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impl Behaviour {
fn handle_kademlia_event(&mut self, ev: kad::Event) -> (bool, Option<Event>) {
match ev {
kad::Event::InboundRequest { request } => {
match request {
kad::InboundRequest::AddProvider { record } => {
let record =
record.expect("filtering is enabled, so the record should be present");
if self.validate_provider_registration(&record) {
// Accept the provider registration
#[cfg_attr(not(feature = "tracing"), allow(unused_variables))]
if let Err(err) = self.kademlia.store_mut().add_provider(record) {
#[cfg(feature = "tracing")]
tracing::warn!("failed to store provider: {err}");
}
}
(false, None)
}
kad::InboundRequest::PutRecord { source, record, .. } => {
let record =
record.expect("filtering is enabled, so the record should be present");
if self.validate_metadata_record(&source, &record) {
// Store the metadata record
#[cfg_attr(not(feature = "tracing"), allow(unused_variables))]
if let Err(err) = self.kademlia.store_mut().put(record) {
#[cfg(feature = "tracing")]
tracing::warn!("failed to store metadata record: {err}");
}
}
(false, None)
}
_ => (false, None),
}
}
kad::Event::OutboundQueryProgressed {
id,
result,
stats: _,
step,
} => match result {
#[cfg_attr(not(feature = "tracing"), allow(unused_variables))]
kad::QueryResult::Bootstrap(res) => {
#[cfg(feature = "tracing")]
if let Err(err) = res {
tracing::warn!("bootstrap failed: {err}");
}
let failed_peers = self
.pending_peers
.extract_if(|_, failed_at| failed_at.elapsed() > Duration::from_secs(5));
for ((peer_id, addr), _) in failed_peers {
#[cfg(feature = "tracing")]
tracing::debug!(%peer_id, %addr, "removing address for peer");
self.kademlia.remove_address(&peer_id, &addr);
}
(false, None)
}
kad::QueryResult::GetClosestPeers(_) => (false, None),
// Getting the providers has progressed
kad::QueryResult::GetProviders(res) => {
let Entry::Occupied(mut lookup_query_entry) = self.lookup_queries.entry(id)
else {
#[cfg(feature = "tracing")]
tracing::warn!("ignoring GetProviders event for unknown lookup query");
return (false, None);
};
let lookup_query = lookup_query_entry.get_mut();
match res {
Ok(kad::GetProvidersOk::FoundProviders { providers, .. }) => {
let mut wake = false;
lookup_query.providers_finished = step.last;
for provider in providers {
wake |=
lookup_query.get_metadata_record(&mut self.kademlia, &provider);
}
let last = step.last && lookup_query.is_finished();
if last {
if lookup_query.reply.is_none() {
self.pending_events.push_back(Event::LookupCompleted {
provider_query_id: id,
});
}
lookup_query_entry.remove();
}
(wake, None)
}
Ok(kad::GetProvidersOk::FinishedWithNoAdditionalRecord { .. }) => {
lookup_query.providers_finished = step.last;
let last = step.last && lookup_query.is_finished();
if last {
if lookup_query.reply.is_none() {
self.pending_events.push_back(Event::LookupCompleted {
provider_query_id: id,
});
}
lookup_query_entry.remove();
}
(false, None)
}
Err(kad::GetProvidersError::Timeout { .. }) => {
lookup_query.providers_finished = step.last;
let last = step.last && lookup_query.is_finished();
match &lookup_query.reply {
Some(tx) => {
let _ = tx.send(Err(RegistryError::Timeout));
}
None => {
self.pending_events.push_back(Event::LookupTimeout {
provider_query_id: id,
});
}
}
if last {
if lookup_query.reply.is_none() {
self.pending_events.push_back(Event::LookupCompleted {
provider_query_id: id,
});
}
lookup_query_entry.remove();
}
(false, None)
}
}
}
// Registering an actor has progressed
kad::QueryResult::StartProviding(res) => {
let Entry::Occupied(mut registration_query_entry) =
self.registration_queries.entry(id)
else {
#[cfg(feature = "tracing")]
tracing::warn!(
"ignoring StartProviding event for unknown registration query"
);
return (false, None);
};
let registration_query = registration_query_entry.get_mut();
match res {
Ok(kad::AddProviderOk { .. }) => {
let Some(registration) = registration_query.registration.take() else {
panic!("the registration should exist here");
};
registration_query.provider_result = Some(res.clone());
// Store the metadata record
let key =
format!("{}:meta:{}", registration_query.name, self.local_peer_id);
let registration_bytes = registration.into_bytes();
let record = kad::Record::new(key.into_bytes(), registration_bytes);
match self.kademlia.put_record(record, kad::Quorum::One) {
Ok(put_query_id) => {
registration_query.put_query_id = Some(put_query_id);
}
Err(err) => {
// Put record failed immediately
match registration_query_entry.remove().reply {
Some(tx) => {
let _ = tx.send(Err(err.into()));
}
None => {
self.pending_events.push_back(
Event::RegistrationFailed {
provider_query_id: id,
error: err.into(),
},
);
}
}
}
}
(true, None)
}
Err(kad::AddProviderError::Timeout { .. }) => {
match registration_query_entry.remove().reply {
Some(tx) => {
let _ = tx.send(Err(RegistryError::Timeout));
}
None => {
self.pending_events.push_back(Event::RegistrationFailed {
provider_query_id: id,
error: RegistryError::Timeout,
});
}
}
(false, None)
}
}
}
kad::QueryResult::RepublishProvider(_) => (false, None),
// Getting a metadata record has progressed
kad::QueryResult::GetRecord(res) => {
let Some((provider_query_id, lookup_query)) = self
.lookup_queries
.iter_mut()
.find(|(_, lookup_query)| lookup_query.has_metadata_query(&id))
else {
#[cfg(feature = "tracing")]
tracing::warn!("ignoring GetRecord event for unknown lookup query");
return (false, None);
};
let provider_query_id = *provider_query_id;
match res {
Ok(kad::GetRecordOk::FoundRecord(kad::PeerRecord {
record: kad::Record { value, .. },
..
