lnwire21: update Msat and TrueBoolean

Add the TrueBoolean type along with its Record method. Also update the
Millisatoshi type with a Record method. Both of these will be used in an
upcoming commit which adjusts a mission control migration to use pure
TLV types.

channeldb/migration/lnwire21/msat.go

@@ -2,8 +2,10 @@ package lnwire
 
 import (
 	"fmt"
+	"io"
 
 	"github.com/btcsuite/btcd/btcutil"
+	"github.com/lightningnetwork/lnd/tlv"
 )
 
 const (
@@ -49,3 +51,39 @@ func (m MilliSatoshi) String() string {
 }
 
 // TODO(roasbeef): extend with arithmetic operations?
+
+// Record returns a TLV record that can be used to encode/decode a MilliSatoshi
+// to/from a TLV stream.
+func (m *MilliSatoshi) Record() tlv.Record {
+	return tlv.MakeDynamicRecord(
+		0, m, tlv.SizeBigSize(m), encodeMilliSatoshis,
+		decodeMilliSatoshis,
+	)
+}
+func encodeMilliSatoshis(w io.Writer, val interface{}, buf *[8]byte) error {
+	if v, ok := val.(*MilliSatoshi); ok {
+		bigSize := uint64(*v)
+
+		return tlv.EBigSize(w, &bigSize, buf)
+	}
+
+	return tlv.NewTypeForEncodingErr(val, "lnwire.MilliSatoshi")
+}
+
+func decodeMilliSatoshis(r io.Reader, val interface{}, buf *[8]byte,
+	l uint64) error {
+
+	if v, ok := val.(*MilliSatoshi); ok {
+		var bigSize uint64
+		err := tlv.DBigSize(r, &bigSize, buf, l)
+		if err != nil {
+			return err
+		}
+
+		*v = MilliSatoshi(bigSize)
+
+		return nil
+	}
+
+	return tlv.NewTypeForDecodingErr(val, "lnwire.MilliSatoshi", l, l)
+}

channeldb/migration/lnwire21/true_boolean.go

@@ -0,0 +1,37 @@
+package lnwire
+
+import (
+	"io"
+
+	"github.com/lightningnetwork/lnd/tlv"
+)
+
+// TrueBoolean is a record that indicates true or false using the presence of
+// the record. If the record is absent, it indicates false. If it is present,
+// it indicates true.
+type TrueBoolean struct{}
+
+// Record returns the tlv record for the boolean entry.
+func (b *TrueBoolean) Record() tlv.Record {
+	return tlv.MakeStaticRecord(
+		0, b, 0, booleanEncoder, booleanDecoder,
+	)
+}
+
+func booleanEncoder(_ io.Writer, val interface{}, _ *[8]byte) error {
+	if _, ok := val.(*TrueBoolean); ok {
+		return nil
+	}
+
+	return tlv.NewTypeForEncodingErr(val, "TrueBoolean")
+}
+
+func booleanDecoder(_ io.Reader, val interface{}, _ *[8]byte,
+	l uint64) error {
+
+	if _, ok := val.(*TrueBoolean); ok && (l == 0 || l == 1) {
+		return nil
+	}
+
+	return tlv.NewTypeForEncodingErr(val, "TrueBoolean")
+}

lnwire/channel_update_2.go

@@ -411,7 +411,7 @@ func decodeDisableFlags(r io.Reader, val interface{}, buf *[8]byte,
 }
 
 // TrueBoolean is a record that indicates true or false using the presence of
-// the record. If the record is absent, it indicates false. If it is presence,
+// the record. If the record is absent, it indicates false. If it is present,
 // it indicates true.
 type TrueBoolean struct{}