current_chain_height: u32,
outbound_scid_alias: u64,
temporary_channel_id: Option<ChannelId>,
- channel_type: ChannelTypeFeatures,
+ holder_selected_channel_reserve_satoshis: u64,
+ channel_keys_id: [u8; 32],
+ holder_signer: <SP::Target as SignerProvider>::EcdsaSigner,
+ pubkeys: ChannelPublicKeys,
) -> Result<ChannelContext<SP>, APIError>
where
ES::Target: EntropySource,
let channel_value_satoshis = funding_satoshis;
let holder_selected_contest_delay = config.channel_handshake_config.our_to_self_delay;
- let channel_keys_id = signer_provider.generate_channel_keys_id(false, channel_value_satoshis, user_id);
- let holder_signer = signer_provider.derive_channel_signer(channel_value_satoshis, channel_keys_id);
- let pubkeys = holder_signer.pubkeys().clone();
if !their_features.supports_wumbo() && channel_value_satoshis > MAX_FUNDING_SATOSHIS_NO_WUMBO {
return Err(APIError::APIMisuseError{err: format!("funding_value must not exceed {}, it was {}", MAX_FUNDING_SATOSHIS_NO_WUMBO, channel_value_satoshis)});
if holder_selected_contest_delay < BREAKDOWN_TIMEOUT {
return Err(APIError::APIMisuseError {err: format!("Configured with an unreasonable our_to_self_delay ({}) putting user funds at risks", holder_selected_contest_delay)});
}
- let holder_selected_channel_reserve_satoshis = get_holder_selected_channel_reserve_satoshis(channel_value_satoshis, config);
- if holder_selected_channel_reserve_satoshis < MIN_CHAN_DUST_LIMIT_SATOSHIS {
- // Protocol level safety check in place, although it should never happen because
- // of `MIN_THEIR_CHAN_RESERVE_SATOSHIS`
- return Err(APIError::APIMisuseError { err: format!("Holder selected channel reserve below implemention limit dust_limit_satoshis {}", holder_selected_channel_reserve_satoshis) });
- }
+ let channel_type = get_initial_channel_type(&config, their_features);
debug_assert!(channel_type.is_subset(&channelmanager::provided_channel_type_features(&config)));
let (commitment_conf_target, anchor_outputs_value_msat) = if channel_type.supports_anchors_zero_fee_htlc_tx() {
channel_state: ChannelState::NegotiatingFunding(NegotiatingFundingFlags::OUR_INIT_SENT),
announcement_sigs_state: AnnouncementSigsState::NotSent,
secp_ctx,
+ // We'll add our counterparty's `funding_satoshis` when we receive `accept_channel2`.
channel_value_satoshis,
latest_monitor_update_id: 0,
signer_pending_commitment_update: false,
signer_pending_funding: false,
+ // We'll add our counterparty's `funding_satoshis` to these max commitment output assertions
+ // when we receive `accept_channel2`.
#[cfg(debug_assertions)]
holder_max_commitment_tx_output: Mutex::new((channel_value_satoshis * 1000 - push_msat, push_msat)),
#[cfg(debug_assertions)]
counterparty_dust_limit_satoshis: 0,
holder_dust_limit_satoshis: MIN_CHAN_DUST_LIMIT_SATOSHIS,
counterparty_max_htlc_value_in_flight_msat: 0,
+ // We'll adjust this to include our counterparty's `funding_satoshis` when we
+ // receive `accept_channel2`.
holder_max_htlc_value_in_flight_msat: get_holder_max_htlc_value_in_flight_msat(channel_value_satoshis, &config.channel_handshake_config),
counterparty_selected_channel_reserve_satoshis: None, // Filled in in accept_channel
holder_selected_channel_reserve_satoshis,
///
/// This is used both for outbound and inbound channels and has lower bound
/// of `dust_limit_satoshis`.
+#[cfg(dual_funding)]
fn get_v2_channel_reserve_satoshis(channel_value_satoshis: u64, dust_limit_satoshis: u64) -> u64 {
// Fixed at 1% of channel value by spec.
