def test_begin_transaction(self, mock_create_stub):
# Mock gRPC layer
grpc_stub = mock.Mock()
mock_create_stub.return_value = grpc_stub
client = spanner_v1.SpannerClient()
# Mock request
session = client.session_path('[PROJECT]', '[INSTANCE]', '[DATABASE]',
'[SESSION]')
options_ = {}
# Mock response
id_ = b'27'
expected_response = {'id': id_}
expected_response = transaction_pb2.Transaction(**expected_response)
grpc_stub.BeginTransaction.return_value = expected_response
response = client.begin_transaction(session, options_)
self.assertEqual(expected_response, response)
grpc_stub.BeginTransaction.assert_called_once()
args, kwargs = grpc_stub.BeginTransaction.call_args
self.assertEqual(len(args), 2)
self.assertEqual(len(kwargs), 1)
self.assertIn('metadata', kwargs)
actual_request = args[0]
expected_request = spanner_pb2.BeginTransactionRequest(
session=session, options=options_)
self.assertEqual(expected_request, actual_request)
def test_begin_transaction(self):
# Setup Expected Response
id_ = b"27"
expected_response = {"id": id_}
expected_response = transaction_pb2.Transaction(**expected_response)
# Mock the API response
channel = ChannelStub(responses=[expected_response])
patch = mock.patch("google.api_core.grpc_helpers.create_channel")
with patch as create_channel:
create_channel.return_value = channel
client = spanner_v1.SpannerClient()
# Setup Request
session = client.session_path("[PROJECT]", "[INSTANCE]", "[DATABASE]",
"[SESSION]")
options_ = {}
response = client.begin_transaction(session, options_)
assert expected_response == response
assert len(channel.requests) == 1
expected_request = spanner_pb2.BeginTransactionRequest(
session=session, options=options_)
actual_request = channel.requests[0][1]
assert expected_request == actual_request
def begin_transaction(self, session, options_, options=None):
"""
Begins a new transaction. This step can often be skipped:
``Read``, ``ExecuteSql`` and
``Commit`` can begin a new transaction as a
side-effect.
Example:
>>> from google.cloud import spanner_v1
>>>
>>> client = spanner_v1.SpannerClient()
>>>
>>> session = client.session_path('[PROJECT]', '[INSTANCE]', '[DATABASE]', '[SESSION]')
>>> options_ = {}
>>>
>>> response = client.begin_transaction(session, options_)
Args:
session (str): Required. The session in which the transaction runs.
options_ (Union[dict, ~google.cloud.spanner_v1.types.TransactionOptions]): Required. Options for the new transaction.
If a dict is provided, it must be of the same form as the protobuf
message :class:`~google.cloud.spanner_v1.types.TransactionOptions`
options (~google.gax.CallOptions): Overrides the default
settings for this call, e.g, timeout, retries etc.
Returns:
A :class:`~google.cloud.spanner_v1.types.Transaction` instance.
Raises:
:exc:`google.gax.errors.GaxError` if the RPC is aborted.
:exc:`ValueError` if the parameters are invalid.
"""
request = spanner_pb2.BeginTransactionRequest(
session=session, options=options_)
return self._begin_transaction(request, options)
def begin_transaction(self,
session,
options_,
retry=google.api_core.gapic_v1.method.DEFAULT,
timeout=google.api_core.gapic_v1.method.DEFAULT,
metadata=None):
"""
Begins a new transaction. This step can often be skipped:
``Read``, ``ExecuteSql`` and
``Commit`` can begin a new transaction as a
side-effect.
Example:
>>> from google.cloud import spanner_v1
>>>
>>> client = spanner_v1.SpannerClient()
>>>
>>> session = client.session_path('[PROJECT]', '[INSTANCE]', '[DATABASE]', '[SESSION]')
>>> options_ = {}
>>>
>>> response = client.begin_transaction(session, options_)
Args:
session (str): Required. The session in which the transaction runs.
options_ (Union[dict, ~google.cloud.spanner_v1.types.TransactionOptions]): Required. Options for the new transaction.
If a dict is provided, it must be of the same form as the protobuf
message :class:`~google.cloud.spanner_v1.types.TransactionOptions`
retry (Optional[google.api_core.retry.Retry]): A retry object used
to retry requests. If ``None`` is specified, requests will not
be retried.
timeout (Optional[float]): The amount of time, in seconds, to wait
for the request to complete. Note that if ``retry`` is
specified, the timeout applies to each individual attempt.
Returns:
A :class:`~google.cloud.spanner_v1.types.Transaction` instance.
Raises:
google.api_core.exceptions.GoogleAPICallError: If the request
failed for any reason.
google.api_core.exceptions.RetryError: If the request failed due
to a retryable error and retry attempts failed.
ValueError: If the parameters are invalid.
"""
request = spanner_pb2.BeginTransactionRequest(
session=session,
options=options_,
)
return self._begin_transaction(
request, metadata=metadata, retry=retry, timeout=timeout)
def _transaction(stub):
"""Probe to test BeginTransaction, Commit and Rollback grpc from Spanner stub.
Args:
stub: An object of SpannerStub.
"""
_transaction_tracer = initialize_tracer()
with _transaction_tracer.span(name='_transaction') as root_span:
root_span.add_annotation('endpoint info available',
endpoint=_SPANNER_TARGET)
session = None
try:
with _transaction_tracer.span(name='stub.CreateSession'):
session = stub.CreateSession(
spanner_pb2.CreateSessionRequest(database=_DATABASE))
txn_options = transaction_pb2.TransactionOptions(
read_write=transaction_pb2.TransactionOptions.ReadWrite())
txn_request = spanner_pb2.BeginTransactionRequest(
session=session.name,
options=txn_options,
)
# Probing BeginTransaction call
with _transaction_tracer.span(name='stub.BeginTransaction'):
txn = stub.BeginTransaction(txn_request)
# Probing Commit call
commit_request = spanner_pb2.CommitRequest(session=session.name,
transaction_id=txn.id)
with _transaction_tracer.span(name='stub.Commit'):
stub.Commit(commit_request)
# Probing Rollback call
txn = stub.BeginTransaction(txn_request)
rollback_request = spanner_pb2.RollbackRequest(
session=session.name, transaction_id=txn.id)
with _transaction_tracer.span(name='stub.Rollback'):
stub.Rollback(rollback_request)
finally:
if session is not None:
with _transaction_tracer.span(name='stub.DeleteSession'):
stub.DeleteSession(
spanner_pb2.DeleteSessionRequest(name=session.name))
def test_begin_transaction(self):
# Setup Expected Response
id_ = b'27'
expected_response = {'id': id_}
expected_response = transaction_pb2.Transaction(**expected_response)
# Mock the API response
channel = ChannelStub(responses=[expected_response])
client = spanner_v1.SpannerClient(channel=channel)
# Setup Request
session = client.session_path('[PROJECT]', '[INSTANCE]', '[DATABASE]',
'[SESSION]')
options_ = {}
response = client.begin_transaction(session, options_)
assert expected_response == response
assert len(channel.requests) == 1
expected_request = spanner_pb2.BeginTransactionRequest(
session=session, options=options_)
actual_request = channel.requests[0][1]
assert expected_request == actual_request
