_ Git - rust-lightning/blob - fuzz/src/chanmon_consistency.rs

   1 // This file is Copyright its original authors, visible in version control
   2 // history.
   3 //
   4 // This file is licensed under the Apache License, Version 2.0 <LICENSE-APACHE
   5 // or http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   6 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your option.
   7 // You may not use this file except in accordance with one or both of these
   8 // licenses.
   9
  10 //! Test that monitor update failures don't get our channel state out of sync.
  11 //! One of the biggest concern with the monitor update failure handling code is that messages
  12 //! resent after monitor updating is restored are delivered out-of-order, resulting in
  13 //! commitment_signed messages having "invalid signatures".
  14 //! To test this we stand up a network of three nodes and read bytes from the fuzz input to denote
  15 //! actions such as sending payments, handling events, or changing monitor update return values on
  16 //! a per-node basis. This should allow it to find any cases where the ordering of actions results
  17 //! in us getting out of sync with ourselves, and, assuming at least one of our recieve- or
  18 //! send-side handling is correct, other peers. We consider it a failure if any action results in a
  19 //! channel being force-closed.
  20
  21 use bitcoin::TxMerkleNode;
  22 use bitcoin::blockdata::block::BlockHeader;
  23 use bitcoin::blockdata::constants::genesis_block;
  24 use bitcoin::blockdata::transaction::{Transaction, TxOut};
  25 use bitcoin::blockdata::script::{Builder, Script};
  26 use bitcoin::blockdata::opcodes;
  27 use bitcoin::blockdata::locktime::PackedLockTime;
  28 use bitcoin::network::constants::Network;
  29
  30 use bitcoin::hashes::Hash as TraitImport;
  31 use bitcoin::hashes::sha256::Hash as Sha256;
  32 use bitcoin::hash_types::{BlockHash, WPubkeyHash};
  33
  34 use lightning::chain;
  35 use lightning::chain::{BestBlock, ChannelMonitorUpdateStatus, chainmonitor, channelmonitor, Confirm, Watch};
  36 use lightning::chain::channelmonitor::{ChannelMonitor, MonitorEvent};
  37 use lightning::chain::transaction::OutPoint;
  38 use lightning::chain::chaininterface::{BroadcasterInterface, ConfirmationTarget, FeeEstimator};
  39 use lightning::chain::keysinterface::{KeyMaterial, KeysInterface, InMemorySigner, Recipient, EntropySource, NodeSigner, SignerProvider};
  40 use lightning::ln::{PaymentHash, PaymentPreimage, PaymentSecret};
  41 use lightning::ln::channelmanager::{self, ChainParameters, ChannelManager, PaymentSendFailure, ChannelManagerReadArgs, PaymentId};
  42 use lightning::ln::channel::FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE;
  43 use lightning::ln::msgs::{CommitmentUpdate, ChannelMessageHandler, DecodeError, UpdateAddHTLC, Init};
  44 use lightning::ln::script::ShutdownScript;
  45 use lightning::util::enforcing_trait_impls::{EnforcingSigner, EnforcementState};
  46 use lightning::util::errors::APIError;
  47 use lightning::util::events;
  48 use lightning::util::logger::Logger;
  49 use lightning::util::config::UserConfig;
  50 use lightning::util::events::MessageSendEventsProvider;
  51 use lightning::util::ser::{Readable, ReadableArgs, Writeable, Writer};
  52 use lightning::routing::router::{Route, RouteHop};
  53
  54 use crate::utils::test_logger::{self, Output};
  55 use crate::utils::test_persister::TestPersister;
  56
  57 use bitcoin::secp256k1::{PublicKey, SecretKey, Scalar};
  58 use bitcoin::secp256k1::ecdh::SharedSecret;
  59 use bitcoin::secp256k1::ecdsa::RecoverableSignature;
  60 use bitcoin::secp256k1::Secp256k1;
  61
  62 use std::mem;
  63 use std::cmp::{self, Ordering};
  64 use std::collections::{HashSet, hash_map, HashMap};
  65 use std::sync::{Arc,Mutex};
  66 use std::sync::atomic;
  67 use std::io::Cursor;
  68 use bitcoin::bech32::u5;
  69
  70 const MAX_FEE: u32 = 10_000;
  71 struct FuzzEstimator {
  72         ret_val: atomic::AtomicU32,
  73 }
  74 impl FeeEstimator for FuzzEstimator {
  75         fn get_est_sat_per_1000_weight(&self, conf_target: ConfirmationTarget) -> u32 {
  76                 // We force-close channels if our counterparty sends us a feerate which is a small multiple
  77                 // of our HighPriority fee estimate or smaller than our Background fee estimate. Thus, we
  78                 // always return a HighPriority feerate here which is >= the maximum Normal feerate and a
  79                 // Background feerate which is <= the minimum Normal feerate.
  80                 match conf_target {
  81                         ConfirmationTarget::HighPriority => MAX_FEE,
  82                         ConfirmationTarget::Background => 253,
  83                         ConfirmationTarget::Normal => cmp::min(self.ret_val.load(atomic::Ordering::Acquire), MAX_FEE),
  84                 }
  85         }
  86 }
  87
  88 pub struct TestBroadcaster {}
  89 impl BroadcasterInterface for TestBroadcaster {
  90         fn broadcast_transaction(&self, _tx: &Transaction) { }
  91 }
  92
  93 pub struct VecWriter(pub Vec<u8>);
  94 impl Writer for VecWriter {
  95         fn write_all(&mut self, buf: &[u8]) -> Result<(), ::std::io::Error> {
  96                 self.0.extend_from_slice(buf);
  97                 Ok(())
  98         }
  99 }
 100
 101 struct TestChainMonitor {
 102         pub logger: Arc<dyn Logger>,
 103         pub keys: Arc<KeyProvider>,
 104         pub persister: Arc<TestPersister>,
 105         pub chain_monitor: Arc<chainmonitor::ChainMonitor<EnforcingSigner, Arc<dyn chain::Filter>, Arc<TestBroadcaster>, Arc<FuzzEstimator>, Arc<dyn Logger>, Arc<TestPersister>>>,
 106         // If we reload a node with an old copy of ChannelMonitors, the ChannelManager deserialization
 107         // logic will automatically force-close our channels for us (as we don't have an up-to-date
 108         // monitor implying we are not able to punish misbehaving counterparties). Because this test
 109         // "fails" if we ever force-close a channel, we avoid doing so, always saving the latest
 110         // fully-serialized monitor state here, as well as the corresponding update_id.
 111         pub latest_monitors: Mutex<HashMap<OutPoint, (u64, Vec<u8>)>>,
 112         pub should_update_manager: atomic::AtomicBool,
 113 }
 114 impl TestChainMonitor {
 115         pub fn new(broadcaster: Arc<TestBroadcaster>, logger: Arc<dyn Logger>, feeest: Arc<FuzzEstimator>, persister: Arc<TestPersister>, keys: Arc<KeyProvider>) -> Self {
 116                 Self {
 117                         chain_monitor: Arc::new(chainmonitor::ChainMonitor::new(None, broadcaster, logger.clone(), feeest, Arc::clone(&persister))),
 118                         logger,
 119                         keys,
 120                         persister,
 121                         latest_monitors: Mutex::new(HashMap::new()),
 122                         should_update_manager: atomic::AtomicBool::new(false),
 123                 }
 124         }
 125 }
 126 impl chain::Watch<EnforcingSigner> for TestChainMonitor {
 127         fn watch_channel(&self, funding_txo: OutPoint, monitor: channelmonitor::ChannelMonitor<EnforcingSigner>) -> chain::ChannelMonitorUpdateStatus {
 128                 let mut ser = VecWriter(Vec::new());
 129                 monitor.write(&mut ser).unwrap();
 130                 if let Some(_) = self.latest_monitors.lock().unwrap().insert(funding_txo, (monitor.get_latest_update_id(), ser.0)) {
 131                         panic!("Already had monitor pre-watch_channel");
 132                 }
 133                 self.should_update_manager.store(true, atomic::Ordering::Relaxed);
 134                 self.chain_monitor.watch_channel(funding_txo, monitor)
 135         }
 136
 137         fn update_channel(&self, funding_txo: OutPoint, update: channelmonitor::ChannelMonitorUpdate) -> chain::ChannelMonitorUpdateStatus {
 138                 let mut map_lock = self.latest_monitors.lock().unwrap();
 139                 let mut map_entry = match map_lock.entry(funding_txo) {
 140                         hash_map::Entry::Occupied(entry) => entry,
 141                         hash_map::Entry::Vacant(_) => panic!("Didn't have monitor on update call"),
 142                 };
 143                 let deserialized_monitor = <(BlockHash, channelmonitor::ChannelMonitor<EnforcingSigner>)>::
 144                         read(&mut Cursor::new(&map_entry.get().1), &*self.keys).unwrap().1;
 145                 deserialized_monitor.update_monitor(&update, &&TestBroadcaster{}, &FuzzEstimator { ret_val: atomic::AtomicU32::new(253) }, &self.logger).unwrap();
 146                 let mut ser = VecWriter(Vec::new());
 147                 deserialized_monitor.write(&mut ser).unwrap();
 148                 map_entry.insert((update.update_id, ser.0));
 149                 self.should_update_manager.store(true, atomic::Ordering::Relaxed);
 150                 self.chain_monitor.update_channel(funding_txo, update)
 151         }
 152
 153         fn release_pending_monitor_events(&self) -> Vec<(OutPoint, Vec<MonitorEvent>, Option<PublicKey>)> {
 154                 return self.chain_monitor.release_pending_monitor_events();
 155         }
 156 }
 157
 158 struct KeyProvider {
 159         node_id: u8,
 160         rand_bytes_id: atomic::AtomicU32,
 161         enforcement_states: Mutex<HashMap<[u8;32], Arc<Mutex<EnforcementState>>>>,
 162 }
 163
 164 impl EntropySource for KeyProvider {
 165         fn get_secure_random_bytes(&self) -> [u8; 32] {
 166                 let id = self.rand_bytes_id.fetch_add(1, atomic::Ordering::Relaxed);
 167                 let mut res = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 11, self.node_id];
 168                 res[30-4..30].copy_from_slice(&id.to_le_bytes());
 169                 res
 170         }
 171 }
 172
 173 impl NodeSigner for KeyProvider {
 174         fn get_node_secret(&self, _recipient: Recipient) -> Result<SecretKey, ()> {
 175                 Ok(SecretKey::from_slice(&[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, self.node_id]).unwrap())
 176         }
 177
 178         fn get_node_id(&self, recipient: Recipient) -> Result<PublicKey, ()> {
 179                 let secp_ctx = Secp256k1::signing_only();
