Announcing Tornado 4.1
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Ben Darnell
Feb 7, 2015, 1:02:33 PM2/7/15
to Tornado Mailing List, python-torn...@googlegroups.com
I am pleased to announce the release of Tornado 4.0, available from
Release notes:
Many thanks to everyone who contributed patches, bug reports, and feedback that went into this release!
-Ben
-Ben
What's new in Tornado 4.1
=========================
Feb 7, 2015
-----------
Highlights
~~~~~~~~~~
* If a `.Future` contains an exception but that exception is never
examined or re-raised (e.g. by yielding the `.Future`), a stack
trace will be logged when the `.Future` is garbage-collected.
* New class `tornado.gen.WaitIterator` provides a way to iterate
over ``Futures`` in the order they resolve.
* The `tornado.websocket` module now supports compression via the
"permessage-deflate" extension. Override
`.WebSocketHandler.get_compression_options` to enable on the server
side, and use the ``compression_options`` keyword argument to
`.websocket_connect` on the client side.
* When the appropriate packages are installed, it is possible to yield
`asyncio.Future` or Twisted ``Defered`` objects in Tornado coroutines.
Backwards-compatibility notes
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* `.HTTPServer` now calls ``start_request`` with the correct
arguments. This change is backwards-incompatible, afffecting any
application which implemented `.HTTPServerConnectionDelegate` by
following the example of `.Application` instead of the documented
method signatures.
`tornado.concurrent`
~~~~~~~~~~~~~~~~~~~~
* If a `.Future` contains an exception but that exception is never
examined or re-raised (e.g. by yielding the `.Future`), a stack
trace will be logged when the `.Future` is garbage-collected.
* `.Future` now catches and logs exceptions in its callbacks.
``tornado.curl_httpclient``
~~~~~~~~~~~~~~~~~~~~~~~~~~~
* ``tornado.curl_httpclient`` now supports request bodies for ``PATCH``
and custom methods.
* ``tornado.curl_httpclient`` now supports resubmitting bodies after
following redirects for methods other than ``POST``.
* ``curl_httpclient`` now runs the streaming and header callbacks on
the IOLoop.
* ``tornado.curl_httpclient`` now uses its own logger for debug output
so it can be filtered more easily.
`tornado.gen`
~~~~~~~~~~~~~
* New class `tornado.gen.WaitIterator` provides a way to iterate
over ``Futures`` in the order they resolve.
* When the `~functools.singledispatch` library is available (standard on
Python 3.4, available via ``pip install singledispatch`` on older versions),
the `.convert_yielded` function can be used to make other kinds of objects
yieldable in coroutines.
* New function `tornado.gen.sleep` is a coroutine-friendly
analogue to `time.sleep`.
* `.gen.engine` now correctly captures the stack context for its callbacks.
`tornado.httpclient`
~~~~~~~~~~~~~~~~~~~~
* `tornado.httpclient.HTTPRequest` accepts a new argument
``raise_error=False`` to suppress the default behavior of raising an
error for non-200 response codes.
`tornado.httpserver`
~~~~~~~~~~~~~~~~~~~~
* `.HTTPServer` now calls ``start_request`` with the correct
arguments. This change is backwards-incompatible, afffecting any
application which implemented `.HTTPServerConnectionDelegate` by
following the example of `.Application` instead of the documented
method signatures.
* `.HTTPServer` now tolerates extra newlines which are sometimes inserted
between requests on keep-alive connections.
* `.HTTPServer` can now use keep-alive connections after a request
with a chunked body.
* `.HTTPServer` now always reports ``HTTP/1.1`` instead of echoing
the request version.
`tornado.httputil`
~~~~~~~~~~~~~~~~~~
* New function `tornado.httputil.split_host_and_port` for parsing
the ``netloc`` portion of URLs.
* The ``context`` argument to `.HTTPServerRequest` is now optional,
and if a context is supplied the ``remote_ip`` attribute is also optional.
* `.HTTPServerRequest.body` is now always a byte string (previously the default
empty body would be a unicode string on python 3).
