Newer
Older
// Copyright 2019 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/>.
//! Gossip messages and the message validator
asynchronous rob
committed
use substrate_network::{config::Roles, PeerId};
use substrate_network::consensus_gossip::{
self as network_gossip, ValidationResult as GossipValidationResult,
asynchronous rob
committed
ValidatorContext, MessageIntent, ConsensusMessage,
asynchronous rob
committed
use polkadot_validation::{GenericStatement, SignedStatement};
use polkadot_primitives::{Block, Hash, SessionKey, parachain::ValidatorIndex};
asynchronous rob
committed
use std::collections::{HashMap, HashSet};
use std::sync::Arc;
use parking_lot::RwLock;
use crate::router::attestation_topic;
/// The engine ID of the polkadot attestation system.
pub const POLKADOT_ENGINE_ID: sr_primitives::ConsensusEngineId = [b'd', b'o', b't', b'1'];
asynchronous rob
committed
// arbitrary; in practice this should not be more than 2.
const MAX_CHAIN_HEADS: usize = 5;
mod benefit {
/// When a peer sends us a previously-unknown candidate statement.
pub const NEW_CANDIDATE: i32 = 100;
/// When a peer sends us a previously-unknown attestation.
pub const NEW_ATTESTATION: i32 = 50;
}
mod cost {
/// A peer sent us an attestation and we don't know the candidate.
pub const ATTESTATION_NO_CANDIDATE: i32 = -100;
/// A peer sent us a statement we consider in the future.
pub const FUTURE_MESSAGE: i32 = -100;
/// A peer sent us a statement from the past.
pub const PAST_MESSAGE: i32 = -30;
/// A peer sent us a malformed message.
pub const MALFORMED_MESSAGE: i32 = -500;
/// A peer sent us a wrongly signed message.
pub const BAD_SIGNATURE: i32 = -500;
/// A peer sent us a bad neighbor packet.
pub const BAD_NEIGHBOR_PACKET: i32 = -300;
}
/// A gossip message.
#[derive(Encode, Decode, Clone)]
asynchronous rob
committed
pub(crate) enum GossipMessage {
/// A packet sent to a neighbor but not relayed.
#[codec(index = "1")]
Neighbor(VersionedNeighborPacket),
/// An attestation-statement about the candidate.
/// Non-candidate statements should only be sent to peers who are aware of the candidate.
#[codec(index = "2")]
Statement(GossipStatement),
// TODO: https://github.com/paritytech/polkadot/issues/253
// erasure-coded chunks.
}
/// A gossip message containing a statement.
#[derive(Encode, Decode, Clone)]
pub(crate) struct GossipStatement {
/// The relay chain parent hash.
pub(crate) relay_parent: Hash,
/// The signed statement being gossipped.
asynchronous rob
committed
pub(crate) signed_statement: SignedStatement,
}
/// A versioned neighbor message.
#[derive(Encode, Decode, Clone)]
pub enum VersionedNeighborPacket {
#[codec(index = "1")]
V1(NeighborPacket),
}
/// Contains information on which chain heads the peer is
/// accepting messages for.
#[derive(Encode, Decode, Clone)]
pub struct NeighborPacket {
chain_heads: Vec<Hash>,
}
/// whether a block is known.
asynchronous rob
committed
#[derive(Clone, Copy)]
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
pub enum Known {
/// The block is a known leaf.
Leaf,
/// The block is known to be old.
Old,
/// The block is known to be bad.
Bad,
}
/// An oracle for known blocks.
pub trait KnownOracle: Send + Sync {
/// whether a block is known. If it's not, returns `None`.
fn is_known(&self, block_hash: &Hash) -> Option<Known>;
}
impl<F> KnownOracle for F where F: Fn(&Hash) -> Option<Known> + Send + Sync {
fn is_known(&self, block_hash: &Hash) -> Option<Known> {
(self)(block_hash)
}
}
/// Register a gossip validator on the network service.
