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use std::fmt::Display;
use futures::{Async, Future};
use void::Void;
use log::LogLevel;
pub struct LogError<F> {
future: F,
level: LogLevel,
description: &'static str,
}
impl<F> LogError<F> {
pub fn new(
future: F,
level: LogLevel,
description: &'static str,
) -> LogError<F> {
LogError {
future,
level,
description,
}
}
}
impl<F> Future for LogError<F>
where
F: Future<Item=()>,
F::Error: Display,
{
type Item = ();
type Error= Void;
fn poll(&mut self) -> Result<Async<()>, Void> {
match self.future.poll() {
Ok(x) => Ok(x),
Err(e) => {
log!(self.level, "{}: {}", self.description, e);
Ok(Async::Ready(()))
},
}
}
}