/
timeutils.go
52 lines (48 loc) · 1.14 KB
/
timeutils.go
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package log5go
import (
"time"
)
// given a time, calculate the instant that the log should next roll
func calculateNextRollTime(t time.Time, freq rollFrequency) time.Time {
if freq == RollMinutely {
t = t.Truncate(time.Minute)
t = t.Add(time.Minute)
} else if freq == RollHourly {
t = t.Truncate(time.Hour)
t = t.Add(time.Hour)
} else {
t = t.Truncate(time.Hour)
// easiest way to beat DST bugs is to just iterate
for t.Hour() > 0 {
t = t.Add(-time.Hour)
}
if freq == RollDaily {
t = t.AddDate(0, 0, 1)
} else {
if t.Weekday() == time.Sunday {
t = t.AddDate(0, 0, 7)
} else {
for t.Weekday() != time.Sunday {
t = t.AddDate(0, 0, 1)
}
}
}
}
return t
}
// find the previous roll time for the given frequency.
// time t is assumed to be truncated to a valid roll time.
func calculatePreviousRollTime(t time.Time, freq rollFrequency) time.Time {
switch freq {
case RollMinutely:
return t.Add(-time.Minute)
case RollHourly:
return t.Add(-time.Hour)
case RollDaily:
return t.AddDate(0, 0, -1)
case RollWeekly:
return t.AddDate(0, 0, -7)
default:
return t.AddDate(0, 0, -1) // shouldn't occur
}
}