X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=blobdiff_plain;f=lightning%2Fsrc%2Fevents%2Fmod.rs;h=dede02a37cb9c5e6349dfb27e7504cc3b1fb83fc;hb=refs%2Fheads%2F2024-01-om-direct-export;hp=7da0470bdf02ebcb50a31313286007c5af25df59;hpb=b14927968fdce89f4640172f5d3d1c589043c481;p=rust-lightning diff --git a/lightning/src/events/mod.rs b/lightning/src/events/mod.rs index 7da0470b..dede02a3 100644 --- a/lightning/src/events/mod.rs +++ b/lightning/src/events/mod.rs @@ -23,15 +23,16 @@ use crate::ln::channelmanager::{InterceptId, PaymentId, RecipientOnionFields}; use crate::ln::channel::FUNDING_CONF_DEADLINE_BLOCKS; use crate::ln::features::ChannelTypeFeatures; use crate::ln::msgs; -use crate::ln::{PaymentPreimage, PaymentHash, PaymentSecret}; +use crate::ln::{ChannelId, PaymentPreimage, PaymentHash, PaymentSecret}; use crate::routing::gossip::NetworkUpdate; use crate::util::errors::APIError; use crate::util::ser::{BigSize, FixedLengthReader, Writeable, Writer, MaybeReadable, Readable, RequiredWrapper, UpgradableRequired, WithoutLength}; use crate::util::string::UntrustedString; use crate::routing::router::{BlindedTail, Path, RouteHop, RouteParameters}; -use bitcoin::{PackedLockTime, Transaction, OutPoint}; -use bitcoin::blockdata::script::Script; +use bitcoin::{Transaction, OutPoint}; +use bitcoin::blockdata::locktime::absolute::LockTime; +use bitcoin::blockdata::script::ScriptBuf; use bitcoin::hashes::Hash; use bitcoin::hashes::sha256::Hash as Sha256; use bitcoin::secp256k1::PublicKey; @@ -71,6 +72,16 @@ pub enum PaymentPurpose { SpontaneousPayment(PaymentPreimage), } +impl PaymentPurpose { + /// Returns the preimage for this payment, if it is known. + pub fn preimage(&self) -> Option { + match self { + PaymentPurpose::InvoicePayment { payment_preimage, .. } => *payment_preimage, + PaymentPurpose::SpontaneousPayment(preimage) => Some(*preimage), + } + } +} + impl_writeable_tlv_based_enum!(PaymentPurpose, (0, InvoicePayment) => { (0, payment_preimage, option), @@ -79,6 +90,43 @@ impl_writeable_tlv_based_enum!(PaymentPurpose, (2, SpontaneousPayment) ); +/// Information about an HTLC that is part of a payment that can be claimed. +#[derive(Clone, Debug, PartialEq, Eq)] +pub struct ClaimedHTLC { + /// The `channel_id` of the channel over which the HTLC was received. + pub channel_id: ChannelId, + /// The `user_channel_id` of the channel over which the HTLC was received. This is the value + /// passed in to [`ChannelManager::create_channel`] for outbound channels, or to + /// [`ChannelManager::accept_inbound_channel`] for inbound channels if + /// [`UserConfig::manually_accept_inbound_channels`] config flag is set to true. Otherwise + /// `user_channel_id` will be randomized for an inbound channel. + /// + /// This field will be zero for a payment that was serialized prior to LDK version 0.0.117. (This + /// should only happen in the case that a payment was claimable prior to LDK version 0.0.117, but + /// was not actually claimed until after upgrading.) + /// + /// [`ChannelManager::create_channel`]: crate::ln::channelmanager::ChannelManager::create_channel + /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel + /// [`UserConfig::manually_accept_inbound_channels`]: crate::util::config::UserConfig::manually_accept_inbound_channels + pub user_channel_id: u128, + /// The block height at which this HTLC expires. + pub cltv_expiry: u32, + /// The amount (in msats) of this part of an MPP. + pub value_msat: u64, + /// The extra fee our counterparty skimmed off the top of this HTLC, if any. + /// + /// This value will always be 0 for [`ClaimedHTLC`]s serialized with LDK versions prior to + /// 0.0.119. + pub counterparty_skimmed_fee_msat: u64, +} +impl_writeable_tlv_based!