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datalog_mem.go
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datalog_mem.go
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package main
import (
"bufio"
"fmt"
"os"
"strconv"
"strings"
"time"
)
// DataLogLine holds information about a single log line
type DataLogLine struct {
Time time.Time
EventName string
NativePath string
Data map[string]string
}
// DataLogMem store a full DataLog in memory
type DataLogMem struct {
Filename string
Lines []DataLogLine
}
// HasData returns true if it's a data line with "name" field
func (line *DataLogLine) HasData(name string) bool {
if line.EventName != data {
return false
}
_, exists := line.Data[name]
return exists
}
// GetDataState is an simple helper to get state
func (line *DataLogLine) GetDataState() int {
val, _ := strconv.ParseInt(line.Data[state], 10, 32)
return int(val)
}
// GetDataPercentage is an simple helper to get percentage
func (line *DataLogLine) GetDataPercentage() float64 {
val, _ := strconv.ParseFloat(line.Data[percentage], 64)
return val
}
// GetDataRate is an simple helper to get rate
func (line *DataLogLine) GetDataRate() float64 {
val, _ := strconv.ParseFloat(line.Data[rate], 64)
return val
}
// GetDataTte is an simple helper to get timeToEmpty
func (line *DataLogLine) GetDataTte() string {
val, _ := line.Data[timeToEmpty]
return val
}
// GetDataTtf is an simple helper to get timeToFull
func (line *DataLogLine) GetDataTtf() string {
val, _ := line.Data[timeToFull]
return val
}
// DataLogMemNew will parse filename to create a new DataLogMem
func DataLogMemNew(filename string) (*DataLogMem, error) {
var dlm DataLogMem
dlm.Filename = filename
fd, err := os.Open(filename)
if err != nil {
return nil, err
}
defer fd.Close()
scanner := bufio.NewScanner(fd)
for scanner.Scan() {
var line DataLogLine
fields := strings.Split(scanner.Text(), ";")
time, err := time.Parse(time.RFC3339, fields[0])
if err != nil {
return nil, fmt.Errorf("can't parse date for line: %s", scanner.Text())
}
line.Time = time
line.EventName = fields[1]
switch line.EventName {
case "data":
line.NativePath = fields[2]
line.Data = make(map[string]string)
dataArray := strings.Split(fields[3], ",")
for _, dataField := range dataArray {
keyVal := strings.Split(dataField, "=")
line.Data[keyVal[0]] = keyVal[1]
}
case "start":
case "stop":
case "sleep":
case "resume":
case "online":
case "offline":
default:
fmt.Fprintf(os.Stderr, "WARN: unknown event '%s' in %s\n", line.EventName, filename)
continue
}
dlm.Lines = append(dlm.Lines, line)
}
if err := scanner.Err(); err != nil {
return nil, err
}
return &dlm, nil
}
// FindClosestData returns the closest DataLogLine to referenceLine with dataName field for battery
func (dlm *DataLogMem) FindClosestData(dataName string, referenceLine int, battery string, maxBefore time.Duration, maxAfter time.Duration) *DataLogLine {
var candidateBefore *DataLogLine
var candidateAfter *DataLogLine
// start backward (--)
for i := referenceLine; i >= 0; i-- {
if dlm.Lines[referenceLine].Time.Sub(dlm.Lines[i].Time) > maxBefore {
break
}
if dlm.Lines[i].NativePath == battery && dlm.Lines[i].HasData(dataName) {
candidateBefore = &dlm.Lines[i]
break
}
}
// and then forward (++)
for i := referenceLine; i < len(dlm.Lines); i++ {
if dlm.Lines[i].Time.Sub(dlm.Lines[referenceLine].Time) > maxAfter {
break
}
if dlm.Lines[i].NativePath == battery && dlm.Lines[i].HasData(dataName) {
candidateAfter = &dlm.Lines[i]
break
}
}
if candidateBefore == nil && candidateAfter == nil {
return nil
}
if candidateAfter == nil {
return candidateBefore
}
if candidateBefore == nil {
return candidateAfter
}
diffBefore := dlm.Lines[referenceLine].Time.Sub(candidateBefore.Time)
diffAfter := candidateAfter.Time.Sub(dlm.Lines[referenceLine].Time)
if diffBefore < diffAfter {
return candidateBefore
}
return candidateAfter
}