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1082 lines (946 loc) · 35.8 KB
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# Copyright 2025 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
#
# https://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.
"""Basic tests for cel-python."""
import datetime
import gc
import importlib
import importlib.abc
import sys
from typing import Any
from google.protobuf import message_factory
from google.protobuf import duration_pb2 as duration_pb
from google.protobuf import timestamp_pb2 as timestamp_pb
from absl.testing import absltest
from cel_expr_python import cel
from cel.expr.conformance.proto2 import test_all_types_pb2 as test_all_types_pb
@absltest.skipThisClass("Base class")
class _CelTestBase(absltest.TestCase):
options: cel.Options = cel.Options()
def setUp(self):
super().setUp()
self.env = cel.NewEnv(
variables={
"var_bool": cel.Type.BOOL,
"var_int": cel.Type.INT,
"var_uint": cel.Type.UINT,
"var_double": cel.Type.DOUBLE,
"var_str": cel.Type.STRING,
"var_bytes": cel.Type.BYTES,
"var_msg": cel.Type("cel.expr.conformance.proto2.TestAllTypes"),
"var_string_list": cel.Type.List(cel.Type.STRING),
"var_timestamp": cel.Type.TIMESTAMP,
"var_duration": cel.Type.DURATION,
"var_dyn_list": cel.Type.LIST,
"var_int_map": cel.Type.Map(cel.Type.INT, cel.Type.STRING),
"var_string_map": cel.Type.Map(cel.Type.STRING, cel.Type.BOOL),
"var_dyn_map": cel.Type.MAP,
"var_dyn": cel.Type.DYN,
},
options=self.options,
)
self.object_counts_before_test = self._grab_object_counts()
def tearDown(self):
"""Tears down the test environment."""
super().tearDown()
gc.collect()
# Assert that all Arenas have been garbage-collected
self.assertEqual(cel._InternalArena._get_instance_count(), 0)
self._check_for_leaks()
def _grab_object_counts(self) -> dict[str, int]:
gc.collect()
all_objects = gc.get_objects()
type_counts = {}
for obj in all_objects:
obj_type = type(obj)
type_counts[obj_type.__name__] = type_counts.get(obj_type, 0) + 1
return type_counts
def _check_for_leaks(self):
type_counts = self._grab_object_counts()
for key, count in type_counts.items():
if count != self.object_counts_before_test.get(key, 0):
self.fail(
f"Object count for {key} did not match expected count. "
f"Expected: {self.object_counts_before_test.get(key, 0)}, "
f"Actual: {count}",
)
def _eval(
self,
expression: str,
data: dict[str, object] | None = None,
expected_return_type: cel.Type | None = None,
) -> cel.Value:
if data is None:
data = {}
expr: cel.Expression = self.env.compile(expression)
if expected_return_type is not None:
self.assertTrue(
expected_return_type.is_assignable_from(expr.return_type())
)
act: cel.Activation = self.env.Activation(data)
return expr.eval(act)
def testUnsetVar(self):
res: cel.Value = self._eval("var_bool", {})
self.assertEqual(res.type(), cel.Type.ERROR)
self.assertIn(
'No value with name "var_bool" found in Activation', res.value()
)
def testEvalNull(self):
res: cel.Value = self._eval("null", expected_return_type=cel.Type.NULL)
self.assertEqual(res.type(), cel.Type.NULL)
self.assertIsNone(res.value())
self.assertIsNone(res.plain_value())
