117 lines
4.3 KiB
Python
117 lines
4.3 KiB
Python
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# -*- coding: utf-8 -*-
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"""
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hyper/httplib_compat
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~~~~~~~~~~~~~~~~~~~~
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This file defines the publicly-accessible API for hyper. This API also
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constitutes the abstraction layer between HTTP/1.1 and HTTP/2.
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This API doesn't currently work, and is a lower priority than the HTTP/2
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stack at this time.
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"""
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import socket
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try:
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import http.client as httplib
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except ImportError:
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import httplib
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from .compat import ssl
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from .http20.tls import wrap_socket
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# If there's no NPN support, we're going to drop all support for HTTP/2.
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try:
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support_20 = ssl.HAS_NPN
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except AttributeError:
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support_20 = False
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# The HTTPConnection object is currently always the underlying one.
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HTTPConnection = httplib.HTTPConnection
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HTTPSConnection = httplib.HTTPSConnection
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# If we have NPN support, define our custom one, otherwise just use the
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# default.
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if support_20:
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class HTTPSConnection(object):
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"""
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An object representing a single HTTPS connection, whether HTTP/1.1 or
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HTTP/2.
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More specifically, this object represents an abstraction over the
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distinction. This object encapsulates a connection object for one of
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the specific types of connection, and delegates most of the work to
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that object.
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"""
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def __init__(self, *args, **kwargs):
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# Whatever arguments and keyword arguments are passed to this
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# object need to be saved off for when we initialise one of our
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# subsidiary objects.
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self._original_args = args
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self._original_kwargs = kwargs
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# Set up some variables we're going to use later.
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self._sock = None
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self._conn = None
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# Prepare our backlog of method calls.
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self._call_queue = []
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def __getattr__(self, name):
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# Anything that can't be found on this instance is presumably a
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# property of underlying connection object.
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# We need to be a little bit careful here. There are a few methods
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# that can act on a HTTPSConnection before it actually connects to
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# the remote server. We don't want to change the semantics of the,
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# HTTPSConnection so we need to spot these and queue them up. When
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# we actually create the backing Connection, we'll apply them
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# immediately. These methods can't throw exceptions, so we should
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# be fine.
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delay_methods = ["set_tunnel", "set_debuglevel"]
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if self._conn is None and name in delay_methods:
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# Return a little closure that saves off the method call to
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# apply later.
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def capture(obj, *args, **kwargs):
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self._call_queue.append((name, args, kwargs))
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return capture
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elif self._conn is None:
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# We're being told to do something! We can now connect to the
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# remote server and build the connection object.
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self._delayed_connect()
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# Call through to the underlying object.
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return getattr(self._conn, name)
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def _delayed_connect(self):
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"""
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Called when we need to work out what kind of HTTPS connection we're
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actually going to use.
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"""
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# Because we're ghetto, we're going to quickly create a
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# HTTPConnection object to parse the args and kwargs for us, and
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# grab the values out.
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tempconn = httplib.HTTPConnection(*self._original_args,
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**self._original_kwargs)
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host = tempconn.host
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port = tempconn.port
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timeout = tempconn.timeout
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source_address = tempconn.source_address
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# Connect to the remote server.
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sock = socket.create_connection(
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(host, port),
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timeout,
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source_address
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)
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# Wrap it in TLS. This needs to be looked at in future when I pull
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# in the TLS verification logic from urllib3, but right now we
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# accept insecurity because no-one's using this anyway.
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sock = wrap_socket(sock, host)
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# At this early stage the library can't do HTTP/2, so who cares?
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tempconn.sock = sock
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self._sock = sock
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self._conn = tempconn
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return
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