wehub-resource-sync
49b9bb6724
Deploy Docs / deploy-docs (push) Failing after 1s
Conformance Tests / client-conformance (push) Failing after 3s
Conformance Tests / server-conformance (push) Failing after 1s
GitHub Actions Security Analysis / zizmor (push) Failing after 1s
CI / checks (push) Failing after 59m20s
CI / all-green (push) Waiting to run
40 lines
1.2 KiB
Python
40 lines
1.2 KiB
Python
"""Process-scoped dependency injection via `MCPServer(lifespan=...)`."""
|
|
|
|
from collections.abc import AsyncIterator
|
|
from contextlib import asynccontextmanager
|
|
from dataclasses import dataclass
|
|
from typing import Any
|
|
|
|
from mcp.server.mcpserver import Context, MCPServer
|
|
from stories._hosting import run_server_from_args
|
|
|
|
|
|
@dataclass
|
|
class AppState:
|
|
db: dict[str, str]
|
|
|
|
|
|
@asynccontextmanager
|
|
async def app_lifespan(server: MCPServer[AppState]) -> AsyncIterator[AppState]:
|
|
"""Acquire process-scoped resources at startup; release them at shutdown."""
|
|
db = {"alpha": "one", "beta": "two"} # e.g. `await pool.connect()`
|
|
try:
|
|
yield AppState(db=db)
|
|
finally:
|
|
db.clear() # e.g. `await pool.disconnect()`
|
|
|
|
|
|
def build_server() -> MCPServer[AppState]:
|
|
mcp = MCPServer[AppState]("lifespan-example", lifespan=app_lifespan)
|
|
|
|
@mcp.tool(description="Look up a key in the process-scoped store.")
|
|
def lookup(key: str, ctx: Context[AppState, Any]) -> str:
|
|
# Interim 3-hop path; shortens to `ctx.state.db` in a later release.
|
|
return ctx.request_context.lifespan_context.db[key]
|
|
|
|
return mcp
|
|
|
|
|
|
if __name__ == "__main__":
|
|
run_server_from_args(build_server)
|