# Non-idiomatic use of None to represent CEL null value.
# We are doing this just to test that the value is properly evaluated.
res = self._eval(
"var_dyn", {"var_dyn": None}, expected_return_type=cel.Type.DYN
)
self.assertIsNone(res.value())
res = self._eval("var_dyn == null", {"var_dyn": None})
self.assertTrue(res.value())
res = self._eval("type(var_dyn) == null_type", {"var_dyn": None})
self.assertTrue(res.value())
def testEvalBool(self):
res: cel.Value = self._eval("true", expected_return_type=cel.Type.BOOL)
self.assertEqual(res.type(), cel.Type.BOOL)
self.assertEqual(res.value(), True)
self.assertEqual(res.plain_value(), True)
res = self._eval("false")
self.assertEqual(res.value(), False)
res = self._eval("1 + 1 == 2")
self.assertEqual(res.value(), True)
res = self._eval(
"var_bool", {"var_bool": True}, expected_return_type=cel.Type.BOOL
)
self.assertEqual(res.type(), cel.Type.BOOL)
self.assertEqual(res.value(), True)
res = self._eval("var_bool", {"var_bool": False})
self.assertEqual(res.type(), cel.Type.BOOL)
self.assertEqual(res.value(), False)
def testEvalInt64(self):
res: cel.Value = self._eval("42", expected_return_type=cel.Type.INT)
self.assertEqual(res.type(), cel.Type.INT)
self.assertEqual(res.value(), 42)
self.assertEqual(res.plain_value(), 42)
res = self._eval("1000 + 200 + 30 + 4")
self.assertEqual(res.value(), 1234)
res = self._eval(
"var_int", {"var_int": 42}, expected_return_type=cel.Type.INT
)
self.assertEqual(res.type(), cel.Type.INT)
self.assertEqual(res.value(), 42)
res = self._eval("var_int / 2", {"var_int": 42})
self.assertEqual(res.type(), cel.Type.INT)
self.assertEqual(res.value(), 21)
res = self._eval("var_int", {"var_int": CompatibleNumber("42")})
self.assertEqual(res.type(), cel.Type.INT)
self.assertEqual(res.value(), 42)
res = self._eval("var_int", {"var_int": 1000000000000000000000000})
self.assertEqual(res.type(), cel.Type.ERROR)
self.assertTrue(
"int too large" in res.value() or "int too big" in res.value(),
msg=f"Unexpected error message: {res.value()}",
)
res = self._eval("var_int - 2", {"var_int": 3.14})
self.assertEqual(res.type(), cel.Type.ERROR)
self.assertIn(
"'float' object cannot be interpreted as an integer",
res.value(),
)
res = self._eval("var_int", {"var_int": IncompatibleNumber("42")})
self.assertEqual(res.type(), cel.Type.ERROR)
self.assertIn(
"'IncompatibleNumber' object cannot be interpreted as an integer",
res.value(),
)
def testEvalInt64_OutOfRange(self):
with self.assertRaises(Exception) as e:
self._eval("18446744073709551615")
assert "invalid int literal" in str(e.exception)
def testEvalUint64(self):
res: cel.Value = self._eval("42u", expected_return_type=cel.Type.UINT)
self.assertEqual(res.type(), cel.Type.UINT)
self.assertEqual(res.value(), 42)
self.assertEqual(res.plain_value(), 42)
res = self._eval("18446744073709551615u")
self.assertEqual(res.value(), 18446744073709551615)
self.assertEqual(res.plain_value(), 18446744073709551615)
res = self._eval(
"var_uint", {"var_uint": 42}, expected_return_type=cel.Type.UINT
)
self.assertEqual(res.type(), cel.Type.UINT)
self.assertEqual(res.value(), 42)
res = self._eval("var_uint + 1u", {"var_uint": 42})
self.assertEqual(res.type(), cel.Type.UINT)
self.assertEqual(res.value(), 43)
res = self._eval("var_uint + 1u", {"var_uint": -42})
self.assertEqual(res.type(), cel.Type.ERROR)
self.assertTrue(
"can't convert negative value to unsigned int" in res.value()
or "can't convert negative int to unsigned" in res.value(),
msg=f"Unexpected error message: {res.value()}",
)
def testEvalDouble(self):
res: cel.Value = self._eval("3.14", expected_return_type=cel.Type.DOUBLE)
self.assertEqual(res.type(), cel.Type.DOUBLE)
self.assertAlmostEqual(res.value(), 3.14, places=3)
self.assertAlmostEqual(res.plain_value(), 3.14, places=3) # pyrefly: ignore[no-matching-overload]
res = self._eval("3.14 / 2.0")
self.assertAlmostEqual(res.value(), 1.57, places=3)
res = self._eval(
"var_double", {"var_double": 42.0}, expected_return_type=cel.Type.DOUBLE
)
self.assertEqual(res.type(), cel.Type.DOUBLE)
self.assertAlmostEqual(res.value(), 42.0, places=3)
res = self._eval("var_double + 1.0", {"var_double": 42})
self.assertEqual(res.type(), cel.Type.DOUBLE)
self.assertEqual(res.value(), 43)
res = self._eval("var_double/0.0", {"var_double": 42})
self.assertEqual(res.type(), cel.Type.DOUBLE)
self.assertEqual(res.value(), float("inf")) # is infinity
def testEvalString(self):
res: cel.Value = self._eval('"world"', expected_return_type=cel.Type.STRING)
self.assertEqual(res.type(), cel.Type.STRING)
self.assertEqual(res.value(), "world")
self.assertEqual(res.plain_value(), "world")
res = self._eval('"Hello, " + "world!"')
