File: //lib64/python3.6/site-packages/zmq/eventloop/minitornado/__pycache__/ioloop.cpython-36.pyc
3
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d� de �Z*G dd� de*�Z+G dd� de,�Z-G dd� de,�Z.dS )a� An I/O event loop for non-blocking sockets.
Typical applications will use a single `IOLoop` object, in the
`IOLoop.instance` singleton. The `IOLoop.start` method should usually
be called at the end of the ``main()`` function. Atypical applications may
use more than one `IOLoop`, such as one `IOLoop` per thread, or per `unittest`
case.
In addition to I/O events, the `IOLoop` can also schedule time-based events.
`IOLoop.add_timeout` is a non-blocking alternative to `time.sleep`.
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__module__� __qualname__� r r � /usr/lib64/python3.6/ioloop.pyr C s r c @ s� e Zd ZdZdZdZdZdZdZdZ dRZ
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d� �Zdd� Zedd� �ZedTdd��Zdd� Zedd� �Z e dd� �Z e d d � �Z dUd d �Z dVd"d#�Z!d$d%� Z"d&d'� Z#d(d)� Z$d*d+� Z%d,d-� Z&d.d/� Z'd0d1� Z(d2d3� Z)d4d5� Z*dWd6d7�Z+d8d9� Z,d:d;� Z-d<d=� Z.d>d?� Z/d@dA� Z0dBdC� Z1dDdE� Z2dFdG� Z3dHdI� Z4dJdK� Z5dLdM� Z6dNdO� Z7dPdQ� Z8d S )X�IOLoopa� A level-triggered I/O loop.
We use ``epoll`` (Linux) or ``kqueue`` (BSD and Mac OS X) if they
are available, or else we fall back on select(). If you are
implementing a system that needs to handle thousands of
simultaneous connections, you should use a system that supports
either ``epoll`` or ``kqueue``.
Example usage for a simple TCP server:
.. testcode::
import errno
import functools
import tornado.ioloop
import socket
def connection_ready(sock, fd, events):
while True:
try:
connection, address = sock.accept()
except socket.error as e:
if e.args[0] not in (errno.EWOULDBLOCK, errno.EAGAIN):
raise
return
connection.setblocking(0)
handle_connection(connection, address)
if __name__ == '__main__':
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM, 0)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sock.setblocking(0)
sock.bind(("", port))
sock.listen(128)
io_loop = tornado.ioloop.IOLoop.current()
callback = functools.partial(connection_ready, sock)
io_loop.add_handler(sock.fileno(), callback, io_loop.READ)
io_loop.start()
.. testoutput::
:hide:
By default, a newly-constructed `IOLoop` becomes the thread's current
`IOLoop`, unless there already is a current `IOLoop`. This behavior
can be controlled with the ``make_current`` argument to the `IOLoop`
constructor: if ``make_current=True``, the new `IOLoop` will always
try to become current and it raises an error if there is already a
current instance. If ``make_current=False``, the new `IOLoop` will
not try to become current.
.. versionchanged:: 4.2
Added the ``make_current`` keyword argument to the `IOLoop`
constructor.
r � � � � i � � r c
C s4 t td�s.tj� t td�s$t� t_W dQ R X tjS )a1 Returns a global `IOLoop` instance.
Most applications have a single, global `IOLoop` running on the
main thread. Use this method to get this instance from
another thread. In most other cases, it is better to use `current()`
to get the current thread's `IOLoop`.
� _instanceN)�hasattrr �_instance_lockr r r r r �instance� s
zIOLoop.instancec C s
t td�S )z8Returns true if the singleton instance has been created.r )r r r r r r � initialized� s zIOLoop.initializedc C s t j� st�| t _dS )z�Installs this `IOLoop` object as the singleton instance.
This is normally not necessary as `instance()` will create
an `IOLoop` on demand, but you may want to call `install` to use
a custom subclass of `IOLoop`.
N)r r" �AssertionErrorr )�selfr r r �install� s zIOLoop.installc C s t td�rt`dS )zKClear the global `IOLoop` instance.
.. versionadded:: 4.0
r N)r r r r r r r �clear_instance� s
zIOLoop.clear_instanceTc C s& t tjdd�}|dkr"| r"tj� S |S )a� Returns the current thread's `IOLoop`.
If an `IOLoop` is currently running or has been marked as
current by `make_current`, returns that instance. If there is
no current `IOLoop`, returns `IOLoop.instance()` (i.e. the
main thread's `IOLoop`, creating one if necessary) if ``instance``
is true.
