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Edit File: selector_events.py

"""Event loop using a selector and related classes.

A selector is a "notify-when-ready" multiplexer.  For a subclass which
also includes support for signal handling, see the unix_events sub-module.
"""

__all__ = ['BaseSelectorEventLoop']

import collections
import errno
import functools
import socket
import warnings
import weakref
try:
    import ssl
except ImportError:  # pragma: no cover
    ssl = None

from . import base_events
from . import compat
from . import constants
from . import events
from . import futures
from . import selectors
from . import transports
from . import sslproto
from .coroutines import coroutine
from .log import logger

def _test_selector_event(selector, fd, event):
    # Test if the selector is monitoring 'event' events
    # for the file descriptor 'fd'.
    try:
        key = selector.get_key(fd)
    except KeyError:
        return False
    else:
        return bool(key.events & event)

if hasattr(socket, 'TCP_NODELAY'):
    def _set_nodelay(sock):
        if (sock.family in {socket.AF_INET, socket.AF_INET6} and
                sock.type == socket.SOCK_STREAM and
                sock.proto == socket.IPPROTO_TCP):
            sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
else:
    def _set_nodelay(sock):
        pass

class BaseSelectorEventLoop(base_events.BaseEventLoop):
    """Selector event loop.

See events.EventLoop for API specification.
    """

def __init__(self, selector=None):
        super().__init__()

if selector is None:
            selector = selectors.DefaultSelector()
        logger.debug('Using selector: %s', selector.__class__.__name__)
        self._selector = selector
        self._make_self_pipe()
        self._transports = weakref.WeakValueDictionary()

def _make_socket_transport(self, sock, protocol, waiter=None, *,
                               extra=None, server=None):
        return _SelectorSocketTransport(self, sock, protocol, waiter,
                                        extra, server)

def _make_ssl_transport(self, rawsock, protocol, sslcontext, waiter=None,
                            *, server_side=False, server_hostname=None,
                            extra=None, server=None):
        if not sslproto._is_sslproto_available():
            return self._make_legacy_ssl_transport(
                rawsock, protocol, sslcontext, waiter,
                server_side=server_side, server_hostname=server_hostname,
                extra=extra, server=server)

ssl_protocol = sslproto.SSLProtocol(self, protocol, sslcontext, waiter,
                                            server_side, server_hostname)
        _SelectorSocketTransport(self, rawsock, ssl_protocol,
                                 extra=extra, server=server)
        return ssl_protocol._app_transport

def _make_legacy_ssl_transport(self, rawsock, protocol, sslcontext,
                                   waiter, *,
                                   server_side=False, server_hostname=None,
                                   extra=None, server=None):
        # Use the legacy API: SSL_write, SSL_read, etc. The legacy API is used
        # on Python 3.4 and older, when ssl.MemoryBIO is not available.
        return _SelectorSslTransport(
            self, rawsock, protocol, sslcontext, waiter,
            server_side, server_hostname, extra, server)

def _make_datagram_transport(self, sock, protocol,
                                 address=None, waiter=None, extra=None):
        return _SelectorDatagramTransport(self, sock, protocol,
                                          address, waiter, extra)

def close(self):
        if self.is_running():
            raise RuntimeError("Cannot close a running event loop")
        if self.is_closed():
            return
        self._close_self_pipe()
        super().close()
        if self._selector is not None:
            self._selector.close()
            self._selector = None

def _socketpair(self):
        raise NotImplementedError

def _close_self_pipe(self):
        self._remove_reader(self._ssock.fileno())
        self._ssock.close()
        self._ssock = None
        self._csock.close()
        self._csock = None
        self._internal_fds -= 1

def _make_self_pipe(self):
        # A self-socket, really. :-)
        self._ssock, self._csock = self._socketpair()
        self._ssock.setblocking(False)
        self._csock.setblocking(False)
        self._internal_fds += 1
        self._add_reader(self._ssock.fileno(), self._read_from_self)

def _process_self_data(self, data):
        pass

def _read_from_self(self):
        while True:
            try:
                data = self._ssock.recv(4096)
                if not data:
                    break
                self._process_self_data(data)
            except InterruptedError:
                continue
            except BlockingIOError:
                break

