`@betsys-nestjs/http-client`

This is a simple wrapper module built around @nestjs/axios.

Dependencies

Package	Version
@nestjs/common	^10.0.0
@nestjs/core	^10.0.0
reflect-metadata	<1.0.0
rxjs	^7.0.0
@nestjs/axios	^3.0.0
axios	^1.0.0

Usage

The basic usage is similar to the @nestjs/axios module. You use the HttpClientService to make HTTP requests.

@Injectable()
export class CatsService {
  constructor(private httpService: HttpClientService) {}

  findAll(): Observable<AxiosResponse<Cat[]>> {
    return this.httpService.get('http://localhost:3000/cats');
  }
}

You need to import HttpClient module to use the HttpClientService. Both register and registerAsync are available:

@Module({
  imports: [
    HttpModule.register({
      timeout: 5000,
      maxRedirects: 5,
    }),
  ],
  providers: [CatsService],
})
export class CatsModule {}

Monitoring and Logger support

The library is ready to work with monitoring and logger. To enable it you need to implement your own monitoring and logger service based on abstraction provided by this library.

Time monitoring - used for monitoring of request time, your provided service must implement HttpClientTimeMonitoringInterface. Implementation of startTimerHttpRequestTime starts your custom timer returning a function which stops the timer.

Example of time monitoring using @betsys-nestjs/monitoring:

import { Injectable } from '@nestjs/common';
import {
    Histogram,
    InjectMonitoringConfig,
    InjectMonitoringRegistry,
    MonitoringConfig,
    Registry,
    AbstractMonitoringService, exponentialBuckets,
} from '@betsys-nestjs/monitoring';

@Injectable()
export class MonitoringService extends AbstractMonitoringService {
    private readonly requestTime: Histogram<string>;

    constructor(
        @InjectMonitoringConfig() private readonly config: MonitoringConfig,
        @InjectMonitoringRegistry() protected readonly registry: Registry,
    ) {
        super(registry);

        this.requestTime = this.createMetric(Histogram, {
            name: config.getMetricsName('http_client'),
            help: 'Histogram of http request times',
            buckets: exponentialBuckets(0.001, 2, 20),
            labelNames: ['url', 'statusCode', 'api'],
            registers: [registry],
        });
    }

    startTimerHttpRequestTime(url: string): ({ statusCode }: { statusCode: number }) => number {
        return this.requestTime.startTimer({ url, api: 'api/v1/test' });
    }
}

Logger

Similar to monitoring you can simply implement custom service following HttpClientLoggerInterface.

In additional to params accepted by @nestjs/axios module, you can define if logging should be enabled, and you can choose from two logging levels:

HttpClientLogLevel.Info, logs basic request and response information
HttpClientLogLevel.Full, logs detailed request and response information (including headers, body, etc.)

To start using Logger or Monitoring service, you simply insert class references to register or registerAsync method of HttpClientModule like this:

import { HttpClientModule } from '@betsys-nestjs/http-client';
import { Logger } from '@betsys-nestjs/logger';
import { MonitoringService } from '...'; // the path to the monitoring service implementation

@Module({
  imports: [
    HttpClientModule.register({
      log: true, // default true
      logLevel: HttpClientLogLevel.Info, // default 'HttpClientLogLevel.Info'
      logger: Logger,
      monitoring: MonitoringService,
    }),
  ],
  providers: [CatsService],
})
export class CatsModule {}