@rxap/nest-amqp
Version:
@rxap/nest-amqp
224 lines (223 loc) • 9.7 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.ClientRMQExchange = exports.REPLY_QUEUE = void 0;
const logger_service_1 = require("@nestjs/common/services/logger.service");
const random_string_generator_util_1 = require("@nestjs/common/utils/random-string-generator.util");
const shared_utils_1 = require("@nestjs/common/utils/shared.utils");
const microservices_1 = require("@nestjs/microservices");
const constants_1 = require("@nestjs/microservices/constants");
const serializers_1 = require("@nestjs/microservices/serializers");
const amqp_connection_manager_1 = require("amqp-connection-manager");
const events_1 = require("events");
const rxjs_1 = require("rxjs");
const operators_1 = require("rxjs/operators");
const incoming_response_deserializer_1 = require("./incoming-response.deserializer");
exports.REPLY_QUEUE = 'amq.rabbitmq.reply-to';
class ClientRMQExchange extends microservices_1.ClientProxy {
options;
logger;
connection$;
client = null;
channel = null;
responseEmitter;
constructor(options, logger = new logger_service_1.Logger(microservices_1.ClientProxy.name)) {
super();
this.options = options;
this.logger = logger;
this.initializeSerializer(options);
this.initializeDeserializer(options);
}
isConnected() {
return this.client && this.client.isConnected();
}
close() {
this.channel?.close();
this.client?.close();
this.channel = null;
this.client = null;
}
connect() {
if (this.client) {
return this.convertConnectionToPromise();
}
this.client = this.createClient();
this.handleError(this.client);
this.handleDisconnectError(this.client);
this.responseEmitter = new events_1.EventEmitter();
this.responseEmitter.setMaxListeners(0);
const connect$ = this.connect$(this.client);
const withDisconnect$ = this.mergeDisconnectEvent(this.client, connect$).pipe((0, rxjs_1.tap)(() => this.createChannel()));
const withReconnect$ = (0, rxjs_1.fromEvent)(this.client, constants_1.CONNECT_EVENT).pipe((0, rxjs_1.tap)(() => this.logger.log('Connected to RMQ', 'ClientRMQExchange')), (0, operators_1.skip)(1));
const source$ = (0, rxjs_1.merge)(withDisconnect$, withReconnect$);
this.connection$ = new rxjs_1.ReplaySubject(1);
source$.subscribe({
next: (data) => {
this.connection$.next(data.connection);
},
});
return this.convertConnectionToPromise();
}
createChannel() {
return new Promise((resolve) => {
this.channel = this.client.createChannel({
json: false,
setup: (channel) => this.setupExchange(channel, resolve),
});
});
}
createClient() {
const socketOptions = this.getOptionsProp(this.options, 'socketOptions');
return (0, amqp_connection_manager_1.connect)(this.options.urls, socketOptions);
}
mergeDisconnectEvent(instance, source$) {
const eventToError = (eventType) => (0, rxjs_1.fromEvent)(instance, eventType).pipe((0, operators_1.map)((err) => {
this.logger.error(`Error occurred for event type "${eventType}": ${err.message}`, err.stack, 'ClientRMQExchange');
throw err;
}));
const disconnect$ = eventToError(constants_1.DISCONNECT_EVENT);
const urls = this.getOptionsProp(this.options, 'urls', []) ?? [];
const connectFailed$ = eventToError(constants_1.CONNECT_FAILED_EVENT).pipe((0, operators_1.retryWhen)((e) => e.pipe((0, operators_1.scan)((errorCount, error) => {
if (urls.indexOf(error.url) >= urls.length - 1) {
throw error;
}
return errorCount + 1;
}, 0))));
// If we ever decide to propagate all disconnect errors & re-emit them through
// the "connection" stream then comment out "first()" operator.
