76 lines
2.8 KiB
Python
76 lines
2.8 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2015 Google Inc. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Helper functions for testing calls to the Rewrite API."""
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from __future__ import absolute_import
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from __future__ import print_function
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from __future__ import division
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from __future__ import unicode_literals
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class RewriteHaltException(Exception):
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pass
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class HaltingRewriteCallbackHandler(object):
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"""Test callback handler for intentionally stopping a rewrite operation."""
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def __init__(self, halt_at_byte):
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self._halt_at_byte = halt_at_byte
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# pylint: disable=invalid-name
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def call(self, total_bytes_rewritten, unused_total_size):
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"""Forcibly exits if the operation has passed the halting point."""
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if total_bytes_rewritten >= self._halt_at_byte:
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raise RewriteHaltException('Artificially halting rewrite')
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class EnsureRewriteResumeCallbackHandler(object):
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"""Test callback handler for ensuring a rewrite operation resumed."""
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def __init__(self, required_byte):
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self._required_byte = required_byte
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# pylint: disable=invalid-name
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def call(self, total_bytes_rewritten, unused_total_size):
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"""Exits if the total bytes rewritten is less than expected."""
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if total_bytes_rewritten <= self._required_byte:
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raise RewriteHaltException(
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'Rewrite did not resume; %s bytes written, but %s bytes should '
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'have already been written.' %
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(total_bytes_rewritten, self._required_byte))
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class EnsureRewriteRestartCallbackHandler(object):
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"""Test callback handler for ensuring a rewrite operation restarted."""
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def __init__(self, required_byte):
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self._required_byte = required_byte
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self._got_restart_bytes = False
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# pylint: disable=invalid-name
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def call(self, total_bytes_rewritten, unused_total_size):
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"""Exits if the total bytes rewritten is greater than expected."""
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if not self._got_restart_bytes:
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if total_bytes_rewritten <= self._required_byte:
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# Restarted successfully, so future calls are allowed to rewrite the
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# rest of the bytes.
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self._got_restart_bytes = True
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else:
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raise RewriteHaltException(
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'Rewrite did not restart; %s bytes written, but no more than %s '
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'bytes should have already been written.' %
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(total_bytes_rewritten, self._required_byte))
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