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[PULL,10/32] python/aqmp: add configurable read buffer limit

Message ID 20210927192513.744199-11-jsnow@redhat.com (mailing list archive)
State New, archived
Headers show
Series [PULL,01/32] python/aqmp: add asynchronous QMP (AQMP) subpackage | expand

Commit Message

John Snow Sept. 27, 2021, 7:24 p.m. UTC 
QMP can transmit some pretty big messages, and the default limit of 64KB
isn't sufficient. Make sure that we can configure it.

Reported-by: G S Niteesh Babu <niteesh.gs@gmail.com>
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 20210915162955.333025-11-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
---
 python/qemu/aqmp/protocol.py | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)
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Patch

diff --git a/python/qemu/aqmp/protocol.py b/python/qemu/aqmp/protocol.py
index 62c26ede5a4..2ef19e96932 100644
--- a/python/qemu/aqmp/protocol.py
+++ b/python/qemu/aqmp/protocol.py
@@ -189,6 +189,9 @@  class AsyncProtocol(Generic[T]):
     #: Logger object for debugging messages from this connection.
     logger = logging.getLogger(__name__)
 
+    # Maximum allowable size of read buffer
+    _limit = (64 * 1024)
+
     # -------------------------
     # Section: Public interface
     # -------------------------
@@ -452,6 +455,7 @@  async def _client_connected_cb(reader: asyncio.StreamReader,
                 port=address[1],
                 ssl=ssl,
                 backlog=1,
+                limit=self._limit,
             )
         else:
             coro = asyncio.start_unix_server(
@@ -459,6 +463,7 @@  async def _client_connected_cb(reader: asyncio.StreamReader,
                 path=address,
                 ssl=ssl,
                 backlog=1,
+                limit=self._limit,
             )
 
         server = await coro     # Starts listening
@@ -482,9 +487,18 @@  async def _do_connect(self, address: Union[str, Tuple[str, int]],
         self.logger.debug("Connecting to %s ...", address)
 
         if isinstance(address, tuple):
-            connect = asyncio.open_connection(address[0], address[1], ssl=ssl)
+            connect = asyncio.open_connection(
+                address[0],
+                address[1],
+                ssl=ssl,
+                limit=self._limit,
+            )
         else:
-            connect = asyncio.open_unix_connection(path=address, ssl=ssl)
+            connect = asyncio.open_unix_connection(
+                path=address,
+                ssl=ssl,
+                limit=self._limit,
+            )
         self._reader, self._writer = await connect
 
         self.logger.debug("Connected.")