func prepareInstantQuery(node Node, timestamp clientmodel.Timestamp, storage local.Storage, queryStats *stats.TimerGroup) (local.Preloader, error) {
analyzeTimer := queryStats.GetTimer(stats.QueryAnalysisTime).Start()
analyzer := NewQueryAnalyzer(storage)
Walk(analyzer, node)
analyzeTimer.Stop()
// TODO: Preloading should time out after a given duration.
preloadTimer := queryStats.GetTimer(stats.PreloadTime).Start()
p := storage.NewPreloader()
for fp, rangeDuration := range analyzer.FullRanges {
if err := p.PreloadRange(fp, timestamp.Add(-rangeDuration), timestamp, *stalenessDelta); err != nil {
p.Close()
return nil, err
}
}
for fp := range analyzer.IntervalRanges {
if err := p.PreloadRange(fp, timestamp, timestamp, *stalenessDelta); err != nil {
p.Close()
return nil, err
}
}
preloadTimer.Stop()
ii := &iteratorInitializer{
storage: storage,
}
Walk(ii, node)
return p, nil
}
func prepareRangeQuery(node Node, start clientmodel.Timestamp, end clientmodel.Timestamp, interval time.Duration, storage local.Storage, queryStats *stats.TimerGroup) (local.Preloader, error) {
analyzeTimer := queryStats.GetTimer(stats.QueryAnalysisTime).Start()
analyzer := NewQueryAnalyzer(storage)
Walk(analyzer, node)
analyzeTimer.Stop()
// TODO: Preloading should time out after a given duration.
preloadTimer := queryStats.GetTimer(stats.PreloadTime).Start()
p := storage.NewPreloader()
for fp, rangeDuration := range analyzer.FullRanges {
if err := p.PreloadRange(fp, start.Add(-rangeDuration), end, *stalenessDelta); err != nil {
p.Close()
return nil, err
}
/*
if interval < rangeDuration {
if err := p.GetMetricRange(fp, end, end.Sub(start)+rangeDuration); err != nil {
p.Close()
return nil, err
}
} else {
if err := p.GetMetricRangeAtInterval(fp, start, end, interval, rangeDuration); err != nil {
p.Close()
return nil, err
}
}
*/
}
for fp := range analyzer.IntervalRanges {
if err := p.PreloadRange(fp, start, end, *stalenessDelta); err != nil {
p.Close()
return nil, err
}
}
preloadTimer.Stop()
ii := &iteratorInitializer{
storage: storage,
}
Walk(ii, node)
return p, nil
}
