From 3b517390d8db4ce4dd0f989b1b300bdf4e9f27a1 Mon Sep 17 00:00:00 2001
From: Joost Jager <joost.jager@gmail.com>
Date: Wed, 11 Mar 2020 08:52:20 +0100
Subject: [PATCH] cnct+sweeper: give contract court access to relay fee

Relay fee is needed later to sweep anchors at the minimum fee rate.
---
 contractcourt/commit_sweep_resolver_test.go | 5 +++++
 contractcourt/interfaces.go                 | 5 +++++
 sweep/sweeper.go                            | 6 ++++++
 3 files changed, 16 insertions(+)

diff --git a/contractcourt/commit_sweep_resolver_test.go b/contractcourt/commit_sweep_resolver_test.go
index c142167e..e5c7df05 100644
--- a/contractcourt/commit_sweep_resolver_test.go
+++ b/contractcourt/commit_sweep_resolver_test.go
@@ -10,6 +10,7 @@ import (
 	"github.com/lightningnetwork/lnd/chainntnfs"
 	"github.com/lightningnetwork/lnd/input"
 	"github.com/lightningnetwork/lnd/lnwallet"
+	"github.com/lightningnetwork/lnd/lnwallet/chainfee"
 	"github.com/lightningnetwork/lnd/sweep"
 )
 
@@ -120,6 +121,10 @@ func (s *mockSweeper) CreateSweepTx(inputs []input.Input, feePref sweep.FeePrefe
 	return nil, nil
 }
 
+func (s *mockSweeper) RelayFeePerKW() chainfee.SatPerKWeight {
+	return 253
+}
+
 var _ UtxoSweeper = &mockSweeper{}
 
 // TestCommitSweepResolverNoDelay tests resolution of a direct commitment output
diff --git a/contractcourt/interfaces.go b/contractcourt/interfaces.go
index 18dfbc0e..5497dad8 100644
--- a/contractcourt/interfaces.go
+++ b/contractcourt/interfaces.go
@@ -9,6 +9,7 @@ import (
 	"github.com/lightningnetwork/lnd/input"
 	"github.com/lightningnetwork/lnd/invoices"
 	"github.com/lightningnetwork/lnd/lntypes"
+	"github.com/lightningnetwork/lnd/lnwallet/chainfee"
 	"github.com/lightningnetwork/lnd/lnwire"
 	"github.com/lightningnetwork/lnd/sweep"
 )
@@ -51,4 +52,8 @@ type UtxoSweeper interface {
 	// estimate before generating the required witnesses.
 	CreateSweepTx(inputs []input.Input, feePref sweep.FeePreference,
 		currentBlockHeight uint32) (*wire.MsgTx, error)
+
+	// RelayFeePerKW returns the minimum fee rate required for transactions
+	// to be relayed.
+	RelayFeePerKW() chainfee.SatPerKWeight
 }
diff --git a/sweep/sweeper.go b/sweep/sweeper.go
index f176f703..3b9acebe 100644
--- a/sweep/sweeper.go
+++ b/sweep/sweeper.go
@@ -384,6 +384,12 @@ func (s *UtxoSweeper) Start() error {
 	return nil
 }
 
+// RelayFeePerKW returns the minimum fee rate required for transactions to be
+// relayed.
+func (s *UtxoSweeper) RelayFeePerKW() chainfee.SatPerKWeight {
+	return s.relayFeeRate
+}
+
 // Stop stops sweeper from listening to block epochs and constructing sweep
 // txes.
 func (s *UtxoSweeper) Stop() error {