fix: handle __call__ on clients

src/_bentoml_impl/client/base.py

@@ -27,6 +27,9 @@ class AbstractClient(abc.ABC):
 
     def __init__(self) -> None:
         for name in self.endpoints:
+            if name == "__call__":
+                # __call__ must be set on the class
+                continue
             attr_name = name
             if getattr(self, attr_name, None) is not None:
                 attr_name = f"api_{name}"  # prefix to avoid name conflict
@@ -49,3 +52,8 @@ def call(self, __name: str, /, *args: t.Any, **kwargs: t.Any) -> t.Any:
         """Call a service method by its name.
         It takes the same arguments as the service method.
         """
+
+    def __call__(self, *args: t.Any, **kwargs: t.Any) -> t.Any:
+        if "__call__" not in self.endpoints:
+            raise TypeError("This service is not callable.")
+        return self.call("__call__", *args, **kwargs)

src/_bentoml_sdk/service/factory.py

@@ -419,14 +419,21 @@ def __init__(self) -> None:
 
 class _AsyncWrapper:
     def __init__(self, wrapped: t.Any, apis: t.Iterable[str]) -> None:
+        self.__call = None
         for name in apis:
-            setattr(self, name, self.__make_method(wrapped, name))
+            if name == "__call__":
+                self.__call = self.__make_method(wrapped, name)
+            else:
+                setattr(self, name, self.__make_method(wrapped, name))
+
+    def __call__(self, *args: t.Any, **kwargs: t.Any) -> t.Any:
+        if self.__call is None:
+            raise TypeError("This service is not callable.")
+        return self.__call(*args, **kwargs)
 
     def __make_method(self, inner: t.Any, name: str) -> t.Any:
         import asyncio
-        import subprocess
 
-        subprocess.Popen
         import anyio.to_thread
 
         original_func = func = getattr(inner, name)