Question 121354 in Redis Question posted in
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In Nest js, I added Redis as a cache manager. And can't find any added data in Redis after calling the set function. So, am I missing something?

Node version: v14.15.4
Nest-js version: 9.0.0

app.module.ts
Here is the code.
In the app module, I am registering Redis as a cache manager.

@Module({
  imports: [
    CacheModule.register({
      isGlobal: true,
      store: redisStore,
      url: process.env.REDIS_URL,
    })
  ],
  controllers: [AppController],
  providers: [AppService],
})
export class AppModule {}

service.ts
The cache data method is for storing data with a key. -> the problem is the set function doesn’t save anything

And get Data for returning the data by key.

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

      async cacheData(key: string, data): Promise<void> {
        await this.cacheManager.set(key, data);
      }

      async getData(key: string, data): Promise<any> {
        return this.cacheManager.get(key);
      }
}

It doesn’t throw any error in runtime.

Tags:

6

Answers


  1. 0

    I am not sure why your getData function returns Promise<void> have you tried returning Promise<any> or the data type you are expecting e.g. Promise<string>. You could also try adding await.

     async getData(key: string, data): Promise<any> {
    return await this.cacheManager.get(key);
 }

    Are you sure that you are connecting to redis successfully ?. Have you tried adding password and tls (true/false) configuration ?

    @Module({
  imports: [
    CacheModule.register({
      isGlobal: true,
      store: redisStore,
      url: process.env.REDIS_URL,
      password: process.env.REDIS_PASSWORD,
      tls: process.env.REDIS_TLS
    })
  ],
  controllers: [AppController],
  providers: [AppService],
})
export class AppModule {}
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  2. 0

    The default expiration time of the cache is 5 seconds.

    To disable expiration of the cache, set the ttl configuration property to 0:

    await this.cacheManager.set('key', 'value', { ttl: 0 });
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  3. 0

    i has met the same problem as you,the way to fix this is using the install cmd to change the version of cache-manager-redis-store to 2.0.0 like ‘npm i [email protected]’

    when you finish this step, the use of redisStore can be found,then the database can be linked.

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  4. 0

    I had the same problem.

    It looks like NestJS v9 incompatible with version 5 of cache-manager. So you need to downgrade to v4 for now, until this issue is resolved: https://github.com/node-cache-manager/node-cache-manager/issues/210

    Change your package.json to have this in the dependencies:

    "cache-manager": "^4.0.0",`

    Another commenter also suggested lowering the redis cache version.

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  5. 0

    Set the redis store as redisStore.redisStore (You will get an autocomplete)

    CacheModule.register({
  isGlobal: true,
  store: redisStore.redisStore,
  url: process.env.REDIS_URL,
})
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  6. 0

    My stack:

    redis.service.ts:

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

@Injectable()
export class RedisService {
  constructor(
    @Inject(CACHE_MANAGER)
    private cacheManager: Cache,
  ) {}
  async set(key: string, value: unknown): Promise<void> {
    try {
      await this.cacheManager.set(key, value, 0);
    } catch (error) {
      throw new InternalServerErrorException();
    }
  }

  async get(key: string): Promise<unknown> {
    try {
      return await this.cacheManager.get(key);
    } catch (error) {
      throw new InternalServerErrorException();
    }
  }
}

    redis.module.ts:

    import { CacheModule, Module } from '@nestjs/common';
import type { RedisClientOptions } from 'redis';
import { redisStore } from 'cache-manager-redis-yet';

import {
  REDIS_HOST,
  REDIS_PORT,
} from 'libs/config';
import { RedisService } from './redis.service';

@Module({
  imports: [
    CacheModule.register<RedisClientOptions>({
      isGlobal: true,
      store: redisStore,
      url: `redis://${REDIS_HOST}:${REDIS_PORT}`,
    }),
  ],
  providers: [RedisService],
  exports: [RedisService],
})
export class RedisModule {}

    This code works fine for me.

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