move expr and js to different namespace

internal/processing/program-js.go

@@ -0,0 +1,64 @@
+package processing
+
+import (
+	"context"
+	"fmt"
+
+	"modernc.org/quickjs"
+)
+
+type ProgramJS struct {
+	config  ProcessorConfig
+	Program string
+}
+
+func (pj *ProgramJS) 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)
+
+	output, err := vm.Eval(pj.Program, quickjs.EvalGlobal)
+	if err != nil {
+		return nil, err
+	}
+
+	return output, nil
+}
+
+func (pj *ProgramJS) Type() string {
+	return pj.config.Type
+}
+
+func init() {
+	RegisterProcessor(ProcessorRegistration{
+		Type: "program.js",
+		New: func(config ProcessorConfig) (Processor, error) {
+			params := config.Params
+
+			program, ok := params["program"]
+
+			if !ok {
+				return nil, fmt.Errorf("program.js requires a program parameter")
+			}
+
+			programString, ok := program.(string)
+
+			if !ok {
+				return nil, fmt.Errorf("program.js program must be a string")
+			}
+
+			return &ProgramJS{config: config, Program: programString}, nil
+		},
+	})
+}