django-rest-framework/djangorestframework/tests/throttling.py

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"""
Tests for the throttling implementations in the permissions module.
"""
from django.test import TestCase
from django.contrib.auth.models import User
from django.core.cache import cache
from djangorestframework.compat import RequestFactory
from djangorestframework.views import View
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from djangorestframework.permissions import PerUserThrottling, PerViewThrottling, PerResourceThrottling
from djangorestframework.resources import FormResource
from djangorestframework.response import Response
class MockView(View):
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permissions = ( PerUserThrottling, )
throttle = '3/sec'
def get(self, request):
return Response('foo')
class MockView_PerViewThrottling(MockView):
permissions = ( PerViewThrottling, )
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class MockView_PerResourceThrottling(MockView):
permissions = ( PerResourceThrottling, )
resource = FormResource
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class MockView_MinuteThrottling(MockView):
throttle = '3/min'
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class ThrottlingTests(TestCase):
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urls = 'djangorestframework.tests.throttling'
def setUp(self):
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"""
Reset the cache so that no throttles will be active
"""
cache.clear()
self.factory = RequestFactory()
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def test_requests_are_throttled(self):
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"""
Ensure request rate is limited
"""
request = self.factory.get('/')
for dummy in range(4):
response = MockView.as_view()(request)
self.assertEqual(503, response.status_code)
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def set_throttle_timer(self, view, value):
"""
Explicitly set the timer, overriding time.time()
"""
view.permissions[0].timer = lambda self: value
def test_request_throttling_expires(self):
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"""
Ensure request rate is limited for a limited duration only
"""
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self.set_throttle_timer(MockView, 0)
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request = self.factory.get('/')
for dummy in range(4):
response = MockView.as_view()(request)
self.assertEqual(503, response.status_code)
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# Advance the timer by one second
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self.set_throttle_timer(MockView, 1)
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response = MockView.as_view()(request)
self.assertEqual(200, response.status_code)
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def ensure_is_throttled(self, view, expect):
request = self.factory.get('/')
request.user = User.objects.create(username='a')
for dummy in range(3):
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view.as_view()(request)
request.user = User.objects.create(username='b')
response = view.as_view()(request)
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self.assertEqual(expect, response.status_code)
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def test_request_throttling_is_per_user(self):
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"""
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Ensure request rate is only limited per user, not globally for
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PerUserThrottles
"""
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self.ensure_is_throttled(MockView, 200)
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def test_request_throttling_is_per_view(self):
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"""
Ensure request rate is limited globally per View for PerViewThrottles
"""
self.ensure_is_throttled(MockView_PerViewThrottling, 503)
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def test_request_throttling_is_per_resource(self):
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"""
Ensure request rate is limited globally per Resource for PerResourceThrottles
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"""
self.ensure_is_throttled(MockView_PerResourceThrottling, 503)
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def ensure_response_header_contains_proper_throttle_field(self, view, expected_headers):
"""
Ensure the response returns an X-Throttle field with status and next attributes
set properly.
"""
request = self.factory.get('/')
for timer, expect in expected_headers:
self.set_throttle_timer(view, timer)
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response = view.as_view()(request)
self.assertEquals(response['X-Throttle'], expect)
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def test_seconds_fields(self):
"""
Ensure for second based throttles.
"""
self.ensure_response_header_contains_proper_throttle_field(MockView,
((0, 'status=SUCCESS; next=0.33 sec'),
(0, 'status=SUCCESS; next=0.50 sec'),
(0, 'status=SUCCESS; next=1.00 sec'),
(0, 'status=FAILURE; next=1.00 sec')
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))
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def test_minutes_fields(self):
"""
Ensure for minute based throttles.
"""
self.ensure_response_header_contains_proper_throttle_field(MockView_MinuteThrottling,
((0, 'status=SUCCESS; next=20.00 sec'),
(0, 'status=SUCCESS; next=30.00 sec'),
(0, 'status=SUCCESS; next=60.00 sec'),
(0, 'status=FAILURE; next=60.00 sec')
))
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def test_next_rate_remains_constant_if_followed(self):
"""
If a client follows the recommended next request rate,
the throttling rate should stay constant.
"""
self.ensure_response_header_contains_proper_throttle_field(MockView_MinuteThrottling,
((0, 'status=SUCCESS; next=20.00 sec'),
(20, 'status=SUCCESS; next=20.00 sec'),
(40, 'status=SUCCESS; next=20.00 sec'),
(60, 'status=SUCCESS; next=20.00 sec'),
(80, 'status=SUCCESS; next=20.00 sec')
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))