Pika

[GitHub milestone](https://github.com/pika/pika/milestone/9)

[0.11.0](https://github.com/pika/pika/compare/0.10.0...0.11.0)

> - Simplify Travis CI configuration for OS X.
> - Add [asyncio]{.title-ref} connection adapter for Python 3.4 and
> newer.
> - Connection failures that occur after the socket is opened and
> before the AMQP connection is ready to go are now reported by
> calling the connection error callback. Previously these were not
> consistently reported.
> - In BaseConnection.close, call \_handle_ioloop_stop only if the
> connection is already closed to allow the asynchronous close
> operation to complete gracefully.
> - Pass error information from failed socket connection to user
> callbacks on_open_error_callback and on_close_callback with
> result_code=-1.
> - ValueError is raised when a completion callback is passed to an
> asynchronous (nowait) Channel operation. It\'s an application
> error to pass a non-None completion callback with an asynchronous
> request, because this callback can never be serviced in the
> asynchronous scenario.
> - [Channel.basic_reject]{.title-ref} fixed to allow
> [delivery_tag]{.title-ref} to be of type [long]{.title-ref} as
> well as [int]{.title-ref}. (by quantum5)
> - Implemented support for blocked connection timeouts in
> [pika.connection.Connection]{.title-ref}. This feature is
> available to all pika adapters. See
> [pika.connection.ConnectionParameters]{.title-ref} docstring to
> learn more about [blocked_connection_timeout]{.title-ref}
> configuration.
> - Deprecated the [heartbeat_interval]{.title-ref} arg in
> [pika.ConnectionParameters]{.title-ref} in favor of the
> [heartbeat]{.title-ref} arg for consistency with the other
> connection parameters classes
> [pika.connection.Parameters]{.title-ref} and
> [pika.URLParameters]{.title-ref}.
> - When the [port]{.title-ref} arg is not set explicitly in
> [ConnectionParameters]{.title-ref} constructor, but the
> [ssl]{.title-ref} arg is set explicitly, then set the port value
> to to the default AMQP SSL port if SSL is enabled, otherwise to
> the default AMQP plaintext port.
> - [URLParameters]{.title-ref} will raise ValueError if a non-empty
> URL scheme other than {amqp \| amqps \| http \| https} is
> specified.
> - [InvalidMinimumFrameSize]{.title-ref} and
> [InvalidMaximumFrameSize]{.title-ref} exceptions are deprecated.
> pika.connection.Parameters.frame_max property setter now raises
> the standard [ValueError]{.title-ref} exception when the value is
> out of bounds.
> - Removed deprecated parameter [type]{.title-ref} in
> [Channel.exchange_declare]{.title-ref} and
> [BlockingChannel.exchange_declare]{.title-ref} in favor of the
> [exchange_type]{.title-ref} arg that doesn\'t overshadow the
> builtin [type]{.title-ref} keyword.
> - Channel.close() on OPENING channel transitions it to CLOSING
> instead of raising ChannelClosed.
> - Channel.close() on CLOSING channel raises
> [ChannelAlreadyClosing]{.title-ref}; used to raise
> [ChannelClosed]{.title-ref}.
> - Connection.channel() raises [ConnectionClosed]{.title-ref} if
> connection is not in OPEN state.
> - When performing graceful close on a channel and
> [Channel.Close]{.title-ref} from broker arrives while waiting for
> CloseOk, don\'t release the channel number until CloseOk arrives
> to avoid race condition that may lead to a new channel receiving
> the CloseOk that was destined for the closing channel.
> - The [backpressure_detection]{.title-ref} option of
> [ConnectionParameters]{.title-ref} and [URLParameters]{.title-ref}
> property is DEPRECATED in favor of
> [Connection.Blocked]{.title-ref} and
> [Connection.Unblocked]{.title-ref}. See
> [Connection.add_on_connection_blocked_callback]{.title-ref}.

