add posistagenet client

psn-client.go

@@ -0,0 +1,96 @@
+package showbridge
+
+import (
+	"fmt"
+	"log/slog"
+	"net"
+	"time"
+
+	"github.com/jwetzell/psn-go"
+)
+
+type PSNClient struct {
+	config  ModuleConfig
+	conn    *net.UDPConn
+	router  *Router
+	decoder *psn.Decoder
+}
+
+func init() {
+	RegisterModule(ModuleRegistration{
+		Type: "net.psn.client",
+		New: func(config ModuleConfig) (Module, error) {
+
+			return &PSNClient{config: config, decoder: psn.NewDecoder()}, nil
+		},
+	})
+}
+
+func (uc *PSNClient) Id() string {
+	return uc.config.Id
+}
+
+func (uc *PSNClient) Type() string {
+	return uc.config.Type
+}
+
+func (uc *PSNClient) RegisterRouter(router *Router) {
+	uc.router = router
+}
+
+func (uc *PSNClient) Run() error {
+
+	addr, err := net.ResolveUDPAddr("udp", "236.10.10.10:56565")
+	if err != nil {
+		return err
+	}
+
+	client, err := net.ListenMulticastUDP("udp", nil, addr)
+	if err != nil {
+		return err
+	}
+	defer client.Close()
+
+	uc.conn = client
+
+	buffer := make([]byte, 2048)
+	for {
+		select {
+		case <-uc.router.Context.Done():
+			// TODO(jwetzell): cleanup?
+			slog.Debug("router context done in module", "id", uc.config.Id)
+			return nil
+		default:
+			uc.conn.SetDeadline(time.Now().Add(time.Millisecond * 200))
+
+			numBytes, _, err := uc.conn.ReadFromUDP(buffer)
+			if err != nil {
+				//NOTE(jwetzell) we hit deadline
+				if opErr, ok := err.(*net.OpError); ok && opErr.Timeout() {
+					continue
+				}
+				return err
+			}
+
+			if numBytes > 0 {
+				message := buffer[:numBytes]
+				err := uc.decoder.Decode(message)
+				if err != nil {
+					slog.Error("net.psn.client problem decoding psn traffic", "id", uc.config.Id, "error", err)
+				}
+
+				if uc.router != nil {
+					for _, tracker := range uc.decoder.Trackers {
+						uc.router.HandleInput(uc.config.Id, tracker)
+					}
+				} else {
+					slog.Error("net.psn.client has no router", "id", uc.config.Id)
+				}
+			}
+		}
+	}
+}
+
+func (uc *PSNClient) Output(payload any) error {
+	return fmt.Errorf("net.psn.client output is not implemented")
+}