wehub-resource-sync
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36 lines
1.3 KiB
Python
36 lines
1.3 KiB
Python
"""SEP-1699: a tool closes its own SSE stream mid-call; the event store buffers the rest. Exports `build_app()`."""
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from starlette.applications import Starlette
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from mcp.server.mcpserver import Context, MCPServer
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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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def build_app() -> Starlette:
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mcp = MCPServer("sse-polling-example")
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@mcp.tool()
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async def long_operation(ctx: Context) -> str:
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"""Emit progress, close this call's SSE stream, emit more progress, then return.
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Everything sent after `close_sse_stream()` lands in the event store and is
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replayed when the client reconnects with `Last-Event-ID`.
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"""
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await ctx.report_progress(0.5, total=1.0, message="before-close")
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await ctx.close_sse_stream()
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await ctx.report_progress(1.0, total=1.0, message="after-close")
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return "resumed"
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# event_store enables Last-Event-ID replay; retry_interval=0 makes the client's
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# reconnect wait a no-op so the example is deterministic without real time.
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return mcp.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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