[0.10.0](https://github.com/pika/pika/compare/0.9.14...0.10.0)

> - a9bf96d - LibevConnection: Fixed dict chgd size during iteration
> (Michael Laing)
> - 388c55d - SelectConnection: Fixed KeyError exceptions in IOLoop
> timeout executions (Shinji Suzuki)
> - 4780de3 - BlockingConnection: Add support to make
> BlockingConnection a Context Manager (reddec)

> - f72b58f - Fixed failure to purge \_ConsumerCancellationEvt from
> BlockingChannel.\_pending_events during basic_cancel. (Vitaly
> Kruglikov)

High-level summary of notable changes:

- Change to 3-Clause BSD License
- Python 3.x support
- Over 150 commits from 19 contributors
- Refactoring of SelectConnection ioloop
- This major release contains certain non-backward-compatible API
changes as well as significant performance improvements in the
[BlockingConnection]{.title-ref} adapter.
- Non-backward-compatible changes in
[Channel.add_on_return_callback]{.title-ref} callback\'s signature.
- The [AsyncoreConnection]{.title-ref} adapter was retired

**Details**

Python 3.x: this release introduces python 3.x support. Tested on Python
3.3 and 3.4.

\`AsyncoreConnection\`: Retired this legacy adapter to reduce
maintenance burden; the recommended replacement is the
[SelectConnection]{.title-ref} adapter.

\`SelectConnection\`: ioloop was refactored for compatibility with other
ioloops.

\`Channel.add_on_return_callback\`: The callback is now passed the
individual parameters channel, method, properties, and body instead of a
tuple of those values for congruence with other similar callbacks.

\`BlockingConnection\`: This adapter underwent a makeover under the hood
and gained significant performance improvements as well as enhanced
timer resolution. It is now implemented as a client of the
[SelectConnection]{.title-ref} adapter.

Below is an overview of the [BlockingConnection]{.title-ref} and
[BlockingChannel]{.title-ref} API changes:

> - Recursion: the new implementation eliminates callback recursion
> that sometimes blew out the stack in the legacy implementation
> (e.g., publish -\> consumer_callback -\> publish -\>
> consumer_callback, etc.). While
> [BlockingConnection.process_data_events]{.title-ref} and
> [BlockingConnection.sleep]{.title-ref} may still be called from
> the scope of the blocking adapter\'s callbacks in order to process
> pending I/O, additional callbacks will be suppressed whenever
> [BlockingConnection.process_data_events]{.title-ref} and
> [BlockingConnection.sleep]{.title-ref} are nested in any
> combination; in that case, the callback information will be
> bufferred and dispatched once nesting unwinds and control returns
> to the level-zero dispatcher.
>
> - \`BlockingConnection.connect\`: this method was removed in favor
> of the constructor as the only way to establish connections; this
> reduces maintenance burden, while improving reliability of the
> adapter.
>
> - \`BlockingConnection.process_data_events\`: added the optional
> parameter [time_limit]{.title-ref}.
>
> - \`BlockingConnection.add_on_close_callback\`: removed; legacy
> raised [NotImplementedError]{.title-ref}.
>
> - \`BlockingConnection.add_on_open_callback\`: removed; legacy
> raised [NotImplementedError]{.title-ref}.
>
> - \`BlockingConnection.add_on_open_error_callback\`: removed; legacy
> raised [NotImplementedError]{.title-ref}.
>
> - \`BlockingConnection.add_backpressure_callback\`: not supported
>
> - \`BlockingConnection.set_backpressure_multiplier\`: not supported
>
> - \`BlockingChannel.add_on_flow_callback\`: not supported; per
> docstring in channel.py: \"Note that newer versions of RabbitMQ
> will not issue this but instead use TCP backpressure\".
>
> - \`BlockingChannel.flow\`: not supported
>
> - \`BlockingChannel.force_data_events\`: removed as it is no longer
> necessary following redesign of the adapter.
>
> - Removed the [nowait]{.title-ref} parameter from
> [BlockingChannel]{.title-ref} methods, forcing
> [nowait=False]{.title-ref} (former API default) in the
> implementation; this is more suitable for the blocking nature of
> the adapter and its error-reporting strategy; this concerns the
> following methods: [basic_cancel]{.title-ref},
> [confirm_delivery]{.title-ref}, [exchange_bind]{.title-ref},
> [exchange_declare]{.title-ref}, [exchange_delete]{.title-ref},
> [exchange_unbind]{.title-ref}, [queue_bind]{.title-ref},
> [queue_declare]{.title-ref}, [queue_delete]{.title-ref}, and
> [queue_purge]{.title-ref}.
>
> - \`BlockingChannel.basic_cancel\`: returns a sequence instead of
> None; for a [no_ack=True]{.title-ref} consumer,
> [basic_cancel]{.title-ref} returns a sequence of pending messages
> that arrived before broker confirmed the cancellation.
>
> - \`BlockingChannel.consume\`: added new optional kwargs
> [arguments]{.title-ref} and [inactivity_timeout]{.title-ref}.
> Also, raises ValueError if the consumer creation parameters don\'t
> match those used to create the existing queue consumer generator,
> if any; this happens when you break out of the consume loop, then
> call [BlockingChannel.consume]{.title-ref} again with different
> consumer-creation args without first cancelling the previous queue
> consumer generator via [BlockingChannel.cancel]{.title-ref}. The
> legacy implementation would silently resume consuming from the
> existing queue consumer generator even if the subsequent
> [BlockingChannel.consume]{.title-ref} was invoked with a different
> queue name, etc.
>
> - \`BlockingChannel.cancel\`: returns 0; the legacy implementation
> tried to return the number of requeued messages, but this number
> was not accurate as it didn\'t include the messages returned by
> the Channel class; this count is not generally useful, so
> returning 0 is a reasonable replacement.
>
> - \`BlockingChannel.open\`: removed in favor of having a single
> mechanism for creating a channel
> ([BlockingConnection.channel]{.title-ref}); this reduces
> maintenance burden, while improving reliability of the adapter.
>
> - \`BlockingChannel.confirm_delivery\`: raises UnroutableError when
> unroutable messages that were sent prior to this call are returned
> before we receive Confirm.Select-ok.
>
> - [BlockingChannel.basic_publish: always returns True when delivery
> confirmation is not enabled (publisher-acks = off); the legacy
> implementation returned a bool in this case if
> \`mandatory=True]{.title-ref} to indicate whether the message was
> delivered; however, this was non-deterministic, because
> Basic.Return is asynchronous and there is no way to know how long
> to wait for it or its absence. The legacy implementation returned
> None when publishing with publisher-acks = off and
> [mandatory=False]{.title-ref}. The new implementation always
> returns True when publishing while publisher-acks = off.
>
> -
>
> \`BlockingChannel.publish\`: a new alternate method (vs. [basic_publish]{.title-ref}) for
>
> : publishing a message with more detailed error reporting via
> UnroutableError and NackError exceptions.
>
> - \`BlockingChannel.start_consuming\`: raises
> pika.exceptions.RecursionError if called from the scope of a
> [BlockingConnection]{.title-ref} or [BlockingChannel]{.title-ref}
> callback.
>
> - \`BlockingChannel.get_waiting_message_count\`: new method; returns
> the number of messages that may be retrieved from the current
> queue consumer generator via [BasicChannel.consume]{.title-ref}
> without blocking.

**Commits**

> - 5aaa753 - Fixed SSL import and removed no_ack=True in favor of
> explicit AMQP message handling based on deferreds (skftn)
> - 7f222c2 - Add checkignore for codeclimate (Gavin M. Roy)
> - 4dec370 - Implemented BlockingChannel.flow; Implemented
> BlockingConnection.add_on_connection_blocked_callback; Implemented
> BlockingConnection.add_on_connection_unblocked_callback. (Vitaly
> Kruglikov)
> - 4804200 - Implemented blocking adapter acceptance test for
> exchange-to-exchange binding. Added rudimentary validation of
> BasicProperties passthru in blocking adapter publish tests.
> Updated CHANGELOG. (Vitaly Kruglikov)
> - 4ec07fd - Fixed sending of data in TwistedProtocolConnection
> (Vitaly Kruglikov)
> - a747fb3 - Remove my copyright from forward_server.py test utility.
> (Vitaly Kruglikov)
> - 94246d2 - Return True from basic_publish when pubacks is off.
> Implemented more blocking adapter accceptance tests. (Vitaly
> Kruglikov)
> - 3ce013d - PIKA-609 Wait for broker to dispatch all messages to
> client before cancelling consumer in
> TestBasicCancelWithNonAckableConsumer and
> TestBasicCancelWithAckableConsumer (Vitaly Kruglikov)
> - 293f778 - Created CHANGELOG entry for release 0.10.0. Fixed up
> callback documentation for basic_get, basic_consume, and
> add_on_return_callback. (Vitaly Kruglikov)
> - 16d360a - Removed the legacy AsyncoreConnection adapter in favor
> of the recommended SelectConnection adapter. (Vitaly Kruglikov)
> - 240a82c - Defer creation of poller\'s event loop interrupt socket
> pair until start is called, because some SelectConnection users
> (e.g., BlockingConnection adapter) don\'t use the event loop, and
> these sockets would just get reported as resource leaks. (Vitaly
> Kruglikov)
> - aed5cae - Added EINTR loops in select_connection pollers.
> Addressed some pylint findings, including an error or two. Wrap
> socket.send and socket.recv calls in EINTR loops Use the correct
> exception for socket.error and select.error and get errno
> depending on python version. (Vitaly Kruglikov)
> - 498f1be - Allow passing exchange, queue and routing_key as text,
> handle short strings as text in python3 (saarni)
> - 9f7f243 - Restored basic_consume, basic_cancel, and
> add_on_cancel_callback (Vitaly Kruglikov)
> - 18c9909 - Reintroduced BlockingConnection.process_data_events.
> (Vitaly Kruglikov)
> - 4b25cb6 - Fixed BlockingConnection/BlockingChannel acceptance and
> unit tests (Vitaly Kruglikov)
> - bfa932f - Facilitate proper connection state after
> BasicConnection.\_adapter_disconnect (Vitaly Kruglikov)
> - 9a09268 - Fixed BlockingConnection test that was failing with
> ConnectionClosed error. (Vitaly Kruglikov)
> - 5a36934 - Copied synchronous_connection.py from pika-synchronous
> branch Fixed pylint findings Integrated SynchronousConnection with
> the new ioloop in SelectConnection Defined dedicated message
> classes PolledMessage and ConsumerMessage and moved from
> BlockingChannel to module-global scope. Got rid of nowait args
> from BlockingChannel public API methods Signal unroutable messages
> via UnroutableError exception. Signal Nack\'ed messages via
> NackError exception. These expose more information about the
> failure than legacy basic_publich API. Removed set_timeout and
> backpressure callback methods Restored legacy
> [is_open]{.title-ref}, etc. property names (Vitaly Kruglikov)
> - 6226dc0 - Remove deprecated \--use-mirrors (Gavin M. Roy)
> - 1a7112f - Raise ConnectionClosed when sending a frame with no
> connection (439) (Gavin M. Roy)
> - 9040a14 - Make delivery_tag non-optional (498) (Gavin M. Roy)
> - 86aabc2 - Bump version (Gavin M. Roy)
> - 562075a - Update a few testing things (Gavin M. Roy)
> - 4954d38 - use unicode_type in blocking_connection.py (Antti
> Haapala)
> - 133d6bc - Let Travis install ordereddict for Python 2.6, and ttest

[0.9.14](https://github.com/pika/pika/compare/0.9.13...0.9.14)

