rename processing to processor

internal/processor/script-js.go

@@ -0,0 +1,89 @@
+package processor
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+
+	"github.com/jwetzell/showbridge-go/internal/config"
+	"modernc.org/quickjs"
+)
+
+type ScriptJS struct {
+	config  config.ProcessorConfig
+	Program string
+}
+
+func (sj *ScriptJS) Process(ctx context.Context, payload any) (any, error) {
+
+	vm, err := quickjs.NewVM()
+
+	if err != nil {
+		return nil, err
+	}
+	defer vm.Close()
+	payloadAtom, err := vm.NewAtom("payload")
+
+	if err != nil {
+		return nil, err
+	}
+
+	vm.SetProperty(vm.GlobalObject(), payloadAtom, payload)
+
+	_, err = vm.Eval(sj.Program, quickjs.EvalGlobal)
+
+	if err != nil {
+		return nil, err
+	}
+
+	output, err := vm.GetProperty(vm.GlobalObject(), payloadAtom)
+
+	if err != nil {
+		return nil, err
+	}
+
+	// NOTE(jwetzell): turn undefined into nil
+	_, ok := output.(quickjs.Undefined)
+
+	if ok {
+		return nil, nil
+	}
+
+	// NOTE(jwetzell): turn object into map[string]interface{}
+	outputObject, ok := output.(*quickjs.Object)
+
+	if ok {
+		var outputMap map[string]interface{}
+		err := json.Unmarshal([]byte(outputObject.String()), &outputMap)
+		return outputMap, err
+	}
+
+	return output, nil
+}
+
+func (sj *ScriptJS) Type() string {
+	return sj.config.Type
+}
+
+func init() {
+	RegisterProcessor(ProcessorRegistration{
+		Type: "script.js",
+		New: func(config config.ProcessorConfig) (Processor, error) {
+			params := config.Params
+
+			program, ok := params["program"]
+
+			if !ok {
+				return nil, fmt.Errorf("script.js requires a program parameter")
+			}
+
+			programString, ok := program.(string)
+
+			if !ok {
+				return nil, fmt.Errorf("script.js program must be a string")
+			}
+
+			return &ScriptJS{config: config, Program: programString}, nil
+		},
+	})
+}