Fix ignore expired key cb

Dockerfile

@@ -0,0 +1,15 @@
+FROM python:2.7
+
+ENV PYTHONDONTWRITEBYTECODE 1
+ENV PYTHONUNBUFFERED 1
+
+RUN mkdir /app
+
+WORKDIR /app
+
+COPY . /app/
+
+RUN pip install --upgrade pip
+
+RUN pip install -r requirements-dev.txt
+

django_toolkit/fallbacks/circuit_breaker/circuit_breaker.py

@@ -99,7 +99,12 @@ def _increase_failure_count(self):
         # Between the cache.add and cache.incr, the cache MAY expire,
         # which will lead to a circuit that will eventually open
         self.cache.add(self.rule.failure_cache_key, 0, self.failure_timeout)
-        total = self.cache.incr(self.rule.failure_cache_key)
+        total = 0
+        try:
+            total = self.cache.incr(self.rule.failure_cache_key)
+        except ValueError:
+            logger.warning('Key {key} expired!'
+                           .format(key=self.rule.failure_cache_key))
 
         self.rule.log_increase_failures(
             total_failures=total,
@@ -121,7 +126,11 @@ def _increase_request_count(self):
                 self.rule.failure_cache_key, 0, self.failure_timeout
             )
 
-        self.cache.incr(self.rule.request_cache_key)
+        try:
+            self.cache.incr(self.rule.request_cache_key)
+        except ValueError:
+            logger.warning('Key {key} expired!'
+                           .format(key=self.rule.request_cache_key))
 
 
 circuit_breaker = CircuitBreaker

docker-compose.yml

@@ -0,0 +1,8 @@
+version: '3'
+
+services:
+  app:
+    build: .
+    volumes:
+      - .:/app
+    command: "make test"