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Update comments and docstring

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Richard van der Hoff 2019-09-25 18:17:39 +01:00
parent 4fb3c129aa
commit a96318127d
1 changed files with 6 additions and 4 deletions
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synapse/metrics/background_process_metrics.py
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@ -175,7 +175,7 @@ def run_as_background_process(desc, func, *args, **kwargs):
Args:
desc (str): a description for this background process type
func: a function, which may return a Deferred
func: a function, which may return a Deferred or a coroutine
args: positional args for func
kwargs: keyword args for func
@ -199,11 +199,13 @@ def run_as_background_process(desc, func, *args, **kwargs):
_background_processes.setdefault(desc, set()).add(proc)
try:
# We ensureDeferred here to handle coroutines
result = func(*args, **kwargs)
# We need this check because ensureDeferred doesn't like when
# func doesn't return a Deferred or coroutine.
# We probably don't have an ensureDeferred in our call stack to handle
# coroutine results, so we need to ensureDeferred here.
#
# But we need this check because ensureDeferred doesn't like being
# called on immediate values (as opposed to Deferreds or coroutines).
if iscoroutine(result):
result = defer.ensureDeferred(result)