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// gstat (C) 2015 Paul Buetow (gstat@dev.buetow.org)
package main
import (
"container/list"
"errors"
"flag"
"fmt"
"github.com/buetow/gstat/diskstats"
"github.com/buetow/gstat/process"
"github.com/buetow/gstat/utils"
"golang.org/x/crypto/ssh/terminal"
"log"
"os"
"os/signal"
"syscall"
"time"
)
var config struct {
banner string
interval time.Duration
binary *bool
mode *int
modeName string
}
type twoP struct {
first, second process.Process
diff, diffR, diffW int
}
type mapP map[string]twoP
func timedGather(tChan <-chan bool, dRxChan chan<- diskstats.Diskstats, pRxChan chan<- process.Process) {
for {
switch <-tChan {
case false:
{
break
}
case true:
{
go diskstats.Gather(dRxChan)
go process.Gather(pRxChan)
}
}
}
close(dRxChan)
close(pRxChan)
}
func receiveD(dRxChan <-chan diskstats.Diskstats) {
for d := range dRxChan {
//diskstats.Print()
// Implemented later
_ = d
}
}
func sortP(lastP *mapP) *list.List {
remove := list.New()
sorted := list.New()
for _, val := range *lastP {
nowTimestamp := int32(time.Now().Unix())
if val.first.Timestamp+2 < nowTimestamp {
// Schedule remove obsolete pids from lastP
remove.PushBack(val.first.Id)
} else if val.diff > 0 {
// Insertion sort
if sorted.Len() > 0 {
for e := sorted.Front(); e != nil; e = e.Next() {
diff := e.Value.(twoP).diff
if diff < val.diff {
//fmt.Printf("Inserting %d before %d\n", val.diff, diff)
sorted.InsertBefore(val, e)
break
}
}
} else {
sorted.PushFront(val)
}
}
}
// Rremove obsolete pids from lastP
for e := remove.Front(); e != nil; e = e.Next() {
id := e.Value.(string)
//fmt.Println("Removing stale process: " + id)
delete(*lastP, id)
}
return sorted
}
func printP(sortedP *list.List) {
tWidth, tHeight, err := terminal.GetSize(0)
if err != nil {
log.Fatal(err)
}
// Clear the screen + print header
fmt.Printf("\033[H\033[2J")
fmt.Printf("Mode: %s, Interval: %s\n", config.modeName, config.interval)
fmt.Printf("(Hit Ctr-C to quit, re-run with -h for flags)\n")
fmt.Printf("%5s/%5s %5s %s\n", "WRITE", "READS", "PID", "COMMAND")
// Print the results
row := 3
for e := sortedP.Front(); e != nil; e = e.Next() {
row++
if row > tHeight {
break
}
val := e.Value.(twoP)
first := val.first
var humanW, humanR string
if *config.binary {
humanW, humanR = utils.HumanBinary(val.diffW), utils.HumanBinary(val.diffR)
} else {
humanW, humanR = utils.Human(val.diffW), utils.Human(val.diffR)
}
outstr := fmt.Sprintf("%5s %5s %5d %s", humanW, humanR, first.Pid, first.Cmdline)
l := len(outstr)
if l > tWidth {
l = tWidth
}
fmt.Printf("%s\n", outstr[0:l])
}
}
func modeNames() (string, string, string, error) {
switch *config.mode {
case 0:
return "read_bytes", "write_bytes", "bytes", nil
case 1:
return "syscr", "syscw", "syscalls", nil
case 2:
return "rchar", "wchar", "chars", nil
}
errstr := fmt.Sprintf("No such mode: %d\n", *config.mode)
return "", "", "", errors.New(errstr)
}
func receiveP(pRxChan <-chan process.Process) {
lastP := make(mapP)
flag := false
readKey, writeKey, modeName, err := modeNames()
if err != nil {
log.Fatal(err)
}
config.modeName = modeName
makeDiff := func(first, second process.Process) twoP {
firstValR, firstValW := first.Count[readKey], first.Count[writeKey]
secondValR, secondValW := second.Count[readKey], second.Count[writeKey]
diffR, diffW := utils.Abs(firstValR-secondValR), utils.Abs(firstValW-secondValW)
diff := diffR + diffW
return twoP{first, second, diff, diffR, diffW}
}
for p := range pRxChan {
if p.Last {
if flag {
printP(sortP(&lastP))
}
flag = !flag
} else {
if val, ok := lastP[p.Id]; ok {
if flag {
lastP[p.Id] = makeDiff(val.first, p)
} else {
lastP[p.Id] = makeDiff(p, val.second)
}
} else {
lastP[p.Id] = twoP{first: p}
}
}
}
}
func parseFlags() {
helpF := flag.Bool("v", false, "Print the version")
interF := flag.Int("i", 2, "Update interval in seconds")
config.binary = flag.Bool("b", false, "Use binary instead of deciman (e.g. kiB an not kB")
config.mode = flag.Int("m", 1, "The stats mode: 0:bytes 1:syscalls 2:chars")
flag.Parse()
config.banner = "gstat v0.1 (C) 2015 Paul buetow <http://gstat.buetow.org>"
if *helpF {
fmt.Println(config.banner)
os.Exit(0)
}
config.interval = time.Duration(*interF) * time.Second
}
func main() {
parseFlags()
tChan := make(chan bool)
dRxChan := make(chan diskstats.Diskstats)
pRxChan := make(chan process.Process)
go timedGather(tChan, dRxChan, pRxChan)
go receiveD(dRxChan)
go receiveP(pRxChan)
termChan := make(chan os.Signal, 1)
signal.Notify(termChan, os.Interrupt)
signal.Notify(termChan, syscall.SIGTERM)
go func() {
<-termChan
tChan <- false
fmt.Println("Good bye! This was:")
fmt.Println(config.banner)
os.Exit(0)
}()
for {
tChan <- true
time.Sleep(config.interval)
}
}
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