reth_network_api/events.rs
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//! API related to listening for network events.
use reth_eth_wire_types::{
message::RequestPair, BlockBodies, BlockHeaders, Capabilities, DisconnectReason, EthMessage,
EthNetworkPrimitives, EthVersion, GetBlockBodies, GetBlockHeaders, GetNodeData,
GetPooledTransactions, GetReceipts, NetworkPrimitives, NodeData, PooledTransactions, Receipts,
Status,
};
use reth_ethereum_forks::ForkId;
use reth_network_p2p::error::{RequestError, RequestResult};
use reth_network_peers::PeerId;
use reth_network_types::PeerAddr;
use reth_tokio_util::EventStream;
use std::{
fmt,
net::SocketAddr,
pin::Pin,
sync::Arc,
task::{Context, Poll},
};
use tokio::sync::{mpsc, oneshot};
use tokio_stream::{wrappers::UnboundedReceiverStream, Stream, StreamExt};
/// A boxed stream of network peer events that provides a type-erased interface.
pub struct PeerEventStream(Pin<Box<dyn Stream<Item = PeerEvent> + Send + Sync>>);
impl fmt::Debug for PeerEventStream {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("PeerEventStream").finish_non_exhaustive()
}
}
impl PeerEventStream {
/// Create a new stream [`PeerEventStream`] by converting the provided stream's items into peer
/// events [`PeerEvent`]
pub fn new<S, T>(stream: S) -> Self
where
S: Stream<Item = T> + Send + Sync + 'static,
T: Into<PeerEvent> + 'static,
{
let mapped_stream = stream.map(Into::into);
Self(Box::pin(mapped_stream))
}
}
impl Stream for PeerEventStream {
type Item = PeerEvent;
fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
self.0.as_mut().poll_next(cx)
}
}
/// Represents information about an established peer session.
#[derive(Debug, Clone)]
pub struct SessionInfo {
/// The identifier of the peer to which a session was established.
pub peer_id: PeerId,
/// The remote addr of the peer to which a session was established.
pub remote_addr: SocketAddr,
/// The client version of the peer to which a session was established.
pub client_version: Arc<str>,
/// Capabilities the peer announced.
pub capabilities: Arc<Capabilities>,
/// The status of the peer to which a session was established.
pub status: Arc<Status>,
/// Negotiated eth version of the session.
pub version: EthVersion,
}
/// (Non-exhaustive) List of the different events emitted by the network that are of interest for
/// subscribers.
///
/// This includes any event types that may be relevant to tasks, for metrics, keep track of peers
/// etc.
#[derive(Debug, Clone)]
pub enum PeerEvent {
/// Closed the peer session.
SessionClosed {
/// The identifier of the peer to which a session was closed.
peer_id: PeerId,
/// Why the disconnect was triggered
reason: Option<DisconnectReason>,
},
/// Established a new session with the given peer.
SessionEstablished(SessionInfo),
/// Event emitted when a new peer is added
PeerAdded(PeerId),
/// Event emitted when a new peer is removed
PeerRemoved(PeerId),
}
/// (Non-exhaustive) Network events representing peer lifecycle events and session requests.
#[derive(Debug)]
pub enum NetworkEvent<R = PeerRequest> {
/// Basic peer lifecycle event.
Peer(PeerEvent),
/// Session established with requests.
ActivePeerSession {
/// Session information
info: SessionInfo,
/// A request channel to the session task.
messages: PeerRequestSender<R>,
},
}
impl<R> Clone for NetworkEvent<R> {
fn clone(&self) -> Self {
match self {
Self::Peer(event) => Self::Peer(event.clone()),
Self::ActivePeerSession { info, messages } => {
Self::ActivePeerSession { info: info.clone(), messages: messages.clone() }
}
}
}
}
impl<R> From<NetworkEvent<R>> for PeerEvent {
fn from(event: NetworkEvent<R>) -> Self {
match event {
NetworkEvent::Peer(peer_event) => peer_event,
NetworkEvent::ActivePeerSession { info, .. } => Self::SessionEstablished(info),
}
}
}
/// Provides peer event subscription for the network.
#[auto_impl::auto_impl(&, Arc)]
pub trait NetworkPeersEvents: Send + Sync {
/// Creates a new peer event listener stream.
fn peer_events(&self) -> PeerEventStream;
}
/// Provides event subscription for the network.
#[auto_impl::auto_impl(&, Arc)]
pub trait NetworkEventListenerProvider: NetworkPeersEvents {
/// The primitive types to use in the `PeerRequest` used in the stream.
type Primitives: NetworkPrimitives;
/// Creates a new [`NetworkEvent`] listener channel.
fn event_listener(&self) -> EventStream<NetworkEvent<PeerRequest<Self::Primitives>>>;
/// Returns a new [`DiscoveryEvent`] stream.
///
/// This stream yields [`DiscoveryEvent`]s for each peer that is discovered.
fn discovery_listener(&self) -> UnboundedReceiverStream<DiscoveryEvent>;
}
/// Events produced by the `Discovery` manager.
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum DiscoveryEvent {
/// Discovered a node
NewNode(DiscoveredEvent),
/// Retrieved a [`ForkId`] from the peer via ENR request, See <https://eips.ethereum.org/EIPS/eip-868>
EnrForkId(PeerId, ForkId),
}
/// Represents events related to peer discovery in the network.
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum DiscoveredEvent {
/// Indicates that a new peer has been discovered and queued for potential connection.
