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// Copyright 2020 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/>.
//! PoV Distribution Subsystem of Polkadot.
//!
//! This is a gossip implementation of code that is responsible for distributing PoVs
//! among validators.
#![deny(unused_crate_dependencies)]
#![warn(missing_docs)]
use polkadot_primitives::v1::{
Hash, PoV, CandidateDescriptor, ValidatorId, Id as ParaId, CoreIndex, CoreState,
};
use polkadot_subsystem::{
ActiveLeavesUpdate, OverseerSignal, SubsystemContext, SubsystemResult, SubsystemError, Subsystem,
PoVDistributionMessage, AllMessages, NetworkBridgeMessage,
use polkadot_node_subsystem_util::{
validator_discovery,
request_validators_ctx,
request_validator_groups_ctx,
request_availability_cores_ctx,
metrics::{self, prometheus},
};
use polkadot_node_network_protocol::{
v1 as protocol_v1, ReputationChange as Rep, NetworkBridgeEvent, PeerId, View,
};
use futures::prelude::*;
use futures::channel::oneshot;
use std::collections::{hash_map::{Entry, HashMap}, HashSet};
use std::sync::Arc;
#[cfg(test)]
mod tests;
const COST_APPARENT_FLOOD: Rep = Rep::new(-500, "Peer appears to be flooding us with PoV requests");
const COST_UNEXPECTED_POV: Rep = Rep::new(-500, "Peer sent us an unexpected PoV");
const COST_AWAITED_NOT_IN_VIEW: Rep
= Rep::new(-100, "Peer claims to be awaiting something outside of its view");
const BENEFIT_FRESH_POV: Rep = Rep::new(25, "Peer supplied us with an awaited PoV");
const BENEFIT_LATE_POV: Rep = Rep::new(10, "Peer supplied us with an awaited PoV, \
but was not the first to do so");
const LOG_TARGET: &str = "pov_distribution";
/// The PoV Distribution Subsystem.
pub struct PoVDistribution {
// Prometheus metrics
metrics: Metrics,
}
impl<C> Subsystem<C> for PoVDistribution
where C: SubsystemContext<Message = PoVDistributionMessage>
{
fn start(self, ctx: C) -> SpawnedSubsystem {
// Swallow error because failure is fatal to the node and we log with more precision
// within `run`.
let future = self.run(ctx)
.map_err(|e| SubsystemError::with_origin("pov-distribution", e))
.boxed();
SpawnedSubsystem {
name: "pov-distribution-subsystem",
/// A state of things going on on a per-relay-parent basis.
relay_parent_state: HashMap<Hash, BlockBasedState>,
peer_state: HashMap<PeerId, PeerState>,
/// Connect to relevant groups of validators at different relay parents.
connection_requests: validator_discovery::ConnectionRequests,
/// Metrics.
}
struct BlockBasedState {
known: HashMap<Hash, Arc<PoV>>,
/// All the PoVs we are or were fetching, coupled with channels expecting the data.
///
/// This may be an empty list, which indicates that we were once awaiting this PoV but have
/// received it already.
fetching: HashMap<Hash, Vec<oneshot::Sender<Arc<PoV>>>>,
n_validators: usize,
}
#[derive(Default)]
struct PeerState {
/// A set of awaited PoV-hashes for each relay-parent in the peer's view.
awaited: HashMap<Hash, HashSet<Hash>>,
}
fn awaiting_message(relay_parent: Hash, awaiting: Vec<Hash>)
-> protocol_v1::ValidationProtocol
{
protocol_v1::ValidationProtocol::PoVDistribution(
protocol_v1::PoVDistributionMessage::Awaiting(relay_parent, awaiting)
)
}
fn send_pov_message(relay_parent: Hash, pov_hash: Hash, pov: PoV)
-> protocol_v1::ValidationProtocol
{
protocol_v1::ValidationProtocol::PoVDistribution(
protocol_v1::PoVDistributionMessage::SendPoV(relay_parent, pov_hash, pov)
)
}
/// Handles the signal. If successful, returns `true` if the subsystem should conclude,
/// `false` otherwise.
