conver midi.message.create into separate processors

internal/processor/midi-program_change-create.go

@@ -0,0 +1,106 @@
+//go:build cgo
+
+package processor
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"strconv"
+	"text/template"
+
+	"github.com/google/jsonschema-go/jsonschema"
+	"github.com/jwetzell/showbridge-go/internal/common"
+	"github.com/jwetzell/showbridge-go/internal/config"
+	"gitlab.com/gomidi/midi/v2"
+)
+
+type MIDIProgramChangeCreate struct {
+	config  config.ProcessorConfig
+	Channel *template.Template
+	Program *template.Template
+}
+
+func (mpcc *MIDIProgramChangeCreate) Process(ctx context.Context, wrappedPayload common.WrappedPayload) (common.WrappedPayload, error) {
+	templateData := wrappedPayload
+
+	var channelBuffer bytes.Buffer
+	err := mpcc.Channel.Execute(&channelBuffer, templateData)
+
+	if err != nil {
+		wrappedPayload.End = true
+		return wrappedPayload, err
+	}
+
+	channelValue, err := strconv.ParseUint(channelBuffer.String(), 10, 8)
+
+	var programBuffer bytes.Buffer
+	err = mpcc.Program.Execute(&programBuffer, templateData)
+
+	if err != nil {
+		wrappedPayload.End = true
+		return wrappedPayload, err
+	}
+
+	programValue, err := strconv.ParseUint(programBuffer.String(), 10, 8)
+
+	payloadMessage := midi.ProgramChange(uint8(channelValue), uint8(programValue))
+	wrappedPayload.Payload = payloadMessage
+	return wrappedPayload, nil
+}
+
+func (mpcc *MIDIProgramChangeCreate) Type() string {
+	return mpcc.config.Type
+}
+
+func init() {
+	RegisterProcessor(ProcessorRegistration{
+		Type:  "midi.program_change.create",
+		Title: "Create MIDI Prgoram Change Message",
+		ParamsSchema: &jsonschema.Schema{
+			Type: "object",
+			Properties: map[string]*jsonschema.Schema{
+				"channel": {
+					Title: "Channel",
+					Type:  "string",
+				},
+				"program": {
+					Title: "Program",
+					Type:  "string",
+				},
+			},
+			Required:             []string{"type", "channel", "program"},
+			AdditionalProperties: nil,
+		},
+		New: func(config config.ProcessorConfig) (Processor, error) {
+			params := config.Params
+
+			channelString, err := params.GetString("channel")
+			if err != nil {
+				return nil, fmt.Errorf("midi.program_change.create channel error: %w", err)
+			}
+
+			channelTemplate, err := template.New("channel").Parse(channelString)
+
+			if err != nil {
+				return nil, err
+			}
+
+			programString, err := params.GetString("program")
+			if err != nil {
+				return nil, fmt.Errorf("midi.program_change.create program error: %w", err)
+			}
+
+			programTemplate, err := template.New("program").Parse(programString)
+
+			if err != nil {
+				return nil, err
+			}
+			return &MIDIProgramChangeCreate{
+				config:  config,
+				Channel: channelTemplate,
+				Program: programTemplate,
+			}, nil
+		},
+	})
+}