nestjs使用redis

redis安装

1、windows安装，下载目录：Releases · microsoftarchive/redis · GitHub，解压，打开redis-server.exe，开启redis服务

2、linux安装

// 查看系统是否安装redis
yum info redis
 
// 如果没有安装，执行以下步骤
// 安装epel库
yum install epel-release -y
// 安装redis
yum install redis -y
 
// 操作
启动：systemctl start redis
重启：systemctl restart redis
关闭：systemctl stop redis
 
// 设置开机启动
systemctl enable redis

3、mac安装

brew install redis

brew services start redis

redis-server /usr/local/etc/redis.conf

使用redis

安装依赖 @nestjs/microservices 和 ioredis

npm i @nestjs/microservices ioredis -S

新建 redis-cache.module.ts

推荐使用命令： nest g mo redis-cache

import { Module } from '@nestjs/common';
import { Transport, ClientsModule } from '@nestjs/microservices';
import { Redis } from 'ioredis';
import { RedisCacheService } from './redis-cache.service';

@Module({
  imports: [
    // 初始化redis，redis参数建议配置到外部配置文件引入
    ClientsModule.register([
      {
        name: 'MATH_SERVICE',
        transport: Transport.REDIS,
        options: {
          host: 'redis://localhost:6379',
        }
      }
    ]),
  ],
  providers: [RedisCacheService, Redis],
  exports: [RedisCacheService]
})

export class RedisCacheModule {}

新建 redis-cache.service.ts

推荐使用命令： nest g s redis-cache

import { Injectable } from '@nestjs/common';
import { Redis } from 'ioredis';

@Injectable()
export class RedisCacheService {
  constructor(private readonly redis: Redis) {}

  // 获取redis
  async get(key) {
    const res = await this.redis.get(key);
    return JSON.parse(res);
  }

  // 设置redis
  async set(key, value) {
    return await this.redis.set(key, JSON.stringify(value));
  }
}

在需要使用的场景，引入以上两个文件即可

app.module.ts

...
import { RedisCacheModule } from './redis-cache/redis-cache.module';

@Module({
  imports: [
    RedisCacheModule,
  ],
  ...
})
export class AppModule {}

app.service.ts

import { Injectable } from '@nestjs/common';
import { RedisCacheService } from './redis-cache/redis-cache.service';

@Injectable()
export class AppService {
  constructor(private readonly redisCacheService: RedisCacheService) {}

  getCache(param):any {
    return this.redisCacheService.get(param.key);
  }

  setCache(param):any {
    return this.redisCacheService.set(param.key, param.value);
  }
}