feat(microservices): add noAssert option for RMQ connection

Rabbit MQ brokers may not allow for queue declaration, so a check is needed to avoid 403 errors in that scenario

Author: agrofrank

packages/microservices/client/client-rmq.ts

@@ -16,6 +16,7 @@ import {
   RQM_DEFAULT_QUEUE,
   RQM_DEFAULT_QUEUE_OPTIONS,
   RQM_DEFAULT_URL,
+  RQM_DEFAULT_NO_ASSERT,
 } from '../constants';
 import { RmqUrl } from '../external/rmq-url.interface';
 import { ReadPacket, RmqOptions, WritePacket } from '../interfaces';
@@ -38,6 +39,7 @@ export class ClientRMQ extends ClientProxy {
   protected responseEmitter: EventEmitter;
   protected replyQueue: string;
   protected persistent: boolean;
+  protected noAssert: boolean;
 
   constructor(protected readonly options: RmqOptions['options']) {
     super();
@@ -51,6 +53,9 @@ export class ClientRMQ extends ClientProxy {
       this.getOptionsProp(this.options, 'replyQueue') || REPLY_QUEUE;
     this.persistent =
       this.getOptionsProp(this.options, 'persistent') || RQM_DEFAULT_PERSISTENT;
+    this.noAssert =
+      this.getOptionsProp(this.options, 'noAssert') || RQM_DEFAULT_NO_ASSERT;
+
     loadPackage('amqplib', ClientRMQ.name, () => require('amqplib'));
     rqmPackage = loadPackage('amqp-connection-manager', ClientRMQ.name, () =>
       require('amqp-connection-manager'),
@@ -143,7 +148,9 @@ export class ClientRMQ extends ClientProxy {
       this.getOptionsProp(this.options, 'isGlobalPrefetchCount') ||
       RQM_DEFAULT_IS_GLOBAL_PREFETCH_COUNT;
 
-    await channel.assertQueue(this.queue, this.queueOptions);
+    if (!this.queueOptions.noAssert) {
+      await channel.assertQueue(this.queue, this.queueOptions);
+    }
     await channel.prefetch(prefetchCount, isGlobalPrefetchCount);
 
     this.responseEmitter = new EventEmitter();

packages/microservices/constants.ts

@@ -36,6 +36,7 @@ export const RQM_DEFAULT_IS_GLOBAL_PREFETCH_COUNT = false;
 export const RQM_DEFAULT_QUEUE_OPTIONS = {};
 export const RQM_DEFAULT_NOACK = true;
 export const RQM_DEFAULT_PERSISTENT = false;
+export const RQM_DEFAULT_NO_ASSERT = false;
 export const GRPC_DEFAULT_PROTO_LOADER = '@grpc/proto-loader';
 
 export const NO_MESSAGE_HANDLER = `There is no matching message handler defined in the remote service.`;

packages/microservices/interfaces/microservice-configuration.interface.ts

@@ -184,6 +184,7 @@ export interface RmqOptions {
     replyQueue?: string;
     persistent?: boolean;
     headers?: Record<string, string>;
+    noAssert?: boolean;
   };
 }
 

packages/microservices/server/server-rmq.ts

@@ -16,6 +16,7 @@ import {
   RQM_DEFAULT_QUEUE,
   RQM_DEFAULT_QUEUE_OPTIONS,
   RQM_DEFAULT_URL,
+  RQM_DEFAULT_NO_ASSERT,
 } from '../constants';
 import { RmqContext } from '../ctx-host';
 import { Transport } from '../enums';
@@ -40,6 +41,7 @@ export class ServerRMQ extends Server implements CustomTransportStrategy {
   protected readonly prefetchCount: number;
   protected readonly queueOptions: any;
   protected readonly isGlobalPrefetchCount: boolean;
+  protected readonly noAssert: boolean;
 
   constructor(protected readonly options: RmqOptions['options']) {
     super();
@@ -55,6 +57,8 @@ export class ServerRMQ extends Server implements CustomTransportStrategy {
     this.queueOptions =
       this.getOptionsProp(this.options, 'queueOptions') ||
       RQM_DEFAULT_QUEUE_OPTIONS;
+    this.noAssert =
+      this.getOptionsProp(this.options, 'noAssert') || RQM_DEFAULT_NO_ASSERT;
 
     this.loadPackage('amqplib', ServerRMQ.name, () => require('amqplib'));
     rqmPackage = this.loadPackage(
@@ -115,7 +119,9 @@ export class ServerRMQ extends Server implements CustomTransportStrategy {
   public async setupChannel(channel: any, callback: Function) {
     const noAck = this.getOptionsProp(this.options, 'noAck', RQM_DEFAULT_NOACK);
 
-    await channel.assertQueue(this.queue, this.queueOptions);
+    if (!this.queueOptions.noAssert) {
+      await channel.assertQueue(this.queue, this.queueOptions);
+    }
     await channel.prefetch(this.prefetchCount, this.isGlobalPrefetchCount);
     channel.consume(
       this.queue,