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Add RabbitMQ Stream service connection from RabbitMQContainer #42443
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            eddumelendez
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  .../main/java/org/springframework/boot/autoconfigure/amqp/RabbitStreamConnectionDetails.java
  
  
      
      
   
        
      
      
    
  
    
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              | Original file line number | Diff line number | Diff line change | 
|---|---|---|
| @@ -0,0 +1,65 @@ | ||
| /* | ||
| * Copyright 2012-2024 the original author or authors. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * https://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|  | ||
| package org.springframework.boot.autoconfigure.amqp; | ||
|  | ||
| import org.springframework.boot.autoconfigure.service.connection.ConnectionDetails; | ||
|  | ||
| /** | ||
| * Details required to establish a connection to a RabbitMQ service. | ||
| * | ||
| * @author Eddú Meléndez | ||
| * @since 3.4.0 | ||
| */ | ||
| public interface RabbitStreamConnectionDetails extends ConnectionDetails { | ||
|         
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|  | ||
| /** | ||
| * Rabbit server host. | ||
| * @return the rabbit server host | ||
| */ | ||
| String getHost(); | ||
|  | ||
| /** | ||
| * Rabbit server port. | ||
| * @return the rabbit server port | ||
| */ | ||
| int getPort(); | ||
|  | ||
| /** | ||
| * Login user to authenticate to the broker. | ||
| * @return the login user to authenticate to the broker or {@code null} | ||
| */ | ||
| default String getUsername() { | ||
| return null; | ||
| } | ||
|  | ||
| /** | ||
| * Login to authenticate against the broker. | ||
| * @return the login to authenticate against the broker or {@code null} | ||
| */ | ||
| default String getPassword() { | ||
| return null; | ||
| } | ||
|  | ||
| /** | ||
| * Virtual host to use when connecting to the broker. | ||
| * @return the virtual host to use when connecting to the broker or {@code null} | ||
| */ | ||
| default String getVirtualHost() { | ||
| return null; | ||
| } | ||
|  | ||
| } | ||
  
    
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Why do we need this? Especially given the javadoc, it looks like to me that the existing
RabbitConnectionDetailsshould be enough, isn't it?There was a problem hiding this comment.
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rabbitmq stream uses a different port and in order to do that the plugin should be enabled. Having two implementations of
RabbitConnectionDetailswill lead to having an exception with 2 beans unless other beans or configuration are disabled when stream are enabled.I think would be possible to have a different virtual host for stream in a single RabbitMQ instance, so, having a specific
ConnectionDetailswould make sense.There was a problem hiding this comment.
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I think there's a bug in the current code as we're not taking
RabbitConnectionDetailsinto account when falling back from stream-specific configuration to general Rabbit configuration. I've opened #42489 for that. When fixed, we'll fallback fromspring.rabbit.stream.*properties toRabbitConnectionDetails. With the changes here in place, we'd then fallback fromRabbitStreamConnectionDetails(a replacement for some of thespring.rabbit.stream.*properties) toRabbitConnectionDetails(a replacement for some of the generalspring.rabbit.*properties).There was a problem hiding this comment.
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Thinking about this some more, Rabbit Streams support is deceptively complicated (to me at least) as I think it's the first time where different users may want different things. One user may want
RabbitConnectionDetailsandRabbitStreamConnectionDetailsto be sourced from the same container as their app is using the same Rabbit broker for both streaming and regular messaging. Another user may wantRabbitConnectionDetailsandRabbitStreamConnectionDetailsto be sourced from different containers as their app is using different Rabbit brokers for streaming and regular messaging.With only
RabbitMQContainerto look at, even if we could detect in the container connection details factory that the streams plugin is enabled, we wouldn't know if the user wanted this container to be used only for streams or for both streams and regular messaging. It feels like we may need some other signal to indicate how the container should be used as a source for connection details. This reminds me a bit of the exploratory work being done for SSL and the possibility of having SSL-related annotations on the container field. I'll flag this one for a meeting so I can see what the rest of the team thinks.Uh oh!
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We think we may be able to check to see if the default streams port is exposed by the container. If it isn't, the factory should return
null.We should also think about Docker Compose as, ideally, we'd keep the supported services in sync across Compose and Testcontainers.
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Upon further thought, I'm not sure that this will work for all cases. Those cases are:
In the two container case,
RabbitContainerConnectionDetailsFactorywill match a container with the streams port exposed and I think we'll end up with a duplicate connection details failure. If we madeRabbitContainerConnectionDetailsFactoryignore containers with the streams port exposed it would fix the two container case but it would break the one container case.Some experimentation's needed to see if the above's accurate.