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#![cfg(feature = "ready-cache")]
#[path = "../support.rs"]
mod support;
use std::pin::Pin;
use tokio_test::{assert_pending, assert_ready, task};
use tower::ready_cache::{error, ReadyCache};
use tower_test::mock;
type Req = &'static str;
type Mock = mock::Mock<Req, Req>;
#[test]
fn poll_ready_inner_failure() {
let _t = support::trace_init();
let mut task = task::spawn(());
let mut cache = ReadyCache::<usize, Mock, Req>::default();
let (service0, mut handle0) = mock::pair::<Req, Req>();
handle0.send_error("doom");
cache.push(0, service0);
let (service1, mut handle1) = mock::pair::<Req, Req>();
handle1.allow(1);
cache.push(1, service1);
let failed = assert_ready!(task.enter(|cx, _| cache.poll_pending(cx))).unwrap_err();
assert_eq!(failed.0, 0);
assert_eq!(format!("{}", failed.1), "doom");
assert_eq!(cache.len(), 1);
}
#[test]
fn poll_ready_not_ready() {
let _t = support::trace_init();
let mut task = task::spawn(());
let mut cache = ReadyCache::<usize, Mock, Req>::default();
let (service0, mut handle0) = mock::pair::<Req, Req>();
handle0.allow(0);
cache.push(0, service0);
let (service1, mut handle1) = mock::pair::<Req, Req>();
handle1.allow(0);
cache.push(1, service1);
assert_pending!(task.enter(|cx, _| cache.poll_pending(cx)));
assert_eq!(cache.ready_len(), 0);
assert_eq!(cache.pending_len(), 2);
assert_eq!(cache.len(), 2);
}
#[test]
fn poll_ready_promotes_inner() {
let _t = support::trace_init();
let mut task = task::spawn(());
let mut cache = ReadyCache::<usize, Mock, Req>::default();
let (service0, mut handle0) = mock::pair::<Req, Req>();
handle0.allow(1);
cache.push(0, service0);
let (service1, mut handle1) = mock::pair::<Req, Req>();
handle1.allow(1);
cache.push(1, service1);
assert_eq!(cache.ready_len(), 0);
assert_eq!(cache.pending_len(), 2);
assert_eq!(cache.len(), 2);
assert_ready!(task.enter(|cx, _| cache.poll_pending(cx))).unwrap();
assert_eq!(cache.ready_len(), 2);
assert_eq!(cache.pending_len(), 0);
assert_eq!(cache.len(), 2);
}
#[test]
fn evict_ready_then_error() {
let _t = support::trace_init();
let mut task = task::spawn(());
let mut cache = ReadyCache::<usize, Mock, Req>::default();
let (service, mut handle) = mock::pair::<Req, Req>();
handle.allow(0);
cache.push(0, service);
assert_pending!(task.enter(|cx, _| cache.poll_pending(cx)));
handle.allow(1);
assert_ready!(task.enter(|cx, _| cache.poll_pending(cx))).unwrap();
handle.send_error("doom");
assert!(cache.evict(&0));
assert_ready!(task.enter(|cx, _| cache.poll_pending(cx))).unwrap();
}
#[test]
fn evict_pending_then_error() {
let _t = support::trace_init();
let mut task = task::spawn(());
let mut cache = ReadyCache::<usize, Mock, Req>::default();
let (service, mut handle) = mock::pair::<Req, Req>();
handle.allow(0);
cache.push(0, service);
assert_pending!(task.enter(|cx, _| cache.poll_pending(cx)));
handle.send_error("doom");
assert!(cache.evict(&0));
assert_ready!(task.enter(|cx, _| cache.poll_pending(cx))).unwrap();
}
#[test]
fn push_then_evict() {
let _t = support::trace_init();
let mut task = task::spawn(());
let mut cache = ReadyCache::<usize, Mock, Req>::default();
let (service, mut handle) = mock::pair::<Req, Req>();
handle.allow(0);
cache.push(0, service);
handle.send_error("doom");
assert!(cache.evict(&0));
assert_ready!(task.enter(|cx, _| cache.poll_pending(cx))).unwrap();
}
#[test]
fn error_after_promote() {
let _t = support::trace_init();
let mut task = task::spawn(());
let mut cache = ReadyCache::<usize, Mock, Req>::default();
let (service, mut handle) = mock::pair::<Req, Req>();
handle.allow(0);
cache.push(0, service);
assert_pending!(task.enter(|cx, _| cache.poll_pending(cx)));
handle.allow(1);
assert_ready!(task.enter(|cx, _| cache.poll_pending(cx))).unwrap();
handle.send_error("doom");
assert_ready!(task.enter(|cx, _| cache.poll_pending(cx))).unwrap();
}
#[test]
fn duplicate_key_by_index() {
let _t = support::trace_init();
let mut task = task::spawn(());
let mut cache = ReadyCache::<usize, Mock, Req>::default();
let (service0, mut handle0) = mock::pair::<Req, Req>();
handle0.allow(1);
cache.push(0, service0);
let (service1, mut handle1) = mock::pair::<Req, Req>();
handle1.allow(1);
// this push should replace the old service (service0)
cache.push(0, service1);
// this evict should evict service1
cache.evict(&0);
// poll_pending should complete (there are no remaining pending services)
assert_ready!(task.enter(|cx, _| cache.poll_pending(cx))).unwrap();
// but service 0 should not be ready (1 replaced, 1 evicted)
assert!(!task.enter(|cx, _| cache.check_ready(cx, &0)).unwrap());
let (service2, mut handle2) = mock::pair::<Req, Req>();
handle2.allow(1);
// this push should ensure replace the evicted service1
cache.push(0, service2);
// there should be no more pending
assert_ready!(task.enter(|cx, _| cache.poll_pending(cx))).unwrap();
// _and_ service 0 should now be callable
assert!(task.enter(|cx, _| cache.check_ready(cx, &0)).unwrap());
}
// Tests https://github.com/tower-rs/tower/issues/415
#[tokio::test(flavor = "current_thread")]
async fn cancelation_observed() {
let mut cache = ReadyCache::default();
let mut handles = vec![];
// NOTE This test passes at 129 items, but fails at 130 items (if coop
// scheduling interferes with cancelation).
for _ in 0..130 {
let (svc, mut handle) = tower_test::mock::pair::<(), ()>();
handle.allow(1);
cache.push("ep0", svc);
handles.push(handle);
}
struct Ready(ReadyCache<&'static str, tower_test::mock::Mock<(), ()>, ()>);
impl Unpin for Ready {}
impl std::future::Future for Ready {
type Output = Result<(), error::Failed<&'static str>>;
fn poll(
self: Pin<&mut Self>,
cx: &mut std::task::Context<'_>,
) -> std::task::Poll<Self::Output> {
self.get_mut().0.poll_pending(cx)
}
}
Ready(cache).await.unwrap();
}
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