108 lines
3.8 KiB
Python
108 lines
3.8 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 os.path
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import archive
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import utils
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class ArchiveCallback(object):
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def on_open(self, filename):
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"""Called when an Archive is opened."""
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pass
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def on_close(self, filename):
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"""Called when an Archive is closed."""
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pass
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class RollManager(object):
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def __init__(self, filename_template, roll_checker, directory=".",
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archive_class=None, archive_callback=None):
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self.filename_template = filename_template
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self.roll_checker = roll_checker
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self.directory = directory
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self.active_archive = None
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self.archive_class = archive_class
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self.active_filename = None
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self.archive_callback = archive_callback
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def _make_filename(self):
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f = utils.now().strftime(self.filename_template)
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f = f.replace(" ", "_")
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f = f.replace("/", "_")
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return os.path.join(self.directory, f)
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def get_active_archive(self):
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if not self.active_archive:
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self.active_filename = self._make_filename()
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self.active_archive = self.archive_class(self.active_filename)
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if self.archive_callback:
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self.archive_callback.on_open(self.active_filename)
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self.roll_checker.start(self.active_archive)
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return self.active_archive
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def _should_roll_archive(self):
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return self.roll_checker.check(self.active_archive)
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def _roll_archive(self):
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self.close()
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self.get_active_archive()
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def close(self):
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if self.active_archive:
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self.active_archive.close()
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if self.archive_callback:
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self.archive_callback.on_close(self.active_filename)
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self.active_archive = None
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self.active_filename = None
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class ReadingRollManager(RollManager):
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def __init__(self, filename_template, roll_checker, directory=".",
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archive_class = archive.ArchiveReader,
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archive_callback=None):
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super(ReadingRollManager, self).__init__(filename_template,
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roll_checker,
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directory=directory,
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archive_callback=event_callback,
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archive_class=archive_class)
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def read(self):
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pass
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class WritingRollManager(RollManager):
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def __init__(self, filename_template, roll_checker, directory=".",
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archive_class=archive.ArchiveWriter,
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archive_callback=None):
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super(WritingRollManager, self).__init__(
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filename_template,
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roll_checker,
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directory=directory,
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archive_callback=archive_callback,
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archive_class=archive_class)
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def write(self, metadata, payload):
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"""metadata is string:string dict.
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payload must be encoded as string.
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"""
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a = self.get_active_archive()
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a.write(metadata, payload)
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if self._should_roll_archive():
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self._roll_archive()
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