Drop overflow in loop for stream_queue to make sure max-age is respected

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 
 - Don't update user's password hash if given password is the same as current [#586](https://github.com/cloudamqp/lavinmq/pull/586)
+- Remove old segments in the background for stream queues [#608](https://github.com/cloudamqp/lavinmq/pull/608)
 
 ## [1.2.5] - 2023-11-06
 

src/lavinmq/queue/stream_queue.cr

@@ -8,7 +8,7 @@ module LavinMQ
                    @exclusive = false, @auto_delete = false,
                    @arguments = AMQP::Table.new)
       super
-      spawn unmap_unused_segments_loop, name: "StreamQueue#unmap_unused_segments_loop"
+      spawn unmap_and_remove_segments_loop, name: "StreamQueue#unmap_and_remove_segments_loop"
     end
 
     def apply_policy(policy : Policy?, operator_policy : OperatorPolicy?)
@@ -146,21 +146,22 @@ module LavinMQ
       end
     end
 
-    private def unmap_unused_segments_loop
+    private def unmap_and_remove_segments_loop
       until closed?
         sleep 60
-        unmap_unused_segments
+        unmap_and_remove_segments
       end
     end
 
-    private def unmap_unused_segments
+    private def unmap_and_remove_segments
       used_segments = Set(UInt32).new
       @consumers_lock.synchronize do
         @consumers.each do |consumer|
           used_segments << consumer.as(Client::Channel::StreamConsumer).segment
         end
       end
       @msg_store_lock.synchronize do
+        stream_queue_msg_store.drop_overflow
         stream_queue_msg_store.unmap_segments(except: used_segments)
       end
     end