///
/// This event is generated when the system becomes aware of a new peer
/// but hasn't yet established a connection.
///
/// # Fields
///
/// * `peer_id` - The unique identifier of the discovered peer.
/// * `addr` - The network address of the discovered peer.
/// * `fork_id` - An optional identifier for the fork that this peer is associated with. `None`
/// if the peer is not associated with a specific fork.
EventQueued {
/// The unique identifier of the discovered peer.
peer_id: PeerId,
/// The network address of the discovered peer.
addr: PeerAddr,
/// An optional identifier for the fork that this peer is associated with.
/// `None` if the peer is not associated with a specific fork.
fork_id: Option<ForkId>,
},
}
/// Protocol related request messages that expect a response
#[derive(Debug)]
pub enum PeerRequest<N: NetworkPrimitives = EthNetworkPrimitives> {
/// Requests block headers from the peer.
///
/// The response should be sent through the channel.
GetBlockHeaders {
/// The request for block headers.
request: GetBlockHeaders,
/// The channel to send the response for block headers.
response: oneshot::Sender<RequestResult<BlockHeaders<N::BlockHeader>>>,
},
/// Requests block bodies from the peer.
///
/// The response should be sent through the channel.
GetBlockBodies {
/// The request for block bodies.
request: GetBlockBodies,
/// The channel to send the response for block bodies.
response: oneshot::Sender<RequestResult<BlockBodies<N::BlockBody>>>,
},
/// Requests pooled transactions from the peer.
///
/// The response should be sent through the channel.
GetPooledTransactions {
/// The request for pooled transactions.
request: GetPooledTransactions,
/// The channel to send the response for pooled transactions.
response: oneshot::Sender<RequestResult<PooledTransactions<N::PooledTransaction>>>,
},
/// Requests `NodeData` from the peer.
///
/// The response should be sent through the channel.
GetNodeData {
/// The request for `NodeData`.
request: GetNodeData,
/// The channel to send the response for `NodeData`.
response: oneshot::Sender<RequestResult<NodeData>>,
},
/// Requests receipts from the peer.
///
/// The response should be sent through the channel.
GetReceipts {
/// The request for receipts.
request: GetReceipts,
/// The channel to send the response for receipts.
response: oneshot::Sender<RequestResult<Receipts<N::Receipt>>>,
},
}
// === impl PeerRequest ===
impl<N: NetworkPrimitives> PeerRequest<N> {
/// Invoked if we received a response which does not match the request
pub fn send_bad_response(self) {
self.send_err_response(RequestError::BadResponse)
}
/// Send an error back to the receiver.
pub fn send_err_response(self, err: RequestError) {
let _ = match self {
Self::GetBlockHeaders { response, .. } => response.send(Err(err)).ok(),
Self::GetBlockBodies { response, .. } => response.send(Err(err)).ok(),
Self::GetPooledTransactions { response, .. } => response.send(Err(err)).ok(),
Self::GetNodeData { response, .. } => response.send(Err(err)).ok(),
Self::GetReceipts { response, .. } => response.send(Err(err)).ok(),
};
}
/// Returns the [`EthMessage`] for this type
pub fn create_request_message(&self, request_id: u64) -> EthMessage<N> {
match self {
Self::GetBlockHeaders { request, .. } => {
EthMessage::GetBlockHeaders(RequestPair { request_id, message: *request })
}
Self::GetBlockBodies { request, .. } => {
EthMessage::GetBlockBodies(RequestPair { request_id, message: request.clone() })
}
Self::GetPooledTransactions { request, .. } => {
EthMessage::GetPooledTransactions(RequestPair {
request_id,
message: request.clone(),
})
}
Self::GetNodeData { request, .. } => {
EthMessage::GetNodeData(RequestPair { request_id, message: request.clone() })
}
Self::GetReceipts { request, .. } => {
EthMessage::GetReceipts(RequestPair { request_id, message: request.clone() })
}
}
}
/// Consumes the type and returns the inner [`GetPooledTransactions`] variant.
pub fn into_get_pooled_transactions(self) -> Option<GetPooledTransactions> {
match self {
Self::GetPooledTransactions { request, .. } => Some(request),
_ => None,
}
}
}
/// A Cloneable connection for sending _requests_ directly to the session of a peer.
pub struct PeerRequestSender<R = PeerRequest> {
/// id of the remote node.
pub peer_id: PeerId,
/// The Sender half connected to a session.
pub to_session_tx: mpsc::Sender<R>,
}
impl<R> Clone for PeerRequestSender<R> {
fn clone(&self) -> Self {
Self { peer_id: self.peer_id, to_session_tx: self.to_session_tx.clone() }
}
}
// === impl PeerRequestSender ===
impl<R> PeerRequestSender<R> {
/// Constructs a new sender instance that's wired to a session
pub const fn new(peer_id: PeerId, to_session_tx: mpsc::Sender<R>) -> Self {
Self { peer_id, to_session_tx }
}
/// Attempts to immediately send a message on this Sender
pub fn try_send(&self, req: R) -> Result<(), mpsc::error::TrySendError<R>> {
self.to_session_tx.try_send(req)
}
/// Returns the peer id of the remote peer.
pub const fn peer_id(&self) -> &PeerId {
&self.peer_id
}
}
impl<R> fmt::Debug for PeerRequestSender<R> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("PeerRequestSender").field("peer_id", &self.peer_id).finish_non_exhaustive()
}
}