wehub-resource-sync
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55 lines
1.8 KiB
Python
55 lines
1.8 KiB
Python
"""Dispatch-layer middleware: `Server.middleware` is the public hook.
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A lowlevel-only story: `MCPServer` has no public middleware accessor yet, so the
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one supported registration point is the `middleware` list on `lowlevel.Server`.
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"""
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import json
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from typing import Any
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import mcp_types as types
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from mcp.server.context import CallNext, HandlerResult, ServerRequestContext
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from mcp.server.lowlevel import Server
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from stories._hosting import run_server_from_args
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def build_server() -> Server[Any]:
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log: list[str] = []
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async def record_calls(ctx: ServerRequestContext[Any], call_next: CallNext) -> HandlerResult:
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log.append(ctx.method)
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try:
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return await call_next(ctx)
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finally:
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log.append(f"{ctx.method}:done")
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async def list_tools(
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ctx: ServerRequestContext[Any], params: types.PaginatedRequestParams | None
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) -> types.ListToolsResult:
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return types.ListToolsResult(
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tools=[
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types.Tool(
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name="audit_log",
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description="Return every method the middleware has observed so far.",
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input_schema={"type": "object"},
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)
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]
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)
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async def call_tool(ctx: ServerRequestContext[Any], params: types.CallToolRequestParams) -> types.CallToolResult:
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assert params.name == "audit_log"
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snapshot = list(log)
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return types.CallToolResult(
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content=[types.TextContent(text=json.dumps(snapshot))],
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structured_content={"result": snapshot},
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)
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server = Server("middleware-example", on_list_tools=list_tools, on_call_tool=call_tool)
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server.middleware.append(record_calls)
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return server
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if __name__ == "__main__":
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run_server_from_args(build_server)
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