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File Name : events.py

"""Event loop and event loop policy."""

__all__ = ['AbstractEventLoopPolicy',
           'AbstractEventLoop', 'AbstractServer',
           'Handle', 'TimerHandle',
           'get_event_loop_policy', 'set_event_loop_policy',
           'get_event_loop', 'set_event_loop', 'new_event_loop',
           'get_child_watcher', 'set_child_watcher',
           '_set_running_loop', '_get_running_loop',
           ]

import functools
import inspect
import os
import reprlib
import socket
import subprocess
import sys
import threading
import traceback

from asyncio import compat

def _get_function_source(func):
    if compat.PY34:
        func = inspect.unwrap(func)
    elif hasattr(func, '__wrapped__'):
        func = func.__wrapped__
    if inspect.isfunction(func):
        code = func.__code__
        return (code.co_filename, code.co_firstlineno)
    if isinstance(func, functools.partial):
        return _get_function_source(func.func)
    if compat.PY34 and isinstance(func, functools.partialmethod):
        return _get_function_source(func.func)
    return None

def _format_args_and_kwargs(args, kwargs):
    """Format function arguments and keyword arguments.

Special case for a single parameter: ('hello',) is formatted as ('hello').
    """
    # use reprlib to limit the length of the output
    items = []
    if args:
        items.extend(reprlib.repr(arg) for arg in args)
    if kwargs:
        items.extend('{}={}'.format(k, reprlib.repr(v))
                     for k, v in kwargs.items())
    return '(' + ', '.join(items) + ')'

def _format_callback(func, args, kwargs, suffix=''):
    if isinstance(func, functools.partial):
        suffix = _format_args_and_kwargs(args, kwargs) + suffix
        return _format_callback(func.func, func.args, func.keywords, suffix)

if hasattr(func, '__qualname__'):
        func_repr = getattr(func, '__qualname__')
    elif hasattr(func, '__name__'):
        func_repr = getattr(func, '__name__')
    else:
        func_repr = repr(func)

func_repr += _format_args_and_kwargs(args, kwargs)
    if suffix:
        func_repr += suffix
    return func_repr

def _format_callback_source(func, args):
    func_repr = _format_callback(func, args, None)
    source = _get_function_source(func)
    if source:
        func_repr += ' at %s:%s' % source
    return func_repr

class Handle:
    """Object returned by callback registration methods."""

__slots__ = ('_callback', '_args', '_cancelled', '_loop',
                 '_source_traceback', '_repr', '__weakref__')

def __init__(self, callback, args, loop):
        self._loop = loop
        self._callback = callback
        self._args = args
        self._cancelled = False
        self._repr = None
        if self._loop.get_debug():
            self._source_traceback = traceback.extract_stack(sys._getframe(1))
        else:
            self._source_traceback = None

def _repr_info(self):
        info = [self.__class__.__name__]
        if self._cancelled:
            info.append('cancelled')
        if self._callback is not None:
            info.append(_format_callback_source(self._callback, self._args))
        if self._source_traceback:
            frame = self._source_traceback[-1]
            info.append('created at %s:%s' % (frame[0], frame[1]))
        return info

def __repr__(self):
        if self._repr is not None:
            return self._repr
        info = self._repr_info()
        return '<%s>' % ' '.join(info)

def cancel(self):
        if not self._cancelled:
            self._cancelled = True
            if self._loop.get_debug():
                # Keep a representation in debug mode to keep callback and
                # parameters. For example, to log the warning
                # "Executing <Handle...> took 2.5 second"
                self._repr = repr(self)
            self._callback = None
            self._args = None

def _run(self):
        try:
            self._callback(*self._args)
        except Exception as exc:
            cb = _format_callback_source(self._callback, self._args)
            msg = 'Exception in callback {}'.format(cb)
            context = {
                'message': msg,
                'exception': exc,
                'handle': self,
            }
            if self._source_traceback:
                context['source_traceback'] = self._source_traceback
            self._loop.call_exception_handler(context)
        self = None  # Needed to break cycles when an exception occurs.

class TimerHandle(Handle):
    """Object returned by timed callback registration methods."""

