637 lines
26 KiB
Python
637 lines
26 KiB
Python
"""MCP Server Module
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This module provides a framework for creating an MCP (Model Context Protocol) server.
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It allows you to easily define and handle various types of requests and notifications
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using constructor-based handler registration.
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Usage:
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1. Define handler functions:
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async def my_list_tools(ctx, params):
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return types.ListToolsResult(tools=[...])
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async def my_call_tool(ctx, params):
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return types.CallToolResult(content=[...])
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2. Create a Server instance with on_* handlers:
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server = Server(
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"your_server_name",
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on_list_tools=my_list_tools,
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on_call_tool=my_call_tool,
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)
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3. Run the server:
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async def main():
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async with mcp.server.stdio.stdio_server() as (read_stream, write_stream):
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await server.run(
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read_stream,
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write_stream,
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server.create_initialization_options(),
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)
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asyncio.run(main())
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The Server class dispatches incoming requests and notifications to registered
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handler callables by method string.
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"""
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from __future__ import annotations
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import contextvars
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import logging
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import warnings
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from collections.abc import AsyncIterator, Awaitable, Callable
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from contextlib import AbstractAsyncContextManager, AsyncExitStack, asynccontextmanager
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from importlib.metadata import version as importlib_version
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from typing import Any, Generic
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import anyio
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from anyio.streams.memory import MemoryObjectReceiveStream, MemoryObjectSendStream
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from starlette.applications import Starlette
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from starlette.middleware import Middleware
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from starlette.middleware.authentication import AuthenticationMiddleware
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from starlette.routing import Mount, Route
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from typing_extensions import TypeVar
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from mcp import types
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from mcp.server.auth.middleware.auth_context import AuthContextMiddleware
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from mcp.server.auth.middleware.bearer_auth import BearerAuthBackend, RequireAuthMiddleware
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from mcp.server.auth.provider import OAuthAuthorizationServerProvider, TokenVerifier
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from mcp.server.auth.routes import build_resource_metadata_url, create_auth_routes, create_protected_resource_routes
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from mcp.server.auth.settings import AuthSettings
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from mcp.server.context import ServerRequestContext
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from mcp.server.experimental.request_context import Experimental
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from mcp.server.lowlevel.experimental import ExperimentalHandlers
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from mcp.server.models import InitializationOptions
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from mcp.server.session import ServerSession
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from mcp.server.streamable_http import EventStore
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from mcp.server.streamable_http_manager import StreamableHTTPASGIApp, StreamableHTTPSessionManager
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from mcp.server.transport_security import TransportSecuritySettings
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from mcp.shared.exceptions import MCPError
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from mcp.shared.message import ServerMessageMetadata, SessionMessage
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from mcp.shared.session import RequestResponder
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logger = logging.getLogger(__name__)
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LifespanResultT = TypeVar("LifespanResultT", default=Any)
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request_ctx: contextvars.ContextVar[ServerRequestContext[Any]] = contextvars.ContextVar("request_ctx")
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class NotificationOptions:
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def __init__(self, prompts_changed: bool = False, resources_changed: bool = False, tools_changed: bool = False):
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self.prompts_changed = prompts_changed
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self.resources_changed = resources_changed
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self.tools_changed = tools_changed
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@asynccontextmanager
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async def lifespan(_: Server[LifespanResultT]) -> AsyncIterator[dict[str, Any]]:
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"""Default lifespan context manager that does nothing.
