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Changelog

.. currentmodule:: gevent

Release 1.0b2

Major and backward-incompatible changes:

  • Made the threadpool-based resolver the default. To enable the ares-based resolver, set GEVENT_RESOLVER=ares env var.
  • Added support for child watchers (not available on Windows). - Libev loop now reaps all children by default. - If NOCHILD flag is passed to the loop, child watchers and child reaping are disabled.
  • Renamed gevent.coros to gevent.lock. The gevent.coros is still available but deprecated.
  • Added 'stat' watchers to loop.
  • The setup.py now recognizes gevent_embed env var. When set to "no", bundled c-ares and libev are ignored.
  • Added optional 'ref' argument to sleep(). When ref=false, the watchers created by sleep() do not hold gevent.run() from exiting.
  • ThreadPool now calls Hub.handle_error for exceptions in worker threads.
  • ThreadPool got new method: apply_e.
  • Added new extension module gevent._util and moved gevent.core.set_exc_info function there.
  • Added new extension module gevent._semaphore. It contains Semaphore class which is imported by gevent.lock as gevent.lock.Semaphore. Providing Semaphore in extension module ensures that trace function set with settrace will not be called during __exit__. Thanks to Ralf Schmitt.
  • It is now possible to kill or pre-spawn threads in ThreadPool by setting its 'size' property.

core:

  • Make sure the default loop cannot be destroyed more than once, thus crashing the process.
  • Make Hub.destroy() method not to destroy the default loop, unless destroy_loop is True. Non-default loops are still destroyed by default.
  • loop: Removed properties from loop: fdchangecnt, timercnt, asynccnt.
  • loop: Added properties: sigfd, origflags, origflags_int
  • loop: The EVFLAG_NOENV is now always passed to libev. Thus LIBEV_FLAGS env variable is no longer checked. Use GEVENT_BACKEND.

Misc:

  • Check that the argument of link() is callable. Raise TypeError when it's not.
  • Fixed TypeError in baseserver when parsing an address.
  • Pool: made add() and discard() usable by external users. Thanks to Danil Eremeev.
  • When specifying a class to import, it is not possible to use format path/package.module.name
  • pywsgi: Made sure format_request() does not fail if 'status' attribute is not set yet
  • pywsgi: Added REMOTE_PORT variable to the environment.

Examples:

  • portforwarder.py now shows how to use gevent.run() to implement graceful shutdown of a server.
  • psycopg2_pool.py: Changed execute() to return rowcount.
  • psycopg2_pool.py: Added fetchall() and fetchiter() methods.

Developer utilities:

  • When building, CYTHON env variable can be used to specify Cython executable to use.
  • util/make_dist.py now recongizes --fast and --revert options. Previous --rsync option is removed.
  • Added util/winvbox.py which automates building/testing/making binaries on Windows VM.
  • Fixed typos in exception handling code in testrunner.py
  • Fixed patching unittest.runner on Python2.7. This caused the details of test cases run lost.
  • Made testrunner.py kill the whole process group after test is done.

Release 1.0b1

Backward-incompatible changes:

  • Removed "link to greenlet" feature of Greenlet.
  • If greenlet module older than 0.3.2 is used, then greenlet.GreenletExit.__bases__ is monkey patched to derive from BaseException and not Exception. That way gevent.GreenletExit is always derived from BaseException, regardless of installed greenlet version.
  • Some code supporting Python 2.4 has been removed.

Release highlights:

  • Added thread pool: gevent.threadpool.ThreadPool.
  • Added thread pool-based resolver. Enable with GEVENT_RESOLVER=thread.
  • Added UDP server: gevent.server.DatagramServer
  • A "configure" is now run on libev. This fixes a problem of 'kqueue' not being available on Mac OS X.
  • Gevent recognizes some environment variables now: - GEVENT_BACKEND allows passing argument to loop, e.g. "GEVENT_BACKEND=select" for force select backend - GEVENT_RESOLVER allows choosing resolver class. - GEVENT_THREADPOOL allows choosing thread pool class.
  • Added new examples: portforwarder, psycopg2_pool.py, threadpool.py, udp_server.py
  • Fixed non-embedding build. To build against system libev, remove or rename 'libev' directory. To build against system c-ares, remove or rename 'c-ares'. Thanks to Örjan Persson.

