Merge pull request #55 from joostjager/report-cost

multi: persist swap cost and report over rpc

client.go

@@ -138,12 +138,12 @@ func (s *Client) FetchSwaps() ([]*SwapInfo, error) {
 		}
 
 		swaps = append(swaps, &SwapInfo{
-			SwapType:     TypeOut,
-			SwapContract: swp.Contract.SwapContract,
-			State:        swp.State(),
-			SwapHash:     swp.Hash,
-			LastUpdate:   swp.LastUpdateTime(),
-			HtlcAddress:  htlc.Address,
+			SwapType:      TypeOut,
+			SwapContract:  swp.Contract.SwapContract,
+			SwapStateData: swp.State(),
+			SwapHash:      swp.Hash,
+			LastUpdate:    swp.LastUpdateTime(),
+			HtlcAddress:   htlc.Address,
 		})
 	}
 
@@ -158,12 +158,12 @@ func (s *Client) FetchSwaps() ([]*SwapInfo, error) {
 		}
 
 		swaps = append(swaps, &SwapInfo{
-			SwapType:     TypeIn,
-			SwapContract: swp.Contract.SwapContract,
-			State:        swp.State(),
-			SwapHash:     swp.Hash,
-			LastUpdate:   swp.LastUpdateTime(),
-			HtlcAddress:  htlc.Address,
+			SwapType:      TypeIn,
+			SwapContract:  swp.Contract.SwapContract,
+			SwapStateData: swp.State(),
+			SwapHash:      swp.Hash,
+			LastUpdate:    swp.LastUpdateTime(),
+			HtlcAddress:   htlc.Address,
 		})
 	}
 
@@ -259,7 +259,7 @@ func (s *Client) resumeSwaps(ctx context.Context,
 	}
 
 	for _, pend := range loopOutSwaps {
-		if pend.State().Type() != loopdb.StateTypePending {
+		if pend.State().State.Type() != loopdb.StateTypePending {
 			continue
 		}
 		swap, err := resumeLoopOutSwap(ctx, swapCfg, pend)
@@ -272,7 +272,7 @@ func (s *Client) resumeSwaps(ctx context.Context,
 	}
 
 	for _, pend := range loopInSwaps {
-		if pend.State().Type() != loopdb.StateTypePending {
+		if pend.State().State.Type() != loopdb.StateTypePending {
 			continue
 		}
 		swap, err := resumeLoopInSwap(ctx, swapCfg, pend)

client_test.go

@@ -202,7 +202,9 @@ func testResume(t *testing.T, expired, preimageRevealed, expectSuccess bool) {
 		Loop: loopdb.Loop{
 			Events: []*loopdb.LoopEvent{
 				{
-					State: state,
+					SwapStateData: loopdb.SwapStateData{
+						State: state,
+					},
 				},
 			},
 			Hash: hash,

cmd/loop/main.go

@@ -176,11 +176,22 @@ func parseAmt(text string) (btcutil.Amount, error) {
 }
 
 func logSwap(swap *looprpc.SwapStatus) {
-	fmt.Printf("%v %v %v %v - %v\n",
+	fmt.Printf("%v %v %v %v - %v",
 		time.Unix(0, swap.LastUpdateTime).Format(time.RFC3339),
 		swap.Type, swap.State, btcutil.Amount(swap.Amt),
 		swap.HtlcAddress,
 	)
+
+	if swap.State != looprpc.SwapState_INITIATED &&
+		swap.State != looprpc.SwapState_HTLC_PUBLISHED &&
+		swap.State != looprpc.SwapState_PREIMAGE_REVEALED {
+
+		fmt.Printf(" (cost: server %v, onchain %v, offchain %v)",
+			swap.CostServer, swap.CostOnchain, swap.CostOffchain,
+		)
+	}
+
+	fmt.Println()
 }
 
 func getClientConn(address string) (*grpc.ClientConn, error) {

cmd/loop/monitor.go

@@ -28,6 +28,9 @@ func monitor(ctx *cli.Context) error {
 		return err
 	}
 
+	fmt.Printf("Note: offchain cost may report as 0 after loopd restart " +
+		"during swap\n")
+
 	for {
 		swap, err := stream.Recv()
 		if err != nil {

cmd/loopd/swapclient_server.go

@@ -121,6 +121,9 @@ func (s *swapClientServer) marshallSwap(loopSwap *loop.SwapInfo) (
 		LastUpdateTime: loopSwap.LastUpdate.UnixNano(),
 		HtlcAddress:    loopSwap.HtlcAddress.EncodeAddress(),
 		Type:           swapType,
+		CostServer:     int64(loopSwap.Cost.Server),
+		CostOnchain:    int64(loopSwap.Cost.Onchain),
+		CostOffchain:   int64(loopSwap.Cost.Offchain),
 	}, nil
 }
 

cmd/loopd/view.go

@@ -6,6 +6,7 @@ import (
 
 	"github.com/btcsuite/btcd/chaincfg"
 	"github.com/lightninglabs/loop"
+	"github.com/lightninglabs/loop/loopdb"
 	"github.com/lightninglabs/loop/swap"
 )
 
