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use futures::{Async, Poll};
use actor::Actor;
use fut::ActorFuture;
#[derive(Debug)]
#[must_use = "futures do nothing unless polled"]
pub struct MapErr<A, F> where A: ActorFuture {
future: A,
f: Option<F>,
}
pub fn new<A, F>(future: A, f: F) -> MapErr<A, F> where A: ActorFuture
{
MapErr {
future: future,
f: Some(f),
}
}
impl<U, A, F> ActorFuture for MapErr<A, F>
where A: ActorFuture,
F: FnOnce(A::Error, &mut A::Actor, &mut <A::Actor as Actor>::Context) -> U,
{
type Item = A::Item;
type Error = U;
type Actor = A::Actor;
fn poll(&mut self,
act: &mut A::Actor,
ctx: &mut <A::Actor as Actor>::Context) -> Poll<A::Item, U>
{
let e = match self.future.poll(act, ctx) {
Ok(Async::NotReady) => return Ok(Async::NotReady),
other => other,
};
match e {
Err(e) =>
Err(self.f.take().expect("cannot poll MapErr twice")(e, act, ctx)),
Ok(err) => Ok(err)
}
}
}
pub struct DropErr<A> where A: ActorFuture {
future: A
}
impl<A>DropErr<A> where A: ActorFuture {
pub(crate) fn new(future: A) -> DropErr<A>
{
DropErr {
future: future,
}
}
}
impl<A> ActorFuture for DropErr<A>
where A: ActorFuture
{
type Item = A::Item;
type Error = ();
type Actor = A::Actor;
fn poll(&mut self,
act: &mut A::Actor,
ctx: &mut <A::Actor as Actor>::Context) -> Poll<A::Item, ()>
{
match self.future.poll(act, ctx) {
Ok(Async::Ready(item)) => Ok(Async::Ready(item)),
Ok(Async::NotReady) => Ok(Async::NotReady),
Err(_) => Err(()),
}
}
}