__slots__ = ['_scheduled', '_when']

def __init__(self, when, callback, args, loop):
        assert when is not None
        super().__init__(callback, args, loop)
        if self._source_traceback:
            del self._source_traceback[-1]
        self._when = when
        self._scheduled = False

def _repr_info(self):
        info = super()._repr_info()
        pos = 2 if self._cancelled else 1
        info.insert(pos, 'when=%s' % self._when)
        return info

def __hash__(self):
        return hash(self._when)

def __lt__(self, other):
        return self._when < other._when

def __le__(self, other):
        if self._when < other._when:
            return True
        return self.__eq__(other)

def __gt__(self, other):
        return self._when > other._when

def __ge__(self, other):
        if self._when > other._when:
            return True
        return self.__eq__(other)

def __eq__(self, other):
        if isinstance(other, TimerHandle):
            return (self._when == other._when and
                    self._callback == other._callback and
                    self._args == other._args and
                    self._cancelled == other._cancelled)
        return NotImplemented

def __ne__(self, other):
        equal = self.__eq__(other)
        return NotImplemented if equal is NotImplemented else not equal

def cancel(self):
        if not self._cancelled:
            self._loop._timer_handle_cancelled(self)
        super().cancel()

class AbstractServer:
    """Abstract server returned by create_server()."""

def close(self):
        """Stop serving.  This leaves existing connections open."""
        return NotImplemented

def wait_closed(self):
        """Coroutine to wait until service is closed."""
        return NotImplemented

class AbstractEventLoop:
    """Abstract event loop."""

# Running and stopping the event loop.

def run_forever(self):
        """Run the event loop until stop() is called."""
        raise NotImplementedError

def run_until_complete(self, future):
        """Run the event loop until a Future is done.

Return the Future's result, or raise its exception.
        """
        raise NotImplementedError

def stop(self):
        """Stop the event loop as soon as reasonable.

Exactly how soon that is may depend on the implementation, but
        no more I/O callbacks should be scheduled.
        """
        raise NotImplementedError

def is_running(self):
        """Return whether the event loop is currently running."""
        raise NotImplementedError

def is_closed(self):
        """Returns True if the event loop was closed."""
        raise NotImplementedError

def close(self):
        """Close the loop.

The loop should not be running.

This is idempotent and irreversible.

No other methods should be called after this one.
        """
        raise NotImplementedError

def shutdown_asyncgens(self):
        """Shutdown all active asynchronous generators."""
        raise NotImplementedError

# Methods scheduling callbacks.  All these return Handles.

def _timer_handle_cancelled(self, handle):
        """Notification that a TimerHandle has been cancelled."""
        raise NotImplementedError

def call_soon(self, callback, *args):
        return self.call_later(0, callback, *args)

def call_later(self, delay, callback, *args):
        raise NotImplementedError

def call_at(self, when, callback, *args):
        raise NotImplementedError

def time(self):
        raise NotImplementedError

def create_future(self):
        raise NotImplementedError

# Method scheduling a coroutine object: create a task.

def create_task(self, coro):
        raise NotImplementedError

# Methods for interacting with threads.

def call_soon_threadsafe(self, callback, *args):
        raise NotImplementedError

def run_in_executor(self, executor, func, *args):
        raise NotImplementedError

def set_default_executor(self, executor):
        raise NotImplementedError

# Network I/O methods returning Futures.

def getaddrinfo(self, host, port, *, family=0, type=0, proto=0, flags=0):
        raise NotImplementedError

def getnameinfo(self, sockaddr, flags=0):
        raise NotImplementedError

def create_connection(self, protocol_factory, host=None, port=None, *,
                          ssl=None, family=0, proto=0, flags=0, sock=None,
                          local_addr=None, server_hostname=None):
        raise NotImplementedError

def create_server(self, protocol_factory, host=None, port=None, *,
                      family=socket.AF_UNSPEC, flags=socket.AI_PASSIVE,
                      sock=None, backlog=100, ssl=None, reuse_address=None,
                      reuse_port=None):
        """A coroutine which creates a TCP server bound to host and port.

The return value is a Server object which can be used to stop
        the service.