@@ -77,9 +78,19 @@ func viewOut(swapClient *loop.Client, chainParams *chaincfg.Params) error {
 			s.Contract.AmountRequested, s.Contract.CltvExpiry,
 		)
 		for i, e := range s.Events {
-			fmt.Printf("   Update %v, Time %v, State: %v\n",
+			fmt.Printf("   Update %v, Time %v, State: %v",
 				i, e.Time, e.State,
 			)
+			if e.State.Type() != loopdb.StateTypePending {
+				fmt.Printf(", Cost: server=%v, onchain=%v, "+
+					"offchain=%v",
+					e.Cost.Server,
+					e.Cost.Onchain,
+					e.Cost.Offchain,
+				)
+			}
+
+			fmt.Println()
 		}
 		fmt.Println()
 	}

interface.go

@@ -83,15 +83,6 @@ type Out struct {
 	SwapInfoKit
 }
 
-// SwapCost is a breakdown of the final swap costs.
-type SwapCost struct {
-	// Swap is the amount paid to the server.
-	Server btcutil.Amount
-
-	// Onchain is the amount paid to miners for the onchain tx.
-	Onchain btcutil.Amount
-}
-
 // LoopOutQuoteRequest specifies the swap parameters for which a quote is
 // requested.
 type LoopOutQuoteRequest struct {
@@ -280,12 +271,12 @@ func (t Type) String() string {
 
 // SwapInfo exposes common info fields for loop in and loop out swaps.
 type SwapInfo struct {
+	loopdb.SwapStateData
+
 	LastUpdate time.Time
 
 	SwapHash lntypes.Hash
 
-	State loopdb.SwapState
-
 	SwapType Type
 
 	loopdb.SwapContract

loopdb/interface.go

@@ -18,7 +18,8 @@ type SwapStore interface {
 	// UpdateLoopOut stores a new event for a target loop out swap. This
 	// appends to the event log for a particular swap as it goes through
 	// the various stages in its lifetime.
-	UpdateLoopOut(hash lntypes.Hash, time time.Time, state SwapState) error
+	UpdateLoopOut(hash lntypes.Hash, time time.Time,
+		state SwapStateData) error
 
 	// FetchLoopInSwaps returns all swaps currently in the store.
 	FetchLoopInSwaps() ([]*LoopIn, error)
@@ -29,7 +30,8 @@ type SwapStore interface {
 	// UpdateLoopIn stores a new event for a target loop in swap. This
 	// appends to the event log for a particular swap as it goes through
 	// the various stages in its lifetime.
-	UpdateLoopIn(hash lntypes.Hash, time time.Time, state SwapState) error
+	UpdateLoopIn(hash lntypes.Hash, time time.Time,
+		state SwapStateData) error
 
 	// Close closes the underlying database.
 	Close() error

loopdb/log.go

@@ -1,44 +1,21 @@
 package loopdb
 
 import (
+	"os"
+
 	"github.com/btcsuite/btclog"
 )
 
-// log is a logger that is initialized with no output filters.  This means
-// the package will not perform any logging by default until the caller
-// requests it.
-var log btclog.Logger
+var (
+	backendLog = btclog.NewBackend(logWriter{})
+	log        = backendLog.Logger("STORE")
+)
 
-// The default amount of logging is none.
-func init() {
-	DisableLog()
-}
-
-// DisableLog disables all library log output.  Logging output is disabled
-// by default until either UseLogger or SetLogWriter are called.
-func DisableLog() {
-	log = btclog.Disabled
-}
-
-// UseLogger uses a specified Logger to output package logging info.
-// This should be used in preference to SetLogWriter if the caller is also
-// using btclog.
-func UseLogger(logger btclog.Logger) {
-	log = logger
-}
-
-// logClosure is used to provide a closure over expensive logging operations so
-// don't have to be performed when the logging level doesn't warrant it.
-type logClosure func() string
-
-// String invokes the underlying function and returns the result.
-func (c logClosure) String() string {
-	return c()
-}
-
-// newLogClosure returns a new closure over a function that returns a string
-// which itself provides a Stringer interface so that it can be used with the
-// logging system.
-func newLogClosure(c func() string) logClosure {
-	return logClosure(c)
+// logWriter implements an io.Writer that outputs to both standard output and
+// the write-end pipe of an initialized log rotator.
+type logWriter struct{}
+
+func (logWriter) Write(p []byte) (n int, err error) {
+	os.Stdout.Write(p)
+	return len(p), nil
 }

loopdb/loop.go

@@ -53,21 +53,22 @@ type Loop struct {
 
 // LoopEvent contains the dynamic data of a swap.
 type LoopEvent struct {
-	// State is the new state for this swap as a result of this event.
-	State SwapState
+	SwapStateData
 
 	// Time is the time that this swap had its state changed.
 	Time time.Time
 }
 
 // State returns the most recent state of this swap.
-func (s *Loop) State() SwapState {
+func (s *Loop) State() SwapStateData {
 	lastUpdate := s.LastUpdate()
 	if lastUpdate == nil {
-		return StateInitiated
+		return SwapStateData{
+			State: StateInitiated,
+		}
 	}
 
-	return lastUpdate.State
+	return lastUpdate.SwapStateData
 }
 
 // LastUpdate returns the most recent update of this swap.
@@ -84,7 +85,7 @@ func (s *Loop) LastUpdate() *LoopEvent {
 
 // serializeLoopEvent serializes a state update of a swap. This is used for both
 // in and out swaps.
-func serializeLoopEvent(time time.Time, state SwapState) (
+func serializeLoopEvent(time time.Time, state SwapStateData) (
 	[]byte, error) {
 
 	var b bytes.Buffer
@@ -93,7 +94,19 @@ func serializeLoopEvent(time time.Time, state SwapState) (
 		return nil, err
 	}
 
