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# -*- coding: utf-8 -*-
# Copyright 2015 Google Inc. All Rights Reserved.
#
# 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.
"""Helper functions for testing calls to the Rewrite API."""
from __future__ import absolute_import
from __future__ import print_function
from __future__ import division
from __future__ import unicode_literals
class RewriteHaltException(Exception):
pass
class HaltingRewriteCallbackHandler(object):
"""Test callback handler for intentionally stopping a rewrite operation."""
def __init__(self, halt_at_byte):
self._halt_at_byte = halt_at_byte
# pylint: disable=invalid-name
def call(self, total_bytes_rewritten, unused_total_size):
"""Forcibly exits if the operation has passed the halting point."""
if total_bytes_rewritten >= self._halt_at_byte:
raise RewriteHaltException('Artificially halting rewrite')
class EnsureRewriteResumeCallbackHandler(object):
"""Test callback handler for ensuring a rewrite operation resumed."""
def __init__(self, required_byte):
self._required_byte = required_byte
# pylint: disable=invalid-name
def call(self, total_bytes_rewritten, unused_total_size):
"""Exits if the total bytes rewritten is less than expected."""
if total_bytes_rewritten <= self._required_byte:
raise RewriteHaltException(
'Rewrite did not resume; %s bytes written, but %s bytes should '
'have already been written.' %
(total_bytes_rewritten, self._required_byte))
class EnsureRewriteRestartCallbackHandler(object):
"""Test callback handler for ensuring a rewrite operation restarted."""
def __init__(self, required_byte):
self._required_byte = required_byte
self._got_restart_bytes = False
# pylint: disable=invalid-name
def call(self, total_bytes_rewritten, unused_total_size):
"""Exits if the total bytes rewritten is greater than expected."""
if not self._got_restart_bytes:
if total_bytes_rewritten <= self._required_byte:
# Restarted successfully, so future calls are allowed to rewrite the
# rest of the bytes.
self._got_restart_bytes = True
else:
raise RewriteHaltException(
'Rewrite did not restart; %s bytes written, but no more than %s '
'bytes should have already been written.' %
(total_bytes_rewritten, self._required_byte))