// Parse writes a csv entry for each line in the kernel log file, and returns whether the format was valid.
func Parse(f string) (bool, string, []error) {
var errs []error
var buf bytes.Buffer
csvState := csv.NewState(&buf, false)
activeMap := make(map[string]*entry)
curTime := int64(0)
startTime := int64(0)
matched := false
for _, l := range strings.Split(f, "\n") {
if matches, result := historianutils.SubexpNames(WakeSourceRE, l); matches {
timestamp, err := bugreportutils.TimeStampToMs(result["timeStamp"], result["remainder"], time.UTC)
if err != nil {
errs = append(errs, err)
continue
}
matched = true
if startTime == 0 {
startTime = timestamp
}
curTime = timestamp
t := result["transitionType"]
v := result["value"]
e, alreadyActive := activeMap[v]
switch t {
case PositiveTransition:
if !alreadyActive {
e = &entry{timestamp, v}
activeMap[v] = e
} else {
// Double positive transition. Ignore the event.
errs = append(errs, fmt.Errorf("two positive transitions for %q, wakesource %q", KernelWakeSource, v))
continue
}
case NegativeTransition:
if !alreadyActive {
errs = append(errs, fmt.Errorf("negative transition without positive transition for %q, wakesource %q", KernelWakeSource, v))
continue
}
delete(activeMap, v)
default:
errs = append(errs, fmt.Errorf("unknown transition for %q %q", KernelWakeSource, t))
continue
}
csvState.AddEntry(KernelWakeSource, e, curTime)
}
}
csvState.PrintAllReset(curTime)
return matched, buf.String(), errs
}
// fullTimestamp constructs the unix ms timestamp from the given date and time information.
// Since event log events have no corresponding year, we reconstruct the full timestamp using
// the stored reference year and month extracted from the dumpstate line of the bug report.
func (p *parser) fullTimestamp(month, day, partialTimestamp, remainder string) (int64, error) {
parsedMonth, err := strconv.Atoi(month)
if err != nil {
return 0, err
}
if !validMonth(parsedMonth) {
return 0, fmt.Errorf("invalid month: %d", parsedMonth)
}
year := p.referenceYear
// The reference month and year represents the time the bugreport was taken.
// If the bug report event log begins near the end of a year, and rolls over to the next year,
// the events will be in either the previous year to the reference year or in the reference year.
// Bug reports are assumed to span at most a month, but we leave a slightly larger margin here
// in case we get a slightly longer bug report.
if p.referenceMonth < time.March && time.Month(parsedMonth) > time.October {
year--
// Some events may still occur after the given reference date, so we check for a year rollover.
} else if p.referenceMonth > time.October && time.Month(parsedMonth) < time.March {
year++
}
return bugreportutils.TimeStampToMs(fmt.Sprintf("%d-%s-%s %s", year, month, day, partialTimestamp), remainder, p.loc)
}