self.assertEqual(res.value(), "Hello, world!")
res = self._eval(
"var_str", {"var_str": "Hello"}, expected_return_type=cel.Type.STRING
)
self.assertEqual(res.type(), cel.Type.STRING)
self.assertEqual(res.value(), "Hello")
res = self._eval("var_str + ', ' + var_str + '!'", {"var_str": "Hello"})
self.assertEqual(res.value(), "Hello, Hello!")
res = self._eval("var_str", {"var_str": 42})
self.assertEqual(res.type(), cel.Type.ERROR)
self.assertIn(
"Unexpected value type for 'var_str': int. (Expected STRING)",
res.value(),
)
def testEvalBytes(self):
res: cel.Value = self._eval("b'abcd'", expected_return_type=cel.Type.BYTES)
self.assertEqual(res.type(), cel.Type.BYTES)
self.assertEqual(res.value(), bytearray("abcd", "ascii"))
self.assertEqual(res.plain_value(), bytearray("abcd", "ascii"))
res = self._eval(
"var_bytes",
{"var_bytes": bytearray(b"Hello!")},
expected_return_type=cel.Type.BYTES,
)
self.assertEqual(res.type(), cel.Type.BYTES)
self.assertEqual(res.value(), bytearray(b"Hello!"))
res = self._eval(
"var_bytes + b' ' + var_bytes", {"var_bytes": bytearray(b"Hello!")}
)
self.assertEqual(res.type(), cel.Type.BYTES)
self.assertEqual(res.value(), bytearray(b"Hello! Hello!"))
def testProto(self):
res: cel.Value = self._eval(
"cel.expr.conformance.proto2.TestAllTypes{"
" single_string: 'hello', "
" single_uint64: 42u, "
" standalone_message: "
" cel.expr.conformance.proto2.TestAllTypes.NestedMessage{"
" bb: 1 + 2 + 3 + 4"
" }"
"}",
expected_return_type=cel.Type(
"cel.expr.conformance.proto2.TestAllTypes"
),
)
self.assertEqual(
res.type(), cel.Type("cel.expr.conformance.proto2.TestAllTypes")
)
msg = res.value()
self.assertEqual(type(msg).__name__, "TestAllTypes")
self.assertEqual(msg.single_string, "hello")
self.assertEqual(msg.single_uint64, 42)
self.assertEqual(msg.standalone_message.bb, 10)
self.assertEqual(res.plain_value(), msg)
msg = test_all_types_pb.TestAllTypes()
msg.single_string = "Hey"
msg.single_double = 3.14
res = self._eval(
"var_msg",
{"var_msg": msg},
expected_return_type=cel.Type(
"cel.expr.conformance.proto2.TestAllTypes"
),
)
self.assertEqual(res.type().is_message(), True)
self.assertTrue(
cel.Type("cel.expr.conformance.proto2.TestAllTypes").is_assignable_from(
res.type()
)
)
self.assertEqual(
res.type().name(), "cel.expr.conformance.proto2.TestAllTypes"
)
msg = res.value()
self.assertEqual(type(msg).__name__, "TestAllTypes")
self.assertEqual(msg.single_string, "Hey")
self.assertEqual(msg.single_double, 3.14)
res = self._eval(
"var_msg.single_string + ', CEL! You are a piece of ' +"
" string(var_msg.single_double)",
{"var_msg": msg},
)
