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64 lines
2.9 KiB
Python
64 lines
2.9 KiB
Python
# Copyright 2012 Google Inc.
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# Copyright (c) 2006,2007 Mitch Garnaat http://garnaat.org/
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#
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# Permission is hereby granted, free of charge, to any person obtaining a
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# copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish, dis-
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# tribute, sublicense, and/or sell copies of the Software, and to permit
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# persons to whom the Software is furnished to do so, subject to the fol-
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# lowing conditions:
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#
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# The above copyright notice and this permission notice shall be included
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# in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
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# ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
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# SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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# IN THE SOFTWARE.
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def versioned_bucket_lister(bucket, prefix='', delimiter='',
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marker='', generation_marker='', headers=None):
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"""
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A generator function for listing versioned objects.
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"""
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more_results = True
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k = None
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while more_results:
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rs = bucket.get_all_versions(prefix=prefix, marker=marker,
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generation_marker=generation_marker,
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delimiter=delimiter, headers=headers,
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max_keys=999)
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for k in rs:
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yield k
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marker = rs.next_marker
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generation_marker = rs.next_generation_marker
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more_results= rs.is_truncated
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class VersionedBucketListResultSet(object):
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"""
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A resultset for listing versions within a bucket. Uses the bucket_lister
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generator function and implements the iterator interface. This
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transparently handles the results paging from GCS so even if you have
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many thousands of keys within the bucket you can iterate over all
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keys in a reasonably efficient manner.
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"""
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def __init__(self, bucket=None, prefix='', delimiter='', marker='',
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generation_marker='', headers=None):
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self.bucket = bucket
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self.prefix = prefix
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self.delimiter = delimiter
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self.marker = marker
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self.generation_marker = generation_marker
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self.headers = headers
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def __iter__(self):
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return versioned_bucket_lister(self.bucket, prefix=self.prefix,
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delimiter=self.delimiter,
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marker=self.marker,
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generation_marker=self.generation_marker,
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headers=self.headers)
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