def store(self, oid, serial, data, version, transaction):
if transaction is not self._transaction:
raise POSException.StorageTransactionError(self, transaction)
if version:
raise POSException.Unsupported("Versions aren't supported")
self._lock_acquire()
try:
if oid in self._index:
oserial = self._index[oid][:8]
if serial != oserial:
rdata = self.tryToResolveConflict(oid, oserial, serial,
data)
if rdata is None:
raise POSException.ConflictError(oid=oid,
serials=(oserial,
serial),
data=data)
else:
data = rdata
self._tindex[oid] = self._tid + data
finally:
self._lock_release()
return self._tid
def loadBlob(self, oid, serial):
# Load a blob. If it isn't present and we have a shared blob
# directory, then assume that it doesn't exist on the server
# and return None.
if self.fshelper is None:
raise POSException.Unsupported("No blob cache directory is "
"configured.")
blob_filename = self.fshelper.getBlobFilename(oid, serial)
if self.shared_blob_dir:
if os.path.exists(blob_filename):
return blob_filename
else:
# We're using a server shared cache. If the file isn't
# here, it's not anywhere.
raise POSException.POSKeyError(
"No blob file at %s" % blob_filename, oid, serial)
if os.path.exists(blob_filename):
return _accessed(blob_filename)
# First, we'll create the directory for this oid, if it doesn't exist.
self.fshelper.createPathForOID(oid)
# OK, it's not here and we (or someone) needs to get it. We
# want to avoid getting it multiple times. We want to avoid
# getting it multiple times even accross separate client
# processes on the same machine. We'll use file locking.
lock = _lock_blob(blob_filename)
try:
# We got the lock, so it's our job to download it. First,
# we'll double check that someone didn't download it while we
# were getting the lock:
if os.path.exists(blob_filename):
return _accessed(blob_filename)
# Ask the server to send it to us. When this function
# returns, it will have been sent. (The recieving will
# have been handled by the asyncore thread.)
self._call('sendBlob', oid, serial)
if os.path.exists(blob_filename):
return _accessed(blob_filename)
raise POSException.POSKeyError("No blob file", oid, serial)
finally:
lock.close()
def loadSerial(self, oid, serial):
raise POSException.Unsupported(
"Retrieval of historical revisions is not supported")
