Fix FileResponse fallback code

In case the FileResponse is using _sendfile_fallback and the requested range is smaller then the chunk size, we need to only read and send count bytes.
aio-libs · Apr 29, 2022 · b325660 · b325660
1 parent 0215cdd
commit b325660
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diff --git a/CHANGES/tba.bugfix b/CHANGES/tba.bugfix
@@ -0,0 +1 @@
+Fixed a bug in ``FileResponses`` fallback code when the requested range is smaller than the chunk size.
diff --git a/aiohttp/web_fileresponse.py b/aiohttp/web_fileresponse.py
@@ -72,7 +72,7 @@ async def _sendfile_fallback(
 
         await loop.run_in_executor(None, fobj.seek, offset)
 
-        chunk = await loop.run_in_executor(None, fobj.read, chunk_size)
+        chunk = await loop.run_in_executor(None, fobj.read, min(chunk_size, count))
         while chunk:
             await writer.write(chunk)
             count = count - chunk_size
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		Fixed a bug in ``FileResponses`` fallback code when the requested range is smaller than the chunk size.