43 lines
1.2 KiB
Rust
43 lines
1.2 KiB
Rust
use std::sync::Arc;
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use service_rpc::{serve, RpcClient, RpcError, RpcResult, RpcService};
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use tokio::net::TcpListener;
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struct Doubler;
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#[async_trait::async_trait]
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impl RpcService for Doubler {
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type Request = i32;
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type Response = i32;
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fn service_name(&self) -> &'static str {
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"doubler"
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}
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async fn call(&self, request: i32) -> RpcResult<i32> {
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if request == 0 {
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return Err(RpcError::Rejected("zero is not allowed".to_owned()));
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}
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Ok(request * 2)
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}
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}
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#[tokio::test]
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async fn error_reaches_caller() {
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let listener = TcpListener::bind("127.0.0.1:0").await.expect("bind");
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let endpoint = listener.local_addr().expect("addr").to_string();
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tokio::spawn(async move {
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let _ = serve(listener, Arc::new(Doubler)).await;
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});
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let client: RpcClient<i32, i32> = RpcClient::with_pool_size(endpoint, 1);
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assert_eq!(client.call(&5).await.expect("ok call"), 10);
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match client.call(&0).await {
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Err(RpcError::Rejected(message)) => assert_eq!(message, "zero is not allowed"),
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other => panic!("expected a rejection, got {other:?}"),
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}
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assert_eq!(
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client.call(&7).await.expect("connection survived the error"),
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14
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);
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}
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