def _write_to_self(self):
        # This may be called from a different thread, possibly after
        # _close_self_pipe() has been called or even while it is
        # running.  Guard for self._csock being None or closed.  When
        # a socket is closed, send() raises OSError (with errno set to
        # EBADF, but let's not rely on the exact error code).
        csock = self._csock
        if csock is not None:
            try:
                csock.send(b'\0')
            except OSError:
                if self._debug:
                    logger.debug("Fail to write a null byte into the "
                                 "self-pipe socket",
                                 exc_info=True)

def _start_serving(self, protocol_factory, sock,
                       sslcontext=None, server=None, backlog=100):
        self._add_reader(sock.fileno(), self._accept_connection,
                         protocol_factory, sock, sslcontext, server, backlog)

def _accept_connection(self, protocol_factory, sock,
                           sslcontext=None, server=None, backlog=100):
        # This method is only called once for each event loop tick where the
        # listening socket has triggered an EVENT_READ. There may be multiple
        # connections waiting for an .accept() so it is called in a loop.
        # See https://bugs.python.org/issue27906 for more details.
        for _ in range(backlog):
            try:
                conn, addr = sock.accept()
                if self._debug:
                    logger.debug("%r got a new connection from %r: %r",
                                 server, addr, conn)
                conn.setblocking(False)
            except (BlockingIOError, InterruptedError, ConnectionAbortedError):
                # Early exit because the socket accept buffer is empty.
                return None
            except OSError as exc:
                # There's nowhere to send the error, so just log it.
                if exc.errno in (errno.EMFILE, errno.ENFILE,
                                 errno.ENOBUFS, errno.ENOMEM):
                    # Some platforms (e.g. Linux keep reporting the FD as
                    # ready, so we remove the read handler temporarily.
                    # We'll try again in a while.
                    self.call_exception_handler({
                        'message': 'socket.accept() out of system resource',
                        'exception': exc,
                        'socket': sock,
                    })
                    self._remove_reader(sock.fileno())
                    self.call_later(constants.ACCEPT_RETRY_DELAY,
                                    self._start_serving,
                                    protocol_factory, sock, sslcontext, server,
                                    backlog)
                else:
                    raise  # The event loop will catch, log and ignore it.
            else:
                extra = {'peername': addr}
                accept = self._accept_connection2(protocol_factory, conn, extra,
                                                  sslcontext, server)
                self.create_task(accept)

@coroutine
    def _accept_connection2(self, protocol_factory, conn, extra,
                            sslcontext=None, server=None):
        protocol = None
        transport = None
        try:
            protocol = protocol_factory()
            waiter = self.create_future()
            if sslcontext:
                transport = self._make_ssl_transport(
                    conn, protocol, sslcontext, waiter=waiter,
                    server_side=True, extra=extra, server=server)
            else:
                transport = self._make_socket_transport(
                    conn, protocol, waiter=waiter, extra=extra,
                    server=server)

try:
                yield from waiter
            except:
                transport.close()
                raise

# It's now up to the protocol to handle the connection.
        except Exception as exc:
            if self._debug:
                context = {
                    'message': ('Error on transport creation '
                                'for incoming connection'),
                    'exception': exc,
                }
                if protocol is not None:
                    context['protocol'] = protocol
                if transport is not None:
                    context['transport'] = transport
                self.call_exception_handler(context)

def _ensure_fd_no_transport(self, fd):
        try:
            transport = self._transports[fd]
        except KeyError:
            pass
        else:
            if not transport.is_closing():
                raise RuntimeError(
                    'File descriptor {!r} is used by transport {!r}'.format(
                        fd, transport))

def _add_reader(self, fd, callback, *args):
        self._check_closed()
        handle = events.Handle(callback, args, self)
        try:
            key = self._selector.get_key(fd)
        except KeyError:
            self._selector.register(fd, selectors.EVENT_READ,
                                    (handle, None))
        else:
            mask, (reader, writer) = key.events, key.data
            self._selector.modify(fd, mask | selectors.EVENT_READ,
                                  (handle, writer))
            if reader is not None:
                reader.cancel()

def _remove_reader(self, fd):
        if self.is_closed():
            return False
        try:
            key = self._selector.get_key(fd)
        except KeyError:
            return False
        else:
            mask, (reader, writer) = key.events, key.data
            mask &= ~selectors.EVENT_READ
            if not mask:
                self._selector.unregister(fd)
            else:
                self._selector.modify(fd, mask, (None, writer))

