[Enhance][Bug fix] Improve setting file & ...

- Fix a small bug that `best30` of API cannot have scores whose songs are not in database
- At present the setting file can be a module or a file with some of options
- Limiter can have multiple rules together now

latest version/core/limiter.py

@@ -1,4 +1,4 @@
-from limits import parse, strategies
+from limits import parse_many, strategies
 from limits.storage import storage_from_string
 
 
@@ -6,23 +6,26 @@ class ArcLimiter:
     storage = storage_from_string("memory://")
     strategy = strategies.FixedWindowRateLimiter(storage)
 
-    def __init__(self, limit: str = None, namespace: str = None):
-        self._limit = None
-        self.limit = limit
+    def __init__(self, limit_str: str = None, namespace: str = None):
+        self._limits = None
+        self.limits = limit_str
         self.namespace = namespace
 
     @property
-    def limit(self):
-        return self._limit
+    def limits(self):
+        return self._limits
 
-    @limit.setter
-    def limit(self, value):
+    @limits.setter
+    def limits(self, value: str):
         if value is None:
             return
-        self._limit = parse(value)
+        self._limits = parse_many(value)
 
     def hit(self, key: str, cost: int = 1) -> bool:
-        return self.strategy.hit(self.limit, self.namespace, key, cost=cost)
+        flag = True
+        for limit in self.limits:
+            flag &= self.strategy.hit(limit, self.namespace, key, cost)
+        return flag
 
     def test(self, key: str) -> bool:
-        return self.strategy.test(self.limit, self.namespace, key)
+        return all(self.strategy.test(limit, self.namespace, key) for limit in self.limits)