Add a transaction size limit test

bindings/python/tests/size_limit.py

@@ -0,0 +1,64 @@
+#!/usr/bin/python
+#
+# size_limit.py
+#
+# This source file is part of the FoundationDB open source project
+#
+# Copyright 2013-2019 Apple Inc. and the FoundationDB project authors
+#
+# 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 fdb
+import sys
+
+fdb.api_version(610)
+
+@fdb.transactional
+def setValue(tr, key, value):
+	tr[key] = value
+
+@fdb.transactional
+def setValueWithLimit(tr, key, value, limit):
+	tr.options.set_size_limit(limit)
+	tr[key] = value
+
+def run(clusterFile):
+	db = fdb.open(clusterFile)
+	db.options.set_transaction_timeout(2000)  # 2 seconds
+	db.options.set_transaction_retry_limit(3)
+	value = 'a' * 1024
+
+	setValue(db, 't1', value)
+	assert(value == db['t1'])
+
+	try:
+		db.options.set_transaction_size_limit(1000)
+		setValue(db, 't2', value)
+		assert(False)  # not reached
+	except fdb.impl.FDBError as e:
+		assert(e.code == 2101)  # Transaction exceeds byte limit (2101)
+
+	# clear size limit by setting to a larger value
+	db.options.set_transaction_size_limit(1000000)
+	try:
+		setValueWithLimit(db, 't3', value, 1000)
+		assert(False)  # not reached
+	except fdb.impl.FDBError as e:
+		assert(e.code == 2101)  # Transaction exceeds byte limit (2101)
+
+
+# Expect a cluster file as input. This test will write to the FDB cluster, so
+# be aware of potential side effects.
+if __name__ == '__main__':
+	clusterFile = sys.argv[1]
+	run(clusterFile)