Nestjs redis cache example

README.md

Official Docs links:

https://docs.nestjs.com/techniques/caching

https://docs.nestjs.com/techniques/caching#different-stores

Also add types npm install --save-dev @types/cache-manager

http://localhost:3000

npm run start:dev

In CLI, redis client redis-cli

check by GET foo2

app.controller.ts

import { Controller, Get } from '@nestjs/common';
import { AppService } from './app.service';

@Controller()
export class AppController {
  constructor(private readonly appService: AppService) {}

  @Get()
  getHello(): Promise<string> {
    return this.appService.getHello();
  }
}

app.service.ts

import { Injectable, Inject, CACHE_MANAGER } from '@nestjs/common';
import { Cache } from 'cache-manager';

// https://stackoverflow.com/questions/55156379/how-to-control-cache-in-nestjs

@Injectable()
export class AppService {
  constructor(@Inject(CACHE_MANAGER) private cacheManager: Cache) {
  }

  async getHello(): Promise<string> {    
    // console.log(typeof this.cacheManager);
    // console.log(this.cacheManager);


    // callback way
    // this.cacheManager.set('foo', 'bar', {ttl: 100000}, (err) => {
    //   // console.log(err);
    //   this.cacheManager.get('foo', (err, result) => {
    //     // console.log('inner error', err);
    //     console.log(result);
    //   });
    // });

    // async/await way
    await this.cacheManager.set('foo2', 'bar2', {ttl: 100000});
    const res =  await this.cacheManager.get('foo2');
    console.log(res); // logs "bar2"

    return 'Hello World! 222';
  }
}

@SOHELAHMED7 Why did not you mention that how we should config it in our app.module.ts? I guess we have to configure it like this:

@Module({
    imports: [
        ConfigModule.forRoot({
            isGlobal: true,
            load: [configuration],
        }),
        CacheModule.register<RedisOptions>({
            isGlobal: true,
            store: redisStore,
            host: process.env.REDIS_HOST,
            port: +process.env.REDIS_PORT,
        })
    ],
    controllers: [AppController],
    providers: [AppService, AllHttpExceptionsFilter],
})
export class AppModule {}

TBH even I think this is not cache-manager configuration.

It is already present. Pleas see "Redis Cache" section after "Installing Dependencies" at https://sohelahmed.site/blog/redis-cache-in-nest-js