如何自定义nest.js记录器

Question

我想删除默认的日志格式，只使用自定义的日志消息。::1 2021-08-10T10:29:52.000Z PUT / http 200 18 3000 27ms我需要帮助创建自定义记录器，下面是我迄今为止的代码。它使用默认的日志格式[Nest] 28869 - 2021. 08. 10 10:23:03AM LOG ${custom log message}进行日志记录

@Injectable()
export class LoggingInterceptor implements NestInterceptor {
intercept(context: ExecutionContext, next) {
const now = Date.now();
const req = context.switchToHttp().getRequest();
const method = req.method;
const url = req.url;
return next.handle().pipe(
tap(() => {
const res = context.switchToHttp().getResponse();
const delay = Date.now() - now;
Logger.log(
`${req.ip} ${new Date()} ${method} ${url} ${req.protocol} ${res.statusCode} ${
req.headers['content-length'] || '0'
} ${req.headers.host.split(':')[1]} ${delay}ms`,
);
}),
);
}
}

提前谢谢！

Answer 1

您可以通过覆盖默认记录器并在应用程序在main.ts.中引导时使用该记录器来实现这一点

你的自定义记录器是这样的。

import { LoggerService } from '@nestjs/common';
export class CustomLogger implements LoggerService {
/**
* Write a 'log' level log.
*/
log(message: any, ...optionalParams: any[]) {
console.log(message);
}
/**
* Write an 'error' level log.
*/
error(message: any, ...optionalParams: any[]) {}
/**
* Write a 'warn' level log.
*/
warn(message: any, ...optionalParams: any[]) {}
/**
* Write a 'debug' level log.
*/
debug?(message: any, ...optionalParams: any[]) {}
/**
* Write a 'verbose' level log.
*/
verbose?(message: any, ...optionalParams: any[]) {}
}

然后创建一个模块，并将客户记录器提供给该模块。并使其具有全局性，这样您就可以在代码的任何位置使用它。

import { Module, Global } from '@nestjs/common';
import { CustomLogger } from './logger.service';
import { LoggingInterceptor } from './logging.interceptor';
@Global()
@Module({
providers: [CustomLogger, LoggingInterceptor],
exports: [CustomLogger],
})
export class LoggerModule {
}

在AppModule中注册LoggerMoodle。将客户记录器添加到您的主.ts.

import { CustomLogger } from './logger/logger.service';
import { NestFactory } from '@nestjs/core';
import { AppModule } from './app.module';
async function bootstrap() {
const app = await NestFactory.create(AppModule, {
bufferLogs: true,
});
app.useLogger(app.get(CustomLogger));
await app.listen(PORT)
}

然后，您可以将customerLogger服务注入到Logging拦截器中，您的工作就完成了。

import { CustomLogger } from './logger.service';
@Injectable()
export class LoggingInterceptor implements NestInterceptor {
constructor(private customLogger: CustomLogger) {}
intercept(context: ExecutionContext, next) {
const now = Date.now();
const req = context.switchToHttp().getRequest();
const method = req.method;
const url = req.url;
return next.handle().pipe(
tap(() => {
const res = context.switchToHttp().getResponse();
const delay = Date.now() - now;
this.customLogger.log(
`${req.ip} ${new Date()} ${method} ${url} ${req.protocol} ${res.statusCode} ${
req.headers['content-length'] || '0'
} ${req.headers.host.split(':')[1]} ${delay}ms`,
);
}),
);
}
}