65 lines
1.7 KiB
TypeScript
65 lines
1.7 KiB
TypeScript
import type { RedisConnector } from '@sammo-ts/infra';
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import type { RealtimeEvent } from '@sammo-ts/common';
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export type RealtimeListener = (event: RealtimeEvent) => void;
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export const parseRealtimeEvent = (message: string): RealtimeEvent | null => {
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if (!message) {
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return null;
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}
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try {
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const parsed = JSON.parse(message) as RealtimeEvent;
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if (!parsed || typeof parsed !== 'object') {
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return null;
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}
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if (typeof parsed.type !== 'string') {
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return null;
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}
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return parsed;
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} catch {
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return null;
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}
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};
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// Redis pub/sub 이벤트를 SSE 구독자에게 전달하는 중계 허브.
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export class RedisRealtimeEventHub {
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private readonly listeners = new Set<RealtimeListener>();
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private subscribed = false;
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constructor(
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private readonly redis: RedisConnector['client'],
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private readonly channel: string
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) {}
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async start(): Promise<void> {
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if (this.subscribed) {
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return;
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}
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await this.redis.subscribe(this.channel, (message) => {
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const event = parseRealtimeEvent(message);
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if (!event) {
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return;
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}
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for (const listener of this.listeners) {
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listener(event);
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}
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});
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this.subscribed = true;
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}
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subscribe(listener: RealtimeListener): () => void {
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this.listeners.add(listener);
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return () => {
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this.listeners.delete(listener);
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};
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}
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async stop(): Promise<void> {
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if (this.subscribed) {
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await this.redis.unsubscribe(this.channel);
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this.subscribed = false;
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}
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await this.redis.quit();
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}
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}
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