-	if err := binary.Write(&b, byteOrder, state); err != nil {
+	if err := binary.Write(&b, byteOrder, state.State); err != nil {
+		return nil, err
+	}
+
+	if err := binary.Write(&b, byteOrder, state.Cost.Server); err != nil {
+		return nil, err
+	}
+
+	if err := binary.Write(&b, byteOrder, state.Cost.Onchain); err != nil {
+		return nil, err
+	}
+
+	if err := binary.Write(&b, byteOrder, state.Cost.Offchain); err != nil {
 		return nil, err
 	}
 
@@ -117,5 +130,17 @@ func deserializeLoopEvent(value []byte) (*LoopEvent, error) {
 		return nil, err
 	}
 
+	if err := binary.Read(r, byteOrder, &update.Cost.Server); err != nil {
+		return nil, err
+	}
+
+	if err := binary.Read(r, byteOrder, &update.Cost.Onchain); err != nil {
+		return nil, err
+	}
+
+	if err := binary.Read(r, byteOrder, &update.Cost.Offchain); err != nil {
+		return nil, err
+	}
+
 	return update, nil
 }

loopdb/meta.go

@@ -10,7 +10,7 @@ import (
 var (
 	// metaBucket stores all the meta information concerning the state of
 	// the database.
-	metaBucket = []byte("metadata")
+	metaBucketKey = []byte("metadata")
 
 	// dbVersionKey is a boltdb key and it's used for storing/retrieving
 	// current database version.
@@ -31,7 +31,7 @@ var (
 	// of database don't match with latest version this list will be used
 	// for retrieving all migration function that are need to apply to the
 	// current db.
-	migrations = []migration{}
+	migrations = []migration{migrateCosts}
 
 	latestDBVersion = uint32(len(migrations))
 )
@@ -41,7 +41,7 @@ func getDBVersion(db *bbolt.DB) (uint32, error) {
 	var version uint32
 
 	err := db.View(func(tx *bbolt.Tx) error {
-		metaBucket := tx.Bucket(metaBucket)
+		metaBucket := tx.Bucket(metaBucketKey)
 		if metaBucket == nil {
 			return errors.New("bucket does not exist")
 		}
@@ -61,11 +61,11 @@ func getDBVersion(db *bbolt.DB) (uint32, error) {
 	return version, nil
 }
 
-// getDBVersion updates the current db version.
+// setDBVersion updates the current db version.
 func setDBVersion(tx *bbolt.Tx, version uint32) error {
-	metaBucket := tx.Bucket(metaBucket)
-	if metaBucket == nil {
-		return errors.New("bucket does not exist")
+	metaBucket, err := tx.CreateBucketIfNotExists(metaBucketKey)
+	if err != nil {
+		return fmt.Errorf("set db version: %v", err)
 	}
 
 	scratch := make([]byte, 4)

loopdb/migration_01_costs.go

@@ -0,0 +1,78 @@
+package loopdb
+
+import (
+	"errors"
+	"fmt"
+
+	"github.com/coreos/bbolt"
+)
+
+// noMigrationAvailable is the fall back migration in case there is no migration
+// implemented.
+func migrateCosts(tx *bbolt.Tx) error {
+	if err := migrateCostsForBucket(tx, loopInBucketKey); err != nil {
+		return err
+	}
+	if err := migrateCostsForBucket(tx, loopOutBucketKey); err != nil {
+		return err
+	}
+	return nil
+}
+
+func migrateCostsForBucket(tx *bbolt.Tx, bucketKey []byte) error {
+	// First, we'll grab our main loop in bucket key.
+	rootBucket := tx.Bucket(bucketKey)
+	if rootBucket == nil {
+		return errors.New("bucket does not exist")
+	}
+
+	// We'll now traverse the root bucket for all active swaps. The
+	// primary key is the swap hash itself.
+	return rootBucket.ForEach(func(swapHash, v []byte) error {
+		// Only go into things that we know are sub-bucket
+		// keys.
+		if v != nil {
+			return nil
+		}
+
+		// From the root bucket, we'll grab the next swap
+		// bucket for this swap from its swaphash.
+		swapBucket := rootBucket.Bucket(swapHash)
+		if swapBucket == nil {
+			return fmt.Errorf("swap bucket %x not found",
+				swapHash)
+		}
+
+		// Get the updates bucket.
+		updatesBucket := swapBucket.Bucket(updatesBucketKey)
+		if updatesBucket == nil {
+			return errors.New("updates bucket not found")
+		}
+
+		// Get list of all update ids.
+		var ids [][]byte
+		err := updatesBucket.ForEach(func(k, v []byte) error {
+			ids = append(ids, k)
+			return nil
+		})
+		if err != nil {
+			return err
+		}
+
+		// Append three zeroed cost factors to all updates.
+		var emptyCosts [3 * 8]byte
+		for _, id := range ids {
+			v := updatesBucket.Get(id)
+			if v == nil {
+				return errors.New("empty value")
+			}
+			v = append(v, emptyCosts[:]...)
+			err := updatesBucket.Put(id, v)
+			if err != nil {
+				return err
+			}
+		}
+
+		return nil
+	})
+}