if reader is not None:
                reader.cancel()
                return True
            else:
                return False

def _add_writer(self, fd, callback, *args):
        self._check_closed()
        handle = events.Handle(callback, args, self)
        try:
            key = self._selector.get_key(fd)
        except KeyError:
            self._selector.register(fd, selectors.EVENT_WRITE,
                                    (None, handle))
        else:
            mask, (reader, writer) = key.events, key.data
            self._selector.modify(fd, mask | selectors.EVENT_WRITE,
                                  (reader, handle))
            if writer is not None:
                writer.cancel()

def _remove_writer(self, fd):
        """Remove a writer callback."""
        if self.is_closed():
            return False
        try:
            key = self._selector.get_key(fd)
        except KeyError:
            return False
        else:
            mask, (reader, writer) = key.events, key.data
            # Remove both writer and connector.
            mask &= ~selectors.EVENT_WRITE
            if not mask:
                self._selector.unregister(fd)
            else:
                self._selector.modify(fd, mask, (reader, None))

if writer is not None:
                writer.cancel()
                return True
            else:
                return False

def add_reader(self, fd, callback, *args):
        """Add a reader callback."""
        self._ensure_fd_no_transport(fd)
        return self._add_reader(fd, callback, *args)

def remove_reader(self, fd):
        """Remove a reader callback."""
        self._ensure_fd_no_transport(fd)
        return self._remove_reader(fd)

def add_writer(self, fd, callback, *args):
        """Add a writer callback.."""
        self._ensure_fd_no_transport(fd)
        return self._add_writer(fd, callback, *args)

def remove_writer(self, fd):
        """Remove a writer callback."""
        self._ensure_fd_no_transport(fd)
        return self._remove_writer(fd)

def sock_recv(self, sock, n):
        """Receive data from the socket.

The return value is a bytes object representing the data received.
        The maximum amount of data to be received at once is specified by
        nbytes.

This method is a coroutine.
        """
        if self._debug and sock.gettimeout() != 0:
            raise ValueError("the socket must be non-blocking")
        fut = self.create_future()
        self._sock_recv(fut, False, sock, n)
        return fut

def _sock_recv(self, fut, registered, sock, n):
        # _sock_recv() can add itself as an I/O callback if the operation can't
        # be done immediately. Don't use it directly, call sock_recv().
        fd = sock.fileno()
        if registered:
            # Remove the callback early.  It should be rare that the
            # selector says the fd is ready but the call still returns
            # EAGAIN, and I am willing to take a hit in that case in
            # order to simplify the common case.
            self.remove_reader(fd)
        if fut.cancelled():
            return
        try:
            data = sock.recv(n)
        except (BlockingIOError, InterruptedError):
            self.add_reader(fd, self._sock_recv, fut, True, sock, n)
        except Exception as exc:
            fut.set_exception(exc)
        else:
            fut.set_result(data)

def sock_sendall(self, sock, data):
        """Send data to the socket.

The socket must be connected to a remote socket. This method continues
        to send data from data until either all data has been sent or an
        error occurs. None is returned on success. On error, an exception is
        raised, and there is no way to determine how much data, if any, was
        successfully processed by the receiving end of the connection.

This method is a coroutine.
        """
        if self._debug and sock.gettimeout() != 0:
            raise ValueError("the socket must be non-blocking")
        fut = self.create_future()
        if data:
            self._sock_sendall(fut, False, sock, data)
        else:
            fut.set_result(None)
        return fut

def _sock_sendall(self, fut, registered, sock, data):
        fd = sock.fileno()

if registered:
            self.remove_writer(fd)
        if fut.cancelled():
            return

try:
            n = sock.send(data)
        except (BlockingIOError, InterruptedError):
            n = 0
        except Exception as exc:
            fut.set_exception(exc)
            return

if n == len(data):
            fut.set_result(None)
        else:
            if n:
                data = data[n:]
            self.add_writer(fd, self._sock_sendall, fut, True, sock, data)

@coroutine
    def sock_connect(self, sock, address):
        """Connect to a remote socket at address.