})) => {
let result = ActorRegistration::from_bytes(&value)
.map(|registration| registration.into_owned())
.map_err(RegistryError::from);
// Check if we've already reported this provider to avoid duplicates
let should_emit = if let Ok(ref registration) = result {
if let Some(peer_id) = registration.actor_id.peer_id() {
if lookup_query.reported_providers.contains(&peer_id) {
false // Already reported this provider
} else {
lookup_query.reported_providers.insert(peer_id);
true
}
} else {
true // No peer_id, emit anyway
}
} else {
true // Error case, emit anyway
};
if should_emit {
match &lookup_query.reply {
Some(tx) => {
let _ = tx.send(result);
}
None => {
self.pending_events.push_back(Event::LookupProgressed {
provider_query_id,
get_query_id: id,
result,
});
}
}
}
}
// These cases don't provide useful information to the user
Ok(kad::GetRecordOk::FinishedWithNoAdditionalRecord { .. })
| Err(kad::GetRecordError::NotFound { .. }) => {
// No progress event needed
}
// Error cases are still useful to report
Err(kad::GetRecordError::QuorumFailed { quorum, .. }) => {
match &lookup_query.reply {
Some(tx) => {
let _ = tx.send(Err(RegistryError::QuorumFailed { quorum }));
}
None => {
self.pending_events.push_back(Event::LookupProgressed {
provider_query_id,
get_query_id: id,
result: Err(RegistryError::QuorumFailed { quorum }),
});
}
}
}
Err(kad::GetRecordError::Timeout { .. }) => match &lookup_query.reply {
Some(tx) => {
let _ = tx.send(Err(RegistryError::Timeout));
}
None => {
self.pending_events.push_back(Event::LookupProgressed {
provider_query_id,
get_query_id: id,
result: Err(RegistryError::Timeout),
});
}
},
}
if step.last {
lookup_query.metadata_query_finished(&id);
let last = lookup_query.is_finished();
if last {
if lookup_query.reply.is_none() {
self.pending_events
.push_back(Event::LookupCompleted { provider_query_id });
}
self.lookup_queries.remove(&provider_query_id);
}
}
(false, None)
}
// Putting a metadata record has progressed
kad::QueryResult::PutRecord(res) => {
let Some(provider_query_id) =
self.registration_queries
.iter()
.find_map(|(query_id, reg)| {
if reg.put_query_id == Some(id) {
Some(*query_id)
} else {
None
}
})
else {
#[cfg(feature = "tracing")]
tracing::warn!("ignoring PutRecord event for unknown registration query");
return (false, None);
};
match res {
Ok(ok) => {
let mut registration_query = self
.registration_queries
.remove(&provider_query_id)
.unwrap();
match registration_query.reply.take() {
Some(tx) => {
let _ = tx.send(Ok(()));
}
None => {
self.pending_events.push_back(Event::RegisteredActor {
provider_result: registration_query
.provider_result
.unwrap(),
provider_query_id,
metadata_result: Ok(ok.clone()),
metadata_query_id: id,
});
}
}
}
Err(err) => {
match self
.registration_queries
.remove(&provider_query_id)
.and_then(|q| q.reply)
{
Some(tx) => {
let _ = tx.send(Err(err.clone().into()));
}
None => {
self.pending_events.push_back(Event::RegistrationFailed {
provider_query_id,
error: err.clone().into(),
});
}
}
}
}
(false, None)
}
kad::QueryResult::RepublishRecord(_) => (false, None),
},
kad::Event::RoutingUpdated {
peer,
is_new_peer,
addresses,
bucket_range,
old_peer,
} => (
false,
Some(Event::RoutingUpdated {
peer,
is_new_peer,
addresses,
bucket_range,
old_peer,
}),
),
kad::Event::UnroutablePeer { peer } => (false, Some(Event::UnroutablePeer { peer })),
kad::Event::RoutablePeer { peer, address } => {
(false, Some(Event::RoutablePeer { peer, address }))
}
kad::Event::PendingRoutablePeer { peer, address } => {
(false, Some(Event::PendingRoutablePeer { peer, address }))
}
kad::Event::ModeChanged { .. } => (false, None),
}
}
}