我正在使用 NestJS 5.4.0
我有自定义 LoggerService,它运行良好。但是,如何将此 LoggerService 添加到 ExceptionFilter。
// logger.service.ts
import {Injectable, LoggerService} from '@nestjs/common';
@Injectable()
export class Logger implements LoggerService {
log(message: string) {
console.log(message);
}
error(message: string, trace: string) {
console.error(message);
}
warn(message: string) {
console.warn(message);
}
}
//logger.module.ts
import { Module } from '@nestjs/common';
import {Logger} from '../services/logger.service';
@Module({
providers: [Logger],
exports: [Logger],
})
export class LoggerModule {}
// user.module.ts
import { Module } from '@nestjs/common';
import {UserService} from '../services/user.service';
import {LoggerModule} from './logger.module';
@Module({
imports: [LoggerModule],
providers: [UserService],
exports: [UserService],
})
export class UserModule {}
它运行良好。
import {Logger} from './logger.service';
export class UserService {
constructor(
private logger: Logger
) {}
private test = () => {
this.logger.log("test"); // log success "test" to console
}
}
但是如何将我的自定义 Logger 添加到 ExceptionFilter
// forbidden.exception.filter.ts
import {HttpException, HttpStatus, Injectable} from '@nestjs/common';
@Injectable()
export class ForbiddenException extends HttpException {
constructor(message?: string) {
super(message || 'Forbidden', HttpStatus.FORBIDDEN);
// I want to add my custom logger here!
}
}
感谢阅读。
最佳答案
首先你的class ForbiddenException extends HttpException
不是
它叫什么ExceptionFilter
. ExceptionFilter
是
exceptions layer which is responsible for processing all unhandled exceptions across an application
docs
当您尝试将其注入(inject)自定义
HttpException
时,您提供了示例.但那是错误的。您的异常不必负责记录。就是这样 ExceptionFilter
应该负责。 无论如何,目前(2019 年 10 月 17 日)官方文档中没有示例如何将提供程序注入(inject)
ExceptionFilter
.您可以将其传递给
constructor
在初始化时,但您应该先使用 app.get<T>(...)
获取 Logger 实例方法。 例如,我从 exception-filters docs 更改了代码:
// HttpExceptionFilter.ts
import { ExceptionFilter, Catch, ArgumentsHost, HttpException } from '@nestjs/common';
import { Request, Response } from 'express';
import {MyLogger} from '../MyLogger'
@Catch(HttpException)
export class HttpExceptionFilter implements ExceptionFilter {
constructor(private readonly logger: MyLogger) {}
catch(exception: HttpException, host: ArgumentsHost) {
const ctx = host.switchToHttp();
const response = ctx.getResponse<Response>();
const request = ctx.getRequest<Request>();
const status = exception.getStatus();
if (status >= 500) {
this.logger.error({ request, response });
}
response
.status(status)
.json({
statusCode: status,
timestamp: new Date().toISOString(),
path: request.url,
});
}
}
和
bootstrap.ts
代码:// bootstrap.ts
const app = await NestFactory.create(MainModule, {
logger: false,
});
const logger = app.get<MyLogger>(MyLogger);
app.useLogger(logger);
app.useGlobalFilters(new HttpExceptionFilter(logger));
此技术可用于所有这些
INestApplication
方法:关于node.js - NestJS 如何将自定义 Logger 添加到自定义 ExceptionFilter,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/53394758/