This method is a coroutine.
        """
        if self._debug and sock.gettimeout() != 0:
            raise ValueError("the socket must be non-blocking")

if not hasattr(socket, 'AF_UNIX') or sock.family != socket.AF_UNIX:
            resolved = base_events._ensure_resolved(
                address, family=sock.family, proto=sock.proto, loop=self)
            if not resolved.done():
                yield from resolved
            _, _, _, _, address = resolved.result()[0]

fut = self.create_future()
        self._sock_connect(fut, sock, address)
        return (yield from fut)

def _sock_connect(self, fut, sock, address):
        fd = sock.fileno()
        try:
            sock.connect(address)
        except (BlockingIOError, InterruptedError):
            # Issue #23618: When the C function connect() fails with EINTR, the
            # connection runs in background. We have to wait until the socket
            # becomes writable to be notified when the connection succeed or
            # fails.
            fut.add_done_callback(
                functools.partial(self._sock_connect_done, fd))
            self.add_writer(fd, self._sock_connect_cb, fut, sock, address)
        except Exception as exc:
            fut.set_exception(exc)
        else:
            fut.set_result(None)

def _sock_connect_done(self, fd, fut):
        self.remove_writer(fd)

def _sock_connect_cb(self, fut, sock, address):
        if fut.cancelled():
            return

try:
            err = sock.getsockopt(socket.SOL_SOCKET, socket.SO_ERROR)
            if err != 0:
                # Jump to any except clause below.
                raise OSError(err, 'Connect call failed %s' % (address,))
        except (BlockingIOError, InterruptedError):
            # socket is still registered, the callback will be retried later
            pass
        except Exception as exc:
            fut.set_exception(exc)
        else:
            fut.set_result(None)

def sock_accept(self, sock):
        """Accept a connection.

The socket must be bound to an address and listening for connections.
        The return value is a pair (conn, address) where conn is a new socket
        object usable to send and receive data on the connection, and address
        is the address bound to the socket on the other end of the connection.

This method is a coroutine.
        """
        if self._debug and sock.gettimeout() != 0:
            raise ValueError("the socket must be non-blocking")
        fut = self.create_future()
        self._sock_accept(fut, False, sock)
        return fut

def _sock_accept(self, fut, registered, sock):
        fd = sock.fileno()
        if registered:
            self.remove_reader(fd)
        if fut.cancelled():
            return
        try:
            conn, address = sock.accept()
            conn.setblocking(False)
        except (BlockingIOError, InterruptedError):
            self.add_reader(fd, self._sock_accept, fut, True, sock)
        except Exception as exc:
            fut.set_exception(exc)
        else:
            fut.set_result((conn, address))

def _process_events(self, event_list):
        for key, mask in event_list:
            fileobj, (reader, writer) = key.fileobj, key.data
            if mask & selectors.EVENT_READ and reader is not None:
                if reader._cancelled:
                    self._remove_reader(fileobj)
                else:
                    self._add_callback(reader)
            if mask & selectors.EVENT_WRITE and writer is not None:
                if writer._cancelled:
                    self._remove_writer(fileobj)
                else:
                    self._add_callback(writer)

def _stop_serving(self, sock):
        self._remove_reader(sock.fileno())
        sock.close()

class _SelectorTransport(transports._FlowControlMixin,
                         transports.Transport):

max_size = 256 * 1024  # Buffer size passed to recv().

_buffer_factory = bytearray  # Constructs initial value for self._buffer.

# Attribute used in the destructor: it must be set even if the constructor
    # is not called (see _SelectorSslTransport which may start by raising an
    # exception)
    _sock = None

def __init__(self, loop, sock, protocol, extra=None, server=None):
        super().__init__(extra, loop)
        self._extra['socket'] = sock
        self._extra['sockname'] = sock.getsockname()
        if 'peername' not in self._extra:
            try:
                self._extra['peername'] = sock.getpeername()
            except socket.error:
                self._extra['peername'] = None
        self._sock = sock
        self._sock_fd = sock.fileno()
        self._protocol = protocol
        self._protocol_connected = True
        self._server = server
        self._buffer = self._buffer_factory()
        self._conn_lost = 0  # Set when call to connection_lost scheduled.
        self._closing = False  # Set when close() called.
        if self._server is not None:
            self._server._attach()
        loop._transports[self._sock_fd] = self

def __repr__(self):
        info = [self.__class__.__name__]
        if self._sock is None:
            info.append('closed')
        elif self._closing:
            info.append('closing')
        info.append('fd=%s' % self._sock_fd)
        # test if the transport was closed
        if self._loop is not None and not self._loop.is_closed():
            polling = _test_selector_event(self._loop._selector,
                                           self._sock_fd, selectors.EVENT_READ)
            if polling:
                info.append('read=polling')
            else:
                info.append('read=idle')