# TODO(b/516948297): Fix double to string conversion on macOS and
# revert to self.assertEqual.
self.assertTrue(
res.value().startswith("Hey, CEL! You are a piece of 3.14")
)
def testProto_unexpectedType(self):
msg = test_all_types_pb.TestAllTypes.NestedMessage
res = self._eval("var_msg", {"var_msg": msg})
self.assertEqual(res.type(), cel.Type.ERROR)
self.assertRegex(
res.value(),
r"Unexpected value type for 'var_msg':"
r" .*. \(Expected cel.expr.conformance.proto2.TestAllTypes\)",
)
def testProto_cannotFindMessageClass(self):
orig_get_message_class = message_factory.GetMessageClass
def failing_get_message_class(descriptor):
del descriptor
raise TypeError(
"Couldn't build proto class because dependency X is missing"
)
try:
message_factory.GetMessageClass = failing_get_message_class
env = cel.NewEnv(options=self.options)
expr = env.compile(
"cel.expr.conformance.proto2.TestAllTypes{single_string: 'hello'}"
)
res = expr.eval(env.Activation())
with self.assertRaisesRegex(
TypeError, "Couldn't find message class for type"
):
res.plain_value()
del res
del expr
del env
finally:
message_factory.GetMessageClass = orig_get_message_class
def testEvalList(self):
res: cel.Value = self._eval(
"[1, 'CEL', true]", expected_return_type=cel.Type.LIST
)
self.assertEqual(res.type(), cel.Type.LIST)
self.assertEqual([item.value() for item in res.value()], [1, "CEL", True])
self.assertEqual(res.plain_value(), [1, "CEL", True])
res = self._eval("[1]", expected_return_type=cel.Type.List(cel.Type.INT))
self.assertEqual(res.type(), cel.Type.LIST)
self.assertEqual(res.value()[0].value(), 1)
res = self._eval(
"["
"cel.expr.conformance.proto2.TestAllTypes{single_string: 'pi'},"
"cel.expr.conformance.proto2.TestAllTypes{single_double: 3.14}"
"]",
expected_return_type=cel.Type.List(
cel.Type("cel.expr.conformance.proto2.TestAllTypes")
),
)
res_list = res.value()
self.assertLen(res_list, 2)
self.assertEqual(res_list[0].value().single_string, "pi")
self.assertEqual(res_list[1].value().single_double, 3.14)
res = self._eval("var_string_list", {"var_string_list": ["foo", "bar"]})
res_list = res.value()
self.assertLen(res_list, 2)
self.assertEqual(res_list[0].value(), "foo")
self.assertEqual(res_list[1].value(), "bar")
res = self._eval("var_dyn_list", {"var_dyn_list": ["pi", 3.14]})
self.assertEqual(res.type(), cel.Type.LIST)
self.assertEqual(res.plain_value(), ["pi", 3.14])
res_list = res.value()
self.assertLen(res_list, 2)
self.assertEqual(res_list[0].type(), cel.Type.STRING)
self.assertEqual(res_list[0].value(), "pi")
self.assertEqual(res_list[1].type(), cel.Type.DOUBLE)
self.assertAlmostEqual(res_list[1].value(), 3.14, places=3)
def testEvalList_unexpectedType(self):
res = self._eval("var_string_list", {"var_string_list": ["pi", 3.14]})
self.assertEqual(res.type(), cel.Type.ERROR)
self.assertIn(
"Unexpected value type for 'var_string_list[1]': float. (Expected"
" STRING)",
res.value(),
)
def testEvalMap(self):
res: cel.Value = self._eval(
"{777: 'CEL', 42: 'Python'}",
expected_return_type=cel.Type.Map(cel.Type.INT, cel.Type.STRING),
)
self.assertEqual(res.type(), cel.Type.MAP)
res_map = res.value()
self.assertLen(res_map, 2)
self.assertEqual(res_map[777].value(), "CEL")
self.assertEqual(res_map[42].value(), "Python")
self.assertEqual(res.plain_value(), {777: "CEL", 42: "Python"})
res = self._eval(
"var_int_map",
{"var_int_map": {777: "CEL", 42: "Python"}},
expected_return_type=cel.Type.Map(cel.Type.INT, cel.Type.STRING),
)
self.assertEqual(res.type(), cel.Type.MAP)
res_map = res.value()
self.assertLen(res_map, 2)
self.assertEqual(res_map[777].value(), "CEL")
self.assertEqual(res_map[42].value(), "Python")
self.assertEqual(res.plain_value(), {777: "CEL", 42: "Python"})
res = self._eval(
"var_string_map", {"var_string_map": {"CEL": True, "Python": 42}}
)
self.assertEqual(res.type(), cel.Type.ERROR)
self.assertIn(
"Unexpected value type for 'var_string_map['Python'] -> 42': int."
