_ Git - rust-lightning/blob - lightning-invoice/src/utils.rs

   1 //! Convenient utilities to create an invoice.
   2
   3 use {CreationError, Currency, Invoice, InvoiceBuilder, SignOrCreationError};
   4 use payment::{InFlightHtlcs, Payer, Router};
   5
   6 use crate::{prelude::*, Description, InvoiceDescription, Sha256};
   7 use bech32::ToBase32;
   8 use bitcoin_hashes::{Hash, sha256};
   9 use lightning::chain;
  10 use lightning::chain::chaininterface::{BroadcasterInterface, FeeEstimator};
  11 use lightning::chain::keysinterface::{Recipient, KeysInterface, Sign};
  12 use lightning::ln::{PaymentHash, PaymentPreimage, PaymentSecret};
  13 use lightning::ln::channelmanager::{ChannelDetails, ChannelManager, PaymentId, PaymentSendFailure, MIN_FINAL_CLTV_EXPIRY};
  14 #[cfg(feature = "std")]
  15 use lightning::ln::channelmanager::{PhantomRouteHints, MIN_CLTV_EXPIRY_DELTA};
  16 use lightning::ln::inbound_payment::{create, create_from_hash, ExpandedKey};
  17 use lightning::ln::msgs::LightningError;
  18 use lightning::routing::gossip::{NetworkGraph, NodeId, RoutingFees};
  19 use lightning::routing::router::{Route, RouteHint, RouteHintHop, RouteParameters, find_route, RouteHop};
  20 use lightning::routing::scoring::{ChannelUsage, LockableScore, Score};
  21 use lightning::util::logger::Logger;
  22 use secp256k1::PublicKey;
  23 use core::ops::Deref;
  24 use core::time::Duration;
  25 use sync::Mutex;
  26
  27 #[cfg(feature = "std")]
  28 /// Utility to create an invoice that can be paid to one of multiple nodes, or a "phantom invoice."
  29 /// See [`PhantomKeysManager`] for more information on phantom node payments.
  30 ///
  31 /// `phantom_route_hints` parameter:
  32 /// * Contains channel info for all nodes participating in the phantom invoice
  33 /// * Entries are retrieved from a call to [`ChannelManager::get_phantom_route_hints`] on each
  34 ///   participating node
  35 /// * It is fine to cache `phantom_route_hints` and reuse it across invoices, as long as the data is
  36 ///   updated when a channel becomes disabled or closes
  37 /// * Note that if too many channels are included in [`PhantomRouteHints::channels`], the invoice
  38 ///   may be too long for QR code scanning. To fix this, `PhantomRouteHints::channels` may be pared
  39 ///   down
  40 ///
  41 /// `payment_hash` can be specified if you have a specific need for a custom payment hash (see the difference
  42 /// between [`ChannelManager::create_inbound_payment`] and [`ChannelManager::create_inbound_payment_for_hash`]).
  43 /// If `None` is provided for `payment_hash`, then one will be created.
  44 ///
  45 /// `invoice_expiry_delta_secs` describes the number of seconds that the invoice is valid for
  46 /// in excess of the current time.
  47 ///
  48 /// Note that the provided `keys_manager`'s `KeysInterface` implementation must support phantom
  49 /// invoices in its `sign_invoice` implementation ([`PhantomKeysManager`] satisfies this
  50 /// requirement).
  51 ///
  52 /// [`PhantomKeysManager`]: lightning::chain::keysinterface::PhantomKeysManager
  53 /// [`ChannelManager::get_phantom_route_hints`]: lightning::ln::channelmanager::ChannelManager::get_phantom_route_hints
  54 /// [`ChannelManager::create_inbound_payment`]: lightning::ln::channelmanager::ChannelManager::create_inbound_payment
  55 /// [`ChannelManager::create_inbound_payment_for_hash`]: lightning::ln::channelmanager::ChannelManager::create_inbound_payment_for_hash
  56 /// [`PhantomRouteHints::channels`]: lightning::ln::channelmanager::PhantomRouteHints::channels
  57 pub fn create_phantom_invoice<Signer: Sign, K: Deref>(
  58         amt_msat: Option<u64>, payment_hash: Option<PaymentHash>, description: String, invoice_expiry_delta_secs: u32,
  59         phantom_route_hints: Vec<PhantomRouteHints>, keys_manager: K, network: Currency,
  60 ) -> Result<Invoice, SignOrCreationError<()>> where K::Target: KeysInterface {
  61         let description = Description::new(description).map_err(SignOrCreationError::CreationError)?;
  62         let description = InvoiceDescription::Direct(&description,);
  63         _create_phantom_invoice::<Signer, K>(
  64                 amt_msat, payment_hash, description, invoice_expiry_delta_secs, phantom_route_hints, keys_manager, network,
  65         )
  66 }
  67
  68 #[cfg(feature = "std")]
  69 /// Utility to create an invoice that can be paid to one of multiple nodes, or a "phantom invoice."
  70 /// See [`PhantomKeysManager`] for more information on phantom node payments.
  71 ///
  72 /// `phantom_route_hints` parameter:
  73 /// * Contains channel info for all nodes participating in the phantom invoice
  74 /// * Entries are retrieved from a call to [`ChannelManager::get_phantom_route_hints`] on each
  75 ///   participating node
  76 /// * It is fine to cache `phantom_route_hints` and reuse it across invoices, as long as the data is
  77 ///   updated when a channel becomes disabled or closes
  78 /// * Note that if too many channels are included in [`PhantomRouteHints::channels`], the invoice
  79 ///   may be too long for QR code scanning. To fix this, `PhantomRouteHints::channels` may be pared
  80 ///   down
  81 ///
  82 /// `description_hash` is a SHA-256 hash of the description text
  83 ///
  84 /// `payment_hash` can be specified if you have a specific need for a custom payment hash (see the difference
  85 /// between [`ChannelManager::create_inbound_payment`] and [`ChannelManager::create_inbound_payment_for_hash`]).
  86 /// If `None` is provided for `payment_hash`, then one will be created.
  87 ///
  88 /// `invoice_expiry_delta_secs` describes the number of seconds that the invoice is valid for
  89 /// in excess of the current time.
  90 ///
  91 /// Note that the provided `keys_manager`'s `KeysInterface` implementation must support phantom
  92 /// invoices in its `sign_invoice` implementation ([`PhantomKeysManager`] satisfies this
  93 /// requirement).
  94 ///
  95 /// [`PhantomKeysManager`]: lightning::chain::keysinterface::PhantomKeysManager
  96 /// [`ChannelManager::get_phantom_route_hints`]: lightning::ln::channelmanager::ChannelManager::get_phantom_route_hints
  97 /// [`ChannelManager::create_inbound_payment`]: lightning::ln::channelmanager::ChannelManager::create_inbound_payment
  98 /// [`ChannelManager::create_inbound_payment_for_hash`]: lightning::ln::channelmanager::ChannelManager::create_inbound_payment_for_hash
  99 /// [`PhantomRouteHints::channels`]: lightning::ln::channelmanager::PhantomRouteHints::channels
 100 pub fn create_phantom_invoice_with_description_hash<Signer: Sign, K: Deref>(
 101         amt_msat: Option<u64>, payment_hash: Option<PaymentHash>, invoice_expiry_delta_secs: u32,
 102         description_hash: Sha256, phantom_route_hints: Vec<PhantomRouteHints>, keys_manager: K, network: Currency,
 103 ) -> Result<Invoice, SignOrCreationError<()>> where K::Target: KeysInterface
 104 {
 105         _create_phantom_invoice::<Signer, K>(
 106                 amt_msat, payment_hash, InvoiceDescription::Hash(&description_hash),
 107                 invoice_expiry_delta_secs, phantom_route_hints, keys_manager, network,
 108         )
 109 }
 110
 111 #[cfg(feature = "std")]
 112 fn _create_phantom_invoice<Signer: Sign, K: Deref>(
 113         amt_msat: Option<u64>, payment_hash: Option<PaymentHash>, description: InvoiceDescription,
 114         invoice_expiry_delta_secs: u32, phantom_route_hints: Vec<PhantomRouteHints>, keys_manager: K, network: Currency,
 115 ) -> Result<Invoice, SignOrCreationError<()>> where K::Target: KeysInterface
 116 {
 117         use std::time::{SystemTime, UNIX_EPOCH};
 118
 119         if phantom_route_hints.len() == 0 {
 120                 return Err(SignOrCreationError::CreationError(
 121                         CreationError::MissingRouteHints,
 122                 ));
 123         }
 124         let invoice = match description {
 125                 InvoiceDescription::Direct(description) => {
 126                         InvoiceBuilder::new(network).description(description.0.clone())
 127                 }
 128                 InvoiceDescription::Hash(hash) => InvoiceBuilder::new(network).description_hash(hash.0),
 129         };
 130
 131         // If we ever see performance here being too slow then we should probably take this ExpandedKey as a parameter instead.
 132         let keys = ExpandedKey::new(&keys_manager.get_inbound_payment_key_material());
 133         let (payment_hash, payment_secret) = if let Some(payment_hash) = payment_hash {
 134                 let payment_secret = create_from_hash(
 135                         &keys,
 136                         amt_msat,
 137                         payment_hash,
 138                         invoice_expiry_delta_secs,
 139                         SystemTime::now()
 140                                 .duration_since(UNIX_EPOCH)
 141                                 .expect("Time must be > 1970")
 142                                 .as_secs(),
 143                 )
 144                 .map_err(|_| SignOrCreationError::CreationError(CreationError::InvalidAmount))?;
 145                 (payment_hash, payment_secret)
 146         } else {
 147                 create(
 148                         &keys,
 149                         amt_msat,
 150                         invoice_expiry_delta_secs,
 151                         &keys_manager,
 152                         SystemTime::now()
 153                                 .duration_since(UNIX_EPOCH)
 154                                 .expect("Time must be > 1970")
 155                                 .as_secs(),
 156                 )
 157                 .map_err(|_| SignOrCreationError::CreationError(CreationError::InvalidAmount))?
 158         };
 159
 160         let mut invoice = invoice
 161                 .current_timestamp()
 162                 .payment_hash(Hash::from_slice(&payment_hash.0).unwrap())
 163                 .payment_secret(payment_secret)
 164                 .min_final_cltv_expiry(MIN_FINAL_CLTV_EXPIRY.into())
 165                 .expiry_time(Duration::from_secs(invoice_expiry_delta_secs.into()));
 166         if let Some(amt) = amt_msat {
 167                 invoice = invoice.amount_milli_satoshis(amt);
 168         }
 169
 170         for PhantomRouteHints { channels, phantom_scid, real_node_pubkey } in phantom_route_hints {
 171                 let mut route_hints = filter_channels(channels, amt_msat);
 172
 173                 // If we have any public channel, the route hints from `filter_channels` will be empty.
