Set AMQP Client Link Max Message Size to 0 for ServiceBus [Eventloop Fix] (#43383)

* changing the max message size on link to 0

* minor changes to send function

* fix for failing test - test_async_queue_mock_no_reusing_auto_lock_renew

* removed send function ( testing)

* nit change

Author: PIRO-V

eng/tools/azure-sdk-tools/devtools_testutils/azure_recorded_testcase.py

@@ -161,7 +161,11 @@ def await_prepared_test(test_fn):
         @functools.wraps(test_fn)
         def run(test_class_instance, *args, **kwargs):
             trim_kwargs_from_test_function(test_fn, kwargs)
-            loop = asyncio.get_event_loop()
+            try:
+                loop = asyncio.get_event_loop()
+            except RuntimeError:
+                loop = asyncio.new_event_loop()
+                asyncio.set_event_loop(loop)
             return loop.run_until_complete(test_fn(test_class_instance, **kwargs))
 
         return run

sdk/servicebus/azure-servicebus/azure/servicebus/_pyamqp/client.py

@@ -46,6 +46,7 @@
     OUTGOING_WINDOW,
     DEFAULT_AUTH_TIMEOUT,
     MESSAGE_DELIVERY_DONE_STATES,
+    LINK_MAX_MESSAGE_SIZE
 )
 
 from .management_operation import ManagementOperation
@@ -576,7 +577,7 @@ class SendClient(AMQPClient):
     def __init__(self, hostname, target, **kwargs):
         self.target = target
         # Sender and Link settings
-        self._max_message_size = kwargs.pop("max_message_size", MAX_FRAME_SIZE_BYTES)
+        self._max_message_size = kwargs.pop("max_message_size", LINK_MAX_MESSAGE_SIZE)
         self._link_properties = kwargs.pop("link_properties", None)
         self._link_credit = kwargs.pop("link_credit", None)
         super(SendClient, self).__init__(hostname, **kwargs)

sdk/servicebus/azure-servicebus/azure/servicebus/_pyamqp/constants.py

@@ -59,6 +59,7 @@
 #: size until they have agreed a definitive maximum frame size for that Connection.
 MIN_MAX_FRAME_SIZE = 512
 MAX_FRAME_SIZE_BYTES = 1024 * 1024
+LINK_MAX_MESSAGE_SIZE = 0
 MAX_CHANNELS = 65535
 INCOMING_WINDOW = 64 * 1024
 OUTGOING_WINDOW = 64 * 1024