" (Expected BOOL)",
res.value(),
)
def testEvalMap_keyTypes(self):
self.assertEqual(
cel.Type.Map(cel.Type.INT, cel.Type.STRING).name(), "MAP<INT, STRING>"
)
self.assertEqual(
cel.Type.Map(cel.Type.UINT, cel.Type.DOUBLE).name(), "MAP<UINT, DOUBLE>"
)
self.assertEqual(
cel.Type.Map(cel.Type.BOOL, cel.Type.LIST).name(),
"MAP<BOOL, LIST<DYN>>",
)
self.assertEqual(
cel.Type.Map(cel.Type.STRING, cel.Type.INT).name(),
"MAP<STRING, INT>",
)
with self.assertRaises(Exception) as e:
cel.Type.Map(cel.Type("foo.bar.Baz"), cel.Type.STRING)
self.assertIn("Unsupported map key type: foo.bar.Baz", str(e.exception))
def testEvalTimestamp(self):
# google.protobuf.Timestamp
ts = timestamp_pb.Timestamp()
res: cel.Value = self._eval(
"timestamp('2025-01-01T00:00:00Z')",
expected_return_type=cel.Type.TIMESTAMP,
)
self.assertEqual(res.type(), cel.Type.TIMESTAMP)
self.assertEqual(res.type(), cel.Type("google.protobuf.Timestamp"))
self.assertEqual(
res.value(),
datetime.datetime(2025, 1, 1, tzinfo=datetime.timezone.utc),
)
self.assertEqual(
res.plain_value(),
datetime.datetime(2025, 1, 1, tzinfo=datetime.timezone.utc),
)
res = self._eval(
"var_timestamp",
{
"var_timestamp": datetime.datetime(
2025, 9, 23, tzinfo=datetime.timezone.utc
)
},
expected_return_type=cel.Type.TIMESTAMP,
)
self.assertEqual(res.type(), cel.Type.TIMESTAMP)
ts.FromDatetime(
datetime.datetime(2025, 9, 23, tzinfo=datetime.timezone.utc)
)
self.assertEqual(
res.value(),
datetime.datetime(2025, 9, 23, tzinfo=datetime.timezone.utc),
)
self.assertEqual(
res.plain_value(),
datetime.datetime(2025, 9, 23, tzinfo=datetime.timezone.utc),
)
ts.FromDatetime(
datetime.datetime(2025, 1, 2, 3, 4, 5, tzinfo=datetime.timezone.utc)
)
res = self._eval(
"var_timestamp",
{"var_timestamp": ts},
)
self.assertEqual(res.type(), cel.Type.TIMESTAMP)
self.assertEqual(
res.value(),
datetime.datetime(2025, 1, 2, 3, 4, 5, tzinfo=datetime.timezone.utc),
)
self.assertEqual(
res.plain_value(),
datetime.datetime(2025, 1, 2, 3, 4, 5, tzinfo=datetime.timezone.utc),
)
res = self._eval(
"var_timestamp",
{"var_timestamp": "yesterday"},
)
self.assertEqual(res.type(), cel.Type.ERROR)
self.assertIn(
"Unexpected value type for 'var_timestamp': str. (Expected TIMESTAMP)",
res.value(),
)
ts.seconds = -1000000000000
res = self._eval(
"var_timestamp",
{"var_timestamp": ts},
)
self.assertEqual(res.type(), cel.Type.ERROR)
self.assertIn(
'Timestamp "-29719-04-05T22:13:20Z" below minimum allowed timestamp'
' "1-01-01T00:00:00Z"',
res.value(),
)
def testEvalDuration(self):
# google.protobuf.Duration
dur = duration_pb.Duration()
res: cel.Value = self._eval(
"duration('1m40s')", expected_return_type=cel.Type.DURATION
)
self.assertEqual(res.type(), cel.Type.DURATION)
self.assertEqual(res.type(), cel.Type("google.protobuf.Duration"))
self.assertEqual(res.value(), datetime.timedelta(seconds=100))
self.assertEqual(res.plain_value(), datetime.timedelta(seconds=100))
res = self._eval(
"var_duration",
{"var_duration": datetime.timedelta(seconds=999)},
expected_return_type=cel.Type.DURATION,
)
self.assertEqual(res.type(), cel.Type.DURATION)
self.assertEqual(res.value(), datetime.timedelta(seconds=999))
self.assertEqual(res.plain_value(), datetime.timedelta(seconds=999))
dur.FromMilliseconds(123456)
res = self._eval(
"var_duration",
{"var_duration": dur},
)
self.assertEqual(res.type(), cel.Type.DURATION)
self.assertEqual(
res.value(), datetime.timedelta(seconds=123, microseconds=456000)
)
self.assertEqual(
res.plain_value(), datetime.timedelta(seconds=123, microseconds=456000)
)
res = self._eval(
"var_duration",
{"var_duration": "forever"},
)
self.assertEqual(res.type(), cel.Type.ERROR)
self.assertIn(
"Unexpected value type for 'var_duration': str. (Expected DURATION)",