In general you should use `IOLoop.current` as the default when
constructing an asynchronous object, and use `IOLoop.instance`
when you mean to communicate to the main thread from a different
one.
.. versionchanged:: 4.1
Added ``instance`` argument to control the fallback to
`IOLoop.instance()`.
r! N)�getattrr �_currentr! )r! �currentr r r r) � s zIOLoop.currentc C s | t j_dS )a� Makes this the `IOLoop` for the current thread.
An `IOLoop` automatically becomes current for its thread
when it is started, but it is sometimes useful to call
`make_current` explicitly before starting the `IOLoop`,
so that code run at startup time can find the right
instance.
.. versionchanged:: 4.1
An `IOLoop` created while there is no current `IOLoop`
will automatically become current.
N)r r( r! )r$ r r r � make_current� s
zIOLoop.make_currentc C s d t j_d S )N)r r( r! r r r r �
clear_current� s zIOLoop.clear_currentc C s t S )N)r )�clsr r r �configurable_base� s zIOLoop.configurable_basec C s: ddl m} |S ttd�r*ddlm} |S ddlm } |S )Nr )� ZMQIOLoopZepoll)� EPollIOLoopZkqueue)� KQueueIOLoop)� SelectIOLoop)
Zzmq.eventloop.ioloopr. r �selectZtornado.platform.epollr/ Ztornado.platform.kqueuer0 Ztornado.platform.selectr1 )r, r. r/ r0 r1 r r r �configurable_default� s
zIOLoop.configurable_defaultNc C sJ |d kr"t jdd�d krF| j� n$|rFt jdd�d k r>td��| j� d S )NF)r! z current IOLoop already exists)r r) r* � RuntimeError)r$ r* r r r �
initialize� s
zIOLoop.initializeFc C s
t � �dS )a� Closes the `IOLoop`, freeing any resources used.
If ``all_fds`` is true, all file descriptors registered on the
IOLoop will be closed (not just the ones created by the
`IOLoop` itself).
Many applications will only use a single `IOLoop` that runs for the
entire lifetime of the process. In that case closing the `IOLoop`
is not necessary since everything will be cleaned up when the
process exits. `IOLoop.close` is provided mainly for scenarios
such as unit tests, which create and destroy a large number of
``IOLoops``.
An `IOLoop` must be completely stopped before it can be closed. This
means that `IOLoop.stop()` must be called *and* `IOLoop.start()` must
be allowed to return before attempting to call `IOLoop.close()`.
Therefore the call to `close` will usually appear just after
the call to `start` rather than near the call to `stop`.
.. versionchanged:: 3.1
If the `IOLoop` implementation supports non-integer objects
for "file descriptors", those objects will have their
``close`` method when ``all_fds`` is true.
N)�NotImplementedError)r$ �all_fdsr r r �close s z IOLoop.closec C s
t � �dS )a� Registers the given handler to receive the given events for ``fd``.
The ``fd`` argument may either be an integer file descriptor or
a file-like object with a ``fileno()`` method (and optionally a
``close()`` method, which may be called when the `IOLoop` is shut
down).
The ``events`` argument is a bitwise or of the constants
``IOLoop.READ``, ``IOLoop.WRITE``, and ``IOLoop.ERROR``.
When an event occurs, ``handler(fd, events)`` will be run.
.. versionchanged:: 4.0
Added the ability to pass file-like objects in addition to
raw file descriptors.
N)r6 )r$ �fd�handler�eventsr r r � add_handler s zIOLoop.add_handlerc C s
t � �dS )z�Changes the events we listen for ``fd``.
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raw file descriptors.
N)r6 )r$ r9 r; r r r �update_handler1 s zIOLoop.update_handlerc C s
t � �dS )z�Stop listening for events on ``fd``.
.. versionchanged:: 4.0
Added the ability to pass file-like objects in addition to
raw file descriptors.
N)r6 )r$ r9 r r r �remove_handler: s zIOLoop.remove_handlerc C s
t � �dS )a� Sends a signal if the `IOLoop` is blocked for more than
``s`` seconds.
Pass ``seconds=None`` to disable. Requires Python 2.6 on a unixy
platform.
The action parameter is a Python signal handler. Read the
documentation for the `signal` module for more information.
If ``action`` is None, the process will be killed if it is
blocked for too long.
N)r6 )r$ �seconds�actionr r r � set_blocking_signal_thresholdC s z$IOLoop.set_blocking_signal_thresholdc C s | j || j� dS )z�Logs a stack trace if the `IOLoop` is blocked for more than
``s`` seconds.
