Add default config when init

update JsonEncoder

fastapi_cache/coder.py

@@ -1,7 +1,40 @@
+import datetime
 import json
 import pickle  # nosec:B403
+from decimal import Decimal
 from typing import Any
 
+import dateutil.parser
+
+CONVERTERS = {
+    "date": dateutil.parser.parse,
+    "datetime": dateutil.parser.parse,
+    "decimal": Decimal,
+}
+
+
+class JsonEncoder(json.JSONEncoder):
+    def default(self, obj):
+        if isinstance(obj, datetime.datetime):
+            return {"val": obj.strftime("%Y-%m-%d %H:%M:%S"), "_spec_type": "datetime"}
+        elif isinstance(obj, datetime.date):
+            return {"val": obj.strftime("%Y-%m-%d"), "_spec_type": "date"}
+        elif isinstance(obj, Decimal):
+            return {"val": str(obj), "_spec_type": "decimal"}
+        else:
+            return super().default(obj)
+
+
+def object_hook(obj):
+    _spec_type = obj.get("_spec_type")
+    if not _spec_type:
+        return obj
+
+    if _spec_type in CONVERTERS:
+        return CONVERTERS[_spec_type](obj["val"])
+    else:
+        raise TypeError("Unknown {}".format(_spec_type))
+
 
 class Coder:
     @classmethod
@@ -16,11 +49,11 @@ class Coder:
 class JsonCoder(Coder):
     @classmethod
     def encode(cls, value: Any):
-        return json.dumps(value)
+        return json.dumps(value, cls=JsonEncoder)
 
     @classmethod
     def decode(cls, value: Any):
-        return json.loads(value)
+        return json.loads(value, object_hook=object_hook)
 
 
 class PickleCoder(Coder):