res.value(),
)
dur.seconds = 1000000000000
res = self._eval(
"var_duration",
{"var_duration": dur},
)
self.assertEqual(res.type(), cel.Type.ERROR)
self.assertIn(
'Duration "277777777h46m40.456s" above maximum allowed duration '
'"87660000h0.999999999s"',
res.value(),
)
def testDynType(self):
msg = test_all_types_pb.TestAllTypes()
msg.single_string = "Hey"
msg.single_double = 3.14
for item in [
{"value": True, "type": cel.Type.BOOL},
{"value": 42, "type": cel.Type.INT},
{"value": 18446744073709551615, "type": cel.Type.UINT},
{"value": 6.25, "type": cel.Type.DOUBLE},
{"value": "foo", "type": cel.Type.STRING},
{"value": b"foo", "type": cel.Type.BYTES},
{"value": bytearray("bar", "ascii"), "type": cel.Type.BYTES},
{
"value": msg,
"type": cel.Type("cel.expr.conformance.proto2.TestAllTypes"),
},
]:
v = item["value"]
t = item["type"]
res: cel.Value = self._eval("var_dyn", {"var_dyn": v})
self.assertEqual(
res.type(),
t,
"For value: " + str(v) + " returned value: " + str(res.value()),
)
res = self._eval(
"var_dyn",
{"var_dyn": -18446744073709551615},
)
self.assertEqual(res.type(), cel.Type.ERROR)
self.assertIn("out of range for 'var_dyn'", res.value())
res = self._eval(
"var_dyn",
{"var_dyn": 1000000000000000000000000},
)
self.assertEqual(res.type(), cel.Type.ERROR)
self.assertIn("out of range for 'var_dyn'", res.value())
def testDynType_nonCelType(self):
class NonCelValue:
pass
res = self._eval("var_dyn", {"var_dyn": NonCelValue()})
self.assertEqual(res.type(), cel.Type.ERROR)
self.assertIn(
"Non-CEL value type for 'var_dyn': NonCelValue",
res.value(),
)
def testTypeType(self):
res: cel.Value = self._eval(
"type(1)", expected_return_type=cel.Type.Type(cel.Type.INT)
)
self.assertEqual(res.type(), cel.Type.TYPE)
self.assertEqual(res.value(), cel.Type.INT)
res = self._eval(
"type(int)",
expected_return_type=cel.Type.Type(cel.Type.Type(cel.Type.INT)),
)
self.assertEqual(res.type(), cel.Type.TYPE)
self.assertEqual(res.value(), cel.Type.TYPE)
# It's ok to leave cel.TYPE unparameterized
res = self._eval("type(int)", expected_return_type=cel.Type.TYPE)
self.assertEqual(res.type(), cel.Type.TYPE)
self.assertEqual(res.value(), cel.Type.TYPE)
# If the expected type is parameterized, is_assignable_from takes
# into account the type's parameterization.
expr = self.env.compile("type(1)")
self.assertFalse(
cel.Type.Type(cel.Type.STRING).is_assignable_from(expr.return_type())
)
# The following two tests demonstrate a quirk of CEL assignability
# rules. In the case of type checking, `type(1)` is deemed to be
# *not* assignable to Type.STRING. However, in runtime use, it would be seen
# as assignable.
res = self._eval(
"var_bool ? type('a') : type(1)",
{"var_bool": True},
expected_return_type=cel.Type.Type(cel.Type.STRING),
)
self.assertEqual(res.value(), cel.Type.STRING)
res = self._eval(
"var_bool ? type('a') : type(1)",
{"var_bool": False},
expected_return_type=cel.Type.Type(cel.Type.STRING),
)
self.assertEqual(
res.value(), cel.Type.INT
) # This behavior is counterintuitive but works as implemented.
def testTypeInitSignature(self):
self.assertEqual(cel.Type("int"), cel.Type.INT)
self.assertEqual(cel.Type("list<int>"), cel.Type.List(cel.Type.INT))
self.assertEqual(
cel.Type("map<string, dyn>"),
cel.Type.Map(cel.Type.STRING, cel.Type.DYN),
)
self.assertEqual(
cel.Type("cel.expr.conformance.proto2.TestAllTypes"),
cel.Type("cel.expr.conformance.proto2.TestAllTypes"),
)
def testCelExpressionPersistence_checkedExpr(self):
expr: cel.Expression = self.env.compile("var_msg.single_string")
as_bytes: bytes = expr.serialize()
expr = self.env.deserialize(as_bytes)
msg = test_all_types_pb.TestAllTypes()
msg.single_string = "Hey!"