loopdb/store.go

@@ -100,18 +100,33 @@ func NewBoltSwapStore(dbPath string, chainParams *chaincfg.Params) (
 	// We'll create all the buckets we need if this is the first time we're
 	// starting up. If they already exist, then these calls will be noops.
 	err = bdb.Update(func(tx *bbolt.Tx) error {
-		_, err := tx.CreateBucketIfNotExists(loopOutBucketKey)
+		// Check if the meta bucket exists. If it exists, we consider
+		// the database as initialized and assume the meta bucket
+		// contains the db version.
+		metaBucket := tx.Bucket(metaBucketKey)
+		if metaBucket == nil {
+			log.Infof("Initializing new database with version %v",
+				latestDBVersion)
+
+			// Set db version to the current version.
+			err := setDBVersion(tx, latestDBVersion)
+			if err != nil {
+				return err
+			}
+		}
+
+		// Try creating these buckets, because loop in was added without
+		// bumping the db version number.
+		_, err = tx.CreateBucketIfNotExists(loopOutBucketKey)
 		if err != nil {
 			return err
 		}
+
 		_, err = tx.CreateBucketIfNotExists(loopInBucketKey)
 		if err != nil {
 			return err
 		}
-		_, err = tx.CreateBucketIfNotExists(metaBucket)
-		if err != nil {
-			return err
-		}
+
 		return nil
 	})
 	if err != nil {
@@ -346,7 +361,7 @@ func (s *boltSwapStore) CreateLoopIn(hash lntypes.Hash,
 // updateLoop saves a new swap state transition to the store. It takes in a
 // bucket key so that this function can be used for both in and out swaps.
 func (s *boltSwapStore) updateLoop(bucketKey []byte, hash lntypes.Hash,
-	time time.Time, state SwapState) error {
+	time time.Time, state SwapStateData) error {
 
 	return s.db.Update(func(tx *bbolt.Tx) error {
 		// Starting from the root bucket, we'll traverse the bucket
@@ -386,7 +401,7 @@ func (s *boltSwapStore) updateLoop(bucketKey []byte, hash lntypes.Hash,
 //
 // NOTE: Part of the loopdb.SwapStore interface.
 func (s *boltSwapStore) UpdateLoopOut(hash lntypes.Hash, time time.Time,
-	state SwapState) error {
+	state SwapStateData) error {
 
 	return s.updateLoop(loopOutBucketKey, hash, time, state)
 }
@@ -396,7 +411,7 @@ func (s *boltSwapStore) UpdateLoopOut(hash lntypes.Hash, time time.Time,
 //
 // NOTE: Part of the loopdb.SwapStore interface.
 func (s *boltSwapStore) UpdateLoopIn(hash lntypes.Hash, time time.Time,
-	state SwapState) error {
+	state SwapStateData) error {
 
 	return s.updateLoop(loopInBucketKey, hash, time, state)
 }

loopdb/store_test.go

@@ -4,11 +4,13 @@ import (
 	"crypto/sha256"
 	"io/ioutil"
 	"os"
+	"path/filepath"
 	"reflect"
 	"testing"
 	"time"
 
 	"github.com/btcsuite/btcd/chaincfg"
+	"github.com/coreos/bbolt"
 	"github.com/lightninglabs/loop/test"
 	"github.com/lightningnetwork/lnd/lntypes"
 )
@@ -107,7 +109,7 @@ func TestLoopOutStore(t *testing.T) {
 			t.Fatal("invalid pending swap data")
 		}
 
-		if swaps[0].State() != expectedState {
+		if swaps[0].State().State != expectedState {
 			t.Fatalf("expected state %v, but got %v",
 				expectedState, swaps[0].State(),
 			)
@@ -130,7 +132,10 @@ func TestLoopOutStore(t *testing.T) {
 	// Next, we'll update to the next state of the pre-image being
 	// revealed. The state should be reflected here again.
 	err = store.UpdateLoopOut(
-		hash, testTime, StatePreimageRevealed,
+		hash, testTime,
+		SwapStateData{
+			State: StatePreimageRevealed,
+		},
 	)
 	if err != nil {
 		t.Fatal(err)
@@ -140,7 +145,10 @@ func TestLoopOutStore(t *testing.T) {
 	// Next, we'll update to the final state to ensure that the state is
 	// properly updated.
 	err = store.UpdateLoopOut(
-		hash, testTime, StateFailInsufficientValue,
+		hash, testTime,
+		SwapStateData{
+			State: StateFailInsufficientValue,
+		},
 	)
 	if err != nil {
 		t.Fatal(err)
@@ -229,7 +237,7 @@ func TestLoopInStore(t *testing.T) {
 			t.Fatal("invalid pending swap data")
 		}
 
-		if swaps[0].State() != expectedState {
+		if swaps[0].State().State != expectedState {
 			t.Fatalf("expected state %v, but got %v",
 				expectedState, swaps[0].State(),
 			)
@@ -252,7 +260,10 @@ func TestLoopInStore(t *testing.T) {
 	// Next, we'll update to the next state of the pre-image being
 	// revealed. The state should be reflected here again.
 	err = store.UpdateLoopIn(
-		hash, testTime, StatePreimageRevealed,
+		hash, testTime,
+		SwapStateData{
+			State: StatePreimageRevealed,
+		},
 	)
 	if err != nil {
 		t.Fatal(err)
@@ -262,7 +273,10 @@ func TestLoopInStore(t *testing.T) {
 	// Next, we'll update to the final state to ensure that the state is
 	// properly updated.
 	err = store.UpdateLoopIn(
-		hash, testTime, StateFailInsufficientValue,
+		hash, testTime,
+		SwapStateData{
+			State: StateFailInsufficientValue,
+		},
 	)
 	if err != nil {
 		t.Fatal(err)
@@ -281,3 +295,72 @@ func TestLoopInStore(t *testing.T) {
 	}
 	checkSwap(StateFailInsufficientValue)
 }
+
+// TestVersionNew tests that a new database is initialized with the current
+// version.
+func TestVersionNew(t *testing.T) {
+	tempDirName, err := ioutil.TempDir("", "clientstore")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(tempDirName)
+
+	store, err := NewBoltSwapStore(tempDirName, &chaincfg.MainNetParams)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	ver, err := getDBVersion(store.db)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if ver != latestDBVersion {
+		t.Fatal("db not at latest version")
+	}
+}
+
+// TestVersionNew tests that an existing version zero database is migrated to
+// the latest version.
+func TestVersionMigrated(t *testing.T) {
+	tempDirName, err := ioutil.TempDir("", "clientstore")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(tempDirName)
+
+	createVersionZeroDb(t, tempDirName)
+
+	store, err := NewBoltSwapStore(tempDirName, &chaincfg.MainNetParams)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	ver, err := getDBVersion(store.db)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if ver != latestDBVersion {
+		t.Fatal("db not at latest version")
+	}
+}
+
+// createVersionZeroDb creates a database with an empty meta bucket. In version
+// zero, there was no version key specified yet.
+func createVersionZeroDb(t *testing.T, dbPath string) {
+	path := filepath.Join(dbPath, dbFileName)
+	bdb, err := bbolt.Open(path, 0600, nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer bdb.Close()
+
+	err = bdb.Update(func(tx *bbolt.Tx) error {
+		_, err := tx.CreateBucket(metaBucketKey)
+		return err
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+}

