/
hello.go
73 lines (66 loc) · 1.37 KB
/
hello.go
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/*
tools for check server:port available
author: smallfish
*/
package main
import (
"net"
"fmt"
"time"
"flag"
"strings"
"sync"
"os"
"io/ioutil"
)
var (
file string
limit int
timeout int
wg sync.WaitGroup
ch chan int
)
func init() {
flag.StringVar(&file, "file", "", "host:port file")
flag.IntVar(&limit, "limit", 10, "limit concurrency, default: 10")
flag.IntVar(&timeout, "timeout", 5, "connect timeout, default: 5")
}
func getAddrs(file string) ([]string) {
byte, err := ioutil.ReadFile(file)
if err != nil {
return nil
}
var ret []string
for _, val := range strings.Split(string(byte), "\n") {
if len(val) > 2 {
ret = append(ret, val)
}
}
return ret
}
func work(addr string) {
ch <- 1
conn, err := net.DialTimeout("tcp", addr, time.Duration(timeout) * time.Second)
if err != nil {
fmt.Printf("%s\tERROR\n", addr)
} else {
conn.Close()
fmt.Printf("%s\tOK\n", addr)
}
wg.Done()
<-ch
}
func main() {
flag.Usage = func() { flag.PrintDefaults() }
flag.Parse()
if file == "" {
flag.PrintDefaults()
os.Exit(0)
}
ch = make(chan int, limit)
for _, addr := range getAddrs(file) {
wg.Add(1)
go work(addr)
}
wg.Wait()
}