> - 57fe43e - fix test to generate a correct range of random ints (ml)
> - 0d68dee - fix async watcher for libev_connection (ml)
> - 01710ad - Use default username and password if not specified in
> URLParameters (Sean Dwyer)
> - fae328e - documentation typo (Jeff Fein-Worton)
> - afbc9e0 - libev_connection: reset_io_watcher (ml)
> - 24332a2 - Fix the manifest (Gavin M. Roy)
> - acdfdef - Remove useless test (Gavin M. Roy)
> - 7918e1a - Skip libev tests if pyev is not installed or if they are
> being run in pypy (Gavin M. Roy)
> - bb583bf - Remove the deprecated test (Gavin M. Roy)
> - aecf3f2 - Don\'t reject a message if the channel is not open
> (Gavin M. Roy)
> - e37f336 - Remove UTF-8 decoding in spec (Gavin M. Roy)
> - ddc35a9 - Update the unittest to reflect removal of force binary
> (Gavin M. Roy)
> - fea2476 - PEP8 cleanup (Gavin M. Roy)
> - 9b97956 - Remove force_binary (Gavin M. Roy)
> - a42dd90 - Whitespace required (Gavin M. Roy)
> - 85867ea - Update the content_frame_dispatcher tests to reflect
> removal of auto-cast utf-8 (Gavin M. Roy)
> - 5a4bd5d - Remove unicode casting (Gavin M. Roy)
> - efea53d - Remove force binary and unicode casting (Gavin M. Roy)
> - e918d15 - Add methods to remove deprecation warnings from asyncore
> (Gavin M. Roy)
> - 117f62d - Add a coveragerc to ignore the auto generated pika.spec
> (Gavin M. Roy)
> - 52f4485 - Remove pypy tests from travis for now (Gavin M. Roy)
> - c3aa958 - Update README.rst (Gavin M. Roy)
> - 3e2319f - Delete README.md (Gavin M. Roy)
> - c12b0f1 - Move to RST (Gavin M. Roy)
> - 704f5be - Badging updates (Gavin M. Roy)
> - 7ae33ca - Update for coverage info (Gavin M. Roy)
> - ae7ca86 - add libev_adapter_tests.py; modify .travis.yml to
> install libev and pyev (ml)
> - f86aba5 - libev_connection: add \*\*kwargs to \_handle_event;
> suppress default_ioloop reuse warning (ml)
> - 603f1cf - async_test_base: add necessary args to \_on_cconn_closed
> (ml)
> - 3422007 - add libev_adapter_tests.py (ml)
> - 6cbab0c - removed relative imports and importing urlparse from
> urllib.parse for py3+ (a-tal)
> - f808464 - libev_connection: add async watcher; add optional
> parameters to add_timeout (ml)
> - c041c80 - Remove ev all together for now (Gavin M. Roy)
> - 9408388 - Update the test descriptions and timeout (Gavin M. Roy)
> - 1b552e0 - Increase timeout (Gavin M. Roy)
> - 69a1f46 - Remove the pyev requirement for 2.6 testing (Gavin M.
> Roy)
> - fe062d2 - Update package name (Gavin M. Roy)
> - 611ad0e - Distribute the LICENSE and README.md (350) (Gavin M.
> Roy)
> - df5e1d8 - Ensure that the entire frame is written using
> socket.sendall (349) (Gavin M. Roy)
> - 69ec8cf - Move the libev install to before_install (Gavin M. Roy)
> - a75f693 - Update test structure (Gavin M. Roy)
> - 636b424 - Update things to ignore (Gavin M. Roy)
> - b538c68 - Add tox, nose.cfg, update testing config (Gavin M. Roy)
> - a0e7063 - add some tests to increase coverage of pika.connection
> (Charles Law)
> - c76d9eb - Address issue 459 (Gavin M. Roy)
> - 86ad2db - Raise exception if positional arg for parameters isn\'t
> an instance of Parameters (Gavin M. Roy)
> - 14d08e1 - Fix for python 2.6 (Gavin M. Roy)
> - bd388a3 - Use the first unused channel number addressing 404,
> 460 (Gavin M. Roy)
> - e7676e6 - removing a debug that was left in last commit (James
> Mutton)
