Add a more general fix for #127 (CPy #20007) based on #136.

Author: gsnedders

html5lib/inputstream.py

@@ -1,6 +1,7 @@
 from __future__ import absolute_import, division, unicode_literals
+
 from six import text_type
-from six.moves import http_client
+from six.moves import http_client, urllib
 
 import codecs
 import re
@@ -130,9 +131,12 @@ def _readFromBuffer(self, bytes):
 
 
 def HTMLInputStream(source, encoding=None, parseMeta=True, chardet=True):
-    if isinstance(source, http_client.HTTPResponse):
-        # Work around Python bug #20007: read(0) closes the connection.
-        # http://bugs.python.org/issue20007
+    # Work around Python bug #20007: read(0) closes the connection.
+    # http://bugs.python.org/issue20007
+    if (isinstance(source, http_client.HTTPResponse) or
+        # Also check for addinfourl wrapping HTTPResponse
+        (isinstance(source, urllib.response.addbase) and
+         isinstance(source.fp, http_client.HTTPResponse))):
         isUnicode = False
     elif hasattr(source, "read"):
         isUnicode = isinstance(source.read(0), text_type)

html5lib/tests/test_stream.py

@@ -4,8 +4,10 @@
 import unittest
 import codecs
 from io import BytesIO
+import socket
 
-from six.moves import http_client
+import six
+from six.moves import http_client, urllib
 
 from html5lib.inputstream import (BufferedStream, HTMLInputStream,
                                   HTMLUnicodeInputStream, HTMLBinaryInputStream)
@@ -170,6 +172,24 @@ def makefile(self, _mode, _bufsize=None):
         stream = HTMLInputStream(source)
         self.assertEqual(stream.charsUntil(" "), "Text")
 
+    def test_python_issue_20007_b(self):
+        """
+        Make sure we have a work-around for Python bug #20007
+        http://bugs.python.org/issue20007
+        """
+        if six.PY2:
+            return
+
+        class FakeSocket(object):
+            def makefile(self, _mode, _bufsize=None):
+                return BytesIO(b"HTTP/1.1 200 Ok\r\n\r\nText")
+
+        source = http_client.HTTPResponse(FakeSocket())
+        source.begin()
+        wrapped = urllib.response.addinfourl(source, source.msg, "http://example.com")
+        stream = HTMLInputStream(wrapped)
+        self.assertEqual(stream.charsUntil(" "), "Text")
+
 
 def buildTestSuite():
     return unittest.defaultTestLoader.loadTestsFromName(__name__)