# #go
Вопрос:
Я написал код для разделения доменов, которые дают 200 ответов, и тех, которые этого не делают. Хотя у меня 3447 разных доменов, я получаю разные результаты после каждого запуска программы.
Источник, в котором я нашел домены: https://github.com/opendns/public-domain-lists/blob/master/opendns-random-domains.txt
wc -l example.txt
3447
package main
import (
"bufio"
"log"
"net/http"
"os"
"sync"
"time"
"github.com/panjf2000/ants"
)
var sitelist []string
func check(pool interface{}) {
address := pool.(string)
client := amp;http.Client{}
client.Timeout = time.Second * 5
req, _ := http.NewRequest("GET", "http://" address, nil)
if response, err := client.Do(req); err == nil {
status := response.StatusCode
if status == 200 {
// log.Println("Works:", address)
sitelist = append(sitelist, "works:" address)
return
}
// log.Println("Not working:", address)
sitelist = append(sitelist, "not-works:" address)
} else {
// log.Println("Not working:", address)
sitelist = append(sitelist, "not-works:" address)
}
}
func main() {
defer ants.Release()
var wg sync.WaitGroup
p, _ := ants.NewPoolWithFunc(1000, func(i interface{}) {
check(i)
wg.Done()
})
defer p.Release()
file, err := os.Open("example.txt")
if err != nil {
log.Fatal(err)
}
defer file.Close()
scanner := bufio.NewScanner(file)
for scanner.Scan() {
wg.Add(1)
a := scanner.Text()
_ = p.Invoke(string(a))
}
wg.Wait()
log.Println(len(sitelist))
}
go run ./main.go
3385
go run ./main.go
3338
go run ./main.go
3300
Я не могу понять, что я делаю не так. Спасибо
Я заметил, что когда я хочу использовать map, я получаю разные ошибки.
Код:
package main
import (
"bufio"
"fmt"
"log"
"net/http"
"os"
"sync"
"time"
"github.com/panjf2000/ants"
)
var (
sitelist = make(map[string]int8)
)
func check(pool interface{}) {
address := pool.(string)
client := amp;http.Client{}
client.Timeout = time.Second * 15
req, _ := http.NewRequest("GET", "http://" address, nil)
if response, err := client.Do(req); err == nil {
status := response.StatusCode
if status == 200 {
sitelist[string(address)] = 1
} else {
sitelist[string(address)] = 0
}
} else {
sitelist[string(address)] = 0
}
}
func main() {
defer ants.Release()
var wg sync.WaitGroup
p, _ := ants.NewPoolWithFunc(1000, func(i interface{}) {
check(i)
wg.Done()
})
defer p.Release()
file, err := os.Open("example.txt")
if err != nil {
log.Fatal(err)
}
defer file.Close()
scanner := bufio.NewScanner(file)
for scanner.Scan() {
wg.Add(1)
a := scanner.Text()
_ = p.Invoke(string(a))
}
wg.Wait()
fmt.Println(len(sitelist))
}
Вывод:
goroutine 4027 [select]:
net.cgoLookupIP({0x6b8778, 0xc002dff1c0}, {0x65d1b4, 0xf}, {0xc00073aa38, 0xc00003de10})
/usr/lib/go/src/net/cgo_unix.go:231 0x1b7
net.(*Resolver).lookupIP(0x842360, {0x6b8778, 0xc002dff1c0}, {0x65d1b4, 0x3}, {0xc00073aa38, 0xf})
/usr/lib/go/src/net/lookup_unix.go:97 0x128
net.glob..func1({0x6b8778, 0xc002dff1c0}, 0x0, {0x65d1b4, 0x0}, {0xc00073aa38, 0x5ea7d0})
/usr/lib/go/src/net/hook.go:23 0x3d
net.(*Resolver).lookupIPAddr.func1()
