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

pkg/services/live/pipeline/frame_output_multiple.go

@@ -0,0 +1,36 @@
+package pipeline
+
+import (
+	"context"
+
+	"github.com/grafana/grafana-plugin-sdk-go/data"
+)
+
+// MultipleFrameOutput can combine several FrameOutputter and
+// execute them sequentially.
+type MultipleFrameOutput struct {
+	Outputters []FrameOutputter
+}
+
+const FrameOutputTypeMultiple = "multiple"
+
+func (out *MultipleFrameOutput) Type() string {
+	return FrameOutputTypeMultiple
+}
+
+func (out MultipleFrameOutput) OutputFrame(ctx context.Context, vars Vars, frame *data.Frame) ([]*ChannelFrame, error) {
+	var frames []*ChannelFrame
+	for _, out := range out.Outputters {
+		f, err := out.OutputFrame(ctx, vars, frame)
+		if err != nil {
+			logger.Error("Error outputting frame", "error", err)
+			return nil, err
+		}
+		frames = append(frames, f...)
+	}
+	return frames, nil
+}
+
+func NewMultipleFrameOutput(outputters ...FrameOutputter) *MultipleFrameOutput {
+	return &MultipleFrameOutput{Outputters: outputters}
+}