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from test import support
from test.test_json import PyTest, CTest
class JSONTestObject:
pass
class TestRecursion:
def test_listrecursion(self):
x = []
x.append(x)
try:
self.dumps(x)
except ValueError:
pass
else:
self.fail("didn't raise ValueError on list recursion")
x = []
y = [x]
x.append(y)
try:
self.dumps(x)
except ValueError:
pass
else:
self.fail("didn't raise ValueError on alternating list recursion")
y = []
x = [y, y]
# ensure that the marker is cleared
self.dumps(x)
def test_dictrecursion(self):
x = {}
x["test"] = x
try:
self.dumps(x)
except ValueError:
pass
else:
self.fail("didn't raise ValueError on dict recursion")
x = {}
y = {"a": x, "b": x}
# ensure that the marker is cleared
self.dumps(x)
def test_defaultrecursion(self):
class RecursiveJSONEncoder(self.json.JSONEncoder):
recurse = False
def default(self, o):
if o is JSONTestObject:
if self.recurse:
return [JSONTestObject]
else:
return 'JSONTestObject'
return self.json.JSONEncoder.default(o)
enc = RecursiveJSONEncoder()
self.assertEqual(enc.encode(JSONTestObject), '"JSONTestObject"')
enc.recurse = True
try:
enc.encode(JSONTestObject)
except ValueError:
pass
else:
self.fail("didn't raise ValueError on default recursion")
def test_highly_nested_objects_decoding(self):
# test that loading highly-nested objects doesn't segfault when C
# accelerations are used. See #12017
with self.assertRaises(RecursionError):
with support.infinite_recursion():
self.loads('{"a":' * 100000 + '1' + '}' * 100000)
with self.assertRaises(RecursionError):
with support.infinite_recursion():
self.loads('{"a":' * 100000 + '[1]' + '}' * 100000)
with self.assertRaises(RecursionError):
with support.infinite_recursion():
self.loads('[' * 100000 + '1' + ']' * 100000)
@support.requires_resource('cpu')
def test_highly_nested_objects_encoding(self):
# See #12051
l, d = [], {}
for x in range(100000):
l, d = [l], {'k':d}
with self.assertRaises(RecursionError):
with support.infinite_recursion(5000):
self.dumps(l)
with self.assertRaises(RecursionError):
with support.infinite_recursion(5000):
self.dumps(d)
def test_endless_recursion(self):
# See #12051
class EndlessJSONEncoder(self.json.JSONEncoder):
def default(self, o):
"""If check_circular is False, this will keep adding another list."""
return [o]
with self.assertRaises(RecursionError):
with support.infinite_recursion(1000):
EndlessJSONEncoder(check_circular=False).encode(5j)
class TestPyRecursion(TestRecursion, PyTest): pass
class TestCRecursion(TestRecursion, CTest): pass
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