wehub-resource-sync
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103 lines
2.7 KiB
Python
103 lines
2.7 KiB
Python
"""Run from the repository root:
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uv run examples/snippets/servers/lowlevel/lifespan.py
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"""
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from collections.abc import AsyncIterator
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from contextlib import asynccontextmanager
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from typing import TypedDict
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import mcp_types as types
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import mcp.server.stdio
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from mcp.server import Server, ServerRequestContext
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# Mock database class for example
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class Database:
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"""Mock database class for example."""
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@classmethod
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async def connect(cls) -> "Database":
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"""Connect to database."""
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print("Database connected")
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return cls()
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async def disconnect(self) -> None:
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"""Disconnect from database."""
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print("Database disconnected")
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async def query(self, query_str: str) -> list[dict[str, str]]:
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"""Execute a query."""
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# Simulate database query
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return [{"id": "1", "name": "Example", "query": query_str}]
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class AppContext(TypedDict):
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db: Database
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@asynccontextmanager
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async def server_lifespan(_server: Server[AppContext]) -> AsyncIterator[AppContext]:
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"""Manage server startup and shutdown lifecycle."""
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db = await Database.connect()
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try:
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yield {"db": db}
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finally:
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await db.disconnect()
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async def handle_list_tools(
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ctx: ServerRequestContext[AppContext], params: types.PaginatedRequestParams | None
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) -> types.ListToolsResult:
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"""List available tools."""
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return types.ListToolsResult(
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tools=[
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types.Tool(
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name="query_db",
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description="Query the database",
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input_schema={
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"type": "object",
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"properties": {"query": {"type": "string", "description": "SQL query to execute"}},
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"required": ["query"],
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},
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)
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]
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)
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async def handle_call_tool(
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ctx: ServerRequestContext[AppContext], params: types.CallToolRequestParams
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) -> types.CallToolResult:
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"""Handle database query tool call."""
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if params.name != "query_db":
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raise ValueError(f"Unknown tool: {params.name}")
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db = ctx.lifespan_context["db"]
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results = await db.query((params.arguments or {})["query"])
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return types.CallToolResult(content=[types.TextContent(type="text", text=f"Query results: {results}")])
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server = Server(
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"example-server",
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lifespan=server_lifespan,
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on_list_tools=handle_list_tools,
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on_call_tool=handle_call_tool,
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)
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async def run():
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"""Run the server with lifespan management."""
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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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if __name__ == "__main__":
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import asyncio
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asyncio.run(run())
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