Simplify trait bounds on NetworkBehaviour (#1405)

* Simplify trait bounds requirements

* More work

* Moar

* Finish

* Fix final tests

* More simplification

* Use separate traits for Inbound/Outbound

* Update gossipsub and remove warnings

* Add documentation to swarm

* Remove BoxSubstream

* Fix tests not compiling

* Fix stack overflow

* Address concerns

* For some reason my IDE ignored libp2p-kad
This commit is contained in:
Pierre Krieger
2020-02-07 16:29:30 +01:00
committed by GitHub
parent 69852a580b
commit 1eff4b9823
32 changed files with 580 additions and 652 deletions

View File

@ -55,6 +55,7 @@
mod behaviour;
mod registry;
mod upgrade;
pub mod protocols_handler;
pub mod toggle;
@ -77,28 +78,35 @@ pub use protocols_handler::{
SubstreamProtocol
};
/// Substream for which a protocol has been chosen.
///
/// Implements the [`AsyncRead`](futures::io::AsyncRead) and
/// [`AsyncWrite`](futures::io::AsyncWrite) traits.
pub type NegotiatedSubstream = Negotiated<Substream<StreamMuxerBox>>;
use protocols_handler::{NodeHandlerWrapperBuilder, NodeHandlerWrapperError};
use futures::{prelude::*, executor::{ThreadPool, ThreadPoolBuilder}};
use libp2p_core::{
Executor,
Transport, Multiaddr, Negotiated, PeerId, InboundUpgrade, OutboundUpgrade, UpgradeInfo, ProtocolName,
muxing::StreamMuxer,
Executor, Negotiated, Transport, Multiaddr, PeerId, ProtocolName,
muxing::{StreamMuxer, StreamMuxerBox},
nodes::{
ListenerId,
ListenerId, Substream,
collection::ConnectionInfo,
node::Substream,
network::{self, Network, NetworkEvent}
},
transport::TransportError
transport::{
boxed::Boxed as BoxTransport,
TransportError,
}
};
use registry::{Addresses, AddressIntoIter};
use smallvec::SmallVec;
use std::{error, fmt, ops::{Deref, DerefMut}, pin::Pin, task::{Context, Poll}};
use std::{error, fmt, io, ops::{Deref, DerefMut}, pin::Pin, task::{Context, Poll}};
use std::collections::HashSet;
use upgrade::UpgradeInfoSend as _;
/// Contains the state of the network, plus the way it should behave.
pub type Swarm<TTransport, TBehaviour, TConnInfo = PeerId> = ExpandedSwarm<
TTransport,
pub type Swarm<TBehaviour, TConnInfo = PeerId> = ExpandedSwarm<
TBehaviour,
<<<TBehaviour as NetworkBehaviour>::ProtocolsHandler as IntoProtocolsHandler>::Handler as ProtocolsHandler>::InEvent,
<<<TBehaviour as NetworkBehaviour>::ProtocolsHandler as IntoProtocolsHandler>::Handler as ProtocolsHandler>::OutEvent,
@ -135,12 +143,9 @@ pub enum SwarmEvent<TBvEv> {
}
/// Contains the state of the network, plus the way it should behave.
pub struct ExpandedSwarm<TTransport, TBehaviour, TInEvent, TOutEvent, THandler, THandlerErr, TConnInfo = PeerId>
where
TTransport: Transport,
{
pub struct ExpandedSwarm<TBehaviour, TInEvent, TOutEvent, THandler, THandlerErr, TConnInfo = PeerId> {
network: Network<
TTransport,
BoxTransport<(TConnInfo, StreamMuxerBox), io::Error>,
TInEvent,
TOutEvent,
NodeHandlerWrapperBuilder<THandler>,
@ -170,10 +175,8 @@ where
send_event_to_complete: Option<(PeerId, TInEvent)>
}
impl<TTransport, TBehaviour, TInEvent, TOutEvent, THandler, THandlerErr, TConnInfo> Deref for
ExpandedSwarm<TTransport, TBehaviour, TInEvent, TOutEvent, THandler, THandlerErr, TConnInfo>
where
TTransport: Transport,
impl<TBehaviour, TInEvent, TOutEvent, THandler, THandlerErr, TConnInfo> Deref for