/usr/lib/go/src/net/lookup.go:296 0x9f
internal/singleflight.(*Group).doCall(0x842370, 0xc002a1b270, {0xc00035cc18, 0x13}, 0xc0014cfb80)
/usr/lib/go/src/internal/singleflight/singleflight.go:95 0x3b
created by internal/singleflight.(*Group).DoChan
/usr/lib/go/src/internal/singleflight/singleflight.go:88 0x2f1
goroutine 4028 [chan send]:
net.acquireThread()
/usr/lib/go/src/net/net.go:675 0x45
net.cgoLookupIPCNAME({0x65d1b4, 0x3}, {0xc00073aa38, 0x4})
/usr/lib/go/src/net/cgo_unix.go:146 0x85
net.cgoIPLookup(0x842370, {0x65d1b4, 0xc00035cc18}, {0xc00073aa38, 0xc0014cfb80})
/usr/lib/go/src/net/cgo_unix.go:220 0x3b
created by net.cgoLookupIP
/usr/lib/go/src/net/cgo_unix.go:230 0x125
goroutine 4053 [select]:
net.cgoLookupIP({0x6b8778, 0xc002f25140}, {0x65d1b4, 0xb}, {0xc000842f50, 0xc000040610})
/usr/lib/go/src/net/cgo_unix.go:231 0x1b7
net.(*Resolver).lookupIP(0x842360, {0x6b8778, 0xc002f25140}, {0x65d1b4, 0x3}, {0xc000842f50, 0xb})
/usr/lib/go/src/net/lookup_unix.go:97 0x128
net.glob..func1({0x6b8778, 0xc002f25140}, 0x0, {0x65d1b4, 0x0}, {0xc000842f50, 0x5ea7d0})
/usr/lib/go/src/net/hook.go:23 0x3d
net.(*Resolver).lookupIPAddr.func1()
/usr/lib/go/src/net/lookup.go:296 0x9f
internal/singleflight.(*Group).doCall(0x842370, 0xc002a97680, {0xc0006b2530, 0xf}, 0xc0014cfc30)
/usr/lib/go/src/internal/singleflight/singleflight.go:95 0x3b
created by internal/singleflight.(*Group).DoChan
/usr/lib/go/src/internal/singleflight/singleflight.go:88 0x2f1
goroutine 4054 [chan send]:
net.acquireThread()
/usr/lib/go/src/net/net.go:675 0x45
net.cgoLookupIPCNAME({0x65d1b4, 0x3}, {0xc000842f50, 0x4})
/usr/lib/go/src/net/cgo_unix.go:146 0x85
net.cgoIPLookup(0x842370, {0x65d1b4, 0xc0006b2530}, {0xc000842f50, 0xc0014cfc30})
/usr/lib/go/src/net/cgo_unix.go:220 0x3b
created by net.cgoLookupIP
/usr/lib/go/src/net/cgo_unix.go:230 0x125
goroutine 4029 [select]:
net.(*Resolver).lookupIPAddr(0x842360, {0x6b87e8, 0xc00173b4a0}, {0x65d1b4, 0x10}, {0xc000842f60, 0xd})
/usr/lib/go/src/net/lookup.go:302 0x5c7
net.(*Resolver).internetAddrList(0x6b87e8, {0x6b87e8, 0xc00173b4a0}, {0x65d1b4, 0x3}, {0xc000842f60, 0x10})
/usr/lib/go/src/net/ipsock.go:288 0x67a
net.(*Resolver).resolveAddrList(0x872790, {0x6b87e8, 0xc00173b4a0}, {0x65d30e, 0x4}, {0x65d1b4, 0xc000718d80}, {0xc000842f60, 0x10}, {0x0, ...})
/usr/lib/go/src/net/dial.go:221 0x41b
net.(*Dialer).DialContext(0xc00002c2a0, {0x6b87e8, 0xc00173b4a0}, {0x65d1b4, 0x7f61b406d4b8}, {0xc000842f60, 0x118})
/usr/lib/go/src/net/dial.go:406 0x448
net/http.(*Transport).dial(0xc00173b4a0, {0x6b87e8, 0xc00173b4a0}, {0x65d1b4, 0x5dcff9}, {0xc000842f60, 0xc00181bd00})
/usr/lib/go/src/net/http/transport.go:1166 0xda
net/http.(*Transport).dialConn(0x83cd80, {0x6b87e8, 0xc00173b4a0}, {{}, 0x0, {0xc00073aa80, 0x4}, {0xc000842f60, 0x10}, 0x0})
/usr/lib/go/src/net/http/transport.go:1604 0x845
net/http.(*Transport).dialConnFor(0xc00073aa38, 0xc0014cfd90)
/usr/lib/go/src/net/http/transport.go:1446 0xb0
created by net/http.(*Transport).queueForDial
