multi: Removed deprecated interfacer linter

Removed the deprecated interfacer linter from being called for linting.

Also removed the `nolint:interfacer` within the code.

https://github.com/lightningnetwork/lnd/issues/5741

.golangci.yml

@@ -58,6 +58,9 @@ linters:
   # Init functions are used by loggers throughout the codebase.
   - gochecknoinits
 
+  # interfacer has been archived.
+  - interfacer
+
 issues:
   # Only show newly introduced problems.
   new-from-rev: 01f696afce2f9c0d4ed854edefa3846891d01d8a

channeldb/channel.go

@@ -882,8 +882,9 @@ func fetchChanBucket(tx kvdb.RTx, nodeKey *btcec.PublicKey,
 // channel's data resides in given: the public key for the node, the outpoint,
 // and the chainhash that the channel resides on. This differs from
 // fetchChanBucket in that it returns a writeable bucket.
-func fetchChanBucketRw(tx kvdb.RwTx, nodeKey *btcec.PublicKey, // nolint:interfacer
-	outPoint *wire.OutPoint, chainHash chainhash.Hash) (kvdb.RwBucket, error) {
+func fetchChanBucketRw(tx kvdb.RwTx, nodeKey *btcec.PublicKey,
+	outPoint *wire.OutPoint, chainHash chainhash.Hash) (kvdb.RwBucket,
+	error) {
 
 	// First fetch the top level bucket which stores all data related to
 	// current, active channels.

channeldb/graph.go

@@ -578,7 +578,9 @@ func (c *ChannelGraph) DisabledChannelIDs() ([]uint64, error) {
 //
 // TODO(roasbeef): add iterator interface to allow for memory efficient graph
 // traversal when graph gets mega
-func (c *ChannelGraph) ForEachNode(cb func(kvdb.RTx, *LightningNode) error) error { // nolint:interfacer
+func (c *ChannelGraph) ForEachNode(
+	cb func(kvdb.RTx, *LightningNode) error) error {
+
 	traversal := func(tx kvdb.RTx) error {
 		// First grab the nodes bucket which stores the mapping from
 		// pubKey to node information.

channeldb/payments.go

@@ -731,7 +731,9 @@ func fetchPaymentWithSequenceNumber(tx kvdb.RTx, paymentHash lntypes.Hash,
 // DeletePayment deletes a payment from the DB given its payment hash. If
 // failedHtlcsOnly is set, only failed HTLC attempts of the payment will be
 // deleted.
-func (d *DB) DeletePayment(paymentHash lntypes.Hash, failedHtlcsOnly bool) error { // nolint:interfacer
+func (d *DB) DeletePayment(paymentHash lntypes.Hash,
+	failedHtlcsOnly bool) error {
+
 	return kvdb.Update(d, func(tx kvdb.RwTx) error {
 		payments := tx.ReadWriteBucket(paymentsRootBucket)
 		if payments == nil {

lntest/harness_net.go

@@ -1351,7 +1351,6 @@ func (n *NetworkHarness) WaitForChannelClose(
 // an optional set of check functions which can be used to make further
 // assertions using channel's values. These functions are responsible for
 // failing the test themselves if they do not pass.
-// nolint: interfacer
 func (n *NetworkHarness) AssertChannelExists(node *HarnessNode,
 	chanPoint *wire.OutPoint, checks ...func(*lnrpc.Channel)) error {
 

lntest/itest/assertions.go

@@ -589,9 +589,8 @@ func shutdownAndAssert(net *lntest.NetworkHarness, t *harnessTest,
 
 // assertChannelBalanceResp makes a ChannelBalance request and checks the
 // returned response matches the expected.
-func assertChannelBalanceResp(t *harnessTest,
-	node *lntest.HarnessNode,
-	expected *lnrpc.ChannelBalanceResponse) { // nolint:interfacer
+func assertChannelBalanceResp(t *harnessTest, node *lntest.HarnessNode,
+	expected *lnrpc.ChannelBalanceResponse) {
 
 	resp := getChannelBalance(t, node)
 	require.True(t.t, proto.Equal(expected, resp), "balance is incorrect")

lnwire/writer.go

@@ -50,32 +50,20 @@ func ErrOutpointIndexTooBig(index uint32) error {
 }
 
 // WriteBytes appends the given bytes to the provided buffer.
-//
-// Note: We intentionally skip the interfacer linter check here because we want
-// to have concrete type (bytes.Buffer) rather than interface type (io.Write)
-// due to performance concern.
-func WriteBytes(buf *bytes.Buffer, b []byte) error { // nolint: interfacer
+func WriteBytes(buf *bytes.Buffer, b []byte) error {
 	_, err := buf.Write(b)
 	return err
 }
 