#[tracing::instrument(level = "trace", skip(ctx, state), fields(subsystem = LOG_TARGET))]
async fn handle_signal(
state: &mut State,
ctx: &mut impl SubsystemContext<Message = PoVDistributionMessage>,
signal: OverseerSignal,
) -> SubsystemResult<bool> {
match signal {
OverseerSignal::Conclude => Ok(true),
OverseerSignal::ActiveLeaves(ActiveLeavesUpdate { activated, deactivated }) => {
let _timer = state.metrics.time_handle_signal();
for relay_parent in activated {
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match request_validators_ctx(relay_parent.clone(), ctx).await {
Ok(vals_rx) => {
let n_validators = match vals_rx.await? {
Ok(v) => v.len(),
Err(e) => {
tracing::warn!(
target: LOG_TARGET,
err = ?e,
"Error fetching validators from runtime API for active leaf",
);
// Not adding bookkeeping here might make us behave funny, but we
// shouldn't take down the node on spurious runtime API errors.
//
// and this is "behave funny" as in be bad at our job, but not in any
// slashable or security-related way.
continue;
}
};
state.relay_parent_state.insert(relay_parent, BlockBasedState {
known: HashMap::new(),
fetching: HashMap::new(),
n_validators,
});
}
asynchronous rob
committed
Err(e) => {
err = ?e,
"Error fetching validators from runtime API for active leaf",
asynchronous rob
committed
);
}
}
for relay_parent in deactivated {
state.connection_requests.remove(&relay_parent);
state.relay_parent_state.remove(&relay_parent);
}
OverseerSignal::BlockFinalized(..) => Ok(false),
}
}
/// Notify peers that we are awaiting a given PoV hash.
///
/// This only notifies peers who have the relay parent in their view.
#[tracing::instrument(level = "trace", skip(peers, ctx), fields(subsystem = LOG_TARGET))]
async fn notify_all_we_are_awaiting(
peers: &mut HashMap<PeerId, PeerState>,
ctx: &mut impl SubsystemContext<Message = PoVDistributionMessage>,
relay_parent: Hash,
pov_hash: Hash,
// We use `awaited` as a proxy for which heads are in the peer's view.
let peers_to_send: Vec<_> = peers.iter()
.filter_map(|(peer, state)| if state.awaited.contains_key(&relay_parent) {
Some(peer.clone())
} else {
None
})
.collect();
if peers_to_send.is_empty() {
return;
}
let payload = awaiting_message(relay_parent, vec![pov_hash]);
ctx.send_message(AllMessages::NetworkBridge(NetworkBridgeMessage::SendValidationMessage(
peers_to_send,
payload,
}
/// Notify one peer about everything we're awaiting at a given relay-parent.
#[tracing::instrument(level = "trace", skip(ctx, relay_parent_state), fields(subsystem = LOG_TARGET))]
async fn notify_one_we_are_awaiting_many(
peer: &PeerId,
ctx: &mut impl SubsystemContext<Message = PoVDistributionMessage>,
relay_parent_state: &HashMap<Hash, BlockBasedState>,
relay_parent: Hash,
let awaiting_hashes = relay_parent_state.get(&relay_parent).into_iter().flat_map(|s| {
// Send the peer everything we are fetching at this relay-parent
s.fetching.iter()
.filter(|(_, senders)| !senders.is_empty()) // that has not been completed already.
.map(|(pov_hash, _)| *pov_hash)
}).collect::<Vec<_>>();
if awaiting_hashes.is_empty() {
return;
}
let payload = awaiting_message(relay_parent, awaiting_hashes);
ctx.send_message(AllMessages::NetworkBridge(NetworkBridgeMessage::SendValidationMessage(
vec![peer.clone()],
payload,
}
/// Distribute a PoV to peers who are awaiting it.
#[tracing::instrument(level = "trace", skip(peers, ctx, metrics, pov), fields(subsystem = LOG_TARGET))]
async fn distribute_to_awaiting(
peers: &mut HashMap<PeerId, PeerState>,
ctx: &mut impl SubsystemContext<Message = PoVDistributionMessage>,
relay_parent: Hash,
pov_hash: Hash,
pov: &PoV,
// Send to all peers who are awaiting the PoV and have that relay-parent in their view.