(ClaimedHTLC, { + (0, channel_id, required), + (1, counterparty_skimmed_fee_msat, (default_value, 0u64)), + (2, user_channel_id, required), + (4, cltv_expiry, required), + (6, value_msat, required), +}); + /// When the payment path failure took place and extra details about it. [`PathFailure::OnPath`] may /// contain a [`NetworkUpdate`] that needs to be applied to the [`NetworkGraph`]. /// @@ -168,6 +216,9 @@ pub enum ClosureReason { /// The counterparty requested a cooperative close of a channel that had not been funded yet. /// The channel has been immediately closed. CounterpartyCoopClosedUnfundedChannel, + /// Another channel in the same funding batch closed before the funding transaction + /// was ready to be broadcast. + FundingBatchClosure, } impl core::fmt::Display for ClosureReason { @@ -188,6 +239,7 @@ impl core::fmt::Display for ClosureReason { ClosureReason::DisconnectedPeer => f.write_str("the peer disconnected prior to the channel being funded"), ClosureReason::OutdatedChannelManager => f.write_str("the ChannelManager read from disk was stale compared to ChannelMonitor(s)"), ClosureReason::CounterpartyCoopClosedUnfundedChannel => f.write_str("the peer requested the unfunded channel be closed"), + ClosureReason::FundingBatchClosure => f.write_str("another channel in the same funding batch closed"), } } } @@ -202,6 +254,7 @@ impl_writeable_tlv_based_enum_upgradable!(ClosureReason, (10, DisconnectedPeer) => {}, (12, OutdatedChannelManager) => {}, (13, CounterpartyCoopClosedUnfundedChannel) => {}, + (15, FundingBatchClosure) => {} ); /// Intended destination of a failed HTLC as indicated in [`Event::HTLCHandlingFailed`]. @@ -215,7 +268,7 @@ pub enum HTLCDestination { /// counterparty node information. node_id: Option, /// The outgoing `channel_id` between us and the next node. - channel_id: [u8; 32], + channel_id: ChannelId, }, /// Scenario where we are unsure of the next node to forward the HTLC to. UnknownNextHop { @@ -333,7 +386,7 @@ pub enum Event { /// [`ChannelManager::funding_transaction_generated`]. /// /// [`ChannelManager::funding_transaction_generated`]: crate::ln::channelmanager::ChannelManager::funding_transaction_generated - temporary_channel_id: [u8; 32], + temporary_channel_id: ChannelId, /// The counterparty's node_id, which you'll need to pass back into /// [`ChannelManager::funding_transaction_generated`]. /// @@ -342,7 +395,7 @@ pub enum Event { /// The value, in satoshis, that the output should have. channel_value_satoshis: u64, /// The script which should be used in the transaction output. - output_script: Script, + output_script: ScriptBuf, /// The `user_channel_id` value passed in to [`ChannelManager::create_channel`] for outbound /// channels, or to [`ChannelManager::accept_inbound_channel`] for inbound channels if /// [`UserConfig::manually_accept_inbound_channels`] config flag is set to true. Otherwise @@ -427,7 +480,7 @@ pub enum Event { /// payment is to pay an invoice or to send a spontaneous payment. purpose: PaymentPurpose, /// The `channel_id` indicating over which channel we received the payment. - via_channel_id: Option<[u8; 32]>, + via_channel_id: Option, /// The `user_channel_id` indicating over which channel we received the payment. via_user_channel_id: Option, /// The block height at which this payment will be failed back and will no longer be @@ -470,6 +523,43 @@ pub enum Event { /// The purpose of the claimed payment, i.e. whether the payment was for an invoice or a /// spontaneous payment. purpose: PaymentPurpose, + /// The HTLCs that comprise the claimed payment. This will be empty for events serialized prior + /// to LDK version 0.0.117. + htlcs: Vec, + /// The sender-intended sum total of all the MPP parts. This will be `None` for events + /// serialized prior to LDK version 0.0.117. + sender_intended_total_msat: Option, + }, + /// Indicates that a peer connection with a node is needed in order to send an [`OnionMessage`]. + /// + /// Typically, this happens when a [`MessageRouter`] is unable to find a complete path to a + /// [`Destination`]. Once a connection is established, any messages buffered by an + /// [`OnionMessageHandler`] may be sent. + /// + /// This event will not be generated for onion message forwards; only for sends including + /// replies. Handlers should connect to the node otherwise