ExpandedSwarm<TBehaviour, TInEvent, TOutEvent, THandler, THandlerErr, TConnInfo>
{
type Target = TBehaviour;
@ -182,69 +185,50 @@ where
}
}
impl<TTransport, TBehaviour, TInEvent, TOutEvent, THandler, THandlerErr, TConnInfo> DerefMut for
ExpandedSwarm<TTransport, TBehaviour, TInEvent, TOutEvent, THandler, THandlerErr, TConnInfo>
where
TTransport: Transport,
impl<TBehaviour, TInEvent, TOutEvent, THandler, THandlerErr, TConnInfo> DerefMut for
ExpandedSwarm<TBehaviour, TInEvent, TOutEvent, THandler, THandlerErr, TConnInfo>
{
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.behaviour
}
}
impl<TTransport, TBehaviour, TInEvent, TOutEvent, THandler, THandlerErr, TConnInfo> Unpin for
ExpandedSwarm<TTransport, TBehaviour, TInEvent, TOutEvent, THandler, THandlerErr, TConnInfo>
where
TTransport: Transport,
impl<TBehaviour, TInEvent, TOutEvent, THandler, THandlerErr, TConnInfo> Unpin for
ExpandedSwarm<TBehaviour, TInEvent, TOutEvent, THandler, THandlerErr, TConnInfo>
{
}
impl<TTransport, TBehaviour, TMuxer, TInEvent, TOutEvent, THandler, THandlerErr, TConnInfo>
ExpandedSwarm<TTransport, TBehaviour, TInEvent, TOutEvent, THandler, THandlerErr, TConnInfo>
impl<TBehaviour, TInEvent, TOutEvent, THandler, THandlerErr, TConnInfo>
ExpandedSwarm<TBehaviour, TInEvent, TOutEvent, THandler, THandlerErr, TConnInfo>
where TBehaviour: NetworkBehaviour<ProtocolsHandler = THandler>,
TInEvent: Send + 'static,
TOutEvent: Send + 'static,
TConnInfo: ConnectionInfo<PeerId = PeerId> + fmt::Debug + Clone + Send + 'static,
TMuxer: StreamMuxer + Send + Sync + 'static,
TMuxer::OutboundSubstream: Send + 'static,
TMuxer::Substream: Send + 'static,
TTransport: Transport<Output = (TConnInfo, TMuxer)> + Clone,
TTransport::Error: Send + 'static,
TTransport::Listener: Send + 'static,
TTransport::ListenerUpgrade: Send + 'static,
TTransport::Dial: Send + 'static,
THandlerErr: error::Error + Send + 'static,
THandler: IntoProtocolsHandler + Send + 'static,
THandler::Handler: ProtocolsHandler<InEvent = TInEvent, OutEvent = TOutEvent, Substream = Substream<TMuxer>, Error = THandlerErr> + Send + 'static,
<THandler::Handler as ProtocolsHandler>::OutboundOpenInfo: Send + 'static, // TODO: shouldn't be necessary
<THandler::Handler as ProtocolsHandler>::InboundProtocol: InboundUpgrade<Negotiated<Substream<TMuxer>>> + Send + 'static,
<<THandler::Handler as ProtocolsHandler>::InboundProtocol as UpgradeInfo>::Info: Send + 'static,
<<THandler::Handler as ProtocolsHandler>::InboundProtocol as UpgradeInfo>::InfoIter: Send + 'static,
<<<THandler::Handler as ProtocolsHandler>::InboundProtocol as UpgradeInfo>::InfoIter as IntoIterator>::IntoIter: Send + 'static,
<<THandler::Handler as ProtocolsHandler>::InboundProtocol as InboundUpgrade<Negotiated<Substream<TMuxer>>>>::Error: Send + 'static,
<<THandler::Handler as ProtocolsHandler>::InboundProtocol as InboundUpgrade<Negotiated<Substream<TMuxer>>>>::Future: Send + 'static,
<THandler::Handler as ProtocolsHandler>::OutboundProtocol: OutboundUpgrade<Negotiated<Substream<TMuxer>>> + Send + 'static,
<<THandler::Handler as ProtocolsHandler>::OutboundProtocol as UpgradeInfo>::Info: Send + 'static,
<<THandler::Handler as ProtocolsHandler>::OutboundProtocol as UpgradeInfo>::InfoIter: Send + 'static,
