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elapsed.go
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elapsed.go
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package universe
import (
"time"
"github.com/influxdata/flux"
"github.com/influxdata/flux/codes"
"github.com/influxdata/flux/execute"
"github.com/influxdata/flux/internal/errors"
"github.com/influxdata/flux/plan"
"github.com/influxdata/flux/runtime"
"github.com/influxdata/flux/values"
)
const ElapsedKind = "elapsed"
type ElapsedOpSpec struct {
Unit flux.Duration `json:"unit"`
TimeColumn string `json:"timeColumn"`
ColumnName string `json:"columnName"`
}
func init() {
elapsedSignature := runtime.MustLookupBuiltinType("universe", "elapsed")
runtime.RegisterPackageValue("universe", ElapsedKind, flux.MustValue(flux.FunctionValue(ElapsedKind, createElapsedOpSpec, elapsedSignature)))
plan.RegisterProcedureSpec(ElapsedKind, newElapsedProcedure, ElapsedKind)
execute.RegisterTransformation(ElapsedKind, createElapsedTransformation)
}
func createElapsedOpSpec(args flux.Arguments, a *flux.Administration) (flux.OperationSpec, error) {
if err := a.AddParentFromArgs(args); err != nil {
return nil, err
}
spec := new(ElapsedOpSpec)
if unit, ok, err := args.GetDuration("unit"); err != nil {
return nil, err
} else if ok {
spec.Unit = unit
} else {
spec.Unit = flux.ConvertDuration(time.Second)
}
if timeCol, ok, err := args.GetString("timeColumn"); err != nil {
return nil, err
} else if ok {
spec.TimeColumn = timeCol
} else {
spec.TimeColumn = execute.DefaultTimeColLabel
}
if name, ok, err := args.GetString("columnName"); err != nil {
return nil, err
} else if ok {
spec.ColumnName = name
} else {
spec.ColumnName = "elapsed"
}
return spec, nil
}
func (s *ElapsedOpSpec) Kind() flux.OperationKind {
return ElapsedKind
}
type ElapsedProcedureSpec struct {
plan.DefaultCost
Unit flux.Duration `json:"unit"`
TimeColumn string `json:"timeColumn"`
ColumnName string `json:"columnName"`
}
func newElapsedProcedure(qs flux.OperationSpec, pa plan.Administration) (plan.ProcedureSpec, error) {
spec, ok := qs.(*ElapsedOpSpec)
if !ok {
return nil, errors.Newf(codes.Internal, "invalid spec type %T", qs)
}
return &ElapsedProcedureSpec{
Unit: spec.Unit,
TimeColumn: spec.TimeColumn,
ColumnName: spec.ColumnName,
}, nil
}
func (s *ElapsedProcedureSpec) Kind() plan.ProcedureKind {
return ElapsedKind
}
func (s *ElapsedProcedureSpec) Copy() plan.ProcedureSpec {
return &ElapsedProcedureSpec{
Unit: s.Unit,
TimeColumn: s.TimeColumn,
ColumnName: s.ColumnName,
}
}
func createElapsedTransformation(id execute.DatasetID, mode execute.AccumulationMode, spec plan.ProcedureSpec, a execute.Administration) (execute.Transformation, execute.Dataset, error) {
s, ok := spec.(*ElapsedProcedureSpec)
if !ok {
return nil, nil, errors.Newf(codes.Internal, "invalid spec type %T", spec)
}
cache := execute.NewTableBuilderCache(a.Allocator())
d := execute.NewDataset(id, mode, cache)
t := NewElapsedTransformation(d, cache, s)
return t, d, nil
}
type elapsedTransformation struct {
execute.ExecutionNode
d execute.Dataset
cache execute.TableBuilderCache
unit float64
timeColumn string
columnName string
}
func NewElapsedTransformation(d execute.Dataset, cache execute.TableBuilderCache, spec *ElapsedProcedureSpec) *elapsedTransformation {
return &elapsedTransformation{
d: d,
cache: cache,
unit: float64(values.Duration(spec.Unit).Duration()),
timeColumn: spec.TimeColumn,
columnName: spec.ColumnName,
}
}
func (t *elapsedTransformation) RetractTable(id execute.DatasetID, key flux.GroupKey) error {
return t.d.RetractTable(key)
}
func (t *elapsedTransformation) UpdateWatermark(id execute.DatasetID, mark execute.Time) error {
return t.d.UpdateWatermark(mark)
}
func (t *elapsedTransformation) UpdateProcessingTime(id execute.DatasetID, pt execute.Time) error {
return t.d.UpdateProcessingTime(pt)
}
func (t *elapsedTransformation) Finish(id execute.DatasetID, err error) {
t.d.Finish(err)
}
func (t *elapsedTransformation) Process(id execute.DatasetID, tbl flux.Table) error {
builder, created := t.cache.TableBuilder(tbl.Key())
if !created {
return errors.Newf(codes.FailedPrecondition, "found duplicate table with key: %v", tbl.Key())
}
cols := tbl.Cols()
numCol := 0
err := execute.AddTableCols(tbl, builder)
if err != nil {
return err
}
timeIdx := execute.ColIdx(t.timeColumn, cols)
if timeIdx < 0 {
return errors.Newf(codes.FailedPrecondition, "column %q does not exist", t.timeColumn)
}
timeCol := cols[timeIdx]
if timeCol.Type == flux.TTime {
if numCol, err = builder.AddCol(flux.ColMeta{
Label: t.columnName,
Type: flux.TInt,
}); err != nil {
return err
}
}
prevTime, first := float64(0), true
colMap := execute.ColMap([]int{0}, builder, tbl.Cols())
return tbl.Do(func(cr flux.ColReader) error {
l := cr.Len()
if l != 0 {
for j, c := range cols {
if c.Type == flux.TTime && c.Label == t.timeColumn {
ts := cr.Times(j)
i := 0
if first {
prevTime = float64(execute.Time(ts.Value(0)))
i, first = 1, false
}
for ; i < l; i++ {
if err := execute.AppendMappedRecordExplicit(i, cr, builder, colMap); err != nil {
return err
}
pTime := execute.Time(ts.Value(i))
currTime := float64(pTime)
if err := builder.AppendInt(numCol, int64((currTime-prevTime)/t.unit)); err != nil {
return err
}
prevTime = currTime
}
}
}
}
return nil
})
}