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
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
// Copyright 2017-2019 Parity Technologies (UK) Ltd.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

//! Implementation of the libp2p `Transport` trait for Websockets.

pub mod error;
pub mod framed;
pub mod tls;

use error::Error;
use framed::Connection;
use futures::{future::BoxFuture, prelude::*, stream::BoxStream, ready};
use libp2p_core::{
    ConnectedPoint,
    Transport,
    multiaddr::Multiaddr,
    transport::{map::{MapFuture, MapStream}, ListenerEvent, TransportError}
};
use rw_stream_sink::RwStreamSink;
use std::{io, pin::Pin, task::{Context, Poll}};

/// A Websocket transport.
#[derive(Debug, Clone)]
pub struct WsConfig<T> {
    transport: framed::WsConfig<T>
}

impl<T> WsConfig<T> {
    /// Create a new websocket transport based on the given transport.
    pub fn new(transport: T) -> Self {
        framed::WsConfig::new(transport).into()
    }

    /// Return the configured maximum number of redirects.
    pub fn max_redirects(&self) -> u8 {
        self.transport.max_redirects()
    }

    /// Set max. number of redirects to follow.
    pub fn set_max_redirects(&mut self, max: u8) -> &mut Self {
        self.transport.set_max_redirects(max);
        self
    }

    /// Get the max. frame data size we support.
    pub fn max_data_size(&self) -> usize {
        self.transport.max_data_size()
    }

    /// Set the max. frame data size we support.
    pub fn set_max_data_size(&mut self, size: usize) -> &mut Self {
        self.transport.set_max_data_size(size);
        self
    }

    /// Set the TLS configuration if TLS support is desired.
    pub fn set_tls_config(&mut self, c: tls::Config) -> &mut Self {
        self.transport.set_tls_config(c);
        self
    }

    /// Should the deflate extension (RFC 7692) be used if supported?
    pub fn use_deflate(&mut self, flag: bool) -> &mut Self {
        self.transport.use_deflate(flag);
        self
    }
}

impl<T> From<framed::WsConfig<T>> for WsConfig<T> {
    fn from(framed: framed::WsConfig<T>) -> Self {
        WsConfig {
            transport: framed
        }
    }
}

impl<T> Transport for WsConfig<T>
where
    T: Transport + Send + Clone + 'static,
    T::Error: Send + 'static,
    T::Dial: Send + 'static,
    T::Listener: Send + 'static,
    T::ListenerUpgrade: Send + 'static,
    T::Output: AsyncRead + AsyncWrite + Unpin + Send + 'static
{
    type Output = RwStreamSink<BytesConnection<T::Output>>;
    type Error = Error<T::Error>;
    type Listener = MapStream<InnerStream<T::Output, T::Error>, WrapperFn<T::Output>>;
    type ListenerUpgrade = MapFuture<InnerFuture<T::Output, T::Error>, WrapperFn<T::Output>>;
    type Dial = MapFuture<InnerFuture<T::Output, T::Error>, WrapperFn<T::Output>>;

    fn listen_on(self, addr: Multiaddr) -> Result<Self::Listener, TransportError<Self::Error>> {
        self.transport.map(wrap_connection as WrapperFn<T::Output>).listen_on(addr)
    }

    fn dial(self, addr: Multiaddr) -> Result<Self::Dial, TransportError<Self::Error>> {
        self.transport.map(wrap_connection as WrapperFn<T::Output>).dial(addr)
    }

    fn address_translation(&self, server: &Multiaddr, observed: &Multiaddr) -> Option<Multiaddr> {
        self.transport.address_translation(server, observed)
    }
}

/// Type alias corresponding to `framed::WsConfig::Listener`.
pub type InnerStream<T, E> = BoxStream<'static, Result<ListenerEvent<InnerFuture<T, E>, Error<E>>, Error<E>>>;

/// Type alias corresponding to `framed::WsConfig::Dial` and `framed::WsConfig::ListenerUpgrade`.
pub type InnerFuture<T, E> = BoxFuture<'static, Result<Connection<T>, Error<E>>>;

/// Function type that wraps a websocket connection (see. `wrap_connection`).
pub type WrapperFn<T> = fn(Connection<T>, ConnectedPoint) -> RwStreamSink<BytesConnection<T>>;

/// Wrap a websocket connection producing data frames into a `RwStreamSink`
/// implementing `AsyncRead` + `AsyncWrite`.
fn wrap_connection<T>(c: Connection<T>, _: ConnectedPoint) -> RwStreamSink<BytesConnection<T>>
where
    T: AsyncRead + AsyncWrite + Send + Unpin + 'static
{
    RwStreamSink::new(BytesConnection(c))
}

/// The websocket connection.
#[derive(Debug)]
pub struct BytesConnection<T>(Connection<T>);

impl<T> Stream for BytesConnection<T>
where
    T: AsyncRead + AsyncWrite + Send + Unpin + 'static
{
    type Item = io::Result<Vec<u8>>;

    fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
        loop {
            if let Some(item) = ready!(self.0.try_poll_next_unpin(cx)?) {
                if item.is_data() {
                    return Poll::Ready(Some(Ok(item.into_bytes())))
                }
            } else {
                return Poll::Ready(None)
            }
        }
    }
}

impl<T> Sink<Vec<u8>> for BytesConnection<T>
where
    T: AsyncRead + AsyncWrite + Send + Unpin + 'static
{
    type Error = io::Error;

    fn poll_ready(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
        Pin::new(&mut self.0).poll_ready(cx)
    }

    fn start_send(mut self: Pin<&mut Self>, item: Vec<u8>) -> io::Result<()> {
        Pin::new(&mut self.0).start_send(framed::OutgoingData::Binary(item))
    }

    fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
        Pin::new(&mut self.0).poll_flush(cx)
    }

    fn poll_close(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
        Pin::new(&mut self.0).poll_close(cx)
    }
}

// Tests //////////////////////////////////////////////////////////////////////////////////////////

#[cfg(test)]
mod tests {
    use libp2p_core::Multiaddr;
    use libp2p_tcp as tcp;
    use futures::prelude::*;
    use libp2p_core::{Transport, multiaddr::Protocol};
    use super::WsConfig;

    #[test]
    fn dialer_connects_to_listener_ipv4() {
        let a = "/ip4/127.0.0.1/tcp/0/ws".parse().unwrap();
        futures::executor::block_on(connect(a))
    }

    #[test]
    fn dialer_connects_to_listener_ipv6() {
        let a = "/ip6/::1/tcp/0/ws".parse().unwrap();
        futures::executor::block_on(connect(a))
    }

    async fn connect(listen_addr: Multiaddr) {
        let ws_config = WsConfig::new(tcp::TcpConfig::new());

        let mut listener = ws_config.clone()
            .listen_on(listen_addr)
            .expect("listener");

        let addr = listener.try_next().await
            .expect("some event")
            .expect("no error")
            .into_new_address()
            .expect("listen address");

        assert_eq!(Some(Protocol::Ws("/".into())), addr.iter().nth(2));
        assert_ne!(Some(Protocol::Tcp(0)), addr.iter().nth(1));

        let inbound = async move {
            let (conn, _addr) = listener.try_filter_map(|e| future::ready(Ok(e.into_upgrade())))
                .try_next()
                .await
                .unwrap()
                .unwrap();
            conn.await
        };

        let outbound = ws_config.dial(addr).unwrap();

        let (a, b) = futures::join!(inbound, outbound);
        a.and(b).unwrap();
    }
}