///
/// This returns a `RegisteredMessageValidator`
// NOTE: since RegisteredMessageValidator is meant to be a type-safe proof
// that we've actually done the registration, this should be the only way
// to construct it outside of tests.
pub fn register_validator<O: KnownOracle + 'static>(
asynchronous rob
committed
service: Arc<NetworkService>,
oracle: O,
) -> RegisteredMessageValidator {
asynchronous rob
committed
let s = service.clone();
let report_handle = Box::new(move |peer: &PeerId, cost_benefit| {
s.report_peer(peer.clone(), cost_benefit);
});
let validator = Arc::new(MessageValidator {
asynchronous rob
committed
report_handle,
inner: RwLock::new(Inner {
peers: HashMap::new(),
our_view: Default::default(),
oracle,
})
});
let gossip_side = validator.clone();
service.with_gossip(|gossip, ctx|
gossip.register_validator(ctx, POLKADOT_ENGINE_ID, gossip_side)
);
RegisteredMessageValidator { inner: validator as _ }
}
/// A registered message validator.
///
/// Create this using `register_validator`.
#[derive(Clone)]
pub struct RegisteredMessageValidator {
inner: Arc<MessageValidator<dyn KnownOracle>>,
}
impl RegisteredMessageValidator {
#[cfg(test)]
asynchronous rob
committed
pub(crate) fn new_test<O: KnownOracle + 'static>(
oracle: O,
report_handle: Box<dyn Fn(&PeerId, i32) + Send + Sync>,
asynchronous rob
committed
) -> Self {
let validator = Arc::new(MessageValidator::new_test(oracle, report_handle));
RegisteredMessageValidator { inner: validator as _ }
}
/// Note a live attestation session. This must be removed later with
/// `remove_session`.
asynchronous rob
committed
pub(crate) fn note_session<F: FnMut(&PeerId, ConsensusMessage)>(
&self,
relay_parent: Hash,
validation: MessageValidationData,
send_neighbor_packet: F,
) {
// add an entry in our_view
// prune any entries from our_view which are no longer leaves
let mut inner = self.inner.inner.write();
inner.our_view.add_session(relay_parent, validation);
{
let &mut Inner { ref oracle, ref mut our_view, .. } = &mut *inner;
our_view.prune_old_sessions(|parent| match oracle.is_known(parent) {
Some(Known::Leaf) => true,
_ => false,
});
}
asynchronous rob
committed
// send neighbor packets to peers
inner.multicast_neighbor_packet(send_neighbor_packet);
/// The data needed for validating gossip.
asynchronous rob
committed
#[derive(Default)]
pub(crate) struct MessageValidationData {
/// The authorities at a block.
pub(crate) authorities: Vec<SessionKey>,
/// Mapping from validator index to `SessionKey`.
pub(crate) index_mapping: HashMap<ValidatorIndex, SessionKey>,
}
impl MessageValidationData {
asynchronous rob
committed
fn check_statement(&self, relay_parent: &Hash, statement: &SignedStatement) -> Result<(), ()> {
let sender = match self.index_mapping.get(&statement.sender) {
Some(val) => val,
asynchronous rob
committed
None => return Err(()),
asynchronous rob
committed
let good = self.authorities.contains(&sender) &&
::polkadot_validation::check_statement(
&statement.statement,
&statement.signature,
sender.clone(),
asynchronous rob
committed
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
);
if good {
Ok(())
} else {
Err(())
}
}
}
// knowledge about attestations on a single parent-hash.
#[derive(Default)]
struct Knowledge {
candidates: HashSet<Hash>,
}
impl Knowledge {
// whether the peer is aware of a candidate with given hash.
fn is_aware_of(&self, candidate_hash: &Hash) -> bool {
self.candidates.contains(candidate_hash)
}
// note that the peer is aware of a candidate with given hash.
fn note_aware(&mut self, candidate_hash: Hash) {
self.candidates.insert(candidate_hash);
}
}
struct PeerData {
live: HashMap<Hash, Knowledge>,
}
impl PeerData {
fn knowledge_at_mut(&mut self, parent_hash: &Hash) -> Option<&mut Knowledge> {
self.live.get_mut(parent_hash)
}
}
struct OurView {
live_sessions: Vec<(Hash, SessionView)>,
topics: HashMap<Hash, Hash>, // maps topic hashes to block hashes.
