Add an SQS transport option for custom botocore config

kombu/transport/SQS.py

@@ -58,6 +58,19 @@ Other Features supported by this transport:
         },
       }
     }
+
+  Client config:
+    In some cases you may need to override the botocore config. You can do it
+    as follows:
+
+    transport_option = {
+      'client-config': {
+          'connect_timeout': 5,
+       },
+    }
+
+    For a complete list of settings you can adjust using this option see
+    https://botocore.amazonaws.com/v1/documentation/api/latest/reference/config.html
 """  # noqa: E501
 
 from __future__ import absolute_import, unicode_literals
@@ -67,6 +80,7 @@ import socket
 import string
 import uuid
 
+from botocore.client import Config
 from botocore.exceptions import ClientError
 from vine import transform, ensure_promise, promise
 
@@ -518,7 +532,9 @@ class Channel(virtual.Channel):
         }
         if self.endpoint_url is not None:
             client_kwargs['endpoint_url'] = self.endpoint_url
-        return session.client('sqs', **client_kwargs)
+        client_config = self.transport_options.get('client-config') or {}
+        config = Config(**client_config)
+        return session.client('sqs', config=config, **client_kwargs)
 
     def sqs(self, queue=None):
         if queue is not None and self.predefined_queues:

t/unit/transport/test_SQS.py

@@ -275,6 +275,19 @@ class test_Channel:
         # For cleanup purposes, delete the queue and the queue file
         self.channel._delete(queue_name)
 
+    def test_botocore_config_override(self):
+        expected_connect_timeout = 5
+        client_config = {'connect_timeout': expected_connect_timeout}
+        self.connection = Connection(
+            transport=SQS.Transport,
+            transport_options={'client-config': client_config},
+        )
+        self.channel = self.connection.channel()
+        self.channel._sqs = None
+        boto3_sqs = SQS_Channel_sqs.__get__(self.channel, SQS.Channel)
+        botocore_config = boto3_sqs()._client_config
+        assert botocore_config.connect_timeout == expected_connect_timeout
+
     def test_dont_create_duplicate_new_queue(self):
         # All queue names start with "q", except "unittest_queue".
         # which is definitely out of cache when get_all_queues returns the