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// Copyright 2020 Parity Technologies (UK) Ltd.
// This file is part of Polkadot.
// Polkadot is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Polkadot is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Polkadot. If not, see <http://www.gnu.org/licenses/>.
//! The Network Bridge Subsystem - protocol multiplexer for Polkadot.
use parity_scale_codec::{Encode, Decode};
use futures::prelude::*;
use futures::future::BoxFuture;
use futures::stream::BoxStream;
use sc_network::{
ObservedRole, ReputationChange, PeerId,
Event as NetworkEvent,
};
use sp_runtime::ConsensusEngineId;
use polkadot_subsystem::{
FromOverseer, OverseerSignal, Subsystem, SubsystemContext, SpawnedSubsystem, SubsystemError,
SubsystemResult,
};
use polkadot_subsystem::messages::{NetworkBridgeEvent, NetworkBridgeMessage, AllMessages};
use node_primitives::{ProtocolId, View};
use polkadot_primitives::v1::{Block, Hash};
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use std::collections::btree_map::{BTreeMap, Entry as BEntry};
use std::collections::hash_map::{HashMap, Entry as HEntry};
use std::pin::Pin;
use std::sync::Arc;
/// The maximum amount of heads a peer is allowed to have in their view at any time.
///
/// We use the same limit to compute the view sent to peers locally.
const MAX_VIEW_HEADS: usize = 5;
/// The engine ID of the polkadot network protocol.
pub const POLKADOT_ENGINE_ID: ConsensusEngineId = *b"dot2";
/// The protocol name.
pub const POLKADOT_PROTOCOL_NAME: &[u8] = b"/polkadot/2";
const MALFORMED_MESSAGE_COST: ReputationChange
= ReputationChange::new(-500, "Malformed Network-bridge message");
const UNKNOWN_PROTO_COST: ReputationChange
= ReputationChange::new(-50, "Message sent to unknown protocol");
const MALFORMED_VIEW_COST: ReputationChange
= ReputationChange::new(-500, "Malformed view");
/// Messages received on the network.
#[derive(Debug, Encode, Decode, Clone)]
pub enum WireMessage {
/// A message from a peer on a specific protocol.
#[codec(index = "1")]
ProtocolMessage(ProtocolId, Vec<u8>),
/// A view update from a peer.
#[codec(index = "2")]
ViewUpdate(View),
}
/// Information about the notifications protocol. Should be used during network configuration
/// or shortly after startup to register the protocol with the network service.
pub fn notifications_protocol_info() -> (ConsensusEngineId, std::borrow::Cow<'static, [u8]>) {
(POLKADOT_ENGINE_ID, POLKADOT_PROTOCOL_NAME.into())
}
/// An action to be carried out by the network.
#[derive(PartialEq)]
pub enum NetworkAction {
/// Note a change in reputation for a peer.
ReputationChange(PeerId, ReputationChange),
/// Write a notification to a given peer.
WriteNotification(PeerId, Vec<u8>),
}
/// An abstraction over networking for the purposes of this subsystem.
pub trait Network: Send + 'static {
/// Get a stream of all events occurring on the network. This may include events unrelated
/// to the Polkadot protocol - the user of this function should filter only for events related
/// to the [`POLKADOT_ENGINE_ID`](POLKADOT_ENGINE_ID).
fn event_stream(&mut self) -> BoxStream<'static, NetworkEvent>;
/// Get access to an underlying sink for all network actions.
fn action_sink<'a>(&'a mut self) -> Pin<
Box<dyn Sink<NetworkAction, Error = SubsystemError> + Send + 'a>
>;
/// Report a given peer as either beneficial (+) or costly (-) according to the given scalar.
fn report_peer(&mut self, who: PeerId, cost_benefit: ReputationChange)
-> BoxFuture<SubsystemResult<()>>
{
async move {
self.action_sink().send(NetworkAction::ReputationChange(who, cost_benefit)).await
}.boxed()
}
/// Write a notification to a peer on the [`POLKADOT_ENGINE_ID`](POLKADOT_ENGINE_ID) topic.
