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hogs.go
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hogs.go
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package main
import (
"bufio"
"flag"
"fmt"
"io/ioutil"
"log"
"net/http"
"net/url"
"os"
"os/user"
"runtime"
"runtime/pprof"
"strconv"
"strings"
"time"
)
type set map[string]struct{}
func (s set) add(x string) set {
if s == nil {
s = make(set)
}
s[x] = struct{}{}
return s
}
func (s set) get() []string {
x := []string{}
for i := range s {
x = append(x, i)
}
return x
}
type pt struct {
sent float64
recv float64
users set
}
type DATA struct {
val map[string]pt
filename string
}
func check(err error) {
if err != nil {
log.Fatal(err)
}
}
//flags
var (
datatable string
datatableclass string
ptype string
cpuprofile string
)
func main() {
runtime.GOMAXPROCS(runtime.NumCPU())
start := time.Now()
flag.StringVar(&datatable, "datatable", "", "Datatable server details")
flag.StringVar(&datatableclass, "class", "nethogs", "Classname for Datatable")
flag.StringVar(&ptype, "type", "", "How to print the data to STDOUT")
flag.StringVar(&cpuprofile, "cpuprofile", "", "Write CPU Profile to file")
flag.Parse()
if cpuprofile != "" {
f, err := os.Create(cpuprofile)
if err != nil {
log.Fatal(err)
}
pprof.StartCPUProfile(f)
defer pprof.StopCPUProfile()
}
collection := make([]DATA, 1)
// A channel for sending and receiving values
dchan := make(chan DATA, flag.NArg()+1)
for i := 0; i < flag.NArg(); i++ {
filename := flag.Args()[i]
go parsefile(filename, dchan)
}
for i := 0; i < flag.NArg(); i++ {
data := <-dchan
collection = append(collection, data)
if ptype == "pretty" {
data.prettyprint()
} else if ptype == "csv" {
fmt.Print(data.getcsv())
} else {
log.Printf("[DONE] [%s] %s", time.Since(start), data.filename)
}
}
if datatable != "" {
send_to_datatable(collection)
}
}
// This will be called from a go routine
func parsefile(filename string, d chan DATA) {
data := DATA{map[string]pt{}, filename}
file, err := os.Open(filename)
check(err)
scanner := bufio.NewScanner(file)
for scanner.Scan() {
data.parseline(scanner.Text())
}
if err = scanner.Err(); err != nil {
log.Print(err)
d <- data
}
d <- data
}
func (d DATA) parseline(line string) {
data := d.val
l := strings.Fields(line)
if len(l) < 3 {
return
}
recv, err := strconv.ParseFloat(l[len(l)-1], 64)
if err != nil {
return
}
sent, err := strconv.ParseFloat(l[len(l)-2], 64)
if err != nil {
return
}
processCol := strings.Join(l[0:len(l)-2], "_")
processdata := strings.Split(processCol, "/")
if len(processdata) < 3 {
return
}
pname := strings.Join(processdata[0:len(processdata)-2], "/")
if strings.Index(pname, ":") != -1 && strings.Index(pname, "-") != -1 {
pname = strings.Split(pname, "-")[0]
}
ud, err := user.LookupId(processdata[len(processdata)-1])
if err != nil {
ud = &user.User{"-1", "-1", "dontknow", "dontknow", "/home/dontknow"}
}
data[pname] = pt{
data[pname].sent + sent,
data[pname].recv + recv,
data[pname].users.add(ud.Username),
}
}
func (d DATA) prettyprint() {
fmt.Printf("Output for file = %s\n\n", d.filename)
data := d.val
for proc, _ := range data {
fmt.Printf("%40s\t%10.2f\t%10.2f\t%40s\n", proc, data[proc].sent, data[proc].recv,
strings.Join(data[proc].users.get(), ","))
}
fmt.Printf("\n\n")
}
func (d DATA) getcsv() string {
data := d.val
csv := ""
hostname, _ := os.Hostname()
for proc, _ := range data {
csv = csv + fmt.Sprintf("%s,%.2f,%.2f,%s,%s,%s\n",
proc, data[proc].sent, data[proc].recv,
strings.Join(data[proc].users.get(), " "),
d.filename, hostname)
}
return csv
}
func send_to_datatable(collection []DATA) {
hostname, _ := os.Hostname()
params := url.Values{}
params.Set("class", datatableclass)
params.Set("host", hostname)
csvdata := ""
for i := range collection {
csvdata = csvdata + collection[i].getcsv()
}
params.Set("data", csvdata)
if strings.Index(datatable, "http://") != 0 {
datatable = "http://" + datatable
}
resp, err := http.PostForm(datatable+"/api/put", params)
check(err)
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
check(err)
fmt.Println(string(body))
}