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Args:
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server: The server instance this lifespan is managing
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Returns:
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An empty context object
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"""
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yield {}
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async def _ping_handler(ctx: ServerRequestContext[Any], params: types.RequestParams | None) -> types.EmptyResult:
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return types.EmptyResult()
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class Server(Generic[LifespanResultT]):
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def __init__(
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self,
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name: str,
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*,
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version: str | None = None,
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title: str | None = None,
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description: str | None = None,
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instructions: str | None = None,
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website_url: str | None = None,
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icons: list[types.Icon] | None = None,
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lifespan: Callable[
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[Server[LifespanResultT]],
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AbstractAsyncContextManager[LifespanResultT],
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] = lifespan,
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# Request handlers
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on_list_tools: Callable[
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[ServerRequestContext[LifespanResultT], types.PaginatedRequestParams | None],
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Awaitable[types.ListToolsResult],
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]
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| None = None,
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on_call_tool: Callable[
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[ServerRequestContext[LifespanResultT], types.CallToolRequestParams],
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Awaitable[types.CallToolResult | types.CreateTaskResult],
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]
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| None = None,
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on_list_resources: Callable[
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[ServerRequestContext[LifespanResultT], types.PaginatedRequestParams | None],
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Awaitable[types.ListResourcesResult],
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]
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| None = None,
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on_list_resource_templates: Callable[
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[ServerRequestContext[LifespanResultT], types.PaginatedRequestParams | None],
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Awaitable[types.ListResourceTemplatesResult],
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]
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| None = None,
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on_read_resource: Callable[
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[ServerRequestContext[LifespanResultT], types.ReadResourceRequestParams],
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Awaitable[types.ReadResourceResult],
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]
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| None = None,
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on_subscribe_resource: Callable[
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[ServerRequestContext[LifespanResultT], types.SubscribeRequestParams],
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Awaitable[types.EmptyResult],
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]
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| None = None,
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on_unsubscribe_resource: Callable[
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[ServerRequestContext[LifespanResultT], types.UnsubscribeRequestParams],
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Awaitable[types.EmptyResult],
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]
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| None = None,
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on_list_prompts: Callable[
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[ServerRequestContext[LifespanResultT], types.PaginatedRequestParams | None],
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Awaitable[types.ListPromptsResult],
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]
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| None = None,
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on_get_prompt: Callable[
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[ServerRequestContext[LifespanResultT], types.GetPromptRequestParams],
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Awaitable[types.GetPromptResult],
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]
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| None = None,
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on_completion: Callable[
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[ServerRequestContext[LifespanResultT], types.CompleteRequestParams],
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Awaitable[types.CompleteResult],
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]
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| None = None,
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on_set_logging_level: Callable[
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[ServerRequestContext[LifespanResultT], types.SetLevelRequestParams],
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Awaitable[types.EmptyResult],
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]
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| None = None,
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on_ping: Callable[
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[ServerRequestContext[LifespanResultT], types.RequestParams | None],
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Awaitable[types.EmptyResult],
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] = _ping_handler,
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# Notification handlers
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on_roots_list_changed: Callable[
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[ServerRequestContext[LifespanResultT], types.NotificationParams | None],
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Awaitable[None],
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]
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| None = None,
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on_progress: Callable[
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[ServerRequestContext[LifespanResultT], types.ProgressNotificationParams],
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Awaitable[None],
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]
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| None = None,
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):
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self.name = name
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self.version = version
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self.title = title
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self.description = description
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self.instructions = instructions
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self.website_url = website_url
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self.icons = icons
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self.lifespan = lifespan
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self._request_handlers: dict[str, Callable[[ServerRequestContext[LifespanResultT], Any], Awaitable[Any]]] = {}
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self._notification_handlers: dict[
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str, Callable[[ServerRequestContext[LifespanResultT], Any], Awaitable[None]]
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] = {}
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self._experimental_handlers: ExperimentalHandlers[LifespanResultT] | None = None
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self._session_manager: StreamableHTTPSessionManager | None = None
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logger.debug("Initializing server %r", name)
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# Populate internal handler dicts from on_* kwargs
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self._request_handlers.update(
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{
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method: handler
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for method, handler in {
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"ping": on_ping,
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"prompts/list": on_list_prompts,
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"prompts/get": on_get_prompt,
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"resources/list": on_list_resources,
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"resources/templates/list": on_list_resource_templates,
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"resources/read": on_read_resource,
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"resources/subscribe": on_subscribe_resource,
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"resources/unsubscribe": on_unsubscribe_resource,
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"tools/list": on_list_tools,
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"tools/call": on_call_tool,
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"logging/setLevel": on_set_logging_level,
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"completion/complete": on_completion,
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}.items()
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if handler is not None
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}
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)
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self._notification_handlers.update(
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{
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method: handler
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for method, handler in {
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"notifications/roots/list_changed": on_roots_list_changed,
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"notifications/progress": on_progress,
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}.items()
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if handler is not None
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}
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)
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def _add_request_handler(
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self,
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method: str,
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handler: Callable[[ServerRequestContext[LifespanResultT], Any], Awaitable[Any]],
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) -> None:
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"""Add a request handler, silently replacing any existing handler for the same method."""
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self._request_handlers[method] = handler
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def _has_handler(self, method: str) -> bool:
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"""Check if a handler is registered for the given method."""
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return method in self._request_handlers or method in self._notification_handlers
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# TODO: Rethink capabilities API. Currently capabilities are derived from registered
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# handlers but require NotificationOptions to be passed externally for list_changed
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# flags, and experimental_capabilities as a separate dict. Consider deriving capabilities
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# entirely from server state (e.g. constructor params for list_changed) instead of
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# requiring callers to assemble them at create_initialization_options() time.
