1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144

extern crate futures;
extern crate tokio_core;
extern crate tokio_io;
extern crate tokio_service;
extern crate tokio_io_timeout;
extern crate hyper;

use std::time::Duration;
use std::io;

use futures::future::{Either, Future};

use tokio_core::reactor::{Handle, Timeout};
use tokio_io::{AsyncRead, AsyncWrite};
use tokio_service::Service;
use tokio_io_timeout::TimeoutStream;

use hyper::client::Connect;

/// A connector that enforces as connection timeout
#[derive(Debug)]
pub struct TimeoutConnector<T> {
    /// A connector implementing the `Connect` trait
    connector: T,
    /// Handle to be used to set the timeout within tokio's core
    handle: Handle,
    /// Amount of time to wait connecting
    connect_timeout: Option<Duration>,
    /// Amount of time to wait reading response
    read_timeout: Option<Duration>,
    /// Amount of time to wait writing request
    write_timeout: Option<Duration>,
}

impl<T: Connect> TimeoutConnector<T> {
    /// Construct a new TimeoutConnector with a given connector implementing the `Connect` trait
    pub fn new(connector: T, handle: &Handle) -> Self {
        TimeoutConnector {
            connector: connector,
            handle: handle.clone(),
            connect_timeout: None,
            read_timeout: None,
            write_timeout: None,
        }
    }

    /// Set the timeout for connecting to a URL.
    ///
    /// Default is no timeout.
    #[inline]
    pub fn set_connect_timeout(&mut self, val: Option<Duration>) {
        self.connect_timeout = val;
    }

    /// Set the timeout for the response.
    ///
    /// Default is no timeout.
    #[inline]
    pub fn set_read_timeout(&mut self, val: Option<Duration>) {
        self.read_timeout = val;
    }

    /// Set the timeout for the request.
    ///
    /// Default is no timeout.
    #[inline]
    pub fn set_write_timeout(&mut self, val: Option<Duration>) {
        self.write_timeout = val;
    }
}

impl<T> Service for TimeoutConnector<T>
where
    T: Service<Error = io::Error> + 'static,
    T::Response: AsyncRead + AsyncWrite,
    T::Future: Future<Error = io::Error>,
{
    type Request = T::Request;
    type Response = TimeoutStream<T::Response>;
    type Error = T::Error;
    type Future = Box<Future<Item = Self::Response, Error = Self::Error>>;

    fn call(&self, req: Self::Request) -> Self::Future {
        let handle = self.handle.clone();
        let read_timeout = self.read_timeout.clone();
        let write_timeout = self.write_timeout.clone();
        let connecting = self.connector.call(req);

        if self.connect_timeout.is_none() {
            return Box::new(connecting.map(move |io| {
                let mut tm = TimeoutStream::new(io, &handle);
                tm.set_read_timeout(read_timeout);
                tm.set_write_timeout(write_timeout);
                tm
            }));
        }

        let connect_timeout = self.connect_timeout.expect("Connect timeout should be set");
        let timeout = Timeout::new(connect_timeout, &self.handle).unwrap();

        Box::new(connecting.select2(timeout).then(move |res| match res {
            Ok(Either::A((io, _))) => {
                let mut tm = TimeoutStream::new(io, &handle);
                tm.set_read_timeout(read_timeout);
                tm.set_write_timeout(write_timeout);
                Ok(tm)
            }
            Ok(Either::B((_, _))) => {
                Err(io::Error::new(
                    io::ErrorKind::TimedOut,
                    "Client timed out while connecting",
                ))
            }
            Err(Either::A((e, _))) => Err(e),
            Err(Either::B((e, _))) => Err(e),
        }))
    }
}

#[cfg(test)]
mod tests {
    use std::io;
    use std::time::Duration;
    use tokio_core::reactor::Core;
    use hyper::client::{Connect, HttpConnector};
    use super::TimeoutConnector;

    #[test]
    fn test_timeout_connector() {
        let mut core = Core::new().unwrap();
        // 10.255.255.1 is a not a routable IP address
        let url = "http://10.255.255.1".parse().unwrap();
        let mut connector =
            TimeoutConnector::new(HttpConnector::new(1, &core.handle()), &core.handle());
        connector.set_connect_timeout(Some(Duration::from_millis(1)));

        match core.run(connector.connect(url)) {
            Err(e) => {
                assert_eq!(e.kind(), io::ErrorKind::TimedOut);
            }
            _ => panic!("Expected timeout error"),
        }
    }
}