libp2p/builder/
select_muxer.rs

1// Copyright 2018 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
21#![allow(unreachable_pub)]
22
23use std::iter::{Chain, Map};
24
25use either::Either;
26use futures::future;
27use libp2p_core::{
28    either::EitherFuture,
29    upgrade::{InboundConnectionUpgrade, OutboundConnectionUpgrade},
30    UpgradeInfo,
31};
32
33#[derive(Debug, Clone)]
34pub struct SelectMuxerUpgrade<A, B>(A, B);
35
36impl<A, B> SelectMuxerUpgrade<A, B> {
37    pub fn new(a: A, b: B) -> Self {
38        SelectMuxerUpgrade(a, b)
39    }
40}
41
42impl<A, B> UpgradeInfo for SelectMuxerUpgrade<A, B>
43where
44    A: UpgradeInfo,
45    B: UpgradeInfo,
46{
47    type Info = Either<A::Info, B::Info>;
48    type InfoIter = Chain<
49        Map<<A::InfoIter as IntoIterator>::IntoIter, fn(A::Info) -> Self::Info>,
50        Map<<B::InfoIter as IntoIterator>::IntoIter, fn(B::Info) -> Self::Info>,
51    >;
52
53    fn protocol_info(&self) -> Self::InfoIter {
54        let a = self
55            .0
56            .protocol_info()
57            .into_iter()
58            .map(Either::Left as fn(A::Info) -> _);
59        let b = self
60            .1
61            .protocol_info()
62            .into_iter()
63            .map(Either::Right as fn(B::Info) -> _);
64
65        a.chain(b)
66    }
67}
68
69impl<C, A, B, TA, TB, EA, EB> InboundConnectionUpgrade<C> for SelectMuxerUpgrade<A, B>
70where
71    A: InboundConnectionUpgrade<C, Output = TA, Error = EA>,
72    B: InboundConnectionUpgrade<C, Output = TB, Error = EB>,
73{
74    type Output = future::Either<TA, TB>;
75    type Error = Either<EA, EB>;
76    type Future = EitherFuture<A::Future, B::Future>;
77
78    fn upgrade_inbound(self, sock: C, info: Self::Info) -> Self::Future {
79        match info {
80            Either::Left(info) => EitherFuture::First(self.0.upgrade_inbound(sock, info)),
81            Either::Right(info) => EitherFuture::Second(self.1.upgrade_inbound(sock, info)),
82        }
83    }
84}
85
86impl<C, A, B, TA, TB, EA, EB> OutboundConnectionUpgrade<C> for SelectMuxerUpgrade<A, B>
87where
88    A: OutboundConnectionUpgrade<C, Output = TA, Error = EA>,
89    B: OutboundConnectionUpgrade<C, Output = TB, Error = EB>,
90{
91    type Output = future::Either<TA, TB>;
92    type Error = Either<EA, EB>;
93    type Future = EitherFuture<A::Future, B::Future>;
94
95    fn upgrade_outbound(self, sock: C, info: Self::Info) -> Self::Future {
96        match info {
97            Either::Left(info) => EitherFuture::First(self.0.upgrade_outbound(sock, info)),
98            Either::Right(info) => EitherFuture::Second(self.1.upgrade_outbound(sock, info)),
99        }
100    }
101}
libp2p/builder/select_muxer.rs

libp2p/builder/
select_muxer.rs
