multi: ignore non-peerswap messages

Ignore custom messages that are not relevant to peerswap.
Additionally, it refactors the existing message conversion logic
for better clarity and maintainability.
FIxes #305

messages/errors.go

@@ -2,10 +2,27 @@ package messages
 
 import "fmt"
 
-var (
-	ErrEvenMessageType   = fmt.Errorf("message type is even")
-	ErrMessageNotInRange = fmt.Errorf("message type not in range")
-)
+// ErrNotPeerswapCustomMessage represents an error indicating
+// that the message type is not a peerswap custom message.
+type ErrNotPeerswapCustomMessage struct {
+	MessageType string
+}
+
+// NewErrNotPeerswapCustomMessage creates a new ErrNotPeerswapCustomMessage with the given message type.
+func NewErrNotPeerswapCustomMessage(messageType string) ErrNotPeerswapCustomMessage {
+	return ErrNotPeerswapCustomMessage{MessageType: messageType}
+}
+
+// Error returns the error message for ErrNotPeerswapCustomMessage.
+func (e ErrNotPeerswapCustomMessage) Error() string {
+	return fmt.Sprintf("message type %s is not a peerswap custom message", e.MessageType)
+}
+
+// Is checks if the target error is of type ErrNotPeerswapCustomMessage.
+func (e ErrNotPeerswapCustomMessage) Is(target error) bool {
+	_, ok := target.(*ErrNotPeerswapCustomMessage)
+	return ok
+}
 
 type ErrAlreadyHasASender string
 

messages/types.go

@@ -35,41 +35,45 @@ const (
 	MESSAGETYPE_POLL
 	_
 	MESSAGETYPE_REQUEST_POLL
-	UPPER_MESSAGE_BOUND
 )
 
-// InRange checks if the message type lays in the
-// peerswap message range.
-func InRange(msgType MessageType) (bool, error) {
-	// MessageType we do not accept even message types
-	if msgType%2 == 0 {
-		return false, ErrEvenMessageType
+// PeerswapCustomMessageType converts a hexadecimal string representation of a message type
+// to its corresponding MessageType. If the message type is not recognized, it returns an error.
+func PeerswapCustomMessageType(msgType string) (MessageType, error) {
+	// Parse the hexadecimal string to an integer.
+	msgTypeInt, err := strconv.ParseInt(msgType, 16, 64)
+	if err != nil {
+		return 0, fmt.Errorf("could not parse hex string to message type: %w", err)
+	}
+
+	// Match the parsed integer to the corresponding MessageType.
+	switch MessageType(msgTypeInt) {
+	case MESSAGETYPE_SWAPINREQUEST:
+		return MESSAGETYPE_SWAPINREQUEST, nil
+	case MESSAGETYPE_SWAPOUTREQUEST:
+		return MESSAGETYPE_SWAPOUTREQUEST, nil
+	case MESSAGETYPE_SWAPINAGREEMENT:
+		return MESSAGETYPE_SWAPINAGREEMENT, nil
+	case MESSAGETYPE_SWAPOUTAGREEMENT:
+		return MESSAGETYPE_SWAPOUTAGREEMENT, nil
+	case MESSAGETYPE_OPENINGTXBROADCASTED:
+		return MESSAGETYPE_OPENINGTXBROADCASTED, nil
+	case MESSAGETYPE_CANCELED:
+		return MESSAGETYPE_CANCELED, nil
+	case MESSAGETYPE_COOPCLOSE:
+		return MESSAGETYPE_COOPCLOSE, nil
+	case MESSAGETYPE_POLL:
+		return MESSAGETYPE_POLL, nil
+	case MESSAGETYPE_REQUEST_POLL:
+		return MESSAGETYPE_REQUEST_POLL, nil
+	default:
+		// Return an error if the message type is not recognized.
+		return 0, NewErrNotPeerswapCustomMessage(msgType)
 	}
-	return BASE_MESSAGE_TYPE <= msgType && msgType < UPPER_MESSAGE_BOUND, nil
 }
 