misc: - gevent.joinall() method now accepts optional 'count' keyword. - gevent.fork() only calls reinit() in the child process now. - gevent.run() now returns False when exiting because of timeout or event (previous None). - Hub got a new method: destroy(). - Hub got a new property: threadpool.

ares.pyx: - Fixed issue #104: made ares_host_result pickable. Thanks to Shaun Cutts.

pywsgi: - Removed unused deprecated 'wfile' property from WSGIHandler - Fixed issue #92: raise IOError on truncated POST requests. - Fixed issue #93: do not sent multiple "100 continue" responses

core: - Fixed issue #97: the timer watcher now calls ev_now_update() in start() and again() unless 'update' keyword is passed and set to False. - add set_syserr_cb() function; it's used by gevent internally. - gevent now installs syserr callback using libev's set_syserr_cb. This callback is called when libev encounters an error it cannot recover from. The default action is to print a message and abort. With the callback installed, a SystemError() is now raised in the main greenlet. - renamed 'backend_fd' property to 'fileno()' method. (not available if you build gevent against system libev) - added 'asynccnt' property (not available if you build gevent against system libev) - made loop.__repr__ output a bit more compact - the watchers check the arguments for validness now (previously invalid argument would crash libev). - The 'async' watcher now has send() method; - fixed time() function - libev has been upgraded to latest CVS version. - libev has been patched to use send()/recv() for evpipe on windows when libev_vfd.h is in effect

resolver_ares: - Slightly improved compatibility with stdlib's socket in some error cases.

socket: - Fixed close() method not to reference any globals - Fixed issue #115: _dummy gets unexpected Timeout arg - Removed _fileobject used for python 2.4 compatibility in socket.py - Fixed issue #94: fallback to buffer if memoryview fails in _get_memory on python 2.7

monkey: - Removed patch_httplib() - Fixed issue #112: threading._sleep is not patched. Thanks to David LaBissoniere. - Added get_unpatched() function. However, it is slightly broken at the moment.

backdoor: - make 'locals()' not spew out __builtin__.__dict__ in backdoor - add optional banner argument to BackdoorServer

servers: - add server.DatagramServer; - StreamServer: 'ssl_enabled' is now a read-only property - servers no longer have 'kill' method; it has been renamed to 'close'. - listeners can now be configured as strings, e.g. ':80' or 80 - modify baseserver.BaseServer in such a way that makes it a good base class for both StreamServer and DatagramServer - BaseServer no longer accepts 'backlog' parameter. It is now done by StreamServer. - BaseServer implements start_accepting() and stop_accepting() methods - BaseServer now implements "temporarily stop accepting" strategy - BaseServer now has _do_read method which does everything except for actually calling accept()/recvfrom() - pre_start() method is renamed to init_socket() - renamed _stopped_event to _stop_event - 'started' is now a read-only property (which actually reports state of _stop_event) - post_stop() method is removed - close() now sets _stop_event(), thus setting 'started' to False, thus causing serve_forever() to exit - _tcp_listener() function is moved from baseserver.py to server.py - added 'fatal_errors' class attribute which is a tuple of all errnos that should kill the server

coros: - Semaphore: add _start_notify() method - Semaphore: avoid copying list of links; rawlink() no longer schedules notification

Release 1.0a3

Added 'ref' property to all watchers. Settings it to False make watcher call ev_unref/ev_ref appropriately so that this watcher does not prevent loop.run()/hub.join()/run() from exiting. Made resolver_ares.Resolver use 'ref' property for internal watcher.

In all servers, method "kill" was renamed to "close". The old name is available as deprecated alias.

Added a few properties to the loop: backend_fd, fdchangecnt, timercnt.

Upgraded c-ares to 1.7.5+patch.

Fixed getaddrinfo to return results in the order (::1, IPv4, IPv6).

Fixed getaddrinfo() to handle integer of string type. Thanks to kconor.

Fixed gethostbyname() to handle '' (empty string).

Fixed getaddrinfo() to convert UnicodeEncodeError into error('Int or String expected').

Fixed getaddrinfo() to uses the lowest 16 bits of passed port integer similar to built-in _socket.

Fixed getnameinfo() to call getaddrinfo() to process arguments similar to built-in _socket.

Fixed gethostbyaddr() to use getaddrinfo() to process arguments.

version_info is now a 5-tuple.

Added handle_system_error() method to Hub (used internally).

Fixed Hub's run() method to never exit. This prevent inappropriate switches into parent greenlet.