 174                 // In that case we create a RouteHint on which we will push a single hop with the phantom
 175                 // route into the invoice, and let the sender find the path to the `real_node_pubkey`
 176                 // node by looking at our public channels.
 177                 if route_hints.is_empty() {
 178                         route_hints.push(RouteHint(vec![]))
 179                 }
 180                 for mut route_hint in route_hints {
 181                         route_hint.0.push(RouteHintHop {
 182                                 src_node_id: real_node_pubkey,
 183                                 short_channel_id: phantom_scid,
 184                                 fees: RoutingFees {
 185                                         base_msat: 0,
 186                                         proportional_millionths: 0,
 187                                 },
 188                                 cltv_expiry_delta: MIN_CLTV_EXPIRY_DELTA,
 189                                 htlc_minimum_msat: None,
 190                                 htlc_maximum_msat: None,});
 191                         invoice = invoice.private_route(route_hint.clone());
 192                 }
 193         }
 194
 195         let raw_invoice = match invoice.build_raw() {
 196                 Ok(inv) => inv,
 197                 Err(e) => return Err(SignOrCreationError::CreationError(e))
 198         };
 199         let hrp_str = raw_invoice.hrp.to_string();
 200         let hrp_bytes = hrp_str.as_bytes();
 201         let data_without_signature = raw_invoice.data.to_base32();
 202         let signed_raw_invoice = raw_invoice.sign(|_| keys_manager.sign_invoice(hrp_bytes, &data_without_signature, Recipient::PhantomNode));
 203         match signed_raw_invoice {
 204                 Ok(inv) => Ok(Invoice::from_signed(inv).unwrap()),
 205                 Err(e) => Err(SignOrCreationError::SignError(e))
 206         }
 207 }
 208
 209 #[cfg(feature = "std")]
 210 /// Utility to construct an invoice. Generally, unless you want to do something like a custom
 211 /// cltv_expiry, this is what you should be using to create an invoice. The reason being, this
 212 /// method stores the invoice's payment secret and preimage in `ChannelManager`, so (a) the user
 213 /// doesn't have to store preimage/payment secret information and (b) `ChannelManager` can verify
 214 /// that the payment secret is valid when the invoice is paid.
 215 ///
 216 /// `invoice_expiry_delta_secs` describes the number of seconds that the invoice is valid for
 217 /// in excess of the current time.
 218 pub fn create_invoice_from_channelmanager<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>(
 219         channelmanager: &ChannelManager<Signer, M, T, K, F, L>, keys_manager: K, network: Currency,
 220         amt_msat: Option<u64>, description: String, invoice_expiry_delta_secs: u32
 221 ) -> Result<Invoice, SignOrCreationError<()>>
 222 where
 223         M::Target: chain::Watch<Signer>,
 224         T::Target: BroadcasterInterface,
 225         K::Target: KeysInterface<Signer = Signer>,
 226         F::Target: FeeEstimator,
 227         L::Target: Logger,
 228 {
 229         use std::time::SystemTime;
 230         let duration = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH)
 231                 .expect("for the foreseeable future this shouldn't happen");
 232         create_invoice_from_channelmanager_and_duration_since_epoch(
 233                 channelmanager, keys_manager, network, amt_msat, description, duration,
 234                 invoice_expiry_delta_secs
 235         )
 236 }
 237
 238 #[cfg(feature = "std")]
 239 /// Utility to construct an invoice. Generally, unless you want to do something like a custom
 240 /// cltv_expiry, this is what you should be using to create an invoice. The reason being, this
 241 /// method stores the invoice's payment secret and preimage in `ChannelManager`, so (a) the user
 242 /// doesn't have to store preimage/payment secret information and (b) `ChannelManager` can verify
 243 /// that the payment secret is valid when the invoice is paid.
 244 /// Use this variant if you want to pass the `description_hash` to the invoice.
 245 ///
 246 /// `invoice_expiry_delta_secs` describes the number of seconds that the invoice is valid for
 247 /// in excess of the current time.
 248 pub fn create_invoice_from_channelmanager_with_description_hash<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>(
 249         channelmanager: &ChannelManager<Signer, M, T, K, F, L>, keys_manager: K, network: Currency,
 250         amt_msat: Option<u64>, description_hash: Sha256, invoice_expiry_delta_secs: u32
 251 ) -> Result<Invoice, SignOrCreationError<()>>
 252 where
 253         M::Target: chain::Watch<Signer>,
 254         T::Target: BroadcasterInterface,
 255         K::Target: KeysInterface<Signer = Signer>,
 256         F::Target: FeeEstimator,
 257         L::Target: Logger,
 258 {
 259         use std::time::SystemTime;
 260
 261         let duration = SystemTime::now()
 262                 .duration_since(SystemTime::UNIX_EPOCH)
 263                 .expect("for the foreseeable future this shouldn't happen");
 264
 265         create_invoice_from_channelmanager_with_description_hash_and_duration_since_epoch(
 266                 channelmanager, keys_manager, network, amt_msat,
 267                 description_hash, duration, invoice_expiry_delta_secs
 268         )
 269 }
 270
 271 /// See [`create_invoice_from_channelmanager_with_description_hash`]
 272 /// This version can be used in a `no_std` environment, where [`std::time::SystemTime`] is not
 273 /// available and the current time is supplied by the caller.
 274 pub fn create_invoice_from_channelmanager_with_description_hash_and_duration_since_epoch<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>(
 275         channelmanager: &ChannelManager<Signer, M, T, K, F, L>, keys_manager: K, network: Currency,
 276         amt_msat: Option<u64>, description_hash: Sha256, duration_since_epoch: Duration,
 277         invoice_expiry_delta_secs: u32
 278 ) -> Result<Invoice, SignOrCreationError<()>>
 279 where
 280         M::Target: chain::Watch<Signer>,
 281         T::Target: BroadcasterInterface,
 282         K::Target: KeysInterface<Signer = Signer>,
 283         F::Target: FeeEstimator,
 284         L::Target: Logger,
 285 {
 286         _create_invoice_from_channelmanager_and_duration_since_epoch(
 287                 channelmanager, keys_manager, network, amt_msat,
 288                 InvoiceDescription::Hash(&description_hash),
 289                 duration_since_epoch, invoice_expiry_delta_secs
 290         )
 291 }
 292
 293 /// See [`create_invoice_from_channelmanager`]
 294 /// This version can be used in a `no_std` environment, where [`std::time::SystemTime`] is not
 295 /// available and the current time is supplied by the caller.
 296 pub fn create_invoice_from_channelmanager_and_duration_since_epoch<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>(
 297         channelmanager: &ChannelManager<Signer, M, T, K, F, L>, keys_manager: K, network: Currency,
 298         amt_msat: Option<u64>, description: String, duration_since_epoch: Duration,
 299         invoice_expiry_delta_secs: u32
 300 ) -> Result<Invoice, SignOrCreationError<()>>
 301 where
 302         M::Target: chain::Watch<Signer>,
 303         T::Target: BroadcasterInterface,
 304         K::Target: KeysInterface<Signer = Signer>,
 305         F::Target: FeeEstimator,
 306         L::Target: Logger,
 307 {
 308         _create_invoice_from_channelmanager_and_duration_since_epoch(
 309                 channelmanager, keys_manager, network, amt_msat,
 310                 InvoiceDescription::Direct(
 311                         &Description::new(description).map_err(SignOrCreationError::CreationError)?,
 312                 ),
 313                 duration_since_epoch, invoice_expiry_delta_secs
 314         )
 315 }
 316
 317 fn _create_invoice_from_channelmanager_and_duration_since_epoch<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>(
 318         channelmanager: &ChannelManager<Signer, M, T, K, F, L>, keys_manager: K, network: Currency,
 319         amt_msat: Option<u64>, description: InvoiceDescription, duration_since_epoch: Duration,
 320         invoice_expiry_delta_secs: u32
 321 ) -> Result<Invoice, SignOrCreationError<()>>
 322 where
 323         M::Target: chain::Watch<Signer>,
 324         T::Target: BroadcasterInterface,
 325         K::Target: KeysInterface<Signer = Signer>,
 326         F::Target: FeeEstimator,
 327         L::Target: Logger,
 328 {
 329         let route_hints = filter_channels(channelmanager.list_channels(), amt_msat);
 330
 331         // `create_inbound_payment` only returns an error if the amount is greater than the total bitcoin
 332         // supply.
 333         let (payment_hash, payment_secret) = channelmanager
 334                 .create_inbound_payment(amt_msat, invoice_expiry_delta_secs)
 335                 .map_err(|()| SignOrCreationError::CreationError(CreationError::InvalidAmount))?;
 336         let our_node_pubkey = channelmanager.get_our_node_id();
 337
 338         let invoice = match description {
 339                 InvoiceDescription::Direct(description) => {
 340                         InvoiceBuilder::new(network).description(description.0.clone())
 341                 }
 342                 InvoiceDescription::Hash(hash) => InvoiceBuilder::new(network).description_hash(hash.0),
 343         };
 344
 345         let mut invoice = invoice
 346                 .duration_since_epoch(duration_since_epoch)
 347                 .payee_pub_key(our_node_pubkey)
 348                 .payment_hash(Hash::from_slice(&payment_hash.0).unwrap())
 349                 .payment_secret(payment_secret)
 350                 .basic_mpp()
 351                 .min_final_cltv_expiry(MIN_FINAL_CLTV_EXPIRY.into())
 352                 .expiry_time(Duration::from_secs(invoice_expiry_delta_secs.into()));
 353         if let Some(amt) = amt_msat {
 354                 invoice = invoice.amount_milli_satoshis(amt);
 355         }
 356         for hint in route_hints {
 357                 invoice = invoice.private_route(hint);
 358         }
 359
 360         let raw_invoice = match invoice.build_raw() {
 361                 Ok(inv) => inv,
 362                 Err(e) => return Err(SignOrCreationError::CreationError(e))
 363         };
 364         let hrp_str = raw_invoice.hrp.to_string();
 365         let hrp_bytes = hrp_str.as_bytes();
 366         let data_without_signature = raw_invoice.data.to_base32();
 367         let signed_raw_invoice = raw_invoice.sign(|_| keys_manager.sign_invoice(hrp_bytes, &data_without_signature, Recipient::Node));
 368         match signed_raw_invoice {
 369                 Ok(inv) => Ok(Invoice::from_signed(inv).unwrap()),
 370                 Err(e) => Err(SignOrCreationError::SignError(e))
 371         }
 372 }
 373
 374 /// Filters the `channels` for an invoice, and returns the corresponding `RouteHint`s to include
 375 /// in the invoice.