 // MessageTypeToHexStr returns the hex encoded string
 // of the messagetype.
 func MessageTypeToHexString(messageIndex MessageType) string {
 	return strconv.FormatInt(int64(messageIndex), 16)
 }
-
-// HexStrToMsgType returns the message type from a
-// hex encoded string.
-func HexStringToMessageType(msgTypeStr string) (MessageType, error) {
-	msgTypeInt, err := strconv.ParseInt(msgTypeStr, 16, 64)
-	if err != nil {
-		return 0, fmt.Errorf("could not parse hex string to message type: %w", err)
-	}
-
-	msgType := MessageType(msgTypeInt)
-
-	inRange, err := InRange(msgType)
-	if err != nil {
-		return 0, err
-	}
-	if !inRange {
-		return 0, ErrMessageNotInRange
-	}
-	return msgType, nil
-}

messages/types_test.go

@@ -0,0 +1,37 @@
+package messages
+
+import "testing"
+
+func TestPeerswapCustomMessageType(t *testing.T) {
+	t.Parallel()
+	tests := map[string]struct {
+		msgType string
+		want    MessageType
+		wantErr bool
+	}{
+		"swapinrequest":       {msgType: MessageTypeToHexString(MESSAGETYPE_SWAPINREQUEST), want: MESSAGETYPE_SWAPINREQUEST},
+		"swapoutrequest":      {msgType: MessageTypeToHexString(MESSAGETYPE_SWAPOUTREQUEST), want: MESSAGETYPE_SWAPOUTREQUEST},
+		"swapinagreement":     {msgType: MessageTypeToHexString(MESSAGETYPE_SWAPINAGREEMENT), want: MESSAGETYPE_SWAPINAGREEMENT},
+		"swapoutagreement":    {msgType: MessageTypeToHexString(MESSAGETYPE_SWAPOUTAGREEMENT), want: MESSAGETYPE_SWAPOUTAGREEMENT},
+		"openintxbroadcasted": {msgType: MessageTypeToHexString(MESSAGETYPE_OPENINGTXBROADCASTED), want: MESSAGETYPE_OPENINGTXBROADCASTED},
+		"canceled":            {msgType: MessageTypeToHexString(MESSAGETYPE_CANCELED), want: MESSAGETYPE_CANCELED},
+		"coopclose":           {msgType: MessageTypeToHexString(MESSAGETYPE_COOPCLOSE), want: MESSAGETYPE_COOPCLOSE},
+		"poll":                {msgType: MessageTypeToHexString(MESSAGETYPE_POLL), want: MESSAGETYPE_POLL},
+		"request_poll":        {msgType: MessageTypeToHexString(MESSAGETYPE_REQUEST_POLL), want: MESSAGETYPE_REQUEST_POLL},
+		"invalid":             {msgType: "invalid", wantErr: true},
+	}
+	for name, tt := range tests {
+		tt := tt
+		t.Run(name, func(t *testing.T) {
+			t.Parallel()
+			got, err := PeerswapCustomMessageType(tt.msgType)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("PeerswapCustomMessageType() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if got != tt.want {
+				t.Errorf("PeerswapCustomMessageType() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}

poll/service.go

@@ -3,6 +3,7 @@ package poll
 import (
 	"context"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"sync"
 	"time"
@@ -167,62 +168,70 @@ func (s *Service) RequestAllPeerPolls() {
 // MessageHandler checks for the incoming messages
 // type and takes the incoming payload to update the
 // store.
-func (s *Service) MessageHandler(peerId string, msgType string, payload []byte) error {
-	messageType, err := messages.HexStringToMessageType(msgType)
+func (s *Service) MessageHandler(peerID, msgType string, payload []byte) error {
+	messageType, err := messages.PeerswapCustomMessageType(msgType)
 	if err != nil {
+		// Check for specific errors: even message type or message out of range
+		// message type that peerswap is not interested in.
+		if errors.Is(err, &messages.ErrNotPeerswapCustomMessage{}) {
+			// These errors are expected and can be handled gracefully
+			return nil
+		}
 		return err
 	}
 