> - 6c93b38 - Fixing connection-closed behavior to detect on attempt
> to publish (James Mutton)
> - c3f0356 - Initialize bytes_written in \_handle_write() (Jonathan
> Kirsch)
> - 4510e95 - Fix \_handle_write() may not send full frame (Jonathan
> Kirsch)
> - 12b793f - fixed Tornado Consumer example to successfully reconnect
> (Yang Yang)
> - f074444 - remove forgotten import of ordereddict (Pedro Abranches)
> - 1ba0aea - fix last merge (Pedro Abranches)
> - 10490a6 - change timeouts structure to list to maintain scheduling
> order (Pedro Abranches)
> - 7958394 - save timeouts in ordered dict instead of dict (Pedro
> Abranches)
> - d2746bf - URLParameters and ConnectionParameters accept unicode
> strings (Allard Hoeve)
> - 596d145 - previous fix for AttributeError made parent and child
> class methods identical, remove duplication (James Mutton)
> - 42940dd - UrlParameters Docs: fixed amqps scheme examples
> (Riccardo Cirimelli)
> - 43904ff - Dont test this in PyPy due to sort order issue (Gavin M.
> Roy)
> - d7d293e - Don\'t leave \_\_repr\_\_ sorting up to chance (Gavin M.
> Roy)
> - 848c594 - Add integration test to travis and fix invocation
> (Gavin M. Roy)
> - 2678275 - Add pypy to travis tests (Gavin M. Roy)
> - 1877f3d - Also addresses issue 419 (Gavin M. Roy)
> - 470c245 - Address issue 419 (Gavin M. Roy)
> - ca3cb59 - Address issue 432 (Gavin M. Roy)
> - a3ff6f2 - Default frame max should be AMQP FRAME_MAX (Gavin M.
> Roy)
> - ff3d5cb - Remove max consumer tag test due to change in code.
> (Gavin M. Roy)
> - 6045dda - Catch KeyError (437) to ensure that an exception is not
> raised in a race condition (Gavin M. Roy)
> - 0b4d53a - Address issue 441 (Gavin M. Roy)
> - 180e7c4 - Update license and related files (Gavin M. Roy)
> - 256ed3d - Added Jython support. (Erik Olof Gunnar Andersson)
> - f73c141 - experimental work around for recursion issue. (Erik Olof
> Gunnar Andersson)
> - a623f69 - Prevent 436 by iterating the keys and not the dict
> (Gavin M. Roy)
> - 755fcae - Add support for authentication_failure_close,
> connection.blocked (Gavin M. Roy)
> - c121243 - merge upstream master (Michael Laing)
> - a08dc0d - add arg to channel.basic_consume (Pedro Abranches)
> - 10b136d - Documentation fix (Anton Ryzhov)
> - 9313307 - Fixed minor markup errors. (Jorge Puente Sarrín)
> - fb3e3cf - Fix the spelling of UnsupportedAMQPFieldException
> (Garrett Cooper)
> - 03d5da3 - connection.py: Propagate the force_channel keyword
> parameter to methods involved in channel creation (Michael Laing)
> - 7bbcff5 - Documentation fix for basic_publish (JuhaS)
> - 01dcea7 - Expose no_ack and exclusive to BlockingChannel.consume
> (Jeff Tang)
> - d39b6aa - Fix BlockingChannel.basic_consume does not block on
> non-empty queues (Juhyeong Park)
> - 6e1d295 - fix for issue 391 and issue 307 (Qi Fan)
> - d9ffce9 - Update parameters.rst (cacovsky)
> - 6afa41e - Add additional badges (Gavin M. Roy)
> - a255925 - Fix return value on dns resolution issue (Laurent
> Eschenauer)
> - 3f7466c - libev_connection: tweak docs (Michael Laing)
> - 0aaed93 - libev_connection: Fix varable naming (Michael Laing)
> - 0562d08 - libev_connection: Fix globals warning (Michael Laing)
> - 22ada59 - libev_connection: use globals to track sigint and
> sigterm watchers as they are created globally within libev
> (Michael Laing)