* Header parsing now works correctly when newline-like unicode characters
are present.
* Header parsing again supports both CRLF and bare LF line separators.
* Malformed ``multipart/form-data`` bodies will always be logged
quietly instead of raising an unhandled exception; previously
the behavior was inconsistent depending on the exact error.
`tornado.ioloop`
~~~~~~~~~~~~~~~~
* The ``kqueue`` and ``select`` IOLoop implementations now report
writeability correctly, fixing flow control in IOStream.
* When a new `.IOLoop` is created, it automatically becomes "current"
for the thread if there is not already a current instance.
* New method `.PeriodicCallback.is_running` can be used to see
whether the `.PeriodicCallback` has been started.
`tornado.iostream`
~~~~~~~~~~~~~~~~~~
* `.IOStream.start_tls` now uses the ``server_hostname`` parameter
for certificate validation.
* `.SSLIOStream` will no longer consume 100% CPU after certain error conditions.
* `.SSLIOStream` no longer logs ``EBADF`` errors during the handshake as they
can result from nmap scans in certain modes.
`tornado.options`
~~~~~~~~~~~~~~~~~
* `~tornado.options.parse_config_file` now always decodes the config
file as utf8 on Python 3.
* `tornado.options.define` more accurately finds the module defining the
option.
``tornado.platform.asyncio``
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* It is now possible to yield ``asyncio.Future`` objects in coroutines
when the `~functools.singledispatch` library is available and
``tornado.platform.asyncio`` has been imported.
* New methods `tornado.platform.asyncio.to_tornado_future` and
`~tornado.platform.asyncio.to_asyncio_future` convert between
the two libraries' `.Future` classes.
``tornado.platform.twisted``
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* It is now possible to yield ``Deferred`` objects in coroutines
when the `~functools.singledispatch` library is available and
``tornado.platform.twisted`` has been imported.
`tornado.tcpclient`
~~~~~~~~~~~~~~~~~~~
* `.TCPClient` will no longer raise an exception due to an ill-timed
timeout.
`tornado.tcpserver`
~~~~~~~~~~~~~~~~~~~
* `.TCPServer` no longer ignores its ``read_chunk_size`` argument.
`tornado.testing`
~~~~~~~~~~~~~~~~~
* `.AsyncTestCase` has better support for multiple exceptions. Previously
it would silently swallow all but the last; now it raises the first
and logs all the rest.
* `.AsyncTestCase` now cleans up `.Subprocess` state on ``tearDown`` when
necessary.
`tornado.web`
~~~~~~~~~~~~~
* The `.asynchronous` decorator now understands `concurrent.futures.Future`
in addition to `tornado.concurrent.Future`.
* `.StaticFileHandler` no longer logs a stack trace if the connection is
closed while sending the file.
* `.RequestHandler.send_error` now supports a ``reason`` keyword
argument, similar to `tornado.web.HTTPError`.
* `.RequestHandler.locale` now has a property setter.
* `.Application.add_handlers` hostname matching now works correctly with
IPv6 literals.
* Redirects for the `.Application` ``default_host`` setting now match
the request protocol instead of redirecting HTTPS to HTTP.
* Malformed ``_xsrf`` cookies are now ignored instead of causing
uncaught exceptions.
* ``Application.start_request`` now has the same signature as
`.HTTPServerConnectionDelegate.start_request`.
`tornado.websocket`
~~~~~~~~~~~~~~~~~~~
* The `tornado.websocket` module now supports compression via the
"permessage-deflate" extension. Override
`.WebSocketHandler.get_compression_options` to enable on the server
side, and use the ``compression_options`` keyword argument to
`.websocket_connect` on the client side.
* `.WebSocketHandler` no longer logs stack traces when the connection
is closed.
* `.WebSocketHandler.open` now accepts ``*args, **kw`` for consistency
with ``RequestHandler.get`` and related methods.
* The ``Sec-WebSocket-Version`` header now includes all supported versions.
* `.websocket_connect` now has a ``on_message_callback`` keyword argument
for callback-style use without ``read_message()``.
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