<<<THandler::Handler as ProtocolsHandler>::OutboundProtocol as UpgradeInfo>::InfoIter as IntoIterator>::IntoIter: Send + 'static,
<<THandler::Handler as ProtocolsHandler>::OutboundProtocol as OutboundUpgrade<Negotiated<Substream<TMuxer>>>>::Future: Send + 'static,
<<THandler::Handler as ProtocolsHandler>::OutboundProtocol as OutboundUpgrade<Negotiated<Substream<TMuxer>>>>::Error: Send + 'static,
THandler::Handler: ProtocolsHandler<InEvent = TInEvent, OutEvent = TOutEvent, Error = THandlerErr>,
{
/// Builds a new `Swarm`.
pub fn new(transport: TTransport, behaviour: TBehaviour, local_peer_id: PeerId) -> Self {
pub fn new<TTransport, TMuxer>(transport: TTransport, behaviour: TBehaviour, local_peer_id: PeerId) -> Self
where
TMuxer: StreamMuxer + Send + Sync + 'static,
TMuxer::OutboundSubstream: Send + 'static,
<TMuxer as StreamMuxer>::OutboundSubstream: Send + 'static,
<TMuxer as StreamMuxer>::Substream: Send + 'static,
TTransport: Transport<Output = (TConnInfo, TMuxer)> + Clone + Send + Sync + 'static,
TTransport::Error: Send + Sync + 'static,
TTransport::Listener: Send + 'static,
TTransport::ListenerUpgrade: Send + 'static,
TTransport::Dial: Send + 'static,
{
SwarmBuilder::new(transport, behaviour, local_peer_id)
.build()
}
/// Returns the transport passed when building this object.
pub fn transport(me: &Self) -> &TTransport {
me.network.transport()
}
/// Starts listening on the given address.
///
/// Returns an error if the address is not supported.
pub fn listen_on(me: &mut Self, addr: Multiaddr) -> Result<ListenerId, TransportError<TTransport::Error>> {
pub fn listen_on(me: &mut Self, addr: Multiaddr) -> Result<ListenerId, TransportError<io::Error>> {
me.network.listen_on(addr)
}
@ -258,7 +242,7 @@ where TBehaviour: NetworkBehaviour<ProtocolsHandler = THandler>,
/// Tries to dial the given address.
///
/// Returns an error if the address is not supported.
pub fn dial_addr(me: &mut Self, addr: Multiaddr) -> Result<(), TransportError<TTransport::Error>> {
pub fn dial_addr(me: &mut Self, addr: Multiaddr) -> Result<(), TransportError<io::Error>> {
let handler = me.behaviour.new_handler();
me.network.dial(addr, handler.into_node_handler_builder())
}
@ -496,35 +480,14 @@ where TBehaviour: NetworkBehaviour<ProtocolsHandler = THandler>,
}
}
impl<TTransport, TBehaviour, TMuxer, TInEvent, TOutEvent, THandler, THandlerErr, TConnInfo> Stream for
ExpandedSwarm<TTransport, TBehaviour, TInEvent, TOutEvent, THandler, THandlerErr, TConnInfo>
impl<TBehaviour, TInEvent, TOutEvent, THandler, THandlerErr, TConnInfo> Stream for
ExpandedSwarm<TBehaviour, TInEvent, TOutEvent, THandler, THandlerErr, TConnInfo>
where TBehaviour: NetworkBehaviour<ProtocolsHandler = THandler>,
TMuxer: StreamMuxer + Send + Sync + 'static,
<TMuxer as StreamMuxer>::OutboundSubstream: Send + 'static,
<TMuxer as StreamMuxer>::Substream: Send + 'static,
TTransport: Transport<Output = (TConnInfo, TMuxer)> + Clone,
TTransport::Error: Send + 'static,
TTransport::Listener: Send + 'static,
TTransport::ListenerUpgrade: Send + 'static,
TTransport::Dial: Send + 'static,
THandlerErr: error::Error + Send + 'static,
THandler: IntoProtocolsHandler + Send + 'static,
TInEvent: Send + 'static,
TOutEvent: Send + 'static,
THandler::Handler: ProtocolsHandler<InEvent = TInEvent, OutEvent = TOutEvent, Substream = Substream<TMuxer>, Error = THandlerErr> + Send + 'static,