}
impl Default for OurView {
fn default() -> Self {
OurView {
live_sessions: Vec::with_capacity(MAX_CHAIN_HEADS),
topics: Default::default(),
}
}
}
impl OurView {
fn session_view(&self, relay_parent: &Hash) -> Option<&SessionView> {
self.live_sessions.iter()
.find_map(|&(ref h, ref sesh)| if h == relay_parent { Some(sesh) } else { None } )
}
fn session_view_mut(&mut self, relay_parent: &Hash) -> Option<&mut SessionView> {
self.live_sessions.iter_mut()
.find_map(|&mut (ref h, ref mut sesh)| if h == relay_parent { Some(sesh) } else { None } )
}
fn add_session(&mut self, relay_parent: Hash, validation_data: MessageValidationData) {
self.live_sessions.push((
relay_parent,
SessionView {
validation_data,
knowledge: Default::default(),
},
));
self.topics.insert(attestation_topic(relay_parent), relay_parent);
}
fn prune_old_sessions<F: Fn(&Hash) -> bool>(&mut self, is_leaf: F) {
let live_sessions = &mut self.live_sessions;
live_sessions.retain(|&(ref relay_parent, _)| is_leaf(relay_parent));
self.topics.retain(|_, v| live_sessions.iter().find(|(p, _)| p == v).is_some());
}
fn knows_topic(&self, topic: &Hash) -> bool {
self.topics.contains_key(topic)
}
fn topic_block(&self, topic: &Hash) -> Option<&Hash> {
self.topics.get(topic)
}
fn neighbor_info(&self) -> Vec<Hash> {
self.live_sessions.iter().take(MAX_CHAIN_HEADS).map(|(p, _)| p.clone()).collect()
}
}
struct SessionView {
validation_data: MessageValidationData,
knowledge: Knowledge,
}
struct Inner<O: ?Sized> {
peers: HashMap<PeerId, PeerData>,
our_view: OurView,
oracle: O,
}
impl<O: ?Sized + KnownOracle> Inner<O> {
fn validate_statement(&mut self, message: GossipStatement)
-> (GossipValidationResult<Hash>, i32)
{
// message must reference one of our chain heads and one
// if message is not a `Candidate` we should have the candidate available
// in `our_view`.
match self.our_view.session_view(&message.relay_parent) {
None => {
let cost = match self.oracle.is_known(&message.relay_parent) {
Some(Known::Leaf) => {
warn!(
target: "network",
"Leaf block {} not considered live for attestation",
message.relay_parent,
);
0
}
Some(Known::Old) => cost::PAST_MESSAGE,
_ => cost::FUTURE_MESSAGE,
};
(GossipValidationResult::Discard, cost)
}
Some(view) => {
// first check that we are capable of receiving this message
// in a DoS-proof manner.
let benefit = match message.signed_statement.statement {
GenericStatement::Candidate(_) => benefit::NEW_CANDIDATE,
GenericStatement::Valid(ref h) | GenericStatement::Invalid(ref h) => {
if !view.knowledge.is_aware_of(h) {
let cost = cost::ATTESTATION_NO_CANDIDATE;
return (GossipValidationResult::Discard, cost);
}
benefit::NEW_ATTESTATION
}
};
// validate signature.
let res = view.validation_data.check_statement(
&message.relay_parent,
&message.signed_statement,
);
match res {
Ok(()) => {
let topic = attestation_topic(message.relay_parent);
(GossipValidationResult::ProcessAndKeep(topic), benefit)
}
Err(()) => (GossipValidationResult::Discard, cost::BAD_SIGNATURE),
}
}
}
}
fn validate_neighbor_packet(&mut self, sender: &PeerId, packet: NeighborPacket)
-> (GossipValidationResult<Hash>, i32, Vec<Hash>)
{
let chain_heads = packet.chain_heads;
if chain_heads.len() > MAX_CHAIN_HEADS {
(GossipValidationResult::Discard, cost::BAD_NEIGHBOR_PACKET, Vec::new())
} else {
let mut new_topics = Vec::new();
if let Some(ref mut peer) = self.peers.get_mut(sender) {
peer.live.retain(|k, _| chain_heads.contains(k));
for head in chain_heads {
peer.live.entry(head).or_insert_with(|| {
new_topics.push(attestation_topic(head));
Default::default()
});
}
}
(GossipValidationResult::Discard, 0, new_topics)
}
}
fn multicast_neighbor_packet<F: FnMut(&PeerId, ConsensusMessage)>(
&self,
mut send_neighbor_packet: F,
) {
let neighbor_packet = GossipMessage::Neighbor(VersionedNeighborPacket::V1(NeighborPacket {
chain_heads: self.our_view.neighbor_info()
}));
let message = ConsensusMessage {
data: neighbor_packet.encode(),
engine_id: POLKADOT_ENGINE_ID,
};
for peer in self.peers.keys() {
send_neighbor_packet(peer, message.clone())
}
}
}
/// An unregistered message validator. Register this with `register_validator`.
