mirror of https://github.com/python/cpython
656 lines
20 KiB
ReStructuredText
656 lines
20 KiB
ReStructuredText
.. currentmodule:: asyncio
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.. _asyncio-event-loop:
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Base Event Loop
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===============
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The event loop is the central execution device provided by :mod:`asyncio`.
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It provides multiple facilities, amongst which:
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* Registering, executing and cancelling delayed calls (timeouts).
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* Creating client and server :ref:`transports <asyncio-transport>` for various
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kinds of communication.
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* Launching subprocesses and the associated :ref:`transports
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<asyncio-transport>` for communication with an external program.
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* Delegating costly function calls to a pool of threads.
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.. class:: BaseEventLoop
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Base class of event loops.
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Run an event loop
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-----------------
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.. method:: BaseEventLoop.run_forever()
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Run until :meth:`stop` is called.
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.. method:: BaseEventLoop.run_until_complete(future)
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Run until the :class:`Future` is done.
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If the argument is a :ref:`coroutine object <coroutine>`, it is wrapped by
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:func:`async`.
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Return the Future's result, or raise its exception.
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.. method:: BaseEventLoop.is_running()
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Returns running status of event loop.
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.. method:: BaseEventLoop.stop()
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Stop running the event loop.
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Every callback scheduled before :meth:`stop` is called will run.
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Callbacks scheduled after :meth:`stop` is called will not run.
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However, those callbacks will run if :meth:`run_forever` is called
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again later.
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.. method:: BaseEventLoop.is_closed()
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Returns ``True`` if the event loop was closed.
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.. versionadded:: 3.4.2
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.. method:: BaseEventLoop.close()
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Close the event loop. The loop must not be running.
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This clears the queues and shuts down the executor, but does not wait for
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the executor to finish.
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This is idempotent and irreversible. No other methods should be called after
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this one.
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Calls
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-----
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.. method:: BaseEventLoop.call_soon(callback, \*args)
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Arrange for a callback to be called as soon as possible.
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This operates as a FIFO queue, callbacks are called in the order in
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which they are registered. Each callback will be called exactly once.
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Any positional arguments after the callback will be passed to the
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callback when it is called.
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An instance of :class:`asyncio.Handle` is returned.
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.. method:: BaseEventLoop.call_soon_threadsafe(callback, \*args)
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Like :meth:`call_soon`, but thread safe.
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.. _asyncio-delayed-calls:
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Delayed calls
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-------------
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The event loop has its own internal clock for computing timeouts.
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Which clock is used depends on the (platform-specific) event loop
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implementation; ideally it is a monotonic clock. This will generally be
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a different clock than :func:`time.time`.
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.. note::
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Timeouts (relative *delay* or absolute *when*) should not exceed one day.
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.. method:: BaseEventLoop.call_later(delay, callback, *args)
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Arrange for the *callback* to be called after the given *delay*
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seconds (either an int or float).
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An instance of :class:`asyncio.Handle` is returned.
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*callback* will be called exactly once per call to :meth:`call_later`.
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If two callbacks are scheduled for exactly the same time, it is
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undefined which will be called first.
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The optional positional *args* will be passed to the callback when it
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is called. If you want the callback to be called with some named
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arguments, use a closure or :func:`functools.partial`.
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.. method:: BaseEventLoop.call_at(when, callback, *args)
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Arrange for the *callback* to be called at the given absolute timestamp
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*when* (an int or float), using the same time reference as :meth:`time`.
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This method's behavior is the same as :meth:`call_later`.
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.. method:: BaseEventLoop.time()
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Return the current time, as a :class:`float` value, according to the
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event loop's internal clock.
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.. seealso::
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The :func:`asyncio.sleep` function.
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Coroutines
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----------
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.. method:: BaseEventLoop.create_task(coro)
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Schedule the execution of a :ref:`coroutine object <coroutine>`: wrap it in
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a future. Return a :class:`Task` object.
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Third-party event loops can use their own subclass of :class:`Task` for
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interoperability. In this case, the result type is a subclass of
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:class:`Task`.
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.. seealso::
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The :meth:`async` function.
