cpython/Lib/json/tests/test_recursion.py

107 lines
3.1 KiB
Python

from unittest import TestCase
import json
class JSONTestObject:
pass
class RecursiveJSONEncoder(json.JSONEncoder):
recurse = False
def default(self, o):
if o is JSONTestObject:
if self.recurse:
return [JSONTestObject]
else:
return 'JSONTestObject'
return json.JSONEncoder.default(o)
class EndlessJSONEncoder(json.JSONEncoder):
def default(self, o):
"""If check_circular is False, this will keep adding another list."""
return [o]
class TestRecursion(TestCase):
def test_listrecursion(self):
x = []
x.append(x)
try:
json.dumps(x)
except ValueError:
pass
else:
self.fail("didn't raise ValueError on list recursion")
x = []
y = [x]
x.append(y)
try:
json.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
json.dumps(x)
def test_dictrecursion(self):
x = {}
x["test"] = x
try:
json.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
json.dumps(x)
def test_defaultrecursion(self):
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
# str
with self.assertRaises(RuntimeError):
json.loads('{"a":' * 100000 + '1' + '}' * 100000)
with self.assertRaises(RuntimeError):
json.loads('{"a":' * 100000 + '[1]' + '}' * 100000)
with self.assertRaises(RuntimeError):
json.loads('[' * 100000 + '1' + ']' * 100000)
# unicode
with self.assertRaises(RuntimeError):
json.loads(u'{"a":' * 100000 + u'1' + u'}' * 100000)
with self.assertRaises(RuntimeError):
json.loads(u'{"a":' * 100000 + u'[1]' + u'}' * 100000)
with self.assertRaises(RuntimeError):
json.loads(u'[' * 100000 + u'1' + u']' * 100000)
def test_highly_nested_objects_encoding(self):
# See #12051
l, d = [], {}
for x in xrange(100000):
l, d = [l], {'k':d}
with self.assertRaises(RuntimeError):
json.dumps(l)
with self.assertRaises(RuntimeError):
json.dumps(d)
def test_endless_recursion(self):
# See #12051
with self.assertRaises(RuntimeError):
EndlessJSONEncoder(check_circular=False).encode(5j)