pub struct MessageValidator<O: ?Sized> {
report_handle: Box<dyn Fn(&PeerId, i32) + Send + Sync>,
asynchronous rob
committed
inner: RwLock<Inner<O>>,
}
impl<O: KnownOracle + ?Sized> MessageValidator<O> {
#[cfg(test)]
fn new_test(
oracle: O,
report_handle: Box<dyn Fn(&PeerId, i32) + Send + Sync>,
asynchronous rob
committed
) -> Self where O: Sized{
MessageValidator {
report_handle,
inner: RwLock::new(Inner {
peers: HashMap::new(),
our_view: Default::default(),
oracle,
})
}
}
fn report(&self, who: &PeerId, cost_benefit: i32) {
(self.report_handle)(who, cost_benefit)
}
impl<O: KnownOracle + ?Sized> network_gossip::Validator<Block> for MessageValidator<O> {
fn new_peer(&self, _context: &mut dyn ValidatorContext<Block>, who: &PeerId, _roles: Roles) {
asynchronous rob
committed
let mut inner = self.inner.write();
inner.peers.insert(who.clone(), PeerData {
live: HashMap::new(),
});
}
fn peer_disconnected(&self, _context: &mut dyn ValidatorContext<Block>, who: &PeerId) {
asynchronous rob
committed
let mut inner = self.inner.write();
inner.peers.remove(who);
}
fn validate(&self, context: &mut dyn ValidatorContext<Block>, sender: &PeerId, mut data: &[u8])
-> GossipValidationResult<Hash>
{
asynchronous rob
committed
let (res, cost_benefit) = match GossipMessage::decode(&mut data) {
None => (GossipValidationResult::Discard, cost::MALFORMED_MESSAGE),
Some(GossipMessage::Neighbor(VersionedNeighborPacket::V1(packet))) => {
let (res, cb, topics) = self.inner.write().validate_neighbor_packet(sender, packet);
for new_topic in topics {
context.send_topic(sender, new_topic, false);
}
(res, cb)
}
Some(GossipMessage::Statement(statement)) => {
let (res, cb) = self.inner.write().validate_statement(statement);
if let GossipValidationResult::ProcessAndKeep(ref topic) = res {
context.broadcast_message(topic.clone(), data.to_vec(), false);
}
(res, cb)
}
};
self.report(sender, cost_benefit);
res
}
fn message_expired<'a>(&'a self) -> Box<dyn FnMut(Hash, &[u8]) -> bool + 'a> {
asynchronous rob
committed
let inner = self.inner.read();
Box::new(move |topic, _data| {
// check that topic is one of our live sessions. everything else is expired
!inner.our_view.knows_topic(&topic)
})
}
fn message_allowed<'a>(&'a self) -> Box<dyn FnMut(&PeerId, MessageIntent, &Hash, &[u8]) -> bool + 'a> {
asynchronous rob
committed
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
let mut inner = self.inner.write();
Box::new(move |who, intent, topic, data| {
let &mut Inner { ref mut peers, ref mut our_view, .. } = &mut *inner;
match intent {
MessageIntent::PeriodicRebroadcast => return false,
_ => {},
}
let relay_parent = match our_view.topic_block(topic) {
None => return false,
Some(hash) => hash.clone(),
};
// check that topic is one of our peers' live sessions.
let peer_knowledge = match peers.get_mut(who)
.and_then(|p| p.knowledge_at_mut(&relay_parent))
{
Some(p) => p,
None => return false,
};
match GossipMessage::decode(&mut &data[..]) {
Some(GossipMessage::Statement(statement)) => {
let signed = statement.signed_statement;
match signed.statement {
GenericStatement::Valid(ref h) | GenericStatement::Invalid(ref h) => {
// `valid` and `invalid` statements can only be propagated after
// a candidate message is known by that peer.
