track embedded python distribution

python/gevent/socket.py

@@ -0,0 +1,106 @@
+# Copyright (c) 2009-2014 Denis Bilenko and gevent contributors. See LICENSE for details.
+
+"""Cooperative low-level networking interface.
+
+This module provides socket operations and some related functions.
+The API of the functions and classes matches the API of the corresponding
+items in the standard :mod:`socket` module exactly, but the synchronous functions
+in this module only block the current greenlet and let the others run.
+
+For convenience, exceptions (like :class:`error <socket.error>` and :class:`timeout <socket.timeout>`)
+as well as the constants from the :mod:`socket` module are imported into this module.
+"""
+# Our import magic sadly makes this warning useless
+# pylint: disable=undefined-variable
+
+import sys
+from gevent._compat import PY3
+from gevent._util import copy_globals
+
+
+if PY3:
+    from gevent import _socket3 as _source # python 2: pylint:disable=no-name-in-module
+else:
+    from gevent import _socket2 as _source
+
+# define some things we're expecting to overwrite; each module
+# needs to define these
+__implements__ = __dns__ = __all__ = __extensions__ = __imports__ = ()
+
+
+class error(Exception):
+    errno = None
+
+
+def getfqdn(*args):
+    # pylint:disable=unused-argument
+    raise NotImplementedError()
+
+copy_globals(_source, globals(),
+             dunder_names_to_keep=('__implements__', '__dns__', '__all__',
+                                   '__extensions__', '__imports__', '__socket__'),
+             cleanup_globs=False)
+
+# The _socket2 and _socket3 don't import things defined in
+# __extensions__, to help avoid confusing reference cycles in the
+# documentation and to prevent importing from the wrong place, but we
+# *do* need to expose them here. (NOTE: This may lead to some sphinx
+# warnings like:
+#    WARNING: missing attribute mentioned in :members: or __all__:
+#             module gevent._socket2, attribute cancel_wait
+# These can be ignored.)
+from gevent import _socketcommon
+copy_globals(_socketcommon, globals(),
+             only_names=_socketcommon.__extensions__)
+
+try:
+    _GLOBAL_DEFAULT_TIMEOUT = __socket__._GLOBAL_DEFAULT_TIMEOUT
+except AttributeError:
+    _GLOBAL_DEFAULT_TIMEOUT = object()
+
+
+def create_connection(address, timeout=_GLOBAL_DEFAULT_TIMEOUT, source_address=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.
+    A host of '' or port 0 tells the OS to use the default.
+    """
+
+    host, port = address
+    err = None
+    for res in getaddrinfo(host, port, 0 if has_ipv6 else AF_INET, SOCK_STREAM):
+        af, socktype, proto, _, sa = res
+        sock = None
+        try:
+            sock = socket(af, socktype, proto)
+            if timeout is not _GLOBAL_DEFAULT_TIMEOUT:
+                sock.settimeout(timeout)
+            if source_address:
+                sock.bind(source_address)
+            sock.connect(sa)
+            return sock
+        except error as ex:
+            # without exc_clear(), if connect() fails once, the socket is referenced by the frame in exc_info
+            # and the next bind() fails (see test__socket.TestCreateConnection)
+            # that does not happen with regular sockets though, because _socket.socket.connect() is a built-in.
+            # this is similar to "getnameinfo loses a reference" failure in test_socket.py
+            if not PY3:
+                sys.exc_clear() # pylint:disable=no-member,useless-suppression
+            if sock is not None:
+                sock.close()
+            err = ex
+    if err is not None:
+        raise err # pylint:disable=raising-bad-type
+    else:
+        raise error("getaddrinfo returns an empty list")
+
+# This is promised to be in the __all__ of the _source, but, for circularity reasons,
+# we implement it in this module. Mostly for documentation purposes, put it
+# in the _source too.
+_source.create_connection = create_connection