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

use std::net::SocketAddr;
use std::sync::Arc;

use futures::{Async, Future, Poll};
use hyper::{rt, Server as HyperServer};
use hyper::service::{service_fn};

use ::never::Never;
use ::reject::Reject;
use ::reply::{ReplySealed, Reply};
use ::Request;

/// Create a `Server` with the provided service.
pub fn serve<S>(service: S) -> Server<S>
where
    S: IntoWarpService + 'static,
{
    Server {
        pipeline: false,
        service,
    }
}

/// A Warp Server ready to filter requests.
#[derive(Debug)]
pub struct Server<S> {
    pipeline: bool,
    service: S,
}

// Getting all various generic bounds to make this a re-usable method is
// very complicated, so instead this is just a macro.
macro_rules! bind_inner {
    ($this:ident, $addr:expr) => ({
        let inner = Arc::new($this.service.into_warp_service());
        let service = move || {
            let inner = inner.clone();
            service_fn(move |req| {
                ReplyFuture {
                    inner: inner.call(req)
                }
            })
        };
        let srv = HyperServer::bind(&$addr.into())
            .http1_pipeline_flush($this.pipeline)
            .serve(service);
        let addr = srv.local_addr();
        (addr, srv)
    });
}

impl<S> Server<S>
where
    S: IntoWarpService + 'static,
    <<S::Service as WarpService>::Reply as Future>::Item: Reply + Send,
    <<S::Service as WarpService>::Reply as Future>::Error: Reject + Send,
{
    /// Run this `Server` forever on the current thread.
    pub fn run(self, addr: impl Into<SocketAddr> + 'static) {
        let (addr, fut) = self.bind_ephemeral(addr);

        info!("warp drive engaged: listening on {}", addr);

        rt::run(fut);
    }

    /// Bind to a socket address, returning a `Future` that can be
    /// executed on any runtime.
    pub fn bind(self, addr: impl Into<SocketAddr> + 'static) -> impl Future<Item=(), Error=()> + 'static {
        let (_, fut) = self.bind_ephemeral(addr);
        fut
    }

    /// Bind to a possibly ephemeral socket address.
    ///
    /// Returns the bound address and a `Future` that can be executed on
    /// any runtime.
    pub fn bind_ephemeral(self, addr: impl Into<SocketAddr> + 'static) -> (SocketAddr, impl Future<Item=(), Error=()> + 'static) {
        let (addr, srv) = bind_inner!(self, addr);
        (addr, srv.map_err(|e| error!("server error: {}", e)))
    }

    /// Create a server with graceful shutdown signal.
    ///
    /// When the signal completes, the server will start the graceful shutdown
    /// process.
    ///
    /// Returns the bound address and a `Future` that can be executed on
    /// any runtime.
    ///
    /// # Example
    ///
    /// ```no_run
    /// extern crate futures;
    /// extern crate warp;
    ///
    /// use futures::sync::oneshot;
    /// use warp::Filter;
    ///
    /// # fn main() {
    /// let routes = warp::any()
    ///     .map(|| "Hello, World!");
    ///
    /// let (tx, rx) = oneshot::channel();
    ///
    /// let (addr, server) = warp::serve(routes)
    ///     .bind_with_graceful_shutdown(([127, 0, 0, 1], 3030), rx);
    ///
    /// // Spawn the server into a runtime
    /// warp::spawn(server);
    ///
    /// // Later, start the shutdown...
    /// let _ = tx.send(());
    /// # }
    /// ```
    pub fn bind_with_graceful_shutdown(
        self,
        addr: impl Into<SocketAddr> + 'static,
        signal: impl Future<Item=()> + Send + 'static,
    ) -> (SocketAddr, impl Future<Item=(), Error=()> + 'static) {
        let (addr, srv) = bind_inner!(self, addr);
        let fut = srv
            .with_graceful_shutdown(signal)
            .map_err(|e| error!("server error: {}", e));
        (addr, fut)
    }

    // Generally shouldn't be used, as it can slow down non-pipelined responses.
    //
    // It's only real use is to make silly pipeline benchmarks look better.
    #[doc(hidden)]
    pub fn unstable_pipeline(mut self) -> Self {
        self.pipeline = true;
        self
    }
}

pub trait IntoWarpService {
    type Service: WarpService + Send + Sync + 'static;
    fn into_warp_service(self) -> Self::Service;
}

pub trait WarpService {
    type Reply: Future + Send;
    fn call(&self, req: Request) -> Self::Reply;
}


// Optimizes better than using Future::then, since it doesn't
// have to return an IntoFuture.
#[derive(Debug)]
struct ReplyFuture<F> {
    inner: F,
}

impl<F> Future for ReplyFuture<F>
where
    F: Future,
    F::Item: Reply,
    F::Error: Reject,
{
    type Item = ::reply::Response;
    type Error = Never;

    #[inline]
    fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
        match self.inner.poll() {
            Ok(Async::Ready(ok)) => Ok(Async::Ready(ok.into_response())),
            Ok(Async::NotReady) => Ok(Async::NotReady),
            Err(err) => Ok(Async::Ready(err.into_response())),
        }
    }
}