polling = _test_selector_event(self._loop._selector,
                                           self._sock_fd,
                                           selectors.EVENT_WRITE)
            if polling:
                state = 'polling'
            else:
                state = 'idle'

bufsize = self.get_write_buffer_size()
            info.append('write=<%s, bufsize=%s>' % (state, bufsize))
        return '<%s>' % ' '.join(info)

def abort(self):
        self._force_close(None)

def set_protocol(self, protocol):
        self._protocol = protocol

def get_protocol(self):
        return self._protocol

def is_closing(self):
        return self._closing

def close(self):
        if self._closing:
            return
        self._closing = True
        self._loop._remove_reader(self._sock_fd)
        if not self._buffer:
            self._conn_lost += 1
            self._loop._remove_writer(self._sock_fd)
            self._loop.call_soon(self._call_connection_lost, None)

# On Python 3.3 and older, objects with a destructor part of a reference
    # cycle are never destroyed. It's not more the case on Python 3.4 thanks
    # to the PEP 442.
    if compat.PY34:
        def __del__(self):
            if self._sock is not None:
                warnings.warn("unclosed transport %r" % self, ResourceWarning)
                self._sock.close()

def _fatal_error(self, exc, message='Fatal error on transport'):
        # Should be called from exception handler only.
        if isinstance(exc, base_events._FATAL_ERROR_IGNORE):
            if self._loop.get_debug():
                logger.debug("%r: %s", self, message, exc_info=True)
        else:
            self._loop.call_exception_handler({
                'message': message,
                'exception': exc,
                'transport': self,
                'protocol': self._protocol,
            })
        self._force_close(exc)

def _force_close(self, exc):
        if self._conn_lost:
            return
        if self._buffer:
            self._buffer.clear()
            self._loop._remove_writer(self._sock_fd)
        if not self._closing:
            self._closing = True
            self._loop._remove_reader(self._sock_fd)
        self._conn_lost += 1
        self._loop.call_soon(self._call_connection_lost, exc)

def _call_connection_lost(self, exc):
        try:
            if self._protocol_connected:
                self._protocol.connection_lost(exc)
        finally:
            self._sock.close()
            self._sock = None
            self._protocol = None
            self._loop = None
            server = self._server
            if server is not None:
                server._detach()
                self._server = None

def get_write_buffer_size(self):
        return len(self._buffer)

class _SelectorSocketTransport(_SelectorTransport):

def __init__(self, loop, sock, protocol, waiter=None,
                 extra=None, server=None):
        super().__init__(loop, sock, protocol, extra, server)
        self._eof = False
        self._paused = False

# Disable the Nagle algorithm -- small writes will be
        # sent without waiting for the TCP ACK.  This generally
        # decreases the latency (in some cases significantly.)
        _set_nodelay(self._sock)

self._loop.call_soon(self._protocol.connection_made, self)
        # only start reading when connection_made() has been called
        self._loop.call_soon(self._loop._add_reader,
                             self._sock_fd, self._read_ready)
        if waiter is not None:
            # only wake up the waiter when connection_made() has been called
            self._loop.call_soon(futures._set_result_unless_cancelled,
                                 waiter, None)

def pause_reading(self):
        if self._closing:
            raise RuntimeError('Cannot pause_reading() when closing')
        if self._paused:
            raise RuntimeError('Already paused')
        self._paused = True
        self._loop._remove_reader(self._sock_fd)
        if self._loop.get_debug():
            logger.debug("%r pauses reading", self)

def resume_reading(self):
        if not self._paused:
            raise RuntimeError('Not paused')
        self._paused = False
        if self._closing:
            return
        self._loop._add_reader(self._sock_fd, self._read_ready)
        if self._loop.get_debug():
            logger.debug("%r resumes reading", self)

def _read_ready(self):
        if self._conn_lost:
            return
        try:
            data = self._sock.recv(self.max_size)
        except (BlockingIOError, InterruptedError):
            pass
        except Exception as exc:
            self._fatal_error(exc, 'Fatal read error on socket transport')
        else:
            if data:
                self._protocol.data_received(data)
            else:
                if self._loop.get_debug():
                    logger.debug("%r received EOF", self)
                keep_open = self._protocol.eof_received()
                if keep_open:
                    # We're keeping the connection open so the
                    # protocol can write more, but we still can't
                    # receive more, so remove the reader callback.
                    self._loop._remove_reader(self._sock_fd)
                else:
                    self.close()