let (q, _) = channel_value_satoshis.overflowing_div(100);
where ES::Target: EntropySource,
F::Target: FeeEstimator
{
- let channel_type = Self::get_initial_channel_type(&config, their_features);
+ let holder_selected_channel_reserve_satoshis = get_holder_selected_channel_reserve_satoshis(channel_value_satoshis, config);
+ if holder_selected_channel_reserve_satoshis < MIN_CHAN_DUST_LIMIT_SATOSHIS {
+ // Protocol level safety check in place, although it should never happen because
+ // of `MIN_THEIR_CHAN_RESERVE_SATOSHIS`
+ return Err(APIError::APIMisuseError { err: format!("Holder selected channel reserve below \
+ implemention limit dust_limit_satoshis {}", holder_selected_channel_reserve_satoshis) });
+ }
+
+ let channel_keys_id = signer_provider.generate_channel_keys_id(false, channel_value_satoshis, user_id);
+ let holder_signer = signer_provider.derive_channel_signer(channel_value_satoshis, channel_keys_id);
+ let pubkeys = holder_signer.pubkeys().clone();
let chan = Self {
context: ChannelContext::new_for_outbound_channel(
current_chain_height,
outbound_scid_alias,
temporary_channel_id,
- channel_type,
+ holder_selected_channel_reserve_satoshis,
+ channel_keys_id,
+ holder_signer,
+ pubkeys,
)?,
unfunded_context: UnfundedChannelContext { unfunded_channel_age_ticks: 0 }
};
Ok(funding_created)
}
- fn get_initial_channel_type(config: &UserConfig, their_features: &InitFeatures) -> ChannelTypeFeatures {
- // The default channel type (ie the first one we try) depends on whether the channel is
- // public - if it is, we just go with `only_static_remotekey` as it's the only option
- // available. If it's private, we first try `scid_privacy` as it provides better privacy
- // with no other changes, and fall back to `only_static_remotekey`.
- let mut ret = ChannelTypeFeatures::only_static_remote_key();
- if !config.channel_handshake_config.announced_channel &&
- config.channel_handshake_config.negotiate_scid_privacy &&
- their_features.supports_scid_privacy() {
- ret.set_scid_privacy_required();
- }
-
- // Optionally, if the user would like to negotiate the `anchors_zero_fee_htlc_tx` option, we
- // set it now. If they don't understand it, we'll fall back to our default of
- // `only_static_remotekey`.
- if config.channel_handshake_config.negotiate_anchors_zero_fee_htlc_tx &&
- their_features.supports_anchors_zero_fee_htlc_tx() {
- ret.set_anchors_zero_fee_htlc_tx_required();
- }
-
- ret
- }
-
/// If we receive an error message, it may only be a rejection of the channel type we tried,
/// not of our ability to open any channel at all. Thus, on error, we should first call this
/// and see if we get a new `OpenChannel` message, otherwise the channel is failed.
}
}
+// A not-yet-funded outbound (from holder) channel using V2 channel establishment.
+#[cfg(dual_funding)]
+pub(super) struct OutboundV2Channel<SP: Deref> where SP::Target: SignerProvider {
+ pub context: ChannelContext<SP>,
+ pub unfunded_context: UnfundedChannelContext,
+ #[cfg(dual_funding)]
+ pub dual_funding_context: DualFundingChannelContext,
+}
+
+#[cfg(dual_funding)]
+impl<SP: Deref> OutboundV2Channel<SP> where SP::Target: SignerProvider {
+ pub fn new<ES: Deref, F: Deref>(
+ fee_estimator: &LowerBoundedFeeEstimator<F>, entropy_source: &ES, signer_provider: &SP,
+ counterparty_node_id: PublicKey, their_features: &InitFeatures, funding_satoshis: u64,
+ user_id: u128, config: &UserConfig, current_chain_height: u32, outbound_scid_alias: u64,
+ funding_confirmation_target: ConfirmationTarget,
+ ) -> Result<OutboundV2Channel<SP>, APIError>
+ where ES::Target: EntropySource,
+ F::Target: FeeEstimator,
+ {
+ let channel_keys_id = signer_provider.generate_channel_keys_id(false, funding_satoshis, user_id);
+ let holder_signer = signer_provider.derive_channel_signer(funding_satoshis, channel_keys_id);
+ let pubkeys = holder_signer.pubkeys().clone();
+
+ let temporary_channel_id = Some(ChannelId::temporary_v2_from_revocation_basepoint(&pubkeys.revocation_basepoint));
+
+ let holder_selected_channel_reserve_satoshis = get_v2_channel_reserve_satoshis(
+ funding_satoshis, MIN_CHAN_DUST_LIMIT_SATOSHIS);
+
+ let funding_feerate_sat_per_1000_weight = fee_estimator.bounded_sat_per_1000_weight(funding_confirmation_target);
+ let funding_tx_locktime = current_chain_height;
+
+ let chan = Self {
