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

pkg/services/live/pipeline/frame_condition_number_compare.go

@@ -0,0 +1,57 @@
+package pipeline
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/grafana/grafana-plugin-sdk-go/data"
+)
+
+// FrameNumberCompareCondition can compare numbers.
+type FrameNumberCompareCondition struct {
+	FieldName string
+	Op        NumberCompareOp
+	Value     float64
+}
+
+const FrameConditionCheckerTypeNumberCompare = "numberCompare"
+
+func (c *FrameNumberCompareCondition) Type() string {
+	return FrameConditionCheckerTypeNumberCompare
+}
+
+func (c *FrameNumberCompareCondition) CheckFrameCondition(_ context.Context, frame *data.Frame) (bool, error) {
+	for _, field := range frame.Fields {
+		// TODO: support other numeric types.
+		if field.Name == c.FieldName && (field.Type() == data.FieldTypeNullableFloat64) {
+			value, ok := field.At(0).(*float64)
+			if !ok {
+				return false, fmt.Errorf("unexpected value type: %T", field.At(0))
+			}
+			if value == nil {
+				return false, nil
+			}
+			switch c.Op {
+			case NumberCompareOpGt:
+				return *value > c.Value, nil
+			case NumberCompareOpGte:
+				return *value >= c.Value, nil
+			case NumberCompareOpLte:
+				return *value <= c.Value, nil
+			case NumberCompareOpLt:
+				return *value < c.Value, nil
+			case NumberCompareOpEq:
+				return *value == c.Value, nil
+			case NumberCompareOpNe:
+				return *value != c.Value, nil
+			default:
+				return false, fmt.Errorf("unknown comparison operator: %s", c.Op)
+			}
+		}
+	}
+	return false, nil
+}
+
+func NewFrameNumberCompareCondition(fieldName string, op NumberCompareOp, value float64) *FrameNumberCompareCondition {
+	return &FrameNumberCompareCondition{FieldName: fieldName, Op: op, Value: value}
+}