If host is an empty string or None all interfaces are assumed
        and a list of multiple sockets will be returned (most likely
        one for IPv4 and another one for IPv6). The host parameter can also be a
        sequence (e.g. list) of hosts to bind to.

family can be set to either AF_INET or AF_INET6 to force the
        socket to use IPv4 or IPv6. If not set it will be determined
        from host (defaults to AF_UNSPEC).

flags is a bitmask for getaddrinfo().

sock can optionally be specified in order to use a preexisting
        socket object.

backlog is the maximum number of queued connections passed to
        listen() (defaults to 100).

ssl can be set to an SSLContext to enable SSL over the
        accepted connections.

reuse_address tells the kernel to reuse a local socket in
        TIME_WAIT state, without waiting for its natural timeout to
        expire. If not specified will automatically be set to True on
        UNIX.

reuse_port tells the kernel to allow this endpoint to be bound to
        the same port as other existing endpoints are bound to, so long as
        they all set this flag when being created. This option is not
        supported on Windows.
        """
        raise NotImplementedError

def create_unix_connection(self, protocol_factory, path, *,
                               ssl=None, sock=None,
                               server_hostname=None):
        raise NotImplementedError

def create_unix_server(self, protocol_factory, path, *,
                           sock=None, backlog=100, ssl=None):
        """A coroutine which creates a UNIX Domain Socket server.

The return value is a Server object, which can be used to stop
        the service.

path is a str, representing a file systsem path to bind the
        server socket to.

sock can optionally be specified in order to use a preexisting
        socket object.

backlog is the maximum number of queued connections passed to
        listen() (defaults to 100).

ssl can be set to an SSLContext to enable SSL over the
        accepted connections.
        """
        raise NotImplementedError

def create_datagram_endpoint(self, protocol_factory,
                                 local_addr=None, remote_addr=None, *,
                                 family=0, proto=0, flags=0,
                                 reuse_address=None, reuse_port=None,
                                 allow_broadcast=None, sock=None):
        """A coroutine which creates a datagram endpoint.

This method will try to establish the endpoint in the background.
        When successful, the coroutine returns a (transport, protocol) pair.

protocol_factory must be a callable returning a protocol instance.

socket family AF_INET or socket.AF_INET6 depending on host (or
        family if specified), socket type SOCK_DGRAM.

reuse_address tells the kernel to reuse a local socket in
        TIME_WAIT state, without waiting for its natural timeout to
        expire. If not specified it will automatically be set to True on
        UNIX.

allow_broadcast tells the kernel to allow this endpoint to send
        messages to the broadcast address.

sock can optionally be specified in order to use a preexisting
        socket object.
        """
        raise NotImplementedError

# Pipes and subprocesses.

def connect_read_pipe(self, protocol_factory, pipe):
        """Register read pipe in event loop. Set the pipe to non-blocking mode.

protocol_factory should instantiate object with Protocol interface.
        pipe is a file-like object.
        Return pair (transport, protocol), where transport supports the
        ReadTransport interface."""
        # The reason to accept file-like object instead of just file descriptor
        # is: we need to own pipe and close it at transport finishing
        # Can got complicated errors if pass f.fileno(),
        # close fd in pipe transport then close f and vise versa.
        raise NotImplementedError

def connect_write_pipe(self, protocol_factory, pipe):
        """Register write pipe in event loop.

protocol_factory should instantiate object with BaseProtocol interface.
        Pipe is file-like object already switched to nonblocking.
        Return pair (transport, protocol), where transport support
        WriteTransport interface."""
        # The reason to accept file-like object instead of just file descriptor
        # is: we need to own pipe and close it at transport finishing
        # Can got complicated errors if pass f.fileno(),
        # close fd in pipe transport then close f and vise versa.
        raise NotImplementedError

def subprocess_shell(self, protocol_factory, cmd, *, stdin=subprocess.PIPE,
                         stdout=subprocess.PIPE, stderr=subprocess.PIPE,
                         **kwargs):
        raise NotImplementedError

def subprocess_exec(self, protocol_factory, *args, stdin=subprocess.PIPE,
                        stdout=subprocess.PIPE, stderr=subprocess.PIPE,
                        **kwargs):
        raise NotImplementedError

# Ready-based callback registration methods.
    # The add_*() methods return None.
    # The remove_*() methods return True if something was removed,
    # False if there was nothing to delete.

