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[PATCH v3 11/25] python/aqmp: add _cb_inbound and _cb_outbound logging h
From: |
John Snow |
Subject: |
[PATCH v3 11/25] python/aqmp: add _cb_inbound and _cb_outbound logging hooks |
Date: |
Tue, 3 Aug 2021 14:29:27 -0400 |
Add hooks designed to log/filter incoming/outgoing messages. The primary
intent for these is to be able to support iotests which may want to log
messages with specific filters for reproducible output.
Another use is for plugging into Urwid frameworks; all messages in/out
can be automatically added to a rendering list for the purposes of a
qmp-shell like tool.
Signed-off-by: John Snow <jsnow@redhat.com>
---
python/qemu/aqmp/protocol.py | 50 +++++++++++++++++++++++++++++++++---
1 file changed, 46 insertions(+), 4 deletions(-)
diff --git a/python/qemu/aqmp/protocol.py b/python/qemu/aqmp/protocol.py
index 28f025928c0..86aede5d7af 100644
--- a/python/qemu/aqmp/protocol.py
+++ b/python/qemu/aqmp/protocol.py
@@ -177,6 +177,11 @@ class AsyncProtocol(Generic[T]):
can be written after the super() call.
- `_on_message`:
Actions to be performed when a message is received.
+ - `_cb_outbound`:
+ Logging/Filtering hook for all outbound messages.
+ - `_cb_inbound`:
+ Logging/Filtering hook for all inbound messages.
+ This hook runs *before* `_on_message()`.
:param name:
Name used for logging messages, if any. By default, messages
@@ -752,6 +757,43 @@ async def _bh_recv_message(self) -> None:
# Section: Message I/O
# --------------------
+ @upper_half
+ @bottom_half
+ def _cb_outbound(self, msg: T) -> T:
+ """
+ Callback: outbound message hook.
+
+ This is intended for subclasses to be able to add arbitrary
+ hooks to filter or manipulate outgoing messages. The base
+ implementation does nothing but log the message without any
+ manipulation of the message.
+
+ :param msg: raw outbound message
+ :return: final outbound message
+ """
+ self.logger.debug("--> %s", str(msg))
+ return msg
+
+ @upper_half
+ @bottom_half
+ def _cb_inbound(self, msg: T) -> T:
+ """
+ Callback: inbound message hook.
+
+ This is intended for subclasses to be able to add arbitrary
+ hooks to filter or manipulate incoming messages. The base
+ implementation does nothing but log the message without any
+ manipulation of the message.
+
+ This method does not "handle" incoming messages; it is a filter.
+ The actual "endpoint" for incoming messages is `_on_message()`.
+
+ :param msg: raw inbound message
+ :return: processed inbound message
+ """
+ self.logger.debug("<-- %s", str(msg))
+ return msg
+
@upper_half
@bottom_half
async def _do_recv(self) -> T:
@@ -780,8 +822,8 @@ async def _recv(self) -> T:
:return: A single (filtered, processed) protocol message.
"""
- # A forthcoming commit makes this method less trivial.
- return await self._do_recv()
+ message = await self._do_recv()
+ return self._cb_inbound(message)
@upper_half
@bottom_half
@@ -811,7 +853,7 @@ async def _send(self, msg: T) -> None:
:raise OSError: For problems with the underlying stream.
"""
- # A forthcoming commit makes this method less trivial.
+ msg = self._cb_outbound(msg)
self._do_send(msg)
@bottom_half
@@ -826,6 +868,6 @@ async def _on_message(self, msg: T) -> None:
directly cause the loop to halt, so logic may be best-kept
to a minimum if at all possible.
- :param msg: The incoming message
+ :param msg: The incoming message, already logged/filtered.
"""
# Nothing to do in the abstract case.
--
2.31.1
- [PATCH v3 02/25] python/aqmp: add error classes, (continued)
- [PATCH v3 02/25] python/aqmp: add error classes, John Snow, 2021/08/03
- [PATCH v3 03/25] python/pylint: Add exception for TypeVar names ('T'), John Snow, 2021/08/03
- [PATCH v3 07/25] python/aqmp: Add logging utility helpers, John Snow, 2021/08/03
- [PATCH v3 05/25] python/aqmp: add generic async message-based protocol support, John Snow, 2021/08/03
- [PATCH v3 06/25] python/aqmp: add runstate state machine to AsyncProtocol, John Snow, 2021/08/03
- [PATCH v3 08/25] python/aqmp: add logging to AsyncProtocol, John Snow, 2021/08/03
- [PATCH v3 11/25] python/aqmp: add _cb_inbound and _cb_outbound logging hooks,
John Snow <=
- [PATCH v3 04/25] python/aqmp: add asyncio compatibility wrappers, John Snow, 2021/08/03
- [PATCH v3 09/25] python/aqmp: add AsyncProtocol.accept() method, John Snow, 2021/08/03
[PATCH v3 10/25] python/aqmp: add configurable read buffer limit, John Snow, 2021/08/03