loopdb/swapstate.go

@@ -1,5 +1,7 @@
 package loopdb
 
+import "github.com/btcsuite/btcutil"
+
 // SwapState indicates the current state of a swap. This enumeration is the
 // union of loop in and loop out states. A single type is used for both swap
 // types to be able to reduce code duplication that would otherwise be required.
@@ -125,3 +127,24 @@ func (s SwapState) String() string {
 		return "Unknown"
 	}
 }
+
+// SwapCost is a breakdown of the final swap costs.
+type SwapCost struct {
+	// Swap is the amount paid to the server.
+	Server btcutil.Amount
+
+	// Onchain is the amount paid to miners for the onchain tx.
+	Onchain btcutil.Amount
+
+	// Offchain is the amount paid in routing fees.
+	Offchain btcutil.Amount
+}
+
+// SwapStateData is all persistent data to describe the current swap state.
+type SwapStateData struct {
+	// SwapState is the state the swap is in.
+	State SwapState
+
+	// Cost are the accrued (final) costs so far.
+	Cost SwapCost
+}

loopin.go

@@ -261,10 +261,11 @@ func (s *loopInSwap) execute(mainCtx context.Context,
 	}
 
 	s.log.Infof("Loop in swap completed: %v "+
-		"(final cost: server %v, onchain %v)",
+		"(final cost: server %v, onchain %v, offchain %v)",
 		s.state,
 		s.cost.Server,
 		s.cost.Onchain,
+		s.cost.Offchain,
 	)
 
 	return nil
@@ -616,7 +617,13 @@ func (s *loopInSwap) publishTimeoutTx(ctx context.Context,
 // persistState updates the swap state and sends out an update notification.
 func (s *loopInSwap) persistState(ctx context.Context) error {
 	// Update state in store.
-	err := s.store.UpdateLoopIn(s.hash, s.lastUpdateTime, s.state)
+	err := s.store.UpdateLoopIn(
+		s.hash, s.lastUpdateTime,
+		loopdb.SwapStateData{
+			State: s.state,
+			Cost:  s.cost,
+		},
+	)
 	if err != nil {
 		return err
 	}

loopin_test.go

@@ -248,7 +248,9 @@ func testLoopInResume(t *testing.T, state loopdb.SwapState, expired bool) {
 		Loop: loopdb.Loop{
 			Events: []*loopdb.LoopEvent{
 				{
-					State: state,
+					SwapStateData: loopdb.SwapStateData{
+						State: state,
+					},
 				},
 			},
 			Hash: testPreimage.Hash(),

loopout.go

@@ -224,6 +224,7 @@ func (s *loopOutSwap) executeAndFinalize(globalCtx context.Context) error {
 				continue
 			}
 			s.cost.Server += result.PaidAmt
+			s.cost.Offchain += result.PaidFee
 
 		case result := <-s.prePaymentChan:
 			s.prePaymentChan = nil
@@ -235,6 +236,7 @@ func (s *loopOutSwap) executeAndFinalize(globalCtx context.Context) error {
 				continue
 			}
 			s.cost.Server += result.PaidAmt
+			s.cost.Offchain += result.PaidFee
 
 		case <-globalCtx.Done():
 			return globalCtx.Err()
@@ -243,10 +245,11 @@ func (s *loopOutSwap) executeAndFinalize(globalCtx context.Context) error {
 
 	// Mark swap completed in store.
 	s.log.Infof("Swap completed: %v "+
-		"(final cost: server %v, onchain %v)",
+		"(final cost: server %v, onchain %v, offchain %v)",
 		s.state,
 		s.cost.Server,
 		s.cost.Onchain,
+		s.cost.Offchain,
 	)
 
 	return s.persistState(globalCtx)
@@ -342,7 +345,13 @@ func (s *loopOutSwap) persistState(ctx context.Context) error {
 	s.lastUpdateTime = updateTime
 
 	// Update state in store.
-	err := s.store.UpdateLoopOut(s.hash, updateTime, s.state)
+	err := s.store.UpdateLoopOut(
+		s.hash, updateTime,
+		loopdb.SwapStateData{
+			State: s.state,
+			Cost:  s.cost,
+		},
+	)
 	if err != nil {
 		return err
 	}
@@ -441,6 +450,7 @@ func (s *loopOutSwap) waitForConfirmedHtlc(globalCtx context.Context) (
 					return nil, nil
 				}
 				s.cost.Server += result.PaidAmt
+				s.cost.Offchain += result.PaidFee
 
