nats.docs/_examples/publish_with_reply.html

<div class="tab-wrap">
  	
	
	<input type="radio" id="publish_with_reply_go" name="publish_with_reply" class="tab" checked>
	
	<label for="publish_with_reply_go" class="api-lang" data-language="go">Go</label>
	
	
	<input type="radio" id="publish_with_reply_java" name="publish_with_reply" class="tab">
	
	<label for="publish_with_reply_java" class="api-lang" data-language="java">Java</label>
	
	
	<input type="radio" id="publish_with_reply_js" name="publish_with_reply" class="tab">
	
	<label for="publish_with_reply_js" class="api-lang" data-language="js">JavaScript</label>
	
	
	<input type="radio" id="publish_with_reply_py" name="publish_with_reply" class="tab">
	
	<label for="publish_with_reply_py" class="api-lang" data-language="py">Python</label>
	
	
	<input type="radio" id="publish_with_reply_ruby" name="publish_with_reply" class="tab">
	
	<label for="publish_with_reply_ruby" class="api-lang" data-language="ruby">Ruby</label>
	
	
	<input type="radio" id="publish_with_reply_ts" name="publish_with_reply" class="tab">
	
	<label for="publish_with_reply_ts" class="api-lang" data-language="ts">TypeScript</label>
	

  	
	<div class="tab__content">
	<pre id="publish_with_reply_go_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/go-nats-examples/blob/master/api-examples/publish_with_reply/main.go#L11-42"><i class="mdi mdi-github-circle" title="View on GitHub"></i></a><a class="toolbar-icons pull-right"><i class="mdi mdi-content-copy js-copy" title="Copy to Clipboard"></i></a><span class="copy-msg pull-right"></span><code class="language-go">nc, err := nats.Connect(&#34;demo.nats.io&#34;)
if err != nil {
	log.Fatal(err)
}
defer nc.Close()

// Create a unique subject name for replies.
uniqueReplyTo := nats.NewInbox()

// Listen for a single response
sub, err := nc.SubscribeSync(uniqueReplyTo)
if err != nil {
	log.Fatal(err)
}

// Send the request.
// If processing is synchronous, use Request() which returns the response message.
if err := nc.PublishRequest(&#34;time&#34;, uniqueReplyTo, nil); err != nil {
	log.Fatal(err)
}

// Read the reply
msg, err := sub.NextMsg(time.Second)
if err != nil {
	log.Fatal(err)
}

// Use the response
log.Printf(&#34;Reply: %s&#34;, msg.Data)

</code></pre>
	</div>
	
	<div class="tab__content">
	<pre id="publish_with_reply_java_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/java-nats-examples/blob/master/src/main/java/io/nats/examples/PublishWithReply.java#L16-37"><i class="mdi mdi-github-circle" title="View on GitHub"></i></a><a class="toolbar-icons pull-right"><i class="mdi mdi-content-copy js-copy" title="Copy to Clipboard"></i></a><span class="copy-msg pull-right"></span><code class="language-java">Connection nc = Nats.connect(&#34;nats://demo.nats.io:4222&#34;);

// Create a unique subject name
String uniqueReplyTo = NUID.nextGlobal();

// Listen for a single response
Subscription sub = nc.subscribe(uniqueReplyTo);
sub.unsubscribe(1);

// Send the request
nc.publish(&#34;time&#34;, uniqueReplyTo, null);

// Read the reply
Message msg = sub.nextMessage(Duration.ofSeconds(1));

// Use the response
System.out.println(new String(msg.getData(), StandardCharsets.UTF_8));

