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proxy.go
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proxy.go
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package dl
import (
"flag"
"io/ioutil"
"net/http"
"net/url"
"strings"
"time"
"github.com/golang/glog"
"github.com/juju/errors"
)
var (
proxyHost = flag.String(
"proxy_server",
"http://127.0.0.1:8118",
"proxy server address")
)
const (
proxyGet = "/get"
proxyReport = "/bad"
)
type ProxyType int
const (
Invalid ProxyType = iota
HTTP
HTTPS
Socks5
)
func GetProxyType(proxy string) ProxyType {
if strings.HasPrefix(proxy, "https") {
return HTTPS
}
if strings.HasPrefix(proxy, "http") {
return HTTP
}
if strings.HasPrefix(proxy, "socks5") {
return Socks5
}
return Invalid
}
func GetProxy() (string, error) {
client := &http.Client{
Timeout: time.Second * 5,
}
url := *proxyHost + proxyGet
for i := 0; i < 3; i++ {
resp, err := client.Get(url)
if err != nil {
glog.Error("failed to get proxy, retry: ", i, "msg: ", err)
continue
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
glog.Error("failed to read proxy, retry: ", i, "msg: ", err)
continue
}
return "http://" + string(body), nil
}
return "", errors.Trace(errors.New("failed to get proxy finally"))
}
func ReportProxyStatus(proxy string) error {
if len(proxy) == 0 {
return nil
}
client := &http.Client{
Timeout: time.Second * 5,
}
reportUrl := *proxyHost + proxyReport
data := url.Values{}
data.Add("p", proxy)
resp, err := client.Post(reportUrl, "application/x-www-form-urlencoded", strings.NewReader(data.Encode()))
if err != nil {
return errors.Trace(err)
}
defer resp.Body.Close()
return nil
}