wehub-resource-sync
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48 lines
1.5 KiB
Python
48 lines
1.5 KiB
Python
"""Mount an MCPServer in an existing Starlette app at a sub-path, alongside non-MCP routes; exports `build_app()`."""
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import contextlib
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from collections.abc import AsyncIterator
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from starlette.applications import Starlette
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from starlette.requests import Request
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from starlette.responses import JSONResponse
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from starlette.routing import Mount, Route
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from mcp.server.mcpserver import MCPServer
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from stories._hosting import NO_DNS_REBIND, run_app_from_args
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def build_app() -> Starlette:
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mcp = MCPServer("starlette-mount-example")
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@mcp.tool()
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def greet(name: str) -> str:
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"""Return a greeting."""
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return f"Hello, {name}! (served from a Starlette sub-mount)"
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# streamable_http_path="/" so Mount("/api", ...) serves the MCP endpoint at
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# /api itself, not /api/mcp. The returned sub-app has its own lifespan, but
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# Starlette does not run nested lifespans under Mount — the parent app below
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# must enter mcp.session_manager.run() itself.
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mcp_app = mcp.streamable_http_app(streamable_http_path="/", transport_security=NO_DNS_REBIND)
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async def health(_request: Request) -> JSONResponse:
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return JSONResponse({"status": "ok"})
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@contextlib.asynccontextmanager
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async def lifespan(_app: Starlette) -> AsyncIterator[None]:
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async with mcp.session_manager.run():
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yield
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return Starlette(
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routes=[
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Route("/health", health),
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Mount("/api", app=mcp_app),
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],
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lifespan=lifespan,
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)
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if __name__ == "__main__":
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run_app_from_args(build_app)
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