tet_libp2p_core/transport/
choice.rs

1// Copyright 2017 Parity Technologies (UK) Ltd.
2//
3// Permission is hereby granted, free of charge, to any person obtaining a
4// copy of this software and associated documentation files (the "Software"),
5// to deal in the Software without restriction, including without limitation
6// the rights to use, copy, modify, merge, publish, distribute, sublicense,
7// and/or sell copies of the Software, and to permit persons to whom the
8// Software is furnished to do so, subject to the following conditions:
9//
10// The above copyright notice and this permission notice shall be included in
11// all copies or substantial portions of the Software.
12//
13// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
14// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
17// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
18// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
19// DEALINGS IN THE SOFTWARE.
20
21use crate::either::{EitherListenStream, EitherOutput, EitherError, EitherFuture};
22use crate::transport::{Transport, TransportError};
23use multiaddr::Multiaddr;
24
25/// Struct returned by `or_transport()`.
26#[derive(Debug, Copy, Clone)]
27pub struct OrTransport<A, B>(A, B);
28
29impl<A, B> OrTransport<A, B> {
30    pub fn new(a: A, b: B) -> OrTransport<A, B> {
31        OrTransport(a, b)
32    }
33}
34
35impl<A, B> Transport for OrTransport<A, B>
36where
37    B: Transport,
38    A: Transport,
39{
40    type Output = EitherOutput<A::Output, B::Output>;
41    type Error = EitherError<A::Error, B::Error>;
42    type Listener = EitherListenStream<A::Listener, B::Listener>;
43    type ListenerUpgrade = EitherFuture<A::ListenerUpgrade, B::ListenerUpgrade>;
44    type Dial = EitherFuture<A::Dial, B::Dial>;
45
46    fn listen_on(self, addr: Multiaddr) -> Result<Self::Listener, TransportError<Self::Error>> {
47        let addr = match self.0.listen_on(addr) {
48            Ok(listener) => return Ok(EitherListenStream::First(listener)),
49            Err(TransportError::MultiaddrNotSupported(addr)) => addr,
50            Err(TransportError::Other(err)) => return Err(TransportError::Other(EitherError::A(err))),
51        };
52
53        let addr = match self.1.listen_on(addr) {
54            Ok(listener) => return Ok(EitherListenStream::Second(listener)),
55            Err(TransportError::MultiaddrNotSupported(addr)) => addr,
56            Err(TransportError::Other(err)) => return Err(TransportError::Other(EitherError::B(err))),
57        };
58
59        Err(TransportError::MultiaddrNotSupported(addr))
60    }
61
62    fn dial(self, addr: Multiaddr) -> Result<Self::Dial, TransportError<Self::Error>> {
63        let addr = match self.0.dial(addr) {
64            Ok(connec) => return Ok(EitherFuture::First(connec)),
65            Err(TransportError::MultiaddrNotSupported(addr)) => addr,
66            Err(TransportError::Other(err)) => return Err(TransportError::Other(EitherError::A(err))),
67        };
68
69        let addr = match self.1.dial(addr) {
70            Ok(connec) => return Ok(EitherFuture::Second(connec)),
71            Err(TransportError::MultiaddrNotSupported(addr)) => addr,
72            Err(TransportError::Other(err)) => return Err(TransportError::Other(EitherError::B(err))),
73        };
74
75        Err(TransportError::MultiaddrNotSupported(addr))
76    }
77
78    fn address_translation(&self, server: &Multiaddr, observed: &Multiaddr) -> Option<Multiaddr> {
79        if let Some(addr) = self.0.address_translation(server, observed) {
80            Some(addr)
81        } else {
82            self.1.address_translation(server, observed)
83        }
84    }
85}
tet_libp2p_core/transport/choice.rs

tet_libp2p_core/transport/
choice.rs
