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RustRepoTrans / Evaluate /projects /libp2p /rust /swarm /src /handler /either.rs
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// Copyright 2021 Protocol Labs.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
use crate::handler::{
ConnectionEvent, ConnectionHandler, ConnectionHandlerEvent, FullyNegotiatedInbound,
InboundUpgradeSend, ListenUpgradeError, SubstreamProtocol,
};
use crate::upgrade::SendWrapper;
use either::Either;
use futures::future;
use std::task::{Context, Poll};
impl<LIP, RIP, LIOI, RIOI>
FullyNegotiatedInbound<Either<SendWrapper<LIP>, SendWrapper<RIP>>, Either<LIOI, RIOI>>
where
RIP: InboundUpgradeSend,
LIP: InboundUpgradeSend,
{
pub(crate) fn transpose(
self,
) -> Either<FullyNegotiatedInbound<LIP, LIOI>, FullyNegotiatedInbound<RIP, RIOI>> {
match self {
FullyNegotiatedInbound {
protocol: future::Either::Left(protocol),
info: Either::Left(info),
} => Either::Left(FullyNegotiatedInbound { protocol, info }),
FullyNegotiatedInbound {
protocol: future::Either::Right(protocol),
info: Either::Right(info),
} => Either::Right(FullyNegotiatedInbound { protocol, info }),
_ => unreachable!(),
}
}
}
impl<LIP, RIP, LIOI, RIOI>
ListenUpgradeError<Either<LIOI, RIOI>, Either<SendWrapper<LIP>, SendWrapper<RIP>>>
where
RIP: InboundUpgradeSend,
LIP: InboundUpgradeSend,
{
fn transpose(self) -> Either<ListenUpgradeError<LIOI, LIP>, ListenUpgradeError<RIOI, RIP>> {
match self {
ListenUpgradeError {
error: Either::Left(error),
info: Either::Left(info),
} => Either::Left(ListenUpgradeError { error, info }),
ListenUpgradeError {
error: Either::Right(error),
info: Either::Right(info),
} => Either::Right(ListenUpgradeError { error, info }),
_ => unreachable!(),
}
}
}
/// Implementation of a [`ConnectionHandler`] that represents either of two [`ConnectionHandler`]
/// implementations.
impl<L, R> ConnectionHandler for Either<L, R>
where
L: ConnectionHandler,
R: ConnectionHandler,
{
type FromBehaviour = Either<L::FromBehaviour, R::FromBehaviour>;
type ToBehaviour = Either<L::ToBehaviour, R::ToBehaviour>;
type InboundProtocol = Either<SendWrapper<L::InboundProtocol>, SendWrapper<R::InboundProtocol>>;
type OutboundProtocol =
Either<SendWrapper<L::OutboundProtocol>, SendWrapper<R::OutboundProtocol>>;
type InboundOpenInfo = Either<L::InboundOpenInfo, R::InboundOpenInfo>;
type OutboundOpenInfo = Either<L::OutboundOpenInfo, R::OutboundOpenInfo>;
fn listen_protocol(&self) -> SubstreamProtocol<Self::InboundProtocol, Self::InboundOpenInfo> {
match self {
Either::Left(a) => a
.listen_protocol()
.map_upgrade(|u| Either::Left(SendWrapper(u)))
.map_info(Either::Left),
Either::Right(b) => b
.listen_protocol()
.map_upgrade(|u| Either::Right(SendWrapper(u)))
.map_info(Either::Right),
}
}
fn on_behaviour_event(&mut self, event: Self::FromBehaviour) {
match (self, event) {
(Either::Left(handler), Either::Left(event)) => handler.on_behaviour_event(event),
(Either::Right(handler), Either::Right(event)) => handler.on_behaviour_event(event),
_ => unreachable!(),
}
}
fn connection_keep_alive(&self) -> bool {
match self {
Either::Left(handler) => handler.connection_keep_alive(),
Either::Right(handler) => handler.connection_keep_alive(),
}
}
fn poll(
&mut self,
cx: &mut Context<'_>,
) -> Poll<
ConnectionHandlerEvent<Self::OutboundProtocol, Self::OutboundOpenInfo, Self::ToBehaviour>,
> {
let event = match self {
Either::Left(handler) => futures::ready!(handler.poll(cx))
.map_custom(Either::Left)
