@tulioncds/nestjs-nats-streaming-transport/dist/listener.js

Fork Nats Streaming Transport for NestJS - Auto Reconnect stan

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Listener = void 0;
const microservices_1 = require("@nestjs/microservices");
const nats_streaming_context_1 = require("./nats-streaming.context");
const create_stan_connection_1 = require("./utils/create-stan-connection");
const build_subscription_options_1 = require("./utils/build-subscription-options");
const parse_message_1 = require("./utils/parse-message");
class Listener extends microservices_1.Server {
    constructor(clusterId, clientId, queueGroup, connectOptions, subscriptionOptions) {
        super();
        this.clusterId = clusterId;
        this.clientId = clientId;
        this.queueGroup = queueGroup;
        this.connectOptions = connectOptions;
        this.subscriptionOptions = subscriptionOptions;
    }
    async listen(callback) {
        this.logger.log('Setting up event listeners...');
        this.connection = await (0, create_stan_connection_1.createConnection)(this.clusterId, this.clientId, this.connectOptions, this.bindEventHandlers.bind(this));
        this.bindEventHandlers();
        callback();
    }
    close() {
        this.connection.close();
    }
    async bindEventHandlers() {
        const registerdPatterns = Array.from(this.messageHandlers.keys());
        if (!registerdPatterns) {
            this.logger.log('No message handlers registered');
        }
        registerdPatterns.forEach((subject) => {
            const options = (0, build_subscription_options_1.buildSubscriptionOptions)(this.subscriptionOptions, this.connection);
            const subscription = this.connection.subscribe(subject, this.queueGroup, options);
            subscription.on('message', async (msg) => {
                const handler = this.getHandlerByPattern(subject);
                const data = (0, parse_message_1.parseMessage)(msg);
                const context = new nats_streaming_context_1.NatsStreamingContext([msg]);
                const stream = this.transformToObservable(await handler(data, context));
                this.send(stream, () => null);
            });
            this.logger.log(`Subscribed to ${subject}`);
        });
    }
}
exports.Listener = Listener;
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