 376 ///
 377 /// The filtering is based on the following criteria:
 378 /// * Only one channel per counterparty node
 379 /// * Always select the channel with the highest inbound capacity per counterparty node
 380 /// * Prefer channels with capacity at least `min_inbound_capacity_msat` and where the channel
 381 ///   `is_usable` (i.e. the peer is connected).
 382 /// * If any public channel exists, the returned `RouteHint`s will be empty, and the sender will
 383 ///   need to find the path by looking at the public channels instead
 384 fn filter_channels(channels: Vec<ChannelDetails>, min_inbound_capacity_msat: Option<u64>) -> Vec<RouteHint>{
 385         let mut filtered_channels: HashMap<PublicKey, ChannelDetails> = HashMap::new();
 386         let min_inbound_capacity = min_inbound_capacity_msat.unwrap_or(0);
 387         let mut min_capacity_channel_exists = false;
 388         let mut online_channel_exists = false;
 389         let mut online_min_capacity_channel_exists = false;
 390
 391         for channel in channels.into_iter().filter(|chan| chan.is_channel_ready) {
 392                 if channel.get_inbound_payment_scid().is_none() || channel.counterparty.forwarding_info.is_none() {
 393                         continue;
 394                 }
 395
 396                 if channel.is_public {
 397                         // If any public channel exists, return no hints and let the sender
 398                         // look at the public channels instead.
 399                         return vec![]
 400                 }
 401
 402                 if channel.inbound_capacity_msat >= min_inbound_capacity {
 403                         min_capacity_channel_exists = true;
 404                         if channel.is_usable {
 405                                 online_min_capacity_channel_exists = true;
 406                         }
 407                 }
 408                 if channel.is_usable {
 409                         online_channel_exists = true;
 410                 }
 411                 match filtered_channels.entry(channel.counterparty.node_id) {
 412                         hash_map::Entry::Occupied(mut entry) => {
 413                                 let current_max_capacity = entry.get().inbound_capacity_msat;
 414                                 if channel.inbound_capacity_msat < current_max_capacity {
 415                                         continue;
 416                                 }
 417                                 entry.insert(channel);
 418                         }
 419                         hash_map::Entry::Vacant(entry) => {
 420                                 entry.insert(channel);
 421                         }
 422                 }
 423         }
 424
 425         let route_hint_from_channel = |channel: ChannelDetails| {
 426                 let forwarding_info = channel.counterparty.forwarding_info.as_ref().unwrap();
 427                 RouteHint(vec![RouteHintHop {
 428                         src_node_id: channel.counterparty.node_id,
 429                         short_channel_id: channel.get_inbound_payment_scid().unwrap(),
 430                         fees: RoutingFees {
 431                                 base_msat: forwarding_info.fee_base_msat,
 432                                 proportional_millionths: forwarding_info.fee_proportional_millionths,
 433                         },
 434                         cltv_expiry_delta: forwarding_info.cltv_expiry_delta,
 435                         htlc_minimum_msat: channel.inbound_htlc_minimum_msat,
 436                         htlc_maximum_msat: channel.inbound_htlc_maximum_msat,}])
 437         };
 438         // If all channels are private, prefer to return route hints which have a higher capacity than
 439         // the payment value and where we're currently connected to the channel counterparty.
 440         // Even if we cannot satisfy both goals, always ensure we include *some* hints, preferring
 441         // those which meet at least one criteria.
 442         filtered_channels
 443                 .into_iter()
 444                 .map(|(_, channel)| channel)
 445                 .filter(|channel| {
 446                         if online_min_capacity_channel_exists {
 447                                 channel.inbound_capacity_msat >= min_inbound_capacity && channel.is_usable
 448                         } else if min_capacity_channel_exists && online_channel_exists {
 449                                 // If there are some online channels and some min_capacity channels, but no
 450                                 // online-and-min_capacity channels, just include the min capacity ones and ignore
 451                                 // online-ness.
 452                                 channel.inbound_capacity_msat >= min_inbound_capacity
 453                         } else if min_capacity_channel_exists {
 454                                 channel.inbound_capacity_msat >= min_inbound_capacity
 455                         } else if online_channel_exists {
 456                                 channel.is_usable
 457                         } else { true }
 458                 })
 459                 .map(route_hint_from_channel)
 460                 .collect::<Vec<RouteHint>>()
 461 }
 462
 463 /// A [`Router`] implemented using [`find_route`].
 464 pub struct DefaultRouter<G: Deref<Target = NetworkGraph<L>>, L: Deref, S: Deref> where
 465         L::Target: Logger,
 466         S::Target: for <'a> LockableScore<'a>,
 467 {
 468         network_graph: G,
 469         logger: L,
 470         random_seed_bytes: Mutex<[u8; 32]>,
 471         scorer: S
 472 }
 473
 474 impl<G: Deref<Target = NetworkGraph<L>>, L: Deref, S: Deref> DefaultRouter<G, L, S> where
 475         L::Target: Logger,
 476         S::Target: for <'a> LockableScore<'a>,
 477 {
 478         /// Creates a new router using the given [`NetworkGraph`], a [`Logger`], and a randomness source
 479         /// `random_seed_bytes`.
 480         pub fn new(network_graph: G, logger: L, random_seed_bytes: [u8; 32], scorer: S) -> Self {
 481                 let random_seed_bytes = Mutex::new(random_seed_bytes);
 482                 Self { network_graph, logger, random_seed_bytes, scorer }
 483         }
 484 }
 485
 486 impl<G: Deref<Target = NetworkGraph<L>>, L: Deref, S: Deref> Router for DefaultRouter<G, L, S> where
 487         L::Target: Logger,
 488         S::Target: for <'a> LockableScore<'a>,
 489 {
 490         fn find_route(
 491                 &self, payer: &PublicKey, params: &RouteParameters, _payment_hash: &PaymentHash,
 492                 first_hops: Option<&[&ChannelDetails]>, inflight_htlcs: InFlightHtlcs
 493         ) -> Result<Route, LightningError> {
 494                 let random_seed_bytes = {
 495                         let mut locked_random_seed_bytes = self.random_seed_bytes.lock().unwrap();
 496                         *locked_random_seed_bytes = sha256::Hash::hash(&*locked_random_seed_bytes).into_inner();
 497                         *locked_random_seed_bytes
 498                 };
 499
 500                 find_route(
 501                         payer, params, &self.network_graph, first_hops, &*self.logger,
 502                         &ScorerAccountingForInFlightHtlcs::new(&mut self.scorer.lock(), inflight_htlcs),
 503                         &random_seed_bytes
 504                 )
 505         }
 506
 507         fn notify_payment_path_failed(&self, path: &[&RouteHop], short_channel_id: u64) {
 508                 self.scorer.lock().payment_path_failed(path, short_channel_id);
 509         }
 510
 511         fn notify_payment_path_successful(&self, path: &[&RouteHop]) {
 512                 self.scorer.lock().payment_path_successful(path);
 513         }
 514
 515         fn notify_payment_probe_successful(&self, path: &[&RouteHop]) {
 516                 self.scorer.lock().probe_successful(path);
 517         }
 518
 519         fn notify_payment_probe_failed(&self, path: &[&RouteHop], short_channel_id: u64) {
 520                 self.scorer.lock().probe_failed(path, short_channel_id);
 521         }
 522 }
 523
 524 impl<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> Payer for ChannelManager<Signer, M, T, K, F, L>
 525 where
 526         M::Target: chain::Watch<Signer>,
 527         T::Target: BroadcasterInterface,
 528         K::Target: KeysInterface<Signer = Signer>,
 529         F::Target: FeeEstimator,
 530         L::Target: Logger,
 531 {
 532         fn node_id(&self) -> PublicKey {
 533                 self.get_our_node_id()
 534         }
 535
 536         fn first_hops(&self) -> Vec<ChannelDetails> {
 537                 self.list_usable_channels()
 538         }
 539
 540         fn send_payment(
 541                 &self, route: &Route, payment_hash: PaymentHash, payment_secret: &Option<PaymentSecret>
 542         ) -> Result<PaymentId, PaymentSendFailure> {
 543                 self.send_payment(route, payment_hash, payment_secret)
 544         }
 545
 546         fn send_spontaneous_payment(
 547                 &self, route: &Route, payment_preimage: PaymentPreimage,
 548         ) -> Result<PaymentId, PaymentSendFailure> {
 549                 self.send_spontaneous_payment(route, Some(payment_preimage))
 550                         .map(|(_, payment_id)| payment_id)
 551         }
 552
 553         fn retry_payment(
 554                 &self, route: &Route, payment_id: PaymentId
 555         ) -> Result<(), PaymentSendFailure> {
 556                 self.retry_payment(route, payment_id)
 557         }
 558
 559         fn abandon_payment(&self, payment_id: PaymentId) {
 560                 self.abandon_payment(payment_id)
 561         }
 562 }
 563
 564
 565 /// Used to store information about all the HTLCs that are inflight across all payment attempts.
 566 pub(crate) struct ScorerAccountingForInFlightHtlcs<'a, S: Score> {
 567         scorer: &'a mut S,
 568         /// Maps a channel's short channel id and its direction to the liquidity used up.
