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# Copyright 2015, Google Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
# * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
"""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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