fn write_notification(&mut self, who: PeerId, message: Vec<u8>)
-> BoxFuture<SubsystemResult<()>>
{
async move {
self.action_sink().send(NetworkAction::WriteNotification(who, message)).await
}.boxed()
}
}
impl Network for Arc<sc_network::NetworkService<Block, Hash>> {
fn event_stream(&mut self) -> BoxStream<'static, NetworkEvent> {
sc_network::NetworkService::event_stream(self, "polkadot-network-bridge").boxed()
}
fn action_sink<'a>(&'a mut self)
-> Pin<Box<dyn Sink<NetworkAction, Error = SubsystemError> + Send + 'a>>
{
use futures::task::{Poll, Context};
// wrapper around a NetworkService to make it act like a sink.
struct ActionSink<'b>(&'b sc_network::NetworkService<Block, Hash>);
impl<'b> Sink<NetworkAction> for ActionSink<'b> {
type Error = SubsystemError;
fn poll_ready(self: Pin<&mut Self>, _: &mut Context) -> Poll<SubsystemResult<()>> {
Poll::Ready(Ok(()))
}
fn start_send(self: Pin<&mut Self>, action: NetworkAction) -> SubsystemResult<()> {
match action {
NetworkAction::ReputationChange(peer, cost_benefit) => self.0.report_peer(
peer,
cost_benefit,
),
NetworkAction::WriteNotification(peer, message) => self.0.write_notification(
peer,
POLKADOT_ENGINE_ID,
message,
),
}
Ok(())
}
fn poll_flush(self: Pin<&mut Self>, _: &mut Context) -> Poll<SubsystemResult<()>> {
Poll::Ready(Ok(()))
}
fn poll_close(self: Pin<&mut Self>, _: &mut Context) -> Poll<SubsystemResult<()>> {
Poll::Ready(Ok(()))
}
}
Box::pin(ActionSink(&**self))
}
}
/// The network bridge subsystem.
pub struct NetworkBridge<N>(N);
impl<N> NetworkBridge<N> {
/// Create a new network bridge subsystem with underlying network service.
///
/// This assumes that the network service has had the notifications protocol for the network
/// bridge already registered. See [`notifications_protocol_info`](notifications_protocol_info).
pub fn new(net_service: N) -> Self {
NetworkBridge(net_service)
}
}
impl<Net, Context> Subsystem<Context> for NetworkBridge<Net>
where
Net: Network,
Context: SubsystemContext<Message=NetworkBridgeMessage>,
{
fn start(self, ctx: Context) -> SpawnedSubsystem {
// Swallow error because failure is fatal to the node and we log with more precision
// within `run_network`.
SpawnedSubsystem {
name: "network-bridge-subsystem",
future: run_network(self.0, ctx).map(|_| ()).boxed(),
}
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}
}
struct PeerData {
/// Latest view sent by the peer.
view: View,
/// The role of the peer.
