Azure · l0lawrence · Feb 2, 2024 · Jun 21, 2023 · Jun 22, 2023 · Jul 5, 2023
@@ -425,6 +425,14 @@ def _do_retryable_operation(
                         self._container_id,
                         last_exception,
                     )
+                    if isinstance(last_exception, OperationTimeoutError):
+                        description = "If trying to receive from NEXT_AVAILABLE_SESSION, "\
+                            "use max_wait_time on the ServiceBusReceiver to control the"\
+                                " timeout."
+                        error = OperationTimeoutError(
+                            message=description,
+                        )
+                        raise error from last_exception
                     raise last_exception from None
                 self._backoff(
                     retried_times=retried_times,
@@ -461,6 +469,15 @@ def _backoff(
                 entity_name,
                 last_exception,
             )
+            if isinstance(last_exception, OperationTimeoutError):
+                description = "If trying to receive from NEXT_AVAILABLE_SESSION, "\
+                    "use max_wait_time on the ServiceBusReceiver to control the"\
+                        " timeout."
+                error = OperationTimeoutError(
+                    message=description,
+                )
+
+                raise error from last_exception
             raise last_exception
 
     def _mgmt_request_response(

@@ -61,6 +61,7 @@
 CONSUMER_IDENTIFIER = VENDOR + b":receiver-name"
 UAMQP_LIBRARY = "uamqp"
 PYAMQP_LIBRARY = "pyamqp"
+OPERATION_TIMEOUT = VENDOR + b":timeout"
 
 MANAGEMENT_PATH_SUFFIX = "/$management"
 

@@ -356,10 +356,12 @@ def get_queue_receiver(
          will be immediately removed from the queue, and cannot be subsequently rejected or re-received if
          the client fails to process the message. The default receive_mode is PEEK_LOCK.
         :paramtype receive_mode: Union[~azure.servicebus.ServiceBusReceiveMode, str]
-        :keyword Optional[float] max_wait_time: The timeout in seconds between received messages after which the
-         receiver will automatically stop receiving. The default value is None, meaning no timeout. If connection
-         errors are occurring due to write timing out, the connection timeout value may need to be adjusted. See
-         the `socket_timeout` optional parameter for more details.
+        :keyword Optional[float] max_wait_time:  The timeout in seconds to wait for the first and subsequent
+         messages to arrive. If no messages arrive, and no timeout is specified, this call will not return
+         until the connection is closed. The default value is None, meaning no timeout. On a sessionful
+         queue/topic when NEXT_AVAILABLE_SESSION is specified, this will act as the timeout for connecting.
+         If connection errors are occurring due to write timing out,the connection timeout
+         value may need to be adjusted. See the `socket_timeout` optional parameter for more details.
         :keyword Optional[~azure.servicebus.AutoLockRenewer] auto_lock_renewer: An ~azure.servicebus.AutoLockRenewer
          can be provided such that messages are automatically registered on receipt. If the receiver is a session
          receiver, it will apply to the session instead.
@@ -546,10 +548,12 @@ def get_subscription_receiver(
          will be immediately removed from the subscription, and cannot be subsequently rejected or re-received if
          the client fails to process the message. The default receive_mode is PEEK_LOCK.
         :paramtype receive_mode: Union[~azure.servicebus.ServiceBusReceiveMode, str]
-        :keyword Optional[float] max_wait_time: The timeout in seconds between received messages after which the
-         receiver will automatically stop receiving. The default value is None, meaning no timeout. If connection
-         errors are occurring due to write timing out, the connection timeout value may need to be adjusted. See
-         the `socket_timeout` optional parameter for more details.
+        :keyword Optional[float] max_wait_time:  The timeout in seconds to wait for the first and subsequent
+         messages to arrive. If no messages arrive, and no timeout is specified, this call will not return
+         until the connection is closed. The default value is None, meaning no timeout. On a sessionful
+         queue/topic when NEXT_AVAILABLE_SESSION is specified, this will act as the timeout for connecting.
+         If connection errors are occurring due to write timing out,the connection timeout
+         value may need to be adjusted. See the `socket_timeout` optional parameter for more details.
         :keyword Optional[~azure.servicebus.AutoLockRenewer] auto_lock_renewer: An ~azure.servicebus.AutoLockRenewer
          can be provided such that messages are automatically registered on receipt. If the receiver is a session
          receiver, it will apply to the session instead.

