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use tokio_executor::park::{Park, Unpark};
use tokio_timer::clock::{Clock, Now};
use tokio_timer::Timer;
use std::marker::PhantomData;
use std::rc::Rc;
use std::sync::{Arc, Mutex};
use std::time::{Duration, Instant};
pub fn mock<F, R>(f: F) -> R
where
F: FnOnce(&mut Handle) -> R,
{
let mut mock = MockClock::new();
mock.enter(f)
}
pub fn mock_at<F, R>(instant: Instant, f: F) -> R
where
F: FnOnce(&mut Handle) -> R,
{
let mut mock = MockClock::with_instant(instant);
mock.enter(f)
}
#[derive(Debug)]
pub struct MockClock {
time: MockTime,
clock: Clock,
}
#[derive(Debug)]
pub struct Handle {
timer: Timer<MockPark>,
time: MockTime,
}
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 {
base: Instant,
advance: Duration,
unparked: bool,
park_for: Option<Duration>,
}
impl MockClock {
pub fn new() -> Self {
MockClock::with_instant(Instant::now())
}
pub fn with_duration(duration: Duration) -> Self {
let instant = Instant::now() + duration;
MockClock::with_instant(instant)
}
pub fn with_instant(instant: Instant) -> Self {
let time = MockTime::new(instant);
let clock = Clock::new_with_now(time.mock_now());
MockClock { time, clock }
}
pub fn enter<F, R>(&mut self, f: F) -> R
where
F: FnOnce(&mut Handle) -> R,
{
::tokio_timer::clock::with_default(&self.clock, || {
let park = self.time.mock_park();
let timer = Timer::new(park);
let handle = timer.handle();
let time = self.time.clone();
let _timer = ::tokio_timer::set_default(&handle);
let mut handle = Handle::new(timer, time);
f(&mut handle)
})
}
}
impl Default for MockClock {
fn default() -> Self {
Self::new()
}
}
impl Handle {
pub(self) fn new(timer: Timer<MockPark>, time: MockTime) -> Self {
Handle { timer, time }
}
pub fn turn(&mut self) {
self.timer.turn(None).unwrap();
}
pub fn turn_for(&mut self, duration: Duration) {
self.timer.turn(Some(duration)).unwrap();
}
pub fn advance(&mut self, duration: Duration) {
let inner = self.timer.get_park().inner.clone();
let deadline = inner.lock().unwrap().now() + duration;
while inner.lock().unwrap().now() < deadline {
let dur = deadline - inner.lock().unwrap().now();
self.turn_for(dur);
}
}
pub fn advanced(&self) -> Duration {
self.time.inner.lock().unwrap().advance
}
pub fn now(&mut self) -> Instant {
self.time.now()
}
pub fn park_for(&mut self, duration: Duration) {
self.time.inner.lock().unwrap().park_for = Some(duration);
self.turn()
}
}
impl MockTime {
pub(crate) fn new(now: Instant) -> MockTime {
let state = State {
base: now,
advance: Duration::default(),
unparked: false,
park_for: None,
};
MockTime {
inner: Arc::new(Mutex::new(state)),
_pd: PhantomData,
}
}
pub(crate) fn mock_now(&self) -> MockNow {
let inner = self.inner.clone();
MockNow { inner }
}
pub(crate) fn mock_park(&self) -> MockPark {
let inner = self.inner.clone();
MockPark {
inner,
_pd: PhantomData,
}
}
pub(crate) fn now(&self) -> Instant {
self.inner.lock().unwrap().now()
}
}
impl State {
fn now(&self) -> Instant {
self.base + self.advance
}
fn advance(&mut self, duration: Duration) {
self.advance += duration;
}
}
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.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.advance(duration);
} else {
inner.advance(duration);
}
Ok(())
}
}
impl Unpark for MockUnpark {
fn unpark(&self) {
if let Ok(mut inner) = self.inner.lock() {
inner.unparked = true;
}
}
}
impl Now for MockNow {
fn now(&self) -> Instant {
self.inner.lock().unwrap().now()
}
}