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#![allow(deprecated)]
use Delay;
use futures::{Async, Future, Poll};
use std::error;
use std::fmt;
use std::time::Instant;
#[deprecated(since = "0.2.6", note = "use Timeout instead")]
#[doc(hidden)]
#[derive(Debug)]
pub struct Deadline<T> {
future: T,
delay: Delay,
}
#[deprecated(since = "0.2.6", note = "use Timeout instead")]
#[doc(hidden)]
#[derive(Debug)]
pub struct DeadlineError<T>(Kind<T>);
/// Deadline error variants
#[derive(Debug)]
enum Kind<T> {
/// Inner future returned an error
Inner(T),
/// The deadline elapsed.
Elapsed,
/// Timer returned an error.
Timer(::Error),
}
impl<T> Deadline<T> {
/// Create a new `Deadline` that completes when `future` completes or when
/// `deadline` is reached.
pub fn new(future: T, deadline: Instant) -> Deadline<T> {
Deadline::new_with_delay(future, Delay::new(deadline))
}
pub(crate) fn new_with_delay(future: T, delay: Delay) -> Deadline<T> {
Deadline { future, delay }
}
/// Gets a reference to the underlying future in this deadline.
pub fn get_ref(&self) -> &T {
&self.future
}
/// Gets a mutable reference to the underlying future in this deadline.
pub fn get_mut(&mut self) -> &mut T {
&mut self.future
}
/// Consumes this deadline, returning the underlying future.
pub fn into_inner(self) -> T {
self.future
}
}
impl<T> Future for Deadline<T>
where
T: Future,
{
type Item = T::Item;
type Error = DeadlineError<T::Error>;
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
// First, try polling the future
match self.future.poll() {
Ok(Async::Ready(v)) => return Ok(Async::Ready(v)),
Ok(Async::NotReady) => {}
Err(e) => return Err(DeadlineError::inner(e)),
}
// Now check the timer
match self.delay.poll() {
Ok(Async::NotReady) => Ok(Async::NotReady),
Ok(Async::Ready(_)) => Err(DeadlineError::elapsed()),
Err(e) => Err(DeadlineError::timer(e)),
}
}
}
// ===== impl DeadlineError =====
impl<T> DeadlineError<T> {
/// Create a new `DeadlineError` representing the inner future completing
/// with `Err`.
pub fn inner(err: T) -> DeadlineError<T> {
DeadlineError(Kind::Inner(err))
}
/// Returns `true` if the error was caused by the inner future completing
/// with `Err`.
pub fn is_inner(&self) -> bool {
match self.0 {
Kind::Inner(_) => true,
_ => false,
}
}
/// Consumes `self`, returning the inner future error.
pub fn into_inner(self) -> Option<T> {
match self.0 {
Kind::Inner(err) => Some(err),
_ => None,
}
}
/// Create a new `DeadlineError` representing the inner future not
/// completing before the deadline is reached.
pub fn elapsed() -> DeadlineError<T> {
DeadlineError(Kind::Elapsed)
}
/// Returns `true` if the error was caused by the inner future not
/// completing before the deadline is reached.
pub fn is_elapsed(&self) -> bool {
match self.0 {
Kind::Elapsed => true,
_ => false,
}
}
/// Creates a new `DeadlineError` representing an error encountered by the
/// timer implementation
pub fn timer(err: ::Error) -> DeadlineError<T> {
DeadlineError(Kind::Timer(err))
}
/// Returns `true` if the error was caused by the timer.
pub fn is_timer(&self) -> bool {
match self.0 {
Kind::Timer(_) => true,
_ => false,
}
}
/// Consumes `self`, returning the error raised by the timer implementation.
pub fn into_timer(self) -> Option<::Error> {
match self.0 {
Kind::Timer(err) => Some(err),
_ => None,
}
}
}
impl<T: error::Error> error::Error for DeadlineError<T> {
fn description(&self) -> &str {
use self::Kind::*;
match self.0 {
Inner(ref e) => e.description(),
Elapsed => "deadline has elapsed",
Timer(ref e) => e.description(),
}
}
}
impl<T: fmt::Display> fmt::Display for DeadlineError<T> {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
use self::Kind::*;
match self.0 {
Inner(ref e) => e.fmt(fmt),
Elapsed => "deadline has elapsed".fmt(fmt),
Timer(ref e) => e.fmt(fmt),
}
}
}