 180                 Ok(PublicKey::from_secret_key(&secp_ctx, &self.get_node_secret(recipient)?))
 181         }
 182
 183         fn ecdh(&self, recipient: Recipient, other_key: &PublicKey, tweak: Option<&Scalar>) -> Result<SharedSecret, ()> {
 184                 let mut node_secret = self.get_node_secret(recipient)?;
 185                 if let Some(tweak) = tweak {
 186                         node_secret = node_secret.mul_tweak(tweak).unwrap();
 187                 }
 188                 Ok(SharedSecret::new(other_key, &node_secret))
 189         }
 190
 191         fn get_inbound_payment_key_material(&self) -> KeyMaterial {
 192                 KeyMaterial([0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, self.node_id])
 193         }
 194
 195         fn sign_invoice(&self, _hrp_bytes: &[u8], _invoice_data: &[u5], _recipient: Recipient) -> Result<RecoverableSignature, ()> {
 196                 unreachable!()
 197         }
 198 }
 199
 200 impl SignerProvider for KeyProvider {
 201         type Signer = EnforcingSigner;
 202
 203         fn generate_channel_keys_id(&self, _inbound: bool, _channel_value_satoshis: u64, _user_channel_id: u128) -> [u8; 32] {
 204                 let id = self.rand_bytes_id.fetch_add(1, atomic::Ordering::Relaxed) as u8;
 205                 [id; 32]
 206         }
 207
 208         fn derive_channel_signer(&self, channel_value_satoshis: u64, channel_keys_id: [u8; 32]) -> Self::Signer {
 209                 let secp_ctx = Secp256k1::signing_only();
 210                 let id = channel_keys_id[0];
 211                 let keys = InMemorySigner::new(
 212                         &secp_ctx,
 213                         self.get_node_secret(Recipient::Node).unwrap(),
 214                         SecretKey::from_slice(&[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, self.node_id]).unwrap(),
 215                         SecretKey::from_slice(&[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 5, self.node_id]).unwrap(),
 216                         SecretKey::from_slice(&[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 6, self.node_id]).unwrap(),
 217                         SecretKey::from_slice(&[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, self.node_id]).unwrap(),
 218                         SecretKey::from_slice(&[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, self.node_id]).unwrap(),
 219                         [id, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 9, self.node_id],
 220                         channel_value_satoshis,
 221                         channel_keys_id,
 222                 );
 223                 let revoked_commitment = self.make_enforcement_state_cell(keys.commitment_seed);
 224                 EnforcingSigner::new_with_revoked(keys, revoked_commitment, false)
 225         }
 226
 227         fn read_chan_signer(&self, buffer: &[u8]) -> Result<Self::Signer, DecodeError> {
 228                 let mut reader = std::io::Cursor::new(buffer);
 229
 230                 let inner: InMemorySigner = ReadableArgs::read(&mut reader, self.get_node_secret(Recipient::Node).unwrap())?;
 231                 let state = self.make_enforcement_state_cell(inner.commitment_seed);
 232
 233                 Ok(EnforcingSigner {
 234                         inner,
 235                         state,
 236                         disable_revocation_policy_check: false,
 237                 })
 238         }
 239
 240         fn get_destination_script(&self) -> Script {
 241                 let secp_ctx = Secp256k1::signing_only();
 242                 let channel_monitor_claim_key = SecretKey::from_slice(&[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, self.node_id]).unwrap();
 243                 let our_channel_monitor_claim_key_hash = WPubkeyHash::hash(&PublicKey::from_secret_key(&secp_ctx, &channel_monitor_claim_key).serialize());
 244                 Builder::new().push_opcode(opcodes::all::OP_PUSHBYTES_0).push_slice(&our_channel_monitor_claim_key_hash[..]).into_script()
 245         }
 246
 247         fn get_shutdown_scriptpubkey(&self) -> ShutdownScript {
 248                 let secp_ctx = Secp256k1::signing_only();
 249                 let secret_key = SecretKey::from_slice(&[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, self.node_id]).unwrap();
 250                 let pubkey_hash = WPubkeyHash::hash(&PublicKey::from_secret_key(&secp_ctx, &secret_key).serialize());
 251                 ShutdownScript::new_p2wpkh(&pubkey_hash)
 252         }
 253 }
 254
 255 impl KeysInterface for KeyProvider {}
 256
 257 impl KeyProvider {
 258         fn make_enforcement_state_cell(&self, commitment_seed: [u8; 32]) -> Arc<Mutex<EnforcementState>> {
 259                 let mut revoked_commitments = self.enforcement_states.lock().unwrap();
 260                 if !revoked_commitments.contains_key(&commitment_seed) {
 261                         revoked_commitments.insert(commitment_seed, Arc::new(Mutex::new(EnforcementState::new())));
 262                 }
 263                 let cell = revoked_commitments.get(&commitment_seed).unwrap();
 264                 Arc::clone(cell)
 265         }
 266 }
 267
 268 #[inline]
 269 fn check_api_err(api_err: APIError) {
 270         match api_err {
 271                 APIError::APIMisuseError { .. } => panic!("We can't misuse the API"),
 272                 APIError::FeeRateTooHigh { .. } => panic!("We can't send too much fee?"),
 273                 APIError::InvalidRoute { .. } => panic!("Our routes should work"),
 274                 APIError::ChannelUnavailable { err } => {
 275                         // Test the error against a list of errors we can hit, and reject
 276                         // all others. If you hit this panic, the list of acceptable errors
 277                         // is probably just stale and you should add new messages here.
