Removed compatibility code for streaming responses.

This code provided a deprecation path for old-style streaming responses.

Refs #6527, #7581.

django/http/__init__.py

@@ -2,9 +2,9 @@ from django.http.cookie import SimpleCookie, parse_cookie
 from django.http.request import (HttpRequest, QueryDict, UnreadablePostError,
     build_request_repr)
 from django.http.response import (HttpResponse, StreamingHttpResponse,
-    CompatibleStreamingHttpResponse, HttpResponsePermanentRedirect,
-    HttpResponseRedirect, HttpResponseNotModified, HttpResponseBadRequest,
-    HttpResponseForbidden, HttpResponseNotFound, HttpResponseNotAllowed,
-    HttpResponseGone, HttpResponseServerError, Http404, BadHeaderError)
+    HttpResponseRedirect, HttpResponsePermanentRedirect,
+    HttpResponseNotModified, HttpResponseBadRequest, HttpResponseForbidden,
+    HttpResponseNotFound, HttpResponseNotAllowed, HttpResponseGone,
+    HttpResponseServerError, Http404, BadHeaderError)
 from django.http.utils import (fix_location_header, conditional_content_removal,
     fix_IE_for_attach, fix_IE_for_vary)

django/http/response.py

@@ -2,7 +2,6 @@ from __future__ import absolute_import, unicode_literals
 
 import datetime
 import time
-import warnings
 from email.header import Header
 try:
     from urllib.parse import urlparse
@@ -332,53 +331,27 @@ class HttpResponse(HttpResponseBase):
     else:
         __str__ = serialize
 
-    def _consume_content(self):
-        # If the response was instantiated with an iterator, when its content
-        # is accessed, the iterator is going be exhausted and the content
-        # loaded in memory. At this point, it's better to abandon the original
-        # iterator and save the content for later reuse. This is a temporary
-        # solution. See the comment in __iter__ below for the long term plan.
-        if self._base_content_is_iter:
-            self.content = b''.join(self.make_bytes(e) for e in self._container)
-
     @property
     def content(self):
-        self._consume_content()
         return b''.join(self.make_bytes(e) for e in self._container)
 
     @content.setter
     def content(self, value):
         if hasattr(value, '__iter__') and not isinstance(value, (bytes, six.string_types)):
-            self._container = value
-            self._base_content_is_iter = True
             if hasattr(value, 'close'):
                 self._closable_objects.append(value)
-        else:
+            value = b''.join(self.make_bytes(e) for e in value)
         self._container = [value]
-            self._base_content_is_iter = False
 
     def __iter__(self):
-        # Raise a deprecation warning only if the content wasn't consumed yet,
-        # because the response may be intended to be streamed.
-        # Once the deprecation completes, iterators should be consumed upon
-        # assignment rather than upon access. The _consume_content method
-        # should be removed. See #6527.
-        if self._base_content_is_iter:
-            warnings.warn(
-                'Creating streaming responses with `HttpResponse` is '
-                'deprecated. Use `StreamingHttpResponse` instead '
-                'if you need the streaming behavior.',
-                DeprecationWarning, stacklevel=2)
         if not hasattr(self, '_iterator'):
             self._iterator = iter(self._container)
         return self
 
     def write(self, content):
-        self._consume_content()
         self._container.append(content)
 
     def tell(self):
-        self._consume_content()
         return len(self.content)
 
 
@@ -416,35 +389,6 @@ class StreamingHttpResponse(HttpResponseBase):
             self._closable_objects.append(value)
 
 
-class CompatibleStreamingHttpResponse(StreamingHttpResponse):
-    """
-    This class maintains compatibility with middleware that doesn't know how
-    to handle the content of a streaming response by exposing a `content`
-    attribute that will consume and cache the content iterator when accessed.
-
-    These responses will stream only if no middleware attempts to access the
-    `content` attribute. Otherwise, they will behave like a regular response,
-    and raise a `DeprecationWarning`.
-    """
-    @property
-    def content(self):
-        warnings.warn(
-            'Accessing the `content` attribute on a streaming response is '
-            'deprecated. Use the `streaming_content` attribute instead.',
-            DeprecationWarning, stacklevel=2)
-        content = b''.join(self)
-        self.streaming_content = [content]
-        return content
-
-    @content.setter
-    def content(self, content):
-        warnings.warn(
-            'Accessing the `content` attribute on a streaming response is '
-            'deprecated. Use the `streaming_content` attribute instead.',
-            DeprecationWarning, stacklevel=2)
-        self.streaming_content = [content]
-
-
 class HttpResponseRedirectBase(HttpResponse):
     allowed_schemes = ['http', 'https', 'ftp']
 
