feat(microservices): Add producer reference to KafkaContext

packages/microservices/ctx-host/kafka.context.ts

@@ -1,4 +1,4 @@
-import { Consumer, KafkaMessage } from '../external/kafka.interface';
+import { Consumer, KafkaMessage, Producer } from '../external/kafka.interface';
 import { BaseRpcContext } from './base-rpc.context';
 
 type KafkaContextArgs = [
@@ -7,6 +7,7 @@ type KafkaContextArgs = [
   topic: string,
   consumer: Consumer,
   heartbeat: () => Promise<void>,
+  producer: Producer,
 ];
 
 export class KafkaContext extends BaseRpcContext<KafkaContextArgs> {
@@ -48,4 +49,11 @@ export class KafkaContext extends BaseRpcContext<KafkaContextArgs> {
   getHeartbeat() {
     return this.args[4];
   }
+
+  /**
+   * Returns the Kafka producer reference,
+   */
+  getProducer() {
+    return this.args[5];
+  }
 }

packages/microservices/server/server-kafka.ts

@@ -168,6 +168,7 @@ export class ServerKafka extends Server implements CustomTransportStrategy {
       payload.topic,
       this.consumer,
       payload.heartbeat,
+      this.producer,
     ]);
     const handler = this.getHandlerByPattern(packet.pattern);
     // if the correlation id or reply topic is not set

packages/microservices/test/ctx-host/kafka.context.spec.ts

@@ -1,6 +1,10 @@
 import { expect } from 'chai';
 import { KafkaContext } from '../../ctx-host';
-import { Consumer, KafkaMessage } from '../../external/kafka.interface';
+import {
+  Consumer,
+  KafkaMessage,
+  Producer,
+} from '../../external/kafka.interface';
 
 describe('KafkaContext', () => {
   const args = [
@@ -9,12 +13,20 @@ describe('KafkaContext', () => {
     undefined,
     { test: 'consumer' },
     () => {},
+    { test: 'producer' },
   ];
   let context: KafkaContext;
 
   beforeEach(() => {
     context = new KafkaContext(
-      args as [KafkaMessage, number, string, Consumer, () => Promise<void>],
+      args as [
+        KafkaMessage,
+        number,
+        string,
+        Consumer,
+        () => Promise<void>,
+        Producer,
+      ],
     );
   });
   describe('getTopic', () => {
@@ -42,4 +54,9 @@ describe('KafkaContext', () => {
       expect(context.getHeartbeat()).to.be.eql(args[4]);
     });
   });
+  describe('getProducer', () => {
+    it('should return producer instance', () => {
+      expect(context.getProducer()).to.deep.eq({ test: 'producer' });
+    });
+  });
 });