Fixed Hub.join() to return True if Hub was already dead.

Added 'event' argument to Hub.join().

Added run() function to gevent top level package.

Fixed Greenlet.start() to exit silently if greenlet was already started rather than raising :exc:`AssertionError`.

Fixed Greenlet.start() not to schedule another switch if greenlet is already dead.

Fixed gevent.signal() to spawn Greenlet instead of raw greenlet. Also it'll switch into the new greenlet immediately instead of scheduling additional callback.

Do monkey patch create_connection() as gevent's version works better with gevent.socket.socket than the standard create_connection.

pywsgi: make sure we don't try to read more requests if socket operation failed with EPIPE

pywsgi: if we failed to send the reply, change 'status' to socket error so that the logs mention the error.

Release 1.0a2

Fixed a bug in gevent.queue.Channel class. (Thanks to Alexey Borzenkov)

Release 1.0a1

TODO: - gevent.http? - gevent.httplib? - gevent.wsgi? (Currently gevent/wsgi.py imports classes from gevent/pywsgi.py)

Backward-incompatible changes:

Release highlights:

  • The :mod:`gevent.core` module now wraps libev's API and is not compatible with gevent 0.x.
  • Added a concept of pluggable event loops. By default gevent.core.loop is used, which is a wrapper around libev.
  • Added a concept of pluggable name resolvers. By default a resolver based on c-ares library is used.
  • Added support for multiple OS threads, each new thread will get its own Hub instance with its own event loop.
  • The release now includes and embeds the dependencies: libev and c-ares.
  • The standard :mod:`signal` works now as expected.
  • The unhandled errors are now handled uniformely by Hub.handle_error function.
  • Added :class:`Channel` class to :mod:`gevent.queue` module. It is equivalent to Queue(0) in gevent 0.x, which is deprecated now.
  • Added method :meth:`peek` to :class:`Queue` class.
  • Added :func:`idle` function which blocks until the event loop is idle.
  • Added a way to gracefully shutdown the application by waiting for all outstanding greenlets/servers/watchers: :meth:`Hub.join`.
  • Added new :mod:`gevent.ares` C extension which wraps c-ares and provides asynchronous DNS resolver.
  • Added new :mod:`gevent.resolver_ares` module provides synchronous API on top of :mod:`gevent.ares`.

The :mod:`gevent.socket` module:

  • DNS functions now use c-ares library rather than libevent-dns. This fixes a number of problems with name resolving: - Issue #2: DNS resolver no longer breaks after fork(). You still need to call :func:`gevent.fork` (os.fork is monkey

    patched with it if monkey.patch_all() was called).

    • DNS resolver no longer ignores /etc/resolv.conf and /etc/hosts.

  • The following functions were added to socket module - gethostbyname_ex - getnameinfo - gethostbyaddr - getfqdn

  • Removed undocumented bind_and_listen and tcp_listener

The :class:`Hub` object:

  • Added :meth:`join` method which waits until the event loop exits or optional timeout expires.
  • Added :meth:`wait` method which waits until a watcher has got an event.
  • Added :meth:`handle_error` method which is called by all of gevent in case of unhandled exception.
  • Added :meth:`print_exception` method which is called by handle_error to print the exception traceback.

The :class:`Greenlet` objects:

  • Added __nonzero__ implementation that returns True after greenlet was started until it's dead. Previously greenlet was False after start() until it was first switched to.

The mod:gevent.pool module:

  • It is now possible to add raw greenlets to the pool.
  • The :meth:`map` and :meth:`imap` methods now start yielding the results as soon as possible.
  • The :meth:`imap_unordered` no longer swallows an exception raised while iterating its argument.

Miscellaneous:

  • gevent.sleep(<negative value>) no longer raises an exception, instead it does sleep(0).
  • Added method clear to internal Waiter class.
  • Removed wait method from internal Waiter class.
  • The :class:`WSGIServer` now sets max_accept to 1 if wsgi.multiprocessing is set to True.
  • Added :func:`monkey.patch_module` function that monkey patches module using __implements__ list provided by gevent module. All of gevent modules that replace stdlib module now have __implements__ attribute.