def add_reader(self, fd, callback, *args):
        raise NotImplementedError

def remove_reader(self, fd):
        raise NotImplementedError

def add_writer(self, fd, callback, *args):
        raise NotImplementedError

def remove_writer(self, fd):
        raise NotImplementedError

# Completion based I/O methods returning Futures.

def sock_recv(self, sock, nbytes):
        raise NotImplementedError

def sock_sendall(self, sock, data):
        raise NotImplementedError

def sock_connect(self, sock, address):
        raise NotImplementedError

def sock_accept(self, sock):
        raise NotImplementedError

# Signal handling.

def add_signal_handler(self, sig, callback, *args):
        raise NotImplementedError

def remove_signal_handler(self, sig):
        raise NotImplementedError

# Task factory.

def set_task_factory(self, factory):
        raise NotImplementedError

def get_task_factory(self):
        raise NotImplementedError

# Error handlers.

def get_exception_handler(self):
        raise NotImplementedError

def set_exception_handler(self, handler):
        raise NotImplementedError

def default_exception_handler(self, context):
        raise NotImplementedError

def call_exception_handler(self, context):
        raise NotImplementedError

# Debug flag management.

def get_debug(self):
        raise NotImplementedError

def set_debug(self, enabled):
        raise NotImplementedError

class AbstractEventLoopPolicy:
    """Abstract policy for accessing the event loop."""

def get_event_loop(self):
        """Get the event loop for the current context.

Returns an event loop object implementing the BaseEventLoop interface,
        or raises an exception in case no event loop has been set for the
        current context and the current policy does not specify to create one.

It should never return None."""
        raise NotImplementedError

def set_event_loop(self, loop):
        """Set the event loop for the current context to loop."""
        raise NotImplementedError

def new_event_loop(self):
        """Create and return a new event loop object according to this
        policy's rules. If there's need to set this loop as the event loop for
        the current context, set_event_loop must be called explicitly."""
        raise NotImplementedError

# Child processes handling (Unix only).

def get_child_watcher(self):
        "Get the watcher for child processes."
        raise NotImplementedError

def set_child_watcher(self, watcher):
        """Set the watcher for child processes."""
        raise NotImplementedError

class BaseDefaultEventLoopPolicy(AbstractEventLoopPolicy):
    """Default policy implementation for accessing the event loop.

In this policy, each thread has its own event loop.  However, we
    only automatically create an event loop by default for the main
    thread; other threads by default have no event loop.

Other policies may have different rules (e.g. a single global
    event loop, or automatically creating an event loop per thread, or
    using some other notion of context to which an event loop is
    associated).
    """

_loop_factory = None

class _Local(threading.local):
        _loop = None
        _set_called = False

def __init__(self):
        self._local = self._Local()

def get_event_loop(self):
        """Get the event loop.

This may be None or an instance of EventLoop.
        """
        if (self._local._loop is None and
            not self._local._set_called and
            isinstance(threading.current_thread(), threading._MainThread)):
            self.set_event_loop(self.new_event_loop())
        if self._local._loop is None:
            raise RuntimeError('There is no current event loop in thread %r.'
                               % threading.current_thread().name)
        return self._local._loop

def set_event_loop(self, loop):
        """Set the event loop."""
        self._local._set_called = True
        assert loop is None or isinstance(loop, AbstractEventLoop)
        self._local._loop = loop

def new_event_loop(self):
        """Create a new event loop.

You must call set_event_loop() to make this the current event
        loop.
        """
        return self._loop_factory()

# Event loop policy.  The policy itself is always global, even if the
# policy's rules say that there is an event loop per thread (or other
# notion of context).  The default policy is installed by the first
# call to get_event_loop_policy().
_event_loop_policy = None

# Lock for protecting the on-the-fly creation of the event loop policy.
_lock = threading.Lock()

# A TLS for the running event loop, used by _get_running_loop.
class _RunningLoop(threading.local):
    _loop = None
    _pid = None

_running_loop = _RunningLoop()

def _get_running_loop():
    """Return the running event loop or None.

This is a low-level function intended to be used by event loops.
    This function is thread-specific.
    """
    running_loop = _running_loop._loop
    if running_loop is not None and _running_loop._pid == os.getpid():
        return running_loop

def _set_running_loop(loop):
    """Set the running event loop.

