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// This file is part of Substrate.
// Copyright (C) Parity Technologies (UK) Ltd.
// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0
// This program 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.
// This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
use std::{collections::HashSet, fmt::Debug};
use crate::ServicetoWorkerMsg;
use futures::{
channel::{mpsc, oneshot},
SinkExt,
};
use sc_network::Multiaddr;
use sc_network_types::PeerId;
use sp_authority_discovery::AuthorityId;
/// Service to interact with the [`crate::Worker`].
#[derive(Clone)]
pub struct Service {
to_worker: mpsc::Sender<ServicetoWorkerMsg>,
}
impl Debug for Service {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.debug_tuple("AuthorityDiscoveryService").finish()
}
}
/// A [`Service`] allows to interact with a [`crate::Worker`], e.g. by querying the
/// [`crate::Worker`]'s local address cache for a given [`AuthorityId`].
impl Service {
pub(crate) fn new(to_worker: mpsc::Sender<ServicetoWorkerMsg>) -> Self {
Self { to_worker }
}
/// Get the addresses for the given [`AuthorityId`] from the local address
/// cache.
///
/// Returns `None` if no entry was present or connection to the
/// [`crate::Worker`] failed.
///
/// Note: [`Multiaddr`]s returned always include a [`PeerId`] via a
/// [`sc_network_types::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<HashSet<Multiaddr>> {
let (tx, rx) = oneshot::channel();
self.to_worker
.send(ServicetoWorkerMsg::GetAddressesByAuthorityId(authority, tx))
.await
.ok()?;
rx.await.ok().flatten()
}
/// Get the [`AuthorityId`] for the given [`PeerId`] from the local address
/// cache.
///
/// Returns `None` if no entry was present or connection to the
/// [`crate::Worker`] failed.
pub async fn get_authority_ids_by_peer_id(
&mut self,
peer_id: PeerId,
) -> Option<HashSet<AuthorityId>> {
let (tx, rx) = oneshot::channel();
self.to_worker
.send(ServicetoWorkerMsg::GetAuthorityIdsByPeerId(peer_id, tx))
.await
.ok()?;
rx.await.ok().flatten()
}
}