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59 lines
1.9 KiB
Plaintext
59 lines
1.9 KiB
Plaintext
---
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title: async_utils
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sidebarTitle: async_utils
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---
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# `fastmcp.utilities.async_utils`
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Async utilities for FastMCP.
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## Functions
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### `is_coroutine_function` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/fastmcp_slim/fastmcp/utilities/async_utils.py#L14" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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is_coroutine_function(fn: Any) -> bool
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```
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Check if a callable is a coroutine function, unwrapping functools.partial.
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``inspect.iscoroutinefunction`` returns ``False`` for
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``functools.partial`` objects wrapping an async function on Python < 3.12.
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This helper unwraps any layers of ``partial`` before checking.
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### `call_sync_fn_in_threadpool` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/fastmcp_slim/fastmcp/utilities/async_utils.py#L26" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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call_sync_fn_in_threadpool(fn: Callable[..., Any], *args: Any, **kwargs: Any) -> Any
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```
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Call a sync function in a threadpool to avoid blocking the event loop.
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Uses anyio.to_thread.run_sync which properly propagates contextvars,
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making this safe for functions that depend on context (like dependency injection).
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### `gather` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/fastmcp_slim/fastmcp/utilities/async_utils.py#L51" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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gather(*awaitables: Awaitable[T]) -> list[T] | list[T | BaseException]
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```
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Run awaitables concurrently and return results in order.
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Uses anyio TaskGroup for structured concurrency.
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**Args:**
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- `*awaitables`: Awaitables to run concurrently
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- `return_exceptions`: If True, exceptions are returned in results.
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If False, first exception cancels all and raises.
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**Returns:**
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- List of results in the same order as input awaitables.
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