new example: ttop (termui top)

This commit is contained in:
marigs 2015-06-16 22:39:24 +02:00
parent 52789d8258
commit c377a74461

366
example/ttop.go Normal file
View File

@ -0,0 +1,366 @@
package main
import (
"fmt"
"bufio"
"os"
"io"
"regexp"
"strings"
"sort"
"strconv"
"time"
"errors"
"runtime"
"github.com/marigs/termui"
)
const statFilePath = "/proc/stat"
const meminfoFilePath = "/proc/meminfo"
type CpuStat struct {
user float32
nice float32
system float32
idle float32
}
type CpusStats struct {
stat map[string]CpuStat
proc map[string]CpuStat
}
func NewCpusStats(s map[string]CpuStat) *CpusStats {
return &CpusStats{stat: s, proc: make(map[string]CpuStat)}
}
func (cs *CpusStats) String() (ret string) {
for key, _ := range cs.proc {
ret += fmt.Sprintf("%s: %.2f %.2f %.2f %.2f\n", key, cs.proc[key].user, cs.proc[key].nice, cs.proc[key].system, cs.proc[key].idle)
}
return
}
func subCpuStat(m CpuStat, s CpuStat) CpuStat {
return CpuStat{user: m.user - s.user,
nice: m.nice - s.nice,
system: m.system - s.system,
idle: m.idle - s.idle}
}
func procCpuStat(c CpuStat) CpuStat {
sum := c.user + c.nice + c.system + c.idle
return CpuStat{user: c.user/sum*100,
nice: c.nice/sum*100,
system: c.system/sum*100,
idle: c.idle/sum*100}
}
func (cs *CpusStats) tick(ns map[string]CpuStat) {
for key, _ := range cs.stat {
proc := subCpuStat(ns[key], cs.stat[key])
cs.proc[key] = procCpuStat(proc)
cs.stat[key] = ns[key]
}
}
type errIntParser struct {
err error
}
func (eip *errIntParser) parse(s string) (ret int64) {
if eip.err != nil {
return 0
}
ret, eip.err = strconv.ParseInt(s, 10, 0)
return
}
type LineProcessor interface {
process(string) error
finalize() interface {}
}
type CpuLineProcessor struct {
m map[string]CpuStat
}
func (clp *CpuLineProcessor) process(line string) (err error) {
r := regexp.MustCompile("^cpu([0-9]*)")
if r.MatchString(line) {
tab := strings.Fields(line)
if len(tab) < 5 {
err = errors.New("cpu info line has not enough fields")
return
}
parser := errIntParser{}
cs := CpuStat{user: float32(parser.parse(tab[1])),
nice: float32(parser.parse(tab[2])),
system: float32(parser.parse(tab[3])),
idle: float32(parser.parse(tab[4]))}
clp.m[tab[0]] = cs
err = parser.err
if err != nil {
return
}
}
return
}
func (clp *CpuLineProcessor) finalize() interface {} {
return clp.m
}
type MemStat struct {
total int64
free int64
}
func (ms MemStat) String() (ret string) {
ret = fmt.Sprintf("TotalMem: %d, FreeMem: %d\n", ms.total, ms.free)
return
}
func (ms *MemStat) process(line string) (err error) {
rtotal := regexp.MustCompile("^MemTotal:")
rfree := regexp.MustCompile("^MemFree:")
var aux int64
if rtotal.MatchString(line) || rfree.MatchString(line) {
tab := strings.Fields(line)
if len(tab) < 3 {
err = errors.New("mem info line has not enough fields")
return
}
aux, err = strconv.ParseInt(tab[1], 10, 0)
}
if err != nil {
return
}
if rtotal.MatchString(line) {
ms.total = aux
}
if rfree.MatchString(line) {
ms.free = aux
}
return
}
func (ms *MemStat) finalize() interface {} {
return *ms
}
func processFileLines(filePath string, lp LineProcessor) (ret interface {}, err error) {
var statFile *os.File
statFile, err = os.Open(filePath)
if err != nil {
fmt.Printf("open: %v\n", err)
}
defer statFile.Close()
statFileReader := bufio.NewReader(statFile)
for {
var line string
line, err = statFileReader.ReadString('\n')
if err == io.EOF {
err = nil
break
}
if err != nil {
fmt.Printf("open: %v\n", err)
break
}
line = strings.TrimSpace(line)
err = lp.process(line)
}
ret = lp.finalize()
return
}
func getCpusStatsMap() (m map[string]CpuStat, err error) {
var aux interface {}
aux, err = processFileLines(statFilePath, &CpuLineProcessor{m: make(map[string]CpuStat)})
