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grafana/pkg/services/live/pipeline/frame_processor_keep_field.go

42 lines
1.0 KiB

package pipeline
import (
"context"
"github.com/grafana/grafana-plugin-sdk-go/data"
)
// KeepFieldsFrameProcessor can keep specified fields in a data.Frame dropping all other fields.
type KeepFieldsFrameProcessor struct {
config KeepFieldsFrameProcessorConfig
}
func NewKeepFieldsFrameProcessor(config KeepFieldsFrameProcessorConfig) *KeepFieldsFrameProcessor {
return &KeepFieldsFrameProcessor{config: config}
}
func stringInSlice(str string, slice []string) bool {
for _, s := range slice {
if s == str {
return true
}
}
return false
}
const FrameProcessorTypeKeepFields = "keepFields"
func (p *KeepFieldsFrameProcessor) Type() string {
return FrameProcessorTypeKeepFields
}
func (p *KeepFieldsFrameProcessor) ProcessFrame(_ context.Context, _ Vars, frame *data.Frame) (*data.Frame, error) {
var fieldsToKeep []*data.Field
for _, field := range frame.Fields {
if stringInSlice(field.Name, p.config.FieldNames) {
fieldsToKeep = append(fieldsToKeep, field)
}
}
f := data.NewFrame(frame.Name, fieldsToKeep...)
return f, nil
}