<THandler::Handler as ProtocolsHandler>::OutboundOpenInfo: Send + 'static, // TODO: shouldn't be necessary
<THandler::Handler as ProtocolsHandler>::InboundProtocol: InboundUpgrade<Negotiated<Substream<TMuxer>>> + Send + 'static,
<<THandler::Handler as ProtocolsHandler>::InboundProtocol as InboundUpgrade<Negotiated<Substream<TMuxer>>>>::Future: Send + 'static,
<<THandler::Handler as ProtocolsHandler>::InboundProtocol as InboundUpgrade<Negotiated<Substream<TMuxer>>>>::Error: Send + 'static,
<<THandler::Handler as ProtocolsHandler>::InboundProtocol as UpgradeInfo>::Info: Send + 'static,
<<THandler::Handler as ProtocolsHandler>::InboundProtocol as UpgradeInfo>::InfoIter: Send + 'static,
<<<THandler::Handler as ProtocolsHandler>::InboundProtocol as UpgradeInfo>::InfoIter as IntoIterator>::IntoIter: Send + 'static,
<THandler::Handler as ProtocolsHandler>::OutboundProtocol: OutboundUpgrade<Negotiated<Substream<TMuxer>>> + Send + 'static,
<<THandler::Handler as ProtocolsHandler>::OutboundProtocol as OutboundUpgrade<Negotiated<Substream<TMuxer>>>>::Future: Send + 'static,
<<THandler::Handler as ProtocolsHandler>::OutboundProtocol as OutboundUpgrade<Negotiated<Substream<TMuxer>>>>::Error: Send + 'static,
<<THandler::Handler as ProtocolsHandler>::OutboundProtocol as UpgradeInfo>::Info: Send + 'static,
<<THandler::Handler as ProtocolsHandler>::OutboundProtocol as UpgradeInfo>::InfoIter: Send + 'static,
<<<THandler::Handler as ProtocolsHandler>::OutboundProtocol as UpgradeInfo>::InfoIter as IntoIterator>::IntoIter: Send + 'static,
THandler::Handler: ProtocolsHandler<InEvent = TInEvent, OutEvent = TOutEvent, Error = THandlerErr>,
TConnInfo: ConnectionInfo<PeerId = PeerId> + fmt::Debug + Clone + Send + 'static,
{
type Item = TBehaviour::OutEvent;
@ -570,45 +533,35 @@ impl<'a> PollParameters for SwarmPollParameters<'a> {
}
}
pub struct SwarmBuilder<TTransport, TBehaviour> {
pub struct SwarmBuilder<TBehaviour, TConnInfo> {
incoming_limit: Option<u32>,
executor: Option<Box<dyn Executor + Send>>,
local_peer_id: PeerId,
transport: TTransport,
transport: BoxTransport<(TConnInfo, StreamMuxerBox), io::Error>,
behaviour: TBehaviour,
}
impl<TTransport, TBehaviour, TMuxer, TConnInfo> SwarmBuilder<TTransport, TBehaviour>
impl<TBehaviour, TConnInfo> SwarmBuilder<TBehaviour, TConnInfo>
where TBehaviour: NetworkBehaviour,
TMuxer: StreamMuxer + Send + Sync + 'static,
<TMuxer as StreamMuxer>::OutboundSubstream: Send + 'static,
<TMuxer as StreamMuxer>::Substream: Send + 'static,
TTransport: Transport<Output = (TConnInfo, TMuxer)> + Clone,
TTransport::Error: Send + 'static,
TTransport::Listener: Send + 'static,
TTransport::ListenerUpgrade: Send + 'static,
TTransport::Dial: Send + 'static,
TBehaviour::ProtocolsHandler: Send + 'static,
<TBehaviour::ProtocolsHandler as IntoProtocolsHandler>::Handler: ProtocolsHandler<Substream = Substream<TMuxer>> + Send + 'static,
<<TBehaviour::ProtocolsHandler as IntoProtocolsHandler>::Handler as ProtocolsHandler>::InEvent: Send + 'static,
<<TBehaviour::ProtocolsHandler as IntoProtocolsHandler>::Handler as ProtocolsHandler>::OutEvent: Send + 'static,
<<TBehaviour::ProtocolsHandler as IntoProtocolsHandler>::Handler as ProtocolsHandler>::Error: Send + 'static,
