# IORedis

# Features

Currently, @tsed/ioredis allows you:

Configure one or more Redis database connections via the @Configuration configuration.
Share redis connection with @tsed/platform-cache.
Support classic Redis connection and Cluster connection.
Inject connection to another service.
Mock connection for unit/integration test.

# Installation

npm install --save @tsed/ioredis ioredis
npm install --save-dev ioredis-mock

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Note

Minimal supported ioredis version is v5+

# Create connection

Create a new RedisConnection.ts file in your project:

import Redis from "ioredis";
import {registerConnectionProvider} from "@tsed/ioredis";

export const REDIS_CONNECTION = Symbol.for("REDIS_CONNECTION");
export type REDIS_CONNECTION = Redis;

registerConnectionProvider({
  provide: REDIS_CONNECTION,
  name: "default"
});

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Note

registerConnectionProvider create automatically an injectable RedisConnection.

Then, edit your Server.ts:

import {Configuration} from "@tsed/di";
import "@tsed/platform-cache"; // add this module if you want to use cache
import "@tsed/ioredis";

@Configuration({
  ioredis: [
    {
      name: "default",
      // share the redis connection with @tsed/platform-cache
      cache: true

      // redis options
      // host: "localhost",
      // port: 6379,
      // username: "...",
      // password: "...",
      // tls: false,
      // db: 0
    }
  ],
  // cache options
  cache: {
    ttl: 300
  }
})
class MyModule {}

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And finally, use the connection in your services:

import {Injectable} from "@tsed/di";

@Injectable()
export class ClientRepository {
  @Inject(REDIS_CONNECTION)
  protected connection: REDIS_CONNECTION; // ioredis instance

  async keys() {
    return this.connection.keys("clients:*");
  }
}

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See ioredis documentation (opens new window) for more details.

# Cluster configuration

import {Configuration} from "@tsed/di";
import "@tsed/platform-cache"; // add this module if you want to use cache
import "@tsed/ioredis";

@Configuration({
  ioredis: [
    {
      name: "default",
      // share the redis connection with @tsed/platform-cache
      cache: true,
      // cluster options
      nodes: ["..."],
      // other cluster options
      scaleReads: "all",
      maxRedirections: 16,
      retryDelayOnTryAgain: 100,
      retryDelayOnFailover: 200,
      retryDelayOnClusterDown: 1000,
      slotsRefreshTimeout: 15000,
      slotsRefreshInterval: 20000,
      enableOfflineQueue: true,
      enableReadyCheck: true,
      redisOptions: {
        noDelay: true,
        connectTimeout: 15000,
        autoResendUnfulfilledCommands: true,
        maxRetriesPerRequest: 5,
        enableAutoPipelining: true,
        autoPipeliningIgnoredCommands: ["scan"]
      }
      //
    }
  ],
  // cache options
  cache: {
    ttl: 300
  }
})
class MyModule {}

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# Testing

Ts.ED provides a utility that allows you to test a service that consumes a Redis connection. This use relies on the awesome ioredis-mock (opens new window) module.

Here is a class that consume a redis connection:

import {v4} from "uuid";
import {Injectable} from "@tsed/di";
import {serialize, deserialize} from "@tsed/json-mapper";
import {REDIS_CONNECTION} from "./RedisConnection";
import {ClientModel} from "./ClientModel";

@Injectable()
export class ClientRepository {
  @Inject(REDIS_CONNECTION)
  protected connection: REDIS_CONNECTION; // ioredis instance

  async get(id: string) {
    const raw = await this.connection.get("clients:" + id);

    if (!raw) {
      return undefined;
    }

    return deserialize(JSON.parse(raw), {type: ClientModel});
  }

  async save(client: ClientModel) {
    client.id = client.id || v4();

    this.connection.set("clients:" + client.id, JSON.stringify(serialize(client)));

    return client;
  }
}

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The ClientModel:

import {Schema} from "@tsed/schema";

export class ClientModel {
  @Property()
  id: string;

  @Property()
  name: string;
}

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And his test:

import {ClientRepository} from "./ClientRepository";
import {REDIS_CONNECTION} from "./RedisConnection";
import {ClientModel} from "./ClientModel";

describe("IORedisTest", () => {
  beforeEach(() => IORedisTest.create()); // create a new sandbox with ioredis-mock connection
  afterEach(() => IORedisTest.reset());

  it("should return nothing", async () => {
    const service = IORedisTest.get<MyRepository>(MyRepository);

    const client = await service.get("uid");

    expect(client).toEqual(undefined);
  });

  it("should return all keys", async () => {
    const service = IORedisTest.get<MyRepository>(MyRepository);
    const client = new ClientModel();
    client.name = "name";

    const newClient = await service.save(client);

    expect(newClient.id).toBeInstanceOf(String);
    expect(newClient.name).toEqual("name");

    const clientFound = await service.get(newClient.id);

    expect(clientFound).toBeInstanceOf(ClientModel);
    expect(clientFound.id).toEqual(newClient.id);
    expect(clientFound.name).toEqual("name");
  });
});

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