//
// Also removes it from their awaiting set.
let peers_to_send: Vec<_> = peers.iter_mut()
.filter_map(|(peer, state)| state.awaited.get_mut(&relay_parent).and_then(|awaited| {
if awaited.remove(&pov_hash) {
Some(peer.clone())
} else {
None
}
}))
.collect();
if peers_to_send.is_empty() { return; }
let payload = send_pov_message(relay_parent, pov_hash, pov.clone());
ctx.send_message(AllMessages::NetworkBridge(NetworkBridgeMessage::SendValidationMessage(
peers_to_send,
payload,
metrics.on_pov_distributed();
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/// Get the Id of the Core that is assigned to the para being collated on if any
/// and the total number of cores.
async fn determine_core(
ctx: &mut impl SubsystemContext<Message = PoVDistributionMessage>,
para_id: ParaId,
relay_parent: Hash,
) -> error::Result<Option<(CoreIndex, usize)>> {
let cores = request_availability_cores_ctx(relay_parent, ctx).await?.await??;
for (idx, core) in cores.iter().enumerate() {
if let CoreState::Scheduled(occupied) = core {
if occupied.para_id == para_id {
return Ok(Some(((idx as u32).into(), cores.len())));
}
}
}
Ok(None)
}
/// Figure out a group of validators assigned to a given `ParaId`.
async fn determine_validators_for_core(
ctx: &mut impl SubsystemContext<Message = PoVDistributionMessage>,
core_index: CoreIndex,
num_cores: usize,
relay_parent: Hash,
) -> error::Result<Option<Vec<ValidatorId>>> {
let groups = request_validator_groups_ctx(relay_parent, ctx).await?.await??;
let group_index = groups.1.group_for_core(core_index, num_cores);
let connect_to_validators = match groups.0.get(group_index.0 as usize) {
Some(group) => group.clone(),
None => return Ok(None),
};
let validators = request_validators_ctx(relay_parent, ctx).await?.await??;
let validators = connect_to_validators
.into_iter()
.map(|idx| validators[idx as usize].clone())
.collect();
Ok(Some(validators))
}
async fn determine_relevant_validators(
ctx: &mut impl SubsystemContext<Message = PoVDistributionMessage>,
relay_parent: Hash,
para_id: ParaId,
) -> error::Result<Option<Vec<ValidatorId>>> {
// Determine which core the para_id is assigned to.
let (core, num_cores) = match determine_core(ctx, para_id, relay_parent).await? {
Some(core) => core,
None => {
tracing::warn!(
target: LOG_TARGET,
"Looks like no core is assigned to {:?} at {:?}",
para_id,
relay_parent,
);
return Ok(None);
}
};
determine_validators_for_core(ctx, core, num_cores, relay_parent).await
}
/// Handles a `FetchPoV` message.
#[tracing::instrument(level = "trace", skip(ctx, state, response_sender), fields(subsystem = LOG_TARGET))]
async fn handle_fetch(
state: &mut State,
ctx: &mut impl SubsystemContext<Message = PoVDistributionMessage>,
relay_parent: Hash,
descriptor: CandidateDescriptor,
response_sender: oneshot::Sender<Arc<PoV>>,
let _timer = state.metrics.time_handle_fetch();
let relay_parent_state = match state.relay_parent_state.get_mut(&relay_parent) {
Some(s) => s,
};
if let Some(pov) = relay_parent_state.known.get(&descriptor.pov_hash) {
let _ = response_sender.send(pov.clone());
}
{
match relay_parent_state.fetching.entry(descriptor.pov_hash) {
Entry::Occupied(mut e) => {
// we are already awaiting this PoV if there is an entry.
e.get_mut().push(response_sender);
}
Entry::Vacant(e) => {
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if let Ok(Some(relevant_validators)) = determine_relevant_validators(
ctx,
relay_parent,
descriptor.para_id,
).await {
// We only need one connection request per (relay_parent, para_id)
// so here we take this shortcut to avoid calling `connect_to_validators`
// more than once.
