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

pkg/services/live/pipeline/frame_output_conditional.go

@@ -0,0 +1,33 @@
+package pipeline
+
+import (
+	"context"
+
+	"github.com/grafana/grafana-plugin-sdk-go/data"
+)
+
+type ConditionalOutput struct {
+	Condition FrameConditionChecker
+	Outputter FrameOutputter
+}
+
+func NewConditionalOutput(condition FrameConditionChecker, outputter FrameOutputter) *ConditionalOutput {
+	return &ConditionalOutput{Condition: condition, Outputter: outputter}
+}
+
+const FrameOutputTypeConditional = "conditional"
+
+func (out *ConditionalOutput) Type() string {
+	return FrameOutputTypeConditional
+}
+
+func (out ConditionalOutput) OutputFrame(ctx context.Context, vars Vars, frame *data.Frame) ([]*ChannelFrame, error) {
+	ok, err := out.Condition.CheckFrameCondition(ctx, frame)
+	if err != nil {
+		return nil, err
+	}
+	if !ok {
+		return nil, nil
+	}
+	return out.Outputter.OutputFrame(ctx, vars, frame)
+}