feat: fixes exception due to unread bytes in stream (#1897)

* feat: fixes exception due to unread bytes in stream

* feat: additonal unit tests to cover changes

* fix: automated changes by `make fix-import`

* fix: additonal changes by `make fix-import`

Co-authored-by: Adam Hopkins <admhpkns@gmail.com>

sanic/response.py

@@ -42,7 +42,7 @@ class BaseHTTPResponse:
         body=b"",
     ):
         """.. deprecated:: 20.3:
-           This function is not public API and will be removed."""
+        This function is not public API and will be removed."""
 
         # self.headers get priority over content_type
         if self.content_type and "Content-Type" not in self.headers:
@@ -249,7 +249,10 @@ def raw(
     :param content_type: the content type (string) of the response.
     """
     return HTTPResponse(
-        body=body, status=status, headers=headers, content_type=content_type,
+        body=body,
+        status=status,
+        headers=headers,
+        content_type=content_type,
     )
 
 

sanic/router.py

@@ -452,7 +452,7 @@ class Router:
         return route_handler, [], kwargs, route.uri, route.name
 
     def is_stream_handler(self, request):
-        """ Handler for request is stream or not.
+        """Handler for request is stream or not.
         :param request: Request object
         :return: bool
         """

sanic/server.py

@@ -418,12 +418,13 @@ class HttpProtocol(asyncio.Protocol):
     async def stream_append(self):
         while self._body_chunks:
             body = self._body_chunks.popleft()
-            if self.request.stream.is_full():
-                self.transport.pause_reading()
-                await self.request.stream.put(body)
-                self.transport.resume_reading()
-            else:
-                await self.request.stream.put(body)
+            if self.request:
+                if self.request.stream.is_full():
+                    self.transport.pause_reading()
+                    await self.request.stream.put(body)
+                    self.transport.resume_reading()
+                else:
+                    await self.request.stream.put(body)
 
     def on_message_complete(self):
         # Entire request (headers and whole body) is received.

sanic/testing.py

@@ -103,7 +103,9 @@ class SanicTestClient:
 
         if self.port:
             server_kwargs = dict(
-                host=host or self.host, port=self.port, **server_kwargs,
+                host=host or self.host,
+                port=self.port,
+                **server_kwargs,
             )
             host, port = host or self.host, self.port
         else:

sanic/worker.py

@@ -174,7 +174,7 @@ class GunicornWorker(base.Worker):
 
     @staticmethod
     def _create_ssl_context(cfg):
-        """ Creates SSLContext instance for usage in asyncio.create_server.
+        """Creates SSLContext instance for usage in asyncio.create_server.
         See ssl.SSLSocket.__init__ for more details.
         """
         ctx = ssl.SSLContext(cfg.ssl_version)

tests/test_keep_alive_timeout.py

@@ -244,8 +244,8 @@ async def handler3(request):
 
 def test_keep_alive_timeout_reuse():
     """If the server keep-alive timeout and client keep-alive timeout are
-     both longer than the delay, the client _and_ server will successfully
-     reuse the existing connection."""
+    both longer than the delay, the client _and_ server will successfully
+    reuse the existing connection."""
     try:
         loop = asyncio.new_event_loop()
         asyncio.set_event_loop(loop)

tests/test_request_data.py

@@ -46,8 +46,8 @@ def test_custom_context(app):
             invalid = str(e)
 
         j = loads(response.body)
-        j['response_mw_valid'] = user
-        j['response_mw_invalid'] = invalid
+        j["response_mw_valid"] = user
+        j["response_mw_invalid"] = invalid
         return json(j)
 
     request, response = app.test_client.get("/")
@@ -59,8 +59,7 @@ def test_custom_context(app):
         "has_missing": False,
         "invalid": "'types.SimpleNamespace' object has no attribute 'missing'",
         "response_mw_valid": "sanic",
-        "response_mw_invalid":
-            "'types.SimpleNamespace' object has no attribute 'missing'"
+        "response_mw_invalid": "'types.SimpleNamespace' object has no attribute 'missing'",
     }
 
 

tests/test_request_stream.py

@@ -1,4 +1,5 @@
 import pytest
+import asyncio
 
 from sanic.blueprints import Blueprint
 from sanic.exceptions import HeaderExpectationFailed
@@ -6,6 +7,7 @@ from sanic.request import StreamBuffer
 from sanic.response import json, stream, text
 from sanic.views import CompositionView, HTTPMethodView
 from sanic.views import stream as stream_decorator
+from sanic.server import HttpProtocol
 
 
 data = "abc" * 1_000_000
@@ -337,6 +339,22 @@ def test_request_stream_handle_exception(app):
     assert "Method GET not allowed for URL /post/random_id" in response.text
 
 
+@pytest.mark.asyncio
+async def test_request_stream_unread(app):
+    """ensure no error is raised when leaving unread bytes in byte-buffer"""
+
+    err = None
+    protocol = HttpProtocol(loop=asyncio.get_event_loop(), app=app)
+    try:
+        protocol.request = None
+        protocol._body_chunks.append("this is a test")
+        await protocol.stream_append()
+    except AttributeError as e:
+        err = e
+
+    assert err is None and not protocol._body_chunks
+
+
 def test_request_stream_blueprint(app):
     """for self.is_request_stream = True"""
     bp = Blueprint("test_blueprint_request_stream_blueprint")