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#![doc(html_root_url = "https://docs.rs/tower-timeout/0.3.0")]
#![warn(
    missing_debug_implementations,
    missing_docs,
    rust_2018_idioms,
    unreachable_pub
)]

//! Tower middleware that applies a timeout to requests.
//!
//! If the response does not complete within the specified timeout, the response
//! will be aborted.

pub mod error;
pub mod future;
mod layer;

pub use crate::layer::TimeoutLayer;

use crate::{error::Error, future::ResponseFuture};
use std::task::{Context, Poll};
use std::time::Duration;
use tower_service::Service;

/// Applies a timeout to requests.
#[derive(Debug, Clone)]
pub struct Timeout<T> {
    inner: T,
    timeout: Duration,
}

// ===== impl Timeout =====

impl<T> Timeout<T> {
    /// Creates a new Timeout
    pub fn new(inner: T, timeout: Duration) -> Self {
        Timeout { inner, timeout }
    }
}

impl<S, Request> Service<Request> for Timeout<S>
where
    S: Service<Request>,
    S::Error: Into<Error>,
{
    type Response = S::Response;
    type Error = Error;
    type Future = ResponseFuture<S::Future>;

    fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
        match self.inner.poll_ready(cx) {
            Poll::Pending => Poll::Pending,
            Poll::Ready(r) => Poll::Ready(r.map_err(Into::into)),
        }
    }

    fn call(&mut self, request: Request) -> Self::Future {
        let response = self.inner.call(request);
        let sleep = tokio::time::delay_for(self.timeout);

        ResponseFuture::new(response, sleep)
    }
}