add basic midi client

go.mod

@@ -10,6 +10,7 @@ require (
 
 require (
 	github.com/gorilla/websocket v1.5.3 // indirect
+	gitlab.com/gomidi/midi/v2 v2.3.16 // indirect
 	golang.org/x/net v0.44.0 // indirect
 	golang.org/x/sync v0.17.0 // indirect
 )

go.sum

@@ -12,6 +12,8 @@ github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu
 github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
 github.com/urfave/cli/v3 v3.6.0 h1:oIdArVjkdIXHWg3iqxgmqwQGC8NM0JtdgwQAj2sRwFo=
 github.com/urfave/cli/v3 v3.6.0/go.mod h1:ysVLtOEmg2tOy6PknnYVhDoouyC/6N42TMeoMzskhso=
+gitlab.com/gomidi/midi/v2 v2.3.16 h1:yufWSENyjnJ4LFQa9BerzUm4E4aLfTyzw5nmnCteO0c=
+gitlab.com/gomidi/midi/v2 v2.3.16/go.mod h1:jDpP4O4skYi+7iVwt6Zyp18bd2M4hkjtMuw2cmgKgfw=
 golang.org/x/net v0.44.0 h1:evd8IRDyfNBMBTTY5XRF1vaZlD+EmWx6x8PkhR04H/I=
 golang.org/x/net v0.44.0/go.mod h1:ECOoLqd5U3Lhyeyo/QDCEVQ4sNgYsqvCZ722XogGieY=
 golang.org/x/sync v0.17.0 h1:l60nONMj9l5drqw6jlhIELNv9I0A4OFgRsG9k2oT9Ug=

midi-client.go

@@ -0,0 +1,114 @@
+package showbridge
+
+import (
+	"fmt"
+	"log/slog"
+
+	"gitlab.com/gomidi/midi/v2"
+	_ "gitlab.com/gomidi/midi/v2/drivers/rtmididrv" // autoregisters driver
+)
+
+type MIDIClient struct {
+	config     ModuleConfig
+	router     *Router
+	InputPort  string
+	OutputPort string
+	SendFunc   func(midi.Message) error
+}
+
+func init() {
+	RegisterModule(ModuleRegistration{
+		Type: "misc.midi.client",
+		New: func(config ModuleConfig) (Module, error) {
+			params := config.Params
+			input, ok := params["input"]
+
+			if !ok {
+				return nil, fmt.Errorf("net.mqtt.client requires a input parameter")
+			}
+
+			inputString, ok := input.(string)
+
+			if !ok {
+				return nil, fmt.Errorf("misc.midi.client input must be a string")
+			}
+
+			output, ok := params["output"]
+
+			if !ok {
+				return nil, fmt.Errorf("net.mqtt.client requires a output parameter")
+			}
+
+			outputString, ok := output.(string)
+
+			if !ok {
+				return nil, fmt.Errorf("misc.midi.client output must be a string")
+			}
+
+			return &MIDIClient{config: config, InputPort: inputString, OutputPort: outputString}, nil
+		},
+	})
+}
+
+func (mc *MIDIClient) Id() string {
+	return mc.config.Id
+}
+
+func (mc *MIDIClient) Type() string {
+	return mc.config.Type
+}
+
+func (mc *MIDIClient) RegisterRouter(router *Router) {
+	mc.router = router
+}
+
+func (mc *MIDIClient) Run() error {
+	defer midi.CloseDriver()
+
+	in, err := midi.FindInPort(mc.InputPort)
+	if err != nil {
+		return fmt.Errorf("misc.midi.client can't find input port: %s", mc.InputPort)
+	}
+
+	stop, err := midi.ListenTo(in, func(msg midi.Message, timestampms int32) {
+		if mc.router != nil {
+			mc.router.HandleInput(mc.Id(), msg)
+		}
+	}, midi.UseSysEx())
+	defer stop()
+
+	out, err := midi.FindOutPort(mc.OutputPort)
+
+	if err != nil {
+		return fmt.Errorf("misc.midi.client can't find output port: %s", mc.OutputPort)
+	}
+
+	send, err := midi.SendTo(out)
+	if err != nil {
+		return err
+	}
+
+	mc.SendFunc = send
+
+	if err != nil {
+		return err
+	}
+
+	<-mc.router.Context.Done()
+	slog.Debug("router context done in module", "id", mc.config.Id)
+	return nil
+}
+
+func (mc *MIDIClient) Output(payload any) error {
+	if mc.SendFunc == nil {
+		return fmt.Errorf("misc.midi.client output is not setup")
+	}
+
+	payloadMessage, ok := payload.(midi.Message)
+
+	if !ok {
+		return fmt.Errorf("misc.midi.client can only ouptut midi.Message")
+	}
+
+	return mc.SendFunc(payloadMessage)
+}