error log format in winston
winston 錯誤日志的默認格式太大,它包含許多內容,如date,process,memoryUsage,os,trace
等。
如何從日志中刪除不需要的東西?
日志記錄.js
const express = require('express');
const winston = require('winston');
module.exports = function() {
winston.handleExceptions(
new winston.transports.File({ filename: 'uncaughtExceptions.log' }));
process.on('unhandledRejection', (ex) => {
throw ex;
});
winston.add(winston.transports.File, { filename: 'request.log' });
}
服務器.js
const express = require('express');
const winston = require("winston");
const app = express();
//to Log errors
require('./startup/logging')();
//routes will contains all the routes list
require('./startup/routes')(app);
//PORT
const port = process.env.PORT || 3000;
app.listen(port,() => winston.info(`Listening on port ${port}....`));
路由.js
const express = require('express');
module.exports = function(app){
app.get('/', async (req, res) => {
res.json("testing"+a);
});
});
上面的路線有像未定義變量 'a' 這樣的錯誤,我可以記錄,但文件名和行號是錯誤的。
未捕獲的異常.log
{"date":"Wed Oct 31 2018 16:45:33 GMT+0530 (India Standard Time)","process":{"pid":9680,"uid":null,"gid":null,"cwd":"D:\\nodejs\\synchronizer","execPath":"C:\\Program Files\\nodejs\\node.exe","version":"v8.11.2","argv":["C:\\Program Files\\nodejs\\node.exe","D:\\nodejs\\synchronizer\\server.js"],"memoryUsage":{"rss":40591360,"heapTotal":23990272,"heapUsed":19075672,"external":18278915}},"os":{"loadavg":[0,0,0],"uptime":3474.217938},"trace":[{"column":28,"file":"D:\\nodejs\\synchronizer\\startup\\routes.js","function":"app.get","line":52,"method":"get","native":false},{"column":5,"file":"D:\\nodejs\\synchronizer\\node_modules\\express\\lib\\router\\layer.js","function":"Layer.handle [as handle_request]","line":95,"method":"handle [as handle_request]","native":false},{"column":13,"file":"D:\\nodejs\\synchronizer\\node_modules\\express\\lib\\router\\route.js","function":"next","line":137,"method":null,"native":false},{"column":3,"file":"D:\\nodejs\\synchronizer\\node_modules\\express\\lib\\router\\route.js","function":"Route.dispatch","line":112,"method":"dispatch","native":false},{"column":5,"file":"D:\\nodejs\\synchronizer\\node_modules\\express\\lib\\router\\layer.js","function":"Layer.handle [as handle_request]","line":95,"method":"handle [as handle_request]","native":false},{"column":22,"file":"D:\\nodejs\\synchronizer\\node_modules\\express\\lib\\router\\index.js","function":null,"line":281,"method":null,"native":false},{"column":12,"file":"D:\\nodejs\\synchronizer\\node_modules\\express\\lib\\router\\index.js","function":"Function.process_params","line":335,"method":"process_params","native":false},{"column":10,"file":"D:\\nodejs\\synchronizer\\node_modules\\express\\lib\\router\\index.js","function":"next","line":275,"method":null,"native":false},{"column":5,"file":"D:\\nodejs\\synchronizer\\middlewares\\reqreslog.js","function":"module.exports","line":12,"method":"exports","native":false},{"column":5,"file":"D:\\nodejs\\synchronizer\\node_modules\\express\\lib\\router\\layer.js","function":"Layer.handle [as handle_request]","line":95,"method":"handle [as handle_request]","native":false}],"stack":["ReferenceError: a is not defined"," at app.get (D:\\nodejs\\synchronizer\\startup\\routes.js:52:28)"," at Layer.handle [as handle_request] (D:\\nodejs\\synchronizer\\node_modules\\express\\lib\\router\\layer.js:95:5)"," at next (D:\\nodejs\\synchronizer\\node_modules\\express\\lib\\router\\route.js:137:13)"," at Route.dispatch (D:\\nodejs\\synchronizer\\node_modules\\express\\lib\\router\\route.js:112:3)"," at Layer.handle [as handle_request] (D:\\nodejs\\synchronizer\\node_modules\\express\\lib\\router\\layer.js:95:5)"," at D:\\nodejs\\synchronizer\\node_modules\\express\\lib\\router\\index.js:281:22"," at Function.process_params (D:\\nodejs\\synchronizer\\node_modules\\express\\lib\\router\\index.js:335:12)"," at next (D:\\nodejs\\synchronizer\\node_modules\\express\\lib\\router\\index.js:275:10)"," at module.exports (D:\\nodejs\\synchronizer\\middlewares\\reqreslog.js:12:5)"," at Layer.handle [as handle_request] (D:\\nodejs\\synchronizer\\node_modules\\express\\lib\\router\\layer.js:95:5)"],"level":"error","message":"uncaughtException: a is not defined","timestamp":"2018-10-31T11:15:33.714Z"}
問題是我如何記錄用戶定義的錯誤日志格式,例如:
timestamp:filename:errorlinenumber:errormessage:
上面的日志格式是默認的,其中包括不必要的東西。
您需要創建一個 winston格式化程序並從它提供的info
對象中提取相關字段。
這是解決方案:
記錄器.js
const express = require('express');
const { createLogger, format, transports } = require('winston');
const { combine, timestamp, label, printf } = format;
const myFormat = printf(info => {
return (info.timestamp + " | " +
info.trace[0].file + ":" + info.trace[0].line + " | " +
info.message.split("\n")[0]);
});
module.exports = function() {
const logger = createLogger({
format: combine(timestamp(), myFormat)
});
logger.exceptions.handle(new transports.File({ filename: 'uncaughtExceptions.log' }));
process.on('unhandledRejection', (reason, p) => {
throw reason;
});
}
輸出:
2018-11-01T13:42:54.927Z | /home/runner/routes.js:4 | uncaughtException: a is not defined
如果您只需要myFormat
console.log(info)
其他字段,請提取您需要的內容。 干杯!
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