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def create_initialization_options(
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self,
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notification_options: NotificationOptions | None = None,
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experimental_capabilities: dict[str, dict[str, Any]] | None = None,
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) -> InitializationOptions:
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"""Create initialization options from this server instance."""
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def pkg_version(package: str) -> str:
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try:
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return importlib_version(package)
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except Exception: # pragma: no cover
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pass
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return "unknown" # pragma: no cover
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return InitializationOptions(
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server_name=self.name,
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server_version=self.version if self.version else pkg_version("mcp"),
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title=self.title,
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description=self.description,
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capabilities=self.get_capabilities(
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notification_options or NotificationOptions(),
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experimental_capabilities or {},
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),
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instructions=self.instructions,
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website_url=self.website_url,
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icons=self.icons,
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)
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def get_capabilities(
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self,
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notification_options: NotificationOptions,
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experimental_capabilities: dict[str, dict[str, Any]],
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) -> types.ServerCapabilities:
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"""Convert existing handlers to a ServerCapabilities object."""
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prompts_capability = None
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resources_capability = None
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tools_capability = None
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logging_capability = None
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completions_capability = None
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# Set prompt capabilities if handler exists
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if "prompts/list" in self._request_handlers:
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prompts_capability = types.PromptsCapability(list_changed=notification_options.prompts_changed)
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# Set resource capabilities if handler exists
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if "resources/list" in self._request_handlers:
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resources_capability = types.ResourcesCapability(
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subscribe="resources/subscribe" in self._request_handlers,
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list_changed=notification_options.resources_changed,
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)
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# Set tool capabilities if handler exists
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if "tools/list" in self._request_handlers:
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tools_capability = types.ToolsCapability(list_changed=notification_options.tools_changed)
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# Set logging capabilities if handler exists
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if "logging/setLevel" in self._request_handlers:
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logging_capability = types.LoggingCapability()
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# Set completions capabilities if handler exists
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if "completion/complete" in self._request_handlers:
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completions_capability = types.CompletionsCapability()
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capabilities = types.ServerCapabilities(
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prompts=prompts_capability,
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resources=resources_capability,
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tools=tools_capability,
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logging=logging_capability,
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experimental=experimental_capabilities,
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completions=completions_capability,
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)
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if self._experimental_handlers:
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self._experimental_handlers.update_capabilities(capabilities)
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return capabilities
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@property
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def experimental(self) -> ExperimentalHandlers[LifespanResultT]:
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"""Experimental APIs for tasks and other features.
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WARNING: These APIs are experimental and may change without notice.
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"""
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# We create this inline so we only add these capabilities _if_ they're actually used
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if self._experimental_handlers is None:
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self._experimental_handlers = ExperimentalHandlers(
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add_request_handler=self._add_request_handler,
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has_handler=self._has_handler,
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)
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return self._experimental_handlers
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@property
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def session_manager(self) -> StreamableHTTPSessionManager:
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"""Get the StreamableHTTP session manager.
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Raises:
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RuntimeError: If called before streamable_http_app() has been called.
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"""
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if self._session_manager is None: # pragma: no cover
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raise RuntimeError(
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"Session manager can only be accessed after calling streamable_http_app(). "
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"The session manager is created lazily to avoid unnecessary initialization."
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)
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return self._session_manager # pragma: no cover
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async def run(
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self,
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read_stream: MemoryObjectReceiveStream[SessionMessage | Exception],
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write_stream: MemoryObjectSendStream[SessionMessage],
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initialization_options: InitializationOptions,
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# When False, exceptions are returned as messages to the client.
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# When True, exceptions are raised, which will cause the server to shut down
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# but also make tracing exceptions much easier during testing and when using
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# in-process servers.
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raise_exceptions: bool = False,
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# When True, the server is stateless and
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# clients can perform initialization with any node. The client must still follow
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# the initialization lifecycle, but can do so with any available node
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# rather than requiring initialization for each connection.