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.. versionadded:: 3.4.2
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Creating connections
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--------------------
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.. method:: BaseEventLoop.create_connection(protocol_factory, host=None, port=None, \*, ssl=None, family=0, proto=0, flags=0, sock=None, local_addr=None, server_hostname=None)
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Create a streaming transport connection to a given Internet *host* and
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*port*: socket family :py:data:`~socket.AF_INET` or
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:py:data:`~socket.AF_INET6` depending on *host* (or *family* if specified),
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socket type :py:data:`~socket.SOCK_STREAM`. *protocol_factory* must be a
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callable returning a :ref:`protocol <asyncio-protocol>` instance.
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This method is a :ref:`coroutine <coroutine>` which will try to
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establish the connection in the background. When successful, the
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coroutine returns a ``(transport, protocol)`` pair.
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The chronological synopsis of the underlying operation is as follows:
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#. The connection is established, and a :ref:`transport <asyncio-transport>`
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is created to represent it.
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#. *protocol_factory* is called without arguments and must return a
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:ref:`protocol <asyncio-protocol>` instance.
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#. The protocol instance is tied to the transport, and its
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:meth:`connection_made` method is called.
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#. The coroutine returns successfully with the ``(transport, protocol)``
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pair.
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The created transport is an implementation-dependent bidirectional stream.
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.. note::
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*protocol_factory* can be any kind of callable, not necessarily
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a class. For example, if you want to use a pre-created
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protocol instance, you can pass ``lambda: my_protocol``.
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Options allowing to change how the connection is created:
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* *ssl*: if given and not false, a SSL/TLS transport is created
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(by default a plain TCP transport is created). If *ssl* is
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a :class:`ssl.SSLContext` object, this context is used to create
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the transport; if *ssl* is :const:`True`, a context with some
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unspecified default settings is used.
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.. seealso:: :ref:`SSL/TLS security considerations <ssl-security>`
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* *server_hostname*, is only for use together with *ssl*,
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and sets or overrides the hostname that the target server's certificate
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will be matched against. By default the value of the *host* argument
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is used. If *host* is empty, there is no default and you must pass a
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value for *server_hostname*. If *server_hostname* is an empty
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string, hostname matching is disabled (which is a serious security
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risk, allowing for man-in-the-middle-attacks).
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* *family*, *proto*, *flags* are the optional address family, protocol
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and flags to be passed through to getaddrinfo() for *host* resolution.
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If given, these should all be integers from the corresponding
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:mod:`socket` module constants.
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* *sock*, if given, should be an existing, already connected
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:class:`socket.socket` object to be used by the transport.
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If *sock* is given, none of *host*, *port*, *family*, *proto*, *flags*
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and *local_addr* should be specified.
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* *local_addr*, if given, is a ``(local_host, local_port)`` tuple used
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to bind the socket to locally. The *local_host* and *local_port*
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are looked up using getaddrinfo(), similarly to *host* and *port*.
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.. seealso::
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The :func:`open_connection` function can be used to get a pair of
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(:class:`StreamReader`, :class:`StreamWriter`) instead of a protocol.
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.. method:: BaseEventLoop.create_datagram_endpoint(protocol_factory, local_addr=None, remote_addr=None, \*, family=0, proto=0, flags=0)
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Create datagram connection: socket family :py:data:`~socket.AF_INET` or
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:py:data:`~socket.AF_INET6` depending on *host* (or *family* if specified),
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socket type :py:data:`~socket.SOCK_DGRAM`.
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This method is a :ref:`coroutine <coroutine>` which will try to
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establish the connection in the background. When successful, the
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coroutine returns a ``(transport, protocol)`` pair.
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See the :meth:`BaseEventLoop.create_connection` method for parameters.
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.. method:: BaseEventLoop.create_unix_connection(protocol_factory, path, \*, ssl=None, sock=None, server_hostname=None)
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Create UNIX connection: socket family :py:data:`~socket.AF_UNIX`, socket
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type :py:data:`~socket.SOCK_STREAM`. The :py:data:`~socket.AF_UNIX` socket
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family is used to communicate between processes on the same machine
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efficiently.
