feat(tvix/store/pathinfosvc): GRPCPathInfoService::from_client

Change-Id: I4a4f6f713dd76bf95f393c094c0eb9b6d15c5436
Reviewed-on: https://cl.tvl.fyi/c/depot/+/8613
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
Autosubmit: flokli <flokli@flokli.de>

tvix/store/src/pathinfoservice/grpc.rs

@@ -25,6 +25,17 @@ impl GRPCPathInfoService {
             grpc_client,
         }
     }
+
+    /// construct a [GRPCDirectoryService] from a [proto::path_info_service_client::PathInfoServiceClient<Channel>].
+    /// panics if called outside the context of a tokio runtime.
+    pub fn from_client(
+        grpc_client: proto::path_info_service_client::PathInfoServiceClient<Channel>,
+    ) -> Self {
+        Self {
+            tokio_handle: tokio::runtime::Handle::current(),
+            grpc_client,
+        }
+    }
 }
 
 impl PathInfoService for GRPCPathInfoService {