@@ -105,8 +105,12 @@ class ServiceBusReceiver(
      the client connects to.
     :keyword str subscription_name: The path of specific Service Bus Subscription under the
      specified Topic the client connects to.
-    :keyword Optional[float] max_wait_time: The timeout in seconds between received messages after which the
-     receiver will automatically stop receiving. The default value is None, meaning no timeout.
+    :keyword Optional[float] max_wait_time:  The timeout in seconds to wait for the first and subsequent
+     messages to arrive. If no messages arrive, and no timeout is specified, this call will not return
+     until the connection is closed. The default value is None, meaning no timeout. On a sessionful
+     queue/topic when NEXT_AVAILABLE_SESSION is specified, this will act as the timeout for connecting
+     to a session. If connection errors are occurring due to write timing out,the connection timeout
+     value may need to be adjusted. See the `socket_timeout` optional parameter for more details.
     :keyword receive_mode: The mode with which messages will be retrieved from the entity. The two options
      are PEEK_LOCK and RECEIVE_AND_DELETE. Messages received with PEEK_LOCK must be settled within a given
      lock period before they will be removed from the queue. Messages received with RECEIVE_AND_DELETE
@@ -296,8 +300,12 @@ def _from_connection_string(
          if the client fails to process the message.
          The default mode is PEEK_LOCK.
         :paramtype receive_mode: Union[~azure.servicebus.ServiceBusReceiveMode, str]
-        :keyword Optional[float] max_wait_time: The timeout in seconds between received messages after which the
-         receiver will automatically stop receiving. The default value is None, meaning no timeout.
+        :keyword Optional[float] max_wait_time:  The timeout in seconds to wait for the first and subsequent
+         messages to arrive. If no messages arrive, and no timeout is specified, this call will not return
+         until the connection is closed. The default value is None, meaning no timeout. On a sessionful
+         queue/topic when NEXT_AVAILABLE_SESSION is specified, this will act as the timeout for connecting
+         to a session. If connection errors are occurring due to write timing out,the connection timeout
+         value may need to be adjusted. See the `socket_timeout` optional parameter for more details.
         :keyword bool logging_enable: Whether to output network trace logs to the logger. Default is `False`.
         :keyword transport_type: The type of transport protocol that will be used for communicating with
          the Service Bus service. Default is `TransportType.Amqp`.
@@ -668,8 +676,10 @@ def receive_messages(
          Setting to None will fully depend on the prefetch config. The default value is 1.
         :param Optional[float] max_wait_time: Maximum time to wait in seconds for the first message to arrive.
          If no messages arrive, and no timeout is specified, this call will not return
-         until the connection is closed. If specified, an no messages arrive within the
-         timeout period, an empty list will be returned.
+         until the connection is closed. If specified, and no messages arrive within the
+         timeout period, an empty list will be returned. NOTE: Setting max_wait_time on receive_messages
+         when NEXT_AVAILABLE_SESSION is specified will not impact the timeout for connecting to a session.
+         Please use max_wait_time on the constructor to set the timeout for connecting to a session.
         :return: A list of messages received. If no messages are available, this will be an empty list.
         :rtype: List[~azure.servicebus.ServiceBusReceivedMessage]
 

@@ -5,6 +5,8 @@
 # pylint: disable=too-many-lines
 import functools
 import time
+import math
+import random
 import datetime
 from datetime import timezone
 from typing import Optional, Tuple, cast, List, TYPE_CHECKING, Any, Callable, Dict, Union, Iterator, Type
@@ -66,6 +68,8 @@
     ERROR_CODE_ENTITY_ALREADY_EXISTS,
     ERROR_CODE_PRECONDITION_FAILED,
     ServiceBusReceiveMode,
+    OPERATION_TIMEOUT,
+    NEXT_AVAILABLE_SESSION,
 )
 