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This method is a :ref:`coroutine <coroutine>` which will try to
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establish the connection in the background. When successful, the
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coroutine returns a ``(transport, protocol)`` pair.
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See the :meth:`BaseEventLoop.create_connection` method for parameters.
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Availability: UNIX.
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Creating listening connections
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------------------------------
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.. method:: BaseEventLoop.create_server(protocol_factory, host=None, port=None, \*, family=socket.AF_UNSPEC, flags=socket.AI_PASSIVE, sock=None, backlog=100, ssl=None, reuse_address=None)
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Create a TCP server bound to host and port. Return a :class:`Server` object,
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its :attr:`~Server.sockets` attribute contains created sockets. Use the
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:meth:`Server.close` method to stop the server: close listening sockets.
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This method is a :ref:`coroutine <coroutine>`.
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If *host* is an empty string or None all interfaces are assumed
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and a list of multiple sockets will be returned (most likely
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one for IPv4 and another one for IPv6).
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*family* can be set to either :data:`~socket.AF_INET` or
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:data:`~socket.AF_INET6` to force the socket to use IPv4 or IPv6. If not set
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it will be determined from host (defaults to :data:`~socket.AF_UNSPEC`).
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*flags* is a bitmask for :meth:`getaddrinfo`.
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*sock* can optionally be specified in order to use a preexisting
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socket object.
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*backlog* is the maximum number of queued connections passed to
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:meth:`~socket.socket.listen` (defaults to 100).
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ssl can be set to an :class:`~ssl.SSLContext` to enable SSL over the
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accepted connections.
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*reuse_address* tells the kernel to reuse a local socket in
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TIME_WAIT state, without waiting for its natural timeout to
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expire. If not specified will automatically be set to True on
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UNIX.
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.. seealso::
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The function :func:`start_server` creates a (:class:`StreamReader`,
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:class:`StreamWriter`) pair and calls back a function with this pair.
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.. method:: BaseEventLoop.create_unix_server(protocol_factory, path=None, \*, sock=None, backlog=100, ssl=None)
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Similar to :meth:`BaseEventLoop.create_server`, but specific to the
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socket family :py:data:`~socket.AF_UNIX`.
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Availability: UNIX.
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Watch file descriptors
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----------------------
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.. method:: BaseEventLoop.add_reader(fd, callback, \*args)
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Start watching the file descriptor for read availability and then call the
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*callback* with specified arguments.
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.. method:: BaseEventLoop.remove_reader(fd)
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Stop watching the file descriptor for read availability.
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.. method:: BaseEventLoop.add_writer(fd, callback, \*args)
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Start watching the file descriptor for write availability and then call the
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*callback* with specified arguments.
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.. method:: BaseEventLoop.remove_writer(fd)
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Stop watching the file descriptor for write availability.
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Low-level socket operations
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---------------------------
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.. method:: BaseEventLoop.sock_recv(sock, nbytes)
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Receive data from the socket. The return value is a bytes object
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representing the data received. The maximum amount of data to be received
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at once is specified by *nbytes*.
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This method is a :ref:`coroutine <coroutine>`.
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.. seealso::
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The :meth:`socket.socket.recv` method.
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.. method:: BaseEventLoop.sock_sendall(sock, data)
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Send data to the socket. The socket must be connected to a remote socket.
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This method continues to send data from *data* until either all data has
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been sent or an error occurs. ``None`` is returned on success. On error,
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an exception is raised, and there is no way to determine how much data, if
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any, was successfully processed by the receiving end of the connection.
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This method is a :ref:`coroutine <coroutine>`.
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.. seealso::
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The :meth:`socket.socket.sendall` method.
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.. method:: BaseEventLoop.sock_connect(sock, address)
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Connect to a remote socket at *address*.
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The *address* must be already resolved to avoid the trap of hanging the
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entire event loop when the address requires doing a DNS lookup. For
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example, it must be an IP address, not an hostname, for
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:py:data:`~socket.AF_INET` and :py:data:`~socket.AF_INET6` address families.
