Merge pull request lightningdevkit#3019 from benthecarman/is-public

Add more information to OpenChannelRequest Event

Author: TheBlueMatt

Diff for: lightning/src/events/mod.rs

@@ -1308,6 +1308,10 @@ pub enum Event {
 		///
 		/// [`ChannelManager`]: crate::ln::channelmanager::ChannelManager
 		channel_type: ChannelTypeFeatures,
+		/// True if this channel is (or will be) publicly-announced.
+		is_public: bool,
+		/// Channel parameters given by the counterparty.
+		params: msgs::ChannelParameters,
 	},
 	/// Indicates that the HTLC was accepted, but could not be processed when or after attempting to
 	/// forward it.

Diff for: lightning/src/ln/channelmanager.rs

@@ -7392,12 +7392,15 @@ where
 					MsgHandleErrInternal::from_chan_no_close(e, msg.common_fields.temporary_channel_id)
 				)?;
 			let mut pending_events = self.pending_events.lock().unwrap();
+			let is_public = (msg.common_fields.channel_flags & 1) == 1;
 			pending_events.push_back((events::Event::OpenChannelRequest {
 				temporary_channel_id: msg.common_fields.temporary_channel_id.clone(),
 				counterparty_node_id: counterparty_node_id.clone(),
 				funding_satoshis: msg.common_fields.funding_satoshis,
 				push_msat: msg.push_msat,
 				channel_type,
+				is_public,
+				params: msg.common_fields.channel_parameters(),
 			}, None));
 			peer_state.inbound_channel_request_by_id.insert(channel_id, InboundChannelRequest {
 				open_channel_msg: msg.clone(),

Diff for: lightning/src/ln/msgs.rs

@@ -237,6 +237,41 @@ pub struct CommonOpenChannelFields {
 	pub channel_type: Option<ChannelTypeFeatures>,
 }
 
+impl CommonOpenChannelFields {
+	/// The [`ChannelParameters`] for this channel.
+	pub fn channel_parameters(&self) -> ChannelParameters {
+		ChannelParameters {
+			dust_limit_satoshis: self.dust_limit_satoshis,
+			max_htlc_value_in_flight_msat: self.max_htlc_value_in_flight_msat,
+			htlc_minimum_msat: self.htlc_minimum_msat,
+			commitment_feerate_sat_per_1000_weight: self.commitment_feerate_sat_per_1000_weight,
+			to_self_delay: self.to_self_delay,
+			max_accepted_htlcs: self.max_accepted_htlcs,
+		}
+	}
+}
+
+/// A subset of [`CommonOpenChannelFields`], containing various parameters which are set by the
+/// counterparty and which are not part of the channel funding transaction.
+#[derive(Clone, Debug, Hash, PartialEq, Eq)]
+pub struct ChannelParameters {
+	/// The threshold below which outputs on transactions broadcast by the channel initiator will be
+	/// omitted
+	pub dust_limit_satoshis: u64,
+	/// The maximum inbound HTLC value in flight towards channel initiator, in milli-satoshi
+	pub max_htlc_value_in_flight_msat: u64,
+	/// The minimum HTLC size incoming to channel initiator, in milli-satoshi
+	pub htlc_minimum_msat: u64,
+	/// The feerate for the commitment transaction set by the channel initiator until updated by
+	/// [`UpdateFee`]
+	pub commitment_feerate_sat_per_1000_weight: u32,
+	/// The number of blocks which the counterparty will have to wait to claim on-chain funds if they
+	/// broadcast a commitment transaction
+	pub to_self_delay: u16,
+	/// The maximum number of inbound HTLCs towards channel initiator
+	pub max_accepted_htlcs: u16,
+}
+
 /// An [`open_channel`] message to be sent to or received from a peer.
 ///
 /// Used in V1 channel establishment