mirror of
https://github.com/aljazceru/mcp-python-sdk.git
synced 2025-12-19 23:04:25 +01:00
rename mcp_python to mcp
This commit is contained in:
David Soria Parra
250
src/mcp/server/session.py
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250
src/mcp/server/session.py
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from enum import Enum
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from typing import Any
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import anyio
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import anyio.lowlevel
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from anyio.streams.memory import MemoryObjectReceiveStream, MemoryObjectSendStream
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from pydantic import AnyUrl
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from mcp.server.types import InitializationOptions
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from mcp.shared.session import (
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BaseSession,
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RequestResponder,
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)
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from mcp.types import (
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LATEST_PROTOCOL_VERSION,
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ClientNotification,
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ClientRequest,
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CreateMessageResult,
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EmptyResult,
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Implementation,
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IncludeContext,
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InitializedNotification,
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InitializeRequest,
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InitializeResult,
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JSONRPCMessage,
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ListRootsResult,
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LoggingLevel,
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ModelPreferences,
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PromptListChangedNotification,
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ResourceListChangedNotification,
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SamplingMessage,
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ServerNotification,
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ServerRequest,
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ServerResult,
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ToolListChangedNotification,
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)
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class InitializationState(Enum):
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NotInitialized = 1
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Initializing = 2
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Initialized = 3
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class ServerSession(
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BaseSession[
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ServerRequest,
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ServerNotification,
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ServerResult,
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ClientRequest,
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ClientNotification,
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]
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):
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_initialized: InitializationState = InitializationState.NotInitialized
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def __init__(
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self,
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read_stream: MemoryObjectReceiveStream[JSONRPCMessage | Exception],
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write_stream: MemoryObjectSendStream[JSONRPCMessage],
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init_options: InitializationOptions,
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) -> None:
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super().__init__(read_stream, write_stream, ClientRequest, ClientNotification)
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self._initialization_state = InitializationState.NotInitialized
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self._init_options = init_options
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async def _received_request(
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self, responder: RequestResponder[ClientRequest, ServerResult]
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):
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match responder.request.root:
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case InitializeRequest():
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self._initialization_state = InitializationState.Initializing
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await responder.respond(
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ServerResult(
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InitializeResult(
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protocolVersion=LATEST_PROTOCOL_VERSION,
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capabilities=self._init_options.capabilities,
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serverInfo=Implementation(
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name=self._init_options.server_name,
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version=self._init_options.server_version,
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),
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)
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)
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)
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case _:
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if self._initialization_state != InitializationState.Initialized:
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raise RuntimeError(
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"Received request before initialization was complete"
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)
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async def _received_notification(self, notification: ClientNotification) -> None:
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# Need this to avoid ASYNC910
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await anyio.lowlevel.checkpoint()
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match notification.root:
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case InitializedNotification():
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self._initialization_state = InitializationState.Initialized
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case _:
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if self._initialization_state != InitializationState.Initialized:
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raise RuntimeError(
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"Received notification before initialization was complete"
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)
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async def send_log_message(
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self, level: LoggingLevel, data: Any, logger: str | None = None
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) -> None:
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"""Send a log message notification."""
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from mcp.types import (
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LoggingMessageNotification,
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LoggingMessageNotificationParams,
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)
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await self.send_notification(
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ServerNotification(
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LoggingMessageNotification(
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method="notifications/message",
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params=LoggingMessageNotificationParams(
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level=level,
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data=data,
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logger=logger,
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),
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)
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)
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)
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async def send_resource_updated(self, uri: AnyUrl) -> None:
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"""Send a resource updated notification."""
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from mcp.types import (
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ResourceUpdatedNotification,
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ResourceUpdatedNotificationParams,
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)
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await self.send_notification(
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ServerNotification(
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ResourceUpdatedNotification(
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method="notifications/resources/updated",
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params=ResourceUpdatedNotificationParams(uri=uri),
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)
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)
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)
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async def create_message(
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self,
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messages: list[SamplingMessage],
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*,
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max_tokens: int,
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system_prompt: str | None = None,
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include_context: IncludeContext | None = None,
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temperature: float | None = None,
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stop_sequences: list[str] | None = None,
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metadata: dict[str, Any] | None = None,
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model_preferences: ModelPreferences | None = None,
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) -> CreateMessageResult:
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"""Send a sampling/create_message request."""
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from mcp.types import (
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CreateMessageRequest,
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CreateMessageRequestParams,
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)
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return await self.send_request(
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ServerRequest(
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CreateMessageRequest(
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method="sampling/createMessage",
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params=CreateMessageRequestParams(
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messages=messages,
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systemPrompt=system_prompt,
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includeContext=include_context,
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temperature=temperature,
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maxTokens=max_tokens,
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stopSequences=stop_sequences,
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metadata=metadata,
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modelPreferences=model_preferences,
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),
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)
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),
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CreateMessageResult,
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)
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async def list_roots(self) -> ListRootsResult:
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"""Send a roots/list request."""
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from mcp.types import ListRootsRequest
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return await self.send_request(
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ServerRequest(
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ListRootsRequest(
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method="roots/list",
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)
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),
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ListRootsResult,
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)
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async def send_ping(self) -> EmptyResult:
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"""Send a ping request."""
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from mcp.types import PingRequest
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return await self.send_request(
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ServerRequest(
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PingRequest(
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method="ping",
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)
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),
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EmptyResult,
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)
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async def send_progress_notification(
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self, progress_token: str | int, progress: float, total: float | None = None
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) -> None:
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"""Send a progress notification."""
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from mcp.types import ProgressNotification, ProgressNotificationParams
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await self.send_notification(
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ServerNotification(
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ProgressNotification(
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method="notifications/progress",
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params=ProgressNotificationParams(
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progressToken=progress_token,
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progress=progress,
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total=total,
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),
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)
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)
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)
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async def send_resource_list_changed(self) -> None:
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"""Send a resource list changed notification."""
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await self.send_notification(
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ServerNotification(
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ResourceListChangedNotification(
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method="notifications/resources/list_changed",
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)
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)
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)
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async def send_tool_list_changed(self) -> None:
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"""Send a tool list changed notification."""
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await self.send_notification(
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ServerNotification(
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ToolListChangedNotification(
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method="notifications/tools/list_changed",
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)
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)
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)
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async def send_prompt_list_changed(self) -> None:
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"""Send a prompt list changed notification."""
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await self.send_notification(
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ServerNotification(
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PromptListChangedNotification(
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method="notifications/prompts/list_changed",
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)
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)
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)
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