 569         inflight_htlcs: InFlightHtlcs,
 570 }
 571
 572 impl<'a, S: Score> ScorerAccountingForInFlightHtlcs<'a, S> {
 573         pub(crate) fn new(scorer: &'a mut S, inflight_htlcs: InFlightHtlcs) -> Self {
 574                 ScorerAccountingForInFlightHtlcs {
 575                         scorer,
 576                         inflight_htlcs
 577                 }
 578         }
 579 }
 580
 581 #[cfg(c_bindings)]
 582 impl<'a, S:Score> lightning::util::ser::Writeable for ScorerAccountingForInFlightHtlcs<'a, S> {
 583         fn write<W: lightning::util::ser::Writer>(&self, writer: &mut W) -> Result<(), lightning::io::Error> { self.scorer.write(writer) }
 584 }
 585
 586 impl<'a, S: Score> Score for ScorerAccountingForInFlightHtlcs<'a, S> {
 587         fn channel_penalty_msat(&self, short_channel_id: u64, source: &NodeId, target: &NodeId, usage: ChannelUsage) -> u64 {
 588                 if let Some(used_liqudity) = self.inflight_htlcs.used_liquidity_msat(
 589                         source, target, short_channel_id
 590                 ) {
 591                         let usage = ChannelUsage {
 592                                 inflight_htlc_msat: usage.inflight_htlc_msat + used_liqudity,
 593                                 ..usage
 594                         };
 595
 596                         self.scorer.channel_penalty_msat(short_channel_id, source, target, usage)
 597                 } else {
 598                         self.scorer.channel_penalty_msat(short_channel_id, source, target, usage)
 599                 }
 600         }
 601
 602         fn payment_path_failed(&mut self, _path: &[&RouteHop], _short_channel_id: u64) { unreachable!() }
 603
 604         fn payment_path_successful(&mut self, _path: &[&RouteHop]) { unreachable!() }
 605
 606         fn probe_failed(&mut self, _path: &[&RouteHop], _short_channel_id: u64) { unreachable!() }
 607
 608         fn probe_successful(&mut self, _path: &[&RouteHop]) { unreachable!() }
 609 }
 610
 611
 612 #[cfg(test)]
 613 mod test {
 614         use core::time::Duration;
 615         use {Currency, Description, InvoiceDescription};
 616         use bitcoin_hashes::Hash;
 617         use bitcoin_hashes::sha256::Hash as Sha256;
 618         use lightning::chain::keysinterface::PhantomKeysManager;
 619         use lightning::ln::{PaymentPreimage, PaymentHash};
 620         use lightning::ln::channelmanager::{self, PhantomRouteHints, MIN_FINAL_CLTV_EXPIRY};
 621         use lightning::ln::functional_test_utils::*;
 622         use lightning::ln::msgs::ChannelMessageHandler;
 623         use lightning::routing::router::{PaymentParameters, RouteParameters, find_route};
 624         use lightning::util::enforcing_trait_impls::EnforcingSigner;
 625         use lightning::util::events::{MessageSendEvent, MessageSendEventsProvider, Event};
 626         use lightning::util::test_utils;
 627         use lightning::util::config::UserConfig;
 628         use lightning::chain::keysinterface::KeysInterface;
 629         use utils::create_invoice_from_channelmanager_and_duration_since_epoch;
 630         use std::collections::HashSet;
 631
 632         #[test]
 633         fn test_from_channelmanager() {
 634                 let chanmon_cfgs = create_chanmon_cfgs(2);
 635                 let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
 636                 let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
 637                 let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
 638                 create_unannounced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
 639                 let non_default_invoice_expiry_secs = 4200;
 640                 let invoice = create_invoice_from_channelmanager_and_duration_since_epoch(
 641                         &nodes[1].node, nodes[1].keys_manager, Currency::BitcoinTestnet, Some(10_000), "test".to_string(),
 642                         Duration::from_secs(1234567), non_default_invoice_expiry_secs).unwrap();
 643                 assert_eq!(invoice.amount_pico_btc(), Some(100_000));
 644                 assert_eq!(invoice.min_final_cltv_expiry(), MIN_FINAL_CLTV_EXPIRY as u64);
 645                 assert_eq!(invoice.description(), InvoiceDescription::Direct(&Description("test".to_string())));
 646                 assert_eq!(invoice.expiry_time(), Duration::from_secs(non_default_invoice_expiry_secs.into()));
 647
 648                 // Invoice SCIDs should always use inbound SCID aliases over the real channel ID, if one is
 649                 // available.
 650                 let chan = &nodes[1].node.list_usable_channels()[0];
 651                 assert_eq!(invoice.route_hints().len(), 1);
 652                 assert_eq!(invoice.route_hints()[0].0.len(), 1);
 653                 assert_eq!(invoice.route_hints()[0].0[0].short_channel_id, chan.inbound_scid_alias.unwrap());
 654
 655                 assert_eq!(invoice.route_hints()[0].0[0].htlc_minimum_msat, chan.inbound_htlc_minimum_msat);
 656                 assert_eq!(invoice.route_hints()[0].0[0].htlc_maximum_msat, chan.inbound_htlc_maximum_msat);
 657
 658                 let payment_params = PaymentParameters::from_node_id(invoice.recover_payee_pub_key())
 659                         .with_features(invoice.features().unwrap().clone())
 660                         .with_route_hints(invoice.route_hints());
 661                 let route_params = RouteParameters {
 662                         payment_params,
 663                         final_value_msat: invoice.amount_milli_satoshis().unwrap(),
 664                         final_cltv_expiry_delta: invoice.min_final_cltv_expiry() as u32,
 665                 };
 666                 let first_hops = nodes[0].node.list_usable_channels();
 667                 let network_graph = &node_cfgs[0].network_graph;
 668                 let logger = test_utils::TestLogger::new();
 669                 let scorer = test_utils::TestScorer::with_penalty(0);
 670                 let random_seed_bytes = chanmon_cfgs[1].keys_manager.get_secure_random_bytes();
 671                 let route = find_route(
 672                         &nodes[0].node.get_our_node_id(), &route_params, &network_graph,
 673                         Some(&first_hops.iter().collect::<Vec<_>>()), &logger, &scorer, &random_seed_bytes
 674                 ).unwrap();
 675
 676                 let payment_event = {
 677                         let mut payment_hash = PaymentHash([0; 32]);
 678                         payment_hash.0.copy_from_slice(&invoice.payment_hash().as_ref()[0..32]);
 679                         nodes[0].node.send_payment(&route, payment_hash, &Some(invoice.payment_secret().clone())).unwrap();
 680                         let mut added_monitors = nodes[0].chain_monitor.added_monitors.lock().unwrap();
 681                         assert_eq!(added_monitors.len(), 1);
 682                         added_monitors.clear();
 683
 684                         let mut events = nodes[0].node.get_and_clear_pending_msg_events();
 685                         assert_eq!(events.len(), 1);
 686                         SendEvent::from_event(events.remove(0))
 687
 688                 };
 689                 nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]);
 690                 nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &payment_event.commitment_msg);
 691                 let mut added_monitors = nodes[1].chain_monitor.added_monitors.lock().unwrap();
 692                 assert_eq!(added_monitors.len(), 1);
 693                 added_monitors.clear();
 694                 let events = nodes[1].node.get_and_clear_pending_msg_events();
 695                 assert_eq!(events.len(), 2);
 696         }
 697
 698         #[test]
 699         fn test_create_invoice_with_description_hash() {
 700                 let chanmon_cfgs = create_chanmon_cfgs(2);
 701                 let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
 702                 let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
 703                 let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
 704                 let description_hash = crate::Sha256(Hash::hash("Testing description_hash".as_bytes()));
 705                 let invoice = ::utils::create_invoice_from_channelmanager_with_description_hash_and_duration_since_epoch(
 706                         &nodes[1].node, nodes[1].keys_manager, Currency::BitcoinTestnet, Some(10_000),
 707                         description_hash, Duration::from_secs(1234567), 3600
 708                 ).unwrap();
 709                 assert_eq!(invoice.amount_pico_btc(), Some(100_000));
 710                 assert_eq!(invoice.min_final_cltv_expiry(), MIN_FINAL_CLTV_EXPIRY as u64);
 711                 assert_eq!(invoice.description(), InvoiceDescription::Hash(&crate::Sha256(Sha256::hash("Testing description_hash".as_bytes()))));
 712         }
 713
 714         #[test]
 715         fn test_hints_includes_single_channels_to_nodes() {
 716                 let chanmon_cfgs = create_chanmon_cfgs(3);
 717                 let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
 718                 let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
 719                 let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
 720
 721                 let chan_1_0 = create_unannounced_chan_between_nodes_with_value(&nodes, 1, 0, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
 722                 let chan_2_0 = create_unannounced_chan_between_nodes_with_value(&nodes, 2, 0, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
 723
 724                 let mut scid_aliases = HashSet::new();
 725                 scid_aliases.insert(chan_1_0.0.short_channel_id_alias.unwrap());
 726                 scid_aliases.insert(chan_2_0.0.short_channel_id_alias.unwrap());
 727
 728                 match_invoice_routes(Some(5000), &nodes[0], scid_aliases);
 729         }
 730
 731         #[test]
 732         fn test_hints_has_only_highest_inbound_capacity_channel() {
 733                 let chanmon_cfgs = create_chanmon_cfgs(2);
 734                 let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
 735                 let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
 736                 let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
 737                 let _chan_1_0_low_inbound_capacity = create_unannounced_chan_between_nodes_with_value(&nodes, 1, 0, 100_000, 0, channelmanager::provided_init_features(), channelmanager::provided_init_features());
 738                 let chan_1_0_high_inbound_capacity = create_unannounced_chan_between_nodes_with_value(&nodes, 1, 0, 10_000_000, 0, channelmanager::provided_init_features(), channelmanager::provided_init_features());
 739                 let _chan_1_0_medium_inbound_capacity = create_unannounced_chan_between_nodes_with_value(&nodes, 1, 0, 1_000_000, 0, channelmanager::provided_init_features(), channelmanager::provided_init_features());
 740
 741                 let mut scid_aliases = HashSet::new();
 742                 scid_aliases.insert(chan_1_0_high_inbound_capacity.0.short_channel_id_alias.unwrap());
 743
 744                 match_invoice_routes(Some(5000), &nodes[0], scid_aliases);
 745         }
 746
 747         #[test]
 748         fn test_hints_has_only_online_channels() {
 749                 let chanmon_cfgs = create_chanmon_cfgs(4);
 750                 let node_cfgs = create_node_cfgs(4, &chanmon_cfgs);
 751                 let node_chanmgrs = create_node_chanmgrs(4, &node_cfgs, &[None, None, None, None]);
 752                 let nodes = create_network(4, &node_cfgs, &node_chanmgrs);
 753                 let chan_a = create_unannounced_chan_between_nodes_with_value(&nodes, 1, 0, 10_000_000, 0, channelmanager::provided_init_features(), channelmanager::provided_init_features());
 754                 let chan_b = create_unannounced_chan_between_nodes_with_value(&nodes, 2, 0, 10_000_000, 0, channelmanager::provided_init_features(), channelmanager::provided_init_features());
 755                 let _chan_c = create_unannounced_chan_between_nodes_with_value(&nodes, 3, 0, 1_000_000, 0, channelmanager::provided_init_features(), channelmanager::provided_init_features());
 756
 757                 // With all peers connected we should get all hints that have sufficient value
 758                 let mut scid_aliases = HashSet::new();
 759                 scid_aliases.insert(chan_a.0.short_channel_id_alias.unwrap());
 760                 scid_aliases.insert(chan_b.0.short_channel_id_alias.unwrap());
 761
 762                 match_invoice_routes(Some(1_000_000_000), &nodes[0], scid_aliases.clone());
 763
 764                 // With only one sufficient-value peer connected we should only get its hint
 765                 scid_aliases.remove(&chan_b.0.short_channel_id_alias.unwrap());
 766                 nodes[0].node.peer_disconnected(&nodes[2].node.get_our_node_id(), false);
 767                 match_invoice_routes(Some(1_000_000_000), &nodes[0], scid_aliases.clone());
 768
 769                 // If we don't have any sufficient-value peers connected we should get all hints with
 770                 // sufficient value, even though there is a connected insufficient-value peer.
