Add interactive tx constructor to all V2-related channel structs

Here we add the `interactive_tx_constructor` field to the `Channel`,
`OutboundV2Channel`, and `InboundV2Channel` structs.

Author: dunxen

lightning/src/ln/channel.rs

@@ -28,6 +28,7 @@ use bitcoin::secp256k1;
 use crate::ln::types::ChannelId;
 use crate::types::payment::{PaymentPreimage, PaymentHash};
 use crate::types::features::{ChannelTypeFeatures, InitFeatures};
+use crate::ln::interactivetxs::InteractiveTxConstructor;
 use crate::ln::msgs;
 use crate::ln::msgs::{ClosingSigned, ClosingSignedFeeRange, DecodeError};
 use crate::ln::script::{self, ShutdownScript};
@@ -8132,7 +8133,7 @@ impl<SP: Deref> InboundV1Channel<SP> where SP::Target: SignerProvider {
 				msg.push_msat,
 				msg.common_fields.clone(),
 			)?,
-			unfunded_context: UnfundedChannelContext { unfunded_channel_age_ticks: 0 }
+			unfunded_context: UnfundedChannelContext { unfunded_channel_age_ticks: 0 },
 		};
 		Ok(chan)
 	}
@@ -8266,6 +8267,8 @@ pub(super) struct OutboundV2Channel<SP: Deref> where SP::Target: SignerProvider
 	pub context: ChannelContext<SP>,
 	pub unfunded_context: UnfundedChannelContext,
 	pub dual_funding_context: DualFundingChannelContext,
+	/// The current interactive transaction construction session under negotiation.
+	interactive_tx_constructor: Option<InteractiveTxConstructor>,
 }
 
 impl<SP: Deref> OutboundV2Channel<SP> where SP::Target: SignerProvider {
@@ -8317,7 +8320,8 @@ impl<SP: Deref> OutboundV2Channel<SP> where SP::Target: SignerProvider {
 				their_funding_satoshis: 0,
 				funding_tx_locktime,
 				funding_feerate_sat_per_1000_weight,
-			}
+			},
+			interactive_tx_constructor: None,
 		};
 		Ok(chan)
 	}
@@ -8391,6 +8395,8 @@ pub(super) struct InboundV2Channel<SP: Deref> where SP::Target: SignerProvider {
 	pub context: ChannelContext<SP>,
 	pub unfunded_context: UnfundedChannelContext,
 	pub dual_funding_context: DualFundingChannelContext,
+	/// The current interactive transaction construction session under negotiation.
+	interactive_tx_constructor: Option<InteractiveTxConstructor>,
 }
 
 impl<SP: Deref> InboundV2Channel<SP> where SP::Target: SignerProvider {
@@ -8462,7 +8468,8 @@ impl<SP: Deref> InboundV2Channel<SP> where SP::Target: SignerProvider {
 				their_funding_satoshis: msg.common_fields.funding_satoshis,
 				funding_tx_locktime: msg.locktime,
 				funding_feerate_sat_per_1000_weight: msg.funding_feerate_sat_per_1000_weight,
-			}
+			},
+			interactive_tx_constructor: None,
 		};
 
 		Ok(chan)