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Rework the event system of sc-network (#1370)

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This commit introduces a new concept called `NotificationService` which
allows Polkadot protocols to communicate with the underlying
notification protocol implementation directly, without routing events
through `NetworkWorker`. This implies that each protocol has its own
service which it uses to communicate with remote peers and that each
`NotificationService` is unique with respect to the underlying
notification protocol, meaning `NotificationService` for the transaction
protocol can only be used to send and receive transaction-related
notifications.

The `NotificationService` concept introduces two additional benefits:
  * allow protocols to start using custom handshakes
  * allow protocols to accept/reject inbound peers

Previously the validation of inbound connections was solely the
responsibility of `ProtocolController`. This caused issues with light
peers and `SyncingEngine` as `ProtocolController` would accept more
peers than `SyncingEngine` could accept which caused peers to have
differing views of their own states. `SyncingEngine` would reject excess
peers but these rejections were not properly communicated to those peers
causing them to assume that they were accepted.

With `NotificationService`, the local handshake is not sent to remote
peer if peer is rejected which allows it to detect that it was rejected.

This commit also deprecates the use of `NetworkEventStream` for all
notification-related events and going forward only DHT events are
provided through `NetworkEventStream`. If protocols wish to follow each
other's events, they must introduce additional abtractions, as is done
for GRANDPA and transactions protocols by following the syncing protocol
through `SyncEventStream`.

Fixes https://github.com/paritytech/polkadot-sdk/issues/512
Fixes https://github.com/paritytech/polkadot-sdk/issues/514
Fixes https://github.com/paritytech/polkadot-sdk/issues/515
Fixes https://github.com/paritytech/polkadot-sdk/issues/554
Fixes https://github.com/paritytech/polkadot-sdk/issues/556

---
These changes are transferred from
https://github.com/paritytech/substrate/pull/14197 but there are no
functional changes compared to that PR

---------

Co-authored-by: Dmitry Markin <dmitry@markin.tech>
Co-authored-by: Alexandru Vasile <60601340+lexnv@users.noreply.github.com>
This commit is contained in:
Aaro Altonen
2023-11-28 20:18:52 +02:00
committed by GitHub
parent ec3a61ed86
commit e71c484d5b
102 changed files with 5694 additions and 2603 deletions
Download Patch File Download Diff File Expand all files Collapse all files
substrate/bin/node/cli/src/service.rs
+18 -15
View File
@@ -370,28 +370,28 @@ pub fn new_full_base(
let shared_voter_state = rpc_setup;
let auth_disc_publish_non_global_ips = config.network.allow_non_globals_in_dht;
let mut net_config = sc_network::config::FullNetworkConfiguration::new(&config.network);
let genesis_hash = client.block_hash(0).ok().flatten().expect("Genesis block exists; qed");
let grandpa_protocol_name = grandpa::protocol_standard_name(&genesis_hash, &config.chain_spec);
net_config.add_notification_protocol(grandpa::grandpa_peers_set_config(
grandpa_protocol_name.clone(),
));
let (grandpa_protocol_config, grandpa_notification_service) =
grandpa::grandpa_peers_set_config(grandpa_protocol_name.clone());
net_config.add_notification_protocol(grandpa_protocol_config);
let statement_handler_proto = sc_network_statement::StatementHandlerPrototype::new(
genesis_hash,
config.chain_spec.fork_id(),
);
net_config.add_notification_protocol(statement_handler_proto.set_config());
let (statement_handler_proto, statement_config) =
sc_network_statement::StatementHandlerPrototype::new(
genesis_hash,
config.chain_spec.fork_id(),
);
net_config.add_notification_protocol(statement_config);
let mixnet_protocol_name =
sc_mixnet::protocol_name(genesis_hash.as_ref(), config.chain_spec.fork_id());
if let Some(mixnet_config) = &mixnet_config {
net_config.add_notification_protocol(sc_mixnet::peers_set_config(
mixnet_protocol_name.clone(),
mixnet_config,
));
}
let mixnet_notification_service = mixnet_config.as_ref().map(|mixnet_config| {
let (config, notification_service) =
sc_mixnet::peers_set_config(mixnet_protocol_name.clone(), mixnet_config);
net_config.add_notification_protocol(config);
notification_service
});
let warp_sync = Arc::new(grandpa::warp_proof::NetworkProvider::new(
backend.clone(),
@@ -422,6 +422,8 @@ pub fn new_full_base(
mixnet_protocol_name,
transaction_pool.clone(),
Some(keystore_container.keystore()),
mixnet_notification_service
.expect("`NotificationService` exists since mixnet was enabled; qed"),
);
task_manager.spawn_handle().spawn("mixnet", None, mixnet);
}
@@ -590,6 +592,7 @@ pub fn new_full_base(
link: grandpa_link,
network: network.clone(),
sync: Arc::new(sync_service.clone()),
notification_service: grandpa_notification_service,
telemetry: telemetry.as_ref().map(|x| x.handle()),
voting_rule: grandpa::VotingRulesBuilder::default().build(),
prometheus_registry: prometheus_registry.clone(),