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#![deny(missing_docs)]
extern crate futures;
extern crate time;
extern crate tokio_service;
use futures::{Async, Future, Poll};
use std::ops;
use tokio_service::Service;
pub struct Timeit<S, TimeSink> {
downstream: S,
time_sink: TimeSink,
}
impl<S, TimeSink> Timeit<S, TimeSink> {
pub fn new(service: S, time_sink: TimeSink) -> Timeit<S, TimeSink> {
Timeit {
downstream: service,
time_sink: time_sink,
}
}
}
impl<S, TimeSink, TimeSinkFn> Service for Timeit<S, TimeSink>
where S: Service,
TimeSink: ops::Deref<Target = TimeSinkFn> + Clone,
TimeSinkFn: Fn(time::Duration)
{
type Request = S::Request;
type Response = S::Response;
type Error = S::Error;
type Future = EndTimeit<S::Future, TimeSink>;
fn call(&self, request: Self::Request) -> Self::Future {
EndTimeit {
start: Some(time::now()),
time_sink: self.time_sink.clone(),
future: self.downstream.call(request),
}
}
}
#[doc(hidden)]
pub struct EndTimeit<F, TimeSink> {
start: Option<time::Tm>,
time_sink: TimeSink,
future: F,
}
impl<F, TimeSink, TimeSinkFn> Future for EndTimeit<F, TimeSink>
where F: Future,
TimeSink: ops::Deref<Target = TimeSinkFn> + Clone,
TimeSinkFn: Fn(time::Duration)
{
type Item = F::Item;
type Error = F::Error;
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
match self.future.poll() {
Ok(Async::NotReady) => return Ok(Async::NotReady),
Err(e) => Err(e),
Ok(Async::Ready(r)) => {
let start =
self.start.take().expect("Should not call poll on EndTimeit more than once");
let end = time::now();
(*self.time_sink)(end - start);
Ok(Async::Ready(r))
}
}
}
}
#[cfg(test)]
mod tests {
extern crate futures;
extern crate tokio_service;
use super::*;
use futures::{Async, Future};
use std::cell::Cell;
use std::rc::Rc;
use tokio_service::Service;
struct StubService<C> {
c: C,
}
impl<C> StubService<C> {
fn new(c: C) -> StubService<C> {
StubService { c: c }
}
}
impl<C, T, F> Service for StubService<C>
where C: Fn() -> F,
F: Future<Item = T, Error = ()> + 'static
{
type Request = ();
type Response = T;
type Error = ();
type Future = F;
fn call(&self, _: Self::Request) -> Self::Future {
(self.c)()
}
}
#[test]
fn if_downstream_returns_value_so_do_we() {
let stub = StubService::new(|| futures::done(Ok(5)));
let wrapped = Timeit::new(stub, Rc::new(|_| {}));
let mut future = wrapped.call(());
assert_eq!(future.poll(), Ok(Async::Ready(5)));
}
#[test]
fn if_downstream_does_not_return_value_time_sink_not_called() {
let stub = StubService::new(|| futures::empty::<(), ()>());
let wrapped = Timeit::new(stub, Rc::new(|_| unreachable!()));
let mut future = wrapped.call(());
assert_eq!(future.poll(), Ok(Async::NotReady));
}
#[test]
fn if_downstream_returns_value_time_sink_is_called() {
let stub = StubService::new(|| futures::done(Ok(())));
let times_called = Cell::new(0);
let wrapped = Timeit::new(stub,
Rc::new(|_| { times_called.set(times_called.get() + 1); }));
let expected_times_called = 10;
for _ in 0..expected_times_called {
let mut future = wrapped.call(());
assert_eq!(future.poll(), Ok(Async::Ready(())));
}
assert_eq!(times_called.get(), expected_times_called);
}
}