<<TBehaviour::ProtocolsHandler as IntoProtocolsHandler>::Handler as ProtocolsHandler>::OutboundOpenInfo: Send + 'static, // TODO: shouldn't be necessary
<<TBehaviour::ProtocolsHandler as IntoProtocolsHandler>::Handler as ProtocolsHandler>::InboundProtocol: InboundUpgrade<Negotiated<Substream<TMuxer>>> + Send + 'static,
<<<TBehaviour::ProtocolsHandler as IntoProtocolsHandler>::Handler as ProtocolsHandler>::InboundProtocol as UpgradeInfo>::Info: Send + 'static,
<<<TBehaviour::ProtocolsHandler as IntoProtocolsHandler>::Handler as ProtocolsHandler>::InboundProtocol as UpgradeInfo>::InfoIter: Send + 'static,
<<<<TBehaviour::ProtocolsHandler as IntoProtocolsHandler>::Handler as ProtocolsHandler>::InboundProtocol as UpgradeInfo>::InfoIter as IntoIterator>::IntoIter: Send + 'static,
<<<TBehaviour::ProtocolsHandler as IntoProtocolsHandler>::Handler as ProtocolsHandler>::InboundProtocol as InboundUpgrade<Negotiated<Substream<TMuxer>>>>::Error: Send + 'static,
<<<TBehaviour::ProtocolsHandler as IntoProtocolsHandler>::Handler as ProtocolsHandler>::InboundProtocol as InboundUpgrade<Negotiated<Substream<TMuxer>>>>::Future: Send + 'static,
<<TBehaviour::ProtocolsHandler as IntoProtocolsHandler>::Handler as ProtocolsHandler>::OutboundProtocol: OutboundUpgrade<Negotiated<Substream<TMuxer>>> + Send + 'static,
<<<TBehaviour::ProtocolsHandler as IntoProtocolsHandler>::Handler as ProtocolsHandler>::OutboundProtocol as UpgradeInfo>::Info: Send + 'static,
<<<TBehaviour::ProtocolsHandler as IntoProtocolsHandler>::Handler as ProtocolsHandler>::OutboundProtocol as UpgradeInfo>::InfoIter: Send + 'static,
<<<<TBehaviour::ProtocolsHandler as IntoProtocolsHandler>::Handler as ProtocolsHandler>::OutboundProtocol as UpgradeInfo>::InfoIter as IntoIterator>::IntoIter: Send + 'static,
<<<TBehaviour::ProtocolsHandler as IntoProtocolsHandler>::Handler as ProtocolsHandler>::OutboundProtocol as OutboundUpgrade<Negotiated<Substream<TMuxer>>>>::Future: Send + 'static,
<<<TBehaviour::ProtocolsHandler as IntoProtocolsHandler>::Handler as ProtocolsHandler>::OutboundProtocol as OutboundUpgrade<Negotiated<Substream<TMuxer>>>>::Error: Send + 'static,
TConnInfo: ConnectionInfo<PeerId = PeerId> + fmt::Debug + Clone + Send + 'static,
{
pub fn new(transport: TTransport, behaviour: TBehaviour, local_peer_id: PeerId) -> Self {
pub fn new<TTransport, TMuxer>(transport: TTransport, behaviour: TBehaviour, local_peer_id: PeerId) -> Self
where
TMuxer: StreamMuxer + Send + Sync + 'static,
TMuxer::OutboundSubstream: Send + 'static,
<TMuxer as StreamMuxer>::OutboundSubstream: Send + 'static,
<TMuxer as StreamMuxer>::Substream: Send + 'static,
TTransport: Transport<Output = (TConnInfo, TMuxer)> + Clone + Send + Sync + 'static,
TTransport::Error: Send + Sync + 'static,
TTransport::Listener: Send + 'static,
TTransport::ListenerUpgrade: Send + 'static,
TTransport::Dial: Send + 'static,
{
let transport = transport
.map(|(conn_info, muxer), _| (conn_info, StreamMuxerBox::new(muxer)))
.map_err(|err| io::Error::new(io::ErrorKind::Other, err))
.boxed();
SwarmBuilder {
incoming_limit: None,
local_peer_id,
@ -643,7 +596,7 @@ where TBehaviour: NetworkBehaviour,
self
}
pub fn build(mut self) -> Swarm<TTransport, TBehaviour, TConnInfo> {
pub fn build(mut self) -> Swarm<TBehaviour, TConnInfo> {
let supported_protocols = self.behaviour
.new_handler()
