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Integration with L{twisted.python.log}.
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L{ILogObserver} that wraps a L{twisted.python.log.ILogObserver}.
Received (new-style) events are modified prior to forwarding to
the legacy observer to ensure compatibility with observers that
expect legacy events.
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@param legacyObserver: a legacy observer to which this observer will
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ensure compatibility.
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Publish an old-style (L{twisted.python.log}) event to a new-style
(L{twisted.logger}) observer.
@note: It's possible that a new-style event was sent to a
L{LegacyLogObserverWrapper}, and may now be getting sent back to a
new-style observer. In this case, it's already a new-style event,
adapted to also look like an old-style event, and we don't need to
tweak it again to be a new-style event, hence this checks for
already-defined new-style keys.
@param observer: A new-style observer to handle this event.
@param eventDict: An L{old-style <twisted.python.log>}, log event.
@param textFromEventDict: callable that can format an old-style event as a
string. Passed here rather than imported to avoid circular dependency.
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