@nestjstools/messaging-rabbitmq-extension/lib/consumer/rabbitmq-messaging.consumer.js

Extension to handle messages and dispatch them over AMQP protocol

"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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    else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
    return c > 3 && r && Object.defineProperty(target, key, r), r;
};
var __metadata = (this && this.__metadata) || function (k, v) {
    if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.RabbitmqMessagingConsumer = void 0;
const amqp_channel_1 = require("../channel/amqp.channel");
const const_1 = require("../const");
const messaging_1 = require("@nestjstools/messaging");
const common_1 = require("@nestjs/common");
const messaging_2 = require("@nestjstools/messaging");
const rabbitmq_migrator_1 = require("../migrator/rabbitmq.migrator");
const buffer_1 = require("buffer");
let RabbitmqMessagingConsumer = class RabbitmqMessagingConsumer {
    constructor(rabbitMqMigrator) {
        this.rabbitMqMigrator = rabbitMqMigrator;
        this.channel = undefined;
    }
    async consume(dispatcher, channel) {
        await channel.init();
        this.channel = channel;
        await this.rabbitMqMigrator.run(channel);
        const amqpChannel = await this.channel.connection.createChannel();
        this.amqpChannel = amqpChannel;
        if (!amqpChannel) {
            throw new Error('AMQP channel not initialized');
        }
        await amqpChannel.prefetch(1);
        await amqpChannel.consume(channel.config.queue, async (msg) => {
            if (!msg)
                return;
            let message = msg.content;
            if (buffer_1.Buffer.isBuffer(message)) {
                message = JSON.parse(message.toString());
            }
            const routingKey = msg.properties.headers?.[const_1.RABBITMQ_HEADER_ROUTING_KEY] ??
                msg.fields.routingKey;
            if (dispatcher.isReady()) {
                await dispatcher.dispatch(new messaging_1.ConsumerMessage(message, routingKey));
                amqpChannel.ack(msg);
                return;
            }
            amqpChannel.nack(msg, false, true);
        }, { noAck: false });
    }
    async onError(errored, channel) {
        if (channel.config.deadLetterQueueFeature && this.amqpChannel) {
            const exchange = 'dead_letter.exchange';
            const routingKey = `${channel.config.queue}_dead_letter`;
            this.amqpChannel.publish(exchange, routingKey, buffer_1.Buffer.from(JSON.stringify(errored.dispatchedConsumerMessage.message)), {
                headers: {
                    'messaging-routing-key': errored.dispatchedConsumerMessage.routingKey,
                },
            });
        }
    }
    async onModuleDestroy() {
        if (this.channel?.connection) {
            await this.channel.connection.close();
        }
        this.channel = undefined;
    }
};
exports.RabbitmqMessagingConsumer = RabbitmqMessagingConsumer;
exports.RabbitmqMessagingConsumer = RabbitmqMessagingConsumer = __decorate([
    (0, common_1.Injectable)(),
    (0, messaging_2.MessageConsumer)(amqp_channel_1.AmqpChannel),
    __metadata("design:paramtypes", [rabbitmq_migrator_1.RabbitmqMigrator])
], RabbitmqMessagingConsumer);
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