func (p *pgSerDe) fetchRoundRobinArchives(ds *rrd.DataSource) ([]*rrd.RoundRobinArchive, error) {
const sql = `SELECT id, ds_id, cf, steps_per_row, size, width, xff, value, duration_ms, latest FROM %[1]srra rra WHERE ds_id = $1`
rows, err := p.dbConn.Query(fmt.Sprintf(sql, p.prefix), ds.Id())
if err != nil {
log.Printf("fetchRoundRobinArchives(): error querying database: %v", err)
return nil, err
}
defer rows.Close()
var rras []*rrd.RoundRobinArchive
for rows.Next() {
if rra, err := roundRobinArchiveFromRow(rows, ds.Step()); err == nil {
rras = append(rras, rra)
} else {
log.Printf("fetchRoundRobinArchives(): error: %v", err)
return nil, err
}
}
return rras, nil
}
