Fix edge cases in data extraction for point and interval ops.

This commit is contained in:
Julius Volz 2013-03-16 01:29:21 -07:00 committed by Matt T. Proud
parent a4361e4116
commit e0dbc8c561
1 changed files with 16 additions and 6 deletions

View File

@ -104,13 +104,23 @@ func extractValuesAroundTime(t time.Time, in []model.SamplePair) (out []model.Sa
i := sort.Search(len(in), func(i int) bool {
return !in[i].Timestamp.Before(t)
})
switch i {
case len(in):
if i == len(in) {
// Target time is past the end, return only the last sample.
out = in[len(in)-1:]
case 0:
out = append(out, in[0:1]...)
default:
out = append(out, in[i-1:i+1]...)
} else {
if in[i].Timestamp.Equal(t) && len(in) > i+1 {
// We hit exactly the current sample time. Very unlikely in practice.
// Return only the current sample.
out = append(out, in[i])
} else {
if i == 0 {
// We hit before the first sample time. Return only the first sample.
out = append(out, in[0:1]...)
} else {
// We hit between two samples. Return both surrounding samples.
out = append(out, in[i-1:i+1]...)
}
}
}
return
}