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|
use crate::runtime::{Park, Unpark};
use crate::time::driver::{self, Driver};
use crate::time::{Clock, Duration, Instant};
use std::marker::PhantomData;
use std::rc::Rc;
use std::sync::{Arc, Mutex};
/// Run the provided closure with a `MockClock` that starts at the current time.
pub(crate) fn mock<F, R>(f: F) -> R
where
F: FnOnce(&mut Handle) -> R,
{
let mut mock = MockClock::new();
mock.enter(f)
}
/// Mock clock for use with `tokio-timer` futures.
///
/// A mock timer that is able to advance and wake after a
/// certain duration.
#[derive(Debug)]
pub(crate) struct MockClock {
time: MockTime,
clock: Clock,
}
/// A handle to the `MockClock`.
#[derive(Debug)]
pub(crate) struct Handle {
timer: Driver<MockPark>,
time: MockTime,
clock: Clock,
}
type Inner = Arc<Mutex<State>>;
#[derive(Debug, Clone)]
struct MockTime {
inner: Inner,
_pd: PhantomData<Rc<()>>,
}
#[derive(Debug)]
struct MockNow {
inner: Inner,
}
#[derive(Debug)]
struct MockPark {
inner: Inner,
_pd: PhantomData<Rc<()>>,
}
#[derive(Debug)]
struct MockUnpark {
inner: Inner,
}
#[derive(Debug)]
struct State {
clock: Clock,
unparked: bool,
park_for: Option<Duration>,
}
impl MockClock {
/// Create a new `MockClock` with the current time.
pub(crate) fn new() -> Self {
let clock = Clock::new_frozen();
let time = MockTime::new(clock.clone());
MockClock { time, clock }
}
/// Enter the `MockClock` context.
pub(crate) fn enter<F, R>(&mut self, f: F) -> R
where
F: FnOnce(&mut Handle) -> R,
{
self.clock.enter(|| {
let park = self.time.mock_park();
let timer = Driver::new(park, self.clock.clone());
let handle = timer.handle();
let _e = driver::set_default(&handle);
let time = self.time.clone();
let mut handle = Handle::new(timer, time, self.clock.clone());
f(&mut handle)
// lazy(|| Ok::<_, ()>(f(&mut handle))).wait().unwrap()
})
}
}
impl Default for MockClock {
fn default() -> Self {
Self::new()
}
}
impl Handle {
pub(self) fn new(timer: Driver<MockPark>, time: MockTime, clock: Clock) -> Self {
Handle { timer, time, clock }
}
/// Turn the internal timer and mock park for the provided duration.
pub(crate) fn turn(&mut self) {
self.timer.park().unwrap();
}
/// Turn the internal timer and mock park for the provided duration.
pub(crate) fn turn_for(&mut self, duration: Duration) {
self.timer.park_timeout(duration).unwrap();
}
/// Advance the `MockClock` by the provided duration.
pub(crate) fn advance(&mut self, duration: Duration) {
let now = Instant::now();
let end = now + duration;
while Instant::now() < end {
self.turn_for(end - Instant::now());
}
}
/// Returns the total amount of time the time has been advanced.
pub(crate) fn advanced(&self) -> Duration {
self.clock.advanced()
}
/// Get the currently mocked time
pub(crate) fn now(&mut self) -> Instant {
self.time.now()
}
/// Turn the internal timer once, but force "parking" for `duration` regardless of any pending
/// timeouts
pub(crate) fn park_for(&mut self, duration: Duration) {
self.time.inner.lock().unwrap().park_for = Some(duration);
self.turn()
}
}
impl MockTime {
pub(crate) fn new(clock: Clock) -> MockTime {
let state = State {
clock,
unparked: false,
park_for: None,
};
MockTime {
inner: Arc::new(Mutex::new(state)),
_pd: PhantomData,
}
}
pub(crate) fn mock_park(&self) -> MockPark {
let inner = self.inner.clone();
MockPark {
inner,
_pd: PhantomData,
}
}
pub(crate) fn now(&self) -> Instant {
Instant::now()
}
}
impl State {}
impl Park for MockPark {
type Unpark = MockUnpark;
type Error = ();
fn unpark(&self) -> Self::Unpark {
let inner = self.inner.clone();
MockUnpark { inner }
}
fn park(&mut self) -> Result<(), Self::Error> {
let mut inner = self.inner.lock().map_err(|_| ())?;
let duration = inner.park_for.take().expect("call park_for first");
inner.clock.advance(duration);
Ok(())
}
fn park_timeout(&mut self, duration: Duration) -> Result<(), Self::Error> {
let mut inner = self.inner.lock().unwrap();
if let Some(duration) = inner.park_for.take() {
inner.clock.advance(duration);
} else {
inner.clock.advance(duration);
}
Ok(())
}
}
impl Unpark for MockUnpark {
fn unpark(&self) {
if let Ok(mut inner) = self.inner.lock() {
inner.unparked = true;
}
}
}
|