 from ..exceptions import (
@@ -576,6 +580,28 @@ def create_receive_client(
         config = receiver._config   # pylint: disable=protected-access
         source = kwargs.pop("source")
         receive_mode = kwargs.pop("receive_mode")
+        link_properties = kwargs.pop("link_properties")
+
+        # When NEXT_AVAILABLE_SESSION is set, the default time to wait to connect to a session is 65 seconds.
+        # If there are no messages in the topic/queue the client will wait for 65 seconds for an AttachFrame
+        # frame from the service before raising an OperationTimeoutError due to failure to connect.
+        # max_wait_time, if specified, will allow the user to wait for fewer or more than 65 seconds to
+        # connect to a session.
+        if receiver._session_id == NEXT_AVAILABLE_SESSION and receiver._max_wait_time: # pylint: disable=protected-access
+            timeout_in_ms = receiver._max_wait_time * 1000 # pylint: disable=protected-access
+            open_receive_link_base_jitter_in_ms = 100
+            open_recieve_link_buffer_in_ms = 20
+            open_receive_link_buffer_threshold_in_ms = 1000
+            jitter_base_in_ms = min(timeout_in_ms * 0.01, open_receive_link_base_jitter_in_ms)
+            timeout_in_ms = math.floor(timeout_in_ms - jitter_base_in_ms * random.random())
+            if timeout_in_ms >= open_receive_link_buffer_threshold_in_ms:
+                timeout_in_ms -= open_recieve_link_buffer_in_ms
+
+            # If we have specified a client-side timeout, assure that it is encoded as an uint
+            link_properties[OPERATION_TIMEOUT] = amqp_uint_value(timeout_in_ms)
+
+        kwargs["link_properties"] = link_properties
+
         return ReceiveClient(
             config.hostname,
             source,

@@ -274,6 +274,14 @@ async def _do_retryable_operation(
                         self._container_id,
                         last_exception,
                     )
+                    if isinstance(last_exception, OperationTimeoutError):
+                        description = "If trying to receive from NEXT_AVAILABLE_SESSION, "\
+                            "use max_wait_time on the ServiceBusReceiver to control the"\
+                                " timeout."
+                        error = OperationTimeoutError(
+                            message=description,
+                        )
+                        raise error from last_exception
                     raise last_exception from None
                 await self._backoff(
                     retried_times=retried_times,
@@ -306,6 +314,14 @@ async def _backoff(
                 entity_name,
                 last_exception,
             )
+            if isinstance(last_exception, OperationTimeoutError):
+                description = "If trying to receive from NEXT_AVAILABLE_SESSION, "\
+                    "use max_wait_time on the ServiceBusReceiver to control the"\
+                        " timeout."
+                error = OperationTimeoutError(
+                    message=description,
+                )
+                raise error from last_exception
             raise last_exception
 
     async def _mgmt_request_response(

@@ -341,10 +341,12 @@ def get_queue_receiver(
          will be immediately removed from the queue, and cannot be subsequently rejected or re-received if
          the client fails to process the message. The default mode is PEEK_LOCK.
         :paramtype receive_mode: Union[~azure.servicebus.ServiceBusReceiveMode, str]
-        :keyword Optional[float] max_wait_time: The timeout in seconds between received messages after which the
-         receiver will automatically stop receiving. The default value is None, meaning no timeout. If connection
-         errors are occurring due to write timing out, the connection timeout value may need to be adjusted. See
-         the `socket_timeout` optional parameter for more details.
+        :keyword Optional[float] max_wait_time:  The timeout in seconds to wait for the first and subsequent
+         messages to arrive. If no messages arrive, and no timeout is specified, this call will not return
+         until the connection is closed. The default value is None, meaning no timeout. On a sessionful
+         queue/topic when NEXT_AVAILABLE_SESSION is specified, this will act as the timeout for connecting.
+         If connection errors are occurring due to write timing out,the connection timeout
+         value may need to be adjusted. See the `socket_timeout` optional parameter for more details.
         :keyword Optional[~azure.servicebus.aio.AutoLockRenewer] auto_lock_renewer: An
          ~azure.servicebus.aio.AutoLockRenewer can be provided such that messages are automatically registered on
          receipt. If the receiver is a session receiver, it will apply to the session instead.
@@ -520,10 +522,12 @@ def get_subscription_receiver(
          will be immediately removed from the subscription, and cannot be subsequently rejected or re-received if
          the client fails to process the message. The default mode is PEEK_LOCK.
         :paramtype receive_mode: Union[~azure.servicebus.ServiceBusReceiveMode, str]
-        :keyword Optional[float] max_wait_time: The timeout in seconds between received messages after which the
-         receiver will automatically stop receiving. The default value is None, meaning no timeout. If connection
-         errors are occurring due to write timing out, the connection timeout value may need to be adjusted. See
-         the `socket_timeout` optional parameter for more details.
+        :keyword Optional[float] max_wait_time:  The timeout in seconds to wait for the first and subsequent
+         messages to arrive. If no messages arrive, and no timeout is specified, this call will not return
+         until the connection is closed. The default value is None, meaning no timeout. On a sessionful
+         queue/topic when NEXT_AVAILABLE_SESSION is specified, this will act as the timeout for connecting.
+         If connection errors are occurring due to write timing out,the connection timeout
+         value may need to be adjusted. See the `socket_timeout` optional parameter for more details.
         :keyword Optional[~azure.servicebus.aio.AutoLockRenewer] auto_lock_renewer: An
          ~azure.servicebus.aio.AutoLockRenewer can be provided such that messages are automatically registered on
          receipt. If the receiver is a session receiver, it will apply to the session instead.

