fix: forward missing pending remote settlements to watchtower (#1151)

Author: doitian

crates/fiber-bin/src/main.rs

@@ -12,7 +12,8 @@ use fnn::fiber::{graph::NetworkGraph, network::init_chain_hash, network::Network
 use fnn::rpc::server::start_rpc;
 use fnn::rpc::watchtower::{
     CreatePreimageParams, CreateWatchChannelParams, RemovePreimageParams, RemoveWatchChannelParams,
-    UpdateLocalSettlementParams, UpdateRevocationParams, WatchtowerRpcClient,
+    UpdateLocalSettlementParams, UpdatePendingRemoteSettlementParams, UpdateRevocationParams,
+    WatchtowerRpcClient,
 };
 use fnn::store::Store;
 use fnn::tasks::{
@@ -558,6 +559,15 @@ async fn forward_event_to_client<T: WatchtowerRpcClient + Sync>(
                 .await
                 .expect(ASSUME_WATCHTOWER_CLIENT_CALL_OK);
         }
+        NetworkServiceEvent::LocalCommitmentSigned(channel_id, settlement_data) => {
+            watchtower_client
+                .update_pending_remote_settlement(UpdatePendingRemoteSettlementParams {
+                    channel_id,
+                    settlement_data,
+                })
+                .await
+                .expect(ASSUME_WATCHTOWER_CLIENT_CALL_OK);
+        }
         NetworkServiceEvent::PreimageCreated(payment_hash, preimage) => {
             watchtower_client
                 .create_preimage(CreatePreimageParams {

docs/biscuit-auth.md

@@ -102,6 +102,13 @@ rule(
     allow if right({channel_id}, "watchtower"); 
     "#, 
 ); 
+rule(
+    "update_pending_remote_settlement",
+    r#"
+    allow if write("watchtower");
+    allow if right({channel_id}, "watchtower");
+    "#,
+);
 rule( 
     "update_local_settlement", 
     r#"