Publisher Confirms with Spring Cloud Stream - rabbitmq

Question

I'm interested to use Publisher Confirms in some producers that we have in a project, using Spring Cloud Stream. I have tried doing a small PoC but it is not working. As far as I see in the documentation, this is possible for Asyncrhonous Publisher Confirm, and it should be as easy as do the next changes:
Add in the application.yml the confirmAckChannel and enable the errorChannelEnabled property.
spring.cloud.stream:
binders:
rabbitDefault:
defaultCandidate: false
type: rabbit
environment.spring.rabbitmq.host: ${spring.rabbitmq.addresses}
....
bindings:
testOutput:
destination: test
binder: rabbitDefault
content-type: application/json
rabbit.bindings:
testOutput.producer:
confirmAckChannel: "testAck"
errorChannelEnabled: true
Then a simple service triggered by an endpoint, where I insert the header related with the errorChannel to the event.
#Service
#RequiredArgsConstructor
public class TestService {
private final TestPublisher testPublisher;
public void sendMessage() {
testPublisher.send(addHeaders());
}
private Message<Event<TestEvent>> addHeaders() {
return withPayload(new Event<>(TestEvent.builder().build()))
.setHeader(MessageHeaders.ERROR_CHANNEL, "errorChannelTest")
.build();
}
}
And then the Publisher of RabbitMQ
#Component
#RequiredArgsConstructor
public class TestPublisher {
private final MessagingChannels messagingChannels;
public boolean send(Message<Event<TestEvent>> message) {
return messagingChannels.test().send(message);
}
}
Where MessagingChannels is implemented as
public interface MessagingChannels {
#Input("testAck")
MessageChannel testAck();
#Input("errorChannelTest")
MessageChannel testError();
#Output("testOutput")
MessageChannel test();
}
After that, I have implemented 2 listeners, one for errorChannelTest input and the other one for testAck.
#Slf4j
#Component
#RequiredArgsConstructor
class TestErrorListener {
#StreamListener("errorChannelTest")
void onCommandReceived(Event<Message> message) {
log.info("Message error received: " + message);
}
}
#Slf4j
#Component
#RequiredArgsConstructor
class TestAckListener {
#StreamListener("testAck")
void onCommandReceived(Event<Message> message) {
log.info("Message ACK received: " + message);
}
}
However, I didn't receive any ACK or NACK for RabbitMQ in these 2 listeners, the event was sent properly to RabbitMQ and manage by the exchange, but then I haven't received any response from RabbitMQ.
Am I missing something? I have checked also with these 2 properties, but it doesn't work as well
spring:
rabbitmq:
publisher-confirm-type: CORRELATED
publisher-returns: true
I'm using Spring-Cloud-Stream 3.0.1.RELEASE and spring-cloud-starter-stream-rabbit 3.0.1.RELEASE
----EDITED------
This is the sample working updated with the recommendations of Gary Russell
Application.yml
spring.cloud.stream:
binders:
rabbitDefault:
defaultCandidate: false
type: rabbit
environment.spring.rabbitmq.host: ${spring.rabbitmq.addresses}
bindings:
testOutput:
destination: exchange.output.test
binder: rabbitDefault
content-type: application/json
testOutput.producer:
errorChannelEnabled: true
rabbit.bindings:
testOutput.producer:
confirmAckChannel: "testAck"
spring:
rabbitmq:
publisher-confirm-type: correlated
publisher-returns: true
TestService
#Service
#RequiredArgsConstructor
public class TestService {
private final TestPublisher testPublisher;
public void sendMessage() {
testPublisher.send(addHeaders());
}
private Message<Event<TestEvent>> addHeaders(Test test) {
return withPayload(new Event<>(TestEvent.builder().test(test).build()))
.build();
}
}
TestService is triggered by an endpoint in the next simple controller to check this PoC.
#RestController
#RequiredArgsConstructor
public class TestController {
private final TestService testService;
#PostMapping("/services/v1/test")
public ResponseEntity<Object> test(#RequestBody Test test) {
testService.sendMessage(test);
return ResponseEntity.ok().build();
}
}
And then the Publisher of RabbitMQ with both ServiceActivators
#Component
#RequiredArgsConstructor
public class TestPublisher {
private final MessagingChannels messagingChannels;
public boolean send(Message<Event<TestEvent>> message) {
log.info("Message for Testing Publisher confirms sent: " + message);
return messagingChannels.test().send(message);
}
#ServiceActivator(inputChannel = TEST_ACK)
public void acks(Message<?> ack) {
log.info("Message ACK received for Test: " + ack);
}
#ServiceActivator(inputChannel = TEST_ERROR)
public void errors(Message<?> error) {
log.info("Message error for Test received: " + error);
}
}
Where MessagingChannels is implemented as
public interface MessagingChannels {
#Input("testAck")
MessageChannel testAck();
#Input("testOutput.errors")
MessageChannel testError();
#Output("testOutput")
MessageChannel test();
}
This is the Main of the application (I have checked with #EnableIntegration too).
#EnableBinding(MessagingChannels.class)
#SpringBootApplication
#EnableScheduling
public class Main {
public static void main(String[] args) {
SpringApplication.run(Main.class, args);
}
}

Answer 1

testAck should not be a binding; it should be a #ServiceActivator instead.
.setHeader(MessageHeaders.ERROR_CHANNEL, "errorChannelTest")
That won't work in this context; errors are sent to a channel named testOutput.errors; again; this needs a #ServiceActivator, not a binding.
You have errorChannelEnabled in the wrong place; it's a common producer property, not rabbit-specific.
#SpringBootApplication
#EnableBinding(Source.class)
public class So62219823Application {
public static void main(String[] args) {
SpringApplication.run(So62219823Application.class, args);
}
#InboundChannelAdapter(channel = "output")
public String source() {
return "foo";
}
#ServiceActivator(inputChannel = "acks")
public void acks(Message<?> ack) {
System.out.println("Ack: " + ack);
}
#ServiceActivator(inputChannel = "output.errors")
public void errors(Message<?> error) {
System.out.println("Error: " + error);
}
}
spring:
cloud:
stream:
bindings:
output:
producer:
error-channel-enabled: true
rabbit:
bindings:
output:
producer:
confirm-ack-channel: acks
rabbitmq:
publisher-confirm-type: correlated
publisher-returns: true