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cli.go
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/
cli.go
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package main
import (
"flag"
"log"
"net"
"time"
)
var (
concurrency int
saddr string
)
func init() {
log.SetFlags(log.LstdFlags | log.Lshortfile)
flag.StringVar(&saddr, "S", ":18080", "server address")
flag.IntVar(&concurrency, "c", 1, "Number of multiple echo to make at a time")
flag.Parse()
}
func main() {
for i := 0; i < concurrency; i++ {
go udpEchoLoop()
}
select {}
}
func udpEchoLoop() {
addr, err := net.ResolveUDPAddr("udp", saddr)
if err != nil {
log.Fatal(err)
}
conn, err := net.DialUDP("udp", nil, addr)
if err != nil {
log.Fatal(err)
}
msg := []byte(`abcdefghijklmnopqrstuvwxyz`)
for {
if _, err := conn.Write(msg); err != nil {
log.Fatal(err)
}
b := make([]byte, 1024)
_, err := conn.Read(b)
if err != nil {
log.Fatal(err)
}
// log.Println(string(b[:n]))
time.Sleep(100 * time.Millisecond)
}
}