![[NestJS] 캐싱](/images/nestjs_practice_logo.png){kind=logo}
Table of Contents
- Nest의 인터셉터는 요청을 가로채어 캐싱된 응답이 있는지 확인하고, 있다면 캐시된 데이터를 바로 반환하며, 없을 경우에만 컨트롤러의 코드를 실행하게 하는 구조로 동작할 수 있다
- 이를 통해 불필요한 로직 실행을 방지하고 성능을 향상시킬 수 있습니다
// // src/caching/caching.module.ts
import { Global, Module } from '@nestjs/common';
import { CachingService } from './caching.service';
@Global()
@Module({
providers: [CachingService],
exports: [CachingService],
})
export class CachingModule {}
// src/caching/caching.service.ts
import { Injectable } from '@nestjs/common';
import Redis from 'ioredis';
import { ConfigService } from '@nestjs/config';
@Injectable()
export class CachingService {
private readonly redis: any;
constructor(private readonly configService: ConfigService) {
this.redis = new Redis({
host: this.configService.get<string>('REDIS_HOST'),
port: this.configService.get<number>('REDIS_PORT'),
});
}
async get(key: string) {
return await this.redis.get(key);
}
async set(key: string, value: any) {
return await this.redis.set(key, value);
}
}
// src/caching/caching.interceptor.ts
import { CallHandler, ExecutionContext, Injectable, NestInterceptor } from '@nestjs/common';
import { Observable, of, tap } from 'rxjs';
import { CachingService } from './caching.service';
@Injectable()
export class CachingInterceptor implements NestInterceptor {
constructor(private readonly cachingService: CachingService) {}
async intercept(context: ExecutionContext, next: CallHandler<any>): Promise<Observable<any>> {
const req = context.switchToHttp().getRequest();
const cachedData = await this.cachingService.get('foo');
if (cachedData) {
console.log('캐시 있음 -> 캐시 데이터 불러옴');
return of(JSON.stringify(cachedData));
} else {
console.log('캐시 없음 -> 결과물 캐싱하고 결과 불러옴');
return next.handle().pipe(
tap(async (response) => {
await this.cachingService.set('foo', JSON.stringify(response));
}),
);
}
}
}