localchans: populate funding script for missing edges

When creating a missing edge, we need to populate the funding script too
so that the graph builder can update its ChainView appropriately. We use
the MakeFundingScript helper from the funding package which ensures that
we are using the same logic for creating a funding script as is used for
any of the channels that we own.

routing/localchans/manager.go

@@ -13,6 +13,7 @@ import (
 	"github.com/lightningnetwork/lnd/channeldb"
 	"github.com/lightningnetwork/lnd/discovery"
 	"github.com/lightningnetwork/lnd/fn/v2"
+	"github.com/lightningnetwork/lnd/funding"
 	"github.com/lightningnetwork/lnd/graph/db/models"
 	"github.com/lightningnetwork/lnd/lnrpc"
 	"github.com/lightningnetwork/lnd/lnwire"
@@ -321,12 +322,19 @@ func (r *Manager) createEdge(channel *channeldb.OpenChannel,
 		shortChanID = channel.ZeroConfRealScid()
 	}
 
+	fundingScript, err := funding.MakeFundingScript(channel)
+	if err != nil {
+		return nil, nil, fmt.Errorf("unable to create funding "+
+			"script: %v", err)
+	}
+
 	info := &models.ChannelEdgeInfo{
-		ChannelID:    shortChanID.ToUint64(),
-		ChainHash:    channel.ChainHash,
-		Features:     lnwire.EmptyFeatureVector(),
-		Capacity:     channel.Capacity,
-		ChannelPoint: channel.FundingOutpoint,
+		ChannelID:     shortChanID.ToUint64(),
+		ChainHash:     channel.ChainHash,
+		Features:      lnwire.EmptyFeatureVector(),
+		Capacity:      channel.Capacity,
+		ChannelPoint:  channel.FundingOutpoint,
+		FundingScript: fn.Some(fundingScript),
 	}
 
 	copy(info.NodeKey1Bytes[:], nodeKey1Bytes)

routing/localchans/manager_test.go

@@ -13,6 +13,8 @@ import (
 	"github.com/btcsuite/btcd/wire"
 	"github.com/lightningnetwork/lnd/channeldb"
 	"github.com/lightningnetwork/lnd/discovery"
+	"github.com/lightningnetwork/lnd/fn/v2"
+	"github.com/lightningnetwork/lnd/funding"
 	"github.com/lightningnetwork/lnd/graph/db/models"
 	"github.com/lightningnetwork/lnd/keychain"
 	"github.com/lightningnetwork/lnd/lnrpc"
@@ -385,6 +387,10 @@ func TestCreateEdgeLower(t *testing.T) {
 			Index: 0,
 		},
 	}
+
+	fundingScript, err := funding.MakeFundingScript(channel)
+	require.NoError(t, err)
+
 	expectedInfo := &models.ChannelEdgeInfo{
 		ChannelID:     8,
 		ChainHash:     channel.ChainHash,
@@ -399,6 +405,7 @@ func TestCreateEdgeLower(t *testing.T) {
 			remoteMultisigKey.SerializeCompressed()),
 		AuthProof:       nil,
 		ExtraOpaqueData: nil,
+		FundingScript:   fn.Some(fundingScript),
 	}
 	expectedEdge := &models.ChannelEdgePolicy{
 		ChannelID:                 8,
@@ -473,6 +480,10 @@ func TestCreateEdgeHigher(t *testing.T) {
 			Index: 0,
 		},
 	}
+
+	fundingScript, err := funding.MakeFundingScript(channel)
+	require.NoError(t, err)
+
 	expectedInfo := &models.ChannelEdgeInfo{
 		ChannelID:     8,
 		ChainHash:     channel.ChainHash,
@@ -487,6 +498,7 @@ func TestCreateEdgeHigher(t *testing.T) {
 			localMultisigKey.SerializeCompressed()),
 		AuthProof:       nil,
 		ExtraOpaqueData: nil,
+		FundingScript:   fn.Some(fundingScript),
 	}
 	expectedEdge := &models.ChannelEdgePolicy{
 		ChannelID:                 8,