Equivalent to ``set_blocking_signal_threshold(seconds,
self.log_stack)``
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z#IOLoop blocked for %f seconds in
%s� N)r
Zwarning�_blocking_signal_threshold�join� traceback� format_stack)r$ �signal�framer r r rB Z s zIOLoop.log_stackc C s
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The loop will run until one of the callbacks calls `stop()`, which
will make the loop stop after the current event iteration completes.
N)r6 )r$ r r r �startc s z IOLoop.startc C s0 t tj� jtjd�jtjd�jg�s,tj� dS )a� The IOLoop catches and logs exceptions, so it's
important that log output be visible. However, python's
default behavior for non-root loggers (prior to python
3.2) is to print an unhelpful "no handlers could be
found" message rather than the actual log entry, so we
must explicitly configure logging if we've made it this
far without anything.
This method should be called from start() in subclasses.
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If the event loop is not currently running, the next call to `start()`
will return immediately.
To use asynchronous methods from otherwise-synchronous code (such as
unit tests), you can start and stop the event loop like this::
ioloop = IOLoop()
async_method(ioloop=ioloop, callback=ioloop.stop)
ioloop.start()
``ioloop.start()`` will return after ``async_method`` has run
its callback, whether that callback was invoked before or
after ``ioloop.start``.
Note that even after `stop` has been called, the `IOLoop` is not
completely stopped until `IOLoop.start` has also returned.
Some work that was scheduled before the call to `stop` may still
be run before the `IOLoop` shuts down.
N)r6 )r$ r r r �stop{ s z IOLoop.stopc s| dg�� ��fdd�}�j |� |dk r>�j�j� | �j�}�j� |dk rX�j|� �d j� sptd| ���d j� S )a Starts the `IOLoop`, runs the given function, and stops the loop.
The function must return either a yieldable object or
``None``. If the function returns a yieldable object, the
`IOLoop` will run until the yieldable is resolved (and
`run_sync()` will return the yieldable's result). If it raises
an exception, the `IOLoop` will stop and the exception will be
re-raised to the caller.
The keyword-only argument ``timeout`` may be used to set
a maximum duration for the function. If the timeout expires,
a `TimeoutError` is raised.
This method is useful in conjunction with `tornado.gen.coroutine`
to allow asynchronous calls in a ``main()`` function::
@gen.coroutine
def main():
# do stuff...
if __name__ == '__main__':
IOLoop.current().run_sync(main)
.. versionchanged:: 4.3
Returning a non-``None``, non-yieldable value is now an error.
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zIOLoop.run_syncc C s t j � S )a Returns the current time according to the `IOLoop`'s clock.
The return value is a floating-point number relative to an
unspecified time in the past.
By default, the `IOLoop`'s time function is `time.time`. However,
it may be configured to use e.g. `time.monotonic` instead.
Calls to `add_timeout` that pass a number instead of a
`datetime.timedelta` should use this function to compute the
appropriate time, so they can work no matter what time function
is chosen.
)r^ )r$ r r r r^ � s
z IOLoop.timec O s\ t |tj�r | j||f|�|�S t |tj�rL| j| j� t|� |f|�|�S td| ��dS )a� Runs the ``callback`` at the time ``deadline`` from the I/O loop.
Returns an opaque handle that may be passed to
`remove_timeout` to cancel.
``deadline`` may be a number denoting a time (on the same
scale as `IOLoop.time`, normally `time.time`), or a
`datetime.timedelta` object for a deadline relative to the
current time. Since Tornado 4.0, `call_later` is a more
convenient alternative for the relative case since it does not
require a timedelta object.
Note that it is not safe to call `add_timeout` from other threads.
Instead, you must use `add_callback` to transfer control to the
`IOLoop`'s thread, and then call `add_timeout` from there.
Subclasses of IOLoop must implement either `add_timeout` or
`call_at`; the default implementations of each will call
the other. `call_at` is usually easier to implement, but
subclasses that wish to maintain compatibility with Tornado
versions prior to 4.0 must use `add_timeout` instead.
.. versionchanged:: 4.0
Now passes through ``*args`` and ``**kwargs`` to the callback.
zUnsupported deadline %rN) �
isinstance�numbers�Real�call_at�datetimeZ timedeltar^ r � TypeError)r$ �deadline�callback�args�kwargsr r r r] � s zIOLoop.add_timeoutc O s | j | j� | |f|�|�S )a� Runs the ``callback`` after ``delay`` seconds have passed.
Returns an opaque handle that may be passed to `remove_timeout`
to cancel. Note that unlike the `asyncio` method of the same
name, the returned object does not have a ``cancel()`` method.
