kombu.transport.SQS¶
Amazon SQS transport module for Kombu. This package implements an AMQP-like interface on top of Amazons SQS service, with the goal of being optimized for high performance and reliability.
The default settings for this module are focused now on high performance in task queue situations where tasks are small, idempotent and run very fast.
- SQS Features supported by this transport:
- Long Polling:
- http://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/
- sqs-long-polling.html
Long polling is enabled by setting the wait_time_seconds transport option to a number > 1. Amazon supports up to 20 seconds. This is disabled for now, but will be enabled by default in the near future.
- Batch API Actions:
- http://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/
- sqs-batch-api.html
The default behavior of the SQS Channel.drain_events() method is to request up to the ‘prefetch_count’ messages on every request to SQS. These messages are stored locally in a deque object and passed back to the Transport until the deque is empty, before triggering a new API call to Amazon.
This behavior dramatically speeds up the rate that you can pull tasks from SQS when you have short-running tasks (or a large number of workers).
When a Celery worker has multiple queues to monitor, it will pull down up to ‘prefetch_count’ messages from queueA and work on them all before moving on to queueB. If queueB is empty, it will wait up until ‘polling_interval’ expires before moving back and checking on queueA.
Transport¶
-
class
kombu.transport.SQS.
Transport
(client, **kwargs)[source]¶ -
class
Channel
(*args, **kwargs)¶ -
class
Table
(connection=None, name=None)¶ Amazon SimpleDB domain describing the message routing table.
-
create_binding
(queue)¶ Get binding item for queue.
Creates the item if it doesn’t exist.
-
exchange_delete
(exchange)¶ Delete all routes for exchange.
-
get_exchanges
()¶
-
get_item
(item_name)¶ Uses consistent_read by default.
-
get_queue
(queue)¶ Get binding for queue.
-
queue_bind
(exchange, routing_key, pattern, queue)¶
-
queue_delete
(queue)¶ delete queue by name.
-
routes_for
(exchange)¶ Iterator giving all routes for an exchange.
-
select
(query='', next_token=None, consistent_read=True, max_items=None)¶ Uses consistent_read by default.
-
-
Transport.Channel.
basic_ack
(delivery_tag)¶
-
Transport.Channel.
basic_cancel
(consumer_tag)¶
-
Transport.Channel.
basic_consume
(queue, no_ack, *args, **kwargs)¶
-
Transport.Channel.
close
()¶
-
Transport.Channel.
conninfo
¶
-
Transport.Channel.
default_region
= 'us-east-1'¶
-
Transport.Channel.
default_visibility_timeout
= 1800¶
-
Transport.Channel.
default_wait_time_seconds
= 0¶
-
Transport.Channel.
domain_format
= 'kombu%(vhost)s'¶
-
Transport.Channel.
drain_events
(timeout=None)¶ Return a single payload message from one of our queues.
Raises: Empty – if no messages available.
-
Transport.Channel.
entity_name
(name, table={33: 95, 34: 95, 35: 95, 36: 95, 37: 95, 38: 95, 39: 95, 40: 95, 41: 95, 42: 95, 43: 95, 44: 95, 46: 45, 47: 95, 58: 95, 59: 95, 60: 95, 61: 95, 62: 95, 63: 95, 64: 95, 91: 95, 92: 95, 93: 95, 94: 95, 96: 95, 123: 95, 124: 95, 125: 95, 126: 95})¶ Format AMQP queue name into a legal SQS queue name.
-
Transport.Channel.
exchange_delete
(exchange, **kwargs)¶ Delete exchange by name.
-
Transport.Channel.
get_exchanges
()¶
-
Transport.Channel.
get_table
(exchange)¶ Get routing table.
Retrieved from SDB if
supports_fanout
.
-
Transport.Channel.
queue_bind
(queue, exchange=None, routing_key='', arguments=None, **kwargs)¶
-
Transport.Channel.
queue_name_prefix
¶
-
Transport.Channel.
region
¶
-
Transport.Channel.
sdb
¶
-
Transport.Channel.
sqs
¶
-
Transport.Channel.
supports_fanout
¶
-
Transport.Channel.
table
¶
-
Transport.Channel.
transport_options
¶
-
Transport.Channel.
visibility_timeout
¶
-
Transport.Channel.
wait_time_seconds
¶
-
class
-
Transport.
channel_errors
= (<class 'amqp.exceptions.ChannelError'>, <class 'boto.exception.SQSDecodeError'>)¶
-
Transport.
connection_errors
= (<class 'amqp.exceptions.ConnectionError'>, <class 'boto.exception.SQSError'>, <class 'socket.error'>)¶
-
Transport.
default_port
= None¶
-
Transport.
driver_name
= 'sqs'¶
-
Transport.
driver_type
= 'sqs'¶
-
Transport.
polling_interval
= 1¶
-
Transport.
wait_time_seconds
= 0¶
-
class
Channel¶
-
class
kombu.transport.SQS.
Channel
(*args, **kwargs)[source]¶ -
class
Table
(connection=None, name=None)¶ Amazon SimpleDB domain describing the message routing table.
-
create_binding
(queue)¶ Get binding item for queue.
Creates the item if it doesn’t exist.
-
exchange_delete
(exchange)¶ Delete all routes for exchange.
-
get_exchanges
()¶
-
get_item
(item_name)¶ Uses consistent_read by default.
-
get_queue
(queue)¶ Get binding for queue.
-
queue_bind
(exchange, routing_key, pattern, queue)¶
-
queue_delete
(queue)¶ delete queue by name.
-
routes_for
(exchange)¶ Iterator giving all routes for an exchange.
-
select
(query='', next_token=None, consistent_read=True, max_items=None)¶ Uses consistent_read by default.
-
-
Channel.
conninfo
¶
-
Channel.
default_region
= 'us-east-1'¶
-
Channel.
default_visibility_timeout
= 1800¶
-
Channel.
default_wait_time_seconds
= 0¶
-
Channel.
domain_format
= 'kombu%(vhost)s'¶
-
Channel.
drain_events
(timeout=None)[source]¶ Return a single payload message from one of our queues.
Raises: Empty – if no messages available.
-
Channel.
entity_name
(name, table={33: 95, 34: 95, 35: 95, 36: 95, 37: 95, 38: 95, 39: 95, 40: 95, 41: 95, 42: 95, 43: 95, 44: 95, 46: 45, 47: 95, 58: 95, 59: 95, 60: 95, 61: 95, 62: 95, 63: 95, 64: 95, 91: 95, 92: 95, 93: 95, 94: 95, 96: 95, 123: 95, 124: 95, 125: 95, 126: 95})[source]¶ Format AMQP queue name into a legal SQS queue name.
-
Channel.
get_table
(exchange)[source]¶ Get routing table.
Retrieved from SDB if
supports_fanout
.
-
Channel.
sdb
¶
-
Channel.
sqs
¶
-
Channel.
table
¶
-
Channel.
transport_options
¶
-
class