Proxy list parser on Go

golang_proxy_parser.go

package main

import (
    "fmt"
    "github.com/opesun/goquery"
    "io/ioutil"
    "net/http"
    "os"
    "strconv"
    "time"
)

func check(e error) {
    if e != nil {
        panic(e)
    }
}

func main() {
    for {
        f, err := os.OpenFile("proxylist.txt", os.O_APPEND|os.O_WRONLY, 0600)
        check(err)

        defer f.Close()

        for i := 0; i < 11; i++ {
            res, err := http.Get("http://proxy-list.org/russian/search.php?search=&country=RU&type=any&port=any&ssl=any&reset=Reset+search&p=" + strconv.Itoa(i))
            if nil != err {
                fmt.Println(err)
                continue
            }
            text, err := ioutil.ReadAll(res.Body)
            res.Body.Close()
            check(err)
            result, err := goquery.ParseString(string(text))
            for _, v := range result.Find(".proxy").HtmlAll() {
                if v == "Прокси" {
                    continue
                }
                if _, err = f.WriteString(v + "\n"); err != nil {
                    panic(err)
                }
            }
        }

        res, err := http.Get("http://proxy-ip-list.com/fresh-proxy-list.html")
        if nil != err {
            fmt.Println(err)
        } else {
            text, err := ioutil.ReadAll(res.Body)
            res.Body.Close()
            check(err)
            result, err := goquery.ParseString(string(text))
            i := 0
            for _, v := range result.Find(".table_body tr td:first").HtmlAll() {
                i++
                if i == 1 {
                    if _, err = f.WriteString(v + "\n"); err != nil {
                        panic(err)
                    }
                }
                if i == 5 {
                    i = 0
                }

            }
        }

        fmt.Println("ok")
        time.Sleep(10 * time.Minute)
    }
}