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refactor: introduce common 'ResourceNotFoundError' exception (#3032)

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# What does this PR do?
1. Introduce new base custom exception class `ResourceNotFoundError`
2. All other "not found" exception classes now inherit from
`ResourceNotFoundError`

Closes #3030

Signed-off-by: Nathan Weinberg <nweinber@redhat.com>
This commit is contained in:
Nathan Weinberg 2025-08-06 13:22:55 -04:00 • committed by GitHub
parent dfce05d0c5
commit e9fced773a
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2 changed files with 33 additions and 16 deletions
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32
llama_stack/apis/common/errors.py
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@ -10,6 +10,16 @@
# 3. All classes should propogate the inherited __init__ function otherwise via 'super().__init__(message)'
class ResourceNotFoundError(ValueError):
"""generic exception for a missing Llama Stack resource"""
def __init__(self, resource_name: str, resource_type: str, client_list: str) -> None:
message = (
f"{resource_type} '{resource_name}' not found. Use '{client_list}' to list available {resource_type}s."
)
super().__init__(message)
class UnsupportedModelError(ValueError):
"""raised when model is not present in the list of supported models"""
@ -18,38 +28,32 @@ class UnsupportedModelError(ValueError):
super().__init__(message)
class ModelNotFoundError(ValueError):
class ModelNotFoundError(ResourceNotFoundError):
"""raised when Llama Stack cannot find a referenced model"""
def __init__(self, model_name: str) -> None:
message = f"Model '{model_name}' not found. Use client.models.list() to list available models."
super().__init__(message)
super().__init__(model_name, "Model", "client.models.list()")
class VectorStoreNotFoundError(ValueError):
class VectorStoreNotFoundError(ResourceNotFoundError):
"""raised when Llama Stack cannot find a referenced vector store"""
def __init__(self, vector_store_name: str) -> None:
message = f"Vector store '{vector_store_name}' not found. Use client.vector_dbs.list() to list available vector stores."
super().__init__(message)
super().__init__(vector_store_name, "Vector Store", "client.vector_dbs.list()")
class DatasetNotFoundError(ValueError):
class DatasetNotFoundError(ResourceNotFoundError):
"""raised when Llama Stack cannot find a referenced dataset"""
def __init__(self, dataset_name: str) -> None:
message = f"Dataset '{dataset_name}' not found. Use client.datasets.list() to list available datasets."
super().__init__(message)
super().__init__(dataset_name, "Dataset", "client.datasets.list()")
class ToolGroupNotFoundError(ValueError):
class ToolGroupNotFoundError(ResourceNotFoundError):
"""raised when Llama Stack cannot find a referenced tool group"""
def __init__(self, toolgroup_name: str) -> None:
message = (
f"Tool group '{toolgroup_name}' not found. Use client.toolgroups.list() to list available tool groups."
)
super().__init__(message)
super().__init__(toolgroup_name, "Tool Group", "client.toolgroups.list()")
class SessionNotFoundError(ValueError):