def __init__(self, client, read_only=False):
self._dg = client
self._dc = client.any_client()
self._ctx = api.TxnContext()
self._finished = False
self._mutated = False
self._read_only = read_only
def __init__(self, client):
self._dc = client
self._ctx = api.TxnContext()
self._dc.set_lin_read(self._ctx)
self._finished = False
self._mutated = False
self._sequencing = api.LinRead.CLIENT_SIDE
def __init__(self, client, read_only=False, best_effort=False):
if not read_only and best_effort:
raise Exception('Best effort transactions are only compatible with '
'read-only transactions')
self._dg = client
self._dc = client.any_client()
self._ctx = api.TxnContext()
self._finished = False
self._mutated = False
self._read_only = read_only
self._best_effort = best_effort
def commit(self, *args, **kwargs):
"""Commits any mutations performed in the transaction. Once the
transaction is committed its lifespan is complete and no further
mutations or commits can be made."""
if self._finished:
raise Exception('Cannot commit a transaction which is complete')
self._finished = True
if not self._mutated: return
txn_context = api.TxnContext(start_ts=self.start_ts,
keys=self.keys,
lin_read=self.lin_read)
resp_txn_context = self.client.stub.CommitOrAbort(
txn_context, *args, **kwargs)
return resp_txn_context
