move core -> distribution

llama_stack/distribution/utils/dynamic.py

@@ -0,0 +1,66 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# the root directory of this source tree.
+
+import importlib
+from typing import Any, Dict
+
+from llama_stack.distribution.datatypes import *  # noqa: F403
+
+
+def instantiate_class_type(fully_qualified_name):
+    module_name, class_name = fully_qualified_name.rsplit(".", 1)
+    module = importlib.import_module(module_name)
+    return getattr(module, class_name)
+
+
+# returns a class implementing the protocol corresponding to the Api
+async def instantiate_provider(
+    provider_spec: ProviderSpec,
+    deps: Dict[str, Any],
+    provider_config: ProviderMapEntry,
+):
+    module = importlib.import_module(provider_spec.module)
+
+    args = []
+    if isinstance(provider_spec, RemoteProviderSpec):
+        if provider_spec.adapter:
+            method = "get_adapter_impl"
+        else:
+            method = "get_client_impl"
+
+        assert isinstance(provider_config, GenericProviderConfig)
+        config_type = instantiate_class_type(provider_spec.config_class)
+        config = config_type(**provider_config.config)
+        args = [config, deps]
+    elif isinstance(provider_spec, RouterProviderSpec):
+        method = "get_router_impl"
+
+        assert isinstance(provider_config, list)
+        inner_specs = {x.provider_id: x for x in provider_spec.inner_specs}
+        inner_impls = []
+        for routing_entry in provider_config:
+            impl = await instantiate_provider(
+                inner_specs[routing_entry.provider_id],
+                deps,
+                routing_entry,
+            )
+            inner_impls.append((routing_entry.routing_key, impl))
+
+        config = None
+        args = [inner_impls, deps]
+    else:
+        method = "get_provider_impl"
+
+        assert isinstance(provider_config, GenericProviderConfig)
+        config_type = instantiate_class_type(provider_spec.config_class)
+        config = config_type(**provider_config.config)
+        args = [config, deps]
+
+    fn = getattr(module, method)
+    impl = await fn(*args)
+    impl.__provider_spec__ = provider_spec
+    impl.__provider_config__ = config
+    return impl