@@ -117,8 +117,12 @@ class ServiceBusReceiver(AsyncIterator, BaseHandler, ReceiverMixin):
      if the client fails to process the message.
      The default mode is PEEK_LOCK.
     :paramtype receive_mode: Union[~azure.servicebus.ServiceBusReceiveMode, str]
-    :keyword Optional[float] max_wait_time: The timeout in seconds between received messages after which the receiver
-     will automatically stop receiving. The default value is None, meaning no timeout.
+    :keyword Optional[float] max_wait_time:  The timeout in seconds to wait for the first and subsequent
+     messages to arrive. If no messages arrive, and no timeout is specified, this call will not return
+     until the connection is closed. The default value is None, meaning no timeout. On a sessionful
+     queue/topic when NEXT_AVAILABLE_SESSION is specified, this will act as the timeout for connecting
+     to a session. If connection errors are occurring due to write timing out,the connection timeout
+     value may need to be adjusted. See the `socket_timeout` optional parameter for more details.
     :keyword bool logging_enable: Whether to output network trace logs to the logger. Default is `False`.
     :keyword transport_type: The type of transport protocol that will be used for communicating with
      the Service Bus service. Default is `TransportType.Amqp`.
@@ -294,8 +298,12 @@ def _from_connection_string(
          if the client fails to process the message.
          The default mode is PEEK_LOCK.
         :paramtype receive_mode: Union[~azure.servicebus.ServiceBusReceiveMode, str]
-        :keyword Optional[float] max_wait_time: The timeout in seconds between received messages after which the
-         receiver will automatically stop receiving. The default value is None, meaning no timeout.
+        :keyword Optional[float] max_wait_time:  The timeout in seconds to wait for the first and subsequent
+         messages to arrive. If no messages arrive, and no timeout is specified, this call will not return
+         until the connection is closed. The default value is None, meaning no timeout. On a sessionful
+         queue/topic when NEXT_AVAILABLE_SESSION is specified, this will act as the timeout for connecting
+         to a session. If connection errors are occurring due to write timing out,the connection timeout
+         value may need to be adjusted. See the `socket_timeout` optional parameter for more details.
         :keyword bool logging_enable: Whether to output network trace logs to the logger. Default is `False`.
         :keyword transport_type: The type of transport protocol that will be used for communicating with
          the Service Bus service. Default is `TransportType.Amqp`.
@@ -649,7 +657,9 @@ async def receive_messages(
         :param Optional[float] max_wait_time: Maximum time to wait in seconds for the first message to arrive.
          If no messages arrive, and no timeout is specified, this call will not return
          until the connection is closed. If specified, and no messages arrive within the
-         timeout period, an empty list will be returned.
+         timeout period, an empty list will be returned. NOTE: Setting max_wait_time on receive_messages
+         when NEXT_AVAILABLE_SESSION is specified will not impact the timeout for connecting to a session.
+         Please use max_wait_time on the constructor to set the timeout for connecting to a session.
         :return: A list of messages received. If no messages are available, this will be an empty list.
         :rtype: list[~azure.servicebus.aio.ServiceBusReceivedMessage]