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Edit File : connection.py \| Size : 4.14 KB
from __future__ import absolute_import import socket from .wait import wait_for_read from .selectors import HAS_SELECT, SelectorError def is_connection_dropped(conn): # Platform-specific """ Returns True if the connection is dropped and should be closed. :param conn: :class:`httplib.HTTPConnection` object. Note: For platforms like AppEngine, this will always return ``False`` to let the platform handle connection recycling transparently for us. """ sock = getattr(conn, 'sock', False) if sock is False: # Platform-specific: AppEngine return False if sock is None: # Connection already closed (such as by httplib). return True if not HAS_SELECT: return False try: return bool(wait_for_read(sock, timeout=0.0)) except SelectorError: return True # This function is copied from socket.py in the Python 2.7 standard # library test suite. Added to its signature is only `socket_options`. # One additional modification is that we avoid binding to IPv6 servers # discovered in DNS if the system doesn't have IPv6 functionality. def create_connection(address, timeout=socket._GLOBAL_DEFAULT_TIMEOUT, source_address=None, socket_options=None): """Connect to address and return the socket object. Convenience function. Connect to address (a 2-tuple ``(host, port)``) and return the socket object. Passing the optional timeout parameter will set the timeout on the socket instance before attempting to connect. If no timeout is supplied, the global default timeout setting returned by :func:`getdefaulttimeout` is used. If source_address is set it must be a tuple of (host, port) for the socket to bind as a source address before making the connection. An host of '' or port 0 tells the OS to use the default. """ host, port = address if host.startswith('['): host = host.strip('[]') err = None # Using the value from allowed_gai_family() in the context of getaddrinfo lets # us select whether to work with IPv4 DNS records, IPv6 records, or both. # The original create_connection function always returns all records. family = allowed_gai_family() for res in socket.getaddrinfo(host, port, family, socket.SOCK_STREAM): af, socktype, proto, canonname, sa = res sock = None try: sock = socket.socket(af, socktype, proto) # If provided, set socket level options before connecting. _set_socket_options(sock, socket_options) if timeout is not socket._GLOBAL_DEFAULT_TIMEOUT: sock.settimeout(timeout) if source_address: sock.bind(source_address) sock.connect(sa) return sock except socket.error as e: err = e if sock is not None: sock.close() sock = None if err is not None: raise err raise socket.error("getaddrinfo returns an empty list") def _set_socket_options(sock, options): if options is None: return for opt in options: sock.setsockopt(*opt) def allowed_gai_family(): """This function is designed to work in the context of getaddrinfo, where family=socket.AF_UNSPEC is the default and will perform a DNS search for both IPv6 and IPv4 records.""" family = socket.AF_INET if HAS_IPV6: family = socket.AF_UNSPEC return family def _has_ipv6(host): """ Returns True if the system can bind an IPv6 address. """ sock = None has_ipv6 = False if socket.has_ipv6: # has_ipv6 returns true if cPython was compiled with IPv6 support. # It does not tell us if the system has IPv6 support enabled. To # determine that we must bind to an IPv6 address. # https://github.com/shazow/urllib3/pull/611 # https://bugs.python.org/issue658327 try: sock = socket.socket(socket.AF_INET6) sock.bind((host, 0)) has_ipv6 = True except Exception: pass if sock: sock.close() return has_ipv6 HAS_IPV6 = _has_ipv6('::1') Back

Edit File : connection.py | Size : 4.14 KB

from __future__ import absolute_import
import socket
from .wait import wait_for_read
from .selectors import HAS_SELECT, SelectorError

def is_connection_dropped(conn):  # Platform-specific
    """
    Returns True if the connection is dropped and should be closed.

:param conn:
        :class:`httplib.HTTPConnection` object.

Note: For platforms like AppEngine, this will always return ``False`` to
    let the platform handle connection recycling transparently for us.
    """
    sock = getattr(conn, 'sock', False)
    if sock is False:  # Platform-specific: AppEngine
        return False
    if sock is None:  # Connection already closed (such as by httplib).
        return True

if not HAS_SELECT:
        return False

try:
        return bool(wait_for_read(sock, timeout=0.0))
    except SelectorError:
        return True

# This function is copied from socket.py in the Python 2.7 standard
# library test suite. Added to its signature is only `socket_options`.
# One additional modification is that we avoid binding to IPv6 servers
# discovered in DNS if the system doesn't have IPv6 functionality.
def create_connection(address, timeout=socket._GLOBAL_DEFAULT_TIMEOUT,
                      source_address=None, socket_options=None):
    """Connect to *address* and return the socket object.

Convenience function.  Connect to *address* (a 2-tuple ``(host,
    port)``) and return the socket object.  Passing the optional
    *timeout* parameter will set the timeout on the socket instance
    before attempting to connect.  If no *timeout* is supplied, the
    global default timeout setting returned by :func:`getdefaulttimeout`
    is used.  If *source_address* is set it must be a tuple of (host, port)
    for the socket to bind as a source address before making the connection.
    An host of '' or port 0 tells the OS to use the default.
    """

host, port = address
    if host.startswith('['):
        host = host.strip('[]')
    err = None

# Using the value from allowed_gai_family() in the context of getaddrinfo lets
    # us select whether to work with IPv4 DNS records, IPv6 records, or both.
    # The original create_connection function always returns all records.
    family = allowed_gai_family()

for res in socket.getaddrinfo(host, port, family, socket.SOCK_STREAM):
        af, socktype, proto, canonname, sa = res
        sock = None
        try:
            sock = socket.socket(af, socktype, proto)

# If provided, set socket level options before connecting.
            _set_socket_options(sock, socket_options)

if timeout is not socket._GLOBAL_DEFAULT_TIMEOUT:
                sock.settimeout(timeout)
            if source_address:
                sock.bind(source_address)
            sock.connect(sa)
            return sock

except socket.error as e:
            err = e
            if sock is not None:
                sock.close()
                sock = None

if err is not None:
        raise err

raise socket.error("getaddrinfo returns an empty list")

def _set_socket_options(sock, options):
    if options is None:
        return

for opt in options:
        sock.setsockopt(*opt)

def allowed_gai_family():
    """This function is designed to work in the context of
    getaddrinfo, where family=socket.AF_UNSPEC is the default and
    will perform a DNS search for both IPv6 and IPv4 records."""

family = socket.AF_INET
    if HAS_IPV6:
        family = socket.AF_UNSPEC
    return family

def _has_ipv6(host):
    """ Returns True if the system can bind an IPv6 address. """
    sock = None
    has_ipv6 = False

if socket.has_ipv6:
        # has_ipv6 returns true if cPython was compiled with IPv6 support.
        # It does not tell us if the system has IPv6 support enabled. To
        # determine that we must bind to an IPv6 address.
        # https://github.com/shazow/urllib3/pull/611
        # https://bugs.python.org/issue658327
        try:
            sock = socket.socket(socket.AF_INET6)
            sock.bind((host, 0))
            has_ipv6 = True
        except Exception:
            pass

if sock:
        sock.close()
    return has_ipv6

HAS_IPV6 = _has_ipv6('::1')

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