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Code Issues Releases Wiki Activity

Port cache to pack/unpack

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This commit is contained in:
Jonas Borgström 2010-10-21 21:30:10 +02:00
parent f0240fbae6
commit a9f37b96e4
1 changed files with 8 additions and 13 deletions
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21
dedupestore/cache.py
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@ -28,19 +28,15 @@ def open(self):
if not os.path.exists(self.path):
return
data = open(self.path, 'rb').read()
id = data[:32]
data = data[32:]
if hashlib.sha256(data).digest() != id:
raise Exception('Cache hash did not match')
data = msgpack.unpackb(zlib.decompress(data))
version = data.get('version')
cache = unpack(data)
version = cache.get('version')
if version != 1:
logging.error('Unsupported cache version %r' % version)
return
if data['store'] != self.store.uuid:
if cache['store'] != self.store.uuid:
raise Exception('Cache UUID mismatch')
self.chunkmap = data['chunkmap']
self.tid = data['tid']
self.chunkmap = cache['chunkmap']
self.tid = cache['tid']
def init(self):
"""Initializes cache by fetching and reading all archive indicies
@ -62,18 +58,17 @@ def init(self):
def save(self):
assert self.store.state == self.store.OPEN
data = {'version': 1,
cache = {'version': 1,
'store': self.store.uuid,
'chunkmap': self.chunkmap,
'tid': self.store.tid,
}
_, data = pack(cache)
cachedir = os.path.dirname(self.path)
if not os.path.exists(cachedir):
os.makedirs(cachedir)
with open(self.path, 'wb') as fd:
data = zlib.compress(msgpack.packb(data))
id = hashlib.sha256(data).digest()
fd.write(id + data)
fd.write(data)
def add_chunk(self, id, data):
if self.seen_chunk(id):