Live: array for Processor, Outputter and Subscriber in channel rule top level (#39677)

pkg/services/live/pipeline/frame_processor_drop_field.go

@@ -0,0 +1,43 @@
+package pipeline
+
+import (
+	"context"
+
+	"github.com/grafana/grafana-plugin-sdk-go/data"
+)
+
+type DropFieldsFrameProcessorConfig struct {
+	FieldNames []string `json:"fieldNames"`
+}
+
+// DropFieldsFrameProcessor can drop specified fields from a data.Frame.
+type DropFieldsFrameProcessor struct {
+	config DropFieldsFrameProcessorConfig
+}
+
+func removeIndex(s []*data.Field, index int) []*data.Field {
+	return append(s[:index], s[index+1:]...)
+}
+
+func NewDropFieldsFrameProcessor(config DropFieldsFrameProcessorConfig) *DropFieldsFrameProcessor {
+	return &DropFieldsFrameProcessor{config: config}
+}
+
+const FrameProcessorTypeDropFields = "dropFields"
+
+func (p *DropFieldsFrameProcessor) Type() string {
+	return FrameProcessorTypeDropFields
+}
+
+func (p *DropFieldsFrameProcessor) ProcessFrame(_ context.Context, _ Vars, frame *data.Frame) (*data.Frame, error) {
+	for _, f := range p.config.FieldNames {
+	inner:
+		for i, field := range frame.Fields {
+			if f == field.Name {
+				frame.Fields = removeIndex(frame.Fields, i)
+				continue inner
+			}
+		}
+	}
+	return frame, nil
+}