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stateless: bool = False,
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):
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async with AsyncExitStack() as stack:
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lifespan_context = await stack.enter_async_context(self.lifespan(self))
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session = await stack.enter_async_context(
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ServerSession(
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read_stream,
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write_stream,
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initialization_options,
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stateless=stateless,
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)
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)
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# Configure task support for this session if enabled
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task_support = self._experimental_handlers.task_support if self._experimental_handlers else None
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if task_support is not None:
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task_support.configure_session(session)
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await stack.enter_async_context(task_support.run())
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async with anyio.create_task_group() as tg:
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async for message in session.incoming_messages:
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logger.debug("Received message: %s", message)
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tg.start_soon(
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self._handle_message,
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message,
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session,
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lifespan_context,
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raise_exceptions,
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)
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async def _handle_message(
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self,
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message: RequestResponder[types.ClientRequest, types.ServerResult] | types.ClientNotification | Exception,
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session: ServerSession,
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lifespan_context: LifespanResultT,
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raise_exceptions: bool = False,
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):
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with warnings.catch_warnings(record=True) as w:
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match message:
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case RequestResponder() as responder:
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with responder:
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await self._handle_request(
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message, responder.request, session, lifespan_context, raise_exceptions
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)
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case Exception():
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logger.error(f"Received exception from stream: {message}")
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await session.send_log_message(
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level="error",
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data="Internal Server Error",
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logger="mcp.server.exception_handler",
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)
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if raise_exceptions:
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raise message
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case _:
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await self._handle_notification(message, session, lifespan_context)
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for warning in w: # pragma: lax no cover
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logger.info("Warning: %s: %s", warning.category.__name__, warning.message)
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async def _handle_request(
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self,
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message: RequestResponder[types.ClientRequest, types.ServerResult],
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req: types.ClientRequest,
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session: ServerSession,
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lifespan_context: LifespanResultT,
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raise_exceptions: bool,
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):
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logger.info("Processing request of type %s", type(req).__name__)
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if handler := self._request_handlers.get(req.method):
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logger.debug("Dispatching request of type %s", type(req).__name__)
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try:
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# Extract request context and close_sse_stream from message metadata
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request_data = None
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close_sse_stream_cb = None
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close_standalone_sse_stream_cb = None
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if message.message_metadata is not None and isinstance(message.message_metadata, ServerMessageMetadata):
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request_data = message.message_metadata.request_context
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close_sse_stream_cb = message.message_metadata.close_sse_stream
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close_standalone_sse_stream_cb = message.message_metadata.close_standalone_sse_stream
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client_capabilities = session.client_params.capabilities if session.client_params else None
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task_support = self._experimental_handlers.task_support if self._experimental_handlers else None
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# Get task metadata from request params if present
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task_metadata = None
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if hasattr(req, "params") and req.params is not None:
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task_metadata = getattr(req.params, "task", None)
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ctx = ServerRequestContext(
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request_id=message.request_id,
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meta=message.request_meta,
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session=session,
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lifespan_context=lifespan_context,
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experimental=Experimental(
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task_metadata=task_metadata,
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_client_capabilities=client_capabilities,
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_session=session,
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_task_support=task_support,
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),
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request=request_data,
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close_sse_stream=close_sse_stream_cb,
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close_standalone_sse_stream=close_standalone_sse_stream_cb,
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)
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token = request_ctx.set(ctx)
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try:
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response = await handler(ctx, req.params)
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finally:
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request_ctx.reset(token)
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except MCPError as err:
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response = err.error
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except anyio.get_cancelled_exc_class():
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logger.info("Request %s cancelled - duplicate response suppressed", message.request_id)
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return
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except Exception as err:
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if raise_exceptions: # pragma: no cover
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raise err
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response = types.ErrorData(code=0, message=str(err), data=None)
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|
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await message.respond(response)
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else: # pragma: no cover
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await message.respond(types.ErrorData(code=types.METHOD_NOT_FOUND, message="Method not found"))
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logger.debug("Response sent")
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|
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async def _handle_notification(
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self,
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notify: types.ClientNotification,
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session: ServerSession,
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lifespan_context: LifespanResultT,
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) -> None:
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if handler := self._notification_handlers.get(notify.method):
|
|
logger.debug("Dispatching notification of type %s", type(notify).__name__)
|
|
|
|
try:
|
|
client_capabilities = session.client_params.capabilities if session.client_params else None
|
|
task_support = self._experimental_handlers.task_support if self._experimental_handlers else None
|
|
ctx = ServerRequestContext(
|
|
session=session,
|
|
lifespan_context=lifespan_context,
|
|
experimental=Experimental(
|
|
task_metadata=None,
|
|
_client_capabilities=client_capabilities,
|
|
_session=session,
|
|
_task_support=task_support,
|
|
),
|
|
)
|
|
await handler(ctx, notify.params)
|
|
except Exception: # pragma: no cover
|
|
logger.exception("Uncaught exception in notification handler")
|
|
|
|
def streamable_http_app(
|
|
self,
|
|
*,
|
|
streamable_http_path: str = "/mcp",
|
|
json_response: bool = False,
|
|
stateless_http: bool = False,
|
|
event_store: EventStore | None = None,
|
|
retry_interval: int | None = None,
|
|
transport_security: TransportSecuritySettings | None = None,
|
|
host: str = "127.0.0.1",
|
|
auth: AuthSettings | None = None,
|
|
token_verifier: TokenVerifier | None = None,
|
|
auth_server_provider: OAuthAuthorizationServerProvider[Any, Any, Any] | None = None,
|
|
custom_starlette_routes: list[Route] | None = None,
|
|
debug: bool = False,
|
|
) -> Starlette:
|
|
"""Return an instance of the StreamableHTTP server app."""