any buffered messages may be lost. + /// + /// [`OnionMessage`]: msgs::OnionMessage + /// [`MessageRouter`]: crate::onion_message::messenger::MessageRouter + /// [`Destination`]: crate::onion_message::messenger::Destination + /// [`OnionMessageHandler`]: crate::ln::msgs::OnionMessageHandler + ConnectionNeeded { + /// The node id for the node needing a connection. + node_id: PublicKey, + /// Sockets for connecting to the node. + addresses: Vec, + }, + /// Indicates a request for an invoice failed to yield a response in a reasonable amount of time + /// or was explicitly abandoned by [`ChannelManager::abandon_payment`]. This may be for an + /// [`InvoiceRequest`] sent for an [`Offer`] or for a [`Refund`] that hasn't been redeemed. + /// + /// [`ChannelManager::abandon_payment`]: crate::ln::channelmanager::ChannelManager::abandon_payment + /// [`InvoiceRequest`]: crate::offers::invoice_request::InvoiceRequest + /// [`Offer`]: crate::offers::offer::Offer + /// [`Refund`]: crate::offers::refund::Refund + InvoiceRequestFailed { + /// The `payment_id` to have been associated with payment for the requested invoice. + payment_id: PaymentId, }, /// Indicates an outbound payment we made succeeded (i.e. it made it all the way to its target /// and we got back the payment preimage for it). @@ -507,6 +597,11 @@ pub enum Event { /// payment is no longer retryable, due either to the [`Retry`] provided or /// [`ChannelManager::abandon_payment`] having been called for the corresponding payment. /// + /// In exceedingly rare cases, it is possible that an [`Event::PaymentFailed`] is generated for + /// a payment after an [`Event::PaymentSent`] event for this same payment has already been + /// received and processed. In this case, the [`Event::PaymentFailed`] event MUST be ignored, + /// and the payment MUST be treated as having succeeded. + /// /// [`Retry`]: crate::ln::channelmanager::Retry /// [`ChannelManager::abandon_payment`]: crate::ln::channelmanager::ChannelManager::abandon_payment PaymentFailed { @@ -673,16 +768,20 @@ pub enum Event { SpendableOutputs { /// The outputs which you should store as spendable by you. outputs: Vec, + /// The `channel_id` indicating which channel the spendable outputs belong to. + /// + /// This will always be `Some` for events generated by LDK versions 0.0.117 and above. + channel_id: Option, }, /// This event is generated when a payment has been successfully forwarded through us and a /// forwarding fee earned. PaymentForwarded { /// The incoming channel between the previous node and us. This is only `None` for events /// generated or serialized by versions prior to 0.0.107. - prev_channel_id: Option<[u8; 32]>, + prev_channel_id: Option, /// The outgoing channel between the next node and us. This is only `None` for events /// generated or serialized by versions prior to 0.0.107. - next_channel_id: Option<[u8; 32]>, + next_channel_id: Option, /// The fee, in milli-satoshis, which was earned as a result of the payment. /// /// Note that if we force-closed the channel over which we forwarded an HTLC while the HTLC @@ -713,7 +812,7 @@ pub enum Event { /// [`Event::ChannelReady`] event. ChannelPending { /// The `channel_id` of the channel that is pending confirmation. - channel_id: [u8; 32], + channel_id: ChannelId, /// The `user_channel_id` value passed in to [`ChannelManager::create_channel`] for outbound /// channels, or to [`ChannelManager::accept_inbound_channel`] for inbound channels if /// [`UserConfig::manually_accept_inbound_channels`] config flag is set to true. Otherwise @@ -726,7 +825,7 @@ pub enum Event { /// The `temporary_channel_id` this channel used to be known by during channel establishment. /// /// Will be `None` for channels created prior to LDK version 0.0.115. - former_temporary_channel_id: Option<[u8; 32]>, + former_temporary_channel_id: Option, /// The `node_id` of the channel counterparty. counterparty_node_id: PublicKey, /// The outpoint of the channel's funding transaction. @@ -738,7 +837,7 @@ pub enum Event { /// establishment. ChannelReady { /// The `channel_id` of the channel that is ready. - channel_id: [u8; 32], + channel_id: ChannelId, /// The `user_channel_id` value passed in to [`ChannelManager::create_channel`] for outbound /// channels, or to [`ChannelManager::accept_inbound_channel`] for inbound channels if /// [`UserConfig::manually_accept_inbound_channels`] config flag is set to true. Otherwise @@ -765,7 +864,7 @@ pub enum Event { ChannelClosed { /// The `channel_id` of the channel which has been closed. Note that on-chain transactions /// resolving the channel are likely still awaiting confirmation. - channel_id: [u8; 32], + channel_id: ChannelId, /// The `user_channel_id` value passed in to [`ChannelManager::create_channel`] for outbound /// channels, or to [`ChannelManager::accept_inbound_channel`] for inbound channels if /// [`UserConfig::manually_accept_inbound_channels`] config flag is set to true. Otherwise @@ -779,20 +878,22 @@ pub enum Event { user_channel_id: u128, /// The reason the channel was closed. reason: ClosureReason, - /// Counterparty in the closed channel. - /// + /// Counterparty in the closed channel. + /// /// This field will be `None` for objects serialized prior to LDK 0.0.117. counterparty_node_id: Option, - /// Channel capacity of the closing channel (sats). - /// + /// Channel capacity of the closing channel (sats). + /// /// This field will be `None` for objects serialized prior to LDK 0.0.117. channel_capacity_sats: Option, }, /// Used to indicate to the user that they can abandon the funding transaction and recycle the /// inputs for another purpose. + /// + /// This event is not guaranteed to be generated for channels that are closed due to a restart. DiscardFunding { /// The channel_id of the channel which has been closed. - channel_id: [u8; 32], + channel_id: ChannelId, /// The full transaction received from the user transaction: Transaction }, @@ -817,7 +918,7 @@ pub enum Event { /// /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel /// [`ChannelManager::force_close_without_broadcasting_txn`]: crate::ln::channelmanager::ChannelManager::force_close_without_broadcasting_txn - temporary_channel_id: [u8; 32], + temporary_channel_id: ChannelId, /// The node_id of the counterparty requesting to open the channel. /// /// When responding to the request, the `counterparty_node_id` should be passed @@ -863,7 +964,7 @@ pub enum Event { /// requirements (i.e. insufficient fees paid, or a CLTV that is too soon). HTLCHandlingFailed { /// The channel over which the HTLC was received. - prev_channel_id: [u8; 32], + prev_channel_id: ChannelId, /// Destination of the HTLC that failed to be processed. failed_next_destination: HTLCDestination, }, @@ -958,10 +1059,11 @@ impl Writeable for Event { // Note that we now ignore these on the read end as we'll re-generate them in // ChannelManager, we write them here only for backwards compatibility. }, - &Event::SpendableOutputs { ref outputs } => { + &Event::SpendableOutputs { ref outputs, channel_id } => { 5u8.write(writer)?; write_tlv_fields!(writer, { (0, WithoutLength(outputs), required), + (1, channel_id, option), }); }, &Event::HTLCIntercepted { requested_next_hop_scid, payment_hash, inbound_amount_msat, expected_outbound_amount_msat, intercept_id } => { @@ -988,8 +1090,8 @@ impl Writeable for Event { (5, outbound_amount_forwarded_msat, option), }); }, - &Event::ChannelClosed { ref channel_id, ref user_channel_id, ref reason, - ref counterparty_node_id, ref channel_capacity_sats + &Event::ChannelClosed { ref channel_id, ref user_channel_id, ref reason, + ref counterparty_node_id, ref channel_capacity_sats } => { 9u8.write(writer)?; // `user_channel_id` used to be a single u64 value. In order to remain backwards @@ -1035,13 +1137,15 @@ impl Writeable for Event { // We never write the OpenChannelRequest events as, upon disconnection, peers // drop any channels which have not yet exchanged funding_signed. }, - &Event::PaymentClaimed { ref payment_hash, ref amount_msat, ref purpose, ref receiver_node_id } => { + &Event::PaymentClaimed { ref payment_hash, ref amount_msat, ref purpose, ref receiver_node_id, ref htlcs, ref sender_intended_total_msat } => { 19u8.write(writer)?; write_tlv_fields!