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74 lines
3 KiB
Python
74 lines
3 KiB
Python
# Copyright (c) Meta Platforms, Inc. and affiliates.
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# All rights reserved.
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#
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# This source code is licensed under the terms described in the LICENSE file in
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# the root directory of this source tree.
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# Custom Llama Stack Exception classes should follow the following schema
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# 1. All classes should inherit from an existing Built-In Exception class: https://docs.python.org/3/library/exceptions.html
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# 2. All classes should have a custom error message with the goal of informing the Llama Stack user specifically
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# 3. All classes should propogate the inherited __init__ function otherwise via 'super().__init__(message)'
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class ResourceNotFoundError(ValueError):
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"""generic exception for a missing Llama Stack resource"""
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def __init__(self, resource_name: str, resource_type: str, client_list: str) -> None:
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message = (
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f"{resource_type} '{resource_name}' not found. Use '{client_list}' to list available {resource_type}s."
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)
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super().__init__(message)
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class UnsupportedModelError(ValueError):
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"""raised when model is not present in the list of supported models"""
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def __init__(self, model_name: str, supported_models_list: list[str]):
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message = f"'{model_name}' model is not supported. Supported models are: {', '.join(supported_models_list)}"
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super().__init__(message)
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class ModelNotFoundError(ResourceNotFoundError):
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"""raised when Llama Stack cannot find a referenced model"""
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def __init__(self, model_name: str) -> None:
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super().__init__(model_name, "Model", "client.models.list()")
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class VectorStoreNotFoundError(ResourceNotFoundError):
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"""raised when Llama Stack cannot find a referenced vector store"""
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def __init__(self, vector_store_name: str) -> None:
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super().__init__(vector_store_name, "Vector Store", "client.vector_dbs.list()")
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class DatasetNotFoundError(ResourceNotFoundError):
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"""raised when Llama Stack cannot find a referenced dataset"""
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def __init__(self, dataset_name: str) -> None:
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super().__init__(dataset_name, "Dataset", "client.datasets.list()")
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class ToolGroupNotFoundError(ResourceNotFoundError):
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"""raised when Llama Stack cannot find a referenced tool group"""
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def __init__(self, toolgroup_name: str) -> None:
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super().__init__(toolgroup_name, "Tool Group", "client.toolgroups.list()")
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class SessionNotFoundError(ValueError):
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"""raised when Llama Stack cannot find a referenced session or access is denied"""
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def __init__(self, session_name: str) -> None:
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message = f"Session '{session_name}' not found or access denied."
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super().__init__(message)
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class ModelTypeError(TypeError):
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"""raised when a model is present but not the correct type"""
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def __init__(self, model_name: str, model_type: str, expected_model_type: str) -> None:
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message = (
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f"Model '{model_name}' is of type '{model_type}' rather than the expected type '{expected_model_type}'"
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)
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super().__init__(message)
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