.inbound_protocol()
@ -686,58 +639,49 @@ where TBehaviour: NetworkBehaviour,
}
}
/// Dummy implementation of [`NetworkBehaviour`] that doesn't do anything.
#[derive(Clone, Default)]
pub struct DummyBehaviour {
}
impl NetworkBehaviour for DummyBehaviour {
type ProtocolsHandler = protocols_handler::DummyProtocolsHandler;
type OutEvent = void::Void;
fn new_handler(&mut self) -> Self::ProtocolsHandler {
protocols_handler::DummyProtocolsHandler::default()
}
fn addresses_of_peer(&mut self, _: &PeerId) -> Vec<Multiaddr> {
Vec::new()
}
fn inject_connected(&mut self, _: PeerId, _: libp2p_core::ConnectedPoint) {}
fn inject_disconnected(&mut self, _: &PeerId, _: libp2p_core::ConnectedPoint) {}
fn inject_node_event(&mut self, _: PeerId,
_: <Self::ProtocolsHandler as ProtocolsHandler>::OutEvent) {}
fn poll(&mut self, _: &mut Context, _: &mut impl PollParameters) ->
Poll<NetworkBehaviourAction<<Self::ProtocolsHandler as
ProtocolsHandler>::InEvent, Self::OutEvent>>
{
Poll::Pending
}
}
#[cfg(test)]
mod tests {
use crate::protocols_handler::{DummyProtocolsHandler, ProtocolsHandler};
use crate::{NetworkBehaviour, NetworkBehaviourAction, PollParameters, SwarmBuilder};
use crate::{DummyBehaviour, SwarmBuilder};
use libp2p_core::{
ConnectedPoint,
identity,
Multiaddr,
PeerId,
PublicKey,
transport::dummy::{DummyStream, DummyTransport}
};
use libp2p_mplex::Multiplex;
use futures::prelude::*;
use std::{marker::PhantomData, task::Context, task::Poll};
use void::Void;
#[derive(Clone)]
struct DummyBehaviour<TSubstream> {
marker: PhantomData<TSubstream>,
}
impl<TSubstream> NetworkBehaviour
for DummyBehaviour<TSubstream>
where TSubstream: AsyncRead + AsyncWrite + Unpin
{
type ProtocolsHandler = DummyProtocolsHandler<TSubstream>;
type OutEvent = Void;
fn new_handler(&mut self) -> Self::ProtocolsHandler {
DummyProtocolsHandler::default()
}
fn addresses_of_peer(&mut self, _: &PeerId) -> Vec<Multiaddr> {
Vec::new()
}
fn inject_connected(&mut self, _: PeerId, _: ConnectedPoint) {}
fn inject_disconnected(&mut self, _: &PeerId, _: ConnectedPoint) {}
fn inject_node_event(&mut self, _: PeerId,
_: <Self::ProtocolsHandler as ProtocolsHandler>::OutEvent) {}
fn poll(&mut self, _: &mut Context, _: &mut impl PollParameters) ->
Poll<NetworkBehaviourAction<<Self::ProtocolsHandler as
ProtocolsHandler>::InEvent, Self::OutEvent>>
{
Poll::Pending
}
}
fn get_random_id() -> PublicKey {
identity::Keypair::generate_ed25519().public()
@ -747,8 +691,7 @@ mod tests {
fn test_build_swarm() {
let id = get_random_id();
let transport = DummyTransport::<(PeerId, Multiplex<DummyStream>)>::new();
let behaviour = DummyBehaviour{marker: PhantomData};
let swarm = SwarmBuilder::new(transport, behaviour, id.into())
let swarm = SwarmBuilder::new(transport, DummyBehaviour {}, id.into())
.incoming_limit(Some(4)).build();
assert_eq!(swarm.network.incoming_limit(), Some(4));
}
@ -757,8 +700,7 @@ mod tests {
fn test_build_swarm_with_max_listeners_none() {
let id = get_random_id();
let transport = DummyTransport::<(PeerId, Multiplex<DummyStream>)>::new();
let behaviour = DummyBehaviour{marker: PhantomData};
let swarm = SwarmBuilder::new(transport, behaviour, id.into()).build();
let swarm = SwarmBuilder::new(transport, DummyBehaviour {}, id.into()).build();
assert!(swarm.network.incoming_limit().is_none())
}
}