See `add_timeout` for comments on thread-safety and subclassing.
.. versionadded:: 4.0
)rf r^ )r$ Zdelayrj rk rl r r r �
call_later� s zIOLoop.call_laterc O s | j ||f|�|�S )a� Runs the ``callback`` at the absolute time designated by ``when``.
``when`` must be a number using the same reference point as
`IOLoop.time`.
Returns an opaque handle that may be passed to `remove_timeout`
to cancel. Note that unlike the `asyncio` method of the same
name, the returned object does not have a ``cancel()`` method.
See `add_timeout` for comments on thread-safety and subclassing.
.. versionadded:: 4.0
)r] )r$ Zwhenrj rk rl r r r rf s zIOLoop.call_atc C s
t � �dS )z�Cancels a pending timeout.
The argument is a handle as returned by `add_timeout`. It is
safe to call `remove_timeout` even if the callback has already
been run.
N)r6 )r$ ra r r r r_ s zIOLoop.remove_timeoutc O s
t � �dS )a3 Calls the given callback on the next I/O loop iteration.
It is safe to call this method from any thread at any time,
except from a signal handler. Note that this is the **only**
method in `IOLoop` that makes this thread-safety guarantee; all
other interaction with the `IOLoop` must be done from that
`IOLoop`'s thread. `add_callback()` may be used to transfer
control from other threads to the `IOLoop`'s thread.
To add a callback from a signal handler, see
`add_callback_from_signal`.
N)r6 )r$ rj rk rl r r r r\ ! s
zIOLoop.add_callbackc O s
t � �dS )aS Calls the given callback on the next I/O loop iteration.
Safe for use from a Python signal handler; should not be used
otherwise.
Callbacks added with this method will be run without any
`.stack_context`, to avoid picking up the context of the function
that was interrupted by the signal.
N)r6 )r$ rj rk rl r r r �add_callback_from_signal0 s
z IOLoop.add_callback_from_signalc
O s* t j� � | j|f|�|� W dQ R X dS )ag Calls the given callback on the next IOLoop iteration.
Unlike all other callback-related methods on IOLoop,
``spawn_callback`` does not associate the callback with its caller's
``stack_context``, so it is suitable for fire-and-forget callbacks
that should not interfere with the caller.
.. versionadded:: 4.0
N)r � NullContextr\ )r$ rj rk rl r r r �spawn_callback< s
zIOLoop.spawn_callbackc s. t |�s t�tj� �� |j� �fdd�� dS )z�Schedules a callback on the ``IOLoop`` when the given
`.Future` is finished.
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`.Future`.
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rr | j|� Y nX dS )zMRuns a callback with error handling.
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Nr )�genc S s | j � S )N)rX )�fr r r rS j s z&IOLoop._run_callback.<locals>.<lambda>)rL rr rQ Z
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_run_callbackU s zIOLoop._run_callbackc C s t jd|dd� dS )aU This method is called whenever a callback run by the `IOLoop`
throws an exception.
By default simply logs the exception as an error. Subclasses
may override this method to customize reporting of exceptions.
The exception itself is not passed explicitly, but is available
in `sys.exc_info`.
zException in callback %rT)rV N)r �error)r$ rj r r r rt n s
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r$ ||fS X dS )a� Returns an (fd, obj) pair from an ``fd`` parameter.
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input to `add_handler` and related methods. When a file-like
object is passed, we must retain the object itself so we can
close it correctly when the `IOLoop` shuts down, but the
poller interfaces favor file descriptors (they will accept
file-like objects and call ``fileno()`` for you, but they
always return the descriptor itself).
This method is provided for use by `IOLoop` subclasses and should
not generally be used by application code.
.. versionadded:: 4.0
N)�fileno�AttributeError)r$ r9 r r r �split_fdz s zIOLoop.split_fdc C sJ y0y |j � W n tk
r, tj |� Y nX W n tk
rD Y nX dS )ak Utility method to close an ``fd``.
If ``fd`` is a file-like object, we close it directly; otherwise
we use `os.close`.
This method is provided for use by `IOLoop` subclasses (in
implementations of ``IOLoop.close(all_fds=True)`` and should
not generally be used by application code.
.. versionadded:: 4.0
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PollIOLoopa Base class for IOLoops built around a select-like function.
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(Linux), `tornado.platform.kqueue.KQueueIOLoop` (BSD and Mac), or
`tornado.platform.select.SelectIOLoop` (all platforms).
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.. versionchanged:: 4.1
The ``io_loop`` argument is deprecated.
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.. versionadded:: 4.1
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