// Close the connection
nc.close();
</code></pre>
	</div>
	
	<div class="tab__content">
	<pre id="publish_with_reply_js_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/node-nats-examples/blob/master/src/publisher_samples.js#L38-55"><i class="mdi mdi-github-circle" title="View on GitHub"></i></a><a class="toolbar-icons pull-right"><i class="mdi mdi-content-copy js-copy" title="Copy to Clipboard"></i></a><span class="copy-msg pull-right"></span><code class="language-javascript">let nc = NATS.connect({url: &#34;nats://demo.nats.io:4222&#34;});
// set up a subscription to process the request
nc.subscribe(&#39;time&#39;, (msg, reply) =&gt; {
    if(reply) {
        nc.publish(reply, new Date().toLocaleTimeString());
    }
});

// create a subscription subject that the responding send replies to
let inbox = NATS.createInbox();
nc.subscribe(inbox, {max: 1}, (msg) =&gt; {
    t.log(&#39;the time is&#39;, msg);
    nc.close();
});

nc.publish(&#39;time&#39;, &#34;&#34;, inbox);
</code></pre>
	</div>
	
	<div class="tab__content">
	<pre id="publish_with_reply_py_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/asyncio-nats-examples/blob/master/publish_with_reply.py#L8-27"><i class="mdi mdi-github-circle" title="View on GitHub"></i></a><a class="toolbar-icons pull-right"><i class="mdi mdi-content-copy js-copy" title="Copy to Clipboard"></i></a><span class="copy-msg pull-right"></span><code class="language-python">nc = NATS()

future = asyncio.Future()

async def sub(msg):
  nonlocal future
  future.set_result(msg)

await nc.connect(servers=[&#34;nats://demo.nats.io:4222&#34;])
await nc.subscribe(&#34;time&#34;, cb=sub)

unique_reply_to = new_inbox()
await nc.publish_request(&#34;time&#34;, unique_reply_to, b&#39;&#39;)

# Use the response
msg = await asyncio.wait_for(future, 1)
print(&#34;Reply:&#34;, msg)

</code></pre>
	</div>
	
	<div class="tab__content">
	<pre id="publish_with_reply_ruby_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/ruby-nats-examples/blob/master/publish_with_reply.rb#L1-22"><i class="mdi mdi-github-circle" title="View on GitHub"></i></a><a class="toolbar-icons pull-right"><i class="mdi mdi-content-copy js-copy" title="Copy to Clipboard"></i></a><span class="copy-msg pull-right"></span><code class="language-ruby">require &#39;nats/client&#39;
require &#39;fiber&#39;

NATS.start(servers:[&#34;nats://127.0.0.1:4222&#34;]) do |nc|
  Fiber.new do
    f = Fiber.current

    nc.subscribe(&#34;time&#34;) do |msg, reply|
      f.resume msg
    end

    nc.publish(&#34;time&#34;, &#39;example&#39;, NATS.create_inbox)

    # Use the response
    msg = Fiber.yield
    puts &#34;Reply: #{msg}&#34;

  end.resume
end

</code></pre>
	</div>
	
	<div class="tab__content">
	<pre id="publish_with_reply_ts_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/ts-nats-examples/blob/master/src/publisher_samples.ts#L38-61"><i class="mdi mdi-github-circle" title="View on GitHub"></i></a><a class="toolbar-icons pull-right"><i class="mdi mdi-content-copy js-copy" title="Copy to Clipboard"></i></a><span class="copy-msg pull-right"></span><code class="language-javascript">// set up a subscription to process the request
await nc.subscribe(&#39;time&#39;, (err, msg) =&gt; {
    if (err) {
        // this example is running inside of a promise
        reject();
        return;
    }
    if (msg.reply) {
        nc.publish(msg.reply, new Date().toLocaleTimeString());
    }
});

// create a subscription subject that the responding send replies to
let inbox = createInbox();
await nc.subscribe(inbox, (err, msg) =&gt; {
    t.log(&#39;the time is&#39;, msg.data);
    // this example is running inside of a promise
    nc.close();
    resolve();
}, {max: 1});

nc.publish(&#39;time&#39;, &#34;&#34;, inbox);
</code></pre>
	</div>
	
</div>