libp2p_swarm/handler/
map_in.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::handler::{
22    ConnectionEvent, ConnectionHandler, ConnectionHandlerEvent, SubstreamProtocol,
23};
24use std::{fmt::Debug, marker::PhantomData, task::Context, task::Poll};
25
26/// Wrapper around a protocol handler that turns the input event into something else.
27#[derive(Debug)]
28pub struct MapInEvent<TConnectionHandler, TNewIn, TMap> {
29    inner: TConnectionHandler,
30    map: TMap,
31    marker: PhantomData<TNewIn>,
32}
33
34impl<TConnectionHandler, TMap, TNewIn> MapInEvent<TConnectionHandler, TNewIn, TMap> {
35    /// Creates a `MapInEvent`.
36    pub(crate) fn new(inner: TConnectionHandler, map: TMap) -> Self {
37        MapInEvent {
38            inner,
39            map,
40            marker: PhantomData,
41        }
42    }
43}
44
45impl<TConnectionHandler, TMap, TNewIn> ConnectionHandler
46    for MapInEvent<TConnectionHandler, TNewIn, TMap>
47where
48    TConnectionHandler: ConnectionHandler,
49    TMap: Fn(TNewIn) -> Option<TConnectionHandler::FromBehaviour>,
50    TNewIn: Debug + Send + 'static,
51    TMap: Send + 'static,
52{
53    type FromBehaviour = TNewIn;
54    type ToBehaviour = TConnectionHandler::ToBehaviour;
55    type InboundProtocol = TConnectionHandler::InboundProtocol;
56    type OutboundProtocol = TConnectionHandler::OutboundProtocol;
57    type InboundOpenInfo = TConnectionHandler::InboundOpenInfo;
58    type OutboundOpenInfo = TConnectionHandler::OutboundOpenInfo;
59
60    fn listen_protocol(&self) -> SubstreamProtocol<Self::InboundProtocol, Self::InboundOpenInfo> {
61        self.inner.listen_protocol()
62    }
63
64    fn on_behaviour_event(&mut self, event: TNewIn) {
65        if let Some(event) = (self.map)(event) {
66            self.inner.on_behaviour_event(event);
67        }
68    }
69
70    fn connection_keep_alive(&self) -> bool {
71        self.inner.connection_keep_alive()
72    }
73
74    fn poll(
75        &mut self,
76        cx: &mut Context<'_>,
77    ) -> Poll<
78        ConnectionHandlerEvent<Self::OutboundProtocol, Self::OutboundOpenInfo, Self::ToBehaviour>,
79    > {
80        self.inner.poll(cx)
81    }
82
83    fn poll_close(&mut self, cx: &mut Context<'_>) -> Poll<Option<Self::ToBehaviour>> {
84        self.inner.poll_close(cx)
85    }
86
87    fn on_connection_event(
88        &mut self,
89        event: ConnectionEvent<
90            Self::InboundProtocol,
91            Self::OutboundProtocol,
92            Self::InboundOpenInfo,
93            Self::OutboundOpenInfo,
94        >,
95    ) {
96        self.inner.on_connection_event(event);
97    }
98}
libp2p_swarm/handler/map_in.rs

libp2p_swarm/handler/
map_in.rs