/usr/lib/go/src/net/http/transport.go:1415 0x3d7
goroutine 4040 [select]:
net.cgoLookupIP({0x6b8778, 0xc002cb8640}, {0x65d1b4, 0xf}, {0xc00073aa68, 0xc000033e10})
/usr/lib/go/src/net/cgo_unix.go:231 0x1b7
net.(*Resolver).lookupIP(0x842360, {0x6b8778, 0xc002cb8640}, {0x65d1b4, 0x3}, {0xc00073aa68, 0xf})
/usr/lib/go/src/net/lookup_unix.go:97 0x128
net.glob..func1({0x6b8778, 0xc002cb8640}, 0x0, {0x65d1b4, 0x0}, {0xc00073aa68, 0x5ea7d0})
/usr/lib/go/src/net/hook.go:23 0x3d
net.(*Resolver).lookupIPAddr.func1()
/usr/lib/go/src/net/lookup.go:296 0x9f
internal/singleflight.(*Group).doCall(0x842370, 0xc0013fff90, {0xc00073b4a0, 0x13}, 0xc0014cfce0)
/usr/lib/go/src/internal/singleflight/singleflight.go:95 0x3b
created by internal/singleflight.(*Group).DoChan
/usr/lib/go/src/internal/singleflight/singleflight.go:88 0x2f1
goroutine 4041 [chan send]:
net.acquireThread()
/usr/lib/go/src/net/net.go:675 0x45
net.cgoLookupIPCNAME({0x65d1b4, 0x3}, {0xc00073aa68, 0x4})
/usr/lib/go/src/net/cgo_unix.go:146 0x85
net.cgoIPLookup(0x842370, {0x65d1b4, 0xc00073b4a0}, {0xc00073aa68, 0xc0014cfce0})
/usr/lib/go/src/net/cgo_unix.go:220 0x3b
created by net.cgoLookupIP
/usr/lib/go/src/net/cgo_unix.go:230 0x125
goroutine 4055 [select]:
net.(*Resolver).lookupIPAddr(0x842360, {0x6b87e8, 0xc001566720}, {0x65d1b4, 0x15}, {0xc0015462e8, 0x12})
/usr/lib/go/src/net/lookup.go:302 0x5c7
net.(*Resolver).internetAddrList(0x6b87e8, {0x6b87e8, 0xc001566720}, {0x65d1b4, 0x3}, {0xc0015462e8, 0x15})
/usr/lib/go/src/net/ipsock.go:288 0x67a
net.(*Resolver).resolveAddrList(0x872790, {0x6b87e8, 0xc001566720}, {0x65d30e, 0x4}, {0x65d1b4, 0xc00006e000}, {0xc0015462e8, 0x15}, {0x0, ...})
/usr/lib/go/src/net/dial.go:221 0x41b
net.(*Dialer).DialContext(0xc00002c2a0, {0x6b87e8, 0xc001566720}, {0x65d1b4, 0x7f61b417e378}, {0xc0015462e8, 0x118})
/usr/lib/go/src/net/dial.go:406 0x448
net/http.(*Transport).dial(0xc001566720, {0x6b87e8, 0xc001566720}, {0x65d1b4, 0x5dcff9}, {0xc0015462e8, 0xc0013d2c00})
/usr/lib/go/src/net/http/transport.go:1166 0xda
net/http.(*Transport).dialConn(0x83cd80, {0x6b87e8, 0xc001566720}, {{}, 0x0, {0xc00047c160, 0x4}, {0xc0015462e8, 0x15}, 0x0})
/usr/lib/go/src/net/http/transport.go:1604 0x845
net/http.(*Transport).dialConnFor(0xc000842f50, 0xc000fff1e0)
/usr/lib/go/src/net/http/transport.go:1446 0xb0
created by net/http.(*Transport).queueForDial
/usr/lib/go/src/net/http/transport.go:1415 0x3d7
goroutine 4030 [select]:
net.cgoLookupIP({0x6b8778, 0xc002dff280}, {0x65d1b4, 0xd}, {0xc000842f60, 0xc00003de10})
/usr/lib/go/src/net/cgo_unix.go:231 0x1b7
net.(*Resolver).lookupIP(0x842360, {0x6b8778, 0xc002dff280}, {0x65d1b4, 0x3}, {0xc000842f60, 0xd})
/usr/lib/go/src/net/lookup_unix.go:97 0x128
net.glob..func1({0x6b8778, 0xc002dff280}, 0x0, {0x65d1b4, 0x0}, {0xc000842f60, 0x5ea7d0})
/usr/lib/go/src/net/hook.go:23 0x3d
net.(*Resolver).lookupIPAddr.func1()
/usr/lib/go/src/net/lookup.go:296 0x9f
internal/singleflight.(*Group).doCall(0x842370, 0xc002a1b2c0, {0xc00035cc30, 0x11}, 0xc0014cfd90)
