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Add some docs

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This commit is contained in:
Erik Johnston 2015-05-08 16:52:49 +01:00
parent 4ac1941592
commit da1aa07db5
1 changed files with 15 additions and 3 deletions
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18
synapse/util/logcontext.py
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@ -134,13 +134,25 @@ class PreserveLoggingContext(object):
def preserve_context_over_fn(fn, *args, **kwargs): def preserve_context_over_fn(fn, *args, **kwargs):
with PreserveLoggingContext(): """Takes a function and invokes it with the given arguments, but removes
deferred = fn(*args, **kwargs) and restores the current logging context while doing so.
return preserve_context_over_deferred(deferred) If the result is a deferred, call preserve_context_over_deferred before
returning it.
"""
with PreserveLoggingContext():
res = fn(*args, **kwargs)
if isinstance(res, defer.Deferred):
return preserve_context_over_deferred(res)
else:
return res
def preserve_context_over_deferred(deferred): def preserve_context_over_deferred(deferred):
"""Given a deferred wrap it such that any callbacks added later to it will
be invoked with the current context.
"""
d = defer.Deferred() d = defer.Deferred()
current_context = LoggingContext.current_context() current_context = LoggingContext.current_context()