io-syncify/src/RedisOutputMessageReceiver.ts

跨进程、跨服务器之间通信同步化

import {EventEmitter} from "events";
import * as IORedis from "ioredis";

import {Message} from "./Message";
import {OutputMessageReceiver} from "./OutputMessageReceiver";

/**
 * Redis输出消息接收器
 */
export class RedisOutputMessageReceiver implements OutputMessageReceiver {
    /**
     * 事件发射器
     */
    eventEmitter: EventEmitter;
    /**
     * 输出消息订阅通道
     */
    output_message_sub_channel: string
    /**
     * 输出消息订阅客户端
     */
    output_message_sub_client: IORedis.Redis;

    /**
     *
     * @param {string} output_message_sub_channel
     * @param {IORedis.RedisOptions} options
     * @param {EventEmitter} emitter
     */
    constructor(output_message_sub_channel: string, options: IORedis.RedisOptions, emitter: EventEmitter) {
        this.output_message_sub_channel = output_message_sub_channel;
        this.output_message_sub_client = new IORedis(options);
        this.eventEmitter = emitter;
    }

    /**
     * 接收消息
     */
    receive() {
        this.output_message_sub_client.subscribe(this.output_message_sub_channel).then(()=>{
            // console.log('subscribe', this.output_message_sub_channel, 'success');
            this.output_message_sub_client.on('message', async (channel, message) => {
                // console.log(Date.now(), 'receive output message', message);
                let msg = Message.fromJsonArrayString(message);
                this.eventEmitter.emit(msg.id, msg);
            });
        });
    }
}