func whisperCreate(path string) ([]*whisper.TimeSeriesPoint, error) {
ts := make([]*whisper.TimeSeriesPoint, 30)
os.Remove(path) // Don't care if it fails
retentions, err := whisper.ParseRetentionDefs("1m:30m")
if err != nil {
return ts, err
}
wsp, err := whisper.Create(path, retentions, whisper.Sum, 0.5)
if err != nil {
return ts, err
}
defer wsp.Close()
rand.Seed(time.Now().Unix())
for i, _ := range ts {
dur := fmt.Sprintf("-%dm", 29-i)
tdur, _ := time.ParseDuration(dur)
point := new(whisper.TimeSeriesPoint)
point.Value = float64(rand.Intn(100))
point.Time = int(time.Now().Add(tdur).Unix())
ts[i] = point
//log.Printf("WhisperCreate(): point -%dm is %.2f\n", 29-i, point.Value)
}
wsp.UpdateMany(ts)
return ts, nil
}
func whisperCreateNulls(path string) ([]*whisper.TimeSeriesPoint, error) {
ts := make([]*whisper.TimeSeriesPoint, 30)
os.Remove(path) // Don't care if it fails
retentions, err := whisper.ParseRetentionDefs("1m:30m")
if err != nil {
return ts, err
}
wsp, err := whisper.Create(path, retentions, whisper.Sum, 0.5)
if err != nil {
return ts, err
}
defer wsp.Close()
for i, _ := range ts {
tdur, _ := time.ParseDuration(fmt.Sprintf("-%dm", 29-i))
j := rand.Intn(100)
point := new(whisper.TimeSeriesPoint)
if j < 65 {
point.Value = math.NaN()
point.Time = 0
} else {
point.Value = float64(j)
point.Time = int(time.Now().Add(tdur).Unix())
}
ts[i] = point
//log.Printf("WhisperNulls(): point -%dm is %.2f\n", 29-i, point.Value)
if !math.IsNaN(point.Value) {
err = wsp.Update(point.Value, point.Time)
if err != nil {
return ts, err
}
}
}
return ts, nil
}
func fetchFromFile(path string) ([]*whisper.TimeSeriesPoint, error) {
// Init the datastructure we will load values into
tsp := make([]*whisper.TimeSeriesPoint, 30)
for i, _ := range tsp {
point := new(whisper.TimeSeriesPoint)
point.Value = math.NaN()
tsp[i] = point
}
// Try to open the file
wsp, err := whisper.Open(path)
if err != nil {
return tsp, err
}
defer wsp.Close()
// Parse and fetch data from it
ts, err := wsp.Fetch(0, int(time.Now().Unix()))
if err != nil {
return tsp, err
}
return ts.Points(), nil
}