1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146

// Copyright 2021 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/>.

//! All peersets and protocols used for parachains.

use sc_network::config::{NonDefaultSetConfig, SetConfig};
use std::{
	borrow::Cow,
	ops::{Index, IndexMut},
};
use strum::{EnumIter, IntoEnumIterator};

/// The peer-sets and thus the protocols which are used for the network.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, EnumIter)]
pub enum PeerSet {
	/// The validation peer-set is responsible for all messages related to candidate validation and
	/// communication among validators.
	Validation,
	/// The collation peer-set is used for validator<>collator communication.
	Collation,
}

/// Whether a node is an authority or not.
///
/// Peer set configuration gets adjusted accordingly.
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
pub enum IsAuthority {
	/// Node is authority.
	Yes,
	/// Node is not an authority.
	No,
}

impl PeerSet {
	/// Get `sc_network` peer set configurations for each peerset.
	///
	/// Those should be used in the network configuration to register the protocols with the
	/// network service.
	pub fn get_info(self, is_authority: IsAuthority) -> NonDefaultSetConfig {
		let protocol = self.into_protocol_name();
		let max_notification_size = 100 * 1024;

		match self {
			PeerSet::Validation => NonDefaultSetConfig {
				notifications_protocol: protocol,
				fallback_names: Vec::new(),
				max_notification_size,
				set_config: sc_network::config::SetConfig {
					// we allow full nodes to connect to validators for gossip
					// to ensure any `MIN_GOSSIP_PEERS` always include reserved peers
					// we limit the amount of non-reserved slots to be less
					// than `MIN_GOSSIP_PEERS` in total
					in_peers: super::MIN_GOSSIP_PEERS as u32 / 2 - 1,
					out_peers: super::MIN_GOSSIP_PEERS as u32 / 2 - 1,
					reserved_nodes: Vec::new(),
					non_reserved_mode: sc_network::config::NonReservedPeerMode::Accept,
				},
			},
			PeerSet::Collation => NonDefaultSetConfig {
				notifications_protocol: protocol,
				fallback_names: Vec::new(),
				max_notification_size,
				set_config: SetConfig {
					// Non-authority nodes don't need to accept incoming connections on this peer set:
					in_peers: if is_authority == IsAuthority::Yes { 25 } else { 0 },
					out_peers: 0,
					reserved_nodes: Vec::new(),
					non_reserved_mode: if is_authority == IsAuthority::Yes {
						sc_network::config::NonReservedPeerMode::Accept
					} else {
						sc_network::config::NonReservedPeerMode::Deny
					},
				},
			},
		}
	}

	/// Get the protocol name associated with each peer set as static str.
	pub const fn get_protocol_name_static(self) -> &'static str {
		match self {
			PeerSet::Validation => "/polkadot/validation/1",
			PeerSet::Collation => "/polkadot/collation/1",
		}
	}

	/// Convert a peer set into a protocol name as understood by Substrate.
	pub fn into_protocol_name(self) -> Cow<'static, str> {
		self.get_protocol_name_static().into()
	}

	/// Try parsing a protocol name into a peer set.
	pub fn try_from_protocol_name(name: &Cow<'static, str>) -> Option<PeerSet> {
		match name {
			n if n == &PeerSet::Validation.into_protocol_name() => Some(PeerSet::Validation),
			n if n == &PeerSet::Collation.into_protocol_name() => Some(PeerSet::Collation),
			_ => None,
		}
	}
}

/// A small and nifty collection that allows to store data pertaining to each peer set.
#[derive(Debug, Default)]
pub struct PerPeerSet<T> {
	validation: T,
	collation: T,
}

impl<T> Index<PeerSet> for PerPeerSet<T> {
	type Output = T;
	fn index(&self, index: PeerSet) -> &T {
		match index {
			PeerSet::Validation => &self.validation,
			PeerSet::Collation => &self.collation,
		}
	}
}

impl<T> IndexMut<PeerSet> for PerPeerSet<T> {
	fn index_mut(&mut self, index: PeerSet) -> &mut T {
		match index {
			PeerSet::Validation => &mut self.validation,
			PeerSet::Collation => &mut self.collation,
		}
	}
}

/// Get `NonDefaultSetConfig`s for all available peer sets.
///
/// Should be used during network configuration (added to [`NetworkConfiguration::extra_sets`])
/// or shortly after startup to register the protocols with the network service.
pub fn peer_sets_info(is_authority: IsAuthority) -> Vec<sc_network::config::NonDefaultSetConfig> {
	PeerSet::iter().map(|s| s.get_info(is_authority)).collect()
}