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