 771                 scid_aliases.insert(chan_b.0.short_channel_id_alias.unwrap());
 772                 nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
 773                 match_invoice_routes(Some(1_000_000_000), &nodes[0], scid_aliases);
 774         }
 775
 776         #[test]
 777         fn test_forwarding_info_not_assigned_channel_excluded_from_hints() {
 778                 let chanmon_cfgs = create_chanmon_cfgs(3);
 779                 let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
 780                 let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
 781                 let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
 782                 let chan_1_0 = create_unannounced_chan_between_nodes_with_value(&nodes, 1, 0, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
 783
 784                 // Create an unannonced channel between `nodes[2]` and `nodes[0]`, for which the
 785                 // `msgs::ChannelUpdate` is never handled for the node(s). As the `msgs::ChannelUpdate`
 786                 // is never handled, the `channel.counterparty.forwarding_info` is never assigned.
 787                 let mut private_chan_cfg = UserConfig::default();
 788                 private_chan_cfg.channel_handshake_config.announced_channel = false;
 789                 let temporary_channel_id = nodes[2].node.create_channel(nodes[0].node.get_our_node_id(), 1_000_000, 500_000_000, 42, Some(private_chan_cfg)).unwrap();
 790                 let open_channel = get_event_msg!(nodes[2], MessageSendEvent::SendOpenChannel, nodes[0].node.get_our_node_id());
 791                 nodes[0].node.handle_open_channel(&nodes[2].node.get_our_node_id(), channelmanager::provided_init_features(), &open_channel);
 792                 let accept_channel = get_event_msg!(nodes[0], MessageSendEvent::SendAcceptChannel, nodes[2].node.get_our_node_id());
 793                 nodes[2].node.handle_accept_channel(&nodes[0].node.get_our_node_id(), channelmanager::provided_init_features(), &accept_channel);
 794
 795                 let tx = sign_funding_transaction(&nodes[2], &nodes[0], 1_000_000, temporary_channel_id);
 796
 797                 let conf_height = core::cmp::max(nodes[2].best_block_info().1 + 1, nodes[0].best_block_info().1 + 1);
 798                 confirm_transaction_at(&nodes[2], &tx, conf_height);
 799                 connect_blocks(&nodes[2], CHAN_CONFIRM_DEPTH - 1);
 800                 confirm_transaction_at(&nodes[0], &tx, conf_height);
 801                 connect_blocks(&nodes[0], CHAN_CONFIRM_DEPTH - 1);
 802                 let as_channel_ready = get_event_msg!(nodes[2], MessageSendEvent::SendChannelReady, nodes[0].node.get_our_node_id());
 803                 nodes[2].node.handle_channel_ready(&nodes[0].node.get_our_node_id(), &get_event_msg!(nodes[0], MessageSendEvent::SendChannelReady, nodes[2].node.get_our_node_id()));
 804                 get_event_msg!(nodes[2], MessageSendEvent::SendChannelUpdate, nodes[0].node.get_our_node_id());
 805                 nodes[0].node.handle_channel_ready(&nodes[2].node.get_our_node_id(), &as_channel_ready);
 806                 get_event_msg!(nodes[0], MessageSendEvent::SendChannelUpdate, nodes[2].node.get_our_node_id());
 807
 808                 // As `msgs::ChannelUpdate` was never handled for the participating node(s) of the second
 809                 // channel, the channel will never be assigned any `counterparty.forwarding_info`.
 810                 // Therefore only `chan_1_0` should be included in the hints.
 811                 let mut scid_aliases = HashSet::new();
 812                 scid_aliases.insert(chan_1_0.0.short_channel_id_alias.unwrap());
 813                 match_invoice_routes(Some(5000), &nodes[0], scid_aliases);
 814         }
 815
 816         #[test]
 817         fn test_no_hints_if_a_mix_between_public_and_private_channel_exists() {
 818                 let chanmon_cfgs = create_chanmon_cfgs(3);
 819                 let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
 820                 let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
 821                 let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
 822                 let _chan_1_0 = create_unannounced_chan_between_nodes_with_value(&nodes, 1, 0, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
 823
 824                 let chan_2_0 = create_announced_chan_between_nodes_with_value(&nodes, 2, 0, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
 825                 nodes[2].node.handle_channel_update(&nodes[0].node.get_our_node_id(), &chan_2_0.1);
 826                 nodes[0].node.handle_channel_update(&nodes[2].node.get_our_node_id(), &chan_2_0.0);
 827
 828                 // Ensure that the invoice doesn't include any route hints for any of `nodes[0]` channels,
 829                 // even though all channels between `nodes[1]` and `nodes[0]` are private, as there is a
 830                 // public channel between `nodes[2]` and `nodes[0]`
 831                 match_invoice_routes(Some(5000), &nodes[0], HashSet::new());
 832         }
 833
 834         #[test]
 835         fn test_only_public_channels_includes_no_channels_in_hints() {
 836                 let chanmon_cfgs = create_chanmon_cfgs(3);
 837                 let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
 838                 let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
 839                 let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
 840                 let chan_1_0 = create_announced_chan_between_nodes_with_value(&nodes, 1, 0, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
 841                 nodes[0].node.handle_channel_update(&nodes[1].node.get_our_node_id(), &chan_1_0.0);
 842                 nodes[1].node.handle_channel_update(&nodes[0].node.get_our_node_id(), &chan_1_0.1);
 843
 844                 let chan_2_0 = create_announced_chan_between_nodes_with_value(&nodes, 2, 0, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
 845                 nodes[2].node.handle_channel_update(&nodes[0].node.get_our_node_id(), &chan_2_0.1);
 846                 nodes[0].node.handle_channel_update(&nodes[2].node.get_our_node_id(), &chan_2_0.0);
 847
 848                 // As all of `nodes[0]` channels are public, no channels should be included in the hints
 849                 match_invoice_routes(Some(5000), &nodes[0], HashSet::new());
 850         }
 851
 852         #[test]
 853         fn test_channels_with_lower_inbound_capacity_than_invoice_amt_hints_filtering() {
 854                 let chanmon_cfgs = create_chanmon_cfgs(3);
 855                 let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
 856                 let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
 857                 let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
 858                 let chan_1_0 = create_unannounced_chan_between_nodes_with_value(&nodes, 1, 0, 100_000, 0, channelmanager::provided_init_features(), channelmanager::provided_init_features());
 859                 let chan_2_0 = create_unannounced_chan_between_nodes_with_value(&nodes, 2, 0, 1_000_000, 0, channelmanager::provided_init_features(), channelmanager::provided_init_features());
 860
 861                 // As the invoice amt is 1 msat above chan_1_0's inbound capacity, it shouldn't be included
 862                 let mut scid_aliases_99_000_001_msat = HashSet::new();
 863                 scid_aliases_99_000_001_msat.insert(chan_2_0.0.short_channel_id_alias.unwrap());
 864
 865                 match_invoice_routes(Some(99_000_001), &nodes[0], scid_aliases_99_000_001_msat);
 866
 867                 // As the invoice amt is exactly at chan_1_0's inbound capacity, it should be included
 868                 let mut scid_aliases_99_000_000_msat = HashSet::new();
 869                 scid_aliases_99_000_000_msat.insert(chan_1_0.0.short_channel_id_alias.unwrap());
 870                 scid_aliases_99_000_000_msat.insert(chan_2_0.0.short_channel_id_alias.unwrap());
 871
 872                 match_invoice_routes(Some(99_000_000), &nodes[0], scid_aliases_99_000_000_msat);
 873
 874                 // As the invoice amt is above all channels' inbound capacity, they will still be included
 875                 let mut scid_aliases_2_000_000_000_msat = HashSet::new();
 876                 scid_aliases_2_000_000_000_msat.insert(chan_1_0.0.short_channel_id_alias.unwrap());
 877                 scid_aliases_2_000_000_000_msat.insert(chan_2_0.0.short_channel_id_alias.unwrap());
 878
 879                 match_invoice_routes(Some(2_000_000_000), &nodes[0], scid_aliases_2_000_000_000_msat);
 880
 881                 // An invoice with no specified amount should include all channels in the route hints.
