NestJS GCP Logging: Seamlessly Integrate Google Cloud Platform Logging

Nest.js GCP Logger

Module Parameters

How to use

// app.module.ts
import { Module } from '@nestjs/common';
import { LoggingModule } from '@pzwik/nestjs-gcp-logger'; // <-- Import the module
import { AppController } from './app.controller';
import { AppService } from './app.service';

@Module({
  imports: [
    LoggingModule.forRoot({ // <-- Initialize the module
      gcpErrorReporting: false // default is 'false'
    })
  ],
  controllers: [AppController],
  providers: [AppService],
})
export class AppModule { }

// main.ts
import { NestFactory } from '@nestjs/core';
import { LoggingService } from '@pzwik/nestjs-gcp-logger'; // <-- Import here
import { AppModule } from './app.module';

async function bootstrap() {
  const app = await NestFactory.create(AppModule, { bufferLogs: true });
  app.useLogger(app.get(LoggingService));

  await app.listen(3000);
}
bootstrap();

import { Injectable, Logger } from '@nestjs/common'; // <-- Import Logger from Nest.js

@Injectable()
export class AppService {
  private readonly logger = new Logger('AppService');

  getHello(): string {
    this.logger.error('Some Error happened!'); // <-- Calls the logger
    // {"severity":"ERROR","message":"Some Error happened!"}
    return 'Hello World!';
  }
}

How to mock in tests

  // logger.mock.ts
  export class LoggerMock {
  log() {
    return;
  }
  error() {
    return;
  }
  warn() {
    return;
  }
  debug() {
    return;
  }
  verbose() {
    return;
  }
}

  // test.spec.ts
  const moduleFixture = await Test.createTestingModule({...})
    .overrideProvider(LoggingService)
    .useClass(LoggerMock)
    .compile();

  const app = moduleFixture.createNestApplication();

  // Do not forget to set the logger, otherwise nestjs default logger
  app.useLogger(app.get(LoggingService));
  
  await app.init();

Migrate 1.X -> 2.X

Update module creation

• from

LoggingModule.register()

• to

LoggingModule.forRoot()

Update name of param

• from

GCP_ERROR_REPORTING

• to

gcpErrorReporting

Update how logger passed to app

• from

const app = await NestFactory.create(AppModule, { logger: new LoggingService() });

• to

const app = await NestFactory.create(AppModule, { bufferLogs: true });
app.useLogger(app.get(LoggingService))

Update logger usage in services

• from

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

@Injectable()
export class AppService {
  getHello(): string {
    Logger.error('Some Error happened!');
    return 'Hello World!';
  }
}

• to

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

@Injectable()
export class AppService {
  private readonly logger = new Logger('AppService');

  getHello(): string {
    this.logger.error('Some Error happened!');
    return 'Hello World!';
  }
}

Download Details:

Author: mr-pascal
Source Code: https://github.com/mr-pascal/nestjs-gcp-logging 
License: ISC

#nestjs #gcp #log