chamesu/packages/backend/api-core/src/modules/redis/store.ts

This package contains all packages of the chat application.

/*
 * Copyright (c) 2022.
 * Author Peter Placzek (tada5hi)
 * For the full copyright and license information,
 * view the LICENSE file that was distributed with this source code.
 */

import {RedisClientInterface} from "./index";

class RedisStore {
    protected subscriptions : {
        [key: string] : CallableFunction[]
    }
    constructor(protected redisSub: RedisClientInterface, protected redisPub: RedisClientInterface) {
    }

    public on(channel: string, cb: CallableFunction) : void {
        if(!this.subscriptions.hasOwnProperty(channel)) {
            this.subscriptions[channel] = [];
        }

        this.subscriptions[channel].push(cb);

        this.redisSub.subscribe(channel).then(() => {
            this.redisSub.on('message', this.onMessageEvent);
        });
    }

    protected onMessageEvent(channel: string, data: any) : void {
        if(this.subscriptions.hasOwnProperty(channel)) {
            const subscriptionsCount : number = this.subscriptions[channel].length;

            for(let i=0; i< subscriptionsCount; i++) {
                this.subscriptions[channel][i](data);
            }
        }
    }

    public async emit(channel: string, data: any) : Promise<boolean> {
        return await this.redisPub.publish(channel, data) === 1;
    }
}

type RedisStoreContext = {
    redisSub: RedisClientInterface,
    redisPub: RedisClientInterface
}

export default function createRedisStore({redisSub, redisPub} : RedisStoreContext) {
    const redisStore = new RedisStore(redisSub, redisPub);
}