> - 2649b31 - Move badge \[skip ci\] (Gavin M. Roy)
> - f70eea1 - Remove pypy and installation attempt of pyev (Gavin M.
> Roy)
> - f32e522 - Conditionally skip external connection adapters if lib
> is not installed (Gavin M. Roy)
> - cce97c5 - Only install pyev on python 2.7 (Gavin M. Roy)
> - ff84462 - Add travis ci support (Gavin M. Roy)
> - cf971da - lib_evconnection: improve signal handling; add callback
> (Michael Laing)
> - 9adb269 - bugfix in returning a list in Py3k (Alex Chandel)
> - c41d5b9 - update exception syntax for Py3k (Alex Chandel)
> - c8506f1 - fix \_adapter_connect (Michael Laing)
> - 67cb660 - Add LibevConnection to README (Michael Laing)
> - 1f9e72b - Propagate low-level connection errors to the
> AMQPConnectionError. (Bjorn Sandberg)
> - e1da447 - Avoid race condition in \_on_getok on successive
> basic_get() when clearing out callbacks (Jeff)
> - 7a09979 - Add support for upcoming Connection.Blocked/Unblocked
> (Gavin M. Roy)
> - 53cce88 - TwistedChannel correctly handles multi-argument
> deferreds. (eivanov)
> - 66f8ace - Use uuid when creating unique consumer tag (Perttu
> Ranta-aho)
> - 4ee2738 - Limit the growth of Channel.\_cancelled, use deque
> instead of list. (Perttu Ranta-aho)
> - 0369aed - fix adapter references and tweak docs (Michael Laing)
> - 1738c23 - retry select.select() on EINTR (Cenk Alti)
> - 1e55357 - libev_connection: reset internal state on reconnect
> (Michael Laing)
> - 708559e - libev adapter (Michael Laing)
> - a6b7c8b - Prioritize EPollPoller and KQueuePoller over PollPoller
> and SelectPoller (Anton Ryzhov)
> - 53400d3 - Handle socket errors in PollPoller and EPollPoller
> Correctly check \'select.poll\' availability (Anton Ryzhov)
> - a6dc969 - Use dict.keys & items instead of iterkeys & iteritems
> (Alex Chandel)
> - 5c1b0d0 - Use print function syntax, in examples (Alex Chandel)
> - ac9f87a - Fixed a typo in the name of the Asyncore Connection
> adapter (Guruprasad)
> - dfbba50 - Fixed bug mentioned in Issue 357 (Erik Andersson)
> - c906a2d - Drop additional flags when getting info for the
> hostnames, log errors (352) (Gavin M. Roy)
> - baf23dd - retry poll() on EINTR (Cenk Alti)
> - 7cd8762 - Address ticket 352 catching an error when
> socket.getprotobyname fails (Gavin M. Roy)
> - 6c3ec75 - Prep for 0.9.14 (Gavin M. Roy)
> - dae7a99 - Bump to 0.9.14p0 (Gavin M. Roy)
> - 620edc7 - Use default port and virtual host if omitted in
> URLParameters (Issue 342) (Gavin M. Roy)
> - 42a8787 - Move the exception handling inside the while loop
> (Gavin M. Roy)
> - 10e0264 - Fix connection back pressure detection issue 347
> (Gavin M. Roy)
> - 0bfd670 - Fixed mistake in commit 3a19d65. (Erik Andersson)
> - da04bc0 - Fixed Unknown state on disconnect error message
> generated when closing connections. (Erik Andersson)
> - 3a19d65 - Alternative solution to fix 345. (Erik Andersson)
> - abf9fa8 - switch to sendall to send entire frame (Dustin Koupal)
> - 9ce8ce4 - Fixed the async publisher example to work with
> reconnections (Raphaël De Giusti)
> - 511028a - Fix typo in TwistedChannel docstring (cacovsky)
> - 8b69e5a - calls self.\_adapter_disconnect() instead of
> self.disconnect() which doesn\'t actually exist 294 (Mark
> Unsworth)
> - 06a5cf8 - add NullHandler to prevent logging warnings (Cenk Alti)
> - f404a9a - Fix 337 cannot start ioloop after stop (Ralf Nyren)

