def undo_reference(self, data, handle, db_map):
"""
Helper method to undo a reference map entry
"""
try:
if data is None:
db_map.delete(handle, txn=self.txn)
else:
db_map.put(handle, data, txn=self.txn)
except DBERRS, msg:
self.db._log_error()
raise Errors.DbError(msg)
def try_(self, *args, **kwargs):
try:
with BSDDBTxn(self.db.env) as txn:
self.txn = self.db.txn = txn.txn
status = func(self, *args, **kwargs)
if not status:
txn.abort()
self.db.txn = None
return status
except DBERRS, msg:
self.db._log_error()
raise Errors.DbError(msg)
def undo_data(self, data, handle, db_map, emit, signal_root):
"""
Helper method to undo/redo the changes made
"""
try:
if data is None:
emit(signal_root + '-delete', ([handle],))
db_map.delete(handle, txn=self.txn)
else:
ex_data = db_map.get(handle, txn=self.txn)
if ex_data:
signal = signal_root + '-update'
else:
signal = signal_root + '-add'
db_map.put(handle, data, txn=self.txn)
emit(signal, ([handle],))
except DBERRS, msg:
self.db._log_error()
raise Errors.DbError(msg)