.map_protocol(|p| Either::Left(SendWrapper(p)))
.map_outbound_open_info(Either::Left),
Either::Right(handler) => futures::ready!(handler.poll(cx))
.map_custom(Either::Right)
.map_protocol(|p| Either::Right(SendWrapper(p)))
.map_outbound_open_info(Either::Right),
};
Poll::Ready(event)
}
fn poll_close(&mut self, cx: &mut Context<'_>) -> Poll<Option<Self::ToBehaviour>> {
let event = match self {
Either::Left(handler) => futures::ready!(handler.poll_close(cx)).map(Either::Left),
Either::Right(handler) => futures::ready!(handler.poll_close(cx)).map(Either::Right),
};
Poll::Ready(event)
}
fn on_connection_event(
&mut self,
event: ConnectionEvent<
Self::InboundProtocol,
Self::OutboundProtocol,
Self::InboundOpenInfo,
Self::OutboundOpenInfo,
>,
) {
match event {
ConnectionEvent::FullyNegotiatedInbound(fully_negotiated_inbound) => {
match (fully_negotiated_inbound.transpose(), self) {
(Either::Left(fully_negotiated_inbound), Either::Left(handler)) => handler
.on_connection_event(ConnectionEvent::FullyNegotiatedInbound(
fully_negotiated_inbound,
)),
(Either::Right(fully_negotiated_inbound), Either::Right(handler)) => handler
.on_connection_event(ConnectionEvent::FullyNegotiatedInbound(
fully_negotiated_inbound,
)),
_ => unreachable!(),
}
}
ConnectionEvent::FullyNegotiatedOutbound(fully_negotiated_outbound) => {
match (fully_negotiated_outbound.transpose(), self) {
(Either::Left(fully_negotiated_outbound), Either::Left(handler)) => handler
.on_connection_event(ConnectionEvent::FullyNegotiatedOutbound(
fully_negotiated_outbound,
)),
(Either::Right(fully_negotiated_outbound), Either::Right(handler)) => handler
.on_connection_event(ConnectionEvent::FullyNegotiatedOutbound(
fully_negotiated_outbound,
)),
_ => unreachable!(),
}
}
ConnectionEvent::DialUpgradeError(dial_upgrade_error) => {
match (dial_upgrade_error.transpose(), self) {
(Either::Left(dial_upgrade_error), Either::Left(handler)) => handler
.on_connection_event(ConnectionEvent::DialUpgradeError(dial_upgrade_error)),
(Either::Right(dial_upgrade_error), Either::Right(handler)) => handler
.on_connection_event(ConnectionEvent::DialUpgradeError(dial_upgrade_error)),
_ => unreachable!(),
}
}
ConnectionEvent::ListenUpgradeError(listen_upgrade_error) => {
match (listen_upgrade_error.transpose(), self) {
(Either::Left(listen_upgrade_error), Either::Left(handler)) => handler
.on_connection_event(ConnectionEvent::ListenUpgradeError(
listen_upgrade_error,
)),
(Either::Right(listen_upgrade_error), Either::Right(handler)) => handler
.on_connection_event(ConnectionEvent::ListenUpgradeError(
listen_upgrade_error,
)),
_ => unreachable!(),
}
}
ConnectionEvent::AddressChange(address_change) => match self {
Either::Left(handler) => {
handler.on_connection_event(ConnectionEvent::AddressChange(address_change))
}
Either::Right(handler) => {
handler.on_connection_event(ConnectionEvent::AddressChange(address_change))
}
},
ConnectionEvent::LocalProtocolsChange(supported_protocols) => match self {
Either::Left(handler) => handler.on_connection_event(
ConnectionEvent::LocalProtocolsChange(supported_protocols),
),
Either::Right(handler) => handler.on_connection_event(
ConnectionEvent::LocalProtocolsChange(supported_protocols),
),
},
ConnectionEvent::RemoteProtocolsChange(supported_protocols) => match self {
Either::Left(handler) => handler.on_connection_event(
ConnectionEvent::RemoteProtocolsChange(supported_protocols),
),
Either::Right(handler) => handler.on_connection_event(
ConnectionEvent::RemoteProtocolsChange(supported_protocols),
),
},
}
}
}