在不同函数中定义的标志,同步给出错误
Flags defined in different functions with sync giving error
我想 运行 两个函数同时使用一些标志,但如果它们不调用标志,下面的 golang 脚本就可以工作 go run ping.go
即,它们将使用默认值。
ping.go 下方文件
package main
import (
// "io/ioutil"
// "log"
"flag"
"fmt"
"net/http"
"sync"
"time"
)
func pingone() {
websiteone := flag.String("websiteone", "adminone", "Zdefault website")
flag.Parse()
// using/printing flags to avoid error
fmt.Println("website:", *websiteone)
eurl := "https://thesiteone.com/"
happ := "/subpage"
for {
resp, err := http.Get(eurl + *websiteone + happ)
if err != nil {
continue
}
fmt.Println(resp)
time.Sleep(2 * time.Second)
}
}
func pingtwo() {
websitetwo := flag.String("websitetwo", "admintwo", "Zdefault website")
flag.Parse()
// using/printing flags to avoid error
fmt.Println("website:", *websitetwo)
eurltwo := "https://thesitetwo.com/"
happtwo := "/subpage"
for {
resp, err := http.Get(eurltwo + *websitetwo + happtwo)
if err != nil {
continue
}
fmt.Println(resp)
time.Sleep(2 * time.Second)
}
}
func main() {
var wg sync.WaitGroup
fmt.Printf("Both pingone and pingtwo started\n")
wg.Add(2)
go pingone()
go pingtwo()
wg.Wait()
fmt.Printf("both pingone and pingtwo have finished\n")
}
但是如果我们同时调用这两个标志
go run ping.go --websitetwo='secondsuburl' --websiteone='firstsuburl'
结果他们失事了
** 关于上面的代码**
该脚本将 运行 两个函数都使用同步同时 ping 不同的网站。
不要混淆,这里 url 被分成三个 parts/string :第二部分是标志定义的地方。
下面的输出
root@localhost:~# go run ping.go --websiteone=admin1 --websitetwo=admin2
Both pingone and pingtwo started
flag provided but not defined: -websiteone
Usage of /tmp/go-build010683275/b001/exe/ping:
-websiteone string
Zdefault website (default "adminone")
website: admin1
-websitetwo string
Zdefault website (default "admintwo")
exit status 2
你不应该单独放置标志 arg 语句,将它们放在一个函数中,调用一次 flag.Parse()
,然后将参数传递给 pingone()
和 pingtwo()
。
我在下面调整了您的代码,应该可以解决您的问题
package main
import (
"flag"
"fmt"
"net/http"
"sync"
"time"
)
func pingone(websiteone *string) {
fmt.Println("website:", *websiteone)
eurl := "https://thesiteone.com/"
happ := "/subpage"
for {
resp, err := http.Get(eurl + *websiteone + happ)
if err != nil {
continue
}
fmt.Println(resp)
time.Sleep(2 * time.Second)
}
}
func pingtwo(websitetwo *string) {
fmt.Println("website:", *websitetwo)
eurltwo := "https://thesitetwo.com/"
happtwo := "/subpage"
for {
resp, err := http.Get(eurltwo + *websitetwo + happtwo)
if err != nil {
continue
}
fmt.Println(resp)
time.Sleep(2 * time.Second)
}
}
func main() {
websiteone := flag.String("websiteone", "adminone", "Zdefault website")
websitetwo := flag.String("websitetwo", "admintwo", "Zdefault website")
flag.Parse()
var wg sync.WaitGroup
fmt.Printf("Both pingone and pingtwo started\n")
wg.Add(2)
go pingone(websiteone)
go pingtwo(websitetwo)
wg.Wait()
fmt.Printf("both pingone and pingtwo have finished\n")
}
我想 运行 两个函数同时使用一些标志,但如果它们不调用标志,下面的 golang 脚本就可以工作 go run ping.go
即,它们将使用默认值。
ping.go 下方文件
package main
import (
// "io/ioutil"
// "log"
"flag"
"fmt"
"net/http"
"sync"
"time"
)
func pingone() {
websiteone := flag.String("websiteone", "adminone", "Zdefault website")
flag.Parse()
// using/printing flags to avoid error
fmt.Println("website:", *websiteone)
eurl := "https://thesiteone.com/"
happ := "/subpage"
for {
resp, err := http.Get(eurl + *websiteone + happ)
if err != nil {
continue
}
fmt.Println(resp)
time.Sleep(2 * time.Second)
}
}
func pingtwo() {
websitetwo := flag.String("websitetwo", "admintwo", "Zdefault website")
flag.Parse()
// using/printing flags to avoid error
fmt.Println("website:", *websitetwo)
eurltwo := "https://thesitetwo.com/"
happtwo := "/subpage"
for {
resp, err := http.Get(eurltwo + *websitetwo + happtwo)
if err != nil {
continue
}
fmt.Println(resp)
time.Sleep(2 * time.Second)
}
}
func main() {
var wg sync.WaitGroup
fmt.Printf("Both pingone and pingtwo started\n")
wg.Add(2)
go pingone()
go pingtwo()
wg.Wait()
fmt.Printf("both pingone and pingtwo have finished\n")
}
但是如果我们同时调用这两个标志
go run ping.go --websitetwo='secondsuburl' --websiteone='firstsuburl'
结果他们失事了
** 关于上面的代码**
该脚本将 运行 两个函数都使用同步同时 ping 不同的网站。
不要混淆,这里 url 被分成三个 parts/string :第二部分是标志定义的地方。
下面的输出
root@localhost:~# go run ping.go --websiteone=admin1 --websitetwo=admin2
Both pingone and pingtwo started
flag provided but not defined: -websiteone
Usage of /tmp/go-build010683275/b001/exe/ping:
-websiteone string
Zdefault website (default "adminone")
website: admin1
-websitetwo string
Zdefault website (default "admintwo")
exit status 2
你不应该单独放置标志 arg 语句,将它们放在一个函数中,调用一次 flag.Parse()
,然后将参数传递给 pingone()
和 pingtwo()
。
我在下面调整了您的代码,应该可以解决您的问题
package main
import (
"flag"
"fmt"
"net/http"
"sync"
"time"
)
func pingone(websiteone *string) {
fmt.Println("website:", *websiteone)
eurl := "https://thesiteone.com/"
happ := "/subpage"
for {
resp, err := http.Get(eurl + *websiteone + happ)
if err != nil {
continue
}
fmt.Println(resp)
time.Sleep(2 * time.Second)
}
}
func pingtwo(websitetwo *string) {
fmt.Println("website:", *websitetwo)
eurltwo := "https://thesitetwo.com/"
happtwo := "/subpage"
for {
resp, err := http.Get(eurltwo + *websitetwo + happtwo)
if err != nil {
continue
}
fmt.Println(resp)
time.Sleep(2 * time.Second)
}
}
func main() {
websiteone := flag.String("websiteone", "adminone", "Zdefault website")
websitetwo := flag.String("websitetwo", "admintwo", "Zdefault website")
flag.Parse()
var wg sync.WaitGroup
fmt.Printf("Both pingone and pingtwo started\n")
wg.Add(2)
go pingone(websiteone)
go pingtwo(websitetwo)
wg.Wait()
fmt.Printf("both pingone and pingtwo have finished\n")
}