 			// If the prepay fails, abandon the swap. Because we
 			// didn't reveal the preimage, the swap payment will be
@@ -455,6 +465,7 @@ func (s *loopOutSwap) waitForConfirmedHtlc(globalCtx context.Context) (
 					return nil, nil
 				}
 				s.cost.Server += result.PaidAmt
+				s.cost.Offchain += result.PaidFee
 
 			// Unexpected error on the confirm channel happened,
 			// abandon the swap.

looprpc/client.pb.go

@@ -46,7 +46,7 @@ func (x SwapType) String() string {
 	return proto.EnumName(SwapType_name, int32(x))
 }
 func (SwapType) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_client_ba4b73c10b9bbc2a, []int{0}
+	return fileDescriptor_client_cce8684ac06bdedc, []int{0}
 }
 
 type SwapState int32
@@ -103,7 +103,7 @@ func (x SwapState) String() string {
 	return proto.EnumName(SwapState_name, int32(x))
 }
 func (SwapState) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_client_ba4b73c10b9bbc2a, []int{1}
+	return fileDescriptor_client_cce8684ac06bdedc, []int{1}
 }
 
 type LoopOutRequest struct {
@@ -161,7 +161,7 @@ func (m *LoopOutRequest) Reset()         { *m = LoopOutRequest{} }
 func (m *LoopOutRequest) String() string { return proto.CompactTextString(m) }
 func (*LoopOutRequest) ProtoMessage()    {}
 func (*LoopOutRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_client_ba4b73c10b9bbc2a, []int{0}
+	return fileDescriptor_client_cce8684ac06bdedc, []int{0}
 }
 func (m *LoopOutRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_LoopOutRequest.Unmarshal(m, b)
@@ -274,7 +274,7 @@ func (m *LoopInRequest) Reset()         { *m = LoopInRequest{} }
 func (m *LoopInRequest) String() string { return proto.CompactTextString(m) }
 func (*LoopInRequest) ProtoMessage()    {}
 func (*LoopInRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_client_ba4b73c10b9bbc2a, []int{1}
+	return fileDescriptor_client_cce8684ac06bdedc, []int{1}
 }
 func (m *LoopInRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_LoopInRequest.Unmarshal(m, b)
@@ -346,7 +346,7 @@ func (m *SwapResponse) Reset()         { *m = SwapResponse{} }
 func (m *SwapResponse) String() string { return proto.CompactTextString(m) }
 func (*SwapResponse) ProtoMessage()    {}
 func (*SwapResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_client_ba4b73c10b9bbc2a, []int{2}
+	return fileDescriptor_client_cce8684ac06bdedc, []int{2}
 }
 func (m *SwapResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_SwapResponse.Unmarshal(m, b)
@@ -390,7 +390,7 @@ func (m *MonitorRequest) Reset()         { *m = MonitorRequest{} }
 func (m *MonitorRequest) String() string { return proto.CompactTextString(m) }
 func (*MonitorRequest) ProtoMessage()    {}
 func (*MonitorRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_client_ba4b73c10b9bbc2a, []int{3}
+	return fileDescriptor_client_cce8684ac06bdedc, []int{3}
 }
 func (m *MonitorRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_MonitorRequest.Unmarshal(m, b)
@@ -433,7 +433,13 @@ type SwapStatus struct {
 	LastUpdateTime int64 `protobuf:"varint,6,opt,name=last_update_time,json=lastUpdateTime,proto3" json:"last_update_time,omitempty"`
 	// *
 	// Htlc address.
-	HtlcAddress          string   `protobuf:"bytes,7,opt,name=htlc_address,json=htlcAddress,proto3" json:"htlc_address,omitempty"`
+	HtlcAddress string `protobuf:"bytes,7,opt,name=htlc_address,json=htlcAddress,proto3" json:"htlc_address,omitempty"`
+	// / Swap server cost
+	CostServer int64 `protobuf:"varint,8,opt,name=cost_server,json=costServer,proto3" json:"cost_server,omitempty"`
+	// On-chain transaction cost
+	CostOnchain int64 `protobuf:"varint,9,opt,name=cost_onchain,json=costOnchain,proto3" json:"cost_onchain,omitempty"`
+	// Off-chain routing fees
+	CostOffchain         int64    `protobuf:"varint,10,opt,name=cost_offchain,json=costOffchain,proto3" json:"cost_offchain,omitempty"`
 	XXX_NoUnkeyedLiteral struct{} `json:"-"`
 	XXX_unrecognized     []byte   `json:"-"`
 	XXX_sizecache        int32    `json:"-"`
@@ -443,7 +449,7 @@ func (m *SwapStatus) Reset()         { *m = SwapStatus{} }
 func (m *SwapStatus) String() string { return proto.CompactTextString(m) }
 func (*SwapStatus) ProtoMessage()    {}
 func (*SwapStatus) Descriptor() ([]byte, []int) {
-	return fileDescriptor_client_ba4b73c10b9bbc2a, []int{4}
+	return fileDescriptor_client_cce8684ac06bdedc, []int{4}
 }
 func (m *SwapStatus) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_SwapStatus.Unmarshal(m, b)
@@ -512,6 +518,27 @@ func (m *SwapStatus) GetHtlcAddress() string {
 	return ""
 }
 
