From ef5be580f51d6756612fea710516c0297203f4dc Mon Sep 17 00:00:00 2001 From: Willem Van Lint Date: Sat, 5 Aug 2023 17:26:49 -0700 Subject: [PATCH] Remove AvailableBalances::balance_msat The ChannelMonitor::get_claimable_balances method provides a more straightforward approach to the balance of a channel, which satisfies most use cases. The computation of AvailableBalances::balance_msat is complex and originally had a different purpose that is not applicable anymore. --- fuzz/src/router.rs | 1 - lightning/src/chain/chainmonitor.rs | 3 +-- lightning/src/ln/channel.rs | 11 -------- lightning/src/ln/channelmanager.rs | 31 +++++++++-------------- lightning/src/routing/router.rs | 2 -- pending_changelog/remove_balance_msat.txt | 1 + 6 files changed, 14 insertions(+), 35 deletions(-) create mode 100644 pending_changelog/remove_balance_msat.txt diff --git a/fuzz/src/router.rs b/fuzz/src/router.rs index 65349102..6195e736 100644 --- a/fuzz/src/router.rs +++ b/fuzz/src/router.rs @@ -232,7 +232,6 @@ pub fn do_test(data: &[u8], out: Out) { force_close_spend_delay: None, is_outbound: true, is_channel_ready: true, is_usable: true, is_public: true, - balance_msat: 0, outbound_capacity_msat: capacity.saturating_mul(1000), next_outbound_htlc_limit_msat: capacity.saturating_mul(1000), next_outbound_htlc_minimum_msat: 0, diff --git a/lightning/src/chain/chainmonitor.rs b/lightning/src/chain/chainmonitor.rs index 4514a65c..de50f577 100644 --- a/lightning/src/chain/chainmonitor.rs +++ b/lightning/src/chain/chainmonitor.rs @@ -364,8 +364,7 @@ where C::Target: chain::Filter, /// claims which are awaiting confirmation. /// /// Includes the balances from each [`ChannelMonitor`] *except* those included in - /// `ignored_channels`, allowing you to filter out balances from channels which are still open - /// (and whose balance should likely be pulled from the [`ChannelDetails`]). + /// `ignored_channels`. /// /// See [`ChannelMonitor::get_claimable_balances`] for more details on the exact criteria for /// inclusion in the return value. diff --git a/lightning/src/ln/channel.rs b/lightning/src/ln/channel.rs index 1978467b..ea7cc1d4 100644 --- a/lightning/src/ln/channel.rs +++ b/lightning/src/ln/channel.rs @@ -65,8 +65,6 @@ pub struct ChannelValueStat { } pub struct AvailableBalances { - /// The amount that would go to us if we close the channel, ignoring any on-chain fees. - pub balance_msat: u64, /// Total amount available for our counterparty to send to us. pub inbound_capacity_msat: u64, /// Total amount available for us to send to our counterparty. @@ -1611,14 +1609,6 @@ impl ChannelContext { let inbound_stats = context.get_inbound_pending_htlc_stats(None); let outbound_stats = context.get_outbound_pending_htlc_stats(None); - let mut balance_msat = context.value_to_self_msat; - for ref htlc in context.pending_inbound_htlcs.iter() { - if let InboundHTLCState::LocalRemoved(InboundHTLCRemovalReason::Fulfill(_)) = htlc.state { - balance_msat += htlc.amount_msat; - } - } - balance_msat -= outbound_stats.pending_htlcs_value_msat; - let outbound_capacity_msat = context.value_to_self_msat .saturating_sub(outbound_stats.pending_htlcs_value_msat) .saturating_sub( @@ -1735,7 +1725,6 @@ impl ChannelContext { outbound_capacity_msat, next_outbound_htlc_limit_msat: available_capacity_msat, next_outbound_htlc_minimum_msat, - balance_msat, } } diff --git a/lightning/src/ln/channelmanager.rs b/lightning/src/ln/channelmanager.rs index b7c7e033..94bbcf2a 100644 --- a/lightning/src/ln/channelmanager.rs +++ b/lightning/src/ln/channelmanager.rs @@ -1357,6 +1357,12 @@ pub struct ChannelCounterparty { } /// Details of a channel, as returned by [`ChannelManager::list_channels`] and [`ChannelManager::list_usable_channels`] +/// +/// Balances of a channel are available through [`ChainMonitor::get_claimable_balances`] and +/// [`ChannelMonitor::get_claimable_balances`], calculated with respect to the corresponding on-chain +/// transactions. +/// +/// [`ChainMonitor::get_claimable_balances`]: crate::chain::chainmonitor::ChainMonitor::get_claimable_balances #[derive(Clone, Debug, PartialEq)] pub struct ChannelDetails { /// The channel's ID (prior to funding transaction generation, this is a random 32 bytes, @@ -1432,24 +1438,11 @@ pub struct ChannelDetails { /// /// This value will be `None` for objects serialized with LDK versions prior to 0.0.115. pub feerate_sat_per_1000_weight: Option, - /// Our total balance. This is the amount we would get if we close the channel. - /// This value is not exact. Due to various in-flight changes and feerate changes, exactly this - /// amount is not likely to be recoverable on close. - /// - /// This does not include any pending HTLCs which are not yet fully resolved (and, thus, whose - /// balance is not available for inclusion in new outbound HTLCs). This further does not include - /// any pending outgoing HTLCs which are awaiting some