if !peer_knowledge.is_aware_of(h) {
return false;
}
}
GenericStatement::Candidate(ref c) => {
// if we are sending a `Candidate` message we should make sure that
// our_view and their_view reflects that we know about the candidate.
let hash = c.hash();
peer_knowledge.note_aware(hash);
if let Some(our_view) = our_view.session_view_mut(&relay_parent) {
our_view.knowledge.note_aware(hash);
}
}
asynchronous rob
committed
_ => return false,
asynchronous rob
committed
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
true
})
}
}
#[cfg(test)]
mod tests {
use super::*;
use substrate_network::consensus_gossip::Validator as ValidatorT;
use std::sync::mpsc;
use parking_lot::Mutex;
use polkadot_primitives::parachain::{CandidateReceipt, HeadData};
use substrate_primitives::crypto::UncheckedInto;
use substrate_primitives::ed25519::Signature as Ed25519Signature;
#[derive(PartialEq, Clone, Debug)]
enum ContextEvent {
BroadcastTopic(Hash, bool),
BroadcastMessage(Hash, Vec<u8>, bool),
SendMessage(PeerId, Vec<u8>),
SendTopic(PeerId, Hash, bool),
}
#[derive(Default)]
struct MockValidatorContext {
events: Vec<ContextEvent>,
}
impl MockValidatorContext {
fn clear(&mut self) {
self.events.clear()
}
}
impl network_gossip::ValidatorContext<Block> for MockValidatorContext {
fn broadcast_topic(&mut self, topic: Hash, force: bool) {
self.events.push(ContextEvent::BroadcastTopic(topic, force));
}
fn broadcast_message(&mut self, topic: Hash, message: Vec<u8>, force: bool) {
self.events.push(ContextEvent::BroadcastMessage(topic, message, force));
}
fn send_message(&mut self, who: &PeerId, message: Vec<u8>) {
self.events.push(ContextEvent::SendMessage(who.clone(), message));
}
fn send_topic(&mut self, who: &PeerId, topic: Hash, force: bool) {
self.events.push(ContextEvent::SendTopic(who.clone(), topic, force));
}
}
#[test]
fn message_allowed() {
let (tx, _rx) = mpsc::channel();
let tx = Mutex::new(tx);
let known_map = HashMap::<Hash, Known>::new();
let report_handle = Box::new(move |peer: &PeerId, cb: i32| tx.lock().send((peer.clone(), cb)).unwrap());
let validator = MessageValidator::new_test(
move |hash: &Hash| known_map.get(hash).map(|x| x.clone()),
report_handle,
);
let peer_a = PeerId::random();
let mut validator_context = MockValidatorContext::default();
validator.new_peer(&mut validator_context, &peer_a, Roles::FULL);
assert!(validator_context.events.is_empty());
validator_context.clear();
let hash_a = [1u8; 32].into();
let hash_b = [2u8; 32].into();
let hash_c = [3u8; 32].into();
let message = GossipMessage::Neighbor(VersionedNeighborPacket::V1(NeighborPacket {
chain_heads: vec![hash_a, hash_b],
})).encode();
let res = validator.validate(
&mut validator_context,
&peer_a,
&message[..],
);
match res {
GossipValidationResult::Discard => {},
_ => panic!("wrong result"),
}
assert_eq!(
validator_context.events,
vec![
ContextEvent::SendTopic(peer_a.clone(), attestation_topic(hash_a), false),
ContextEvent::SendTopic(peer_a.clone(), attestation_topic(hash_b), false),
],
);
validator_context.clear();
let candidate_receipt = CandidateReceipt {
parachain_index: 5.into(),
collator: [255; 32].unchecked_into(),
head_data: HeadData(vec![9, 9, 9]),
signature: Default::default(),
egress_queue_roots: Vec::new(),
fees: 1_000_000,
block_data_hash: [20u8; 32].into(),
asynchronous rob
committed
};
let statement = GossipMessage::Statement(GossipStatement {
relay_parent: hash_a,
signed_statement: SignedStatement {
statement: GenericStatement::Candidate(candidate_receipt),
signature: Ed25519Signature([255u8; 64]),
sender: 1,
asynchronous rob
committed
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
});
let encoded = statement.encode();
let topic_a = attestation_topic(hash_a);
let topic_b = attestation_topic(hash_b);
