fix(http): use cleaner find type

servc/svc/com/http/__init__.py

@@ -45,7 +45,7 @@ class HTTPInterface(Middleware):
 
     _consumer: Process
 
-    _components: List[type[Middleware]]
+    _components: List[Middleware]
 
     _info: ServiceInformation
 
@@ -57,7 +57,7 @@ def __init__(
         consumerthread: Process,
         resolvers: RESOLVER_MAPPING,
         eventResolvers: RESOLVER_MAPPING,
-        components: List[type[Middleware]],
+        components: List[Middleware],
     ):
         super().__init__(config)
         self._port = int(config.get("port"))

servc/svc/com/http/blob.py

@@ -16,6 +16,7 @@
 from servc.svc.config import Config
 from servc.svc.io.output import ResponseArtifact, StatusCode
 from servc.svc.io.response import getErrorArtifact
+from servc.util import findType
 
 
 def returnError(message: str, error: StatusCode = StatusCode.METHOD_NOT_FOUND):
@@ -35,17 +36,13 @@ def __init__(
         consumerthread: Process,
         resolvers: RESOLVER_MAPPING,
         eventResolvers: RESOLVER_MAPPING,
-        components: List[type[Middleware]],
+        components: List[Middleware],
     ):
         super().__init__(
             config, bus, cache, consumerthread, resolvers, eventResolvers, components
         )
 
-        blobs = [x for x in components if x.name == "blob"]
-        if len(blobs) == 0:
-            raise Exception("Blob storage component not found in components list")
-        self._blobStorage = blobs[0]  # type: ignore[assignment]
-
+        self._blobStorage = findType(components, BlobStorage)
         self._uploadcontainer = config.get("uploadcontainer") or "uploads"
 
     def get_upload_file_path(self, extra_params: Dict, fname: str) -> Tuple[str, str]:

servc/util.py

@@ -0,0 +1,12 @@
+from typing import List, TypeVar
+
+from servc.svc import Middleware
+
+T = TypeVar("T", bound=Middleware)
+
+
+def findType(c: List[Middleware], type: type[T]) -> T:
+    cf = [x for x in c if isinstance(x, type)]
+    if len(cf) == 0:
+        raise ValueError(f"Middleware {type} not found")
+    return cf[0]