return (0, rxjs_1.merge)(source$, disconnect$, connectFailed$).pipe((0, operators_1.first)());
}
async convertConnectionToPromise() {
// try {
return await (0, rxjs_1.firstValueFrom)(this.connection$);
// } catch (err) {
// if (err instanceof EmptyError) {
// return;
// }
// throw err;
// }
}
async setupExchange(channel, resolve) {
this.logger.verbose(`Setting up exchange '${this.options.exchange.name}'`, 'ClientRMQExchange');
if (!this.options.noAssert) {
await channel.assertExchange(this.options.exchange.name, this.options.exchange.type, this.options.exchange.options);
}
await this.consumeChannel(channel);
resolve();
}
async consumeChannel(channel) {
const noAck = this.getOptionsProp(this.options, 'noAck', constants_1.RQM_DEFAULT_NOACK);
await channel.consume(this.options.replyQueue ?? exports.REPLY_QUEUE, (msg) => {
if (msg) {
this.responseEmitter.emit(msg.properties.correlationId, msg);
}
else {
this.logger.warn(`Message is empty from RMQ queue ${this.options.replyQueue ?? exports.REPLY_QUEUE}`, 'ClientRMQExchange');
}
}, {
noAck,
});
}
handleError(client) {
client.addListener(constants_1.ERROR_EVENT, (err) => this.logger.error(err, undefined, 'ClientRMQExchange'));
}
handleDisconnectError(client) {
client.addListener(constants_1.DISCONNECT_EVENT, (err) => {
this.logger.error(constants_1.DISCONNECTED_RMQ_MESSAGE, undefined, 'ClientRMQExchange');
this.logger.error(err, undefined, 'ClientRMQExchange');
});
}
async handleMessage(packet, optionsOrCallback, callback) {
this.logger.verbose('Received message: %JSON', packet, 'ClientRMQExchange');
let options = undefined;
if ((0, shared_utils_1.isFunction)(options)) {
callback = options;
}
else {
options = optionsOrCallback;
}
if (!callback) {
throw new Error('No callback provided');
}
const { err, response, isDisposed } = await this.deserializer.deserialize(packet, options);
// this.logger.verbose('Deserialized response: %JSON', response, 'ClientRMQExchange');
if (err) {
this.logger.verbose('Deserialized error: %JSON', err, 'ClientRMQExchange');
}
// this.logger.verbose('Deserialized isDisposed: %JSON', isDisposed, 'ClientRMQExchange');
if (isDisposed || err) {
callback({
err,
response,
isDisposed: true,
});
}
callback({
err,
response,
});
}
publish(message, callback) {
this.logger.verbose('Publishing message: %JSON', message, 'ClientRMQExchange');
try {
const correlationId = (0, random_string_generator_util_1.randomStringGenerator)();
const listener = ({ content, fields, properties }) => this.handleMessage(this.parseMessageContent(content), {
fields,
properties,
}, callback);
Object.assign(message, { id: correlationId });
const serializedPacket = this.serializer.serialize(message);
const options = serializedPacket.options;
delete serializedPacket.options;
this.responseEmitter.on(correlationId, listener);
this.channel.publish(this.options.exchange.name, serializedPacket.pattern, Buffer.from(JSON.stringify(serializedPacket.data)), {
replyTo: this.options.replyQueue ?? exports.REPLY_QUEUE,
persistent: this.options.persistent,
...options,
headers: this.mergeHeaders(options?.headers),
correlationId,
}).catch((err) => callback({ err }));
return () => this.responseEmitter.removeListener(correlationId, listener);
}
catch (err) {
callback({ err });
}
return () => void 0;
}
dispatchEvent(packet) {
this.logger.verbose('Dispatching event: %JSON', packet, 'ClientRMQExchange');
const serializedPacket = this.serializer.serialize(packet);
const options = serializedPacket.options;
delete serializedPacket.options;
return new Promise((resolve, reject) => this.channel.publish(this.options.exchange.name, serializedPacket.pattern, Buffer.from(JSON.stringify(serializedPacket.data)), {
persistent: this.options.persistent,
...options,
headers: this.mergeHeaders(options?.headers),
}, (err) => (err ? reject(err) : resolve())));
}
initializeSerializer(options) {
this.serializer = options.serializer ?? new serializers_1.RmqRecordSerializer();
}
initializeDeserializer(options) {
this.deserializer =
options.deserializer ?? new incoming_response_deserializer_1.IncomingResponseDeserializer();
}
mergeHeaders(requestHeaders) {
if (!requestHeaders && !this.options?.headers) {
return undefined;
}
return {
...this.options?.headers,
...requestHeaders,
};
}
parseMessageContent(content) {
const rawContent = content.toString();
try {
return JSON.parse(rawContent);
}
catch {
return rawContent;
}
}
}
exports.ClientRMQExchange = ClientRMQExchange;