role: ObservedRole,
}
#[derive(Debug)]
enum Action {
RegisterEventProducer(ProtocolId, fn(NetworkBridgeEvent) -> AllMessages),
SendMessage(Vec<PeerId>, ProtocolId, Vec<u8>),
ReportPeer(PeerId, ReputationChange),
StartWork(Hash),
StopWork(Hash),
PeerConnected(PeerId, ObservedRole),
PeerDisconnected(PeerId),
PeerMessages(PeerId, Vec<WireMessage>),
Abort,
}
fn action_from_overseer_message(
res: polkadot_subsystem::SubsystemResult<FromOverseer<NetworkBridgeMessage>>,
) -> Action {
match res {
Ok(FromOverseer::Signal(OverseerSignal::StartWork(relay_parent)))
=> Action::StartWork(relay_parent),
Ok(FromOverseer::Signal(OverseerSignal::StopWork(relay_parent)))
=> Action::StopWork(relay_parent),
Ok(FromOverseer::Signal(OverseerSignal::Conclude)) => Action::Abort,
Ok(FromOverseer::Communication { msg }) => match msg {
NetworkBridgeMessage::RegisterEventProducer(protocol_id, message_producer)
=> Action::RegisterEventProducer(protocol_id, message_producer),
NetworkBridgeMessage::ReportPeer(peer, rep) => Action::ReportPeer(peer, rep),
NetworkBridgeMessage::SendMessage(peers, protocol, message)
=> Action::SendMessage(peers, protocol, message),
},
Err(e) => {
log::warn!("Shutting down Network Bridge due to error {:?}", e);
Action::Abort
}
}
}
fn action_from_network_message(event: Option<NetworkEvent>) -> Option<Action> {
match event {
None => {
log::info!("Shutting down Network Bridge: underlying event stream concluded");
Some(Action::Abort)
}
Some(NetworkEvent::Dht(_)) => None,
Some(NetworkEvent::NotificationStreamOpened { remote, engine_id, role }) => {
if engine_id == POLKADOT_ENGINE_ID {
Some(Action::PeerConnected(remote, role))
} else {
None
}
}
Some(NetworkEvent::NotificationStreamClosed { remote, engine_id }) => {
if engine_id == POLKADOT_ENGINE_ID {
Some(Action::PeerDisconnected(remote))
} else {
None
}
}
Some(NetworkEvent::NotificationsReceived { remote, messages }) => {
let v: Result<Vec<_>, _> = messages.iter()
.filter(|(engine_id, _)| engine_id == &POLKADOT_ENGINE_ID)
.map(|(_, msg_bytes)| WireMessage::decode(&mut msg_bytes.as_ref()))
.collect();
match v {
Err(_) => Some(Action::ReportPeer(remote, MALFORMED_MESSAGE_COST)),
Ok(v) => if v.is_empty() {
None
} else {
Some(Action::PeerMessages(remote, v))
}
}
}
}
}
fn construct_view(live_heads: &[Hash]) -> View {
View(live_heads.iter().rev().take(MAX_VIEW_HEADS).cloned().collect())
}
async fn dispatch_update_to_all(
update: NetworkBridgeEvent,
event_producers: impl IntoIterator<Item=&fn(NetworkBridgeEvent) -> AllMessages>,
ctx: &mut impl SubsystemContext<Message=NetworkBridgeMessage>,
) -> polkadot_subsystem::SubsystemResult<()> {
// collect messages here to avoid the borrow lasting across await boundary.
let messages: Vec<_> = event_producers.into_iter()
.map(|producer| producer(update.clone()))
.collect();
ctx.send_messages(messages).await
}
async fn update_view(
peers: &HashMap<PeerId, PeerData>,
live_heads: &[Hash],
net: &mut impl Network,
local_view: &mut View,
) -> SubsystemResult<Option<NetworkBridgeEvent>> {
let new_view = construct_view(live_heads);
if *local_view == new_view { return Ok(None) }
*local_view = new_view.clone();
let message = WireMessage::ViewUpdate(new_view.clone()).encode();
let notifications = peers.keys().cloned()
.map(move |peer| Ok(NetworkAction::WriteNotification(peer, message.clone())));
net.action_sink().send_all(&mut stream::iter(notifications)).await?;
Ok(Some(NetworkBridgeEvent::OurViewChange(local_view.clone())))
}
async fn run_network<N: Network>(
mut net: N,
mut ctx: impl SubsystemContext<Message=NetworkBridgeMessage>,
) -> SubsystemResult<()> {
let mut event_stream = net.event_stream().fuse();
// Most recent heads are at the back.
let mut live_heads = Vec::with_capacity(MAX_VIEW_HEADS);
let mut local_view = View(Vec::new());
let mut peers: HashMap<PeerId, PeerData> = HashMap::new();
let mut event_producers = BTreeMap::new();
loop {
let action = {
let subsystem_next = ctx.recv().fuse();
let mut net_event_next = event_stream.next().fuse();
futures::pin_mut!(subsystem_next);
let action = futures::select! {
subsystem_msg = subsystem_next => Some(action_from_overseer_message(subsystem_msg)),
net_event = net_event_next => action_from_network_message(net_event),
};
match action {
Some(a) => a,
None => continue,
}
};
match action {
Action::RegisterEventProducer(protocol_id, event_producer) => {
// insert only if none present.
