fix cache

utils/tests.py

@@ -0,0 +1,50 @@
+from types import SimpleNamespace
+from unittest import TestCase
+
+from django.conf import settings
+
+if not settings.configured:
+    settings.configure(
+        DJANGO_REDIS_CONNECTION_FACTORY="django_redis.pool.ConnectionFactory",
+    )
+
+from utils.cache import MyRedisClient
+from utils.throttling import TokenBucket
+
+
+class FakeRedis:
+    def __init__(self):
+        self.hashes = {}
+
+    def hset(self, name, key, value):
+        self.hashes.setdefault(str(name), {})[str(key)] = value
+        return 1
+
+    def hget(self, name, key):
+        return self.hashes.get(str(name), {}).get(str(key))
+
+
+def make_client():
+    backend = SimpleNamespace(
+        key_prefix="",
+        version=1,
+        key_func=lambda key, key_prefix, version: key,
+    )
+    client = MyRedisClient("redis://localhost:6379/0", {}, backend)
+    fake_redis = FakeRedis()
+    client.get_client = lambda write=True: fake_redis
+    return client
+
+
+class TokenBucketCacheTests(TestCase):
+    def test_token_bucket_reads_values_written_through_django_redis_hash_api(self):
+        bucket = TokenBucket(
+            key="submission:user:1",
+            capacity=2,
+            fill_rate=0.1,
+            default_capacity=2,
+            redis_conn=make_client(),
+        )
+
+        self.assertEqual(bucket.consume(), (True, 0))
+        self.assertEqual(bucket.consume(), (True, 0))