From 5e84db40a723fc0288455932e798594422ed510d Mon Sep 17 00:00:00 2001
From: Elias Rohrer <dev@tnull.de>
Date: Tue, 10 Dec 2024 14:27:59 +0100
Subject: [PATCH] WIP Add `LSPS2ServiceEvent` handling

.. so far with dummy values, we'll have to discuss how the API should
look like.
---
 src/liquidity.rs | 111 ++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 109 insertions(+), 2 deletions(-)

diff --git a/src/liquidity.rs b/src/liquidity.rs
index 21164290c..85df83747 100644
--- a/src/liquidity.rs
+++ b/src/liquidity.rs
@@ -28,8 +28,8 @@ use lightning_liquidity::lsps1::msgs::{
 	ChannelInfo, LSPS1Options, OrderId, OrderParameters, PaymentInfo,
 };
 use lightning_liquidity::lsps2::client::LSPS2ClientConfig;
-use lightning_liquidity::lsps2::event::LSPS2ClientEvent;
-use lightning_liquidity::lsps2::msgs::OpeningFeeParams;
+use lightning_liquidity::lsps2::event::{LSPS2ClientEvent, LSPS2ServiceEvent};
+use lightning_liquidity::lsps2::msgs::{OpeningFeeParams, RawOpeningFeeParams};
 use lightning_liquidity::lsps2::service::LSPS2ServiceConfig;
 use lightning_liquidity::lsps2::utils::compute_opening_fee;
 use lightning_liquidity::{LiquidityClientConfig, LiquidityServiceConfig};
@@ -39,6 +39,8 @@ use bitcoin::secp256k1::{PublicKey, Secp256k1};
 
 use tokio::sync::oneshot;
 
+use chrono::{DateTime, Utc};
+
 use std::collections::HashMap;
 use std::ops::Deref;
 use std::sync::{Arc, Mutex, RwLock};
@@ -397,6 +399,111 @@ where
 					log_error!(self.logger, "Received unexpected LSPS1Client::OrderStatus event!");
 				}
 			},
+			Event::LSPS2Service(LSPS2ServiceEvent::GetInfo {
+				request_id,
+				counterparty_node_id,
+				token: _,
+			}) => {
+				if let Some(lsps2_service_handler) =
+					self.liquidity_manager.lsps2_service_handler().as_ref()
+				{
+					let min_fee_msat = 0;
+					let proportional = 0;
+					let mut valid_until: DateTime<Utc> = Utc::now();
+					valid_until += chrono::Duration::minutes(10);
+					let min_lifetime = 1008;
+					let max_client_to_self_delay = 144;
+					let min_payment_size_msat = 1000;
+					let max_payment_size_msat = 10_000_000_000;
+
+					let opening_fee_params = RawOpeningFeeParams {
+						min_fee_msat,
+						proportional,
+						valid_until,
+						min_lifetime,
+						max_client_to_self_delay,
+						min_payment_size_msat,
+						max_payment_size_msat,
+					};
+
+					let opening_fee_params_menu = vec![opening_fee_params];
+
+					if let Err(e) = lsps2_service_handler.opening_fee_params_generated(
+						&counterparty_node_id,
+						request_id,
+						opening_fee_params_menu,
+					) {
+						log_error!(
+							self.logger,
+							"Failed to handle generated opening fee params: {:?}",
+							e
+						);
+					}
+				} else {
+					log_error!(self.logger, "Failed to handle LSPS2ServiceEvent as LSPS2 liquidity service was not configured.",);
+					return;
+				}
+			},
+			Event::LSPS2Service(LSPS2ServiceEvent::BuyRequest {
+				request_id,
+				counterparty_node_id,
+				opening_fee_params: _,
+				payment_size_msat: _,
+			}) => {
+				if let Some(lsps2_service_handler) =
+					self.liquidity_manager.lsps2_service_handler().as_ref()
+				{
+					let user_channel_id = 0;
+					let scid = self.channel_manager.get_intercept_scid();
+					let cltv_expiry_delta = 72;
+					let client_trusts_lsp = true;
+
+					if let Err(e) = lsps2_service_handler.invoice_parameters_generated(
+						&counterparty_node_id,
+						request_id,
+						scid,
+						cltv_expiry_delta,
+						client_trusts_lsp,
+						user_channel_id,
+					) {
+						log_error!(self.logger, "Failed to provide invoice parameters: {:?}", e);
+					}
+				} else {
+					log_error!(self.logger, "Failed to handle LSPS2ServiceEvent as LSPS2 liquidity service was not configured.",);
+					return;
+				}
+			},
+			Event::LSPS2Service(LSPS2ServiceEvent::OpenChannel {
+				their_network_key,
+				amt_to_forward_msat,
+				opening_fee_msat: _,
+				user_channel_id,
+				intercept_scid: _,
+			}) => {
+				if self.liquidity_manager.lsps2_service_handler().is_none() {
+					log_error!(self.logger, "Failed to handle LSPS2ServiceEvent as LSPS2 liquidity service was not configured.",);
+					return;
+				};
+
+				let channel_size_sats = (amt_to_forward_msat / 1000) * 4;
+				let mut config = *self.channel_manager.get_current_default_configuration();
+				config
+					.channel_handshake_config
+					.max_inbound_htlc_value_in_flight_percent_of_channel = 100;
+				config.channel_config.forwarding_fee_base_msat = 0;
+				config.channel_config.forwarding_fee_proportional_millionths = 0;
+
+				if let Err(e) = self.channel_manager.create_channel(
+					their_network_key,
+					channel_size_sats,
+					0,
+					user_channel_id,
+					None,
+					Some(config),
+				) {
+					log_error!(self.logger, "Failed to open jit channel: {:?}", e);
+				}
+			},
 			Event::LSPS2Client(LSPS2ClientEvent::OpeningParametersReady {
 				request_id,
 				counterparty_node_id,