redikit/dist/pubsub.js

TypeScript version of lightweight Redis utility functions for caching and pub/sub

"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
Object.defineProperty(exports, "__esModule", { value: true });
const redis_1 = require("redis");
class RedisPubSub {
    static connect() {
        return __awaiter(this, void 0, void 0, function* () {
            if (this.connected)
                return;
            this.publisher = (0, redis_1.createClient)();
            this.subscriber = (0, redis_1.createClient)();
            this.publisher.on('error', (err) => console.error('Publisher Error:', err));
            this.subscriber.on('error', (err) => console.error('Subscriber Error:', err));
            yield Promise.all([this.publisher.connect(), this.subscriber.connect()]);
            this.connected = true;
        });
    }
    static publish(channel, message) {
        return __awaiter(this, void 0, void 0, function* () {
            yield this.connect();
            if (!this.publisher)
                throw new Error('Publisher client not initialized');
            yield this.publisher.publish(channel, JSON.stringify(message));
        });
    }
    static subscribe(channel, callback) {
        return __awaiter(this, void 0, void 0, function* () {
            yield this.connect();
            if (!this.subscriber)
                throw new Error('Subscriber client not initialized');
            // Redis v4 subscribe returns a Promise resolving once subscription starts
            yield this.subscriber.subscribe(channel, (message) => {
                try {
                    callback(JSON.parse(message));
                }
                catch (_a) {
                    callback(message); // fallback in case JSON parsing fails
                }
            });
        });
    }
}
RedisPubSub.publisher = null;
RedisPubSub.subscriber = null;
RedisPubSub.connected = false;
exports.default = RedisPubSub;