def write(self, data):
        if not isinstance(data, (bytes, bytearray, memoryview)):
            raise TypeError('data argument must be a bytes-like object, '
                            'not %r' % type(data).__name__)
        if self._eof:
            raise RuntimeError('Cannot call write() after write_eof()')
        if not data:
            return

if self._conn_lost:
            if self._conn_lost >= constants.LOG_THRESHOLD_FOR_CONNLOST_WRITES:
                logger.warning('socket.send() raised exception.')
            self._conn_lost += 1
            return

if not self._buffer:
            # Optimization: try to send now.
            try:
                n = self._sock.send(data)
            except (BlockingIOError, InterruptedError):
                pass
            except Exception as exc:
                self._fatal_error(exc, 'Fatal write error on socket transport')
                return
            else:
                data = data[n:]
                if not data:
                    return
            # Not all was written; register write handler.
            self._loop._add_writer(self._sock_fd, self._write_ready)

# Add it to the buffer.
        self._buffer.extend(data)
        self._maybe_pause_protocol()

def _write_ready(self):
        assert self._buffer, 'Data should not be empty'

if self._conn_lost:
            return
        try:
            n = self._sock.send(self._buffer)
        except (BlockingIOError, InterruptedError):
            pass
        except Exception as exc:
            self._loop._remove_writer(self._sock_fd)
            self._buffer.clear()
            self._fatal_error(exc, 'Fatal write error on socket transport')
        else:
            if n:
                del self._buffer[:n]
            self._maybe_resume_protocol()  # May append to buffer.
            if not self._buffer:
                self._loop._remove_writer(self._sock_fd)
                if self._closing:
                    self._call_connection_lost(None)
                elif self._eof:
                    self._sock.shutdown(socket.SHUT_WR)

def write_eof(self):
        if self._eof:
            return
        self._eof = True
        if not self._buffer:
            self._sock.shutdown(socket.SHUT_WR)

def can_write_eof(self):
        return True

class _SelectorSslTransport(_SelectorTransport):

_buffer_factory = bytearray

def __init__(self, loop, rawsock, protocol, sslcontext, waiter=None,
                 server_side=False, server_hostname=None,
                 extra=None, server=None):
        if ssl is None:
            raise RuntimeError('stdlib ssl module not available')

if not sslcontext:
            sslcontext = sslproto._create_transport_context(server_side, server_hostname)

wrap_kwargs = {
            'server_side': server_side,
            'do_handshake_on_connect': False,
        }
        if server_hostname and not server_side:
            wrap_kwargs['server_hostname'] = server_hostname
        sslsock = sslcontext.wrap_socket(rawsock, **wrap_kwargs)

super().__init__(loop, sslsock, protocol, extra, server)
        # the protocol connection is only made after the SSL handshake
        self._protocol_connected = False

self._server_hostname = server_hostname
        self._waiter = waiter
        self._sslcontext = sslcontext
        self._paused = False

# SSL-specific extra info.  (peercert is set later)
        self._extra.update(sslcontext=sslcontext)

if self._loop.get_debug():
            logger.debug("%r starts SSL handshake", self)
            start_time = self._loop.time()
        else:
            start_time = None
        self._on_handshake(start_time)

def _wakeup_waiter(self, exc=None):
        if self._waiter is None:
            return
        if not self._waiter.cancelled():
            if exc is not None:
                self._waiter.set_exception(exc)
            else:
                self._waiter.set_result(None)
        self._waiter = None

def _on_handshake(self, start_time):
        try:
            self._sock.do_handshake()
        except ssl.SSLWantReadError:
            self._loop._add_reader(self._sock_fd,
                                   self._on_handshake, start_time)
            return
        except ssl.SSLWantWriteError:
            self._loop._add_writer(self._sock_fd,
                                   self._on_handshake, start_time)
            return
        except BaseException as exc:
            if self._loop.get_debug():
                logger.warning("%r: SSL handshake failed",
                               self, exc_info=True)
            self._loop._remove_reader(self._sock_fd)
            self._loop._remove_writer(self._sock_fd)
            self._sock.close()
            self._wakeup_waiter(exc)
            if isinstance(exc, Exception):
                return
            else:
                raise

