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
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
use std::future::Future;
use std::io;
use std::pin::Pin;
use std::task::{Context, Poll};
use std::time::Duration;

use tokio::io::{AsyncRead, AsyncWrite};
use tokio::time::timeout;
use tokio_io_timeout::TimeoutStream;

use hyper::client::connect::{Connected, Connection};
use hyper::{service::Service, Uri};

mod stream;

use stream::TimeoutConnectorStream;

type BoxError = Box<dyn std::error::Error + Send + Sync>;

/// A connector that enforces as connection timeout
#[derive(Debug, Clone)]
pub struct TimeoutConnector<T> {
    /// A connector implementing the `Connect` trait
    connector: T,
    /// 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> TimeoutConnector<T>
where
    T: Service<Uri> + Send,
    T::Response: AsyncRead + AsyncWrite + Send + Unpin,
    T::Future: Send + 'static,
    T::Error: Into<BoxError>,
{
    /// Construct a new TimeoutConnector with a given connector implementing the `Connect` trait
    pub fn new(connector: T) -> Self {
        TimeoutConnector {
            connector,
            connect_timeout: None,
            read_timeout: None,
            write_timeout: None,
        }
    }
}

impl<T> Service<Uri> for TimeoutConnector<T>
where
    T: Service<Uri> + Send,
    T::Response: AsyncRead + AsyncWrite + Connection + Send + Unpin,
    T::Future: Send + 'static,
    T::Error: Into<BoxError>,
{
    type Response = Pin<Box<TimeoutConnectorStream<T::Response>>>;
    type Error = BoxError;
    #[allow(clippy::type_complexity)]
    type Future = Pin<Box<dyn Future<Output = Result<Self::Response, Self::Error>> + Send>>;

    fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
        self.connector.poll_ready(cx).map_err(Into::into)
    }

    fn call(&mut self, dst: Uri) -> Self::Future {
        let connect_timeout = self.connect_timeout;
        let read_timeout = self.read_timeout;
        let write_timeout = self.write_timeout;
        let connecting = self.connector.call(dst);

        let fut = async move {
            let stream = match connect_timeout {
                None => {
                    let io = connecting.await.map_err(Into::into)?;
                    TimeoutStream::new(io)
                }
                Some(connect_timeout) => {
                    let timeout = timeout(connect_timeout, connecting);
                    let connecting = timeout
                        .await
                        .map_err(|e| io::Error::new(io::ErrorKind::TimedOut, e))?;
                    let io = connecting.map_err(Into::into)?;
                    TimeoutStream::new(io)
                }
            };

            let mut tm = TimeoutConnectorStream::new(stream);
            tm.set_read_timeout(read_timeout);
            tm.set_write_timeout(write_timeout);
            Ok(Box::pin(tm))
        };

        Box::pin(fut)
    }
}

impl<T> TimeoutConnector<T> {
    /// 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> Connection for TimeoutConnector<T>
where
    T: AsyncRead + AsyncWrite + Connection + Service<Uri> + Send + Unpin,
    T::Response: AsyncRead + AsyncWrite + Send + Unpin,
    T::Future: Send + 'static,
    T::Error: Into<BoxError>,
{
    fn connected(&self) -> Connected {
        self.connector.connected()
    }
}

#[cfg(test)]
mod tests {
    use std::error::Error;
    use std::io;
    use std::time::Duration;

    use hyper::client::HttpConnector;
    use hyper::Client;

    use super::TimeoutConnector;

    #[tokio::test]
    async fn test_timeout_connector() {
        // 10.255.255.1 is a not a routable IP address
        let url = "http://10.255.255.1".parse().unwrap();

        let http = HttpConnector::new();
        let mut connector = TimeoutConnector::new(http);
        connector.set_connect_timeout(Some(Duration::from_millis(1)));

        let client = Client::builder().build::<_, hyper::Body>(connector);

        let res = client.get(url).await;

        match res {
            Ok(_) => panic!("Expected a timeout"),
            Err(e) => {
                if let Some(io_e) = e.source().unwrap().downcast_ref::<io::Error>() {
                    assert_eq!(io_e.kind(), io::ErrorKind::TimedOut);
                } else {
                    panic!("Expected timeout error");
                }
            }
        }
    }

    #[tokio::test]
    async fn test_read_timeout() {
        let url = "http://example.com".parse().unwrap();

        let http = HttpConnector::new();
        let mut connector = TimeoutConnector::new(http);
        // A 1 ms read timeout should be so short that we trigger a timeout error
        connector.set_read_timeout(Some(Duration::from_millis(1)));

        let client = Client::builder().build::<_, hyper::Body>(connector);

        let res = client.get(url).await;

        match res {
            Ok(_) => panic!("Expected a timeout"),
            Err(e) => {
                if let Some(io_e) = e.source().unwrap().downcast_ref::<io::Error>() {
                    assert_eq!(io_e.kind(), io::ErrorKind::TimedOut);
                } else {
                    panic!("Expected timeout error");
                }
            }
        }
    }
}