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 std::{
22    fmt::Debug,
23    marker::PhantomData,
24    task::{Context, Poll},
25};
26
27use crate::handler::{
28    ConnectionEvent, ConnectionHandler, ConnectionHandlerEvent, SubstreamProtocol,
29};
30
31/// Wrapper around a protocol handler that turns the input event into something else.
32#[derive(Debug)]
33pub struct MapInEvent<TConnectionHandler, TNewIn, TMap> {
34    inner: TConnectionHandler,
35    map: TMap,
36    marker: PhantomData<TNewIn>,
37}
38
39impl<TConnectionHandler, TMap, TNewIn> MapInEvent<TConnectionHandler, TNewIn, TMap> {
40    /// Creates a `MapInEvent`.
41    pub(crate) fn new(inner: TConnectionHandler, map: TMap) -> Self {
42        MapInEvent {
43            inner,
44            map,
45            marker: PhantomData,
46        }
47    }
48}
49
50impl<TConnectionHandler, TMap, TNewIn> ConnectionHandler
51    for MapInEvent<TConnectionHandler, TNewIn, TMap>
52where
53    TConnectionHandler: ConnectionHandler,
54    TMap: Fn(TNewIn) -> Option<TConnectionHandler::FromBehaviour>,
55    TNewIn: Debug + Send + 'static,
56    TMap: Send + 'static,
57{
58    type FromBehaviour = TNewIn;
59    type ToBehaviour = TConnectionHandler::ToBehaviour;
60    type InboundProtocol = TConnectionHandler::InboundProtocol;
61    type OutboundProtocol = TConnectionHandler::OutboundProtocol;
62    type InboundOpenInfo = TConnectionHandler::InboundOpenInfo;
63    type OutboundOpenInfo = TConnectionHandler::OutboundOpenInfo;
64
65    fn listen_protocol(&self) -> SubstreamProtocol<Self::InboundProtocol, Self::InboundOpenInfo> {
66        self.inner.listen_protocol()
67    }
68
69    fn on_behaviour_event(&mut self, event: TNewIn) {
70        if let Some(event) = (self.map)(event) {
71            self.inner.on_behaviour_event(event);
72        }
73    }
74
75    fn connection_keep_alive(&self) -> bool {
76        self.inner.connection_keep_alive()
77    }
78
79    fn poll(
80        &mut self,
81        cx: &mut Context<'_>,
82    ) -> Poll<
83        ConnectionHandlerEvent<Self::OutboundProtocol, Self::OutboundOpenInfo, Self::ToBehaviour>,
84    > {
85        self.inner.poll(cx)
86    }
87
88    fn poll_close(&mut self, cx: &mut Context<'_>) -> Poll<Option<Self::ToBehaviour>> {
89        self.inner.poll_close(cx)
90    }
91
92    fn on_connection_event(
93        &mut self,
94        event: ConnectionEvent<
95            Self::InboundProtocol,
96            Self::OutboundProtocol,
97            Self::InboundOpenInfo,
98            Self::OutboundOpenInfo,
99        >,
100    ) {
101        self.inner.on_connection_event(event);
102    }
103}
libp2p_swarm/handler/map_in.rs

libp2p_swarm/handler/
map_in.rs
