Fix bug in FileResponse when compression wouldn't work (aio-libs#2944)

Closes aio-libs#2942

CHANGES/2942.bugfix

@@ -0,0 +1 @@
+Fix compression of FileResponse

aiohttp/web_fileresponse.py

@@ -107,7 +107,8 @@ async def _sendfile_system(self, request, fobj, count):
 
         transport = request.transport
         if (transport.get_extra_info("sslcontext") or
-                transport.get_extra_info("socket") is None):
+                transport.get_extra_info("socket") is None or
+                self.compression):
             writer = await self._sendfile_fallback(request, fobj, count)
         else:
             writer = SendfileStreamWriter(
@@ -131,7 +132,7 @@ async def _sendfile_fallback(self, request, fobj, count):
         # fobj is transferred in chunks controlled by the
         # constructor's chunk_size argument.
 
-        writer = (await super().prepare(request))
+        writer = await super().prepare(request)
 
         chunk_size = self._chunk_size
 

aiohttp/web_response.py

@@ -43,7 +43,7 @@ def __init__(self, *, status=200, reason=None, headers=None):
         self._keep_alive = None
         self._chunked = False
         self._compression = False
-        self._compression_force = False
+        self._compression_force = None
         self._cookies = SimpleCookie()
 
         self._req = None

tests/test_web_sendfile_functional.py

@@ -1,6 +1,7 @@
 import asyncio
 import os
 import pathlib
+import zlib
 
 import pytest
 
@@ -729,3 +730,25 @@ async def handler(request):
     resp = await client.get('/', headers={'If-Range': lastmod})
     assert 200 == resp.status
     resp.close()
+
+
+async def test_static_file_compression(aiohttp_client, sender):
+    filepath = pathlib.Path(__file__).parent / 'data.unknown_mime_type'
+
+    async def handler(request):
+        ret = sender(filepath)
+        ret.enable_compression()
+        return ret
+
+    app = web.Application()
+    app.router.add_get('/', handler)
+    client = await aiohttp_client(app, auto_decompress=False)
+
+    resp = await client.get('/')
+    assert resp.status == 200
+    zcomp = zlib.compressobj(wbits=-zlib.MAX_WBITS)
+    expected_body = zcomp.compress(b'file content\n') + zcomp.flush()
+    assert expected_body == await resp.read()
+    assert 'application/octet-stream' == resp.headers['Content-Type']
+    assert resp.headers.get('Content-Encoding') == 'deflate'
+    await resp.release()