[0.9.13](https://github.com/pika/pika/compare/0.9.12...0.9.13)

**Major Changes**

- IPv6 Support with thanks to Alessandro Tagliapietra for initial
prototype
- Officially remove support for \<= Python 2.5 even though it was
broken already
- Drop pika.simplebuffer.SimpleBuffer in favor of the Python stdlib
collections.deque object
- New default object for receiving content is a \"bytes\" object which
is a str wrapper in Python 2, but paves way for Python 3 support
- New \"Raw\" mode for frame decoding content frames (334) addresses
issues 331, 229 added by Garth Williamson
- Connection and Disconnection logic refactored, allowing for cleaner
separation of protocol logic and socket handling logic as well as
connection state management
- New \"on_open_error_callback\" argument in creating connection
objects and new Connection.add_on_open_error_callback method
- New Connection.connect method to cleanly allow for reconnection code
- Support for all AMQP field types, using protocol specified
signed/unsigned unpacking

**Backwards Incompatible Changes**

- Method signature for creating connection objects has new argument
\"on_open_error_callback\" which is positionally before
\"on_close_callback\"
- Internal callback variable names in connection.Connection have been
renamed and constants used. If you relied on any of these callbacks
outside of their internal use, make sure to check out the new
constants.
- Connection.\_connect method, which was an internal only method is
now deprecated and will raise a DeprecationWarning. If you relied on
this method, your code needs to change.
- pika.simplebuffer has been removed

**Bugfixes**

- BlockingConnection consumer generator does not free buffer when
exited (328)
- Unicode body payloads in the blocking adapter raises exception
(333)
- Support \"b\" short-short-int AMQP data type (318)
- Docstring type fix in adapters/select_connection (316) fix by
Rikard Hultén
- IPv6 not supported (309)
- Stop the HeartbeatChecker when connection is closed (307)
- Unittest fix for SelectConnection (336) fix by Erik Andersson
- Handle condition where no connection or socket exists but
SelectConnection needs a timeout for retrying a connection (322)
- TwistedAdapter lagging behind BaseConnection changes (321) fix by
Jan Urbański

**Other**

- Refactored documentation
- Added Twisted Adapter example (314) by nolinksoft