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Use :meth:`getaddrinfo` to resolve the hostname asynchronously.
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This method is a :ref:`coroutine <coroutine>`.
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.. seealso::
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The :meth:`BaseEventLoop.create_connection` method, the
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:func:`open_connection` function and the :meth:`socket.socket.connect`
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method.
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.. method:: BaseEventLoop.sock_accept(sock)
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Accept a connection. The socket must be bound to an address and listening
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for connections. The return value is a pair ``(conn, address)`` where *conn*
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is a *new* socket object usable to send and receive data on the connection,
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and *address* is the address bound to the socket on the other end of the
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connection.
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This method is a :ref:`coroutine <coroutine>`.
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.. seealso::
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The :meth:`BaseEventLoop.create_server` method, the :func:`start_server`
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function and the :meth:`socket.socket.accept` method.
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Resolve host name
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-----------------
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.. method:: BaseEventLoop.getaddrinfo(host, port, \*, family=0, type=0, proto=0, flags=0)
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This method is a :ref:`coroutine <coroutine>`, similar to
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:meth:`socket.getaddrinfo` function but non-blocking.
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.. method:: BaseEventLoop.getnameinfo(sockaddr, flags=0)
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This method is a :ref:`coroutine <coroutine>`, similar to
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:meth:`socket.getnameinfo` function but non-blocking.
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Connect pipes
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-------------
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.. method:: BaseEventLoop.connect_read_pipe(protocol_factory, pipe)
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Register read pipe in eventloop. Set the *pipe* to non-blocking mode.
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*protocol_factory* should instantiate object with :class:`Protocol`
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interface. *pipe* is a :term:`file-like object <file object>`.
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Return pair ``(transport, protocol)``, where *transport* supports the
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:class:`ReadTransport` interface.
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This method is a :ref:`coroutine <coroutine>`.
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.. method:: BaseEventLoop.connect_write_pipe(protocol_factory, pipe)
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Register write pipe in eventloop.
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*protocol_factory* should instantiate object with :class:`BaseProtocol`
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interface. Pipe is file-like object already switched to nonblocking.
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Return pair (transport, protocol), where transport support
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:class:`WriteTransport` interface.
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This method is a :ref:`coroutine <coroutine>`.
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.. seealso::
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The :meth:`BaseEventLoop.subprocess_exec` and
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:meth:`BaseEventLoop.subprocess_shell` methods.
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UNIX signals
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------------
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Availability: UNIX only.
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.. method:: BaseEventLoop.add_signal_handler(signum, callback, \*args)
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Add a handler for a signal.
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Raise :exc:`ValueError` if the signal number is invalid or uncatchable.
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Raise :exc:`RuntimeError` if there is a problem setting up the handler.
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.. method:: BaseEventLoop.remove_signal_handler(sig)
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Remove a handler for a signal.
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Return ``True`` if a signal handler was removed, ``False`` if not.
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.. seealso::
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The :mod:`signal` module.
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Executor
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--------
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Call a function in an :class:`~concurrent.futures.Executor` (pool of threads or
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pool of processes). By default, an event loop uses a thread pool executor
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(:class:`~concurrent.futures.ThreadPoolExecutor`).
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.. method:: BaseEventLoop.run_in_executor(executor, callback, \*args)
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Arrange for a callback to be called in the specified executor.
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The *executor* argument should be an :class:`~concurrent.futures.Executor`
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instance. The default executor is used if *executor* is ``None``.
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This method is a :ref:`coroutine <coroutine>`.
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.. method:: BaseEventLoop.set_default_executor(executor)
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Set the default executor used by :meth:`run_in_executor`.
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Error Handling API
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------------------
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Allows to customize how exceptions are handled in the event loop.
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.. method:: BaseEventLoop.set_exception_handler(handler)
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Set *handler* as the new event loop exception handler.
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If *handler* is ``None``, the default exception handler will
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be set.
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If *handler* is a callable object, it should have a
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matching signature to ``(loop, context)``, where ``loop``
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will be a reference to the active event loop, ``context``
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will be a ``dict`` object (see :meth:`call_exception_handler`
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documentation for details about context).