 278                         match err.as_str() {
 279                                 "Peer for first hop currently disconnected/pending monitor update!" => {},
 280                                 _ if err.starts_with("Cannot push more than their max accepted HTLCs ") => {},
 281                                 _ if err.starts_with("Cannot send value that would put us over the max HTLC value in flight our peer will accept ") => {},
 282                                 _ if err.starts_with("Cannot send value that would put our balance under counterparty-announced channel reserve value") => {},
 283                                 _ if err.starts_with("Cannot send value that would put counterparty balance under holder-announced channel reserve value") => {},
 284                                 _ if err.starts_with("Cannot send value that would overdraw remaining funds.") => {},
 285                                 _ if err.starts_with("Cannot send value that would not leave enough to pay for fees.") => {},
 286                                 _ if err.starts_with("Cannot send value that would put our exposure to dust HTLCs at") => {},
 287                                 _ => panic!("{}", err),
 288                         }
 289                 },
 290                 APIError::MonitorUpdateInProgress => {
 291                         // We can (obviously) temp-fail a monitor update
 292                 },
 293                 APIError::IncompatibleShutdownScript { .. } => panic!("Cannot send an incompatible shutdown script"),
 294         }
 295 }
 296 #[inline]
 297 fn check_payment_err(send_err: PaymentSendFailure) {
 298         match send_err {
 299                 PaymentSendFailure::ParameterError(api_err) => check_api_err(api_err),
 300                 PaymentSendFailure::PathParameterError(per_path_results) => {
 301                         for res in per_path_results { if let Err(api_err) = res { check_api_err(api_err); } }
 302                 },
 303                 PaymentSendFailure::AllFailedResendSafe(per_path_results) => {
 304                         for api_err in per_path_results { check_api_err(api_err); }
 305                 },
 306                 PaymentSendFailure::PartialFailure { results, .. } => {
 307                         for res in results { if let Err(api_err) = res { check_api_err(api_err); } }
 308                 },
 309                 PaymentSendFailure::DuplicatePayment => panic!(),
 310         }
 311 }
 312
 313 type ChanMan = ChannelManager<Arc<TestChainMonitor>, Arc<TestBroadcaster>, Arc<KeyProvider>, Arc<FuzzEstimator>, Arc<dyn Logger>>;
 314
 315 #[inline]
 316 fn get_payment_secret_hash(dest: &ChanMan, payment_id: &mut u8) -> Option<(PaymentSecret, PaymentHash)> {
 317         let mut payment_hash;
 318         for _ in 0..256 {
 319                 payment_hash = PaymentHash(Sha256::hash(&[*payment_id; 1]).into_inner());
 320                 if let Ok(payment_secret) = dest.create_inbound_payment_for_hash(payment_hash, None, 3600) {
 321                         return Some((payment_secret, payment_hash));
 322                 }
 323                 *payment_id = payment_id.wrapping_add(1);
 324         }
 325         None
 326 }
 327
 328 #[inline]
 329 fn send_payment(source: &ChanMan, dest: &ChanMan, dest_chan_id: u64, amt: u64, payment_id: &mut u8, payment_idx: &mut u64) -> bool {
 330         let (payment_secret, payment_hash) =
 331                 if let Some((secret, hash)) = get_payment_secret_hash(dest, payment_id) { (secret, hash) } else { return true; };
 332         let mut payment_id = [0; 32];
 333         payment_id[0..8].copy_from_slice(&payment_idx.to_ne_bytes());
 334         *payment_idx += 1;
 335         if let Err(err) = source.send_payment(&Route {
 336                 paths: vec![vec![RouteHop {
 337                         pubkey: dest.get_our_node_id(),
 338                         node_features: channelmanager::provided_node_features(),
 339                         short_channel_id: dest_chan_id,
 340                         channel_features: channelmanager::provided_channel_features(),
 341                         fee_msat: amt,
 342                         cltv_expiry_delta: 200,
 343                 }]],
 344                 payment_params: None,
 345         }, payment_hash, &Some(payment_secret), PaymentId(payment_id)) {
 346                 check_payment_err(err);
 347                 false
 348         } else { true }
 349 }
 350 #[inline]
 351 fn send_hop_payment(source: &ChanMan, middle: &ChanMan, middle_chan_id: u64, dest: &ChanMan, dest_chan_id: u64, amt: u64, payment_id: &mut u8, payment_idx: &mut u64) -> bool {
 352         let (payment_secret, payment_hash) =
 353                 if let Some((secret, hash)) = get_payment_secret_hash(dest, payment_id) { (secret, hash) } else { return true; };
 354         let mut payment_id = [0; 32];
 355         payment_id[0..8].copy_from_slice(&payment_idx.to_ne_bytes());
 356         *payment_idx += 1;
 357         if let Err(err) = source.send_payment(&Route {
 358                 paths: vec![vec![RouteHop {
 359                         pubkey: middle.get_our_node_id(),
 360                         node_features: channelmanager::provided_node_features(),
 361                         short_channel_id: middle_chan_id,
 362                         channel_features: channelmanager::provided_channel_features(),
 363                         fee_msat: 50000,
 364                         cltv_expiry_delta: 100,
 365                 },RouteHop {
 366                         pubkey: dest.get_our_node_id(),
 367                         node_features: channelmanager::provided_node_features(),
 368                         short_channel_id: dest_chan_id,
 369                         channel_features: channelmanager::provided_channel_features(),
 370                         fee_msat: amt,
 371                         cltv_expiry_delta: 200,
 372                 }]],
 373                 payment_params: None,
 374         }, payment_hash, &Some(payment_secret), PaymentId(payment_id)) {
 375                 check_payment_err(err);
 376                 false
 377         } else { true }
 378 }
 379
 380 #[inline]
 381 pub fn do_test<Out: Output>(data: &[u8], underlying_out: Out) {
 382         let out = SearchingOutput::new(underlying_out);
 383         let broadcast = Arc::new(TestBroadcaster{});
 384
 385         macro_rules! make_node {
 386                 ($node_id: expr, $fee_estimator: expr) => { {
 387                         let logger: Arc<dyn Logger> = Arc::new(test_logger::TestLogger::new($node_id.to_string(), out.clone()));
 388                         let keys_manager = Arc::new(KeyProvider { node_id: $node_id, rand_bytes_id: atomic::AtomicU32::new(0), enforcement_states: Mutex::new(HashMap::new()) });
 389                         let monitor = Arc::new(TestChainMonitor::new(broadcast.clone(), logger.clone(), $fee_estimator.clone(),
 390                                 Arc::new(TestPersister {
 391                                         update_ret: Mutex::new(ChannelMonitorUpdateStatus::Completed)
 392                                 }), Arc::clone(&keys_manager)));
 393
 394                         let mut config = UserConfig::default();
 395                         config.channel_config.forwarding_fee_proportional_millionths = 0;
 396                         config.channel_handshake_config.announced_channel = true;
 397                         let network = Network::Bitcoin;
 398                         let params = ChainParameters {
 399                                 network,
 400                                 best_block: BestBlock::from_genesis(network),
 401                         };
 402                         (ChannelManager::new($fee_estimator.clone(), monitor.clone(), broadcast.clone(), Arc::clone(&logger), keys_manager.clone(), config, params),
 403                         monitor, keys_manager)
 404                 } }
 405         }
 406
 407         macro_rules! reload_node {
 408                 ($ser: expr, $node_id: expr, $old_monitors: expr, $keys_manager: expr, $fee_estimator: expr) => { {
 409                     let keys_manager = Arc::clone(& $keys_manager);
 410                         let logger: Arc<dyn Logger> = Arc::new(test_logger::TestLogger::new($node_id.to_string(), out.clone()));
 411                         let chain_monitor = Arc::new(TestChainMonitor::new(broadcast.clone(), logger.clone(), $fee_estimator.clone(),
 412                                 Arc::new(TestPersister {
 413                                         update_ret: Mutex::new(ChannelMonitorUpdateStatus::Completed)
 414                                 }), Arc::clone(& $keys_manager)));
 415
 416                         let mut config = UserConfig::default();
 417                         config.channel_config.forwarding_fee_proportional_millionths = 0;
 418                         config.channel_handshake_config.announced_channel = true;
 419
 420                         let mut monitors = HashMap::new();
 421                         let mut old_monitors = $old_monitors.latest_monitors.lock().unwrap();
 422                         for (outpoint, (update_id, monitor_ser)) in old_monitors.drain() {
 423                                 monitors.insert(outpoint, <(BlockHash, ChannelMonitor<EnforcingSigner>)>::read(&mut Cursor::new(&monitor_ser), &*$keys_manager).expect("Failed to read monitor").1);
 424                                 chain_monitor.latest_monitors.lock().unwrap().insert(outpoint, (update_id, monitor_ser));
 425                         }
 426                         let mut monitor_refs = HashMap::new();
 427                         for (outpoint, monitor) in monitors.iter_mut() {
 428                                 monitor_refs.insert(*outpoint, monitor);
 429                         }
 430
 431                         let read_args = ChannelManagerReadArgs {
 432                                 keys_manager,
 433                                 fee_estimator: $fee_estimator.clone(),
 434                                 chain_monitor: chain_monitor.clone(),
 435                                 tx_broadcaster: broadcast.clone(),
 436                                 logger,
 437                                 default_config: config,
 438                                 channel_monitors: monitor_refs,
 439                         };
 440
 441                         let res = (<(BlockHash, ChanMan)>::read(&mut Cursor::new(&$ser.0), read_args).expect("Failed to read manager").1, chain_monitor.clone());
 442                         for (funding_txo, mon) in monitors.drain() {
 443                                 assert_eq!(chain_monitor.chain_monitor.watch_channel(funding_txo, mon),
 444                                         ChannelMonitorUpdateStatus::Completed);
 445                         }
 446                         res
 447                 } }
 448         }
 449
 450         let mut channel_txn = Vec::new();
 451         macro_rules! make_channel {
 452                 ($source: expr, $dest: expr, $chan_id: expr) => { {
 453                         $source.peer_connected(&$dest.get_our_node_id(), &Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
 454                         $dest.peer_connected(&$source.get_our_node_id(), &Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
 455
 456                         $source.create_channel($dest.get_our_node_id(), 100_000, 42, 0, None).unwrap();
 457                         let open_channel = {
 458                                 let events = $source.get_and_clear_pending_msg_events();
 459                                 assert_eq!(events.len(), 1);
 460                                 if let events::MessageSendEvent::SendOpenChannel { ref msg, .. } = events[0] {
 461                                         msg.clone()
 462                                 } else { panic!("Wrong event type"); }
 463                         };
 464
 465                         $dest.handle_open_channel(&$source.get_our_node_id(), channelmanager::provided_init_features(), &open_channel);
 466                         let accept_channel = {
