libp2p_core/upgrade/
select.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
21use crate::either::EitherFuture;
22use crate::upgrade::{
23    InboundConnectionUpgrade, InboundUpgrade, OutboundConnectionUpgrade, OutboundUpgrade,
24    UpgradeInfo,
25};
26use either::Either;
27use futures::future;
28use std::iter::{Chain, Map};
29
30/// Upgrade that combines two upgrades into one. Supports all the protocols supported by either
31/// sub-upgrade.
32///
33/// The protocols supported by the first element have a higher priority.
34#[derive(Debug, Clone)]
35pub struct SelectUpgrade<A, B>(A, B);
36
37impl<A, B> SelectUpgrade<A, B> {
38    /// Combines two upgrades into an `SelectUpgrade`.
39    ///
40    /// The protocols supported by the first element have a higher priority.
41    pub fn new(a: A, b: B) -> Self {
42        SelectUpgrade(a, b)
43    }
44}
45
46impl<A, B> UpgradeInfo for SelectUpgrade<A, B>
47where
48    A: UpgradeInfo,
49    B: UpgradeInfo,
50{
51    type Info = Either<A::Info, B::Info>;
52    type InfoIter = Chain<
53        Map<<A::InfoIter as IntoIterator>::IntoIter, fn(A::Info) -> Self::Info>,
54        Map<<B::InfoIter as IntoIterator>::IntoIter, fn(B::Info) -> Self::Info>,
55    >;
56
57    fn protocol_info(&self) -> Self::InfoIter {
58        let a = self
59            .0
60            .protocol_info()
61            .into_iter()
62            .map(Either::Left as fn(A::Info) -> _);
63        let b = self
64            .1
65            .protocol_info()
66            .into_iter()
67            .map(Either::Right as fn(B::Info) -> _);
68
69        a.chain(b)
70    }
71}
72
73impl<C, A, B, TA, TB, EA, EB> InboundUpgrade<C> for SelectUpgrade<A, B>
74where
75    A: InboundUpgrade<C, Output = TA, Error = EA>,
76    B: InboundUpgrade<C, Output = TB, Error = EB>,
77{
78    type Output = future::Either<TA, TB>;
79    type Error = Either<EA, EB>;
80    type Future = EitherFuture<A::Future, B::Future>;
81
82    fn upgrade_inbound(self, sock: C, info: Self::Info) -> Self::Future {
83        match info {
84            Either::Left(info) => EitherFuture::First(self.0.upgrade_inbound(sock, info)),
85            Either::Right(info) => EitherFuture::Second(self.1.upgrade_inbound(sock, info)),
86        }
87    }
88}
89
90impl<C, A, B, TA, TB, EA, EB> InboundConnectionUpgrade<C> for SelectUpgrade<A, B>
91where
92    A: InboundConnectionUpgrade<C, Output = TA, Error = EA>,
93    B: InboundConnectionUpgrade<C, Output = TB, Error = EB>,
94{
95    type Output = future::Either<TA, TB>;
96    type Error = Either<EA, EB>;
97    type Future = EitherFuture<A::Future, B::Future>;
98
99    fn upgrade_inbound(self, sock: C, info: Self::Info) -> Self::Future {
100        match info {
101            Either::Left(info) => EitherFuture::First(self.0.upgrade_inbound(sock, info)),
102            Either::Right(info) => EitherFuture::Second(self.1.upgrade_inbound(sock, info)),
103        }
104    }
105}
106
107impl<C, A, B, TA, TB, EA, EB> OutboundUpgrade<C> for SelectUpgrade<A, B>
108where
109    A: OutboundUpgrade<C, Output = TA, Error = EA>,
110    B: OutboundUpgrade<C, Output = TB, Error = EB>,
111{
112    type Output = future::Either<TA, TB>;
113    type Error = Either<EA, EB>;
114    type Future = EitherFuture<A::Future, B::Future>;
115
116    fn upgrade_outbound(self, sock: C, info: Self::Info) -> Self::Future {
117        match info {
118            Either::Left(info) => EitherFuture::First(self.0.upgrade_outbound(sock, info)),
119            Either::Right(info) => EitherFuture::Second(self.1.upgrade_outbound(sock, info)),
120        }
121    }
122}
123
124impl<C, A, B, TA, TB, EA, EB> OutboundConnectionUpgrade<C> for SelectUpgrade<A, B>
125where
126    A: OutboundConnectionUpgrade<C, Output = TA, Error = EA>,
127    B: OutboundConnectionUpgrade<C, Output = TB, Error = EB>,
128{
129    type Output = future::Either<TA, TB>;
130    type Error = Either<EA, EB>;
131    type Future = EitherFuture<A::Future, B::Future>;
132
133    fn upgrade_outbound(self, sock: C, info: Self::Info) -> Self::Future {
134        match info {
135            Either::Left(info) => EitherFuture::First(self.0.upgrade_outbound(sock, info)),
136            Either::Right(info) => EitherFuture::Second(self.1.upgrade_outbound(sock, info)),
137        }
138    }
139}
libp2p_core/upgrade/select.rs

libp2p_core/upgrade/
select.rs