(writer, { (0, payment_hash, required), (1, receiver_node_id, option), (2, purpose, required), (4, amount_msat, required), + (5, *htlcs, optional_vec), + (7, sender_intended_total_msat, option), }); }, &Event::ProbeSuccessful { ref payment_id, ref payment_hash, ref path } => { @@ -1099,6 +1203,16 @@ impl Writeable for Event { (8, funding_txo, required), }); }, + &Event::InvoiceRequestFailed { ref payment_id } => { + 33u8.write(writer)?; + write_tlv_fields!(writer, { + (0, payment_id, required), + }) + }, + &Event::ConnectionNeeded { .. } => { + 35u8.write(writer)?; + // Never write ConnectionNeeded events as buffered onion messages aren't serialized. + }, // Note that, going forward, all new events must only write data inside of // `write_tlv_fields`. Versions 0.0.101+ will ignore odd-numbered events that write // data via `write_tlv_fields`. @@ -1109,8 +1223,7 @@ impl Writeable for Event { impl MaybeReadable for Event { fn read(reader: &mut R) -> Result, msgs::DecodeError> { match Readable::read(reader)? { - // Note that we do not write a length-prefixed TLV for FundingGenerationReady events, - // unlike all other events, thus we return immediately here. + // Note that we do not write a length-prefixed TLV for FundingGenerationReady events. 0u8 => Ok(None), 1u8 => { let f = || { @@ -1173,7 +1286,7 @@ impl MaybeReadable for Event { (5, fee_paid_msat, option), }); if payment_hash.is_none() { - payment_hash = Some(PaymentHash(Sha256::hash(&payment_preimage.0[..]).into_inner())); + payment_hash = Some(PaymentHash(Sha256::hash(&payment_preimage.0[..]).to_byte_array())); } Ok(Some(Event::PaymentSent { payment_id, @@ -1230,10 +1343,12 @@ impl MaybeReadable for Event { 5u8 => { let f = || { let mut outputs = WithoutLength(Vec::new()); + let mut channel_id: Option = None; read_tlv_fields!(reader, { (0, outputs, required), + (1, channel_id, option), }); - Ok(Some(Event::SpendableOutputs { outputs: outputs.0 })) + Ok(Some(Event::SpendableOutputs { outputs: outputs.0, channel_id })) }; f() }, @@ -1284,7 +1399,7 @@ impl MaybeReadable for Event { }, 9u8 => { let f = || { - let mut channel_id = [0; 32]; + let mut channel_id = ChannelId::new_zero(); let mut reason = UpgradableRequired(None); let mut user_channel_id_low_opt: Option = None; let mut user_channel_id_high_opt: Option = None; @@ -1312,8 +1427,8 @@ impl MaybeReadable for Event { }, 11u8 => { let f = || { - let mut channel_id = [0; 32]; - let mut transaction = Transaction{ version: 2, lock_time: PackedLockTime::ZERO, input: Vec::new(), output: Vec::new() }; + let mut channel_id = ChannelId::new_zero(); + let mut transaction = Transaction{ version: 2, lock_time: LockTime::ZERO, input: Vec::new(), output: Vec::new() }; read_tlv_fields!(reader, { (0, channel_id, required), (2, transaction, required), @@ -1324,7 +1439,7 @@ impl MaybeReadable for Event { }, 13u8 => { let f = || { - _init_and_read_tlv_fields!(reader, { + _init_and_read_len_prefixed_tlv_fields!(reader, { (0, payment_id, required), (2, payment_hash, option), (4, path, required_vec), @@ -1366,24 +1481,30 @@ impl MaybeReadable for Event { let mut purpose = UpgradableRequired(None); let mut amount_msat = 0; let mut receiver_node_id = None; + let mut htlcs: Option> = Some(vec![]); + let mut sender_intended_total_msat: Option = None; read_tlv_fields!(reader, { (0, payment_hash, required), (1, receiver_node_id, option), (2, purpose, upgradable_required), (4, amount_msat, required), + (5, htlcs, optional_vec), + (7, sender_intended_total_msat, option), }); Ok(Some(Event::PaymentClaimed { receiver_node_id, payment_hash, purpose: _init_tlv_based_struct_field!(purpose, upgradable_required), amount_msat, + htlcs: htlcs.unwrap_or(vec![]), + sender_intended_total_msat, })) }; f() }, 21u8 => { let f = || { - _init_and_read_tlv_fields!(reader, { + _init_and_read_len_prefixed_tlv_fields!