exposed and enabled queue option for consumer opts (#162)

FIX #nats-io/nats.js/issues/432

nats-base-client/jsclient.ts

@@ -369,6 +369,7 @@ export class JetStreamClientImpl extends BaseApiClient
       so.dispatchedFn = autoAckJsMsg;
     }
     so.max = jsi.max || 0;
+    so.queue = jsi.queue;
     return so;
   }
 

nats-base-client/jsconsumeropts.ts

@@ -42,6 +42,7 @@ export class ConsumerOptsBuilderImpl implements ConsumerOptsBuilder {
   stream: string;
   callbackFn?: JsMsgCallback;
   max?: number;
+  qname?: string;
 
   constructor(opts?: Partial<ConsumerConfig>) {
     this.stream = "";
@@ -58,6 +59,7 @@ export class ConsumerOptsBuilderImpl implements ConsumerOptsBuilder {
     o.stream = this.stream;
     o.callbackFn = this.callbackFn;
     o.max = this.max;
+    o.queue = this.qname;
     return o;
   }
 
@@ -129,6 +131,10 @@ export class ConsumerOptsBuilderImpl implements ConsumerOptsBuilder {
   callback(fn: JsMsgCallback) {
     this.callbackFn = fn;
   }
+
+  queue(n: string) {
+    this.qname = n;
+  }
 }
 
 export function isConsumerOptsBuilder(

nats-base-client/types.ts

@@ -321,6 +321,7 @@ export interface ConsumerOpts {
 
   // standard
   max?: number;
+  queue?: string;
   debug?: boolean;
 }
 
@@ -355,6 +356,8 @@ export interface ConsumerOptsBuilder {
   maxWaiting(max: number): void;
   // standard nats subscribe option for the maximum number of messages to receive on the subscription
   maxMessages(max: number): void;
+  // standard nats queue group option
+  queue(n: string): void;
   // callback to process messages (or iterator is returned)
   callback(fn: JsMsgCallback): void;
 }

tests/jetstream_test.ts

@@ -1556,3 +1556,35 @@ Deno.test("jetstream - JSON", async () => {
   }
   await cleanup(ns, nc);
 });
+
+Deno.test("jetstream - qsub", async () => {
+  const { ns, nc } = await setup(jetstreamServerConf({}, true));
+  const { subj } = await initStream(nc);
+  const js = nc.jetstream();
+
+  const opts = consumerOpts();
+  opts.queue("q");
+  opts.durable("n");
+  opts.deliverTo("here");
+  opts.callback((err, m) => {
+    if (m) {
+      m.ack();
+    }
+  });
+
+  const sub = await js.subscribe(subj, opts);
+  const sub2 = await js.subscribe(subj, opts);
+
+  for (let i = 0; i < 100; i++) {
+    await js.publish(subj, Empty);
+  }
+  await nc.flush();
+  await sub.drain();
+  await sub2.drain();
+
+  assert(sub.getProcessed() > 0);
+  assert(sub2.getProcessed() > 0);
+  assertEquals(sub.getProcessed() + sub2.getProcessed(), 100);
+
+  await cleanup(ns, nc);
+});