This is a low-level function intended to be used by event loops.
    This function is thread-specific.
    """
    _running_loop._pid = os.getpid()
    _running_loop._loop = loop

def _init_event_loop_policy():
    global _event_loop_policy
    with _lock:
        if _event_loop_policy is None:  # pragma: no branch
            from . import DefaultEventLoopPolicy
            _event_loop_policy = DefaultEventLoopPolicy()

def get_event_loop_policy():
    """Get the current event loop policy."""
    if _event_loop_policy is None:
        _init_event_loop_policy()
    return _event_loop_policy

def set_event_loop_policy(policy):
    """Set the current event loop policy.

If policy is None, the default policy is restored."""
    global _event_loop_policy
    assert policy is None or isinstance(policy, AbstractEventLoopPolicy)
    _event_loop_policy = policy

def get_event_loop():
    """Return an asyncio event loop.

When called from a coroutine or a callback (e.g. scheduled with call_soon
    or similar API), this function will always return the running event loop.

If there is no running event loop set, the function will return
    the result of `get_event_loop_policy().get_event_loop()` call.
    """
    current_loop = _get_running_loop()
    if current_loop is not None:
        return current_loop
    return get_event_loop_policy().get_event_loop()

def set_event_loop(loop):
    """Equivalent to calling get_event_loop_policy().set_event_loop(loop)."""
    get_event_loop_policy().set_event_loop(loop)

def new_event_loop():
    """Equivalent to calling get_event_loop_policy().new_event_loop()."""
    return get_event_loop_policy().new_event_loop()

def get_child_watcher():
    """Equivalent to calling get_event_loop_policy().get_child_watcher()."""
    return get_event_loop_policy().get_child_watcher()

def set_child_watcher(watcher):
    """Equivalent to calling
    get_event_loop_policy().set_child_watcher(watcher)."""
    return get_event_loop_policy().set_child_watcher(watcher)

Name	Type	Size	Permission	Last Modified	Actions
.	dir	-	0755	2024-08-12 05:00:46
..	dir	-	0755	2024-08-12 05:00:46
__pycache__	dir	-	0755	2024-08-12 05:00:46
__init__.py	text/plain	1.4 KB	0644	2024-05-31 01:51:45
base_events.py	text/plain	55.13 KB	0644	2024-05-31 01:51:45
base_subprocess.py	text/x-script.python	8.84 KB	0644	2024-05-31 01:51:45
compat.py	text/plain	543 B	0644	2024-05-31 01:51:45
constants.py	text/plain	195 B	0644	2024-05-31 01:51:45
coroutines.py	text/x-script.python	10.47 KB	0644	2024-05-31 01:51:45
events.py	text/plain	22.33 KB	0644	2024-05-31 01:51:45
futures.py	text/plain	17.16 KB	0644	2024-05-31 01:51:46
locks.py	text/plain	14.65 KB	0644	2024-05-31 01:51:45
log.py	text/plain	124 B	0644	2024-05-31 01:51:46
proactor_events.py	text/plain	19.66 KB	0644	2024-05-31 01:51:45
protocols.py	text/plain	4.41 KB	0644	2024-05-31 01:51:45
queues.py	text/plain	7.64 KB	0644	2024-05-31 01:51:45
selector_events.py	text/plain	40.91 KB	0644	2024-05-31 01:51:45
sslproto.py	text/x-script.python	25.34 KB	0644	2024-05-31 01:51:45
streams.py	text/plain	23.73 KB	0644	2024-05-31 01:51:45
subprocess.py	text/x-script.python	7.45 KB	0644	2024-05-31 01:51:45
tasks.py	text/plain	25.93 KB	0644	2024-05-31 01:51:45
test_utils.py	text/plain	14.19 KB	0644	2024-05-31 01:51:45
transports.py	text/plain	9.83 KB	0644	2024-05-31 01:51:45
unix_events.py	text/plain	35.89 KB	0644	2024-05-31 01:51:46
windows_events.py	text/plain	27.04 KB	0644	2024-05-31 01:51:46
windows_utils.py	text/plain	6.68 KB	0644	2024-05-31 01:51:46