let topic_c = attestation_topic(hash_c);
// topic_a is in all 3 views -> succeed
validator.inner.write().our_view.add_session(hash_a, MessageValidationData::default());
// topic_b is in the neighbor's view but not ours -> fail
// topic_c is not in either -> fail
{
let mut message_allowed = validator.message_allowed();
assert!(message_allowed(&peer_a, MessageIntent::Broadcast, &topic_a, &encoded));
assert!(!message_allowed(&peer_a, MessageIntent::Broadcast, &topic_b, &encoded));
assert!(!message_allowed(&peer_a, MessageIntent::Broadcast, &topic_c, &encoded));
}
}
#[test]
fn too_many_chain_heads_is_report() {
let (tx, rx) = mpsc::channel();
let tx = Mutex::new(tx);
let known_map = HashMap::<Hash, Known>::new();
let report_handle = Box::new(move |peer: &PeerId, cb: i32| tx.lock().send((peer.clone(), cb)).unwrap());
let validator = MessageValidator::new_test(
move |hash: &Hash| known_map.get(hash).map(|x| x.clone()),
report_handle,
);
let peer_a = PeerId::random();
let mut validator_context = MockValidatorContext::default();
validator.new_peer(&mut validator_context, &peer_a, Roles::FULL);
assert!(validator_context.events.is_empty());
validator_context.clear();
let chain_heads = (0..MAX_CHAIN_HEADS+1).map(|i| [i as u8; 32].into()).collect();
let message = GossipMessage::Neighbor(VersionedNeighborPacket::V1(NeighborPacket {
chain_heads,
})).encode();
let res = validator.validate(
&mut validator_context,
&peer_a,
&message[..],
);
match res {
GossipValidationResult::Discard => {},
_ => panic!("wrong result"),
}
assert_eq!(
validator_context.events,
Vec::new(),
);
drop(validator);
assert_eq!(rx.iter().collect::<Vec<_>>(), vec![(peer_a, cost::BAD_NEIGHBOR_PACKET)]);
}
#[test]
fn statement_only_sent_when_candidate_known() {
let (tx, _rx) = mpsc::channel();
let tx = Mutex::new(tx);
let known_map = HashMap::<Hash, Known>::new();
let report_handle = Box::new(move |peer: &PeerId, cb: i32| tx.lock().send((peer.clone(), cb)).unwrap());
let validator = MessageValidator::new_test(
move |hash: &Hash| known_map.get(hash).map(|x| x.clone()),
report_handle,
);
let peer_a = PeerId::random();
let mut validator_context = MockValidatorContext::default();
validator.new_peer(&mut validator_context, &peer_a, Roles::FULL);
assert!(validator_context.events.is_empty());
validator_context.clear();
let hash_a = [1u8; 32].into();
let hash_b = [2u8; 32].into();
let message = GossipMessage::Neighbor(VersionedNeighborPacket::V1(NeighborPacket {
chain_heads: vec![hash_a, hash_b],
})).encode();
let res = validator.validate(
&mut validator_context,
&peer_a,
&message[..],
);
match res {
GossipValidationResult::Discard => {},
_ => panic!("wrong result"),
}
assert_eq!(
validator_context.events,
vec![
ContextEvent::SendTopic(peer_a.clone(), attestation_topic(hash_a), false),
ContextEvent::SendTopic(peer_a.clone(), attestation_topic(hash_b), false),
],
);
validator_context.clear();
let topic_a = attestation_topic(hash_a);
let c_hash = [99u8; 32].into();
let statement = GossipMessage::Statement(GossipStatement {
relay_parent: hash_a,
signed_statement: SignedStatement {
statement: GenericStatement::Valid(c_hash),
signature: Ed25519Signature([255u8; 64]),
sender: 1,
}
});
let encoded = statement.encode();
validator.inner.write().our_view.add_session(hash_a, MessageValidationData::default());
{
let mut message_allowed = validator.message_allowed();
assert!(!message_allowed(&peer_a, MessageIntent::Broadcast, &topic_a, &encoded[..]));
}
validator
.inner
.write()
.peers
.get_mut(&peer_a)
.unwrap()
.live
.get_mut(&hash_a)
.unwrap()
.note_aware(c_hash);
{
let mut message_allowed = validator.message_allowed();
assert!(message_allowed(&peer_a, MessageIntent::Broadcast, &topic_a, &encoded[..]));