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fix(models)!: always prefix models with provider_id when registering (#3822)

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**!!BREAKING CHANGE!!**

The lookup is also straightforward -- we always look for this identifier
and don't try to find a match for something without the provider_id
prefix.

Note that, this ideally means we need to update the `register_model()`
API also (we should kill "identifier" from there) but I am not doing
that as part of this PR.

## Test Plan

Existing unit tests
This commit is contained in:
Ashwin Bharambe 2025-10-16 06:47:39 -07:00 • committed by GitHub
parent f205ab6f6c
commit f70aa99c97
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10 changed files with 53 additions and 124 deletions
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22
llama_stack/core/routing_tables/common.py
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@ -245,25 +245,7 @@ class CommonRoutingTableImpl(RoutingTable):
async def lookup_model(routing_table: CommonRoutingTableImpl, model_id: str) -> Model:
# first try to get the model by identifier
# this works if model_id is an alias or is of the form provider_id/provider_model_id
model = await routing_table.get_object_by_identifier("model", model_id)
if model is not None:
return model
logger.warning(
f"WARNING: model identifier '{model_id}' not found in routing table. Falling back to "
"searching in all providers. This is only for backwards compatibility and will stop working "
"soon. Migrate your calls to use fully scoped `provider_id/model_id` names."
)
# if not found, this means model_id is an unscoped provider_model_id, we need
# to iterate (given a lack of an efficient index on the KVStore)
models = await routing_table.get_all_with_type("model")
matching_models = [m for m in models if m.provider_resource_id == model_id]
if len(matching_models) == 0:
if not model:
raise ModelNotFoundError(model_id)
if len(matching_models) > 1:
raise ValueError(f"Multiple providers found for '{model_id}': {[m.provider_id for m in matching_models]}")
return matching_models[0]
return model

12
llama_stack/core/routing_tables/models.py
View file

@ -33,7 +33,7 @@ class ModelsRoutingTable(CommonRoutingTableImpl, Models):
try:
models = await provider.list_models()
except Exception as e:
logger.debug(f"Model refresh failed for provider {provider_id}: {e}")
logger.warning(f"Model refresh failed for provider {provider_id}: {e}")
continue
self.listed_providers.add(provider_id)
@ -104,15 +104,7 @@ class ModelsRoutingTable(CommonRoutingTableImpl, Models):
if "embedding_dimension" not in metadata and model_type == ModelType.embedding:
raise ValueError("Embedding model must have an embedding dimension in its metadata")
# an identifier different than provider_model_id implies it is an alias, so that
# becomes the globally unique identifier. otherwise provider_model_ids can conflict,
# so as a general rule we must use the provider_id to disambiguate.
if model_id != provider_model_id:
identifier = model_id
else:
identifier = f"{provider_id}/{provider_model_id}"
identifier = f"{provider_id}/{provider_model_id}"
model = ModelWithOwner(
identifier=identifier,
provider_resource_id=provider_model_id,