 467                                 let events = $dest.get_and_clear_pending_msg_events();
 468                                 assert_eq!(events.len(), 1);
 469                                 if let events::MessageSendEvent::SendAcceptChannel { ref msg, .. } = events[0] {
 470                                         msg.clone()
 471                                 } else { panic!("Wrong event type"); }
 472                         };
 473
 474                         $source.handle_accept_channel(&$dest.get_our_node_id(), channelmanager::provided_init_features(), &accept_channel);
 475                         let funding_output;
 476                         {
 477                                 let events = $source.get_and_clear_pending_events();
 478                                 assert_eq!(events.len(), 1);
 479                                 if let events::Event::FundingGenerationReady { ref temporary_channel_id, ref channel_value_satoshis, ref output_script, .. } = events[0] {
 480                                         let tx = Transaction { version: $chan_id, lock_time: PackedLockTime::ZERO, input: Vec::new(), output: vec![TxOut {
 481                                                 value: *channel_value_satoshis, script_pubkey: output_script.clone(),
 482                                         }]};
 483                                         funding_output = OutPoint { txid: tx.txid(), index: 0 };
 484                                         $source.funding_transaction_generated(&temporary_channel_id, &$dest.get_our_node_id(), tx.clone()).unwrap();
 485                                         channel_txn.push(tx);
 486                                 } else { panic!("Wrong event type"); }
 487                         }
 488
 489                         let funding_created = {
 490                                 let events = $source.get_and_clear_pending_msg_events();
 491                                 assert_eq!(events.len(), 1);
 492                                 if let events::MessageSendEvent::SendFundingCreated { ref msg, .. } = events[0] {
 493                                         msg.clone()
 494                                 } else { panic!("Wrong event type"); }
 495                         };
 496                         $dest.handle_funding_created(&$source.get_our_node_id(), &funding_created);
 497
 498                         let funding_signed = {
 499                                 let events = $dest.get_and_clear_pending_msg_events();
 500                                 assert_eq!(events.len(), 1);
 501                                 if let events::MessageSendEvent::SendFundingSigned { ref msg, .. } = events[0] {
 502                                         msg.clone()
 503                                 } else { panic!("Wrong event type"); }
 504                         };
 505                         $source.handle_funding_signed(&$dest.get_our_node_id(), &funding_signed);
 506
 507                         funding_output
 508                 } }
 509         }
 510
 511         macro_rules! confirm_txn {
 512                 ($node: expr) => { {
 513                         let chain_hash = genesis_block(Network::Bitcoin).block_hash();
 514                         let mut header = BlockHeader { version: 0x20000000, prev_blockhash: chain_hash, merkle_root: TxMerkleNode::all_zeros(), time: 42, bits: 42, nonce: 42 };
 515                         let txdata: Vec<_> = channel_txn.iter().enumerate().map(|(i, tx)| (i + 1, tx)).collect();
 516                         $node.transactions_confirmed(&header, &txdata, 1);
 517                         for _ in 2..100 {
 518                                 header = BlockHeader { version: 0x20000000, prev_blockhash: header.block_hash(), merkle_root: TxMerkleNode::all_zeros(), time: 42, bits: 42, nonce: 42 };
 519                         }
 520                         $node.best_block_updated(&header, 99);
 521                 } }
 522         }
 523
 524         macro_rules! lock_fundings {
 525                 ($nodes: expr) => { {
 526                         let mut node_events = Vec::new();
 527                         for node in $nodes.iter() {
 528                                 node_events.push(node.get_and_clear_pending_msg_events());
 529                         }
 530                         for (idx, node_event) in node_events.iter().enumerate() {
 531                                 for event in node_event {
 532                                         if let events::MessageSendEvent::SendChannelReady { ref node_id, ref msg } = event {
 533                                                 for node in $nodes.iter() {
 534                                                         if node.get_our_node_id() == *node_id {
 535                                                                 node.handle_channel_ready(&$nodes[idx].get_our_node_id(), msg);
 536                                                         }
 537                                                 }
 538                                         } else { panic!("Wrong event type"); }
 539                                 }
 540                         }
 541
 542                         for node in $nodes.iter() {
 543                                 let events = node.get_and_clear_pending_msg_events();
 544                                 for event in events {
 545                                         if let events::MessageSendEvent::SendAnnouncementSignatures { .. } = event {
 546                                         } else { panic!("Wrong event type"); }
 547                                 }
 548                         }
 549                 } }
 550         }
 551
 552         let fee_est_a = Arc::new(FuzzEstimator { ret_val: atomic::AtomicU32::new(253) });
 553         let mut last_htlc_clear_fee_a =  253;
 554         let fee_est_b = Arc::new(FuzzEstimator { ret_val: atomic::AtomicU32::new(253) });
 555         let mut last_htlc_clear_fee_b =  253;
 556         let fee_est_c = Arc::new(FuzzEstimator { ret_val: atomic::AtomicU32::new(253) });
 557         let mut last_htlc_clear_fee_c =  253;
 558
 559         // 3 nodes is enough to hit all the possible cases, notably unknown-source-unknown-dest
 560         // forwarding.
 561         let (node_a, mut monitor_a, keys_manager_a) = make_node!(0, fee_est_a);
 562         let (node_b, mut monitor_b, keys_manager_b) = make_node!(1, fee_est_b);
 563         let (node_c, mut monitor_c, keys_manager_c) = make_node!(2, fee_est_c);
 564
 565         let mut nodes = [node_a, node_b, node_c];
 566
 567         let chan_1_funding = make_channel!(nodes[0], nodes[1], 0);
 568         let chan_2_funding = make_channel!(nodes[1], nodes[2], 1);
 569
 570         for node in nodes.iter() {
 571                 confirm_txn!(node);
 572         }
 573
 574         lock_fundings!(nodes);
 575
 576         let chan_a = nodes[0].list_usable_channels()[0].short_channel_id.unwrap();
 577         let chan_b = nodes[2].list_usable_channels()[0].short_channel_id.unwrap();
 578
 579         let mut payment_id: u8 = 0;
 580         let mut payment_idx: u64 = 0;
 581
 582         let mut chan_a_disconnected = false;
 583         let mut chan_b_disconnected = false;
 584         let mut ab_events = Vec::new();
 585         let mut ba_events = Vec::new();
 586         let mut bc_events = Vec::new();
 587         let mut cb_events = Vec::new();
 588
 589         let mut node_a_ser = VecWriter(Vec::new());
 590         nodes[0].write(&mut node_a_ser).unwrap();
 591         let mut node_b_ser = VecWriter(Vec::new());
 592         nodes[1].write(&mut node_b_ser).unwrap();
 593         let mut node_c_ser = VecWriter(Vec::new());
 594         nodes[2].write(&mut node_c_ser).unwrap();
 595
 596         macro_rules! test_return {
 597                 () => { {
 598                         assert_eq!(nodes[0].list_channels().len(), 1);
 599                         assert_eq!(nodes[1].list_channels().len(), 2);
 600                         assert_eq!(nodes[2].list_channels().len(), 1);
 601                         return;
 602                 } }
 603         }
 604
 605         let mut read_pos = 0;
 606         macro_rules! get_slice {
 607                 ($len: expr) => {
 608                         {
 609                                 let slice_len = $len as usize;
 610                                 if data.len() < read_pos + slice_len {
 611                                         test_return!();
 612                                 }
 613                                 read_pos += slice_len;
 614                                 &data[read_pos - slice_len..read_pos]
 615                         }
 616                 }
 617         }
 618
 619         loop {
 620                 // Push any events from Node B onto ba_events and bc_events
 621                 macro_rules! push_excess_b_events {
 622                         ($excess_events: expr, $expect_drop_node: expr) => { {
 623                                 let a_id = nodes[0].get_our_node_id();
 624                                 let expect_drop_node: Option<usize> = $expect_drop_node;
 625                                 let expect_drop_id = if let Some(id) = expect_drop_node { Some(nodes[id].get_our_node_id()) } else { None };
 626                                 for event in $excess_events {
 627                                         let push_a = match event {
 628                                                 events::MessageSendEvent::UpdateHTLCs { ref node_id, .. } => {
 629                                                         if Some(*node_id) == expect_drop_id { panic!("peer_disconnected should drop msgs bound for the disconnected peer"); }
 630                                                         *node_id == a_id
 631                                                 },
 632                                                 events::MessageSendEvent::SendRevokeAndACK { ref node_id, .. } => {
 633                                                         if Some(*node_id) == expect_drop_id { panic!("peer_disconnected should drop msgs bound for the disconnected peer"); }
 634                                                         *node_id == a_id
 635                                                 },
 636                                                 events::MessageSendEvent::SendChannelReestablish { ref node_id, .. } => {
 637                                                         if Some(*node_id) == expect_drop_id { panic!("peer_disconnected should drop msgs bound for the disconnected peer"); }
 638                                                         *node_id == a_id
 639                                                 },
 640                                                 events::MessageSendEvent::SendChannelReady { .. } => continue,
 641                                                 events::MessageSendEvent::SendAnnouncementSignatures { .. } => continue,
 642                                                 events::MessageSendEvent::SendChannelUpdate { ref node_id, ref msg } => {
 643                                                         assert_eq!(msg.contents.flags & 2, 0); // The disable bit must never be set!
 644                                                         if Some(*node_id) == expect_drop_id { panic!("peer_disconnected should drop msgs bound for the disconnected peer"); }
 645                                                         *node_id == a_id
 646                                                 },
 647                                                 _ => panic!("Unhandled message event {:?}", event),
 648                                         };
 649                                         if push_a { ba_events.push(event); } else { bc_events.push(event); }
 650                                 }
 651                         } }
 652                 }
 653
 654                 // While delivering messages, we select across three possible message selection processes
 655                 // to ensure we get as much coverage as possible. See the individual enum variants for more
 656                 // details.