 882                 let mut scid_aliases_no_specified_amount = HashSet::new();
 883                 scid_aliases_no_specified_amount.insert(chan_1_0.0.short_channel_id_alias.unwrap());
 884                 scid_aliases_no_specified_amount.insert(chan_2_0.0.short_channel_id_alias.unwrap());
 885
 886                 match_invoice_routes(None, &nodes[0], scid_aliases_no_specified_amount);
 887         }
 888
 889         fn match_invoice_routes<'a, 'b: 'a, 'c: 'b>(
 890                 invoice_amt: Option<u64>,
 891                 invoice_node: &Node<'a, 'b, 'c>,
 892                 mut chan_ids_to_match: HashSet<u64>
 893         ) {
 894                 let invoice = create_invoice_from_channelmanager_and_duration_since_epoch(
 895                         &invoice_node.node, invoice_node.keys_manager, Currency::BitcoinTestnet, invoice_amt, "test".to_string(),
 896                         Duration::from_secs(1234567), 3600).unwrap();
 897                 let hints = invoice.private_routes();
 898
 899                 for hint in hints {
 900                         let hint_short_chan_id = (hint.0).0[0].short_channel_id;
 901                         assert!(chan_ids_to_match.remove(&hint_short_chan_id));
 902                 }
 903                 assert!(chan_ids_to_match.is_empty(), "Unmatched short channel ids: {:?}", chan_ids_to_match);
 904         }
 905
 906         #[test]
 907         #[cfg(feature = "std")]
 908         fn test_multi_node_receive() {
 909                 do_test_multi_node_receive(true);
 910                 do_test_multi_node_receive(false);
 911         }
 912
 913         #[cfg(feature = "std")]
 914         fn do_test_multi_node_receive(user_generated_pmt_hash: bool) {
 915                 let mut chanmon_cfgs = create_chanmon_cfgs(3);
 916                 let seed_1 = [42 as u8; 32];
 917                 let seed_2 = [43 as u8; 32];
 918                 let cross_node_seed = [44 as u8; 32];
 919                 chanmon_cfgs[1].keys_manager.backing = PhantomKeysManager::new(&seed_1, 43, 44, &cross_node_seed);
 920                 chanmon_cfgs[2].keys_manager.backing = PhantomKeysManager::new(&seed_2, 43, 44, &cross_node_seed);
 921                 let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
 922                 let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
 923                 let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
 924                 let chan_0_1 = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
 925                 nodes[0].node.handle_channel_update(&nodes[1].node.get_our_node_id(), &chan_0_1.1);
 926                 nodes[1].node.handle_channel_update(&nodes[0].node.get_our_node_id(), &chan_0_1.0);
 927                 let chan_0_2 = create_announced_chan_between_nodes_with_value(&nodes, 0, 2, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
 928                 nodes[0].node.handle_channel_update(&nodes[2].node.get_our_node_id(), &chan_0_2.1);
 929                 nodes[2].node.handle_channel_update(&nodes[0].node.get_our_node_id(), &chan_0_2.0);
 930
 931                 let payment_amt = 10_000;
 932                 let route_hints = vec![
 933                         nodes[1].node.get_phantom_route_hints(),
 934                         nodes[2].node.get_phantom_route_hints(),
 935                 ];
 936
 937                 let user_payment_preimage = PaymentPreimage([1; 32]);
 938                 let payment_hash = if user_generated_pmt_hash {
 939                         Some(PaymentHash(Sha256::hash(&user_payment_preimage.0[..]).into_inner()))
 940                 } else {
 941                         None
 942                 };
 943                 let non_default_invoice_expiry_secs = 4200;
 944
 945                 let invoice =
 946                         ::utils::create_phantom_invoice::<EnforcingSigner, &test_utils::TestKeysInterface>(
 947                                 Some(payment_amt), payment_hash, "test".to_string(), non_default_invoice_expiry_secs,
 948                                 route_hints, &nodes[1].keys_manager, Currency::BitcoinTestnet
 949                         ).unwrap();
 950                 let (payment_hash, payment_secret) = (PaymentHash(invoice.payment_hash().into_inner()), *invoice.payment_secret());
 951                 let payment_preimage = if user_generated_pmt_hash {
 952                         user_payment_preimage
 953                 } else {
 954                         nodes[1].node.get_payment_preimage(payment_hash, payment_secret).unwrap()
 955                 };
 956
 957                 assert_eq!(invoice.min_final_cltv_expiry(), MIN_FINAL_CLTV_EXPIRY as u64);
 958                 assert_eq!(invoice.description(), InvoiceDescription::Direct(&Description("test".to_string())));
 959                 assert_eq!(invoice.route_hints().len(), 2);
 960                 assert_eq!(invoice.expiry_time(), Duration::from_secs(non_default_invoice_expiry_secs.into()));
 961                 assert!(!invoice.features().unwrap().supports_basic_mpp());
 962
 963                 let payment_params = PaymentParameters::from_node_id(invoice.recover_payee_pub_key())
 964                         .with_features(invoice.features().unwrap().clone())
 965                         .with_route_hints(invoice.route_hints());
 966                 let params = RouteParameters {
 967                         payment_params,
 968                         final_value_msat: invoice.amount_milli_satoshis().unwrap(),
 969                         final_cltv_expiry_delta: invoice.min_final_cltv_expiry() as u32,
 970                 };
 971                 let first_hops = nodes[0].node.list_usable_channels();
 972                 let network_graph = &node_cfgs[0].network_graph;
 973                 let logger = test_utils::TestLogger::new();
 974                 let scorer = test_utils::TestScorer::with_penalty(0);
 975                 let random_seed_bytes = chanmon_cfgs[1].keys_manager.get_secure_random_bytes();
 976                 let route = find_route(
 977                         &nodes[0].node.get_our_node_id(), &params, &network_graph,
 978                         Some(&first_hops.iter().collect::<Vec<_>>()), &logger, &scorer, &random_seed_bytes
 979                 ).unwrap();
 980                 let (payment_event, fwd_idx) = {
 981                         let mut payment_hash = PaymentHash([0; 32]);
 982                         payment_hash.0.copy_from_slice(&invoice.payment_hash().as_ref()[0..32]);
 983                         nodes[0].node.send_payment(&route, payment_hash, &Some(invoice.payment_secret().clone())).unwrap();
 984                         let mut added_monitors = nodes[0].chain_monitor.added_monitors.lock().unwrap();
 985                         assert_eq!(added_monitors.len(), 1);
 986                         added_monitors.clear();
 987
 988                         let mut events = nodes[0].node.get_and_clear_pending_msg_events();
 989                         assert_eq!(events.len(), 1);
 990                         let fwd_idx = match events[0] {
 991                                 MessageSendEvent::UpdateHTLCs { node_id, .. } => {
 992                                         if node_id == nodes[1].node.get_our_node_id() {
 993                                                 1
 994                                         } else { 2 }
 995                                 },
 996                                 _ => panic!("Unexpected event")
 997                         };
 998                         (SendEvent::from_event(events.remove(0)), fwd_idx)
 999                 };
1000                 nodes[fwd_idx].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]);
1001                 commitment_signed_dance!(nodes[fwd_idx], nodes[0], &payment_event.commitment_msg, false, true);
1002
1003                 // Note that we have to "forward pending HTLCs" twice before we see the PaymentReceived as
1004                 // this "emulates" the payment taking two hops, providing some privacy to make phantom node
1005                 // payments "look real" by taking more time.
1006                 expect_pending_htlcs_forwardable_ignore!(nodes[fwd_idx]);
1007                 nodes[fwd_idx].node.process_pending_htlc_forwards();
1008                 expect_pending_htlcs_forwardable_ignore!(nodes[fwd_idx]);
1009                 nodes[fwd_idx].node.process_pending_htlc_forwards();
1010
1011                 let payment_preimage_opt = if user_generated_pmt_hash { None } else { Some(payment_preimage) };
1012                 expect_payment_received!(&nodes[fwd_idx], payment_hash, payment_secret, payment_amt, payment_preimage_opt);
1013                 do_claim_payment_along_route(&nodes[0], &vec!(&vec!(&nodes[fwd_idx])[..]), false, payment_preimage);
1014                 let events = nodes[0].node.get_and_clear_pending_events();
1015                 assert_eq!(events.len(), 2);
1016                 match events[0] {
1017                         Event::PaymentSent { payment_preimage: ref ev_preimage, payment_hash: ref ev_hash, ref fee_paid_msat, .. } => {
1018                                 assert_eq!(payment_preimage, *ev_preimage);
1019                                 assert_eq!(payment_hash, *ev_hash);
1020                                 assert_eq!(fee_paid_msat, &Some(0));
1021                         },
1022                         _ => panic!("Unexpected event")
1023                 }
1024                 match events[1] {
1025                         Event::PaymentPathSuccessful { payment_hash: hash, .. } => {
1026                                 assert_eq!(hash, Some(payment_hash));
1027                         },
1028                         _ => panic!("Unexpected event")
1029                 }
1030         }
1031
1032         #[test]
1033         #[cfg(feature = "std")]
1034         fn test_multi_node_hints_has_htlc_min_max_values() {
1035                 let mut chanmon_cfgs = create_chanmon_cfgs(3);
1036                 let seed_1 = [42 as u8; 32];
1037                 let seed_2 = [43 as u8; 32];
1038                 let cross_node_seed = [44 as u8; 32];
1039                 chanmon_cfgs[1].keys_manager.backing = PhantomKeysManager::new(&seed_1, 43, 44, &cross_node_seed);
1040                 chanmon_cfgs[2].keys_manager.backing = PhantomKeysManager::new(&seed_2, 43, 44, &cross_node_seed);
1041                 let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
1042                 let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
1043                 let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
1044
1045                 create_unannounced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
1046                 create_unannounced_chan_between_nodes_with_value(&nodes, 0, 2, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
1047
1048                 let payment_amt = 20_000;
1049                 let (payment_hash, _payment_secret) = nodes[1].node.create_inbound_payment(Some(payment_amt), 3600).unwrap();
1050                 let route_hints = vec![
1051                         nodes[1].node.get_phantom_route_hints(),
1052                         nodes[2].node.get_phantom_route_hints(),
1053                 ];
1054
1055                 let invoice = ::utils::create_phantom_invoice::<EnforcingSigner, &test_utils::TestKeysInterface>(Some(payment_amt), Some(payment_hash), "test".to_string(), 3600, route_hints, &nodes[1].keys_manager, Currency::BitcoinTestnet).unwrap();
1056
1057                 let chan_0_1 = &nodes[1].node.list_usable_channels()[0];
1058                 assert_eq!(invoice.route_hints()[0].0[0].htlc_minimum_msat, chan_0_1.inbound_htlc_minimum_msat);
1059                 assert_eq!(invoice.route_hints()[0].0[0].htlc_maximum_msat, chan_0_1.inbound_htlc_maximum_msat);