+func (m *SwapStatus) GetCostServer() int64 {
+	if m != nil {
+		return m.CostServer
+	}
+	return 0
+}
+
+func (m *SwapStatus) GetCostOnchain() int64 {
+	if m != nil {
+		return m.CostOnchain
+	}
+	return 0
+}
+
+func (m *SwapStatus) GetCostOffchain() int64 {
+	if m != nil {
+		return m.CostOffchain
+	}
+	return 0
+}
+
 type TermsRequest struct {
 	XXX_NoUnkeyedLiteral struct{} `json:"-"`
 	XXX_unrecognized     []byte   `json:"-"`
@@ -522,7 +549,7 @@ func (m *TermsRequest) Reset()         { *m = TermsRequest{} }
 func (m *TermsRequest) String() string { return proto.CompactTextString(m) }
 func (*TermsRequest) ProtoMessage()    {}
 func (*TermsRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_client_ba4b73c10b9bbc2a, []int{5}
+	return fileDescriptor_client_cce8684ac06bdedc, []int{5}
 }
 func (m *TermsRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_TermsRequest.Unmarshal(m, b)
@@ -574,7 +601,7 @@ func (m *TermsResponse) Reset()         { *m = TermsResponse{} }
 func (m *TermsResponse) String() string { return proto.CompactTextString(m) }
 func (*TermsResponse) ProtoMessage()    {}
 func (*TermsResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_client_ba4b73c10b9bbc2a, []int{6}
+	return fileDescriptor_client_cce8684ac06bdedc, []int{6}
 }
 func (m *TermsResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_TermsResponse.Unmarshal(m, b)
@@ -656,7 +683,7 @@ func (m *QuoteRequest) Reset()         { *m = QuoteRequest{} }
 func (m *QuoteRequest) String() string { return proto.CompactTextString(m) }
 func (*QuoteRequest) ProtoMessage()    {}
 func (*QuoteRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_client_ba4b73c10b9bbc2a, []int{7}
+	return fileDescriptor_client_cce8684ac06bdedc, []int{7}
 }
 func (m *QuoteRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_QuoteRequest.Unmarshal(m, b)
@@ -702,7 +729,7 @@ func (m *QuoteResponse) Reset()         { *m = QuoteResponse{} }
 func (m *QuoteResponse) String() string { return proto.CompactTextString(m) }
 func (*QuoteResponse) ProtoMessage()    {}
 func (*QuoteResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_client_ba4b73c10b9bbc2a, []int{8}
+	return fileDescriptor_client_cce8684ac06bdedc, []int{8}
 }
 func (m *QuoteResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_QuoteResponse.Unmarshal(m, b)
@@ -1099,67 +1126,70 @@ var _SwapClient_serviceDesc = grpc.ServiceDesc{
 	Metadata: "client.proto",
 }
 
-func init() { proto.RegisterFile("client.proto", fileDescriptor_client_ba4b73c10b9bbc2a) }
+func init() { proto.RegisterFile("client.proto", fileDescriptor_client_cce8684ac06bdedc) }
 
-var fileDescriptor_client_ba4b73c10b9bbc2a = []byte{
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-	0x01, 0x00, 0x00, 0xff, 0xff, 0xc4, 0x2d, 0xd7, 0x0b, 0xd5, 0x07, 0x00, 0x00,
+var fileDescriptor_client_cce8684ac06bdedc = []byte{
+	// 992 bytes of a gzipped FileDescriptorProto
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 }

looprpc/client.proto

@@ -221,6 +221,15 @@ message SwapStatus {
     Htlc address.
     */
     string htlc_address = 7;
+
+    /// Swap server cost
+    int64 cost_server = 8;
+
+    // On-chain transaction cost
+    int64 cost_onchain = 9;
+
+    // Off-chain routing fees
+    int64 cost_offchain = 10;
 }
 
 enum SwapType {

looprpc/client.swagger.json

@@ -210,6 +210,21 @@
         "htlc_address": {
           "type": "string",
           "description": "*\nHtlc address."
+        },
+        "cost_server": {
+          "type": "string",
+          "format": "int64",
+          "title": "/ Swap server cost"
+        },
+        "cost_onchain": {
+          "type": "string",
+          "format": "int64",
+          "title": "On-chain transaction cost"
+        },
+        "cost_offchain": {
+          "type": "string",
+          "format": "int64",
+          "title": "Off-chain routing fees"
         }
       }
     },

store_mock_test.go

@@ -13,14 +13,14 @@ import (
 // storeMock implements a mock client swap store.
 type storeMock struct {
 	loopOutSwaps      map[lntypes.Hash]*loopdb.LoopOutContract
-	loopOutUpdates    map[lntypes.Hash][]loopdb.SwapState
+	loopOutUpdates    map[lntypes.Hash][]loopdb.SwapStateData
 	loopOutStoreChan  chan loopdb.LoopOutContract
-	loopOutUpdateChan chan loopdb.SwapState
+	loopOutUpdateChan chan loopdb.SwapStateData
 
 	loopInSwaps      map[lntypes.Hash]*loopdb.LoopInContract
-	loopInUpdates    map[lntypes.Hash][]loopdb.SwapState
+	loopInUpdates    map[lntypes.Hash][]loopdb.SwapStateData
 	loopInStoreChan  chan loopdb.LoopInContract
-	loopInUpdateChan chan loopdb.SwapState
+	loopInUpdateChan chan loopdb.SwapStateData
 
 	t *testing.T
 }
@@ -34,14 +34,14 @@ type finishData struct {
 func newStoreMock(t *testing.T) *storeMock {
 	return &storeMock{
 		loopOutStoreChan:  make(chan loopdb.LoopOutContract, 1),
-		loopOutUpdateChan: make(chan loopdb.SwapState, 1),
+		loopOutUpdateChan: make(chan loopdb.SwapStateData, 1),
 		loopOutSwaps:      make(map[lntypes.Hash]*loopdb.LoopOutContract),
-		loopOutUpdates:    make(map[lntypes.Hash][]loopdb.SwapState),
+		loopOutUpdates:    make(map[lntypes.Hash][]loopdb.SwapStateData),
 