self._loop._remove_reader(self._sock_fd)
        self._loop._remove_writer(self._sock_fd)

peercert = self._sock.getpeercert()
        if not hasattr(self._sslcontext, 'check_hostname'):
            # Verify hostname if requested, Python 3.4+ uses check_hostname
            # and checks the hostname in do_handshake()
            if (self._server_hostname and
                self._sslcontext.verify_mode != ssl.CERT_NONE):
                try:
                    ssl.match_hostname(peercert, self._server_hostname)
                except Exception as exc:
                    if self._loop.get_debug():
                        logger.warning("%r: SSL handshake failed "
                                       "on matching the hostname",
                                       self, exc_info=True)
                    self._sock.close()
                    self._wakeup_waiter(exc)
                    return

# Add extra info that becomes available after handshake.
        self._extra.update(peercert=peercert,
                           cipher=self._sock.cipher(),
                           compression=self._sock.compression(),
                           ssl_object=self._sock,
                           )

self._read_wants_write = False
        self._write_wants_read = False
        self._loop._add_reader(self._sock_fd, self._read_ready)
        self._protocol_connected = True
        self._loop.call_soon(self._protocol.connection_made, self)
        # only wake up the waiter when connection_made() has been called
        self._loop.call_soon(self._wakeup_waiter)

if self._loop.get_debug():
            dt = self._loop.time() - start_time
            logger.debug("%r: SSL handshake took %.1f ms", self, dt * 1e3)

def pause_reading(self):
        # XXX This is a bit icky, given the comment at the top of
        # _read_ready().  Is it possible to evoke a deadlock?  I don't
        # know, although it doesn't look like it; write() will still
        # accept more data for the buffer and eventually the app will
        # call resume_reading() again, and things will flow again.

if self._closing:
            raise RuntimeError('Cannot pause_reading() when closing')
        if self._paused:
            raise RuntimeError('Already paused')
        self._paused = True
        self._loop._remove_reader(self._sock_fd)
        if self._loop.get_debug():
            logger.debug("%r pauses reading", self)

def _read_ready(self):
        if self._conn_lost:
            return
        if self._write_wants_read:
            self._write_wants_read = False
            self._write_ready()

if self._buffer:
                self._loop._add_writer(self._sock_fd, self._write_ready)

try:
            data = self._sock.recv(self.max_size)
        except (BlockingIOError, InterruptedError, ssl.SSLWantReadError):
            pass
        except ssl.SSLWantWriteError:
            self._read_wants_write = True
            self._loop._remove_reader(self._sock_fd)
            self._loop._add_writer(self._sock_fd, self._write_ready)
        except Exception as exc:
            self._fatal_error(exc, 'Fatal read error on SSL transport')
        else:
            if data:
                self._protocol.data_received(data)
            else:
                try:
                    if self._loop.get_debug():
                        logger.debug("%r received EOF", self)
                    keep_open = self._protocol.eof_received()
                    if keep_open:
                        logger.warning('returning true from eof_received() '
                                       'has no effect when using ssl')
                finally:
                    self.close()

def _write_ready(self):
        if self._conn_lost:
            return
        if self._read_wants_write:
            self._read_wants_write = False
            self._read_ready()

if not (self._paused or self._closing):
                self._loop._add_reader(self._sock_fd, self._read_ready)

if self._buffer:
            try:
                n = self._sock.send(self._buffer)
            except (BlockingIOError, InterruptedError, ssl.SSLWantWriteError):
                n = 0
            except ssl.SSLWantReadError:
                n = 0
                self._loop._remove_writer(self._sock_fd)
                self._write_wants_read = True
            except Exception as exc:
                self._loop._remove_writer(self._sock_fd)
                self._buffer.clear()
                self._fatal_error(exc, 'Fatal write error on SSL transport')
                return

if n:
                del self._buffer[:n]

self._maybe_resume_protocol()  # May append to buffer.

if not self._buffer:
            self._loop._remove_writer(self._sock_fd)
            if self._closing:
                self._call_connection_lost(None)

if not self._buffer:
            self._loop._add_writer(self._sock_fd, self._write_ready)

# Add it to the buffer.
        self._buffer.extend(data)
        self._maybe_pause_protocol()

def can_write_eof(self):
        return False

class _SelectorDatagramTransport(_SelectorTransport):

