lnwire: re-add .String() to the lnwire.Message interface

lnwire/message.go

@@ -69,6 +69,7 @@ type Message interface {
 	Command() uint32
 	MaxPayloadLength(uint32) uint32
 	Validate() error
+	String() string
 }
 
 // makeEmptyMessage creates a new empty message of the proper concrete type

lnwire/ping.go

@@ -1,6 +1,9 @@
 package lnwire
 
-import "io"
+import (
+	"fmt"
+	"io"
+)
 
 // Pong defines a message which is the direct response to a received Ping
 // message. A Pong reply indicates that a connection is still active. The Pong
@@ -75,3 +78,10 @@ func (p *Pong) MaxPayloadLength(uint32) uint32 {
 func (p *Pong) Validate() error {
 	return nil
 }
+
+// String returns the string representation of the target Pong.
+//
+// This is part of the lnwire.Message interface.
+func (p *Pong) String() string {
+	return fmt.Sprintf("Pong(%v)", p.Nonce)
+}

lnwire/pong.go

@@ -1,6 +1,9 @@
 package lnwire
 
-import "io"
+import (
+	"fmt"
+	"io"
+)
 
 // Ping defines a message which is sent by peers periodically to determine if
 // the connection is still valid. Each ping message should carry a unique nonce
@@ -74,3 +77,10 @@ func (p Ping) MaxPayloadLength(uint32) uint32 {
 func (p *Ping) Validate() error {
 	return nil
 }
+
+// String returns the string representation of the target Ping.
+//
+// This is part of the lnwire.Message interface.
+func (p *Ping) String() string {
+	return fmt.Sprintf("Ping(%v)", p.Nonce)
+}