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#![deny(missing_docs)]
extern crate futures;
#[cfg(not(feature="silence"))]
#[macro_use]
extern crate log;
use futures::{Future, Poll};
use std::fmt::Debug;
#[derive(Debug)]
pub struct LoggedFuture<T, E, F: Future<Item = T, Error = E>> {
future: F,
label: String,
}
#[cfg(not(feature="silence"))]
impl<T, E, F> Future for LoggedFuture<T, E, F>
where T: Debug,
E: Debug,
F: Future<Item = T, Error = E>
{
type Item = F::Item;
type Error = F::Error;
#[inline]
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
debug!(target: "futures_log", "Polling future `{}'", self.label);
let poll = self.future.poll();
debug!(target: "futures_log", "Future `{}' polled: {:?}", self.label, poll);
poll
}
}
#[cfg(feature="silence")]
impl<T, E, F> Future for LoggedFuture<T, E, F>
where T: Debug,
E: Debug,
F: Future<Item = T, Error = E>
{
type Item = F::Item;
type Error = F::Error;
#[inline]
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
self.future.poll()
}
}
pub trait LoggingExt<T, E>
where T: Debug,
E: Debug,
Self: Future<Item = T, Error = E> + Sized
{
#[cfg(not(feature="silence"))]
fn inspect(self, label: &str) -> LoggedFuture<T, E, Self>;
#[cfg(feature="silence")]
fn inspect(self, label: &str) -> Self;
}
impl<T, E, F> LoggingExt<T, E> for F
where T: Debug,
E: Debug,
Self: Future<Item = T, Error = E>
{
#[cfg(not(feature="silence"))]
fn inspect(self, label: &str) -> LoggedFuture<T, E, Self> {
LoggedFuture {
future: self,
label: label.to_owned(),
}
}
#[cfg(feature="silence")]
fn inspect(self, _: &str) -> Self {
self
}
}