if !state.connection_requests.contains_request(&relay_parent) {
match validator_discovery::connect_to_validators(
ctx,
relay_parent,
relevant_validators.clone(),
).await {
Ok(new_connection_request) => {
state.connection_requests.put(relay_parent, new_connection_request);
}
Err(e) => {
tracing::debug!(
target: LOG_TARGET,
"Failed to create a validator connection request {:?}",
e,
);
}
}
}
e.insert(vec![response_sender]);
}
}
}
}
if relay_parent_state.fetching.len() > 2 * relay_parent_state.n_validators {
tracing::warn!(
relay_parent_state.fetching.len = relay_parent_state.fetching.len(),
"other subsystems have requested PoV distribution to fetch more PoVs than reasonably expected",
);
}
// Issue an `Awaiting` message to all peers with this in their view.
notify_all_we_are_awaiting(
&mut state.peer_state,
ctx,
relay_parent,
descriptor.pov_hash
).await
}
/// Handles a `DistributePoV` message.
#[tracing::instrument(level = "trace", skip(ctx, state, pov), fields(subsystem = LOG_TARGET))]
async fn handle_distribute(
state: &mut State,
ctx: &mut impl SubsystemContext<Message = PoVDistributionMessage>,
relay_parent: Hash,
descriptor: CandidateDescriptor,
pov: Arc<PoV>,
let _timer = state.metrics.time_handle_distribute();
let relay_parent_state = match state.relay_parent_state.get_mut(&relay_parent) {
Some(s) => s,
};
if let Some(our_awaited) = relay_parent_state.fetching.get_mut(&descriptor.pov_hash) {
// Drain all the senders, but keep the entry in the map around intentionally.
//
// It signals that we were at one point awaiting this, so we will be able to tell
// why peers are sending it to us.
for response_sender in our_awaited.drain(..) {
let _ = response_sender.send(pov.clone());
}
}
relay_parent_state.known.insert(descriptor.pov_hash, pov.clone());
distribute_to_awaiting(
&mut state.peer_state,
ctx,
relay_parent,
descriptor.pov_hash,
&*pov,
).await
}
/// Report a reputation change for a peer.
#[tracing::instrument(level = "trace", skip(ctx), fields(subsystem = LOG_TARGET))]
async fn report_peer(
ctx: &mut impl SubsystemContext<Message = PoVDistributionMessage>,
peer: PeerId,
rep: Rep,
let _ = ctx.send_message(
AllMessages::NetworkBridge(NetworkBridgeMessage::ReportPeer(peer, rep))
).await;
}
/// Handle a notification from a peer that they are awaiting some PoVs.
#[tracing::instrument(level = "trace", skip(ctx, state), fields(subsystem = LOG_TARGET))]
async fn handle_awaiting(
state: &mut State,
ctx: &mut impl SubsystemContext<Message = PoVDistributionMessage>,
peer: PeerId,
relay_parent: Hash,
pov_hashes: Vec<Hash>,
if !state.our_view.contains(&relay_parent) {
report_peer(ctx, peer, COST_AWAITED_NOT_IN_VIEW).await;
return;
}
let relay_parent_state = match state.relay_parent_state.get_mut(&relay_parent) {
None => {
tracing::warn!("PoV Distribution relay parent state out-of-sync with our view");
}
Some(s) => s,
};
let peer_awaiting = match
state.peer_state.get_mut(&peer).and_then(|s| s.awaited.get_mut(&relay_parent))
{
None => {
report_peer(ctx, peer, COST_AWAITED_NOT_IN_VIEW).await;
return;
}
Some(a) => a,
};
let will_be_awaited = peer_awaiting.len() + pov_hashes.len();
if will_be_awaited <= 2 * relay_parent_state.n_validators {
for pov_hash in pov_hashes {
// For all requested PoV hashes, if we have it, we complete the request immediately.
// Otherwise, we note that the peer is awaiting the PoV.
if let Some(pov) = relay_parent_state.known.get(&pov_hash) {
let payload = send_pov_message(relay_parent, pov_hash, (&**pov).clone());
ctx.send_message(AllMessages::NetworkBridge(
NetworkBridgeMessage::SendValidationMessage(vec![peer.clone()], payload)
} else {
peer_awaiting.insert(pov_hash);
}
}
} else {
report_peer(ctx, peer, COST_APPARENT_FLOOD).await;
}
}
/// Handle an incoming PoV from our peer. Reports them if unexpected, rewards them if not.
///
/// Completes any requests awaiting that PoV.
