multi: fix linter

payments/db/codec.go

@@ -2,6 +2,7 @@ package paymentsdb
 
 import (
 	"encoding/binary"
+	"errors"
 	"io"
 	"time"
 
@@ -19,21 +20,20 @@ type UnknownElementType = channeldb.UnknownElementType
 func ReadElement(r io.Reader, element interface{}) error {
 	err := channeldb.ReadElement(r, element)
 	switch {
-
 	// Known to channeldb codec.
 	case err == nil:
 		return nil
 
 	// Fail if error is not UnknownElementType.
 	default:
-		if _, ok := err.(UnknownElementType); !ok {
+		var unknownElementType UnknownElementType
+		if !errors.As(err, &unknownElementType) {
 			return err
 		}
 	}
 
 	// Process any paymentsdb-specific extensions to the codec.
 	switch e := element.(type) {
-
 	case *paymentIndexType:
 		if err := binary.Read(r, byteOrder, e); err != nil {
 			return err
@@ -53,21 +53,20 @@ func ReadElement(r io.Reader, element interface{}) error {
 func WriteElement(w io.Writer, element interface{}) error {
 	err := channeldb.WriteElement(w, element)
 	switch {
-
 	// Known to channeldb codec.
 	case err == nil:
 		return nil
 
 	// Fail if error is not UnknownElementType.
 	default:
-		if _, ok := err.(UnknownElementType); !ok {
+		var unknownElementType UnknownElementType
+		if !errors.As(err, &unknownElementType) {
 			return err
 		}
 	}
 
 	// Process any paymentsdb-specific extensions to the codec.
 	switch e := element.(type) {
-
 	case paymentIndexType:
 		if err := binary.Write(w, byteOrder, e); err != nil {
 			return err
@@ -137,5 +136,6 @@ func serializeTime(w io.Writer, t time.Time) error {
 
 	byteOrder.PutUint64(scratch[:], uint64(unixNano))
 	_, err := w.Write(scratch[:])
+
 	return err
 }

payments/db/kv_store_test.go

@@ -954,7 +954,6 @@ func TestKVPaymentsDBMultiShard(t *testing.T) {
 	}
 
 	for _, test := range tests {
-		test := test
 		subTest := fmt.Sprintf("first=%v, second=%v",
 			test.settleFirst, test.settleLast)
 
@@ -1643,9 +1642,8 @@ func TestFetchPaymentWithSequenceNumber(t *testing.T) {
 	}
 
 	for _, test := range tests {
-		test := test
-
 		t.Run(test.name, func(t *testing.T) {
+			//nolint:ll
 			err := kvdb.Update(
 				paymentDB.db, func(tx walletdb.ReadWriteTx) error {
 					var seqNrBytes [8]byte

payments/db/log.go

@@ -8,8 +8,6 @@ import (
 // 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.
-//
-//nolint:unused
 var log btclog.Logger
 
 // Subsystem defines the logging identifier for this subsystem.

payments/db/payment.go

@@ -255,8 +255,8 @@ const (
 	// reason.
 	HTLCFailUnknown HTLCFailReason = 0
 
-	// HTLCFailUnreadable is recorded for htlcs that had a failure message that
-	// couldn't be decrypted.
+	// HTLCFailUnreadable is recorded for htlcs that had a failure message
+	// that couldn't be decrypted.
 	HTLCFailUnreadable HTLCFailReason = 1
 
 	// HTLCFailInternal is recorded for htlcs that failed because of an

payments/db/payment_test.go

@@ -60,19 +60,6 @@ var (
 		LegacyPayload:    true,
 	}
 
-	testHop3 = &route.Hop{
-		PubKeyBytes:      route.NewVertex(pub),
-		ChannelID:        12345,
-		OutgoingTimeLock: 111,
-		AmtToForward:     555,
-		CustomRecords: record.CustomSet{
-			65536: []byte{},
-			80001: []byte{},
-		},
-		AMP:      record.NewAMP([32]byte{0x69}, [32]byte{0x42}, 1),
-		Metadata: []byte{1, 2, 3},
-	}
-
 	testRoute = route.Route{
 		TotalTimeLock: 123,
 		TotalAmount:   1234567,