+ context: ChannelContext::new_for_outbound_channel(
+ fee_estimator,
+ entropy_source,
+ signer_provider,
+ counterparty_node_id,
+ their_features,
+ funding_satoshis,
+ 0,
+ user_id,
+ config,
+ current_chain_height,
+ outbound_scid_alias,
+ temporary_channel_id,
+ holder_selected_channel_reserve_satoshis,
+ channel_keys_id,
+ holder_signer,
+ pubkeys,
+ )?,
+ unfunded_context: UnfundedChannelContext { unfunded_channel_age_ticks: 0 },
+ dual_funding_context: DualFundingChannelContext {
+ our_funding_satoshis: funding_satoshis,
+ their_funding_satoshis: 0,
+ funding_tx_locktime,
+ funding_feerate_sat_per_1000_weight,
+ }
+ };
+ Ok(chan)
+ }
+
+ pub fn get_open_channel_v2(&self, chain_hash: ChainHash) -> msgs::OpenChannelV2 {
+ if self.context.have_received_message() {
+ debug_assert!(false, "Cannot generate an open_channel2 after we've moved forward");
+ }
+
+ if self.context.cur_holder_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER {
+ debug_assert!(false, "Tried to send an open_channel2 for a channel that has already advanced");
+ }
+
+ let first_per_commitment_point = self.context.holder_signer.as_ref()
+ .get_per_commitment_point(self.context.cur_holder_commitment_transaction_number,
+ &self.context.secp_ctx);
+ let second_per_commitment_point = self.context.holder_signer.as_ref()
+ .get_per_commitment_point(self.context.cur_holder_commitment_transaction_number - 1,
+ &self.context.secp_ctx);
+ let keys = self.context.get_holder_pubkeys();
+
+ msgs::OpenChannelV2 {
+ common_fields: msgs::CommonOpenChannelFields {
+ chain_hash,
+ temporary_channel_id: self.context.temporary_channel_id.unwrap(),
+ funding_satoshis: self.context.channel_value_satoshis,
+ dust_limit_satoshis: self.context.holder_dust_limit_satoshis,
+ max_htlc_value_in_flight_msat: self.context.holder_max_htlc_value_in_flight_msat,
+ htlc_minimum_msat: self.context.holder_htlc_minimum_msat,
+ commitment_feerate_sat_per_1000_weight: self.context.feerate_per_kw,
+ to_self_delay: self.context.get_holder_selected_contest_delay(),
+ max_accepted_htlcs: self.context.holder_max_accepted_htlcs,
+ funding_pubkey: keys.funding_pubkey,
+ revocation_basepoint: keys.revocation_basepoint.to_public_key(),
+ payment_basepoint: keys.payment_point,
+ delayed_payment_basepoint: keys.delayed_payment_basepoint.to_public_key(),
+ htlc_basepoint: keys.htlc_basepoint.to_public_key(),
+ first_per_commitment_point,
+ channel_flags: if self.context.config.announced_channel {1} else {0},
+ shutdown_scriptpubkey: Some(match &self.context.shutdown_scriptpubkey {
+ Some(script) => script.clone().into_inner(),
+ None => Builder::new().into_script(),
+ }),
+ channel_type: Some(self.context.channel_type.clone()),
+ },
+ funding_feerate_sat_per_1000_weight: self.context.feerate_per_kw,
+ second_per_commitment_point,
+ locktime: self.dual_funding_context.funding_tx_locktime,
+ require_confirmed_inputs: None,
+ }
+ }
+}
+
// A not-yet-funded inbound (from counterparty) channel using V2 channel establishment.
#[cfg(dual_funding)]
pub(super) struct InboundV2Channel<SP: Deref> where SP::Target: SignerProvider {
}
}
+// Unfunded channel utilities
+
+fn get_initial_channel_type(config: &UserConfig, their_features: &InitFeatures) -> ChannelTypeFeatures {
+ // The default channel type (ie the first one we try) depends on whether the channel is
+ // public - if it is, we just go with `only_static_remotekey` as it's the only option
+ // available. If it's private, we first try `scid_privacy` as it provides better privacy
+ // with no other changes, and fall back to `only_static_remotekey`.
+ let mut ret = ChannelTypeFeatures::only_static_remote_key();
+ if !config.channel_handshake_config.announced_channel &&
+ config.channel_handshake_config.negotiate_scid_privacy &&
+ their_features.supports_scid_privacy() {
+ ret.set_scid_privacy_required();
+ }
+
+ // Optionally, if the user would like to negotiate the `anchors_zero_fee_htlc_tx` option, we
+ // set it now. If they don't understand it, we'll fall back to our default of
+ // `only_static_remotekey`.
+ if config.channel_handshake_config.negotiate_anchors_zero_fee_htlc_tx &&
+ their_features.supports_anchors_zero_fee_htlc_tx() {
+ ret.set_anchors_zero_fee_htlc_tx_required();
+ }
+
+ ret
+}
+
const SERIALIZATION_VERSION: u8 = 3;
const MIN_SERIALIZATION_VERSION: u8 = 3;
projects / rust-lightning / commitdiff