diff options
Diffstat (limited to 'synapse/util/distributor.py')
| -rw-r--r-- | synapse/util/distributor.py | 28 |
1 files changed, 26 insertions, 2 deletions
diff --git a/synapse/util/distributor.py b/synapse/util/distributor.py index da20523b70..22a857a306 100644 --- a/synapse/util/distributor.py +++ b/synapse/util/distributor.py @@ -12,10 +12,12 @@ # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. - +import inspect import logging from twisted.internet import defer +from twisted.internet.defer import Deferred, fail, succeed +from twisted.python import failure from synapse.logging.context import make_deferred_yieldable, run_in_background from synapse.metrics.background_process_metrics import run_as_background_process @@ -79,6 +81,28 @@ class Distributor(object): run_as_background_process(name, self.signals[name].fire, *args, **kwargs) +def maybeAwaitableDeferred(f, *args, **kw): + """ + Invoke a function that may or may not return a Deferred or an Awaitable. + + This is a modified version of twisted.internet.defer.maybeDeferred. + """ + try: + result = f(*args, **kw) + except Exception: + return fail(failure.Failure(captureVars=Deferred.debug)) + + if isinstance(result, Deferred): + return result + # Handle the additional case of an awaitable being returned. + elif inspect.isawaitable(result): + return defer.ensureDeferred(result) + elif isinstance(result, failure.Failure): + return fail(result) + else: + return succeed(result) + + class Signal(object): """A Signal is a dispatch point that stores a list of callables as observers of it. @@ -122,7 +146,7 @@ class Signal(object): ), ) - return defer.maybeDeferred(observer, *args, **kwargs).addErrback(eb) + return maybeAwaitableDeferred(observer, *args, **kwargs).addErrback(eb) deferreds = [run_in_background(do, o) for o in self.observers] |