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| 1 | +#![cfg(all(feature = "server", feature = "client", not(feature = "local")))] |
| 2 | +#![allow(deprecated)] |
| 3 | + |
| 4 | +use std::sync::{Arc, Mutex}; |
| 5 | + |
| 6 | +use rmcp::{ |
| 7 | + ClientHandler, RoleClient, RoleServer, ServerHandler, ServiceError, ServiceExt, |
| 8 | + model::{ |
| 9 | + CallToolRequestParams, CallToolResponse, CallToolResult, ClientInfo, ContentBlock, |
| 10 | + CreateMessageRequestParams, CreateMessageResult, ProtocolVersion, SamplingMessage, |
| 11 | + ServerCapabilities, ServerInfo, |
| 12 | + }, |
| 13 | + service::RequestContext, |
| 14 | +}; |
| 15 | +use tokio::sync::oneshot; |
| 16 | + |
| 17 | +#[derive(Clone)] |
| 18 | +struct SamplingServer { |
| 19 | + outside: Arc<Mutex<Option<oneshot::Sender<Result<(), ServiceError>>>>>, |
| 20 | +} |
| 21 | + |
| 22 | +impl ServerHandler for SamplingServer { |
| 23 | + fn get_info(&self) -> ServerInfo { |
| 24 | + ServerInfo::new(ServerCapabilities::builder().enable_tools().build()) |
| 25 | + } |
| 26 | + |
| 27 | + async fn call_tool( |
| 28 | + &self, |
| 29 | + _request: CallToolRequestParams, |
| 30 | + context: RequestContext<RoleServer>, |
| 31 | + ) -> Result<CallToolResponse, rmcp::ErrorData> { |
| 32 | + let peer = context.peer.clone(); |
| 33 | + let nested = peer |
| 34 | + .create_message(CreateMessageRequestParams::new( |
| 35 | + vec![SamplingMessage::user_text("nested")], |
| 36 | + 16, |
| 37 | + )) |
| 38 | + .await; |
| 39 | + let slot = self.outside.clone(); |
| 40 | + tokio::spawn(async move { |
| 41 | + let outside = peer |
| 42 | + .create_message(CreateMessageRequestParams::new( |
| 43 | + vec![SamplingMessage::user_text("standalone")], |
| 44 | + 16, |
| 45 | + )) |
| 46 | + .await |
| 47 | + .map(|_| ()); |
| 48 | + if let Some(tx) = slot.lock().unwrap().take() { |
| 49 | + let _ = tx.send(outside); |
| 50 | + } |
| 51 | + }); |
| 52 | + nested.map_err(|e| rmcp::ErrorData::internal_error(e.to_string(), None))?; |
| 53 | + Ok(CallToolResult::success(vec![ContentBlock::text("ok")]).into()) |
| 54 | + } |
| 55 | +} |
| 56 | + |
| 57 | +#[derive(Clone)] |
| 58 | +struct SamplingClient; |
| 59 | + |
| 60 | +impl ClientHandler for SamplingClient { |
| 61 | + async fn create_message( |
| 62 | + &self, |
| 63 | + _params: CreateMessageRequestParams, |
| 64 | + _context: RequestContext<RoleClient>, |
| 65 | + ) -> Result<CreateMessageResult, rmcp::ErrorData> { |
| 66 | + Ok(CreateMessageResult::new( |
| 67 | + SamplingMessage::assistant_text("pong"), |
| 68 | + "test-model".to_string(), |
| 69 | + ) |
| 70 | + .with_stop_reason(CreateMessageResult::STOP_REASON_END_TURN)) |
| 71 | + } |
| 72 | + |
| 73 | + fn get_info(&self) -> ClientInfo { |
| 74 | + let mut info = ClientInfo::default(); |
| 75 | + info.protocol_version = ProtocolVersion::V_2026_07_28; |
| 76 | + info |
| 77 | + } |
| 78 | +} |
| 79 | + |
| 80 | +#[tokio::test] |
| 81 | +async fn nested_sampling_allowed_standalone_rejected() -> anyhow::Result<()> { |
| 82 | + let (server_transport, client_transport) = tokio::io::duplex(4096); |
| 83 | + let (tx, rx) = oneshot::channel(); |
| 84 | + let server = SamplingServer { |
| 85 | + outside: Arc::new(Mutex::new(Some(tx))), |
| 86 | + }; |
| 87 | + let server_handle = tokio::spawn(async move { |
| 88 | + let running = server.serve(server_transport).await?; |
| 89 | + running.waiting().await?; |
| 90 | + anyhow::Ok(()) |
| 91 | + }); |
| 92 | + |
| 93 | + let client = SamplingClient.serve(client_transport).await?; |
| 94 | + |
| 95 | + let result = client |
| 96 | + .peer() |
| 97 | + .call_tool(CallToolRequestParams::new("sample")) |
| 98 | + .await?; |
| 99 | + assert_eq!( |
| 100 | + result.content.first().unwrap().as_text().unwrap().text, |
| 101 | + "ok" |
| 102 | + ); |
| 103 | + |
| 104 | + let outside = rx.await?; |
| 105 | + assert!(matches!(outside, Err(ServiceError::McpError(_)))); |
| 106 | + |
| 107 | + client.cancel().await?; |
| 108 | + let _ = server_handle.await?; |
| 109 | + Ok(()) |
| 110 | +} |
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