98 lines
3.2 KiB
Python
98 lines
3.2 KiB
Python
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import socket
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try:
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from select import poll, POLLIN
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except ImportError: # `poll` doesn't exist on OSX and other platforms
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poll = False
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try:
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from select import select
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except ImportError: # `select` doesn't exist on AppEngine.
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select = False
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def is_connection_dropped(conn): # Platform-specific
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"""
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Returns True if the connection is dropped and should be closed.
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:param conn:
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:class:`httplib.HTTPConnection` object.
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Note: For platforms like AppEngine, this will always return ``False`` to
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let the platform handle connection recycling transparently for us.
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"""
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sock = getattr(conn, 'sock', False)
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if sock is False: # Platform-specific: AppEngine
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return False
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if sock is None: # Connection already closed (such as by httplib).
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return True
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if not poll:
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if not select: # Platform-specific: AppEngine
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return False
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try:
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return select([sock], [], [], 0.0)[0]
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except socket.error:
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return True
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# This version is better on platforms that support it.
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p = poll()
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p.register(sock, POLLIN)
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for (fno, ev) in p.poll(0.0):
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if fno == sock.fileno():
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# Either data is buffered (bad), or the connection is dropped.
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return True
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# This function is copied from socket.py in the Python 2.7 standard
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# library test suite. Added to its signature is only `socket_options`.
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def create_connection(address, timeout=socket._GLOBAL_DEFAULT_TIMEOUT,
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source_address=None, socket_options=None):
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"""Connect to *address* and return the socket object.
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Convenience function. Connect to *address* (a 2-tuple ``(host,
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port)``) and return the socket object. Passing the optional
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*timeout* parameter will set the timeout on the socket instance
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before attempting to connect. If no *timeout* is supplied, the
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global default timeout setting returned by :func:`getdefaulttimeout`
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is used. If *source_address* is set it must be a tuple of (host, port)
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for the socket to bind as a source address before making the connection.
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An host of '' or port 0 tells the OS to use the default.
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"""
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host, port = address
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err = None
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for res in socket.getaddrinfo(host, port, 0, socket.SOCK_STREAM):
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af, socktype, proto, canonname, sa = res
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sock = None
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try:
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sock = socket.socket(af, socktype, proto)
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# If provided, set socket level options before connecting.
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# This is the only addition urllib3 makes to this function.
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_set_socket_options(sock, socket_options)
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if timeout is not socket._GLOBAL_DEFAULT_TIMEOUT:
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sock.settimeout(timeout)
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if source_address:
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sock.bind(source_address)
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sock.connect(sa)
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return sock
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except socket.error as _:
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err = _
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if sock is not None:
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sock.close()
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if err is not None:
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raise err
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else:
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raise socket.error("getaddrinfo returns an empty list")
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def _set_socket_options(sock, options):
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if options is None:
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return
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for opt in options:
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sock.setsockopt(*opt)
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