(reader, { (0, payment_id, required), (2, payment_hash, required), (4, path, required_vec), @@ -1399,7 +1520,7 @@ impl MaybeReadable for Event { }, 23u8 => { let f = || { - _init_and_read_tlv_fields!(reader, { + _init_and_read_len_prefixed_tlv_fields!(reader, { (0, payment_id, required), (2, payment_hash, required), (4, path, required_vec), @@ -1417,7 +1538,7 @@ impl MaybeReadable for Event { }, 25u8 => { let f = || { - let mut prev_channel_id = [0; 32]; + let mut prev_channel_id = ChannelId::new_zero(); let mut failed_next_destination_opt = UpgradableRequired(None); read_tlv_fields!(reader, { (0, prev_channel_id, required), @@ -1433,7 +1554,7 @@ impl MaybeReadable for Event { 27u8 => Ok(None), 29u8 => { let f = || { - let mut channel_id = [0; 32]; + let mut channel_id = ChannelId::new_zero(); let mut user_channel_id: u128 = 0; let mut counterparty_node_id = RequiredWrapper(None); let mut channel_type = RequiredWrapper(None); @@ -1455,7 +1576,7 @@ impl MaybeReadable for Event { }, 31u8 => { let f = || { - let mut channel_id = [0; 32]; + let mut channel_id = ChannelId::new_zero(); let mut user_channel_id: u128 = 0; let mut former_temporary_channel_id = None; let mut counterparty_node_id = RequiredWrapper(None); @@ -1478,6 +1599,19 @@ impl MaybeReadable for Event { }; f() }, + 33u8 => { + let f = || { + _init_and_read_len_prefixed_tlv_fields!(reader, { + (0, payment_id, required), + }); + Ok(Some(Event::InvoiceRequestFailed { + payment_id: payment_id.0.unwrap(), + })) + }; + f() + }, + // Note that we do not write a length-prefixed TLV for ConnectionNeeded events. + 35u8 => Ok(None), // Versions prior to 0.0.100 did not ignore odd types, instead returning InvalidValue. // Version 0.0.100 failed to properly ignore odd types, possibly resulting in corrupt // reads. @@ -1549,6 +1683,34 @@ pub enum MessageSendEvent { /// The message which should be sent. msg: msgs::FundingSigned, }, + /// Used to indicate that a stfu message should be sent to the peer with the given node id. + SendStfu { + /// The node_id of the node which should receive this message + node_id: PublicKey, + /// The message which should be sent. + msg: msgs::Stfu, + }, + /// Used to indicate that a splice message should be sent to the peer with the given node id. + SendSplice { + /// The node_id of the node which should receive this message + node_id: PublicKey, + /// The message which should be sent. + msg: msgs::Splice, + }, + /// Used to indicate that a splice_ack message should be sent to the peer with the given node id. + SendSpliceAck { + /// The node_id of the node which should receive this message + node_id: PublicKey, + /// The message which should be sent. + msg: msgs::SpliceAck, + }, + /// Used to indicate that a splice_locked message should be sent to the peer with the given node id. + SendSpliceLocked { + /// The node_id of the node which should receive this message + node_id: PublicKey, + /// The message which should be sent. + msg: msgs::SpliceLocked, + }, /// Used to indicate that a tx_add_input message should be sent to the peer with the given node_id. SendTxAddInput { /// The node_id of the node which should receive this message @@ -1610,7 +1772,7 @@ pub enum MessageSendEvent { /// The node_id of the node which should receive this message node_id: PublicKey, /// The message which should be sent. - msg: msgs::TxAddInput, + msg: msgs::TxAbort, }, /// Used to indicate that a channel_ready message should be sent to the peer with the given node_id. SendChannelReady { @@ -1754,12 +1916,6 @@ pub trait MessageSendEventsProvider { fn get_and_clear_pending_msg_events(&self) -> Vec; } -/// A trait indicating an object may generate onion messages to send -pub trait OnionMessageProvider { - /// Gets the next pending onion message for the peer with the given node id. - fn next_onion_message_for_peer(&self, peer_node_id: PublicKey) -> Option; -} - /// A trait indicating an object may generate events. /// /// Events are processed by passing an [`EventHandler`] to [`process_pending_events`].