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Code Issues Releases Wiki Activity

bandedstore: Handle aborted transactions better

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This commit is contained in:
Jonas Borgström 2010-10-13 22:18:54 +02:00
parent 2eea138c92
commit af8c943694
2 changed files with 14 additions and 3 deletions
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4
.gitignore vendored Normal file
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@ -0,0 +1,4 @@
build
*.pyc
*.pyo

13
dedupestore/bandstore.py
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@ -35,6 +35,10 @@ def _begin(self):
self.state = self.OPEN
self.band = None
self.to_delete = set()
band = self.next_band
while os.path.exists(self.band_filename(band)):
os.unlink(self.band_filename(band))
band += 1
def create(self, path):
os.mkdir(path)
@ -84,18 +88,21 @@ def get(self, ns, id):
else:
raise self.DoesNotExist
def band_filename(self, band):
return os.path.join(self.path, 'bands', str(band))
def retrieve_data(self, band, offset, size):
with open(os.path.join(self.path, 'bands', str(band)), 'rb') as fd:
with open(self.band_filename(band), 'rb') as fd:
fd.seek(offset)
return fd.read(size)
def store_data(self, data):
if self.band is None:
self.band = self.next_band
assert not os.path.exists(os.path.join(self.path, 'bands', str(self.band)))
assert not os.path.exists(self.band_filename(self.band))
self.next_band += 1
band = self.band
with open(os.path.join(self.path, 'bands', str(band)), 'ab') as fd:
with open(self.band_filename(band), 'ab') as fd:
offset = fd.tell()
fd.write(data)
if offset + len(data) > self.BAND_LIMIT: