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package hdrhistogram
import (
"bufio"
"io"
"math"
"regexp"
"strconv"
"strings"
)
type HistogramLogReader struct {
log *bufio.Reader
startTimeSec float64
observedStartTime bool
baseTimeSec float64
observedBaseTime bool
// scanner handling state
absolute bool
rangeStartTimeSec float64
rangeEndTimeSec float64
observedMax bool
rangeObservedMax int64
observedMin bool
rangeObservedMin int64
reStartTime *regexp.Regexp
reBaseTime *regexp.Regexp
reHistogramInterval *regexp.Regexp
}
func (hlr *HistogramLogReader) ObservedMin() bool {
return hlr.observedMin
}
func (hlr *HistogramLogReader) ObservedMax() bool {
return hlr.observedMax
}
// Returns the overall observed max limit ( up to the current point ) of the read histograms
func (hlr *HistogramLogReader) RangeObservedMax() int64 {
return hlr.rangeObservedMax
}
// Returns the overall observed min limit ( up to the current point ) of the read histograms
func (hlr *HistogramLogReader) RangeObservedMin() int64 {
return hlr.rangeObservedMin
}
func NewHistogramLogReader(log io.Reader) *HistogramLogReader {
//# "#[StartTime: %f (seconds since epoch), %s]\n"
reStartTime, _ := regexp.Compile(`#\[StartTime: ([\d\.]*)`)
//# "#[BaseTime: %f (seconds since epoch)]\n"
reBaseTime, _ := regexp.Compile(`#\[BaseTime: ([\d\.]*)`)
//# 0.127,1.007,2.769,HISTFAAAAEV42pNpmSz...
//# Tag=A,0.127,1.007,2.769,HISTFAAAAEV42pNpmSz
//# "%f,%f,%f,%s\n"
reHistogramInterval, _ := regexp.Compile(`([\d\.]*),([\d\.]*),([\d\.]*),(.*)`)
//
reader := bufio.NewReader(log)
return &HistogramLogReader{log: reader,
startTimeSec: 0.0,
observedStartTime: false,
baseTimeSec: 0.0,
observedBaseTime: false,
reStartTime: reStartTime,
reBaseTime: reBaseTime,
reHistogramInterval: reHistogramInterval,
rangeObservedMin: math.MaxInt64,
observedMin: false,
rangeObservedMax: math.MinInt64,
observedMax: false,
}
}
func (hlr *HistogramLogReader) NextIntervalHistogram() (histogram *Histogram, err error) {
return hlr.NextIntervalHistogramWithRange(0.0, math.MaxFloat64, true)
}
func (hlr *HistogramLogReader) NextIntervalHistogramWithRange(rangeStartTimeSec, rangeEndTimeSec float64, absolute bool) (histogram *Histogram, err error) {
hlr.rangeStartTimeSec = rangeStartTimeSec
hlr.rangeEndTimeSec = rangeEndTimeSec
hlr.absolute = absolute
return hlr.decodeNextIntervalHistogram()
}
func (hlr *HistogramLogReader) decodeNextIntervalHistogram() (histogram *Histogram, err error) {
var line string
var tag string = ""
var logTimeStampInSec float64
var intervalLengthSec float64
for {
line, err = hlr.log.ReadString('\n')
if err != nil {
if err == io.EOF {
err = nil
break
}
break
}
if line[0] == '#' {
matchRes := hlr.reStartTime.FindStringSubmatch(line)
if len(matchRes) > 0 {
hlr.startTimeSec, err = strconv.ParseFloat(matchRes[1], 64)
if err != nil {
return
}
hlr.observedStartTime = true
continue
}
matchRes = hlr.reBaseTime.FindStringSubmatch(line)
if len(matchRes) > 0 {
hlr.baseTimeSec, err = strconv.ParseFloat(matchRes[1], 64)
if err != nil {
return
}
hlr.observedBaseTime = true
continue
}
continue
}
if strings.HasPrefix(line, "Tag=") {
commaPos := strings.Index(line, ",")
tag = line[4:commaPos]
line = line[commaPos+1:]
}
matchRes := hlr.reHistogramInterval.FindStringSubmatch(line)
if len(matchRes) >= 1 {
// Decode: startTimestamp, intervalLength, maxTime, histogramPayload
// Timestamp is expected to be in seconds
logTimeStampInSec, err = strconv.ParseFloat(matchRes[1], 64)
if err != nil {
return
}
intervalLengthSec, err = strconv.ParseFloat(matchRes[2], 64)
if err != nil {
return
}
cpayload := matchRes[4]
// No explicit start time noted. Use 1st observed time:
if !hlr.observedStartTime {
hlr.startTimeSec = logTimeStampInSec
hlr.observedStartTime = true
}
// No explicit base time noted.
// Deduce from 1st observed time (compared to start time):
if !hlr.observedBaseTime {
// Criteria Note: if log timestamp is more than a year in
// the past (compared to StartTime),
// we assume that timestamps in the log are not absolute
if logTimeStampInSec < (hlr.startTimeSec - (365 * 24 * 3600.0)) {
hlr.baseTimeSec = hlr.startTimeSec
} else {
hlr.baseTimeSec = 0.0
}
hlr.observedBaseTime = true
}
absoluteStartTimeStampSec := logTimeStampInSec + hlr.baseTimeSec
offsetStartTimeStampSec := absoluteStartTimeStampSec + hlr.startTimeSec
// Timestamp length is expect to be in seconds
absoluteEndTimeStampSec := absoluteStartTimeStampSec + intervalLengthSec
var startTimeStampToCheckRangeOn float64
if hlr.absolute {
startTimeStampToCheckRangeOn = absoluteStartTimeStampSec
} else {
startTimeStampToCheckRangeOn = offsetStartTimeStampSec
}
if startTimeStampToCheckRangeOn < hlr.rangeStartTimeSec {
continue
}
if startTimeStampToCheckRangeOn > hlr.rangeEndTimeSec {
return
}
histogram, err = Decode([]byte(cpayload))
if err != nil {
return
}
if histogram.Max() > hlr.rangeObservedMax {
hlr.rangeObservedMax = histogram.Max()
}
if histogram.Min() < hlr.rangeObservedMin {
hlr.rangeObservedMin = histogram.Min()
}
histogram.SetStartTimeMs(int64(absoluteStartTimeStampSec * 1000.0))
histogram.SetEndTimeMs(int64(absoluteEndTimeStampSec * 1000.0))
if tag != "" {
histogram.SetTag(tag)
}
return
}
}
return
}
|