 // WriteUint8 appends the uint8 to the provided buffer.
-//
-// Note: We intentionally skip the interfacer linter check here because we want
-// to have concrete type (bytes.Buffer) rather than interface type (io.Write)
-// due to performance concern.
-func WriteUint8(buf *bytes.Buffer, n uint8) error { // nolint: interfacer
+func WriteUint8(buf *bytes.Buffer, n uint8) error {
 	_, err := buf.Write([]byte{n})
 	return err
 }
 
 // WriteUint16 appends the uint16 to the provided buffer. It encodes the
 // integer using big endian byte order.
-//
-// Note: We intentionally skip the interfacer linter check here because we want
-// to have concrete type (bytes.Buffer) rather than interface type (io.Write)
-// due to performance concern.
-func WriteUint16(buf *bytes.Buffer, n uint16) error { // nolint: interfacer
+func WriteUint16(buf *bytes.Buffer, n uint16) error {
 	var b [2]byte
 	binary.BigEndian.PutUint16(b[:], n)
 	_, err := buf.Write(b[:])
@@ -93,11 +81,7 @@ func WriteUint32(buf *bytes.Buffer, n uint32) error {
 
 // WriteUint64 appends the uint64 to the provided buffer. It encodes the
 // integer using big endian byte order.
-//
-// Note: We intentionally skip the interfacer linter check here because we want
-// to have concrete type (bytes.Buffer) rather than interface type (io.Write)
-// due to performance concern.
-func WriteUint64(buf *bytes.Buffer, n uint64) error { // nolint: interfacer
+func WriteUint64(buf *bytes.Buffer, n uint64) error {
 	var b [8]byte
 	binary.BigEndian.PutUint64(b[:], n)
 	_, err := buf.Write(b[:])
@@ -194,13 +178,7 @@ func WriteFailCode(buf *bytes.Buffer, e FailCode) error {
 // WriteRawFeatureVector encodes the feature using the feature's Encode method
 // and appends the data to the provided buffer. An error will return if the
 // passed feature is nil.
-//
-// Note: We intentionally skip the interfacer linter check here because we want
-// to have concrete type (bytes.Buffer) rather than interface type (io.Write)
-// due to performance concern.
-func WriteRawFeatureVector(buf *bytes.Buffer, // nolint: interfacer
-	feature *RawFeatureVector) error {
-
+func WriteRawFeatureVector(buf *bytes.Buffer, feature *RawFeatureVector) error {
 	if feature == nil {
 		return ErrNilFeatureVector
 	}
@@ -280,11 +258,7 @@ func WriteBool(buf *bytes.Buffer, b bool) error {
 
 // WritePkScript appends the script to the provided buffer. Returns an error if
 // the provided script exceeds 34 bytes.
-//
-// Note: We intentionally skip the interfacer linter check here because we want
-// to have concrete type (bytes.Buffer) rather than interface type (io.Write)
-// due to performance concern.
-func WritePkScript(buf *bytes.Buffer, s PkScript) error { // nolint: interfacer
+func WritePkScript(buf *bytes.Buffer, s PkScript) error {
 	// The largest script we'll accept is a p2wsh which is exactly
 	// 34 bytes long.
 	scriptLength := len(s)
@@ -412,13 +386,7 @@ func WriteNetAddrs(buf *bytes.Buffer, addresses []net.Addr) error {
 }
 
 // writeDataWithLength writes the data and its length to the buffer.
-//
-// Note: We intentionally skip the interfacer linter check here because we want
-// to have concrete type (bytes.Buffer) rather than interface type (io.Write)
-// due to performance concern.
-func writeDataWithLength(buf *bytes.Buffer, // nolint: interfacer
-	data []byte) error {
-
+func writeDataWithLength(buf *bytes.Buffer, data []byte) error {
 	var l [2]byte
 	binary.BigEndian.PutUint16(l[:], uint16(len(data)))
 	if _, err := buf.Write(l[:]); err != nil {