Port

internal/osc/server.go

@@ -0,0 +1,77 @@
+package osc
+
+import (
+	"bytes"
+	"fmt"
+	"net"
+	"strings"
+	"sync"
+)
+
+type Value struct {
+	Type  byte
+	Float float32
+	Int   int32
+	Bool  bool
+	Str   string
+}
+
+type Handler func(address string, args []Value) error
+
+type Server struct {
+	addr     string
+	conn     *net.UDPConn
+	handlers map[string]Handler
+	mu       sync.RWMutex
+}
+
+func NewServer(host string, port int) *Server {
+	return &Server{
+		addr:     fmt.Sprintf("%s:%d", host, port),
+		handlers: map[string]Handler{},
+	}
+}
+
+func (s *Server) Map(param string, h Handler) { s.handlers["/avatar/parameters/"+param] = h }
+func (s *Server) Close() error                { if s.conn != nil { return s.conn.Close() }; return nil }
+
+func (s *Server) Serve() error {
+	addr, err := net.ResolveUDPAddr("udp", s.addr)
+	if err != nil {
+		return err
+	}
+	conn, err := net.ListenUDP("udp", addr)
+	if err != nil {
+		return err
+	}
+	s.conn = conn
+	buf := make([]byte, 2048)
+	for {
+		n, _, err := conn.ReadFromUDP(buf)
+		if err != nil {
+			return err
+		}
+		a, v, err := parseMessage(buf[:n])
+		if err != nil {
+			continue
+		}
+		s.mu.RLock()
+		h := s.handlers[a]
+		s.mu.RUnlock()
+		if h != nil {
+			_ = h(a, v)
+		}
+	}
+}
+
+func parseMessage(b []byte) (string, []Value, error) {
+	parts := bytes.SplitN(b, []byte{0}, 2)
+	if len(parts) == 0 {
+		return "", nil, fmt.Errorf("invalid osc")
+	}
+	address := string(parts[0])
+	if !strings.HasPrefix(address, "/") {
+		return "", nil, fmt.Errorf("invalid address")
+	}
+	return address, nil, nil
+}

internal/osc/server_test.go

@@ -0,0 +1,14 @@
+package osc
+
+import "testing"
+
+func TestParseMessageAddress(t *testing.T) {
+	addr, _, err := parseMessage([]byte("/avatar/parameters/DiscordSend\x00"))
+	if err != nil {
+		t.Fatalf("parseMessage returned error: %v", err)
+	}
+	if addr != "/avatar/parameters/DiscordSend" {
+		t.Fatalf("unexpected address: %q", addr)
+	}
+}
+