@@ -478,7 +422,6 @@ class HttpResponseNotModified(HttpResponse):
         if value:
             raise AttributeError("You cannot set content to a 304 (Not Modified) response")
         self._container = []
-        self._base_content_is_iter = False
 
 
 class HttpResponseBadRequest(HttpResponse):

django/views/static.py

@@ -14,8 +14,8 @@ try:
 except ImportError:     # Python 2
     from urllib import unquote
 
-from django.http import (CompatibleStreamingHttpResponse, Http404,
-    HttpResponse, HttpResponseRedirect, HttpResponseNotModified)
+from django.http import (Http404, HttpResponse, HttpResponseRedirect,
+    HttpResponseNotModified, StreamingHttpResponse)
 from django.template import loader, Template, Context, TemplateDoesNotExist
 from django.utils.http import http_date, parse_http_date
 from django.utils.translation import ugettext as _, ugettext_noop
@@ -63,7 +63,7 @@ def serve(request, path, document_root=None, show_indexes=False):
         return HttpResponseNotModified()
     content_type, encoding = mimetypes.guess_type(fullpath)
     content_type = content_type or 'application/octet-stream'
-    response = CompatibleStreamingHttpResponse(open(fullpath, 'rb'),
+    response = StreamingHttpResponse(open(fullpath, 'rb'),
                                      content_type=content_type)
     response["Last-Modified"] = http_date(statobj.st_mtime)
     if stat.S_ISREG(statobj.st_mode):

tests/httpwrappers/tests.py

@@ -324,19 +324,10 @@ class HttpResponseTests(unittest.TestCase):
         r.content = [1, 2, 3]
         self.assertEqual(r.content, b'123')
 
-        #test retrieval explicitly using iter (deprecated) and odd inputs
+        #test odd inputs
         r = HttpResponse()
         r.content = ['1', '2', 3, '\u079e']
-        with warnings.catch_warnings(record=True) as w:
-            warnings.simplefilter("always", DeprecationWarning)
-            my_iter = iter(r)
-            self.assertEqual(w[0].category, DeprecationWarning)
-        with warnings.catch_warnings(record=True) as w:
-            warnings.simplefilter("always", DeprecationWarning)
-            result = list(my_iter)
-            self.assertEqual(w[0].category, DeprecationWarning)
         #'\xde\x9e' == unichr(1950).encode('utf-8')
-        self.assertEqual(result, [b'1', b'2', b'3', b'\xde\x9e'])
         self.assertEqual(r.content, b'123\xde\x9e')
 
         #with Content-Encoding header
@@ -344,9 +335,8 @@ class HttpResponseTests(unittest.TestCase):
         r['Content-Encoding'] = 'winning'
         r.content = [b'abc', b'def']
         self.assertEqual(r.content, b'abcdef')
-        r.content = ['\u079e']
         self.assertRaises(TypeError if six.PY3 else UnicodeEncodeError,
-                          getattr, r, 'content')
+                          setattr, r, 'content', ['\u079e'])
 
         # .content can safely be accessed multiple times.
         r = HttpResponse(iter(['hello', 'world']))
@@ -358,15 +348,12 @@ class HttpResponseTests(unittest.TestCase):
         # accessing .content still works
         self.assertEqual(r.content, b'helloworld')
 
-        # XXX accessing .content doesn't work if the response was iterated first
-        # XXX change this when the deprecation completes in HttpResponse
+        # Accessing .content also works if the response was iterated first.
         r = HttpResponse(iter(['hello', 'world']))
-        with warnings.catch_warnings():
-            warnings.simplefilter("ignore", DeprecationWarning)
         self.assertEqual(b''.join(r), b'helloworld')
-        self.assertEqual(r.content, b'')                # not the expected result!
+        self.assertEqual(r.content, b'helloworld')
 
-        # additional content can be written to the response.
+        # Additional content can be written to the response.
         r = HttpResponse(iter(['hello', 'world']))
         self.assertEqual(r.content, b'helloworld')
         r.write('!')