res = expr.eval(self.env.Activation({"var_msg": msg}))
self.assertEqual(res.value(), "Hey!")
def testCelExpressionPersistence_uncheckedExpr(self):
expr: cel.Expression = self.env.compile("runtimely + 2", disable_check=True)
as_bytes: bytes = expr.serialize()
expr = self.env.deserialize(as_bytes)
res = expr.eval(self.env.Activation({"runtimely": 40}))
self.assertEqual(res.value(), 42)
def testCelExpressionPersistence_badSerializedFormat(self):
with self.assertRaises(Exception) as e:
self.env.deserialize("b'foo'")
self.assertIn("Cannot parse serialized CEL expression", str(e.exception))
def testCheckedCelExpression_raises(self):
with self.assertRaises(Exception) as e:
self.env.compile("runtimely + 2", disable_check=False)
self.assertIn("undeclared reference to 'runtimely'", str(e.exception))
def testUncheckedCelExpression(self):
expr: cel.Expression = self.env.compile("runtimely + 2", disable_check=True)
res: cel.Value = expr.eval(self.env.Activation({"runtimely": 40}))
self.assertEqual(res.value(), 42)
def testActivationWithArena(self):
gc.collect()
arena = cel.Arena()
self.assertEqual(cel._InternalArena._get_instance_count(), 1)
msg = test_all_types_pb.TestAllTypes()
msg.single_string = "Hey"
expr = self.env.compile(
"cel.expr.conformance.proto2.TestAllTypes{"
"single_string: var_msg.single_string}"
)
res = expr.eval(self.env.Activation({"var_msg": msg}, arena=arena))
# Clear out reference to `arena` to test garbage collection.
arena = None # pylint: disable=unused-variable
# The arena should still be retained by "res"
gc.collect()
self.assertEqual(cel._InternalArena._get_instance_count(), 1)
# Continue using `res` - the underlying arena is still available
self.assertEqual(res.value().single_string, "Hey")
# `res` was the last thing holding onto `arena`. Clearing it should
# also release the Arena itself
res = None # pylint: disable=unused-variable
gc.collect()
self.assertEqual(cel._InternalArena._get_instance_count(), 0)
def testImplicitActivation(self):
expr: cel.Expression = self.env.compile("'Hello, ' + var_str")
res: cel.Value = expr.eval(data={"var_str": "World!"})
self.assertEqual(res.value(), "Hello, World!")
def testActivationAndOtherArgs(self):
expr: cel.Expression = self.env.compile("'Hello, ' + var_str")
with self.assertRaises(Exception) as e:
expr.eval(
self.env.Activation(data={"var_str": "World!"}),
data={"var_str": "World!"},
)
self.assertIn(
"Cannot provide both activation and any other arguments",
str(e.exception),
)
def testCompilationErrorHandling(self):
# Check parser error.
with self.assertRaises(Exception) as e:
self.env.compile("'Hello,' # 'World!'", disable_check=True)
if self.options.enable_pratt_parser:
self.assertIn(
"1:10: Syntax error: unexpected character\n"
" | 'Hello,' # 'World!'\n"
" | .........^",
str(e.exception),
)
else:
self.assertIn(
"1:10: Syntax error: token recognition error at: '#'\n "
"| 'Hello,' # 'World!'\n "
"| .........^",
str(e.exception),
)
self.assertIn(
"1:12: Syntax error: extraneous input ''World!'' expecting <EOF>\n "
"| 'Hello,' # 'World!'\n "
"| ...........^",
str(e.exception),
)
# Check type-checker error.
with self.assertRaises(Exception) as e:
self.env.compile("'Hello,' - 'World!'")
