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https://github.com/meta-llama/llama-stack.git
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9e6561a1ec
# What does this PR do? The goal of this PR is code base modernization. Schema reflection code needed a minor adjustment to handle UnionTypes and collections.abc.AsyncIterator. (Both are preferred for latest Python releases.) Note to reviewers: almost all changes here are automatically generated by pyupgrade. Some additional unused imports were cleaned up. The only change worth of note can be found under `docs/openapi_generator` and `llama_stack/strong_typing/schema.py` where reflection code was updated to deal with "newer" types. Signed-off-by: Ihar Hrachyshka <ihar.hrachyshka@gmail.com>
43 lines
1.5 KiB
Python
43 lines
1.5 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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from collections.abc import AsyncGenerator
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from contextvars import ContextVar
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from typing import TypeVar
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T = TypeVar("T")
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def preserve_contexts_async_generator(
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gen: AsyncGenerator[T, None], context_vars: list[ContextVar]
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) -> AsyncGenerator[T, None]:
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"""
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Wraps an async generator to preserve context variables across iterations.
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This is needed because we start a new asyncio event loop for each streaming request,
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and we need to preserve the context across the event loop boundary.
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"""
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# Capture initial context values
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initial_context_values = {context_var.name: context_var.get() for context_var in context_vars}
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async def wrapper() -> AsyncGenerator[T, None]:
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while True:
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try:
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# Restore context values before any await
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for context_var in context_vars:
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context_var.set(initial_context_values[context_var.name])
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item = await gen.__anext__()
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# Update our tracked values with any changes made during this iteration
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for context_var in context_vars:
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initial_context_values[context_var.name] = context_var.get()
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yield item
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except StopAsyncIteration:
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break
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return wrapper()
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