def get_transaction_metadata(self, app, txid):
""" Fetch transaction state.
Args:
app: A string specifying an application ID.
txid: An integer specifying a transaction ID.
Returns:
A dictionary containing transaction state.
"""
select = (
'SELECT namespace, operation, path, start_time, is_xg, in_progress, '
' entity, task '
'FROM transactions '
'WHERE txid_hash = %(txid_hash)s ')
parameters = {'txid_hash': tx_partition(app, txid)}
try:
results = yield self.tornado_cassandra.execute(select, parameters)
except dbconstants.TRANSIENT_CASSANDRA_ERRORS:
message = 'Exception while inserting entities in a transaction'
logger.exception(message)
raise AppScaleDBConnectionError(message)
metadata = {'puts': {}, 'deletes': [], 'tasks': [], 'reads': set()}
for result in results:
if result.operation == TxnActions.START:
metadata['start'] = result.start_time
metadata['is_xg'] = result.is_xg
metadata['in_progress'] = set()
if metadata['in_progress'] is not None:
metadata['in_progress'] = set(
struct.unpack('q' * int(len(result.in_progress) / 8),
result.in_progress))
if result.operation == TxnActions.MUTATE:
key = create_key(app, result.namespace, result.path)
if result.entity is None:
metadata['deletes'].append(key)
else:
metadata['puts'][key.Encode()] = result.entity
if result.operation == TxnActions.GET:
group_key = create_key(app, result.namespace, result.path)
metadata['reads'].add(group_key.Encode())
if result.operation == TxnActions.ENQUEUE_TASK:
service_id, version_id, task_pb = result.task.split('_', 2)
task_metadata = {
'service_id': service_id,
'version_id': version_id,
'task': taskqueue_service_pb.TaskQueueAddRequest(task_pb)
}
metadata['tasks'].append(task_metadata)
raise gen.Return(metadata)
def get_transaction_metadata(self, app, txid):
""" Fetch transaction state.
Args:
app: A string specifying an application ID.
txid: An integer specifying a transaction ID.
Returns:
A dictionary containing transaction state.
"""
select = (
'SELECT namespace, operation, path, start_time, is_xg, in_progress, '
' entity, task '
'FROM transactions '
'WHERE txid_hash = %(txid_hash)s '
)
parameters = {'txid_hash': tx_partition(app, txid)}
try:
results = yield self.tornado_cassandra.execute(select, parameters)
except dbconstants.TRANSIENT_CASSANDRA_ERRORS:
message = 'Exception while inserting entities in a transaction'
logger.exception(message)
raise AppScaleDBConnectionError(message)
metadata = {'puts': {}, 'deletes': [], 'tasks': [], 'reads': set()}
for result in results:
if result.operation == TxnActions.START:
metadata['start'] = result.start_time
metadata['is_xg'] = result.is_xg
metadata['in_progress'] = set()
if metadata['in_progress'] is not None:
metadata['in_progress'] = set(
struct.unpack('q' * int(len(result.in_progress) / 8),
result.in_progress))
if result.operation == TxnActions.MUTATE:
key = create_key(app, result.namespace, result.path)
if result.entity is None:
metadata['deletes'].append(key)
else:
metadata['puts'][key.Encode()] = result.entity
if result.operation == TxnActions.GET:
group_key = create_key(app, result.namespace, result.path)
metadata['reads'].add(group_key.Encode())
if result.operation == TxnActions.ENQUEUE_TASK:
service_id, version_id, task_pb = result.task.split('_', 2)
task_metadata = {
'service_id': service_id,
'version_id': version_id,
'task': taskqueue_service_pb.TaskQueueAddRequest(task_pb)}
metadata['tasks'].append(task_metadata)
raise gen.Return(metadata)