go language to achieve capturing hd images

I saw a lot of python, and then I wrote an go, which can grab hd pictures

getp.go

package main

import (

    "io/ioutil"

    "log"

    "net/http"

    "os"

    "regexp"

    "strconv"

    "strings"

    "sync"

)

var urlist [4]string

var album chan string

var w sync.WaitGroup

var dir string

func main() {

    dir = "tmp/"

    err := os.Mkdir(dir, 0777)

    if err != nil {

        isexist := os.IsExist(err)

        log.Println(isexist)

    }

    album = make(chan string, 200)

    urlist = [4]string{"http://me2-sex.lofter.com/tag/%E7%BE%8E%E5%A5%B3%E6%91%84%E5%BD%B1?page=", "http://me2-sex.lofter.com/tag/%E6%AC%A7%E7%BE%8E?page=", "http://me2-sex.lofter.com/tag/%E6%A8%A1%E7%89%B9?page=", "http://me2-sex.lofter.com/tag/%E7%BE%8E%E5%AA%9B%E9%A6%86?page="}

    for _, v := range urlist {

        for i := 1; i <= 20; i++ {

            url := v + strconv.Itoa(i)

            w.Add(1)

            go GetAlbum(url)

            w.Wait()

        }

    }

}

func GetAlbum(url string) {

    data := GetUrl(url)

    body := string(data)

    part := regexp.MustCompile(`<a class="img" href="(.*)">`)

    match := part.FindAllStringSubmatch(body, -1)

    for _, v := range match {

        album <- v[1]

        w.Add(1)

        go GetItem()

    }

    w.Done()

}

func GetItem() {

    url := <-album

    defer func() {

        ret := recover()

        if ret != nil {

            log.Println(ret)

            w.Done()

        } else {

            w.Done()

        }

    }()

    data := GetUrl(url)

    if len(data) > 10 {

        body := string(data)

        part := regexp.MustCompile(`bigimgsrc="(.*)"`)

        match := part.FindAllStringSubmatch(body, -1)

        for _, v := range match {

            str := strings.Split(v[1], "/")

            length := len(str)

            source := GetUrl(v[1])

            name := str[length-1]

            file, err := os.Create(dir + name)

            if err != nil {

                panic(err)

            }

            size, err := file.Write(source)

            defer file.Close()

            if err != nil {

                panic(err)

            }

            log.Println(size)

        }

    }

}

func GetUrl(url string) []byte {

    ret, err := http.Get(url)

    if err != nil {

        log.Println(url)

        status := map[string]string{}

        status["status"] = "400"

        status["url"] = url

        panic(status)

    }

    body := ret.Body

    data, _ := ioutil.ReadAll(body)

    return data

}

That's all for this article, and I hope it will be helpful if you are familiar with the go language.