Formatting exception handling and fill_missing_fmt_key error

Inizia in fluent/handler.py intorno alla riga collegata 151 e riproduci il traceback di formattazione di Python 3.8+. Traccia come viene gestito ValueError per ogni stile e come risponde il percorso di FluentRecordFormatter con fill_missing_fmt_key=True; il lavoro è completo quando sia la gestione degli errori di formattazione sia il riempimento delle chiavi mancanti funzionano come previsto.

There is ValueError is reraised instead of KeyError in the format method of each style class since python3.8:
https://github.com/python/cpython/issues/79025#issuecomment-1093800953

So formatting error handling and fill_missing_fmt_key=True arg of FluentRecordFormatter does not work correctly.

Traceback (most recent call last):
  File "/usr/lib/python3.10/logging/__init__.py", line 440, in format
    return self._format(record)
  File "/usr/lib/python3.10/logging/__init__.py", line 458, in _format
    return self._fmt.format(**values)
KeyError: 'kubernetes'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/nz/.local/lib/virtualenvs/platform10/lib/python3.10/site-packages/django/core/management/base.py", line 330, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/home/nz/.local/lib/virtualenvs/platform10/lib/python3.10/site-packages/django/core/management/commands/runserver.py", line 61, in execute
    super().execute(*args, **options)
  File "/home/nz/.local/lib/virtualenvs/platform10/lib/python3.10/site-packages/django/core/management/base.py", line 371, in execute
    output = self.handle(*args, **options)
  File "/home/nz/.local/lib/virtualenvs/platform10/lib/python3.10/site-packages/django/core/management/commands/runserver.py", line 96, in handle
    self.run(**options)
  File "/home/nz/.local/lib/virtualenvs/platform10/lib/python3.10/site-packages/django/core/management/commands/runserver.py", line 103, in run
    autoreload.run_with_reloader(self.inner_run, **options)
  File "/home/nz/.local/lib/virtualenvs/platform10/lib/python3.10/site-packages/django/utils/autoreload.py", line 617, in run_with_reloader
    logger.info('Watching for file changes with %s', reloader.__class__.__name__)
  File "/usr/lib/python3.10/logging/__init__.py", line 1477, in info
    self._log(INFO, msg, args, **kwargs)
  File "/usr/lib/python3.10/logging/__init__.py", line 1624, in _log
    self.handle(record)
  File "/usr/lib/python3.10/logging/__init__.py", line 1634, in handle
    self.callHandlers(record)
  File "/usr/lib/python3.10/logging/__init__.py", line 1696, in callHandlers
    hdlr.handle(record)
  File "/usr/lib/python3.10/logging/__init__.py", line 968, in handle
    self.emit(record)
  File "/home/nz/.local/lib/virtualenvs/platform10/lib/python3.10/site-packages/fluent/handler.py", line 232, in emit
    data = self.format(record)
  File "/usr/lib/python3.10/logging/__init__.py", line 943, in format
    return fmt.format(record)
  File "/home/nz/.local/lib/virtualenvs/platform10/lib/python3.10/site-packages/fluent/handler.py", line 97, in format
    data = self._formatter(record)
  File "/home/nz/.local/lib/virtualenvs/platform10/lib/python3.10/site-packages/fluent/handler.py", line 154, in _format_by_dict
    raise exc
  File "/home/nz/.local/lib/virtualenvs/platform10/lib/python3.10/site-packages/fluent/handler.py", line 148, in _format_by_dict
    value = self.__style(value).format(record)
  File "/usr/lib/python3.10/logging/__init__.py", line 442, in format
    raise ValueError('Formatting field not found in record: %s' % e)
ValueError: Formatting field not found in record: 'kubernetes'

ValueError must be handled here