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#![cfg(feature = "hedge")]
#[path = "../support.rs"]
mod support;
use std::time::Duration;
use tokio::time;
use tokio_test::{assert_pending, assert_ready, assert_ready_ok, task};
use tower::hedge::{Hedge, Policy};
use tower_test::{assert_request_eq, mock};
#[tokio::test(flavor = "current_thread")]
async fn hedge_orig_completes_first() {
let _t = support::trace_init();
time::pause();
let (mut service, mut handle) = new_service(TestPolicy);
assert_ready_ok!(service.poll_ready());
let mut fut = task::spawn(service.call("orig"));
// Check that orig request has been issued.
let req = assert_request_eq!(handle, "orig");
// Check fut is not ready.
assert_pending!(fut.poll());
// Check hedge has not been issued.
assert_pending!(handle.poll_request());
time::advance(Duration::from_millis(11)).await;
// Check fut is not ready.
assert_pending!(fut.poll());
// Check that the hedge has been issued.
let _hedge_req = assert_request_eq!(handle, "orig");
req.send_response("orig-done");
// Check that fut gets orig response.
assert_eq!(assert_ready_ok!(fut.poll()), "orig-done");
}
#[tokio::test(flavor = "current_thread")]
async fn hedge_hedge_completes_first() {
let _t = support::trace_init();
time::pause();
let (mut service, mut handle) = new_service(TestPolicy);
assert_ready_ok!(service.poll_ready());
let mut fut = task::spawn(service.call("orig"));
// Check that orig request has been issued.
let _req = assert_request_eq!(handle, "orig");
// Check fut is not ready.
assert_pending!(fut.poll());
// Check hedge has not been issued.
assert_pending!(handle.poll_request());
time::advance(Duration::from_millis(11)).await;
// Check fut is not ready.
assert_pending!(fut.poll());
// Check that the hedge has been issued.
let hedge_req = assert_request_eq!(handle, "orig");
hedge_req.send_response("hedge-done");
// Check that fut gets hedge response.
assert_eq!(assert_ready_ok!(fut.poll()), "hedge-done");
}
#[tokio::test(flavor = "current_thread")]
async fn completes_before_hedge() {
let _t = support::trace_init();
let (mut service, mut handle) = new_service(TestPolicy);
assert_ready_ok!(service.poll_ready());
let mut fut = task::spawn(service.call("orig"));
// Check that orig request has been issued.
let req = assert_request_eq!(handle, "orig");
// Check fut is not ready.
assert_pending!(fut.poll());
req.send_response("orig-done");
// Check hedge has not been issued.
assert_pending!(handle.poll_request());
// Check that fut gets orig response.
assert_eq!(assert_ready_ok!(fut.poll()), "orig-done");
}
#[tokio::test(flavor = "current_thread")]
async fn request_not_retyable() {
let _t = support::trace_init();
time::pause();
let (mut service, mut handle) = new_service(TestPolicy);
assert_ready_ok!(service.poll_ready());
let mut fut = task::spawn(service.call(NOT_RETRYABLE));
// Check that orig request has been issued.
let req = assert_request_eq!(handle, NOT_RETRYABLE);
// Check fut is not ready.
assert_pending!(fut.poll());
// Check hedge has not been issued.
assert_pending!(handle.poll_request());
time::advance(Duration::from_millis(10)).await;
// Check fut is not ready.
assert_pending!(fut.poll());
// Check hedge has not been issued.
assert_pending!(handle.poll_request());
req.send_response("orig-done");
// Check that fut gets orig response.
assert_eq!(assert_ready_ok!(fut.poll()), "orig-done");
}
#[tokio::test(flavor = "current_thread")]
async fn request_not_clonable() {
let _t = support::trace_init();
time::pause();
let (mut service, mut handle) = new_service(TestPolicy);
assert_ready_ok!(service.poll_ready());
let mut fut = task::spawn(service.call(NOT_CLONABLE));
// Check that orig request has been issued.
let req = assert_request_eq!(handle, NOT_CLONABLE);
// Check fut is not ready.
assert_pending!(fut.poll());
// Check hedge has not been issued.
assert_pending!(handle.poll_request());
time::advance(Duration::from_millis(10)).await;
// Check fut is not ready.
assert_pending!(fut.poll());
// Check hedge has not been issued.
assert_pending!(handle.poll_request());
req.send_response("orig-done");
// Check that fut gets orig response.
assert_eq!(assert_ready_ok!(fut.poll()), "orig-done");
}
type Req = &'static str;
type Res = &'static str;
type Mock = tower_test::mock::Mock<Req, Res>;
type Handle = tower_test::mock::Handle<Req, Res>;
static NOT_RETRYABLE: &str = "NOT_RETRYABLE";
static NOT_CLONABLE: &str = "NOT_CLONABLE";
#[derive(Clone)]
struct TestPolicy;
impl tower::hedge::Policy<Req> for TestPolicy {
fn can_retry(&self, req: &Req) -> bool {
*req != NOT_RETRYABLE
}
fn clone_request(&self, req: &Req) -> Option<Req> {
if *req == NOT_CLONABLE {
None
} else {
Some(req)
}
}
}
fn new_service<P: Policy<Req> + Clone>(policy: P) -> (mock::Spawn<Hedge<Mock, P>>, Handle) {
let (service, handle) = tower_test::mock::pair();
let mock_latencies: [u64; 10] = [1, 1, 1, 1, 1, 1, 1, 1, 10, 10];
let service = Hedge::new_with_mock_latencies(
service,
policy,
10,
0.9,
Duration::from_secs(60),
&mock_latencies,
);
(mock::Spawn::new(service), handle)
}
|
