62 lines
1.7 KiB
Python
62 lines
1.7 KiB
Python
# Copyright (c) 2014 Dark Secret Software Inc.
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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
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# 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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import disk_storage
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class Archive(object):
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def __init__(self, filename):
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self._handle = None
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self.filename = filename
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def get_file_handle(self): # pragma: no cover
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return self._handle
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def close(self):
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self._handle.close()
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class ArchiveWriter(Archive):
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"""The active Archive for appending.
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"""
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def __init__(self, filename):
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super(ArchiveWriter, self).__init__(filename)
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self._open_file(filename)
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def _open_file(self, filename):
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# Broken out for testing.
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self._handle = open(filename, "wb+")
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def write(self, metadata, payload):
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binary = disk_storage.pack_notification(payload, metadata)
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for block in binary:
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self._handle.write(block)
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class ArchiveReader(Archive):
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"""The active Archive for consuming.
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"""
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def __init__(self, filename):
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super(ArchiveReader, self).__init__(filename)
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self._open_file(filename)
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def _open_file(self, filename):
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# Broken out for testing.
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self._handle = open(filename, "rb")
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def read(self):
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# (metadata, payload)
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return disk_storage.unpack_notification(self._handle)
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