41 lines
1.2 KiB
Rust
41 lines
1.2 KiB
Rust
use std::task::{Context, Poll};
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use std::{future::Future, pin::Pin};
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use tower::util::ServiceExt;
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use tower_service::Service;
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#[tokio::test(flavor = "current_thread")]
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async fn service_driven_to_readiness() {
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// This test ensures that `oneshot` will repeatedly call `poll_ready` until
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// the service is ready.
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let _t = super::support::trace_init();
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struct PollMeTwice {
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ready: bool,
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}
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impl Service<()> for PollMeTwice {
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type Error = ();
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type Response = ();
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type Future = Pin<
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Box<dyn Future<Output = Result<Self::Response, Self::Error>> + Send + Sync + 'static>,
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>;
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fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), ()>> {
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if self.ready {
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Poll::Ready(Ok(()))
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} else {
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self.ready = true;
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cx.waker().wake_by_ref();
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Poll::Pending
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}
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}
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fn call(&mut self, _: ()) -> Self::Future {
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assert!(self.ready, "service not driven to readiness!");
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Box::pin(async { Ok(()) })
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}
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}
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let svc = PollMeTwice { ready: false };
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svc.oneshot(()).await.unwrap();
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}
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