if let BEntry::Vacant(entry) = event_producers.entry(protocol_id) {
let event_producer = entry.insert(event_producer);
// send the event producer information on all connected peers.
let mut messages = Vec::with_capacity(peers.len() * 2);
for (peer, data) in &peers {
messages.push(event_producer(
NetworkBridgeEvent::PeerConnected(peer.clone(), data.role.clone())
));
messages.push(event_producer(
NetworkBridgeEvent::PeerViewChange(peer.clone(), data.view.clone())
));
}
ctx.send_messages(messages).await?;
}
}
Action::SendMessage(peers, protocol, message) => {
let mut message_producer = stream::iter({
let n_peers = peers.len();
let mut message = Some(
WireMessage::ProtocolMessage(protocol, message).encode()
);
peers.iter().cloned().enumerate().map(move |(i, peer)| {
// optimization: avoid cloning the message for the last peer in the
// list. The message payload can be quite large. If the underlying
// network used `Bytes` this would not be necessary.
let message = if i == n_peers - 1 {
message.take()
.expect("Only taken in last iteration of loop, never afterwards; qed")
} else {
message.as_ref()
.expect("Only taken in last iteration of loop, we are not there yet; qed")
.clone()
};
Ok(NetworkAction::WriteNotification(peer, message))
})
});
net.action_sink().send_all(&mut message_producer).await?;
}
Action::ReportPeer(peer, rep) => {
net.report_peer(peer, rep).await?;
}
Action::StartWork(relay_parent) => {
live_heads.push(relay_parent);
if let Some(view_update)
= update_view(&peers, &live_heads, &mut net, &mut local_view).await?
{
if let Err(e) = dispatch_update_to_all(
view_update,
event_producers.values(),
&mut ctx,
).await {
log::warn!("Aborting - Failure to dispatch messages to overseer");
return Err(e)
}
}
}
Action::StopWork(relay_parent) => {
live_heads.retain(|h| h != &relay_parent);
if let Some(view_update)
= update_view(&peers, &live_heads, &mut net, &mut local_view).await?
{
if let Err(e) = dispatch_update_to_all(
view_update,
event_producers.values(),
&mut ctx,
).await {
log::warn!("Aborting - Failure to dispatch messages to overseer");
return Err(e)
}
}
}
Action::PeerConnected(peer, role) => {
match peers.entry(peer.clone()) {
HEntry::Occupied(_) => continue,
HEntry::Vacant(vacant) => {
vacant.insert(PeerData {
view: View(Vec::new()),
role: role.clone(),
});
if let Err(e) = dispatch_update_to_all(
NetworkBridgeEvent::PeerConnected(peer, role),
event_producers.values(),
&mut ctx,
).await {
log::warn!("Aborting - Failure to dispatch messages to overseer");
return Err(e)
}
}
}
}
Action::PeerDisconnected(peer) => {
if peers.remove(&peer).is_some() {
if let Err(e) = dispatch_update_to_all(
NetworkBridgeEvent::PeerDisconnected(peer),
event_producers.values(),
&mut ctx,
).await {
log::warn!("Aborting - Failure to dispatch messages to overseer");
return Err(e)
}
}
},
Action::PeerMessages(peer, messages) => {
let peer_data = match peers.get_mut(&peer) {
None => continue,
Some(d) => d,
};
let mut outgoing_messages = Vec::with_capacity(messages.len());
for message in messages {
match message {
WireMessage::ViewUpdate(new_view) => {
if new_view.0.len() > MAX_VIEW_HEADS {
net.report_peer(
peer.clone(),
MALFORMED_VIEW_COST,
).await?;
continue
}
if new_view == peer_data.view { continue }
peer_data.view = new_view;
let update = NetworkBridgeEvent::PeerViewChange(
peer.clone(),
peer_data.view.clone(),
);
outgoing_messages.extend(