 657                 #[derive(PartialEq)]
 658                 enum ProcessMessages {
 659                         /// Deliver all available messages, including fetching any new messages from
 660                         /// `get_and_clear_pending_msg_events()` (which may have side effects).
 661                         AllMessages,
 662                         /// Call `get_and_clear_pending_msg_events()` first, and then deliver up to one
 663                         /// message (which may already be queued).
 664                         OneMessage,
 665                         /// Deliver up to one already-queued message. This avoids any potential side-effects
 666                         /// of `get_and_clear_pending_msg_events()` (eg freeing the HTLC holding cell), which
 667                         /// provides potentially more coverage.
 668                         OnePendingMessage,
 669                 }
 670
 671                 macro_rules! process_msg_events {
 672                         ($node: expr, $corrupt_forward: expr, $limit_events: expr) => { {
 673                                 let mut events = if $node == 1 {
 674                                         let mut new_events = Vec::new();
 675                                         mem::swap(&mut new_events, &mut ba_events);
 676                                         new_events.extend_from_slice(&bc_events[..]);
 677                                         bc_events.clear();
 678                                         new_events
 679                                 } else if $node == 0 {
 680                                         let mut new_events = Vec::new();
 681                                         mem::swap(&mut new_events, &mut ab_events);
 682                                         new_events
 683                                 } else {
 684                                         let mut new_events = Vec::new();
 685                                         mem::swap(&mut new_events, &mut cb_events);
 686                                         new_events
 687                                 };
 688                                 let mut new_events = Vec::new();
 689                                 if $limit_events != ProcessMessages::OnePendingMessage {
 690                                         new_events = nodes[$node].get_and_clear_pending_msg_events();
 691                                 }
 692                                 let mut had_events = false;
 693                                 let mut events_iter = events.drain(..).chain(new_events.drain(..));
 694                                 let mut extra_ev = None;
 695                                 for event in &mut events_iter {
 696                                         had_events = true;
 697                                         match event {
 698                                                 events::MessageSendEvent::UpdateHTLCs { node_id, updates: CommitmentUpdate { update_add_htlcs, update_fail_htlcs, update_fulfill_htlcs, update_fail_malformed_htlcs, update_fee, commitment_signed } } => {
 699                                                         for (idx, dest) in nodes.iter().enumerate() {
 700                                                                 if dest.get_our_node_id() == node_id {
 701                                                                         for update_add in update_add_htlcs.iter() {
 702                                                                                 out.locked_write(format!("Delivering update_add_htlc to node {}.\n", idx).as_bytes());
 703                                                                                 if !$corrupt_forward {
 704                                                                                         dest.handle_update_add_htlc(&nodes[$node].get_our_node_id(), update_add);
 705                                                                                 } else {
 706                                                                                         // Corrupt the update_add_htlc message so that its HMAC
 707                                                                                         // check will fail and we generate a
 708                                                                                         // update_fail_malformed_htlc instead of an
 709                                                                                         // update_fail_htlc as we do when we reject a payment.
 710                                                                                         let mut msg_ser = update_add.encode();
 711                                                                                         msg_ser[1000] ^= 0xff;
 712                                                                                         let new_msg = UpdateAddHTLC::read(&mut Cursor::new(&msg_ser)).unwrap();
 713                                                                                         dest.handle_update_add_htlc(&nodes[$node].get_our_node_id(), &new_msg);
 714                                                                                 }
 715                                                                         }
 716                                                                         for update_fulfill in update_fulfill_htlcs.iter() {
 717                                                                                 out.locked_write(format!("Delivering update_fulfill_htlc to node {}.\n", idx).as_bytes());
 718                                                                                 dest.handle_update_fulfill_htlc(&nodes[$node].get_our_node_id(), update_fulfill);
 719                                                                         }
 720                                                                         for update_fail in update_fail_htlcs.iter() {
 721                                                                                 out.locked_write(format!("Delivering update_fail_htlc to node {}.\n", idx).as_bytes());
 722                                                                                 dest.handle_update_fail_htlc(&nodes[$node].get_our_node_id(), update_fail);
 723                                                                         }
 724                                                                         for update_fail_malformed in update_fail_malformed_htlcs.iter() {
 725                                                                                 out.locked_write(format!("Delivering update_fail_malformed_htlc to node {}.\n", idx).as_bytes());
 726                                                                                 dest.handle_update_fail_malformed_htlc(&nodes[$node].get_our_node_id(), update_fail_malformed);
 727                                                                         }
 728                                                                         if let Some(msg) = update_fee {
 729                                                                                 out.locked_write(format!("Delivering update_fee to node {}.\n", idx).as_bytes());
 730                                                                                 dest.handle_update_fee(&nodes[$node].get_our_node_id(), &msg);
 731                                                                         }
 732                                                                         let processed_change = !update_add_htlcs.is_empty() || !update_fulfill_htlcs.is_empty() ||
 733                                                                                 !update_fail_htlcs.is_empty() || !update_fail_malformed_htlcs.is_empty();
 734                                                                         if $limit_events != ProcessMessages::AllMessages && processed_change {
 735                                                                                 // If we only want to process some messages, don't deliver the CS until later.
 736                                                                                 extra_ev = Some(events::MessageSendEvent::UpdateHTLCs { node_id, updates: CommitmentUpdate {
 737                                                                                         update_add_htlcs: Vec::new(),
 738                                                                                         update_fail_htlcs: Vec::new(),
 739                                                                                         update_fulfill_htlcs: Vec::new(),
 740                                                                                         update_fail_malformed_htlcs: Vec::new(),
 741                                                                                         update_fee: None,
 742                                                                                         commitment_signed
 743                                                                                 } });
 744                                                                                 break;
 745                                                                         }
 746                                                                         out.locked_write(format!("Delivering commitment_signed to node {}.\n", idx).as_bytes());
 747                                                                         dest.handle_commitment_signed(&nodes[$node].get_our_node_id(), &commitment_signed);
 748                                                                         break;
 749                                                                 }
 750                                                         }
 751                                                 },
 752                                                 events::MessageSendEvent::SendRevokeAndACK { ref node_id, ref msg } => {
 753                                                         for (idx, dest) in nodes.iter().enumerate() {
 754                                                                 if dest.get_our_node_id() == *node_id {
 755                                                                         out.locked_write(format!("Delivering revoke_and_ack to node {}.\n", idx).as_bytes());
 756                                                                         dest.handle_revoke_and_ack(&nodes[$node].get_our_node_id(), msg);
 757                                                                 }
 758                                                         }
 759                                                 },
 760                                                 events::MessageSendEvent::SendChannelReestablish { ref node_id, ref msg } => {
 761                                                         for (idx, dest) in nodes.iter().enumerate() {
 762                                                                 if dest.get_our_node_id() == *node_id {
 763                                                                         out.locked_write(format!("Delivering channel_reestablish to node {}.\n", idx).as_bytes());
 764                                                                         dest.handle_channel_reestablish(&nodes[$node].get_our_node_id(), msg);
 765                                                                 }
 766                                                         }
 767                                                 },
 768                                                 events::MessageSendEvent::SendChannelReady { .. } => {
 769                                                         // Can be generated as a reestablish response
 770                                                 },
 771                                                 events::MessageSendEvent::SendAnnouncementSignatures { .. } => {
 772                                                         // Can be generated as a reestablish response
 773                                                 },
 774                                                 events::MessageSendEvent::SendChannelUpdate { ref msg, .. } => {
 775                                                         // When we reconnect we will resend a channel_update to make sure our
 776                                                         // counterparty has the latest parameters for receiving payments
 777                                                         // through us. We do, however, check that the message does not include
 778                                                         // the "disabled" bit, as we should never ever have a channel which is
 779                                                         // disabled when we send such an update (or it may indicate channel
 780                                                         // force-close which we should detect as an error).
 781                                                         assert_eq!(msg.contents.flags & 2, 0);
 782                                                 },
 783                                                 _ => if out.may_fail.load(atomic::Ordering::Acquire) {
 784                                                         return;
 785                                                 } else {
 786                                                         panic!("Unhandled message event {:?}", event)
 787                                                 },
 788                                         }
 789                                         if $limit_events != ProcessMessages::AllMessages {
 790                                                 break;
 791                                         }
 792                                 }
 793                                 if $node == 1 {
 794                                         push_excess_b_events!(extra_ev.into_iter().chain(events_iter), None);
 795                                 } else if $node == 0 {
 796                                         if let Some(ev) = extra_ev { ab_events.push(ev); }
 797                                         for event in events_iter { ab_events.push(event); }
 798                                 } else {
 799                                         if let Some(ev) = extra_ev { cb_events.push(ev); }
 800                                         for event in events_iter { cb_events.push(event); }
 801                                 }
 802                                 had_events
 803                         } }
 804                 }
 805
 806                 macro_rules! drain_msg_events_on_disconnect {
 807                         ($counterparty_id: expr) => { {
 808                                 if $counterparty_id == 0 {
 809                                         for event in nodes[0].get_and_clear_pending_msg_events() {
 810                                                 match event {
 811                                                         events::MessageSendEvent::UpdateHTLCs { .. } => {},
 812                                                         events::MessageSendEvent::SendRevokeAndACK { .. } => {},
 813                                                         events::MessageSendEvent::SendChannelReestablish { .. } => {},
 814                                                         events::MessageSendEvent::SendChannelReady { .. } => {},
 815                                                         events::MessageSendEvent::SendAnnouncementSignatures { .. } => {},
 816                                                         events::MessageSendEvent::SendChannelUpdate { ref msg, .. } => {
 817                                                                 assert_eq!(msg.contents.flags & 2, 0); // The disable bit must never be set!