 	switch messageType {
 	case messages.MESSAGETYPE_POLL:
 		var msg PollMessage
-		err = json.Unmarshal(payload, &msg)
-		if err != nil {
-			return err
+		if jerr := json.Unmarshal(payload, &msg); jerr != nil {
+			return jerr
 		}
-		s.store.Update(peerId, PollInfo{
+		if serr := s.store.Update(peerID, PollInfo{
 			ProtocolVersion: msg.Version,
 			Assets:          msg.Assets,
 			PeerAllowed:     msg.PeerAllowed,
 			LastSeen:        time.Now(),
-		})
-		if ti, ok := s.tmpStore[peerId]; ok {
+		}); serr != nil {
+			return serr
+		}
+		if ti, ok := s.tmpStore[peerID]; ok {
 			if ti == string(payload) {
 				return nil
 			}
 		}
 		if msg.Version != swap.PEERSWAP_PROTOCOL_VERSION {
-			log.Debugf("Received poll from INCOMPATIBLE peer %s: %s", peerId, string(payload))
+			log.Debugf("Received poll from INCOMPATIBLE peer %s: %s", peerID, string(payload))
 		} else {
-			log.Debugf("Received poll from peer %s: %s", peerId, string(payload))
+			log.Debugf("Received poll from peer %s: %s", peerID, string(payload))
 		}
-		s.tmpStore[peerId] = string(payload)
+		s.tmpStore[peerID] = string(payload)
 		return nil
 	case messages.MESSAGETYPE_REQUEST_POLL:
 		var msg RequestPollMessage
-		err = json.Unmarshal([]byte(payload), &msg)
-		if err != nil {
-			return err
+		if jerr := json.Unmarshal(payload, &msg); jerr != nil {
+			return jerr
 		}
-		s.store.Update(peerId, PollInfo{
+		if serr := s.store.Update(peerID, PollInfo{
 			ProtocolVersion: msg.Version,
 			Assets:          msg.Assets,
 			PeerAllowed:     msg.PeerAllowed,
 			LastSeen:        time.Now(),
-		})
+		}); serr != nil {
+			return serr
+		}
 		// Send a poll on request
-		s.Poll(peerId)
-		if ti, ok := s.tmpStore[peerId]; ok {
+		s.Poll(peerID)
+		if ti, ok := s.tmpStore[peerID]; ok {
 			if ti == string(payload) {
 				return nil
 			}
 		}
 		if msg.Version != swap.PEERSWAP_PROTOCOL_VERSION {
-			log.Debugf("Received poll from INCOMPATIBLE peer %s: %s", peerId, string(payload))
+			log.Debugf("Received poll from INCOMPATIBLE peer %s: %s", peerID, string(payload))
 		} else {
-			log.Debugf("Received poll from peer %s: %s", peerId, string(payload))
+			log.Debugf("Received poll from peer %s: %s", peerID, string(payload))
 		}
-		s.tmpStore[peerId] = string(payload)
+		s.tmpStore[peerID] = string(payload)
 		return nil
 	default:
 		return nil

swap/service.go

@@ -178,9 +178,14 @@ func (s *SwapService) OnMessageReceived(peerId string, msgTypeString string, pay
 	if len(payload) > 100*1024 {
 		return errors.New("Payload is unexpectedly large")
 	}
-	msgType, err := messages.HexStringToMessageType(msgTypeString)
+	msgType, err := messages.PeerswapCustomMessageType(msgTypeString)
 	if err != nil {
-		return err
+		// Check for specific errors: even message type or message out of range
+		// message type that peerswap is not interested in.
+		if errors.Is(err, &messages.ErrNotPeerswapCustomMessage{}) {
+			// These errors are expected and can be handled gracefully
+			return nil
+		}
 	}
 	msgBytes := []byte(payload)
 	switch msgType {