fix(javatarz#12): addition of redis in pipfile, cache duration in arg…

…s instead of having constant

Pipfile

@@ -14,6 +14,7 @@ requests = "*"
 flask = "*"
 flask-jsonpify = "*"
 flask-restful = "*"
+redis = "*"
 
 [requires]
 python_version = "3.7"

ghcl/cache.py

@@ -1,28 +1,24 @@
 import redis
 
-
 def singleton(class_):
     instances = {}
-
     def getinstance(*args, **kwargs):
         if class_ not in instances:
             instances[class_] = class_(*args, **kwargs)
         return instances[class_]
     return getinstance
 
-
 @singleton
 class Cache:
-    CACHE_DURATION_IN_SECONDS = 60
-
-    def __init__(self):
-        self.redis = redis.Redis()
+  def __init__(self, cache_duration=60):
+    self.redis = redis.Redis()
+    self.cache_duration=cache_duration
 
-    def exists(self, cache_key) -> bool:
-        return self.redis.exists(cache_key)
+  def exists(self, cache_key) -> bool:
+      return self.redis.exists(cache_key)
 
-    def set(self, cache_key, value) -> bool:
-        return self.redis.set(cache_key, value, self.CACHE_DURATION_IN_SECONDS)
+  def set(self, cache_key, value) -> bool:
+      return self.redis.set(cache_key, value, self.cache_duration)
 
-    def fetch(self, cache_key) -> str:
-        return self.redis.get(cache_key)
+  def fetch(self, cache_key) -> str:
+      return self.redis.get(cache_key)