nestjs-event-store-cqrs/dist/event-store.service.js

NestJS CQRS event source module for KafkaJS

"use strict";
var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
    var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
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};
var __metadata = (this && this.__metadata) || function (k, v) {
    if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
};
var __param = (this && this.__param) || function (paramIndex, decorator) {
    return function (target, key) { decorator(target, key, paramIndex); }
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.EventStoreService = void 0;
const common_1 = require("@nestjs/common");
const constants_1 = require("./constants");
const kafkajs_1 = require("kafkajs");
const cqrs_1 = require("@nestjs/cqrs");
let EventStoreService = class EventStoreService {
    constructor(options, eventBus) {
        this.eventBus = eventBus;
        this.logger = new common_1.Logger(this.constructor.name);
        this.events = [];
        this.eventsForSearch = {};
        this.addEvents(options.events);
        this.clientConfig = Object.assign(Object.assign({}, constants_1.DEFAULT_CLIENT_CONFIG), options.client);
        this.consumerConfig = Object.assign(Object.assign({}, constants_1.DEFAULT_CONSUMER_CONFIG), options.consumer);
    }
    async onModuleInit() {
        this.connect();
        this.logger.verbose('EventStore modile init');
        this.subject$ = this.eventBus.subject$;
        this.bridgeEventsTo(this.eventBus.subject$);
        this.eventBus.publisher = this;
    }
    async onModuleDestroy() {
        await this.disconnect();
        this.logger.log('EventStore connection destroyed');
    }
    async connect() {
        this.client = new kafkajs_1.Kafka(this.clientConfig);
        this.producer = await this.client.producer();
        await this.producer.connect();
        this.logger.verbose('EventStore producer connected');
        this.consumer = await this.client.consumer(this.consumerConfig);
        await this.consumer.connect();
        this.logger.verbose('EventStore consumer connected');
        await this.subscribe();
    }
    async subscribe() {
        try {
            const subscriptions = [];
            this.events.forEach((event) => {
                subscriptions.push(this.consumer.subscribe({
                    topic: event.name,
                    fromBeginning: false,
                }));
            });
            if (!subscriptions.length) {
                this.logger.log('EventStore module was init without eventHandlers');
                return;
            }
            await Promise.all(subscriptions);
            await this.consumer.run({
                eachMessage: async ({ topic, message }) => {
                    const value = JSON.parse(message.value.toString());
                    if (this.events && this.eventsForSearch[topic]) {
                        const func = new this.eventsForSearch[topic](...Object.values(value));
                        this.subject$.next(func);
                    }
                    else
                        [
                            this.logger.warn(`Event of type ${topic} not handled`, this.constructor.name),
                        ];
                },
            });
        }
        catch (error) {
            this.logger.error(`subscribe event error: ${error.stack}`);
        }
    }
    async disconnect() {
        var _a, _b;
        await ((_a = this.producer) === null || _a === void 0 ? void 0 : _a.disconnect());
        await ((_b = this.consumer) === null || _b === void 0 ? void 0 : _b.disconnect());
    }
    async publish(event) {
        if (event === undefined) {
            return;
        }
        if (event === null) {
            return;
        }
        const eventPayload = {
            topic: event.constructor.name,
            messages: [{ value: JSON.stringify(event) }],
        };
        await this.producer.send(eventPayload);
    }
    async bridgeEventsTo(subject) {
        this.subject$ = subject;
    }
    addEvents(events = []) {
        this.events = [...this.events, ...events];
        this.events.map((event) => {
            this.eventsForSearch[event.name] = event;
        });
    }
};
EventStoreService = __decorate([
    (0, common_1.Injectable)(),
    __param(0, (0, common_1.Inject)(constants_1.EVENT_STORE_OPTIONS)),
    __metadata("design:paramtypes", [Object, cqrs_1.EventBus])
], EventStoreService);
exports.EventStoreService = EventStoreService;
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