libp2p_core/upgrade/
either.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::{
22    either::{EitherOutput, EitherError, EitherFuture2, EitherName},
23    upgrade::{InboundUpgrade, OutboundUpgrade, UpgradeInfo}
24};
25
26/// A type to represent two possible upgrade types (inbound or outbound).
27#[derive(Debug, Clone)]
28pub enum EitherUpgrade<A, B> { A(A), B(B) }
29
30impl<A, B> UpgradeInfo for EitherUpgrade<A, B>
31where
32    A: UpgradeInfo,
33    B: UpgradeInfo
34{
35    type Info = EitherName<A::Info, B::Info>;
36    type InfoIter = EitherIter<
37        <A::InfoIter as IntoIterator>::IntoIter,
38        <B::InfoIter as IntoIterator>::IntoIter
39    >;
40
41    fn protocol_info(&self) -> Self::InfoIter {
42        match self {
43            EitherUpgrade::A(a) => EitherIter::A(a.protocol_info().into_iter()),
44            EitherUpgrade::B(b) => EitherIter::B(b.protocol_info().into_iter())
45        }
46    }
47}
48
49impl<C, A, B, TA, TB, EA, EB> InboundUpgrade<C> for EitherUpgrade<A, B>
50where
51    A: InboundUpgrade<C, Output = TA, Error = EA>,
52    B: InboundUpgrade<C, Output = TB, Error = EB>,
53{
54    type Output = EitherOutput<TA, TB>;
55    type Error = EitherError<EA, EB>;
56    type Future = EitherFuture2<A::Future, B::Future>;
57
58    fn upgrade_inbound(self, sock: C, info: Self::Info) -> Self::Future {
59        match (self, info) {
60            (EitherUpgrade::A(a), EitherName::A(info)) => EitherFuture2::A(a.upgrade_inbound(sock, info)),
61            (EitherUpgrade::B(b), EitherName::B(info)) => EitherFuture2::B(b.upgrade_inbound(sock, info)),
62            _ => panic!("Invalid invocation of EitherUpgrade::upgrade_inbound")
63        }
64    }
65}
66
67impl<C, A, B, TA, TB, EA, EB> OutboundUpgrade<C> for EitherUpgrade<A, B>
68where
69    A: OutboundUpgrade<C, Output = TA, Error = EA>,
70    B: OutboundUpgrade<C, Output = TB, Error = EB>,
71{
72    type Output = EitherOutput<TA, TB>;
73    type Error = EitherError<EA, EB>;
74    type Future = EitherFuture2<A::Future, B::Future>;
75
76    fn upgrade_outbound(self, sock: C, info: Self::Info) -> Self::Future {
77        match (self, info) {
78            (EitherUpgrade::A(a), EitherName::A(info)) => EitherFuture2::A(a.upgrade_outbound(sock, info)),
79            (EitherUpgrade::B(b), EitherName::B(info)) => EitherFuture2::B(b.upgrade_outbound(sock, info)),
80            _ => panic!("Invalid invocation of EitherUpgrade::upgrade_outbound")
81        }
82    }
83}
84
85/// A type to represent two possible `Iterator` types.
86#[derive(Debug, Clone)]
87pub enum EitherIter<A, B> { A(A), B(B) }
88
89impl<A, B> Iterator for EitherIter<A, B>
90where
91    A: Iterator,
92    B: Iterator
93{
94    type Item = EitherName<A::Item, B::Item>;
95
96    fn next(&mut self) -> Option<Self::Item> {
97        match self {
98            EitherIter::A(a) => a.next().map(EitherName::A),
99            EitherIter::B(b) => b.next().map(EitherName::B)
100        }
101    }
102
103    fn size_hint(&self) -> (usize, Option<usize>) {
104        match self {
105            EitherIter::A(a) => a.size_hint(),
106            EitherIter::B(b) => b.size_hint()
107        }
108    }
109}
110
libp2p_core/upgrade/either.rs

libp2p_core/upgrade/
either.rs