/usr/lib/go/src/internal/singleflight/singleflight.go:95 0x3b
created by internal/singleflight.(*Group).DoChan
/usr/lib/go/src/internal/singleflight/singleflight.go:88 0x2f1
goroutine 4031 [chan send]:
net.acquireThread()
/usr/lib/go/src/net/net.go:675 0x45
net.cgoLookupIPCNAME({0x65d1b4, 0x3}, {0xc000842f60, 0x4})
/usr/lib/go/src/net/cgo_unix.go:146 0x85
net.cgoIPLookup(0x842370, {0x65d1b4, 0xc00035cc30}, {0xc000842f60, 0xc0014cfd90})
/usr/lib/go/src/net/cgo_unix.go:220 0x3b
created by net.cgoLookupIP
/usr/lib/go/src/net/cgo_unix.go:230 0x125
goroutine 4042 [select]:
net.(*Resolver).lookupIPAddr(0x842360, {0x6b87e8, 0xc001eb28a0}, {0x65d1b4, 0x12}, {0xc00073ad68, 0xf})
/usr/lib/go/src/net/lookup.go:302 0x5c7
net.(*Resolver).internetAddrList(0x6b87e8, {0x6b87e8, 0xc001eb28a0}, {0x65d1b4, 0x3}, {0xc00073ad68, 0x12})
/usr/lib/go/src/net/ipsock.go:288 0x67a
net.(*Resolver).resolveAddrList(0x872790, {0x6b87e8, 0xc001eb28a0}, {0x65d30e, 0x4}, {0x65d1b4, 0xc0007193e0}, {0xc00073ad68, 0x12}, {0x0, ...})
/usr/lib/go/src/net/dial.go:221 0x41b
net.(*Dialer).DialContext(0xc00002c2a0, {0x6b87e8, 0xc001eb28a0}, {0x65d1b4, 0x7f61b41711f8}, {0xc00073ad68, 0x118})
/usr/lib/go/src/net/dial.go:406 0x448
net/http.(*Transport).dial(0xc001eb28a0, {0x6b87e8, 0xc001eb28a0}, {0x65d1b4, 0x5dcff9}, {0xc00073ad68, 0xc00147a000})
/usr/lib/go/src/net/http/transport.go:1166 0xda
net/http.(*Transport).dialConn(0x83cd80, {0x6b87e8, 0xc001eb28a0}, {{}, 0x0, {0xc000690840, 0x4}, {0xc00073ad68, 0x12}, 0x0})
/usr/lib/go/src/net/http/transport.go:1604 0x845
net/http.(*Transport).dialConnFor(0xc00073aa68, 0xc001ecc000)
/usr/lib/go/src/net/http/transport.go:1446 0xb0
created by net/http.(*Transport).queueForDial
/usr/lib/go/src/net/http/transport.go:1415 0x3d7
goroutine 4032 [select]:
net.(*Resolver).lookupIPAddr(0x842360, {0x6b87e8, 0xc00159cf00}, {0x65d1b4, 0x13}, {0xc0000bea38, 0x10})
/usr/lib/go/src/net/lookup.go:302 0x5c7
net.(*Resolver).internetAddrList(0x6b87e8, {0x6b87e8, 0xc00159cf00}, {0x65d1b4, 0x3}, {0xc0000bea38, 0x13})
/usr/lib/go/src/net/ipsock.go:288 0x67a
net.(*Resolver).resolveAddrList(0x872790, {0x6b87e8, 0xc00159cf00}, {0x65d30e, 0x4}, {0x65d1b4, 0xc0003a6b60}, {0xc0000bea38, 0x13}, {0x0, ...})
/usr/lib/go/src/net/dial.go:221 0x41b
net.(*Dialer).DialContext(0xc00002c2a0, {0x6b87e8, 0xc00159cf00}, {0x65d1b4, 0x7f61b406d4b8}, {0xc0000bea38, 0x118})
/usr/lib/go/src/net/dial.go:406 0x448
net/http.(*Transport).dial(0xc00159cf00, {0x6b87e8, 0xc00159cf00}, {0x65d1b4, 0x5dcff9}, {0xc0000bea38, 0xc0015bb800})
/usr/lib/go/src/net/http/transport.go:1166 0xda
net/http.(*Transport).dialConn(0x83cd80, {0x6b87e8, 0xc00159cf00}, {{}, 0x0, {0xc0003c0750, 0x4}, {0xc0000bea38, 0x13}, 0x0})
/usr/lib/go/src/net/http/transport.go:1604 0x845
net/http.(*Transport).dialConnFor(0xc000842f60, 0xc001379970)
/usr/lib/go/src/net/http/transport.go:1446 0xb0
created by net/http.(*Transport).queueForDial
/usr/lib/go/src/net/http/transport.go:1415 0x3d7
goroutine 4056 [select]:
net.cgoLookupIP({0x6b8778, 0xc002f25200}, {0x65d1b4, 0x12}, {0xc0015462e8, 0xc000040610})
/usr/lib/go/src/net/cgo_unix.go:231 0x1b7
net.(*Resolver).lookupIP(0x842360, {0x6b8778, 0xc002f25200}, {0x65d1b4, 0x3}, {0xc0015462e8, 0x12})
/usr/lib/go/src/net/lookup_unix.go:97 0x128
net.glob..func1({0x6b8778, 0xc002f25200}, 0x0, {0x65d1b4, 0x0}, {0xc0015462e8, 0x5ea7d0})
/usr/lib/go/src/net/hook.go:23 0x3d
net.(*Resolver).lookupIPAddr.func1()
/usr/lib/go/src/net/lookup.go:296 0x9f
internal/singleflight.(*Group).doCall(0x842370, 0xc002a976d0, {0xc000690f00, 0x16}, 0xc000fff1e0)
/usr/lib/go/src/internal/singleflight/singleflight.go:95 0x3b
created by internal/singleflight.(*Group).DoChan
/usr/lib/go/src/internal/singleflight/singleflight.go:88 0x2f1
goroutine 4057 [chan send]:
net.acquireThread()
/usr/lib/go/src/net/net.go:675 0x45
net.cgoLookupIPCNAME({0x65d1b4, 0x3}, {0xc0015462e8, 0x4})
/usr/lib/go/src/net/cgo_unix.go:146 0x85
net.cgoIPLookup(0x842370, {0x65d1b4, 0xc000690f00}, {0xc0015462e8, 0xc000fff1e0})
/usr/lib/go/src/net/cgo_unix.go:220 0x3b
created by net.cgoLookupIP
/usr/lib/go/src/net/cgo_unix.go:230 0x125
goroutine 4043 [select]:
net.cgoLookupIP({0x6b8778, 0xc002cb8700}, {0x65d1b4, 0xf}, {0xc00073ad68, 0xc000033e10})
/usr/lib/go/src/net/cgo_unix.go:231 0x1b7
net.(*Resolver).lookupIP(0x842360, {0x6b8778, 0xc002cb8700}, {0x65d1b4, 0x3}, {0xc00073ad68, 0xf})
/usr/lib/go/src/net/lookup_unix.go:97 0x128
net.glob..func1({0x6b8778, 0xc002cb8700}, 0x0, {0x65d1b4, 0x0}, {0xc00073ad68, 0x5ea7d0})
/usr/lib/go/src/net/hook.go:23 0x3d
net.(*Resolver).lookupIPAddr.func1()
/usr/lib/go/src/net/lookup.go:296 0x9f
internal/singleflight.(*Group).doCall(0x842370, 0xc002ce2000, {0xc00073b4b8, 0x13}, 0xc001ecc000)
/usr/lib/go/src/internal/singleflight/singleflight.go:95 0x3b
created by internal/singleflight.(*Group).DoChan
/usr/lib/go/src/internal/singleflight/singleflight.go:88 0x2f1
goroutine 4033 [select]:
net.cgoLookupIP({0x6b8778, 0xc002dff340}, {0x65d1b4, 0x10}, {0xc0000bea38, 0xc00003de10})
/usr/lib/go/src/net/cgo_unix.go:231 0x1b7
net.(*Resolver).lookupIP(0x842360, {0x6b8778, 0xc002dff340}, {0x65d1b4, 0x3}, {0xc0000bea38, 0x10})
/usr/lib/go/src/net/lookup_unix.go:97 0x128
net.glob..func1({0x6b8778, 0xc002dff340}, 0x0, {0x65d1b4, 0x0}, {0xc0000bea38, 0x5ea7d0})
/usr/lib/go/src/net/hook.go:23 0x3d
net.(*Resolver).lookupIPAddr.func1()
/usr/lib/go/src/net/lookup.go:296 0x9f
internal/singleflight.(*Group).doCall(0x842370, 0xc002a1b310, {0xc00035cc48, 0x14}, 0xc001379970)
/usr/lib/go/src/internal/singleflight/singleflight.go:95 0x3b
created by internal/singleflight.(*Group).DoChan
/usr/lib/go/src/internal/singleflight/singleflight.go:88 0x2f1
goroutine 4044 [chan send]:
net.acquireThread()
/usr/lib/go/src/net/net.go:675 0x45
net.cgoLookupIPCNAME({0x65d1b4, 0x3}, {0xc00073ad68, 0x4})
/usr/lib/go/src/net/cgo_unix.go:146 0x85
net.cgoIPLookup(0x842370, {0x65d1b4, 0xc00073b4b8}, {0xc00073ad68, 0xc001ecc000})
/usr/lib/go/src/net/cgo_unix.go:220 0x3b
created by net.cgoLookupIP
/usr/lib/go/src/net/cgo_unix.go:230 0x125