 818                                                         },
 819                                                         _ => if out.may_fail.load(atomic::Ordering::Acquire) {
 820                                                                 return;
 821                                                         } else {
 822                                                                 panic!("Unhandled message event")
 823                                                         },
 824                                                 }
 825                                         }
 826                                         push_excess_b_events!(nodes[1].get_and_clear_pending_msg_events().drain(..), Some(0));
 827                                         ab_events.clear();
 828                                         ba_events.clear();
 829                                 } else {
 830                                         for event in nodes[2].get_and_clear_pending_msg_events() {
 831                                                 match event {
 832                                                         events::MessageSendEvent::UpdateHTLCs { .. } => {},
 833                                                         events::MessageSendEvent::SendRevokeAndACK { .. } => {},
 834                                                         events::MessageSendEvent::SendChannelReestablish { .. } => {},
 835                                                         events::MessageSendEvent::SendChannelReady { .. } => {},
 836                                                         events::MessageSendEvent::SendAnnouncementSignatures { .. } => {},
 837                                                         events::MessageSendEvent::SendChannelUpdate { ref msg, .. } => {
 838                                                                 assert_eq!(msg.contents.flags & 2, 0); // The disable bit must never be set!
 839                                                         },
 840                                                         _ => if out.may_fail.load(atomic::Ordering::Acquire) {
 841                                                                 return;
 842                                                         } else {
 843                                                                 panic!("Unhandled message event")
 844                                                         },
 845                                                 }
 846                                         }
 847                                         push_excess_b_events!(nodes[1].get_and_clear_pending_msg_events().drain(..), Some(2));
 848                                         bc_events.clear();
 849                                         cb_events.clear();
 850                                 }
 851                         } }
 852                 }
 853
 854                 macro_rules! process_events {
 855                         ($node: expr, $fail: expr) => { {
 856                                 // In case we get 256 payments we may have a hash collision, resulting in the
 857                                 // second claim/fail call not finding the duplicate-hash HTLC, so we have to
 858                                 // deduplicate the calls here.
 859                                 let mut claim_set = HashSet::new();
 860                                 let mut events = nodes[$node].get_and_clear_pending_events();
 861                                 // Sort events so that PendingHTLCsForwardable get processed last. This avoids a
 862                                 // case where we first process a PendingHTLCsForwardable, then claim/fail on a
 863                                 // PaymentClaimable, claiming/failing two HTLCs, but leaving a just-generated
 864                                 // PaymentClaimable event for the second HTLC in our pending_events (and breaking
 865                                 // our claim_set deduplication).
 866                                 events.sort_by(|a, b| {
 867                                         if let events::Event::PaymentClaimable { .. } = a {
 868                                                 if let events::Event::PendingHTLCsForwardable { .. } = b {
 869                                                         Ordering::Less
 870                                                 } else { Ordering::Equal }
 871                                         } else if let events::Event::PendingHTLCsForwardable { .. } = a {
 872                                                 if let events::Event::PaymentClaimable { .. } = b {
 873                                                         Ordering::Greater
 874                                                 } else { Ordering::Equal }
 875                                         } else { Ordering::Equal }
 876                                 });
 877                                 let had_events = !events.is_empty();
 878                                 for event in events.drain(..) {
 879                                         match event {
 880                                                 events::Event::PaymentClaimable { payment_hash, .. } => {
 881                                                         if claim_set.insert(payment_hash.0) {
 882                                                                 if $fail {
 883                                                                         nodes[$node].fail_htlc_backwards(&payment_hash);
 884                                                                 } else {
 885                                                                         nodes[$node].claim_funds(PaymentPreimage(payment_hash.0));
 886                                                                 }
 887                                                         }
 888                                                 },
 889                                                 events::Event::PaymentSent { .. } => {},
 890                                                 events::Event::PaymentClaimed { .. } => {},
 891                                                 events::Event::PaymentPathSuccessful { .. } => {},
 892                                                 events::Event::PaymentPathFailed { .. } => {},
 893                                                 events::Event::ProbeSuccessful { .. } | events::Event::ProbeFailed { .. } => {
 894                                                         // Even though we don't explicitly send probes, because probes are
 895                                                         // detected based on hashing the payment hash+preimage, its rather
 896                                                         // trivial for the fuzzer to build payments that accidentally end up
 897                                                         // looking like probes.
 898                                                 },
 899                                                 events::Event::PaymentForwarded { .. } if $node == 1 => {},
 900                                                 events::Event::ChannelReady { .. } => {},
 901                                                 events::Event::PendingHTLCsForwardable { .. } => {
 902                                                         nodes[$node].process_pending_htlc_forwards();
 903                                                 },
 904                                                 events::Event::HTLCHandlingFailed { .. } => {},
 905                                                 _ => if out.may_fail.load(atomic::Ordering::Acquire) {
 906                                                         return;
 907                                                 } else {
 908                                                         panic!("Unhandled event")
 909                                                 },
 910                                         }
 911                                 }
 912                                 had_events
 913                         } }
 914                 }
 915
 916                 let v = get_slice!(1)[0];
 917                 out.locked_write(format!("READ A BYTE! HANDLING INPUT {:x}...........\n", v).as_bytes());
 918                 match v {
 919                         // In general, we keep related message groups close together in binary form, allowing
 920                         // bit-twiddling mutations to have similar effects. This is probably overkill, but no
 921                         // harm in doing so.
 922
 923                         0x00 => *monitor_a.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::InProgress,
 924                         0x01 => *monitor_b.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::InProgress,
 925                         0x02 => *monitor_c.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::InProgress,
 926                         0x04 => *monitor_a.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed,
 927                         0x05 => *monitor_b.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed,
 928                         0x06 => *monitor_c.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed,
 929
 930                         0x08 => {
 931                                 if let Some((id, _)) = monitor_a.latest_monitors.lock().unwrap().get(&chan_1_funding) {
 932                                         monitor_a.chain_monitor.force_channel_monitor_updated(chan_1_funding, *id);
 933                                         nodes[0].process_monitor_events();
 934                                 }
 935                         },
 936                         0x09 => {
 937                                 if let Some((id, _)) = monitor_b.latest_monitors.lock().unwrap().get(&chan_1_funding) {
 938                                         monitor_b.chain_monitor.force_channel_monitor_updated(chan_1_funding, *id);
 939                                         nodes[1].process_monitor_events();
 940                                 }
 941                         },
 942                         0x0a => {
 943                                 if let Some((id, _)) = monitor_b.latest_monitors.lock().unwrap().get(&chan_2_funding) {
 944                                         monitor_b.chain_monitor.force_channel_monitor_updated(chan_2_funding, *id);
 945                                         nodes[1].process_monitor_events();
 946                                 }
 947                         },
 948                         0x0b => {
 949                                 if let Some((id, _)) = monitor_c.latest_monitors.lock().unwrap().get(&chan_2_funding) {
 950                                         monitor_c.chain_monitor.force_channel_monitor_updated(chan_2_funding, *id);
 951                                         nodes[2].process_monitor_events();
 952                                 }
 953                         },
 954
 955                         0x0c => {
 956                                 if !chan_a_disconnected {
 957                                         nodes[0].peer_disconnected(&nodes[1].get_our_node_id(), false);
 958                                         nodes[1].peer_disconnected(&nodes[0].get_our_node_id(), false);
 959                                         chan_a_disconnected = true;
 960                                         drain_msg_events_on_disconnect!(0);
 961                                 }
 962                         },
 963                         0x0d => {
 964                                 if !chan_b_disconnected {