event_producers.values().map(|producer| producer(update.clone()))
);
}
WireMessage::ProtocolMessage(protocol, message) => {
let message = match event_producers.get(&protocol) {
Some(producer) => Some(producer(
NetworkBridgeEvent::PeerMessage(peer.clone(), message)
)),
None => {
net.report_peer(
peer.clone(),
UNKNOWN_PROTO_COST,
).await?;
None
}
};
if let Some(message) = message {
outgoing_messages.push(message);
}
}
}
}
let send_messages = ctx.send_messages(outgoing_messages);
if let Err(e) = send_messages.await {
log::warn!("Aborting - Failure to dispatch messages to overseer");
return Err(e)
}
},
Action::Abort => return Ok(()),
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use futures::channel::mpsc;
use futures::executor;
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use std::sync::Arc;
use parking_lot::Mutex;
use assert_matches::assert_matches;
use polkadot_subsystem::messages::{StatementDistributionMessage, BitfieldDistributionMessage};
use subsystem_test::{SingleItemSink, SingleItemStream};
// The subsystem's view of the network - only supports a single call to `event_stream`.
struct TestNetwork {
net_events: Arc<Mutex<Option<SingleItemStream<NetworkEvent>>>>,
action_tx: mpsc::UnboundedSender<NetworkAction>,
}
// The test's view of the network. This receives updates from the subsystem in the form
// of `NetworkAction`s.
struct TestNetworkHandle {
action_rx: mpsc::UnboundedReceiver<NetworkAction>,
net_tx: SingleItemSink<NetworkEvent>,
}
fn new_test_network() -> (
TestNetwork,
TestNetworkHandle,
) {
let (net_tx, net_rx) = subsystem_test::single_item_sink();
let (action_tx, action_rx) = mpsc::unbounded();
(
TestNetwork {
net_events: Arc::new(Mutex::new(Some(net_rx))),
action_tx,
},
TestNetworkHandle {
action_rx,
net_tx,
},
)
}
impl Network for TestNetwork {
fn event_stream(&mut self) -> BoxStream<'static, NetworkEvent> {
self.net_events.lock()
.take()
.expect("Subsystem made more than one call to `event_stream`")
.boxed()
}
fn action_sink<'a>(&'a mut self)
-> Pin<Box<dyn Sink<NetworkAction, Error = SubsystemError> + Send + 'a>>
{
Box::pin((&mut self.action_tx).sink_map_err(Into::into))
}
}
impl TestNetworkHandle {
// Get the next network action.
async fn next_network_action(&mut self) -> NetworkAction {
self.action_rx.next().await.expect("subsystem concluded early")
}
// Wait for the next N network actions.
async fn next_network_actions(&mut self, n: usize) -> Vec<NetworkAction> {
let mut v = Vec::with_capacity(n);
for _ in 0..n {
v.push(self.next_network_action().await);
}
v
}
async fn connect_peer(&mut self, peer: PeerId, role: ObservedRole) {
self.send_network_event(NetworkEvent::NotificationStreamOpened {
remote: peer,
engine_id: POLKADOT_ENGINE_ID,
role,
}).await;
}
async fn disconnect_peer(&mut self, peer: PeerId) {
self.send_network_event(NetworkEvent::NotificationStreamClosed {
remote: peer,
engine_id: POLKADOT_ENGINE_ID,
}).await;
}
async fn peer_message(&mut self, peer: PeerId, message: Vec<u8>) {
self.send_network_event(NetworkEvent::NotificationsReceived {
remote: peer,
messages: vec![(POLKADOT_ENGINE_ID, message.into())],
}).await;
}
async fn send_network_event(&mut self, event: NetworkEvent) {
self.net_tx.send(event).await.expect("subsystem concluded early");
}
}
// network actions are sensitive to ordering of `PeerId`s within a `HashMap`, so
// we need to use this to prevent fragile reliance on peer ordering.