|
|
# Auto-enable DNS rebinding protection for localhost (IPv4 and IPv6)
|
|
if transport_security is None and host in ("127.0.0.1", "localhost", "::1"):
|
|
transport_security = TransportSecuritySettings(
|
|
enable_dns_rebinding_protection=True,
|
|
allowed_hosts=["127.0.0.1:*", "localhost:*", "[::1]:*"],
|
|
allowed_origins=["http://127.0.0.1:*", "http://localhost:*", "http://[::1]:*"],
|
|
)
|
|
|
|
session_manager = StreamableHTTPSessionManager(
|
|
app=self,
|
|
event_store=event_store,
|
|
retry_interval=retry_interval,
|
|
json_response=json_response,
|
|
stateless=stateless_http,
|
|
security_settings=transport_security,
|
|
)
|
|
self._session_manager = session_manager
|
|
|
|
# Create the ASGI handler
|
|
streamable_http_app = StreamableHTTPASGIApp(session_manager)
|
|
|
|
# Create routes
|
|
routes: list[Route | Mount] = []
|
|
middleware: list[Middleware] = []
|
|
required_scopes: list[str] = []
|
|
|
|
# Set up auth if configured
|
|
if auth: # pragma: no cover
|
|
required_scopes = auth.required_scopes or []
|
|
|
|
# Add auth middleware if token verifier is available
|
|
if token_verifier:
|
|
middleware = [
|
|
Middleware(
|
|
AuthenticationMiddleware,
|
|
backend=BearerAuthBackend(token_verifier),
|
|
),
|
|
Middleware(AuthContextMiddleware),
|
|
]
|
|
|
|
# Add auth endpoints if auth server provider is configured
|
|
if auth_server_provider:
|
|
routes.extend(
|
|
create_auth_routes(
|
|
provider=auth_server_provider,
|
|
issuer_url=auth.issuer_url,
|
|
service_documentation_url=auth.service_documentation_url,
|
|
client_registration_options=auth.client_registration_options,
|
|
revocation_options=auth.revocation_options,
|
|
)
|
|
)
|
|
|
|
# Set up routes with or without auth
|
|
if token_verifier: # pragma: no cover
|
|
# Determine resource metadata URL
|
|
resource_metadata_url = None
|
|
if auth and auth.resource_server_url:
|
|
# Build compliant metadata URL for WWW-Authenticate header
|
|
resource_metadata_url = build_resource_metadata_url(auth.resource_server_url)
|
|
|
|
routes.append(
|
|
Route(
|
|
streamable_http_path,
|
|
endpoint=RequireAuthMiddleware(streamable_http_app, required_scopes, resource_metadata_url),
|
|
)
|
|
)
|
|
else:
|
|
# Auth is disabled, no wrapper needed
|
|
routes.append(
|
|
Route(
|
|
streamable_http_path,
|
|
endpoint=streamable_http_app,
|
|
)
|
|
)
|
|
|
|
# Add protected resource metadata endpoint if configured as RS
|
|
if auth and auth.resource_server_url: # pragma: no cover
|
|
routes.extend(
|
|
create_protected_resource_routes(
|
|
resource_url=auth.resource_server_url,
|
|
authorization_servers=[auth.issuer_url],
|
|
scopes_supported=auth.required_scopes,
|
|
)
|
|
)
|
|
|
|
if custom_starlette_routes: # pragma: no cover
|
|
routes.extend(custom_starlette_routes)
|
|
|
|
return Starlette(
|
|
debug=debug,
|
|
routes=routes,
|
|
middleware=middleware,
|
|
lifespan=lambda app: session_manager.run(),
|
|
)
|