 		loopInStoreChan:  make(chan loopdb.LoopInContract, 1),
-		loopInUpdateChan: make(chan loopdb.SwapState, 1),
+		loopInUpdateChan: make(chan loopdb.SwapStateData, 1),
 		loopInSwaps:      make(map[lntypes.Hash]*loopdb.LoopInContract),
-		loopInUpdates:    make(map[lntypes.Hash][]loopdb.SwapState),
+		loopInUpdates:    make(map[lntypes.Hash][]loopdb.SwapStateData),
 		t:                t,
 	}
 }
@@ -57,7 +57,7 @@ func (s *storeMock) FetchLoopOutSwaps() ([]*loopdb.LoopOut, error) {
 		events := make([]*loopdb.LoopEvent, len(updates))
 		for i, u := range updates {
 			events[i] = &loopdb.LoopEvent{
-				State: u,
+				SwapStateData: u,
 			}
 		}
 
@@ -86,7 +86,7 @@ func (s *storeMock) CreateLoopOut(hash lntypes.Hash,
 	}
 
 	s.loopOutSwaps[hash] = swap
-	s.loopOutUpdates[hash] = []loopdb.SwapState{}
+	s.loopOutUpdates[hash] = []loopdb.SwapStateData{}
 	s.loopOutStoreChan <- *swap
 
 	return nil
@@ -101,7 +101,7 @@ func (s *storeMock) FetchLoopInSwaps() ([]*loopdb.LoopIn, error) {
 		events := make([]*loopdb.LoopEvent, len(updates))
 		for i, u := range updates {
 			events[i] = &loopdb.LoopEvent{
-				State: u,
+				SwapStateData: u,
 			}
 		}
 
@@ -130,7 +130,7 @@ func (s *storeMock) CreateLoopIn(hash lntypes.Hash,
 	}
 
 	s.loopInSwaps[hash] = swap
-	s.loopInUpdates[hash] = []loopdb.SwapState{}
+	s.loopInUpdates[hash] = []loopdb.SwapStateData{}
 	s.loopInStoreChan <- *swap
 
 	return nil
@@ -142,7 +142,7 @@ func (s *storeMock) CreateLoopIn(hash lntypes.Hash,
 //
 // NOTE: Part of the loopdb.SwapStore interface.
 func (s *storeMock) UpdateLoopOut(hash lntypes.Hash, time time.Time,
-	state loopdb.SwapState) error {
+	state loopdb.SwapStateData) error {
 
 	updates, ok := s.loopOutUpdates[hash]
 	if !ok {
@@ -162,7 +162,7 @@ func (s *storeMock) UpdateLoopOut(hash lntypes.Hash, time time.Time,
 //
 // NOTE: Part of the loopdb.SwapStore interface.
 func (s *storeMock) UpdateLoopIn(hash lntypes.Hash, time time.Time,
-	state loopdb.SwapState) error {
+	state loopdb.SwapStateData) error {
 
 	updates, ok := s.loopInUpdates[hash]
 	if !ok {
@@ -215,7 +215,7 @@ func (s *storeMock) assertLoopInState(expectedState loopdb.SwapState) {
 	s.t.Helper()
 
 	state := <-s.loopOutUpdateChan
-	if state != expectedState {
+	if state.State != expectedState {
 		s.t.Fatalf("unexpected state")
 	}
 }
@@ -226,7 +226,7 @@ func (s *storeMock) assertStorePreimageReveal() {
 
 	select {
 	case state := <-s.loopOutUpdateChan:
-		if state != loopdb.StatePreimageRevealed {
+		if state.State != loopdb.StatePreimageRevealed {
 			s.t.Fatalf("unexpected state")
 		}
 	case <-time.After(test.Timeout):
@@ -239,7 +239,7 @@ func (s *storeMock) assertStoreFinished(expectedResult loopdb.SwapState) {
 
 	select {
 	case state := <-s.loopOutUpdateChan:
-		if state != expectedResult {
+		if state.State != expectedResult {
 			s.t.Fatalf("expected result %v, but got %v",
 				expectedResult, state)
 		}

swap.go

@@ -19,7 +19,7 @@ type swapKit struct {
 	log *SwapLog
 
 	lastUpdateTime time.Time
-	cost           SwapCost
+	cost           loopdb.SwapCost
 	state          loopdb.SwapState
 	executeConfig
 	swapConfig
@@ -68,8 +68,11 @@ func (s *swapKit) sendUpdate(ctx context.Context) error {
 		SwapHash:     s.hash,
 		SwapType:     s.swapType,
 		LastUpdate:   s.lastUpdateTime,
-		State:        s.state,
-		HtlcAddress:  s.htlc.Address,
+		SwapStateData: loopdb.SwapStateData{
+			State: s.state,
+			Cost:  s.cost,
+		},
+		HtlcAddress: s.htlc.Address,
 	}
 
 	s.log.Infof("state %v", info.State)

testcontext_test.go

@@ -79,9 +79,9 @@ func createClientTestContext(t *testing.T,
 	for _, s := range pendingSwaps {
 		store.loopOutSwaps[s.Hash] = s.Contract
 
-		updates := []loopdb.SwapState{}
+		updates := []loopdb.SwapStateData{}
 		for _, e := range s.Events {
-			updates = append(updates, e.State)
+			updates = append(updates, e.SwapStateData)
 		}
 		store.loopOutUpdates[s.Hash] = updates
 	}