other resolution to be sent. - /// This does not consider any on-chain fees. - /// - /// See also [`ChannelDetails::outbound_capacity_msat`] - pub balance_msat: u64, /// The available outbound capacity for sending HTLCs to the remote peer. This does not include /// any pending HTLCs which are not yet fully resolved (and, thus, whose balance is not /// available for inclusion in new outbound HTLCs). This further does not include any pending /// outgoing HTLCs which are awaiting some other resolution to be sent. /// - /// See also [`ChannelDetails::balance_msat`] - /// /// This value is not exact. Due to various in-flight changes, feerate changes, and our /// conflict-avoidance policy, exactly this amount is not likely to be spendable. However, we /// should be able to spend nearly this amount. @@ -1459,8 +1452,8 @@ pub struct ChannelDetails { /// the current state and per-HTLC limit(s). This is intended for use when routing, allowing us /// to use a limit as close as possible to the HTLC limit we can currently send. /// - /// See also [`ChannelDetails::next_outbound_htlc_minimum_msat`], - /// [`ChannelDetails::balance_msat`], and [`ChannelDetails::outbound_capacity_msat`]. + /// See also [`ChannelDetails::next_outbound_htlc_minimum_msat`] and + /// [`ChannelDetails::outbound_capacity_msat`]. pub next_outbound_htlc_limit_msat: u64, /// The minimum value for sending a single HTLC to the remote peer. This is the equivalent of /// [`ChannelDetails::next_outbound_htlc_limit_msat`] but represents a lower-bound, rather than @@ -1588,7 +1581,6 @@ impl ChannelDetails { channel_value_satoshis: context.get_value_satoshis(), feerate_sat_per_1000_weight: Some(context.get_feerate_sat_per_1000_weight()), unspendable_punishment_reserve: to_self_reserve_satoshis, - balance_msat: balance.balance_msat, inbound_capacity_msat: balance.inbound_capacity_msat, outbound_capacity_msat: balance.outbound_capacity_msat, next_outbound_htlc_limit_msat: balance.next_outbound_htlc_limit_msat, @@ -7621,7 +7613,7 @@ impl Writeable for ChannelDetails { (10, self.channel_value_satoshis, required), (12, self.unspendable_punishment_reserve, option), (14, user_channel_id_low, required), - (16, self.balance_msat, required), + (16, self.next_outbound_htlc_limit_msat, required), // Forwards compatibility for removed balance_msat field. (18, self.outbound_capacity_msat, required), (19, self.next_outbound_htlc_limit_msat, required), (20, self.inbound_capacity_msat, required), @@ -7657,7 +7649,7 @@ impl Readable for ChannelDetails { (10, channel_value_satoshis, required), (12, unspendable_punishment_reserve, option), (14, user_channel_id_low, required), - (16, balance_msat, required), + (16, _balance_msat, option), // Backwards compatibility for removed balance_msat field. (18, outbound_capacity_msat, required), // Note that by the time we get past the required read above, outbound_capacity_msat will be // filled in, so we can safely unwrap it here. @@ -7683,6 +7675,8 @@ impl Readable for ChannelDetails { let user_channel_id = user_channel_id_low as u128 + ((user_channel_id_high_opt.unwrap_or(0 as u64) as u128) << 64); + let _balance_msat: Option = _balance_msat; + Ok(Self { inbound_scid_alias, channel_id: channel_id.0.unwrap(), @@ -7695,7 +7689,6 @@ impl Readable for ChannelDetails { channel_value_satoshis: channel_value_satoshis.0.unwrap(), unspendable_punishment_reserve, user_channel_id, - balance_msat: balance_msat.0.unwrap(), outbound_capacity_msat: outbound_capacity_msat.0.unwrap(), next_outbound_htlc_limit_msat: next_outbound_htlc_limit_msat.0.unwrap(), next_outbound_htlc_minimum_msat: next_outbound_htlc_minimum_msat.0.unwrap(), diff --git a/lightning/src/routing/router.rs b/lightning/src/routing/router.rs index b4316165..04fc9927 100644 --- a/lightning/src/routing/router.rs +++ b/lightning/src/routing/router.rs @@ -2725,7 +2725,6 @@ mod tests { inbound_scid_alias: None, channel_value_satoshis: 0, user_channel_id: 0, - balance_msat: 0, outbound_capacity_msat, next_outbound_htlc_limit_msat: outbound_capacity_msat, next_outbound_htlc_minimum_msat: 0, @@ -6794,7 +6793,6 @@ pub(crate) mod bench_utils { outbound_scid_alias: None, channel_value_satoshis: 10_000_000_000, user_channel_id: 0, - balance_msat: 10_000_000_000, outbound_capacity_msat: 10_000_000_000, next_outbound_htlc_minimum_msat: 0, next_outbound_htlc_limit_msat: 10_000_000_000, diff --git a/pending_changelog/remove_balance_msat.txt b/pending_changelog/remove_balance_msat.txt new file mode 100644 index 00000000..2ba5df1f --- /dev/null +++ b/pending_changelog/remove_balance_msat.txt @@ -0,0 +1 @@ +* The `AvailableBalances::balance_msat` field has been removed in favor of `ChannelMonitor::get_claimable_balances`. `ChannelDetails` serialized with versions of LDK >= 0.0.117 will have their `balance_msat` field set to `next_outbound_htlc_limit_msat` when read by versions of LDK prior to 0.0.117 (#2476). -- 2.30.2