1060
1061                 let chan_0_2 = &nodes[2].node.list_usable_channels()[0];
1062                 assert_eq!(invoice.route_hints()[1].0[0].htlc_minimum_msat, chan_0_2.inbound_htlc_minimum_msat);
1063                 assert_eq!(invoice.route_hints()[1].0[0].htlc_maximum_msat, chan_0_2.inbound_htlc_maximum_msat);
1064         }
1065
1066         #[test]
1067         #[cfg(feature = "std")]
1068         fn create_phantom_invoice_with_description_hash() {
1069                 let chanmon_cfgs = create_chanmon_cfgs(3);
1070                 let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
1071                 let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
1072                 let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
1073
1074                 let payment_amt = 20_000;
1075                 let route_hints = vec![
1076                         nodes[1].node.get_phantom_route_hints(),
1077                         nodes[2].node.get_phantom_route_hints(),
1078                 ];
1079
1080                 let description_hash = crate::Sha256(Hash::hash("Description hash phantom invoice".as_bytes()));
1081                 let non_default_invoice_expiry_secs = 4200;
1082                 let invoice = ::utils::create_phantom_invoice_with_description_hash::<
1083                         EnforcingSigner, &test_utils::TestKeysInterface,
1084                 >(
1085                         Some(payment_amt), None, non_default_invoice_expiry_secs, description_hash,
1086                         route_hints, &nodes[1].keys_manager, Currency::BitcoinTestnet
1087                 )
1088                 .unwrap();
1089                 assert_eq!(invoice.amount_pico_btc(), Some(200_000));
1090                 assert_eq!(invoice.min_final_cltv_expiry(), MIN_FINAL_CLTV_EXPIRY as u64);
1091                 assert_eq!(invoice.expiry_time(), Duration::from_secs(non_default_invoice_expiry_secs.into()));
1092                 assert_eq!(invoice.description(), InvoiceDescription::Hash(&crate::Sha256(Sha256::hash("Description hash phantom invoice".as_bytes()))));
1093         }
1094
1095         #[test]
1096         #[cfg(feature = "std")]
1097         fn test_multi_node_hints_includes_single_channels_to_participating_nodes() {
1098                 let mut chanmon_cfgs = create_chanmon_cfgs(3);
1099                 let seed_1 = [42 as u8; 32];
1100                 let seed_2 = [43 as u8; 32];
1101                 let cross_node_seed = [44 as u8; 32];
1102                 chanmon_cfgs[1].keys_manager.backing = PhantomKeysManager::new(&seed_1, 43, 44, &cross_node_seed);
1103                 chanmon_cfgs[2].keys_manager.backing = PhantomKeysManager::new(&seed_2, 43, 44, &cross_node_seed);
1104                 let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
1105                 let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
1106                 let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
1107
1108                 let chan_0_1 = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
1109                 let chan_0_2 = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 2, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
1110
1111                 let mut scid_aliases = HashSet::new();
1112                 scid_aliases.insert(chan_0_1.0.short_channel_id_alias.unwrap());
1113                 scid_aliases.insert(chan_0_2.0.short_channel_id_alias.unwrap());
1114
1115                 match_multi_node_invoice_routes(
1116                         Some(10_000),
1117                         &nodes[1],
1118                         vec![&nodes[1], &nodes[2],],
1119                         scid_aliases,
1120                         false
1121                 );
1122         }
1123
1124         #[test]
1125         #[cfg(feature = "std")]
1126         fn test_multi_node_hints_includes_one_channel_of_each_counterparty_nodes_per_participating_node() {
1127                 let mut chanmon_cfgs = create_chanmon_cfgs(4);
1128                 let seed_1 = [42 as u8; 32];
1129                 let seed_2 = [43 as u8; 32];
1130                 let cross_node_seed = [44 as u8; 32];
1131                 chanmon_cfgs[2].keys_manager.backing = PhantomKeysManager::new(&seed_1, 43, 44, &cross_node_seed);
1132                 chanmon_cfgs[3].keys_manager.backing = PhantomKeysManager::new(&seed_2, 43, 44, &cross_node_seed);
1133                 let node_cfgs = create_node_cfgs(4, &chanmon_cfgs);
1134                 let node_chanmgrs = create_node_chanmgrs(4, &node_cfgs, &[None, None, None, None]);
1135                 let nodes = create_network(4, &node_cfgs, &node_chanmgrs);
1136
1137                 let chan_0_2 = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 2, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
1138                 let chan_0_3 = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 3, 1000000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
1139                 let chan_1_3 = create_unannounced_chan_between_nodes_with_value(&nodes, 1, 3, 3_000_000, 10005, channelmanager::provided_init_features(), channelmanager::provided_init_features());
1140
1141                 let mut scid_aliases = HashSet::new();
1142                 scid_aliases.insert(chan_0_2.0.short_channel_id_alias.unwrap());
1143                 scid_aliases.insert(chan_0_3.0.short_channel_id_alias.unwrap());
1144                 scid_aliases.insert(chan_1_3.0.short_channel_id_alias.unwrap());
1145
1146                 match_multi_node_invoice_routes(
1147                         Some(10_000),
1148                         &nodes[2],
1149                         vec![&nodes[2], &nodes[3],],
1150                         scid_aliases,
1151                         false
1152                 );
1153         }
1154
1155         #[test]
1156         #[cfg(feature = "std")]
1157         fn test_multi_node_forwarding_info_not_assigned_channel_excluded_from_hints() {
1158                 let mut chanmon_cfgs = create_chanmon_cfgs(4);
1159                 let seed_1 = [42 as u8; 32];
1160                 let seed_2 = [43 as u8; 32];
1161                 let cross_node_seed = [44 as u8; 32];
1162                 chanmon_cfgs[2].keys_manager.backing = PhantomKeysManager::new(&seed_1, 43, 44, &cross_node_seed);
1163                 chanmon_cfgs[3].keys_manager.backing = PhantomKeysManager::new(&seed_2, 43, 44, &cross_node_seed);
1164                 let node_cfgs = create_node_cfgs(4, &chanmon_cfgs);
1165                 let node_chanmgrs = create_node_chanmgrs(4, &node_cfgs, &[None, None, None, None]);
1166                 let nodes = create_network(4, &node_cfgs, &node_chanmgrs);
1167
1168                 let chan_0_2 = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 2, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
1169                 let chan_0_3 = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 3, 1000000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
1170
1171                 // Create an unannonced channel between `nodes[1]` and `nodes[3]`, for which the
1172                 // `msgs::ChannelUpdate` is never handled for the node(s). As the `msgs::ChannelUpdate`
1173                 // is never handled, the `channel.counterparty.forwarding_info` is never assigned.
1174                 let mut private_chan_cfg = UserConfig::default();
1175                 private_chan_cfg.channel_handshake_config.announced_channel = false;
1176                 let temporary_channel_id = nodes[1].node.create_channel(nodes[3].node.get_our_node_id(), 1_000_000, 500_000_000, 42, Some(private_chan_cfg)).unwrap();
1177                 let open_channel = get_event_msg!(nodes[1], MessageSendEvent::SendOpenChannel, nodes[3].node.get_our_node_id());
1178                 nodes[3].node.handle_open_channel(&nodes[1].node.get_our_node_id(), channelmanager::provided_init_features(), &open_channel);
1179                 let accept_channel = get_event_msg!(nodes[3], MessageSendEvent::SendAcceptChannel, nodes[1].node.get_our_node_id());
1180                 nodes[1].node.handle_accept_channel(&nodes[3].node.get_our_node_id(), channelmanager::provided_init_features(), &accept_channel);
1181
1182                 let tx = sign_funding_transaction(&nodes[1], &nodes[3], 1_000_000, temporary_channel_id);
1183
1184                 let conf_height = core::cmp::max(nodes[1].best_block_info().1 + 1, nodes[3].best_block_info().1 + 1);
1185                 confirm_transaction_at(&nodes[1], &tx, conf_height);
1186                 connect_blocks(&nodes[1], CHAN_CONFIRM_DEPTH - 1);
1187                 confirm_transaction_at(&nodes[3], &tx, conf_height);
1188                 connect_blocks(&nodes[3], CHAN_CONFIRM_DEPTH - 1);
1189                 let as_channel_ready = get_event_msg!(nodes[1], MessageSendEvent::SendChannelReady, nodes[3].node.get_our_node_id());
1190                 nodes[1].node.handle_channel_ready(&nodes[3].node.get_our_node_id(), &get_event_msg!(nodes[3], MessageSendEvent::SendChannelReady, nodes[1].node.get_our_node_id()));
1191                 get_event_msg!(nodes[1], MessageSendEvent::SendChannelUpdate, nodes[3].node.get_our_node_id());
1192                 nodes[3].node.handle_channel_ready(&nodes[1].node.get_our_node_id(), &as_channel_ready);
1193                 get_event_msg!(nodes[3], MessageSendEvent::SendChannelUpdate, nodes[1].node.get_our_node_id());
1194
1195                 // As `msgs::ChannelUpdate` was never handled for the participating node(s) of the third
1196                 // channel, the channel will never be assigned any `counterparty.forwarding_info`.
1197                 // Therefore only `chan_0_3` should be included in the hints for `nodes[3]`.
1198                 let mut scid_aliases = HashSet::new();
1199                 scid_aliases.insert(chan_0_2.0.short_channel_id_alias.unwrap());
1200                 scid_aliases.insert(chan_0_3.0.short_channel_id_alias.unwrap());
1201
1202                 match_multi_node_invoice_routes(
1203                         Some(10_000),
1204                         &nodes[2],
1205                         vec![&nodes[2], &nodes[3],],
1206                         scid_aliases,
1207                         false
1208                 );
1209         }
1210
1211         #[test]
1212         #[cfg(feature = "std")]
1213         fn test_multi_node_with_only_public_channels_hints_includes_only_phantom_route() {
1214                 let mut chanmon_cfgs = create_chanmon_cfgs(3);
1215                 let seed_1 = [42 as u8; 32];
1216                 let seed_2 = [43 as u8; 32];
1217                 let cross_node_seed = [44 as u8; 32];
1218                 chanmon_cfgs[1].keys_manager.backing = PhantomKeysManager::new(&seed_1, 43, 44, &cross_node_seed);
1219                 chanmon_cfgs[2].keys_manager.backing = PhantomKeysManager::new(&seed_2, 43, 44, &cross_node_seed);
1220                 let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
1221                 let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
1222                 let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
1223
1224                 let chan_0_1 = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
1225
1226                 let chan_2_0 = create_announced_chan_between_nodes_with_value(&nodes, 2, 0, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
1227                 nodes[2].node.handle_channel_update(&nodes[0].node.get_our_node_id(), &chan_2_0.1);
1228                 nodes[0].node.handle_channel_update(&nodes[2].node.get_our_node_id(), &chan_2_0.0);
1229
1230                 // Hints should include `chan_0_1` from as `nodes[1]` only have private channels, but not
1231                 // `chan_0_2` as `nodes[2]` only has public channels.
