59 lines
1.7 KiB
Python
59 lines
1.7 KiB
Python
from collections.abc import Generator
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from contextlib import contextmanager
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from dataclasses import dataclass, field
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from typing import Generic
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from pydantic import BaseModel
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from mcp.shared.context import LifespanContextT, RequestContext
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from mcp.shared.session import (
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BaseSession,
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ReceiveNotificationT,
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ReceiveRequestT,
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SendNotificationT,
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SendRequestT,
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SendResultT,
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)
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from mcp.types import ProgressToken
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class Progress(BaseModel):
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progress: float
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total: float | None
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@dataclass
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class ProgressContext(Generic[SendRequestT, SendNotificationT, SendResultT, ReceiveRequestT, ReceiveNotificationT]):
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session: BaseSession[SendRequestT, SendNotificationT, SendResultT, ReceiveRequestT, ReceiveNotificationT]
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progress_token: ProgressToken
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total: float | None
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current: float = field(default=0.0, init=False)
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async def progress(self, amount: float, message: str | None = None) -> None:
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self.current += amount
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await self.session.send_progress_notification(
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self.progress_token, self.current, total=self.total, message=message
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)
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@contextmanager
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def progress(
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ctx: RequestContext[
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BaseSession[SendRequestT, SendNotificationT, SendResultT, ReceiveRequestT, ReceiveNotificationT],
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LifespanContextT,
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],
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total: float | None = None,
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) -> Generator[
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ProgressContext[SendRequestT, SendNotificationT, SendResultT, ReceiveRequestT, ReceiveNotificationT],
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None,
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]:
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if ctx.meta is None or ctx.meta.progressToken is None: # pragma: no cover
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raise ValueError("No progress token provided")
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progress_ctx = ProgressContext(ctx.session, ctx.meta.progressToken, total)
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try:
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yield progress_ctx
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finally:
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pass
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