#[tracing::instrument(level = "trace", skip(ctx, state, pov), fields(subsystem = LOG_TARGET))]
async fn handle_incoming_pov(
state: &mut State,
ctx: &mut impl SubsystemContext<Message = PoVDistributionMessage>,
peer: PeerId,
relay_parent: Hash,
pov_hash: Hash,
pov: PoV,
let relay_parent_state = match state.relay_parent_state.get_mut(&relay_parent) {
None => {
report_peer(ctx, peer, COST_UNEXPECTED_POV).await;
return;
},
Some(r) => r,
};
let pov = {
// Do validity checks and complete all senders awaiting this PoV.
let fetching = match relay_parent_state.fetching.get_mut(&pov_hash) {
None => {
report_peer(ctx, peer, COST_UNEXPECTED_POV).await;
return;
}
Some(f) => f,
};
let hash = pov.hash();
if hash != pov_hash {
report_peer(ctx, peer, COST_UNEXPECTED_POV).await;
return;
}
let pov = Arc::new(pov);
if fetching.is_empty() {
// fetching is empty whenever we were awaiting something and
// it was completed afterwards.
report_peer(ctx, peer.clone(), BENEFIT_LATE_POV).await;
} else {
// fetching is non-empty when the peer just provided us with data we needed.
report_peer(ctx, peer.clone(), BENEFIT_FRESH_POV).await;
}
for response_sender in fetching.drain(..) {
let _ = response_sender.send(pov.clone());
}
pov
};
// make sure we don't consider this peer as awaiting that PoV anymore.
if let Some(peer_state) = state.peer_state.get_mut(&peer) {
peer_state.awaited.remove(&pov_hash);
}
// distribute the PoV to all other peers who are awaiting it.
distribute_to_awaiting(
&mut state.peer_state,
ctx,
relay_parent,
pov_hash,
&*pov,
).await
}
/// Handles a newly connected validator in the context of some relay leaf.
fn handle_validator_connected(state: &mut State, peer_id: PeerId) {
state.peer_state.entry(peer_id).or_default();
}
/// Handles a network bridge update.
#[tracing::instrument(level = "trace", skip(ctx, state), fields(subsystem = LOG_TARGET))]
async fn handle_network_update(
state: &mut State,
ctx: &mut impl SubsystemContext<Message = PoVDistributionMessage>,
update: NetworkBridgeEvent<protocol_v1::PoVDistributionMessage>,
let _timer = state.metrics.time_handle_network_update();
match update {
NetworkBridgeEvent::PeerConnected(peer, _observed_role) => {
handle_validator_connected(state, peer);
}
NetworkBridgeEvent::PeerDisconnected(peer) => {
state.peer_state.remove(&peer);
}
NetworkBridgeEvent::PeerViewChange(peer_id, view) => {
if let Some(peer_state) = state.peer_state.get_mut(&peer_id) {
// prune anything not in the new view.
peer_state.awaited.retain(|relay_parent, _| view.contains(&relay_parent));
// introduce things from the new view.
for relay_parent in view.heads.iter() {
if let Entry::Vacant(entry) = peer_state.awaited.entry(*relay_parent) {
entry.insert(HashSet::new());
// Notify the peer about everything we're awaiting at the new relay-parent.
notify_one_we_are_awaiting_many(
&peer_id,
ctx,
&state.relay_parent_state,
*relay_parent,
NetworkBridgeEvent::PeerMessage(peer, message) => {
match message {
protocol_v1::PoVDistributionMessage::Awaiting(relay_parent, pov_hashes)
=> handle_awaiting(
state,
ctx,
peer,
relay_parent,
pov_hashes,
).await,
protocol_v1::PoVDistributionMessage::SendPoV(relay_parent, pov_hash, pov)
=> handle_incoming_pov(
state,
ctx,
peer,
relay_parent,
pov_hash,
pov,
).await,
}
}
NetworkBridgeEvent::OurViewChange(view) => {
state.our_view = view;
}
}
}
impl PoVDistribution {
/// Create a new instance of `PovDistribution`.
