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grafana/pkg/services/live/pipeline/frame_condition_number_comp...

57 lines
1.5 KiB

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}
}