_buffer_factory = collections.deque

def __init__(self, loop, sock, protocol, address=None,
                 waiter=None, extra=None):
        super().__init__(loop, sock, protocol, extra)
        self._address = address
        self._loop.call_soon(self._protocol.connection_made, self)
        # only start reading when connection_made() has been called
        self._loop.call_soon(self._loop._add_reader,
                             self._sock_fd, self._read_ready)
        if waiter is not None:
            # only wake up the waiter when connection_made() has been called
            self._loop.call_soon(futures._set_result_unless_cancelled,
                                 waiter, None)

def get_write_buffer_size(self):
        return sum(len(data) for data, _ in self._buffer)

def _read_ready(self):
        if self._conn_lost:
            return
        try:
            data, addr = self._sock.recvfrom(self.max_size)
        except (BlockingIOError, InterruptedError):
            pass
        except OSError as exc:
            self._protocol.error_received(exc)
        except Exception as exc:
            self._fatal_error(exc, 'Fatal read error on datagram transport')
        else:
            self._protocol.datagram_received(data, addr)

def sendto(self, data, addr=None):
        if not isinstance(data, (bytes, bytearray, memoryview)):
            raise TypeError('data argument must be a bytes-like object, '
                            'not %r' % type(data).__name__)
        if not data:
            return

if self._address and addr not in (None, self._address):
            raise ValueError('Invalid address: must be None or %s' %
                             (self._address,))

if self._conn_lost and self._address:
            if self._conn_lost >= constants.LOG_THRESHOLD_FOR_CONNLOST_WRITES:
                logger.warning('socket.send() raised exception.')
            self._conn_lost += 1
            return

if not self._buffer:
            # Attempt to send it right away first.
            try:
                if self._address:
                    self._sock.send(data)
                else:
                    self._sock.sendto(data, addr)
                return
            except (BlockingIOError, InterruptedError):
                self._loop._add_writer(self._sock_fd, self._sendto_ready)
            except OSError as exc:
                self._protocol.error_received(exc)
                return
            except Exception as exc:
                self._fatal_error(exc,
                                  'Fatal write error on datagram transport')
                return

# Ensure that what we buffer is immutable.
        self._buffer.append((bytes(data), addr))
        self._maybe_pause_protocol()

def _sendto_ready(self):
        while self._buffer:
            data, addr = self._buffer.popleft()
            try:
                if self._address:
                    self._sock.send(data)
                else:
                    self._sock.sendto(data, addr)
            except (BlockingIOError, InterruptedError):
                self._buffer.appendleft((data, addr))  # Try again later.
                break
            except OSError as exc:
                self._protocol.error_received(exc)
                return
            except Exception as exc:
                self._fatal_error(exc,
                                  'Fatal write error on datagram transport')
                return

self._maybe_resume_protocol()  # May append to buffer.
        if not self._buffer:
            self._loop._remove_writer(self._sock_fd)
            if self._closing:
                self._call_connection_lost(None)

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__pycache__	DIR	13.08.2024 05:14:21	0/993	drwxr-xr-x	Edit Rename
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proactor_events.py	19.66 KB	31.05.2024 13:50:40	0/993	-rw-r--r--	Edit Rename Download
protocols.py	4.41 KB	31.05.2024 13:50:40	0/993	-rw-r--r--	Edit Rename Download
queues.py	7.64 KB	31.05.2024 13:50:40	0/993	-rw-r--r--	Edit Rename Download
selector_events.py	40.91 KB	31.05.2024 13:50:40	0/993	-rw-r--r--	Edit Rename Download
sslproto.py	25.34 KB	31.05.2024 13:50:40	0/993	-rw-r--r--	Edit Rename Download
streams.py	23.73 KB	31.05.2024 13:50:40	0/993	-rw-r--r--	Edit Rename Download
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tasks.py	25.93 KB	31.05.2024 13:50:40	0/993	-rw-r--r--	Edit Rename Download
test_utils.py	14.19 KB	31.05.2024 13:50:40	0/993	-rw-r--r--	Edit Rename Download
transports.py	9.83 KB	31.05.2024 13:50:40	0/993	-rw-r--r--	Edit Rename Download
unix_events.py	35.89 KB	31.05.2024 13:50:40	0/993	-rw-r--r--	Edit Rename Download
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