fn network_actions_contains(actions: &[NetworkAction], action: &NetworkAction) -> bool {
actions.iter().find(|&x| x == action).is_some()
}
struct TestHarness {
network_handle: TestNetworkHandle,
virtual_overseer: subsystem_test::TestSubsystemContextHandle<NetworkBridgeMessage>,
}
fn test_harness<T: Future<Output=()>>(test: impl FnOnce(TestHarness) -> T) {
let pool = sp_core::testing::SpawnBlockingExecutor::new();
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let (network, network_handle) = new_test_network();
let (context, virtual_overseer) = subsystem_test::make_subsystem_context(pool);
let network_bridge = run_network(
network,
context,
)
.map_err(|_| panic!("subsystem execution failed"))
.map(|_| ());
let test_fut = test(TestHarness {
network_handle,
virtual_overseer,
});
futures::pin_mut!(test_fut);
futures::pin_mut!(network_bridge);
executor::block_on(future::select(test_fut, network_bridge));
}
#[test]
fn sends_view_updates_to_peers() {
test_harness(|test_harness| async move {
let TestHarness { mut network_handle, mut virtual_overseer } = test_harness;
let peer_a = PeerId::random();
let peer_b = PeerId::random();
network_handle.connect_peer(peer_a.clone(), ObservedRole::Full).await;
network_handle.connect_peer(peer_b.clone(), ObservedRole::Full).await;
let hash_a = Hash::from([1; 32]);
virtual_overseer.send(FromOverseer::Signal(OverseerSignal::StartWork(hash_a))).await;
let actions = network_handle.next_network_actions(2).await;
let wire_message = WireMessage::ViewUpdate(View(vec![hash_a])).encode();
assert!(network_actions_contains(
&actions,
&NetworkAction::WriteNotification(peer_a, wire_message.clone()),
));
assert!(network_actions_contains(
&actions,
&NetworkAction::WriteNotification(peer_b, wire_message.clone()),
));
});
}
#[test]
fn peer_view_updates_sent_via_overseer() {
test_harness(|test_harness| async move {
let TestHarness {
mut network_handle,
mut virtual_overseer,
} = test_harness;
let peer = PeerId::random();
let proto_statement = *b"abcd";
let proto_bitfield = *b"wxyz";
network_handle.connect_peer(peer.clone(), ObservedRole::Full).await;
virtual_overseer.send(FromOverseer::Communication {
msg: NetworkBridgeMessage::RegisterEventProducer(
proto_statement,
|event| AllMessages::StatementDistribution(
StatementDistributionMessage::NetworkBridgeUpdate(event)
)
),
}).await;
virtual_overseer.send(FromOverseer::Communication {
msg: NetworkBridgeMessage::RegisterEventProducer(
proto_bitfield,
|event| AllMessages::BitfieldDistribution(
BitfieldDistributionMessage::NetworkBridgeUpdate(event)
)
),
}).await;
let view = View(vec![Hash::from([1u8; 32])]);
// bridge will inform about all previously-connected peers.
{
assert_matches!(
virtual_overseer.recv().await,
AllMessages::StatementDistribution(
StatementDistributionMessage::NetworkBridgeUpdate(
NetworkBridgeEvent::PeerConnected(p, ObservedRole::Full)
)
) if p == peer
);
assert_matches!(
virtual_overseer.recv().await,
AllMessages::StatementDistribution(
StatementDistributionMessage::NetworkBridgeUpdate(
NetworkBridgeEvent::PeerViewChange(p, v)
)
) if p == peer && v == View(Default::default())
);
assert_matches!(
virtual_overseer.recv().await,
AllMessages::BitfieldDistribution(
BitfieldDistributionMessage::NetworkBridgeUpdate(
NetworkBridgeEvent::PeerConnected(p, ObservedRole::Full)
)
) if p == peer
);
assert_matches!(
virtual_overseer.recv().await,
AllMessages::BitfieldDistribution(
BitfieldDistributionMessage::NetworkBridgeUpdate(
NetworkBridgeEvent::PeerViewChange(p, v)
)
) if p == peer && v == View(Default::default())
);
}
network_handle.peer_message(
peer.clone(),
WireMessage::ViewUpdate(view.clone()).encode(),
).await;
// statement distribution message comes first because handlers are ordered by
// protocol ID.
