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Viewing changes to bzrlib/chk_serializer.py

  • Committer: John Arbash Meinel
  • Date: 2009-06-03 14:14:31 UTC
  • mto: This revision was merged to the branch mainline in revision 4410.
  • Revision ID: john@arbash-meinel.com-20090603141431-zeurvzs2iezwzdn5
A bit of code restructuring.
Move bzrlib/_bencode_py.py back to bzrlib/util/_bencode_py.py
Leaving it as _bencode_py.py so that people don't accidentally
import the old version.
Renaming _bencode_c.pyx => _bencode_pyx.pyx to conform to new naming scheme.

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bzrlib/chk_serializer.py
 
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# Copyright (C) 2008 Canonical Ltd
 
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#
 
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# This program is free software; you can redistribute it and/or modify
 
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# it under the terms of the GNU General Public License as published by
 
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# the Free Software Foundation; either version 2 of the License, or
 
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# (at your option) any later version.
 
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#
 
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# This program is distributed in the hope that it will be useful,
 
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
 
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
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# GNU General Public License for more details.
 
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#
 
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# You should have received a copy of the GNU General Public License
 
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# along with this program; if not, write to the Free Software
 
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 
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"""Serializer object for CHK based inventory storage."""
 
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from cStringIO import (
 
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    StringIO,
 
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    )
 
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from bzrlib import (
 
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    bencode,
 
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    cache_utf8,
 
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    inventory,
 
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    osutils,
 
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    revision as _mod_revision,
 
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    xml5,
 
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    xml6,
 
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    )
 
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class BEncodeRevisionSerializer1(object):
 
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    """Simple revision serializer based around bencode. 
 
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    """
 
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    def write_revision_to_string(self, rev):
 
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        encode_utf8 = cache_utf8.encode
 
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        ret = {
 
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            "revision-id": rev.revision_id,
 
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            "timestamp": "%.3f" % rev.timestamp,
 
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            "parent-ids": rev.parent_ids,
 
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            "inventory-sha1": rev.inventory_sha1,
 
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            "committer": encode_utf8(rev.committer),
 
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            "message": encode_utf8(rev.message),
 
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            }
 
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        revprops = {}
 
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        for key, value in rev.properties.iteritems():
 
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            revprops[key] = encode_utf8(value)
 
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        ret["properties"] = revprops
 
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        if rev.timezone is not None:
 
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            ret["timezone"] = rev.timezone
 
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        return bencode.bencode(ret)
 
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    def write_revision(self, rev, f):
 
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        f.write(self.write_revision_to_string(rev))
 
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    def read_revision_from_string(self, text):
 
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        decode_utf8 = cache_utf8.decode
 
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        ret = bencode.bdecode(text)
 
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        rev = _mod_revision.Revision(
 
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            committer=decode_utf8(ret["committer"]),
 
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            revision_id=ret["revision-id"],
 
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            parent_ids=ret["parent-ids"],
 
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            inventory_sha1=ret["inventory-sha1"],
 
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            timestamp=float(ret["timestamp"]),
 
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            message=decode_utf8(ret["message"]),
 
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            properties={})
 
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        if "timezone" in ret:
 
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            rev.timezone = ret["timezone"]
 
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        else:
 
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            rev.timezone = None
 
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        for key, value in ret["properties"].iteritems():
 
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            rev.properties[key] = decode_utf8(value)
 
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        return rev
 
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    def read_revision(self, f):
 
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        return self.read_revision_from_string(f.read())
 
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class CHKSerializerSubtree(BEncodeRevisionSerializer1, xml6.Serializer_v6):
 
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    """A CHKInventory based serializer that supports tree references"""
 
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    supported_kinds = set(['file', 'directory', 'symlink', 'tree-reference'])
 
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    format_num = '9'
 
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    revision_format_num = None
 
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    support_altered_by_hack = False
 
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    def _unpack_entry(self, elt):
 
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        kind = elt.tag
 
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        if not kind in self.supported_kinds:
 
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            raise AssertionError('unsupported entry kind %s' % kind)
 
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        if kind == 'tree-reference':
 
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            file_id = elt.attrib['file_id']
 
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            name = elt.attrib['name']
 
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            parent_id = elt.attrib['parent_id']
 
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            revision = elt.get('revision')
 
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            reference_revision = elt.get('reference_revision')
 
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            return inventory.TreeReference(file_id, name, parent_id, revision,
 
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                                           reference_revision)
 
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        else:
 
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            return xml6.Serializer_v6._unpack_entry(self, elt)
 
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    def __init__(self, node_size, search_key_name):
 
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        self.maximum_size = node_size
 
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        self.search_key_name = search_key_name
 
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class CHKSerializer(xml5.Serializer_v5):
 
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    """A CHKInventory based serializer with 'plain' behaviour."""
 
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    format_num = '9'
 
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    revision_format_num = None
 
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    support_altered_by_hack = False
 
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    def __init__(self, node_size, search_key_name):
 
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        self.maximum_size = node_size
 
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        self.search_key_name = search_key_name
 
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chk_serializer_255_bigpage = CHKSerializer(65536, 'hash-255-way')
 
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class CHKBEncodeSerializer(BEncodeRevisionSerializer1, CHKSerializer):
 
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    """A CHKInventory and BEncode based serializer with 'plain' behaviour."""
 
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    format_num = '10'
 
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chk_bencode_serializer = CHKBEncodeSerializer(65536, 'hash-255-way')