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"""A utility useful in tests of asynchronous, event-driven interfaces."""
import threading
from grpc.framework.foundation import stream
[docs]class Callback(stream.Consumer):
"""A utility object useful in tests of asynchronous code."""
def __init__(self):
self._condition = threading.Condition()
self._unary_response = None
self._streamed_responses = []
self._completed = False
self._abortion = None
[docs] def abort(self, abortion):
with self._condition:
self._abortion = abortion
self._condition.notify_all()
[docs] def complete(self, unary_response):
with self._condition:
self._unary_response = unary_response
self._completed = True
self._condition.notify_all()
[docs] def consume(self, streamed_response):
with self._condition:
self._streamed_responses.append(streamed_response)
[docs] def terminate(self):
with self._condition:
self._completed = True
self._condition.notify_all()
[docs] def consume_and_terminate(self, streamed_response):
with self._condition:
self._streamed_responses.append(streamed_response)
self._completed = True
self._condition.notify_all()
[docs] def block_until_terminated(self):
with self._condition:
while self._abortion is None and not self._completed:
self._condition.wait()
[docs] def response(self):
with self._condition:
if self._abortion is None:
return self._unary_response
else:
raise AssertionError('Aborted with abortion "%s"!' % self._abortion)
[docs] def responses(self):
with self._condition:
if self._abortion is None:
return list(self._streamed_responses)
else:
raise AssertionError('Aborted with abortion "%s"!' % self._abortion)
[docs] def abortion(self):
with self._condition:
return self._abortion