assert_matches!(
virtual_overseer.recv().await,
AllMessages::StatementDistribution(
StatementDistributionMessage::NetworkBridgeUpdate(
NetworkBridgeEvent::PeerViewChange(p, v)
)
) => {
assert_eq!(p, peer);
assert_eq!(v, view);
}
);
assert_matches!(
virtual_overseer.recv().await,
AllMessages::BitfieldDistribution(
BitfieldDistributionMessage::NetworkBridgeUpdate(
NetworkBridgeEvent::PeerViewChange(p, v)
)
) => {
assert_eq!(p, peer);
assert_eq!(v, view);
}
);
});
}
#[test]
fn peer_messages_sent_via_overseer() {
test_harness(|test_harness| async move {
let TestHarness {
mut network_handle,
mut virtual_overseer,
} = test_harness;
let peer = PeerId::random();
let proto_statement = *b"abcd";
let proto_bitfield = *b"wxyz";
network_handle.connect_peer(peer.clone(), ObservedRole::Full).await;
virtual_overseer.send(FromOverseer::Communication {
msg: NetworkBridgeMessage::RegisterEventProducer(
proto_statement,
|event| AllMessages::StatementDistribution(
StatementDistributionMessage::NetworkBridgeUpdate(event)
)
),
}).await;
virtual_overseer.send(FromOverseer::Communication {
msg: NetworkBridgeMessage::RegisterEventProducer(
proto_bitfield,
|event| AllMessages::BitfieldDistribution(
BitfieldDistributionMessage::NetworkBridgeUpdate(event)
)
),
}).await;
// bridge will inform about all previously-connected peers.
{
assert_matches!(
virtual_overseer.recv().await,
AllMessages::StatementDistribution(
StatementDistributionMessage::NetworkBridgeUpdate(
NetworkBridgeEvent::PeerConnected(p, ObservedRole::Full)
)
) if p == peer
);
assert_matches!(
virtual_overseer.recv().await,
AllMessages::StatementDistribution(
StatementDistributionMessage::NetworkBridgeUpdate(
NetworkBridgeEvent::PeerViewChange(p, v)
)
) if p == peer && v == View(Default::default())
);
assert_matches!(
virtual_overseer.recv().await,
AllMessages::BitfieldDistribution(
BitfieldDistributionMessage::NetworkBridgeUpdate(
NetworkBridgeEvent::PeerConnected(p, ObservedRole::Full)
)
) if p == peer
);
assert_matches!(
virtual_overseer.recv().await,
AllMessages::BitfieldDistribution(
BitfieldDistributionMessage::NetworkBridgeUpdate(
NetworkBridgeEvent::PeerViewChange(p, v)
)
) if p == peer && v == View(Default::default())
);
}
let payload = vec![1, 2, 3];
network_handle.peer_message(
peer.clone(),
WireMessage::ProtocolMessage(proto_statement, payload.clone()).encode(),
).await;
network_handle.disconnect_peer(peer.clone()).await;
// statement distribution message comes first because handlers are ordered by
// protocol ID, and then a disconnection event comes - indicating that the message
// was only sent to the correct protocol.
assert_matches!(
virtual_overseer.recv().await,
AllMessages::StatementDistribution(
StatementDistributionMessage::NetworkBridgeUpdate(
NetworkBridgeEvent::PeerMessage(p, m)
)
) => {
assert_eq!(p, peer);
assert_eq!(m, payload);
}
);
assert_matches!(
virtual_overseer.recv().await,
AllMessages::StatementDistribution(
StatementDistributionMessage::NetworkBridgeUpdate(
NetworkBridgeEvent::PeerDisconnected(p)
)
) => {
assert_eq!(p, peer);
}
);
});
}
}