wehub-resource-sync
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46 lines
1.7 KiB
Python
46 lines
1.7 KiB
Python
"""SEP-1699 polling on the lowlevel `Server`: close the request's SSE stream mid-handler."""
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from typing import Any
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import mcp_types as types
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from starlette.applications import Starlette
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from mcp.server.context import ServerRequestContext
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from mcp.server.lowlevel import Server
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from stories._hosting import NO_DNS_REBIND, run_app_from_args
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from stories.sse_polling.event_store import InMemoryEventStore
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_TOOL = types.Tool(
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name="long_operation",
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description="Emit progress, close the SSE stream, emit more, return.",
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input_schema={"type": "object", "properties": {}},
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)
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def build_app() -> Starlette:
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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(tools=[_TOOL])
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async def call_tool(ctx: ServerRequestContext[Any], params: types.CallToolRequestParams) -> types.CallToolResult:
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assert params.name == "long_operation"
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await ctx.session.report_progress(0.5, total=1.0, message="before-close")
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# The transport only wires this callback when an event_store is configured and the
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# negotiated version is in the 2025 era; it is None otherwise.
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if ctx.close_sse_stream is not None:
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await ctx.close_sse_stream()
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await ctx.session.report_progress(1.0, total=1.0, message="after-close")
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return types.CallToolResult(content=[types.TextContent(text="resumed")])
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server = Server("sse-polling-example", on_list_tools=list_tools, on_call_tool=call_tool)
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return server.streamable_http_app(
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event_store=InMemoryEventStore(),
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retry_interval=0,
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transport_security=NO_DNS_REBIND,
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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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