Add ChannelMonitor::is_fully_resolved function

  Checks if the monitor is fully resolved. Resolved monitor is one that has claimed all of
  its ouputs and balacnes.

  This function returns true only if `get_claimable_balances` has been empty for at least
  2016 blocks.

lightning/src/chain/channelmonitor.rs

@@ -935,6 +935,9 @@ pub(crate) struct ChannelMonitorImpl<Signer: WriteableEcdsaChannelSigner> {
 	/// Ordering of tuple data: (their_per_commitment_point, feerate_per_kw, to_broadcaster_sats,
 	/// to_countersignatory_sats)
 	initial_counterparty_commitment_info: Option<(PublicKey, u32, u64, u64)>,
+
+	/// The first block height at which we had no remaining claimable balances.
+	balances_empty_height: Option<u32>,
 }
 
 /// Transaction outputs to watch for on-chain spends.
@@ -1145,6 +1148,7 @@ impl<Signer: WriteableEcdsaChannelSigner> Writeable for ChannelMonitorImpl<Signe
 			(15, self.counterparty_fulfilled_htlcs, required),
 			(17, self.initial_counterparty_commitment_info, option),
 			(19, self.channel_id, required),
+			(21, self.balances_empty_height, option),
 		});
 
 		Ok(())
@@ -1328,6 +1332,7 @@ impl<Signer: WriteableEcdsaChannelSigner> ChannelMonitor<Signer> {
 			best_block,
 			counterparty_node_id: Some(counterparty_node_id),
 			initial_counterparty_commitment_info: None,
+			balances_empty_height: None,
 		})
 	}
 
@@ -1856,6 +1861,42 @@ impl<Signer: WriteableEcdsaChannelSigner> ChannelMonitor<Signer> {
 		spendable_outputs
 	}
 
+	/// Checks if the monitor is fully resolved. Resolved monitor is one that has claimed all of
+	/// its outputs and balances (i.e. [`Self::get_claimable_balances`] returns an empty set).
+	///
+	/// This function returns true only if [`Self::get_claimable_balances`] has been empty for at least
+	/// 2016 blocks as an additional protection against any bugs resulting in spuriously empty balance sets.
+	pub fn is_fully_resolved(&self) -> bool {
+		let is_all_funds_claimed = self.get_claimable_balances().is_empty();
+		let current_height = self.current_best_block().height;
+		let mut inner = self.inner.lock().unwrap();
+
+		match (inner.balances_empty_height, is_all_funds_claimed) {
+			(Some(balances_empty_height), true) => {
+				// Claimed all funds, check if reached the blocks threshold.
+				const BLOCKS_THRESHOLD: u32  = 2016; // ~two weeks
+				return current_height >= balances_empty_height + BLOCKS_THRESHOLD;
+			},
+			(Some(_), false) => {
+				// previously assumed we claimed all funds, but we have new funds to claim.
+				// Should not happen in practice.
+				debug_assert!(is_all_funds_claimed, "Trying to check if monitor is fully resolved before all funds are claimed.");
+				inner.balances_empty_height = None;
+				return false;
+			},
+			(None, true) => {
+				// Claimed all funds but `balances_empty_height` is None. It is set to the
+				// current block height.
+				inner.balances_empty_height = Some(current_height);
+				return false;
+			},
+			(None, false) => {
+				// Have funds to claim.
+				return false;
+			},
+		}
+	}
+
 	#[cfg(test)]
 	pub fn get_counterparty_payment_script(&self) -> ScriptBuf {
 		self.inner.lock().unwrap().counterparty_payment_script.clone()
@@ -4632,6 +4673,7 @@ impl<'a, 'b, ES: EntropySource, SP: SignerProvider> ReadableArgs<(&'a ES, &'b SP
 		let mut spendable_txids_confirmed = Some(Vec::new());
 		let mut counterparty_fulfilled_htlcs = Some(new_hash_map());
 		let mut initial_counterparty_commitment_info = None;
+		let mut balances_empty_height = None;
 		let mut channel_id = None;
 		read_tlv_fields!(reader, {
 			(1, funding_spend_confirmed, option),
@@ -4644,6 +4686,7 @@ impl<'a, 'b, ES: EntropySource, SP: SignerProvider> ReadableArgs<(&'a ES, &'b SP
 			(15, counterparty_fulfilled_htlcs, option),
 			(17, initial_counterparty_commitment_info, option),
 			(19, channel_id, option),
+			(21, balances_empty_height, option),
 		});
 
 		// `HolderForceClosedWithInfo` replaced `HolderForceClosed` in v0.0.122. If we have both
@@ -4722,6 +4765,7 @@ impl<'a, 'b, ES: EntropySource, SP: SignerProvider> ReadableArgs<(&'a ES, &'b SP
 			best_block,
 			counterparty_node_id,
 			initial_counterparty_commitment_info,
+			balances_empty_height,
 		})))
 	}
 }