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

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