goroutine 4066 [chan send]:
net.acquireThread()
/usr/lib/go/src/net/net.go:675 0x45
net.cgoLookupIPCNAME({0x65d1b4, 0x3}, {0xc0000bea38, 0x4})
/usr/lib/go/src/net/cgo_unix.go:146 0x85
net.cgoIPLookup(0x842370, {0x65d1b4, 0xc00035cc48}, {0xc0000bea38, 0xc001379970})
/usr/lib/go/src/net/cgo_unix.go:220 0x3b
created by net.cgoLookupIP
/usr/lib/go/src/net/cgo_unix.go:230 0x125
goroutine 4001 [chan send]:
net.acquireThread()
/usr/lib/go/src/net/net.go:675 0x45
net.cgoLookupIPCNAME({0x65d1b4, 0x3}, {0xc0005908e0, 0x4})
/usr/lib/go/src/net/cgo_unix.go:146 0x85
net.cgoIPLookup(0x842370, {0x65d1b4, 0xc0005908f0}, {0xc0005908e0, 0xc0020ec420})
/usr/lib/go/src/net/cgo_unix.go:220 0x3b
created by net.cgoLookupIP
/usr/lib/go/src/net/cgo_unix.go:230 0x125
goroutine 1744 [select]:
net.(*netFD).connect.func2()
/usr/lib/go/src/net/fd_unix.go:119 0x9e
created by net.(*netFD).connect
/usr/lib/go/src/net/fd_unix.go:118 0x385
exit status 2
...
Комментарии:
1. Быстрый просмотр документов ants показал, что срок действия составляет 1 секунду. Кроме того, ваш список не является потокобезопасным.
2. Тайм-аут в 5 секунд на клиенте также может вызвать проблемы. Я определенно видел сайты, на которые требуется примерно столько времени, чтобы ответить
3. Я пробовал разные тайм-ауты, но результат все тот же. Кроме того, почему мой список не является потокобезопасным?
4. Вы добавили часть трассировки стека без фактического сообщения об ошибке, но я предполагаю, что это фатальная ошибка «одновременного использования map». У вас не может быть нескольких программ, записывающих в одну и ту же структуру данных одновременно. Даже если ваши тайм-ауты достаточны, и каждый запрос каждый раз отвечает одинаково, а неспособность прочитать и закрыть ответы не вызывает никаких проблем, у вас все равно есть гонка данных.
Ответ №1:
В соответствии с приведенными ответами я понял, что существует случай гонки данных.
Я решил это с помощью внешней функции с помощью sync.Mutex
package main
import (
"bufio"
"fmt"
"log"
"net/http"
"os"
"sync"
"time"
"github.com/panjf2000/ants"
)
var (
sitelist = make(map[string]int8)
)
var wg sync.WaitGroup
var m sync.Mutex
func add(address string, status int8, m *sync.Mutex) {
m.Lock()
sitelist[address] = status
m.Unlock()
}
func check(pool interface{}) {
address := pool.(string)
client := amp;http.Client{}
client.Timeout = time.Second * 45
req, _ := http.NewRequest("GET", "http://" address, nil)
if response, err := client.Do(req); err == nil {
status := response.StatusCode
if status == 200 {
add(address, 1, amp;m)
} else {
add(address, 0, amp;m)
}
} else {
add(address, 0, amp;m)
}
}
func main() {
defer ants.Release()
p, _ := ants.NewPoolWithFunc(1000, func(i interface{}) {
check(i)
wg.Done()
})
defer p.Release()
file, err := os.Open("example.txt")
if err != nil {
log.Fatal(err)
}
defer file.Close()
scanner := bufio.NewScanner(file)
for scanner.Scan() {
a := scanner.Text()
wg.Add(1)
_ = p.Invoke(string(a))
}
wg.Wait()
fmt.Println(len(sitelist))
}