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python: support recording QMP session to a file

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When running QMP commands with very large response payloads, it is often
not easy to spot the info you want. If we can save the response to a
file then tools like 'grep' or 'jq' can be used to extract information.

For convenience of processing, we merge the QMP command and response
dictionaries together:

  {
      "arguments": {},
      "execute": "query-kvm",
      "return": {
          "enabled": false,
          "present": true
      }
  }

Example usage

  $ ./scripts/qmp/qmp-shell-wrap -l q.log -p -- ./build/qemu-system-x86_64 -display none
  Welcome to the QMP low-level shell!
  Connected
  (QEMU) query-kvm
  {
      "return": {
          "enabled": false,
          "present": true
      }
  }
  (QEMU) query-mice
  {
      "return": [
          {
              "absolute": false,
              "current": true,
              "index": 2,
              "name": "QEMU PS/2 Mouse"
          }
      ]
  }

 $ jq --slurp '. | to_entries[] | select(.value.execute == "query-kvm") |
               .value.return.enabled' < q.log
   false

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-id: 20220128161157.36261-3-berrange@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
This commit is contained in:
Daniel P. Berrangé 2022-01-28 16:11:57 +00:00 • committed by John Snow
parent 439125293c
commit 5c66d7d8de
2 changed files with 25 additions and 7 deletions
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3
python/setup.cfg
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@ -114,7 +114,10 @@ ignore_missing_imports = True
# no Warning level messages displayed, use "--disable=all --enable=classes
# --disable=W".
disable=consider-using-f-string,
consider-using-with,
too-many-arguments,
too-many-function-args, # mypy handles this with less false positives.
too-many-instance-attributes,
no-member, # mypy also handles this better.
[pylint.basic]