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net_charger.go
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/
net_charger.go
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package main
import (
"fmt"
"log"
"net"
"os"
"os/signal"
"sync"
"sync/atomic"
"syscall"
"time"
)
func main() {
// Usage:
// listen | [host1 host2 ...]
if len(os.Args) == 1 {
fmt.Printf("Usage: %s listen | [host1 host2 ...]\n", os.Args[0])
return
}
if len(os.Args) > 1 && os.Args[1] == "listen" {
log.Print("Listen mode")
doServer()
return
}
var wg sync.WaitGroup
var perSecond uint32 = 0
go measure(&perSecond)
cancelChan := make(chan os.Signal, 1)
signal.Notify(cancelChan, syscall.SIGTERM, syscall.SIGINT)
lim := syscall.Rlimit{}
err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &lim)
if err != nil {
log.Print(err)
}
log.Printf("Current limit: %d", lim.Cur)
var done uint32 = 0
for i := uint64(0); i < lim.Cur-10; i++ {
hostIdx := i % (uint64(len(os.Args)) - 1)
go connection(os.Args[hostIdx + 1], &wg, &perSecond, &done)
}
<-cancelChan
atomic.AddUint32(&done, 1)
log.Print("Caught signal, canceling...")
wg.Wait()
}
func measure(count *uint32) {
c := time.Tick(1 * time.Second)
for {
<-c
log.Printf("%d", atomic.SwapUint32(count, 0))
}
}
func connection(host string, wg *sync.WaitGroup, count *uint32, done *uint32) {
fullHost := fmt.Sprintf("%s:1223", host)
for atomic.LoadUint32(done) == 0 {
wg.Add(1)
tcp, err := net.Dial("tcp", fullHost)
if err != nil {
log.Print(err)
wg.Done()
continue
}
_, err = tcp.Write([]byte("GET / HTTP/1.1\r"))
if err != nil {
log.Print(err)
tcp.Close()
wg.Done()
continue
}
atomic.AddUint32(count, 1)
tcp.Close()
wg.Done()
}
}