Release 0.13.6 (May 2, 2011)

  • Added __copy__ method to :class:`gevent.local.local` class that implements copy semantics compatible with built-in threading.local. Patch by Galfy Pundee.
  • Fixed :class:`StreamServer` class to catch EWOULDBLOCK rather than EAGAIN. This fixes lots of spurious tracebacks on Windows where these two constants are not the same. Patch by Alexey Borzenkov.
  • Fixed issue #65: :func:`fork` now calls event_reinit only in the child process; otherwise the process could hang when using libevent2. Patch by Alexander Boudkar.

Release 0.13.5 (Apr 21, 2011)

  • Fixed build problem on Python 2.5

Release 0.13.4 (Apr 11, 2011)

Release 0.13.3 (Feb 7, 2011)

Release 0.13.2 (Jan 28, 2011)

Release 0.13.1 (Sep 23, 2010)

Release highlights:

:mod:`gevent.socket` module:

:mod:`gevent.ssl` module:

  • Imported a number of patches from stdlib by Antoine Pitrou:
    • Calling :meth:`makefile` method on an SSL object would prevent the underlying socket from being closed until all objects get truely destroyed (Python issue #5238).
    • SSL handshake would ignore the socket timeout and block indefinitely if the other end didn't respond (Python issue #5103).
    • When calling :meth:`getpeername` in SSLSocket.__init__, only silence exceptions caused by the "socket not connected" condition.
  • Added support for ciphers argument.
  • Updated SSLSocket.send and SSLSocket.recv methods to match the behavior of stdlib :mod:`ssl` better.
  • Fixed :class:`ssl.SSLObject` to delete events used by other greenlets when closing the instance (issue #34).

Miscellaneous:

  • Made :class:`BaseServer` accept long values as pool argument in addition to int.
  • Made :attr:`http._requests` attribute public.
  • Updated webchat example to use file on disk rather than in-memory sqlite database to avoid :exc:`OperationalError`.
  • Fixed webproxy.py example to be runnable under external WSGI server.
  • Fixed bogus failure in test__exc_info.py.
  • Added new test to check PEP8 conformance: xtest_pep8.py.
  • Fixed :class:`BackdoorServer` close the connection on :exc:`SystemExit` and simplified the code.
  • Made :class:`Pool` raise :exc:`ValueError` when initialized with size=0.
  • Updated setup.py --libevent to configure and make libevent if it's not built already.
  • Updated setup.py to use setuptools if present and add dependency on greenlet.
  • Fixed doc/mysphinxext.py to work with Sphinx 1. Thanks by Örjan Persson.

Release 0.13.0 (Jul 14, 2010)

Release highlights:

Backward-incompatible changes:

:mod:`gevent.socket` module:

  • Fixed issues #26 and #34: closing the socket while reading/writing/connecting is now safe. Thanks to Cyril Bay.
  • Imported :func:`getfqdn` from :mod:`socket` module.
  • The module now uses sys.platform to detect Windows rather than :mod:`platform` module.
  • Fixed issue #27: :func:`getaddrinfo` used to handle the case when socktype or proto were equal to 0. Thanks to Randall Leeds.

:mod:`gevent.coros` module:

:mod:`gevent.event` module:

:mod:`gevent.wsgi` module:

:mod:`gevent.pywsgi` module:

:mod:`gevent.core` module:

:mod:`gevent.http` and :mod:`gevent.wsgi` modules:

Miscellaneous:

Examples:

Thanks to Ralf Schmitt for :mod:`pywsgi`, a number of fixes for :mod:`wsgi`, help with :mod:`baseserver` and :mod:`server` modules, improving setup.py and various other patches and suggestions.

Thanks to Uriel Katz for :mod:`pywsgi` patches.

Release 0.12.2 (Mar 2, 2010)

  • Fixed http server to put the listening socket into a non-blocking mode. Contributed by Ralf Schmitt.

Release 0.12.1 (Feb 26, 2010)

  • Removed a symlink from the distribution (that causes pip to fail). Thanks to Brad Clements for reporting it.
  • setup.py: automatically create symlink from build/lib.../gevent/core.so to gevent/core.so.
  • :mod:`gevent.socket`: Improved compatibility with stdlib's socket:

Release 0.12.0 (Feb 5, 2010)

Release highlights:

:mod:`gevent.wsgi` module:

  • Made env["REMOTE_PORT"] into a string.
  • Fixed the server to close the iterator returned by the application.
  • Made wsgi.input object iterable.

