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Don't block the event loop on non-async functions (#1909)

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Marcelo Trylesinski 2026-01-19 14:47:37 +01:00 • committed by GitHub
commit 1c258ae203
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1 changed files with 5 additions and 4 deletions
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9
src/mcp/server/fastmcp/utilities/func_metadata.py
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@ -1,3 +1,4 @@
import functools
import inspect import inspect
import json import json
from collections.abc import Awaitable, Callable, Sequence from collections.abc import Awaitable, Callable, Sequence
@ -5,6 +6,8 @@ from itertools import chain
from types import GenericAlias from types import GenericAlias
from typing import Annotated, Any, cast, get_args, get_origin, get_type_hints from typing import Annotated, Any, cast, get_args, get_origin, get_type_hints
import anyio
import anyio.to_thread
import pydantic_core import pydantic_core
from pydantic import BaseModel, ConfigDict, Field, WithJsonSchema, create_model from pydantic import BaseModel, ConfigDict, Field, WithJsonSchema, create_model
from pydantic.fields import FieldInfo from pydantic.fields import FieldInfo
@ -53,9 +56,7 @@ class ArgModelBase(BaseModel):
kwargs[output_name] = value kwargs[output_name] = value
return kwargs return kwargs
model_config = ConfigDict( model_config = ConfigDict(arbitrary_types_allowed=True)
arbitrary_types_allowed=True,
)
class FuncMetadata(BaseModel): class FuncMetadata(BaseModel):
@ -85,7 +86,7 @@ class FuncMetadata(BaseModel):
if fn_is_async: if fn_is_async:
return await fn(**arguments_parsed_dict) return await fn(**arguments_parsed_dict)
else: else:
return fn(**arguments_parsed_dict) return await anyio.to_thread.run_sync(functools.partial(fn, **arguments_parsed_dict))
def convert_result(self, result: Any) -> Any: def convert_result(self, result: Any) -> Any:
"""Convert the result of a function call to the appropriate format for """Convert the result of a function call to the appropriate format for