Add support for normal def functions

fastapi_cache/decorator.py

@@ -1,15 +1,21 @@
-from functools import wraps
-from typing import Callable, Optional, Type
+import asyncio
+from functools import wraps, partial
+import inspect
+from typing import TYPE_CHECKING, Callable, Optional, Type
 
 from fastapi_cache import FastAPICache
 from fastapi_cache.coder import Coder
 
+if TYPE_CHECKING:
+    import concurrent.futures
+
 
 def cache(
     expire: int = None,
     coder: Type[Coder] = None,
     key_builder: Callable = None,
     namespace: Optional[str] = "",
+    executor: Optional["concurrent.futures.Executor"] = None,
 ):
     """
     cache all function
@@ -17,6 +23,8 @@ def cache(
     :param expire:
     :param coder:
     :param key_builder:
+    :param executor:
+
     :return:
     """
 
@@ -63,7 +71,12 @@ def cache(
                     response.headers["ETag"] = etag
                 return coder.decode(ret)
 
-            ret = await func(*args, **kwargs)
+            if inspect.iscoroutinefunction(func):
+                ret = await func(*args, **kwargs)
+            else:
+                loop = asyncio.get_event_loop()
+                ret = await loop.run_in_executor(executor, partial(func, *args, **kwargs))
+
             await backend.set(cache_key, coder.encode(ret), expire or FastAPICache.get_expire())
             return ret