:mod:`gevent.core` module:

  • Made DNS functions no longer accept/return IP addresses in dots-and-numbers format. They work with packed IPs now.
  • Made DNS functions no longer accept additional arguments to pass to the callback.
  • Fixed DNS functions to check the return value of the libevent functions and raise :exc:`IOError` if they failed.
  • Added :func:`core.dns_err_to_string`.
  • Made core.event.cancel not to raise if event_del reports an error. instead, the return code is passed to the caller.
  • Fixed minor issue in string representation of the events.

:mod:`gevent.socket` module:

Miscellaneous:

Release 0.11.2 (Dec 10, 2009)

Release 0.11.1 (Nov 15, 2009)

  • Fixed bug in :func:`select.select` function. Passing non-empty list of write descriptors used to cause this function to fail.
  • Changed setup.py to go ahead with the compilation even if the actual version of libevent cannot be determined (version 1.x.x is assumed in that case).

Contributed by Ludvig Ericson:

  • Fixed :mod:`wsgi`'s start_response to recognize exc_info argument.
  • Fixed setup.py to look for libevent.dylib rather than .so on Darwin platforms.

Release 0.11.0 (Oct 9, 2009)

Release 0.10.0 (Aug 26, 2009)

The following items were added to the gevent top level package:

The following items were marked as deprecated:

Internally, gevent.greenlet was split into a number of modules:

Thanks to Jason Toffaletti for reporting the installation issue and providing a test case for WSGI double content-length header bug.

Release 0.9.3 (Aug 3, 2009)

  • Fixed all known bugs in the :mod:`gevent.queue` module and made it 2.4-compatible. :class:`LifoQueue` and :class:`PriorityQueue` are implemented as well. :mod:`gevent.queue` will deprecate both coros.Queue and coros.Channel.
  • Fixed :class:`Timeout` to raise itself by default. TimeoutError is gone. Silent timeout is now created by passing False instead of None.
  • Fixed bug in :func:`gevent.select.select` where it could silent the wrong timeout.
  • :func:`spawn` and :func:`spawn_later` now avoid creating a closure and this decreases spawning time by 50%.
  • kill's and killall's wait argument was renamed to block. The polling is now implemented by greenlet.join and greenlet.joinall functions and it become more responsive, with gradual increase of sleep time.
  • Renamed proc.RunningProcSet to proc.ProcSet.
  • Added :func:`shutdown` function, which blocks until libevent has finished dispatching the events.
  • The return value of event_add and event_del in core.pyx are now checked properly and :exc:`IOError` is raised if they have failed.
  • Fixed backdoor.py, accidentally broken in the previous release.

Release 0.9.2 (Jul 20, 2009)

Release 0.9.1 (Jul 9, 2009)

  • Fixed compilation with libevent-1.3. Thanks to Litao Wei for reporting the problem.
  • Fixed :class:`Hub` to recover silently after event_dispatch() failures (I've seen this happen after fork even though event_reinit() is called as necessary). The end result is that :func:`fork` now works more reliably, as detected by test_socketserver.py - it used to fail occasionally, now it does not.
  • Reorganized the package, most of the stuff from gevent/__init__.py was moved to gevent/greenlet.py. gevent/__init__.py imports some of it back but not everything.
  • Renamed gevent.timeout to :class:`gevent.Timeout`. The old name is available as an alias.
  • Fixed a few bugs in :class:`queue.Queue`. Added test_queue.py from standard tests to check how good is :class:`queue.Queue` a replacement for a standard :mod:`Queue` (not good at all, timeouts in :meth:`queue.Queue.put` don't work yet)
  • :mod:`monkey` now patches ssl module when on 2.6 (very limited support).
  • Improved compatibility with Python 2.6 and Python 2.4.
  • Greenlet installed from PyPI (without py.magic prefix) is properly recognized now.
  • core.pyx was accidentally left out of the source package, it's included now.
  • :class:`GreenSocket <socket.socket>` now wraps a socket object from _socket module rather than from :mod:`socket`.

Release 0.9.0 (Jul 8, 2009)

Started as eventlet 0.8.11 fork, with the intention to support only libevent as a backend. Compared to eventlet, this version has a much simpler API and implementation and a few severe bugs fixed, namely

There's a test in my repo of eventlet that reproduces both of them: http://bitbucket.org/denis/eventlet/src/tip/greentest/test__socket.py

Besides having less bugs and less code to care about the goals of the fork are:

  • Piggy-back on libevent as much as possible (use its http and dns code).
  • Use the interfaces and conventions from the standard Python library where possible.