pub fn new(metrics: Metrics) -> Self {
Self { metrics }
}
#[tracing::instrument(skip(self, ctx), fields(subsystem = LOG_TARGET))]
async fn run(
self,
mut ctx: impl SubsystemContext<Message = PoVDistributionMessage>,
) -> SubsystemResult<()> {
let mut state = State::default();
state.metrics = self.metrics;
// `select_biased` is used since receiving connection notifications and
// peer view update messages may be racy and we want connection notifications
// first.
futures::select_biased! {
v = state.connection_requests.next().fuse() => handle_validator_connected(&mut state, v.peer_id),
v = ctx.recv().fuse() => {
match v? {
FromOverseer::Signal(signal) => if handle_signal(
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signal,
).await? {
return Ok(());
}
FromOverseer::Communication { msg } => match msg {
PoVDistributionMessage::FetchPoV(relay_parent, descriptor, response_sender) =>
handle_fetch(
&mut state,
&mut ctx,
relay_parent,
descriptor,
response_sender,
).await,
PoVDistributionMessage::DistributePoV(relay_parent, descriptor, pov) =>
handle_distribute(
&mut state,
&mut ctx,
relay_parent,
descriptor,
pov,
).await,
PoVDistributionMessage::NetworkBridgeUpdateV1(event) =>
handle_network_update(
&mut state,
&mut ctx,
event,
).await,
}
}
}
#[derive(Clone)]
struct MetricsInner {
povs_distributed: prometheus::Counter<prometheus::U64>,
handle_signal: prometheus::Histogram,
handle_fetch: prometheus::Histogram,
handle_distribute: prometheus::Histogram,
handle_network_update: prometheus::Histogram,
}
/// Availability Distribution metrics.
#[derive(Default, Clone)]
pub struct Metrics(Option<MetricsInner>);
impl Metrics {
fn on_pov_distributed(&self) {
if let Some(metrics) = &self.0 {
metrics.povs_distributed.inc();
}
}
/// Provide a timer for `handle_signal` which observes on drop.
fn time_handle_signal(&self) -> Option<metrics::prometheus::prometheus::HistogramTimer> {
self.0.as_ref().map(|metrics| metrics.handle_signal.start_timer())
}
/// Provide a timer for `handle_fetch` which observes on drop.
fn time_handle_fetch(&self) -> Option<metrics::prometheus::prometheus::HistogramTimer> {
self.0.as_ref().map(|metrics| metrics.handle_fetch.start_timer())
}
/// Provide a timer for `handle_distribute` which observes on drop.
fn time_handle_distribute(&self) -> Option<metrics::prometheus::prometheus::HistogramTimer> {
self.0.as_ref().map(|metrics| metrics.handle_distribute.start_timer())
}
/// Provide a timer for `handle_network_update` which observes on drop.
fn time_handle_network_update(&self) -> Option<metrics::prometheus::prometheus::HistogramTimer> {
self.0.as_ref().map(|metrics| metrics.handle_network_update.start_timer())
}
}
impl metrics::Metrics for Metrics {
fn try_register(registry: &prometheus::Registry) -> std::result::Result<Self, prometheus::PrometheusError> {
let metrics = MetricsInner {
povs_distributed: prometheus::register(
prometheus::Counter::new(
"parachain_povs_distributed_total",
"Number of PoVs distributed to other peers."
)?,
registry,
)?,
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
handle_signal: prometheus::register(
prometheus::Histogram::with_opts(
prometheus::HistogramOpts::new(
"parachain_pov_distribution_handle_signal",
"Time spent within `pov_distribution::handle_signal`",
)
)?,
registry,
)?,
handle_fetch: prometheus::register(
prometheus::Histogram::with_opts(
prometheus::HistogramOpts::new(
"parachain_pov_distribution_handle_fetch",
"Time spent within `pov_distribution::handle_fetch`",
)
)?,
registry,
)?,
handle_distribute: prometheus::register(
prometheus::Histogram::with_opts(
prometheus::HistogramOpts::new(
"parachain_pov_distribution_handle_distribute",
"Time spent within `pov_distribution::handle_distribute`",
)
)?,
registry,
)?,
handle_network_update: prometheus::register(
prometheus::Histogram::with_opts(
prometheus::HistogramOpts::new(
"parachain_pov_distribution_handle_network_update",
"Time spent within `pov_distribution::handle_network_update`",
)
)?,
registry,
)?,