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# Copyright 2011 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import pytest
from google.cloud import datastore
from google.cloud.exceptions import Conflict
from . import _helpers
@pytest.mark.parametrize("database_id", [None, _helpers.TEST_DATABASE], indirect=True)
def test_transaction_via_with_statement(
datastore_client, entities_to_delete, database_id
):
key = datastore_client.key("Company", "Google")
entity = datastore.Entity(key=key)
entity["url"] = "www.google.com"
with datastore_client.transaction() as xact:
result = datastore_client.get(entity.key)
if result is None:
xact.put(entity)
entities_to_delete.append(entity)
# This will always return after the transaction.
retrieved_entity = datastore_client.get(key)
entities_to_delete.append(retrieved_entity)
assert retrieved_entity == entity
@pytest.mark.parametrize("database_id", [None, _helpers.TEST_DATABASE], indirect=True)
@pytest.mark.parametrize("first_call", ["get", "put", "delete"])
def test_transaction_begin_later(
datastore_client, entities_to_delete, database_id, first_call
):
"""
transactions with begin_later should call begin on first get rpc, or on commit
"""
key = datastore_client.key("Company", "Google")
entity = datastore.Entity(key=key)
entity["url"] = "www.google.com"
datastore_client.put(entity)
result_entity = datastore_client.get(key)
with datastore_client.transaction(begin_later=True) as xact:
assert xact._id is None
assert xact._status == xact._INITIAL
if first_call == "get":
datastore_client.get(entity.key)
assert xact._status == xact._IN_PROGRESS
assert xact._id is not None
elif first_call == "put":
xact.put(entity)
assert xact._status == xact._INITIAL
elif first_call == "delete":
xact.delete(result_entity.key)
assert xact._status == xact._INITIAL
assert xact._status == xact._FINISHED
entities_to_delete.append(result_entity)
@pytest.mark.parametrize("database_id", [None, _helpers.TEST_DATABASE], indirect=True)
@pytest.mark.parametrize("raise_exception", [True, False])
def test_transaction_begin_later_noop(datastore_client, database_id, raise_exception):
"""
empty begin later transactions should terminate quietly
"""
try:
with datastore_client.transaction(begin_later=True) as xact:
assert xact._id is None
assert xact._status == xact._INITIAL
if raise_exception:
raise RuntimeError("test")
except RuntimeError:
pass
assert xact._status == xact._ABORTED
assert xact._id is None
@pytest.mark.parametrize("database_id", [None, _helpers.TEST_DATABASE], indirect=True)
def test_transaction_via_explicit_begin_get_commit(
datastore_client, entities_to_delete, database_id
):
# See
# github.com/GoogleCloudPlatform/google-cloud-python/issues/1859
# Note that this example lacks the threading which provokes the race
# condition in that issue: we are basically just exercising the
# "explicit" path for using transactions.
before_1 = 100
before_2 = 0
transfer_amount = 40
key1 = datastore_client.key("account", "123")
account1 = datastore.Entity(key=key1)
account1["balance"] = before_1
key2 = datastore_client.key("account", "234")
account2 = datastore.Entity(key=key2)
account2["balance"] = before_2
datastore_client.put_multi([account1, account2])
entities_to_delete.append(account1)
entities_to_delete.append(account2)
xact = datastore_client.transaction()
xact.begin()
from_account = datastore_client.get(key1, transaction=xact)
to_account = datastore_client.get(key2, transaction=xact)
from_account["balance"] -= transfer_amount
to_account["balance"] += transfer_amount
xact.put(from_account)
xact.put(to_account)
xact.commit()
after1 = datastore_client.get(key1)
after2 = datastore_client.get(key2)
assert after1["balance"] == before_1 - transfer_amount
assert after2["balance"] == before_2 + transfer_amount
@pytest.mark.parametrize("database_id", [None, _helpers.TEST_DATABASE], indirect=True)
def test_failure_with_contention(datastore_client, entities_to_delete, database_id):
contention_prop_name = "baz"
local_client = _helpers.clone_client(datastore_client)
# Insert an entity which will be retrieved in a transaction
# and updated outside it with a contentious value.
key = local_client.key("BreakTxn", 1234)
orig_entity = datastore.Entity(key=key)
orig_entity["foo"] = "bar"
local_client.put(orig_entity)
entities_to_delete.append(orig_entity)
with local_client.transaction() as txn:
entity_in_txn = local_client.get(key)
# Update the original entity outside the transaction.
orig_entity[contention_prop_name] = "outside"
with pytest.raises(Conflict):
datastore_client.put(orig_entity)
# Try to update the entity which we already updated outside the
# transaction.
entity_in_txn[contention_prop_name] = "inside"
txn.put(entity_in_txn)
# now that transaction is complete, should be able to update outside
datastore_client.put(orig_entity)
@pytest.mark.parametrize("database_id", [None, _helpers.TEST_DATABASE], indirect=True)
def test_failure_with_contention_no_context_manager(
datastore_client, entities_to_delete, database_id
):
contention_prop_name = "baz"
local_client = _helpers.clone_client(datastore_client)
# Insert an entity which will be retrieved in a transaction
# and updated outside it with a contentious value.
key = local_client.key("BreakTxnCM3", 1234)
orig_entity = datastore.Entity(key=key)
orig_entity["foo"] = "bar"
local_client.put(orig_entity)
entities_to_delete.append(orig_entity)
txn = local_client.transaction()
txn.begin()
entity_in_txn = local_client.get(key, transaction=txn)
# Update the original entity outside the transaction.
# should fail due to contention
orig_entity[contention_prop_name] = "outside"
with pytest.raises(Conflict):
datastore_client.put(orig_entity)
# Try to update the entity inside the transaction
entity_in_txn[contention_prop_name] = "inside"
txn.put(entity_in_txn)
txn.commit()
# now that transaction is complete, should be able to update outside
datastore_client.put(orig_entity)