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Ordering is important on errbacks so add the cleanup func before creating an ObservableDeferred

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Kegan Dougal 2017-02-13 13:49:44 +00:00
parent 808ddf0ae7
commit d0497425f8
1 changed files with 7 additions and 7 deletions
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14
synapse/rest/client/transactions.py
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@ -87,19 +87,19 @@ class HttpTransactionCache(object):
deferred = fn(*args, **kwargs) deferred = fn(*args, **kwargs)
# We don't add an errback to the raw deferred, so we ask ObservableDeferred
# to swallow the error. This is fine as the error will still be reported
# to the observers.
observable = ObservableDeferred(deferred, consumeErrors=True)
self.transactions[txn_key] = (observable, self.clock.time_msec())
# if the request fails with a Twisted failure, remove it # if the request fails with a Twisted failure, remove it
# from the transaction map. This is done to ensure that we don't # from the transaction map. This is done to ensure that we don't
# cache transient errors like rate-limiting errors, etc. # cache transient errors like rate-limiting errors, etc.
def remove_from_map(err): def remove_from_map(err):
self.transactions.pop(txn_key, None) self.transactions.pop(txn_key, None)
return err return err
observable.addErrback(remove_from_map) deferred.addErrback(remove_from_map)
# We don't add any other errbacks to the raw deferred, so we ask
# ObservableDeferred to swallow the error. This is fine as the error will
# still be reported to the observers.
observable = ObservableDeferred(deferred, consumeErrors=True)
self.transactions[txn_key] = (observable, self.clock.time_msec())
return observable.observe() return observable.observe()
def _cleanup(self): def _cleanup(self):