forked from influxdata/influxdb
/
resultset.go
74 lines (60 loc) · 1.56 KB
/
resultset.go
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package reads
import (
"context"
"math"
"github.com/influxdata/influxdb/models"
"github.com/influxdata/influxdb/storage/reads/datatypes"
"github.com/influxdata/influxdb/tsdb/cursors"
)
type multiShardCursors interface {
createCursor(row SeriesRow) cursors.Cursor
newAggregateCursor(ctx context.Context, agg *datatypes.Aggregate, cursor cursors.Cursor) cursors.Cursor
}
type resultSet struct {
ctx context.Context
agg *datatypes.Aggregate
cur SeriesCursor
row SeriesRow
mb multiShardCursors
}
func NewFilteredResultSet(ctx context.Context, req *datatypes.ReadFilterRequest, cur SeriesCursor) ResultSet {
return &resultSet{
ctx: ctx,
cur: cur,
mb: newMultiShardArrayCursors(ctx, req.Range.Start, req.Range.End, true, math.MaxInt64),
}
}
func (r *resultSet) Err() error { return nil }
// Close closes the result set. Close is idempotent.
func (r *resultSet) Close() {
if r == nil {
return // Nothing to do.
}
r.row.Query = nil
r.cur.Close()
}
// Next returns true if there are more results available.
func (r *resultSet) Next() bool {
if r == nil {
return false
}
row := r.cur.Next()
if row == nil {
return false
}
r.row = *row
return true
}
func (r *resultSet) Cursor() cursors.Cursor {
cur := r.mb.createCursor(r.row)
if r.agg != nil {
cur = r.mb.newAggregateCursor(r.ctx, r.agg, cur)
}
return cur
}
func (r *resultSet) Tags() models.Tags {
return r.row.Tags
}
// Stats returns the stats for the underlying cursors.
// Available after resultset has been scanned.
func (r *resultSet) Stats() cursors.CursorStats { return r.row.Query.Stats() }