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.. method:: BaseEventLoop.default_exception_handler(context)
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Default exception handler.
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This is called when an exception occurs and no exception
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handler is set, and can be called by a custom exception
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handler that wants to defer to the default behavior.
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*context* parameter has the same meaning as in
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:meth:`call_exception_handler`.
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.. method:: BaseEventLoop.call_exception_handler(context)
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Call the current event loop exception handler.
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*context* is a ``dict`` object containing the following keys
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(new keys may be introduced later):
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* 'message': Error message;
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* 'exception' (optional): Exception object;
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* 'future' (optional): :class:`asyncio.Future` instance;
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* 'handle' (optional): :class:`asyncio.Handle` instance;
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* 'protocol' (optional): :ref:`Protocol <asyncio-protocol>` instance;
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* 'transport' (optional): :ref:`Transport <asyncio-transport>` instance;
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* 'socket' (optional): :class:`socket.socket` instance.
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.. note::
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Note: this method should not be overloaded in subclassed
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event loops. For any custom exception handling, use
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:meth:`set_exception_handler()` method.
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Debug mode
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----------
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.. method:: BaseEventLoop.get_debug()
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Get the debug mode (:class:`bool`) of the event loop.
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The default value is ``True`` if the environment variable
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:envvar:`PYTHONASYNCIODEBUG` is set to a non-empty string, ``False``
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otherwise.
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.. versionadded:: 3.4.2
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.. method:: BaseEventLoop.set_debug(enabled: bool)
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Set the debug mode of the event loop.
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.. versionadded:: 3.4.2
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.. seealso::
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The :ref:`debug mode of asyncio <asyncio-debug-mode>`.
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Server
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------
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.. class:: Server
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Server listening on sockets.
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Object created by the :meth:`BaseEventLoop.create_server` method and the
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:func:`start_server` function. Don't instanciate the class directly.
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.. method:: close()
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Stop serving: close listening sockets and set the :attr:`sockets`
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attribute to ``None``.
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The sockets that represent existing incoming client connections are
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leaved open.
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The server is closed asynchonously, use the :meth:`wait_closed` coroutine
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to wait until the server is closed.
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.. method:: wait_closed()
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Wait until the :meth:`close` method completes.
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This method is a :ref:`coroutine <coroutine>`.
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.. attribute:: sockets
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List of :class:`socket.socket` objects the server is listening to, or
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``None`` if the server is closed.
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Handle
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------
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.. class:: Handle
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A callback wrapper object returned by :func:`BaseEventLoop.call_soon`,
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:func:`BaseEventLoop.call_soon_threadsafe`, :func:`BaseEventLoop.call_later`,
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and :func:`BaseEventLoop.call_at`.
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.. method:: cancel()
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Cancel the call.
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.. _asyncio-hello-world-callback:
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Example: Hello World (callback)
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-------------------------------
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Print ``Hello World`` every two seconds, using a callback::
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import asyncio
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def print_and_repeat(loop):
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print('Hello World')
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loop.call_later(2, print_and_repeat, loop)
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loop = asyncio.get_event_loop()
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loop.call_soon(print_and_repeat, loop)
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try:
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loop.run_forever()
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finally:
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loop.close()
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.. seealso::
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:ref:`Hello World example using a coroutine <asyncio-hello-world-coroutine>`.
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Example: Set signal handlers for SIGINT and SIGTERM
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---------------------------------------------------
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Register handlers for signals :py:data:`SIGINT` and :py:data:`SIGTERM`::
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import asyncio
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import functools
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import os
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import signal
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def ask_exit(signame):
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print("got signal %s: exit" % signame)
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loop.stop()
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loop = asyncio.get_event_loop()
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for signame in ('SIGINT', 'SIGTERM'):
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loop.add_signal_handler(getattr(signal, signame),
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functools.partial(ask_exit, signame))
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print("Event loop running forever, press CTRL+c to interrupt.")
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print("pid %s: send SIGINT or SIGTERM to exit." % os.getpid())
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try:
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loop.run_forever()
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finally:
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loop.close()
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