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client/authority-discovery: Remove sentry node logic (#7368)

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* client/authority-discovery: Remove sentry node logic

The notion of sentry nodes has been deprecated (see [1] for details).
This commit removes support for sentry nodes in the
`client/authority-discovery` module.

While removing `Role::Sentry` this commit also introduces
`Role::Discover`, allowing a node to discover addresses of authorities
without publishing ones own addresses. This will be needed in Polkadot
for collator nodes.

[1] https://github.com/paritytech/substrate/issues/6845

* client/authority-discovery/service: Improve PeerId comment
This commit is contained in:
Max Inden
2020-10-26 11:06:56 +01:00
committed by GitHub
parent 52a49e7f51
commit 653868c01e
6 changed files with 69 additions and 214 deletions
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substrate/client/authority-discovery/src/service.rs
+6 -6
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@@ -43,12 +43,12 @@ impl Service {
/// Returns `None` if no entry was present or connection to the
/// [`crate::Worker`] failed.
///
/// [`Multiaddr`]s returned always include a [`PeerId`] via a
/// [`libp2p::core::multiaddr:Protocol::P2p`] component. [`Multiaddr`]s
/// might differ in their [`PeerId`], e.g. when each [`Multiaddr`]
/// represents a different sentry node. This might change once support for
/// sentry nodes is removed (see
/// https://github.com/paritytech/substrate/issues/6845).
/// Note: [`Multiaddr`]s returned always include a [`PeerId`] via a
/// [`libp2p::core::multiaddr:Protocol::P2p`] component. Equality of
/// [`PeerId`]s across [`Multiaddr`]s returned by a single call is not
/// enforced today, given that there are still authorities out there
/// publishing the addresses of their sentry nodes on the DHT. In the future
/// this guarantee can be provided.
pub async fn get_addresses_by_authority_id(&mut self, authority: AuthorityId) -> Option<Vec<Multiaddr>> {
let (tx, rx) = oneshot::channel();