@daiso-tech/core
Version:
The library offers flexible, framework-agnostic solutions for modern web applications, built on adaptable components that integrate seamlessly with popular frameworks like Next Js.
63 lines • 2.59 kB
JavaScript
/**
* @module EventBus
*/
import { EventEmitter } from "node:events";
import {} from "ioredis";
import {} from "../../../../event-bus/contracts/_module.js";
import {} from "../../../../serde/contracts/_module.js";
import {
// eslint-disable-next-line @typescript-eslint/no-unused-vars
SuperJsonSerdeAdapter, } from "../../../../serde/implementations/adapters/_module.js";
/**
* To utilize the `RedisPubSubEventBusAdapter`, you must install the [`"ioredis"`](https://www.npmjs.com/package/ioredis) package and supply a {@link ISerde | `ISerde<string>`}, with a {@link SuperJsonSerdeAdapter | `SuperJsonSerdeAdapter `}.
*
* IMPORT_PATH: `"@daiso-tech/core/event-bus/redis-pub-sub-event-bus-adapter"`
* @group Adapters
*/
export class RedisPubSubEventBusAdapter {
serde;
dispatcherClient;
listenerClient;
eventEmitter = new EventEmitter();
/**
* @example
* ```ts
* import { RedisPubSubEventBusAdapter } from "@daiso-tech/core/event-bus/redis-pub-sub-event-bus-adapter";
* import { Serde } from "@daiso-tech/core/serde";
* import { SuperJsonSerdeAdapter } from "@daiso-tech/core/serde/super-json-serde-adapter"
* import Redis from "ioredis";
*
* const client = new Redis("YOUR_REDIS_CONNECTION_STRING");
* const serde = new Serde(new SuperJsonSerdeAdapter());
* const eventBusAdapter = new RedisPubSubEventBusAdapter({
* client,
* serde,
* });
* ```
*/
constructor(settings) {
const { client, serde } = settings;
this.dispatcherClient = client;
this.listenerClient = client.duplicate();
this.serde = serde;
}
redisListener = (channel, message) => {
this.eventEmitter.emit(channel, this.serde.deserialize(message));
};
async addListener(eventName, listener) {
// eslint-disable-next-line @typescript-eslint/no-misused-promises
this.eventEmitter.on(eventName, listener);
await this.listenerClient.subscribe(eventName);
// eslint-disable-next-line @typescript-eslint/no-misused-promises
this.listenerClient.on("message", this.redisListener);
}
async removeListener(eventName, listener) {
// eslint-disable-next-line @typescript-eslint/no-misused-promises
this.eventEmitter.off(eventName, listener);
await this.listenerClient.unsubscribe(eventName);
}
async dispatch(eventName, eventData) {
await this.dispatcherClient.publish(eventName, this.serde.serialize(eventData));
}
}
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