 965                                         nodes[1].peer_disconnected(&nodes[2].get_our_node_id(), false);
 966                                         nodes[2].peer_disconnected(&nodes[1].get_our_node_id(), false);
 967                                         chan_b_disconnected = true;
 968                                         drain_msg_events_on_disconnect!(2);
 969                                 }
 970                         },
 971                         0x0e => {
 972                                 if chan_a_disconnected {
 973                                         nodes[0].peer_connected(&nodes[1].get_our_node_id(), &Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
 974                                         nodes[1].peer_connected(&nodes[0].get_our_node_id(), &Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
 975                                         chan_a_disconnected = false;
 976                                 }
 977                         },
 978                         0x0f => {
 979                                 if chan_b_disconnected {
 980                                         nodes[1].peer_connected(&nodes[2].get_our_node_id(), &Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
 981                                         nodes[2].peer_connected(&nodes[1].get_our_node_id(), &Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
 982                                         chan_b_disconnected = false;
 983                                 }
 984                         },
 985
 986                         0x10 => { process_msg_events!(0, true, ProcessMessages::AllMessages); },
 987                         0x11 => { process_msg_events!(0, false, ProcessMessages::AllMessages); },
 988                         0x12 => { process_msg_events!(0, true, ProcessMessages::OneMessage); },
 989                         0x13 => { process_msg_events!(0, false, ProcessMessages::OneMessage); },
 990                         0x14 => { process_msg_events!(0, true, ProcessMessages::OnePendingMessage); },
 991                         0x15 => { process_msg_events!(0, false, ProcessMessages::OnePendingMessage); },
 992
 993                         0x16 => { process_events!(0, true); },
 994                         0x17 => { process_events!(0, false); },
 995
 996                         0x18 => { process_msg_events!(1, true, ProcessMessages::AllMessages); },
 997                         0x19 => { process_msg_events!(1, false, ProcessMessages::AllMessages); },
 998                         0x1a => { process_msg_events!(1, true, ProcessMessages::OneMessage); },
 999                         0x1b => { process_msg_events!(1, false, ProcessMessages::OneMessage); },
1000                         0x1c => { process_msg_events!(1, true, ProcessMessages::OnePendingMessage); },
1001                         0x1d => { process_msg_events!(1, false, ProcessMessages::OnePendingMessage); },
1002
1003                         0x1e => { process_events!(1, true); },
1004                         0x1f => { process_events!(1, false); },
1005
1006                         0x20 => { process_msg_events!(2, true, ProcessMessages::AllMessages); },
1007                         0x21 => { process_msg_events!(2, false, ProcessMessages::AllMessages); },
1008                         0x22 => { process_msg_events!(2, true, ProcessMessages::OneMessage); },
1009                         0x23 => { process_msg_events!(2, false, ProcessMessages::OneMessage); },
1010                         0x24 => { process_msg_events!(2, true, ProcessMessages::OnePendingMessage); },
1011                         0x25 => { process_msg_events!(2, false, ProcessMessages::OnePendingMessage); },
1012
1013                         0x26 => { process_events!(2, true); },
1014                         0x27 => { process_events!(2, false); },
1015
1016                         0x2c => {
1017                                 if !chan_a_disconnected {
1018                                         nodes[1].peer_disconnected(&nodes[0].get_our_node_id(), false);
1019                                         chan_a_disconnected = true;
1020                                         drain_msg_events_on_disconnect!(0);
1021                                 }
1022                                 if monitor_a.should_update_manager.load(atomic::Ordering::Relaxed) {
1023                                         node_a_ser.0.clear();
1024                                         nodes[0].write(&mut node_a_ser).unwrap();
1025                                 }
1026                                 let (new_node_a, new_monitor_a) = reload_node!(node_a_ser, 0, monitor_a, keys_manager_a, fee_est_a);
1027                                 nodes[0] = new_node_a;
1028                                 monitor_a = new_monitor_a;
1029                         },
1030                         0x2d => {
1031                                 if !chan_a_disconnected {
1032                                         nodes[0].peer_disconnected(&nodes[1].get_our_node_id(), false);
1033                                         chan_a_disconnected = true;
1034                                         nodes[0].get_and_clear_pending_msg_events();
1035                                         ab_events.clear();
1036                                         ba_events.clear();
1037                                 }
1038                                 if !chan_b_disconnected {
1039                                         nodes[2].peer_disconnected(&nodes[1].get_our_node_id(), false);
1040                                         chan_b_disconnected = true;
1041                                         nodes[2].get_and_clear_pending_msg_events();
1042                                         bc_events.clear();
1043                                         cb_events.clear();
1044                                 }
1045                                 let (new_node_b, new_monitor_b) = reload_node!(node_b_ser, 1, monitor_b, keys_manager_b, fee_est_b);
1046                                 nodes[1] = new_node_b;
1047                                 monitor_b = new_monitor_b;
1048                         },
1049                         0x2e => {
1050                                 if !chan_b_disconnected {
1051                                         nodes[1].peer_disconnected(&nodes[2].get_our_node_id(), false);
1052                                         chan_b_disconnected = true;
1053                                         drain_msg_events_on_disconnect!(2);
1054                                 }
1055                                 if monitor_c.should_update_manager.load(atomic::Ordering::Relaxed) {
1056                                         node_c_ser.0.clear();
1057                                         nodes[2].write(&mut node_c_ser).unwrap();
1058                                 }
1059                                 let (new_node_c, new_monitor_c) = reload_node!(node_c_ser, 2, monitor_c, keys_manager_c, fee_est_c);
1060                                 nodes[2] = new_node_c;
1061                                 monitor_c = new_monitor_c;
1062                         },
1063
1064                         // 1/10th the channel size:
1065                         0x30 => { send_payment(&nodes[0], &nodes[1], chan_a, 10_000_000, &mut payment_id, &mut payment_idx); },
1066                         0x31 => { send_payment(&nodes[1], &nodes[0], chan_a, 10_000_000, &mut payment_id, &mut payment_idx); },
1067                         0x32 => { send_payment(&nodes[1], &nodes[2], chan_b, 10_000_000, &mut payment_id, &mut payment_idx); },
1068                         0x33 => { send_payment(&nodes[2], &nodes[1], chan_b, 10_000_000, &mut payment_id, &mut payment_idx); },
1069                         0x34 => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 10_000_000, &mut payment_id, &mut payment_idx); },
1070                         0x35 => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 10_000_000, &mut payment_id, &mut payment_idx); },
1071
1072                         0x38 => { send_payment(&nodes[0], &nodes[1], chan_a, 1_000_000, &mut payment_id, &mut payment_idx); },
1073                         0x39 => { send_payment(&nodes[1], &nodes[0], chan_a, 1_000_000, &mut payment_id, &mut payment_idx); },
1074                         0x3a => { send_payment(&nodes[1], &nodes[2], chan_b, 1_000_000, &mut payment_id, &mut payment_idx); },
1075                         0x3b => { send_payment(&nodes[2], &nodes[1], chan_b, 1_000_000, &mut payment_id, &mut payment_idx); },
1076                         0x3c => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 1_000_000, &mut payment_id, &mut payment_idx); },
1077                         0x3d => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 1_000_000, &mut payment_id, &mut payment_idx); },
1078
1079                         0x40 => { send_payment(&nodes[0], &nodes[1], chan_a, 100_000, &mut payment_id, &mut payment_idx); },
1080                         0x41 => { send_payment(&nodes[1], &nodes[0], chan_a, 100_000, &mut payment_id, &mut payment_idx); },
1081                         0x42 => { send_payment(&nodes[1], &nodes[2], chan_b, 100_000, &mut payment_id, &mut payment_idx); },
1082                         0x43 => { send_payment(&nodes[2], &nodes[1], chan_b, 100_000, &mut payment_id, &mut payment_idx); },
1083                         0x44 => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 100_000, &mut payment_id, &mut payment_idx); },
1084                         0x45 => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 100_000, &mut payment_id, &mut payment_idx); },
1085
1086                         0x48 => { send_payment(&nodes[0], &nodes[1], chan_a, 10_000, &mut payment_id, &mut payment_idx); },
1087                         0x49 => { send_payment(&nodes[1], &nodes[0], chan_a, 10_000, &mut payment_id, &mut payment_idx); },
1088                         0x4a => { send_payment(&nodes[1], &nodes[2], chan_b, 10_000, &mut payment_id, &mut payment_idx); },
1089                         0x4b => { send_payment(&nodes[2], &nodes[1], chan_b, 10_000, &mut payment_id, &mut payment_idx); },
1090                         0x4c => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 10_000, &mut payment_id, &mut payment_idx); },
1091                         0x4d => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 10_000, &mut payment_id, &mut payment_idx); },
1092
1093                         0x50 => { send_payment(&nodes[0], &nodes[1], chan_a, 1_000, &mut payment_id, &mut payment_idx); },
1094                         0x51 => { send_payment(&nodes[1], &nodes[0], chan_a, 1_000, &mut payment_id, &mut payment_idx); },
1095                         0x52 => { send_payment(&nodes[1], &nodes[2], chan_b, 1_000, &mut payment_id, &mut payment_idx); },
1096                         0x53 => { send_payment(&nodes[2], &nodes[1], chan_b, 1_000, &mut payment_id, &mut payment_idx); },
1097                         0x54 => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 1_000, &mut payment_id, &mut payment_idx); },
1098                         0x55 => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 1_000, &mut payment_id, &mut payment_idx); },
1099
1100                         0x58 => { send_payment(&nodes[0], &nodes[1], chan_a, 100, &mut payment_id, &mut payment_idx); },
1101                         0x59 => { send_payment(&nodes[1], &nodes[0], chan_a, 100, &mut payment_id, &mut payment_idx); },
1102                         0x5a => { send_payment(&nodes[1], &nodes[2], chan_b, 100, &mut payment_id, &mut payment_idx); },
1103                         0x5b => { send_payment(&nodes[2], &nodes[1], chan_b, 100, &mut payment_id, &mut payment_idx); },
