mirror of
https://github.com/meta-llama/llama-stack.git
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86 lines
2.6 KiB
Python
86 lines
2.6 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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import contextvars
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import json
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import logging
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from typing import Any, ContextManager, Dict, Optional
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from .utils.dynamic import instantiate_class_type
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log = logging.getLogger(__name__)
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# Context variable for request provider data
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_provider_data_var = contextvars.ContextVar("provider_data", default=None)
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class RequestProviderDataContext(ContextManager):
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"""Context manager for request provider data"""
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def __init__(self, provider_data: Optional[Dict[str, Any]] = None):
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self.provider_data = provider_data
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self.token = None
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def __enter__(self):
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# Save the current value and set the new one
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self.token = _provider_data_var.set(self.provider_data)
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return self
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def __exit__(self, exc_type, exc_val, exc_tb):
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# Restore the previous value
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if self.token is not None:
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_provider_data_var.reset(self.token)
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class NeedsRequestProviderData:
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def get_request_provider_data(self) -> Any:
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spec = self.__provider_spec__
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assert spec, f"Provider spec not set on {self.__class__}"
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provider_type = spec.provider_type
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validator_class = spec.provider_data_validator
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if not validator_class:
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raise ValueError(f"Provider {provider_type} does not have a validator")
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val = _provider_data_var.get()
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if not val:
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return None
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validator = instantiate_class_type(validator_class)
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try:
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provider_data = validator(**val)
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return provider_data
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except Exception as e:
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log.error(f"Error parsing provider data: {e}")
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return None
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def parse_request_provider_data(headers: Dict[str, str]) -> Optional[Dict[str, Any]]:
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"""Parse provider data from request headers"""
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keys = [
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"X-LlamaStack-Provider-Data",
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"x-llamastack-provider-data",
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]
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val = None
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for key in keys:
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val = headers.get(key, None)
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if val:
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break
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if not val:
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return None
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try:
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return json.loads(val)
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except json.JSONDecodeError:
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log.error("Provider data not encoded as a JSON object!")
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return None
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def request_provider_data_context(headers: Dict[str, str]) -> ContextManager:
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"""Context manager that sets request provider data from headers for the duration of the context"""
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provider_data = parse_request_provider_data(headers)
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return RequestProviderDataContext(provider_data)
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