可能这会帮助希望记录响应的人因此，我们使用中间件在将请求提供给客户端之前拦截请求。然后，如果我们使用 res.send 方法发送数据，请覆盖中间件中的方法并确保控制台记录正文。如果您打算单独使用 res.send，那么这应该可以正常工作，但是如果您使用 res.end 或 res.sendFile，则覆盖这些方法并仅记录所需的内容（显然，不应该记录整个八位位组文件流出于性能目的而记录。
在这里，我使用 pino 作为记录器。将其创建为单例服务。
// LoggingResponseRouter.js
var loggingResponseRouter = require('express').Router();
var loggingService = require('./../service/loggingService');
var appMethodInstance = require('./../constants/appMethod');
var path = require('path');
var fs = require('fs');
var timeZone = require('moment-timezone');
var pino = require('pino')();
loggingResponseRouter.use((req, res, next) => {
// set the fileName it needs to log
appMethodInstance.setFileName(__filename.substring(__filename.lastIndexOf(path.sep) + 1, __filename.length - 3));
//loggingService.debugAndInfolog().info('logging response body', appMethodInstance.getFileName());
let send = res.send;
res.send = function(body){
loggingService.debugAndInfolog().info('Response body before sending: ', body);
send.call(this, body);
}
next();
});
module.exports = loggingResponseRouter;
主文件 - Main.js
const corsRouter = require('./app/modules/shared/router/corsRouter');
const logRequestRouter = require('./app/modules/shared/router/loggingRequestRouter');
const loggingResponseRouter = require('./app/modules/shared/router/loggingResponseRouter');
const express = require('express');
var path = require('path');
const app = express();
// define bodyparser middleware
const bodyParser = require('body-parser');
const port = process.env.PORT || 3000;
// Now use the middleware prior to any others
app.use(bodyParser.json());
// use this to read url form encoded values as wwell
app.use(bodyParser.urlencoded({extended:true}));
console.log('before calling cors router in main js');
app.use(corsRouter);
app.use(logRequestRouter);
app.use(loggingResponseRouter);
app.get('/api', (req, res) => {
console.log('inside api call');
res.send('aapi');
});
app.listen(port, () => {
console.log('starting the server');
});
这是 loggingService - loggingService.js
var pino = require('pino');
var os = require('os');
var appMethodInstance = require('./../constants/appMethod');
var pinoPretty = require('pino-pretty');
var moment = require('moment');
var timeZone = require('moment-timezone');
class Logger{
constructor(){
this.appName = 'Feedback-backend';
this.filenameval = '';
}
getFileName(){
console.log('inside get filename');
console.log(appMethodInstance.getFileName());
if(appMethodInstance.getFileName() === null || appMethodInstance.getFileName() === undefined){
this.filenameval = 'bootstrapping...'
}else {
this.filenameval = appMethodInstance.getFileName();
}
console.log('end');
return this.filenameval;
}
debugAndInfolog(){
return pino({
name: 'feedback-backend',
base: {
pid: process.pid,
fileName: this.getFileName(),
moduleName: 'modulename',
timestamp: timeZone().tz('America/New_York').format('YYYY-MM-DD HH:mm:ss.ms'),
hostName: os.hostname()
},
level: 'info',
timestamp: timeZone().tz('America/New_York').format('YYYY-MM-DD HH:mm:ss.ms'),
messageKey: 'logMessage',
prettyPrint: {
messageKey: 'logMessage'
}
});
}
errorAndFatalLog(){
return pino({
name: 'feedback-backend',
base: {
pid: process.pid,
fileName: this.getFileName(),
moduleName: 'modulename',
timestamp: timeZone().tz('America/New_York').format('YYYY-MM-DD HH:mm:ss.ms'),
hostName: os.hostname()
},
level: 'error',
timestamp: timeZone().tz('America/New_York').format('YYYY-MM-DD HH:mm:ss.ms'),
prettyPrint: {
messageKey: 'FeedbackApp'
}
});
}
}
module.exports = new Logger();
