access request ID outside middleware

[zainkhan10]

Actually, I'm saving activity logs in my database and I also want to save the associated "reqId" so I can track down problems later if any arise. I need to access the log request ID outside the logger.log function. I also mentioned the scenario below:

app.module.ts

@Module({
  imports: [
    LoggerModule.forRoot({
      pinoHttp: {
        genReqId: (req: any) => {
          return req.headers.req_id || uuid();
        },
        base: undefined,
        quietReqLogger: true,
        timestamp: false,
      },
    }),
  ],
})
export class AppModule {}

app.service.ts

import { Injectable, Logger } from '@nestjs/common';

@Injectable()
export class MyService {
  private readonly logger = new Logger(MyService.name);

  async saveActivity() {
     this.logger.log("saving user activity"); // this will print the log with reqId
     // saving user activity in the DB
     await userActivityRepo.save({ ...rest, request_id: ?? }); // I want to above log reqId in request_id column while saving activity
  }
}

[hliang]

Not sure if you've found the solution yet, but you can try this.logger.bindings(), which should return an object including reqId: "xxx".

[tanner-sika]

Thanks @hliang I was able to resolve this based on your comment. In order to get it to work, instead of using the Logger from '@nestjs/common'; I had to instead follow the instructions on using the PinoLogger:

constructor(
    private readonly logger: PinoLogger,
  ) {
    this.logger.setContext(RequestLoggerInterceptor.name);
  }
  async myFunc() {
    const requestId = this.logger?.logger?.bindings()?.req?.id;
}

and I was able to control the req.id in the initial injection of the logger in the app.module.ts (docs for genReqId)

 LoggerModule.forRootAsync({
      inject: [ConfigService],
      useFactory: async (configService: ConfigService) => ({
        pinoHttp: {
          genReqId: function (req, res) {
            const existingID = req.id ?? req.headers['x-request-id'];
            if (existingID) return existingID;
            console.log(`found an id: ${existingID}`);
            const id = uuidv4();
            res.setHeader('X-Request-Id', id);
            console.log(`created an id: ${id}`);
            return id;
          },
          ...otherConfig
        },
      }),
    }),