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# Copyright 2015 gRPC authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# 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.
"""Utilities for testing stream-related code."""
from grpc.framework.foundation import stream
class TestConsumer(stream.Consumer):
"""A stream.Consumer instrumented for testing.
Attributes:
calls: A sequence of value-termination pairs describing the history of calls
made on this object.
"""
def __init__(self):
self.calls = []
def consume(self, value):
"""See stream.Consumer.consume for specification."""
self.calls.append((value, False))
def terminate(self):
"""See stream.Consumer.terminate for specification."""
self.calls.append((None, True))
def consume_and_terminate(self, value):
"""See stream.Consumer.consume_and_terminate for specification."""
self.calls.append((value, True))
def is_legal(self):
"""Reports whether or not a legal sequence of calls has been made."""
terminated = False
for value, terminal in self.calls:
if terminated:
return False
elif terminal:
terminated = True
elif value is None:
return False
else: # pylint: disable=useless-else-on-loop
return True
def values(self):
"""Returns the sequence of values that have been passed to this Consumer."""
return [value for value, _ in self.calls if value]
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