self.assertIn(
"<input>:1:10: found no matching overload for '_-_' applied to"
" '(string, string)'\n "
"| 'Hello,' - 'World!'\n "
"| .........^",
str(e.exception),
)
def testErrorHandling(self):
bad_env = cel.NewEnv(
_BadDescriptorPool(),
variables={},
options=self.options,
)
with self.assertRaises(Exception) as e:
bad_env.compile("cel.expr.conformance.proto2.TestSomeTypes{}")
self.assertRegex(
str(e.exception),
r"Could not find file containing symbol:.* \[NOT_FOUND\]",
)
def testDescriptorPoolMissingSerializedPb(self):
bad_env = cel.NewEnv(
_MissingSerializedPbPool(),
variables={},
options=self.options,
)
with self.assertRaises(Exception) as e:
bad_env.compile("cel.expr.conformance.proto2.TestSomeTypes{}")
self.assertIn(
"Python file has no attribute 'serialized_pb'",
str(e.exception),
)
def testDescriptorPoolCorruptedSerializedPb(self):
bad_env = cel.NewEnv(
_CorruptedSerializedPbPool(),
variables={},
options=self.options,
)
with self.assertRaises(Exception) as e:
bad_env.compile("cel.expr.conformance.proto2.TestSomeTypes{}")
self.assertIn(
"Failed to parse descriptor for"
" cel.expr.conformance.proto2.TestSomeTypes",
str(e.exception),
)
def testProtoMessageToCelValueError(self):
bad_env = cel.NewEnv(
_RaisingDescriptorPool(),
variables={"var_proto": cel.Type.DYN},
options=self.options,
)
expr = bad_env.compile("var_proto", disable_check=True)
msg = test_all_types_pb.TestAllTypes(single_string="Hey")
res = expr.eval(data={"var_proto": msg})
self.assertEqual(res.type(), cel.Type.ERROR)
self.assertIn("Custom pool error", str(res.value()))
def testValueOutlivesExpression(self):
expr: cel.Expression = self.env.compile("'hello ' + 'world'")
val: cel.Value = expr.eval()
del expr
self.assertEqual(val.value(), "hello world")
expr = self.env.compile("b'hello'")
val = expr.eval()
del expr
self.assertEqual(val.value(), b"hello")
expr = self.env.compile("['a', 'b', 'c']")
val = expr.eval()
del expr
self.assertEqual(val.plain_value(), ["a", "b", "c"])
class CompatibleNumber:
def __init__(self, value: str):
self.value = value
# Defining __index__ makes this a number type from Python's perspective
# and also a valid integer for CEL.
def __index__(self) -> int:
return int(self.value)
class IncompatibleNumber:
def __init__(self, value: str):
self.value = value
# Defining __int__ makes this a number type from Python's perspective,
# but without at least __index__, it won't be a valid integer for CEL.
def __int__(self) -> int:
return len(self.value)
class _BadDescriptorPool:
def FindFileContainingSymbol(self, symbol_name: str): # pylint: disable=invalid-name
if symbol_name.startswith("cel.expr.conformance"):
raise LookupError(
"Could not find file containing symbol: %s" % symbol_name
)
raise KeyError(symbol_name)
class _MissingSerializedPbPool:
def FindFileByName( # pylint: disable=invalid-name,unused-argument
self, filename: str
):
raise KeyError(filename)
def FindFileContainingSymbol( # pylint: disable=invalid-name,unused-argument
self, symbol_name: str
):
if symbol_name.startswith("cel.expr.conformance"):
return object()
raise KeyError(symbol_name)
class _CorruptedSerializedPbPool:
class _FakeFile:
serialized_pb = b"corrupted proto descriptor bytes"
def FindFileContainingSymbol( # pylint: disable=invalid-name,unused-argument
self, symbol_name: str
):
if symbol_name.startswith("cel.expr.conformance"):
return self._FakeFile()
raise KeyError(symbol_name)
class _RaisingDescriptorPool:
def FindFileContainingSymbol(self, symbol_name: str): # pylint: disable=invalid-name
if symbol_name.startswith("cel.expr.conformance"):
raise RuntimeError("Custom pool error: %s" % symbol_name)
raise KeyError(symbol_name)
class CelWithoutProtoSupportTest(absltest.TestCase):
"""Test that the environment can be created without proto support."""
def setUp(self):
super().setUp()
self.msg = test_all_types_pb.TestAllTypes()
self.msg.single_string = "Hey"
# "Unimport" any google.protobuf modules if they are already imported.
for module_name in list(sys.modules):
if module_name.startswith("google.protobuf"):
del sys.modules[module_name]
# Make it impossible to import descriptor_pool.
class UnluckyFinder(importlib.abc.MetaPathFinder):
def find_spec(self, fullname, unused_path, unused_target=None):
if fullname.startswith("google.protobuf."):
raise ImportError("Not found")
return None
sys.meta_path.insert(0, UnluckyFinder())
def tearDown(self):
# Remove the unlucky finder from the meta path.
sys.meta_path.pop(0)
super().tearDown()