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Store item hashes in status, use them to detect bogus etag changes

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Fix #257
This commit is contained in:
Markus Unterwaditzer 2015-11-28 15:55:36 +01:00
parent b144ae1701
commit 1d5216f2a3
1 changed files with 27 additions and 5 deletions
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32
vdirsyncer/sync.py
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@ -129,8 +129,21 @@ class StorageSyncer(object):
_store_props(ident, props)
def is_changed(self, ident):
meta = self.status.get(ident, None)
return meta is None or self.idents[ident]['etag'] != meta['etag']
status = self.status.get(ident, None)
meta = self.idents[ident]
if status is None: # new item
return True
if meta['etag'] != status['etag']: # etag changed
old_hash = status.get('hash')
if old_hash is None or meta['item'].hash != old_hash:
# item actually changed
return True
else:
# only etag changed
status['etag'] = meta['etag']
return False
def _status_migrate(status):
@ -152,7 +165,8 @@ def _compress_meta(meta):
item content'''
return {
'href': meta['href'],
'etag': meta['etag']
'etag': meta['etag'],
'hash': meta['item'].hash
}
def sync(storage_a, storage_b, status, conflict_resolution=None,
@ -225,7 +239,11 @@ def _action_upload(ident, source, dest):
dest_href, dest_etag = dest.storage.upload(item)
source.status[ident] = _compress_meta(source_meta)
dest.status[ident] = {'href': dest_href, 'etag': dest_etag}
dest.status[ident] = {
'href': dest_href,
'hash': source_meta['item'].hash,
'etag': dest_etag
}
return inner
@ -249,7 +267,11 @@ def _action_update(ident, source, dest):
assert isinstance(dest_etag, (bytes, text_type))
source.status[ident] = _compress_meta(source_meta)
dest.status[ident] = {'href': dest_href, 'etag': dest_etag}
dest.status[ident] = {
'href': dest_href,
'hash': source_meta['item'].hash,
'etag': dest_etag
}
return inner