1232                 let mut scid_aliases = HashSet::new();
1233                 scid_aliases.insert(chan_0_1.0.short_channel_id_alias.unwrap());
1234
1235                 match_multi_node_invoice_routes(
1236                         Some(10_000),
1237                         &nodes[1],
1238                         vec![&nodes[1], &nodes[2],],
1239                         scid_aliases,
1240                         true
1241                 );
1242         }
1243
1244         #[test]
1245         #[cfg(feature = "std")]
1246         fn test_multi_node_with_mixed_public_and_private_channel_hints_includes_only_phantom_route() {
1247                 let mut chanmon_cfgs = create_chanmon_cfgs(4);
1248                 let seed_1 = [42 as u8; 32];
1249                 let seed_2 = [43 as u8; 32];
1250                 let cross_node_seed = [44 as u8; 32];
1251                 chanmon_cfgs[1].keys_manager.backing = PhantomKeysManager::new(&seed_1, 43, 44, &cross_node_seed);
1252                 chanmon_cfgs[2].keys_manager.backing = PhantomKeysManager::new(&seed_2, 43, 44, &cross_node_seed);
1253                 let node_cfgs = create_node_cfgs(4, &chanmon_cfgs);
1254                 let node_chanmgrs = create_node_chanmgrs(4, &node_cfgs, &[None, None, None, None]);
1255                 let nodes = create_network(4, &node_cfgs, &node_chanmgrs);
1256
1257                 let chan_0_2 = create_announced_chan_between_nodes_with_value(&nodes, 0, 2, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
1258                 nodes[0].node.handle_channel_update(&nodes[2].node.get_our_node_id(), &chan_0_2.1);
1259                 nodes[2].node.handle_channel_update(&nodes[0].node.get_our_node_id(), &chan_0_2.0);
1260                 let _chan_1_2 = create_unannounced_chan_between_nodes_with_value(&nodes, 1, 2, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
1261
1262                 let chan_0_3 = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 3, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
1263
1264                 // Hints should include `chan_0_3` from as `nodes[3]` only have private channels, and no
1265                 // channels for `nodes[2]` as it contains a mix of public and private channels.
1266                 let mut scid_aliases = HashSet::new();
1267                 scid_aliases.insert(chan_0_3.0.short_channel_id_alias.unwrap());
1268
1269                 match_multi_node_invoice_routes(
1270                         Some(10_000),
1271                         &nodes[2],
1272                         vec![&nodes[2], &nodes[3],],
1273                         scid_aliases,
1274                         true
1275                 );
1276         }
1277
1278         #[test]
1279         #[cfg(feature = "std")]
1280         fn test_multi_node_hints_has_only_highest_inbound_capacity_channel() {
1281                 let mut chanmon_cfgs = create_chanmon_cfgs(3);
1282                 let seed_1 = [42 as u8; 32];
1283                 let seed_2 = [43 as u8; 32];
1284                 let cross_node_seed = [44 as u8; 32];
1285                 chanmon_cfgs[1].keys_manager.backing = PhantomKeysManager::new(&seed_1, 43, 44, &cross_node_seed);
1286                 chanmon_cfgs[2].keys_manager.backing = PhantomKeysManager::new(&seed_2, 43, 44, &cross_node_seed);
1287                 let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
1288                 let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
1289                 let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
1290
1291                 let _chan_0_1_low_inbound_capacity = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 1, 100_000, 0, channelmanager::provided_init_features(), channelmanager::provided_init_features());
1292                 let chan_0_1_high_inbound_capacity = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 1, 10_000_000, 0, channelmanager::provided_init_features(), channelmanager::provided_init_features());
1293                 let _chan_0_1_medium_inbound_capacity = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 1, 1_000_000, 0, channelmanager::provided_init_features(), channelmanager::provided_init_features());
1294                 let chan_0_2 = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 2, 100000, 10001, channelmanager::provided_init_features(), channelmanager::provided_init_features());
1295
1296                 let mut scid_aliases = HashSet::new();
1297                 scid_aliases.insert(chan_0_1_high_inbound_capacity.0.short_channel_id_alias.unwrap());
1298                 scid_aliases.insert(chan_0_2.0.short_channel_id_alias.unwrap());
1299
1300                 match_multi_node_invoice_routes(
1301                         Some(10_000),
1302                         &nodes[1],
1303                         vec![&nodes[1], &nodes[2],],
1304                         scid_aliases,
1305                         false
1306                 );
1307         }
1308
1309         #[test]
1310         #[cfg(feature = "std")]
1311         fn test_multi_node_channels_inbound_capacity_lower_than_invoice_amt_filtering() {
1312                 let mut chanmon_cfgs = create_chanmon_cfgs(4);
1313                 let seed_1 = [42 as u8; 32];
1314                 let seed_2 = [43 as u8; 32];
1315                 let cross_node_seed = [44 as u8; 32];
1316                 chanmon_cfgs[1].keys_manager.backing = PhantomKeysManager::new(&seed_1, 43, 44, &cross_node_seed);
1317                 chanmon_cfgs[2].keys_manager.backing = PhantomKeysManager::new(&seed_2, 43, 44, &cross_node_seed);
1318                 let node_cfgs = create_node_cfgs(4, &chanmon_cfgs);
1319                 let node_chanmgrs = create_node_chanmgrs(4, &node_cfgs, &[None, None, None, None]);
1320                 let nodes = create_network(4, &node_cfgs, &node_chanmgrs);
1321
1322                 let chan_0_2 = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 2, 1_000_000, 0, channelmanager::provided_init_features(), channelmanager::provided_init_features());
1323                 let chan_0_3 = create_unannounced_chan_between_nodes_with_value(&nodes, 0, 3, 100_000, 0, channelmanager::provided_init_features(), channelmanager::provided_init_features());
1324                 let chan_1_3 = create_unannounced_chan_between_nodes_with_value(&nodes, 1, 3, 200_000, 0, channelmanager::provided_init_features(), channelmanager::provided_init_features());
1325
1326                 // Since the invoice 1 msat above chan_0_3's inbound capacity, it should be filtered out.
1327                 let mut scid_aliases_99_000_001_msat = HashSet::new();
1328                 scid_aliases_99_000_001_msat.insert(chan_0_2.0.short_channel_id_alias.unwrap());
1329                 scid_aliases_99_000_001_msat.insert(chan_1_3.0.short_channel_id_alias.unwrap());
1330
1331                 match_multi_node_invoice_routes(
1332                         Some(99_000_001),
1333                         &nodes[2],
1334                         vec![&nodes[2], &nodes[3],],
1335                         scid_aliases_99_000_001_msat,
1336                         false
1337                 );
1338
1339                 // Since the invoice is exactly at chan_0_3's inbound capacity, it should be included.
1340                 let mut scid_aliases_99_000_000_msat = HashSet::new();
1341                 scid_aliases_99_000_000_msat.insert(chan_0_2.0.short_channel_id_alias.unwrap());
1342                 scid_aliases_99_000_000_msat.insert(chan_0_3.0.short_channel_id_alias.unwrap());
1343                 scid_aliases_99_000_000_msat.insert(chan_1_3.0.short_channel_id_alias.unwrap());
1344
1345                 match_multi_node_invoice_routes(
1346                         Some(99_000_000),
1347                         &nodes[2],
1348                         vec![&nodes[2], &nodes[3],],
1349                         scid_aliases_99_000_000_msat,
1350                         false
1351                 );
1352
1353                 // Since the invoice is above all of `nodes[2]` channels' inbound capacity, all of
1354                 // `nodes[2]` them should be included.
1355                 let mut scid_aliases_300_000_000_msat = HashSet::new();
1356                 scid_aliases_300_000_000_msat.insert(chan_0_2.0.short_channel_id_alias.unwrap());
1357                 scid_aliases_300_000_000_msat.insert(chan_0_3.0.short_channel_id_alias.unwrap());
1358                 scid_aliases_300_000_000_msat.insert(chan_1_3.0.short_channel_id_alias.unwrap());
1359
1360                 match_multi_node_invoice_routes(
1361                         Some(300_000_000),
1362                         &nodes[2],
1363                         vec![&nodes[2], &nodes[3],],
1364                         scid_aliases_300_000_000_msat,
1365                         false
1366                 );
1367
1368                 // Since the no specified amount, all channels should included.
1369                 let mut scid_aliases_no_specified_amount = HashSet::new();
1370                 scid_aliases_no_specified_amount.insert(chan_0_2.0.short_channel_id_alias.unwrap());
1371                 scid_aliases_no_specified_amount.insert(chan_0_3.0.short_channel_id_alias.unwrap());
1372                 scid_aliases_no_specified_amount.insert(chan_1_3.0.short_channel_id_alias.unwrap());
1373
1374                 match_multi_node_invoice_routes(
1375                         None,
1376                         &nodes[2],
1377                         vec![&nodes[2], &nodes[3],],
1378                         scid_aliases_no_specified_amount,
1379                         false
1380                 );
1381         }
1382
1383         #[cfg(feature = "std")]
1384         fn match_multi_node_invoice_routes<'a, 'b: 'a, 'c: 'b>(
1385                 invoice_amt: Option<u64>,
1386                 invoice_node: &Node<'a, 'b, 'c>,
1387                 network_multi_nodes: Vec<&Node<'a, 'b, 'c>>,
1388                 mut chan_ids_to_match: HashSet<u64>,
1389                 nodes_contains_public_channels: bool
1390         ){
1391                 let phantom_route_hints = network_multi_nodes.iter()
1392                         .map(|node| node.node.get_phantom_route_hints())
1393                         .collect::<Vec<PhantomRouteHints>>();
1394                 let phantom_scids = phantom_route_hints.iter()
1395                         .map(|route_hint| route_hint.phantom_scid)
1396                         .collect::<HashSet<u64>>();
1397
1398                 let invoice = ::utils::create_phantom_invoice::<EnforcingSigner, &test_utils::TestKeysInterface>(invoice_amt, None, "test".to_string(), 3600, phantom_route_hints, &invoice_node.keys_manager, Currency::BitcoinTestnet).unwrap();
1399
1400                 let invoice_hints = invoice.private_routes();
1401
1402                 for hint in invoice_hints {
1403                         let hints = &(hint.0).0;
1404                         match hints.len() {
1405                                 1 => {
1406                                         assert!(nodes_contains_public_channels);
1407                                         let phantom_scid = hints[0].short_channel_id;
1408                                         assert!(phantom_scids.contains(&phantom_scid));
1409                                 },
1410                                 2 => {
1411                                         let hint_short_chan_id = hints[0].short_channel_id;
1412                                         assert!(chan_ids_to_match.remove(&hint_short_chan_id));
1413                                         let phantom_scid = hints[1].short_channel_id;
1414                                         assert!(phantom_scids.contains(&phantom_scid));
1415                                 },
1416                                 _ => panic!("Incorrect hint length generated")
1417                         }
1418                 }
1419                 assert!(chan_ids_to_match.is_empty(), "Unmatched short channel ids: {:?}", chan_ids_to_match);
1420         }
1421 }