1104                         0x5c => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 100, &mut payment_id, &mut payment_idx); },
1105                         0x5d => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 100, &mut payment_id, &mut payment_idx); },
1106
1107                         0x60 => { send_payment(&nodes[0], &nodes[1], chan_a, 10, &mut payment_id, &mut payment_idx); },
1108                         0x61 => { send_payment(&nodes[1], &nodes[0], chan_a, 10, &mut payment_id, &mut payment_idx); },
1109                         0x62 => { send_payment(&nodes[1], &nodes[2], chan_b, 10, &mut payment_id, &mut payment_idx); },
1110                         0x63 => { send_payment(&nodes[2], &nodes[1], chan_b, 10, &mut payment_id, &mut payment_idx); },
1111                         0x64 => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 10, &mut payment_id, &mut payment_idx); },
1112                         0x65 => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 10, &mut payment_id, &mut payment_idx); },
1113
1114                         0x68 => { send_payment(&nodes[0], &nodes[1], chan_a, 1, &mut payment_id, &mut payment_idx); },
1115                         0x69 => { send_payment(&nodes[1], &nodes[0], chan_a, 1, &mut payment_id, &mut payment_idx); },
1116                         0x6a => { send_payment(&nodes[1], &nodes[2], chan_b, 1, &mut payment_id, &mut payment_idx); },
1117                         0x6b => { send_payment(&nodes[2], &nodes[1], chan_b, 1, &mut payment_id, &mut payment_idx); },
1118                         0x6c => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 1, &mut payment_id, &mut payment_idx); },
1119                         0x6d => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 1, &mut payment_id, &mut payment_idx); },
1120
1121                         0x80 => {
1122                                 let max_feerate = last_htlc_clear_fee_a * FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE as u32;
1123                                 if fee_est_a.ret_val.fetch_add(250, atomic::Ordering::AcqRel) + 250 > max_feerate {
1124                                         fee_est_a.ret_val.store(max_feerate, atomic::Ordering::Release);
1125                                 }
1126                                 nodes[0].maybe_update_chan_fees();
1127                         },
1128                         0x81 => { fee_est_a.ret_val.store(253, atomic::Ordering::Release); nodes[0].maybe_update_chan_fees(); },
1129
1130                         0x84 => {
1131                                 let max_feerate = last_htlc_clear_fee_b * FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE as u32;
1132                                 if fee_est_b.ret_val.fetch_add(250, atomic::Ordering::AcqRel) + 250 > max_feerate {
1133                                         fee_est_b.ret_val.store(max_feerate, atomic::Ordering::Release);
1134                                 }
1135                                 nodes[1].maybe_update_chan_fees();
1136                         },
1137                         0x85 => { fee_est_b.ret_val.store(253, atomic::Ordering::Release); nodes[1].maybe_update_chan_fees(); },
1138
1139                         0x88 => {
1140                                 let max_feerate = last_htlc_clear_fee_c * FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE as u32;
1141                                 if fee_est_c.ret_val.fetch_add(250, atomic::Ordering::AcqRel) + 250 > max_feerate {
1142                                         fee_est_c.ret_val.store(max_feerate, atomic::Ordering::Release);
1143                                 }
1144                                 nodes[2].maybe_update_chan_fees();
1145                         },
1146                         0x89 => { fee_est_c.ret_val.store(253, atomic::Ordering::Release); nodes[2].maybe_update_chan_fees(); },
1147
1148                         0xff => {
1149                                 // Test that no channel is in a stuck state where neither party can send funds even
1150                                 // after we resolve all pending events.
1151                                 // First make sure there are no pending monitor updates, resetting the error state
1152                                 // and calling force_channel_monitor_updated for each monitor.
1153                                 *monitor_a.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed;
1154                                 *monitor_b.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed;
1155                                 *monitor_c.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed;
1156
1157                                 if let Some((id, _)) = monitor_a.latest_monitors.lock().unwrap().get(&chan_1_funding) {
1158                                         monitor_a.chain_monitor.force_channel_monitor_updated(chan_1_funding, *id);
1159                                         nodes[0].process_monitor_events();
1160                                 }
1161                                 if let Some((id, _)) = monitor_b.latest_monitors.lock().unwrap().get(&chan_1_funding) {
1162                                         monitor_b.chain_monitor.force_channel_monitor_updated(chan_1_funding, *id);
1163                                         nodes[1].process_monitor_events();
1164                                 }
1165                                 if let Some((id, _)) = monitor_b.latest_monitors.lock().unwrap().get(&chan_2_funding) {
1166                                         monitor_b.chain_monitor.force_channel_monitor_updated(chan_2_funding, *id);
1167                                         nodes[1].process_monitor_events();
1168                                 }
1169                                 if let Some((id, _)) = monitor_c.latest_monitors.lock().unwrap().get(&chan_2_funding) {
1170                                         monitor_c.chain_monitor.force_channel_monitor_updated(chan_2_funding, *id);
1171                                         nodes[2].process_monitor_events();
1172                                 }
1173
1174                                 // Next, make sure peers are all connected to each other
1175                                 if chan_a_disconnected {
1176                                         nodes[0].peer_connected(&nodes[1].get_our_node_id(), &Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
1177                                         nodes[1].peer_connected(&nodes[0].get_our_node_id(), &Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
1178                                         chan_a_disconnected = false;
1179                                 }
1180                                 if chan_b_disconnected {
1181                                         nodes[1].peer_connected(&nodes[2].get_our_node_id(), &Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
1182                                         nodes[2].peer_connected(&nodes[1].get_our_node_id(), &Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
1183                                         chan_b_disconnected = false;
1184                                 }
1185
1186                                 for i in 0..std::usize::MAX {
1187                                         if i == 100 { panic!("It may take may iterations to settle the state, but it should not take forever"); }
1188                                         // Then, make sure any current forwards make their way to their destination
1189                                         if process_msg_events!(0, false, ProcessMessages::AllMessages) { continue; }
1190                                         if process_msg_events!(1, false, ProcessMessages::AllMessages) { continue; }
1191                                         if process_msg_events!(2, false, ProcessMessages::AllMessages) { continue; }
1192                                         // ...making sure any pending PendingHTLCsForwardable events are handled and
1193                                         // payments claimed.
1194                                         if process_events!(0, false) { continue; }
1195                                         if process_events!(1, false) { continue; }
1196                                         if process_events!(2, false) { continue; }
1197                                         break;
1198                                 }
1199
1200                                 // Finally, make sure that at least one end of each channel can make a substantial payment
1201                                 assert!(
1202                                         send_payment(&nodes[0], &nodes[1], chan_a, 10_000_000, &mut payment_id, &mut payment_idx) ||
1203                                         send_payment(&nodes[1], &nodes[0], chan_a, 10_000_000, &mut payment_id, &mut payment_idx));
1204                                 assert!(
1205                                         send_payment(&nodes[1], &nodes[2], chan_b, 10_000_000, &mut payment_id, &mut payment_idx) ||
1206                                         send_payment(&nodes[2], &nodes[1], chan_b, 10_000_000, &mut payment_id, &mut payment_idx));
1207
1208                                 last_htlc_clear_fee_a = fee_est_a.ret_val.load(atomic::Ordering::Acquire);
1209                                 last_htlc_clear_fee_b = fee_est_b.ret_val.load(atomic::Ordering::Acquire);
1210                                 last_htlc_clear_fee_c = fee_est_c.ret_val.load(atomic::Ordering::Acquire);
1211                         },
1212                         _ => test_return!(),
1213                 }
1214
1215                 node_a_ser.0.clear();
1216                 nodes[0].write(&mut node_a_ser).unwrap();
1217                 monitor_a.should_update_manager.store(false, atomic::Ordering::Relaxed);
1218                 node_b_ser.0.clear();
1219                 nodes[1].write(&mut node_b_ser).unwrap();
1220                 monitor_b.should_update_manager.store(false, atomic::Ordering::Relaxed);
1221                 node_c_ser.0.clear();
1222                 nodes[2].write(&mut node_c_ser).unwrap();
1223                 monitor_c.should_update_manager.store(false, atomic::Ordering::Relaxed);
1224         }
1225 }
1226
1227 /// We actually have different behavior based on if a certain log string has been seen, so we have
1228 /// to do a bit more tracking.
1229 #[derive(Clone)]
1230 struct SearchingOutput<O: Output> {
1231         output: O,
1232         may_fail: Arc<atomic::AtomicBool>,
1233 }
1234 impl<O: Output> Output for SearchingOutput<O> {
1235         fn locked_write(&self, data: &[u8]) {
1236                 // We hit a design limitation of LN state machine (see CONCURRENT_INBOUND_HTLC_FEE_BUFFER)
1237                 if std::str::from_utf8(data).unwrap().contains("Outbound update_fee HTLC buffer overflow - counterparty should force-close this channel") {
1238                         self.may_fail.store(true, atomic::Ordering::Release);
1239                 }
1240                 self.output.locked_write(data)
1241         }
1242 }
1243 impl<O: Output> SearchingOutput<O> {
1244         pub fn new(output: O) -> Self {
1245                 Self { output, may_fail: Arc::new(atomic::AtomicBool::new(false)) }
1246         }
1247 }
1248
1249 pub fn chanmon_consistency_test<Out: Output>(data: &[u8], out: Out) {
1250         do_test(data, out);
1251 }
1252
1253 #[no_mangle]
1254 pub extern "C" fn chanmon_consistency_run(data: *const u8, datalen: usize) {
1255         do_test(unsafe { std::slice::from_raw_parts(data, datalen) }, test_logger::DevNull{});
1256 }