mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
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Andronik Ordian
ad9c02886d
* gossip-support: gossip topology * some fixes * handle view update for newly added gossip peers * fix neighbors calculation * fix test * resolve TODOs * typo * guide updates * spaces in the guide * sneaky spaces * hash randomness * address some review nits * use unbounded in bridge for subsystem msg
88 lines
3.5 KiB
Rust
88 lines
3.5 KiB
Rust
// Copyright 2017-2021 Parity Technologies (UK) Ltd.
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// This file is part of Polkadot.
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// Polkadot is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Polkadot is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Polkadot. If not, see <http://www.gnu.org/licenses/>.
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use std::convert::TryFrom;
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use std::collections::HashSet;
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pub use sc_network::{ReputationChange, PeerId};
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use polkadot_node_network_protocol::{WrongVariant, ObservedRole, OurView, View};
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use polkadot_primitives::v1::AuthorityDiscoveryId;
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/// Events from network.
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#[derive(Debug, Clone, PartialEq)]
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pub enum NetworkBridgeEvent<M> {
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/// A peer has connected.
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PeerConnected(PeerId, ObservedRole, Option<AuthorityDiscoveryId>),
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/// A peer has disconnected.
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PeerDisconnected(PeerId),
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/// Our neighbors in the new gossip topology.
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/// We're not necessarily connected to all of them.
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///
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/// This message is issued only on the validation peer set.
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///
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/// Note, that the distribution subsystems need to handle the last
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/// view update of the newly added gossip peers manually.
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NewGossipTopology(HashSet<PeerId>),
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/// Peer has sent a message.
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PeerMessage(PeerId, M),
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/// Peer's `View` has changed.
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PeerViewChange(PeerId, View),
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/// Our view has changed.
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OurViewChange(OurView),
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}
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impl<M> NetworkBridgeEvent<M> {
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/// Focus an overarching network-bridge event into some more specific variant.
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///
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/// This tries to transform M in `PeerMessage` to a message type specific to a subsystem.
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/// It is used to dispatch events coming from a peer set to the various subsystems that are
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/// handled within that peer set. More concretely a `ValidationProtocol` will be transformed
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/// for example into a `BitfieldDistributionMessage` in case of the `BitfieldDistribution`
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/// constructor.
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///
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/// Therefore a NetworkBridgeEvent<ValidationProtocol> will become for example a
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/// NetworkBridgeEvent<BitfieldDistributionMessage>, with the more specific message type
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/// `BitfieldDistributionMessage`.
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///
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/// This acts as a call to `clone`, except in the case where the event is a message event,
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/// in which case the clone can be expensive and it only clones if the message type can
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/// be focused.
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pub fn focus<'a, T>(&'a self) -> Result<NetworkBridgeEvent<T>, WrongVariant>
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where T: 'a + Clone, &'a T: TryFrom<&'a M, Error = WrongVariant>
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{
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Ok(match *self {
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NetworkBridgeEvent::PeerConnected(ref peer, ref role, ref authority_id)
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=> NetworkBridgeEvent::PeerConnected(peer.clone(), role.clone(), authority_id.clone()),
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NetworkBridgeEvent::PeerDisconnected(ref peer)
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=> NetworkBridgeEvent::PeerDisconnected(peer.clone()),
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NetworkBridgeEvent::NewGossipTopology(ref peers)
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=> NetworkBridgeEvent::NewGossipTopology(peers.clone()),
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NetworkBridgeEvent::PeerMessage(ref peer, ref msg)
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=> NetworkBridgeEvent::PeerMessage(peer.clone(), <&'a T>::try_from(msg)?.clone()),
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NetworkBridgeEvent::PeerViewChange(ref peer, ref view)
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=> NetworkBridgeEvent::PeerViewChange(peer.clone(), view.clone()),
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NetworkBridgeEvent::OurViewChange(ref view)
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=> NetworkBridgeEvent::OurViewChange(view.clone()),
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})
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}
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}
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