return aux.(map[string]CpuStat), err
}
func getMemStats() (ms MemStat, err error) {
var aux interface {}
aux, err = processFileLines(meminfoFilePath, &MemStat{})
return aux.(MemStat), err
}
type CpuTabElems struct {
GMap map[string]*termui.Gauge
LChart *termui.LineChart
}
func NewCpuTabElems(width int) *CpuTabElems {
lc := termui.NewLineChart()
lc.Width = width
lc.Height = 12
lc.X = 0
lc.Mode = "dot"
lc.Border.Label = "CPU"
return &CpuTabElems{GMap: make(map[string]*termui.Gauge),
LChart: lc}
}
func (cte *CpuTabElems) AddGauge(key string, Y int, width int) *termui.Gauge {
cte.GMap[key] = termui.NewGauge()
cte.GMap[key].Width = width
cte.GMap[key].Height = 3
cte.GMap[key].Y = Y
cte.GMap[key].Border.Label = key
cte.GMap[key].Percent = 0//int(val.user + val.nice + val.system)
return cte.GMap[key]
}
func (cte *CpuTabElems) Update(cs CpusStats) {
for key, val := range cs.proc {
p := int(val.user + val.nice + val.system)
cte.GMap[key].Percent = p
if key == "cpu" {
cte.LChart.Data = append(cte.LChart.Data, 0)
copy(cte.LChart.Data[1:], cte.LChart.Data[0:])
cte.LChart.Data[0] = float64(p)
}
}
}
type MemTabElems struct {
Gauge *termui.Gauge
SLines *termui.Sparklines
}
func NewMemTabElems(width int) *MemTabElems {
g := termui.NewGauge()
g.Width = width
g.Height = 3
g.Y = 0
sline := termui.NewSparkline()
sline.Title = "MEM"
sline.Height = 8
sls := termui.NewSparklines(sline)
sls.Width = width
sls.Height = 12
sls.Y = 3
return &MemTabElems{Gauge: g, SLines: sls}
}
func (mte *MemTabElems) Update(ms MemStat) {
used := int((ms.total - ms.free) * 100 / ms.total)
mte.Gauge.Percent = used
mte.SLines.Lines[0].Data = append(mte.SLines.Lines[0].Data, 0)
copy(mte.SLines.Lines[0].Data[1:], mte.SLines.Lines[0].Data[0:])
mte.SLines.Lines[0].Data[0] = used
if len(mte.SLines.Lines[0].Data) > mte.SLines.Width-2 {
mte.SLines.Lines[0].Data = mte.SLines.Lines[0].Data[0:mte.SLines.Width-2]
}
}
func main() {
if runtime.GOOS != "linux" {
panic("Currently works only on Linux")
}
err := termui.Init()
if err != nil {
panic(err)
}
defer termui.Close()
termWidth := 70
termui.UseTheme("helloworld")
header := termui.NewPar("Press q to quit, Press j or k to switch tabs")
header.Height = 1
header.Width = 50
header.HasBorder = false
header.TextBgColor = termui.ColorBlue
tabCpu := termui.NewTab("CPU")
tabMem := termui.NewTab("MEM")
tabpane := termui.NewTabpane()
tabpane.Y = 1
tabpane.Width = 30
tabpane.HasBorder = false
cs, errcs := getCpusStatsMap()
cpusStats := NewCpusStats(cs)
if errcs != nil {
panic("error")
}
cpuTabElems := NewCpuTabElems(termWidth)
Y := 0
cpuKeys := make([]string, 0, len(cs))
for key := range cs {
cpuKeys = append(cpuKeys, key)
}
sort.Strings(cpuKeys)
for _, key := range cpuKeys {
g := cpuTabElems.AddGauge(key, Y, termWidth)
Y += 3
tabCpu.AddBlocks(g)
}
cpuTabElems.LChart.Y = Y
tabCpu.AddBlocks(cpuTabElems.LChart)
memTabElems := NewMemTabElems(termWidth)
ms, errm := getMemStats()
if errm != nil {
panic(errm)
}
memTabElems.Update(ms)
tabMem.AddBlocks(memTabElems.Gauge)
tabMem.AddBlocks(memTabElems.SLines)
tabpane.SetTabs(*tabCpu, *tabMem)
termui.Render(header, tabpane)
evt := termui.EventCh()
for {
select {
case e := <-evt:
if e.Type == termui.EventKey {
switch e.Ch {
case 'q':
return
case 'j':
tabpane.SetActiveLeft()
termui.Render(header, tabpane)
case 'k':
tabpane.SetActiveRight()
termui.Render(header, tabpane)
}
}
case <-time.After(time.Second):
cs, errcs := getCpusStatsMap()
if errcs != nil {
panic(errcs)
}
cpusStats.tick(cs)
cpuTabElems.Update(*cpusStats)
ms, errm := getMemStats()
if errm != nil {
panic(errm)
}
memTabElems.Update(ms)
termui.Render(header, tabpane)
}
}
}