func (self *HttpDownloader) downloadHtml(p *robot.Page, req *robot.Request) *robot.Page {
	var err error
	p, destbody := self.downloadFile(p, req)
	//fmt.Printf("Destbody %v \r\n", destbody)
	if !p.IsSucc() {
		//fmt.Print("Page error \r\n")
		return p
	}
	bodyReader := bytes.NewReader([]byte(destbody))

	var doc *goquery.Document
	if doc, err = goquery.NewDocumentFromReader(bodyReader); err != nil {
		mlog.LogInst().LogError(err.Error())
		p.SetStatus(true, err.Error())
		return p
	}

	var body string
	if body, err = doc.Html(); err != nil {
		mlog.LogInst().LogError(err.Error())
		p.SetStatus(true, err.Error())
		return p
	}

	p.SetBodyStr(body).SetHtmlParser(doc).SetStatus(false, "")

	return p
}

func main() {
	start_url := "http://www.jiexieyin.org"
	thread_num := uint(16)

	redisAddr := "127.0.0.1:6379"
	redisMaxConn := 10
	redisMaxIdle := 10

	proc := &MyProcessor{}

	sp := robot.NewSpider(proc, "redis_scheduler_example").
		//SetSleepTime("fixed", 6000, 6000).
		//SetScheduler(scheduler.NewQueueScheduler(true)).
		SetScheduler(robot.NewRedisScheduler(redisAddr, redisMaxConn, redisMaxIdle, true)).
		AddPipeline(robot.NewPipelineConsole()).
		SetThreadnum(thread_num)

	init := false
	for _, arg := range os.Args {
		if arg == "--init" {
			init = true
			break
		}
	}
	if init {
		sp.AddUrl(start_url, "html")
		mlog.LogInst().LogInfo("重新开始爬")
	} else {
		mlog.LogInst().LogInfo("继续爬")
	}
	sp.Run()
}

func (self *RedisScheduler) Poll() *robot.Request {
	conn := self.redisPool.Get()
	defer conn.Close()

	length, err := self.count()
	if err != nil {
		return nil
	}
	if length <= 0 {
		mlog.LogInst().LogError("RedisScheduler Poll length 0")
		return nil
	}
	buf, err := conn.Do("LPOP", self.requestList)
	if err != nil {
		mlog.LogInst().LogError("RedisScheduler Poll Error: " + err.Error())
		return nil
	}

	requ := &robot.Request{}

	err = json.Unmarshal(buf.([]byte), requ)
	if err != nil {
		mlog.LogInst().LogError("RedisScheduler Poll Error: " + err.Error())
		return nil
	}

	return requ
}

// add Request to Schedule
func (self *Spider) AddRequest(req *Request) *Spider {
	if req == nil {
		mlog.LogInst().LogError("request is nil")
		return self
	} else if req.GetUrl() == "" {
		mlog.LogInst().LogError("request is empty")
		return self
	}
	self.scheduler.Push(req)
	return self
}

func (self *MyProcessor) Process(p *robot.Page) {
	if !p.IsSucc() {
		mlog.LogInst().LogError(p.Errormsg())
		return
	}

	u, err := url.Parse(p.GetRequest().GetUrl())
	if err != nil {
		mlog.LogInst().LogError(err.Error())
		return
	}
	if !strings.HasSuffix(u.Host, "jiexieyin.org") {
		return
	}

	var urls []string
	query := p.GetHtmlParser()

	query.Find("a").Each(func(i int, s *goquery.Selection) {
		href, _ := s.Attr("href")
		reJavascript := regexp.MustCompile("^javascript\\:")
		reLocal := regexp.MustCompile("^\\#")
		reMailto := regexp.MustCompile("^mailto\\:")
		if reJavascript.MatchString(href) || reLocal.MatchString(href) || reMailto.MatchString(href) {
			return
		}

		//处理相对路径
		var absHref string
		urlHref, err := url.Parse(href)
		if err != nil {
			mlog.LogInst().LogError(err.Error())
			return
		}
		if !urlHref.IsAbs() {
			urlPrefix := p.GetRequest().GetUrl()
			absHref = urlPrefix + href
			urls = append(urls, absHref)
		} else {
			urls = append(urls, href)
		}

	})

	p.AddTargetRequests(initrequests(urls))
	p.AddField("test1", p.GetRequest().GetUrl())
	p.AddField("test2", p.GetRequest().GetUrl())
}

// choose http GET/method to download
func connectByHttp(p *robot.Page, req *robot.Request) (*http.Response, error) {
	client := &http.Client{}

	httpreq, err := http.NewRequest(req.GetMethod(), req.GetUrl(), strings.NewReader(req.GetPostdata()))
	if header := req.GetHeader(); header != nil {
		httpreq.Header = req.GetHeader()
	}

	if cookies := req.GetCookies(); cookies != nil {
		for i := range cookies {
			httpreq.AddCookie(cookies[i])
		}
	}

	var resp *http.Response
	if resp, err = client.Do(httpreq); err != nil {
		if e, ok := err.(*url.Error); ok && e.Err != nil && e.Err.Error() == "normal" {
			//  normal
		} else {
			mlog.LogInst().LogError(err.Error())
			p.SetStatus(true, err.Error())
			//fmt.Printf("client do error %v \r\n", err)
			return nil, err
		}
	}

	return resp, nil
}

func (self *HttpDownloader) downloadJson(p *robot.Page, req *robot.Request) *robot.Page {
	var err error
	p, destbody := self.downloadFile(p, req)
	if !p.IsSucc() {
		return p
	}

	var body []byte
	body = []byte(destbody)
	mtype := req.GetResponceType()
	if mtype == "jsonp" {
		tmpstr := goutils.JsonpToJson(destbody)
		body = []byte(tmpstr)
	}

	var r *simplejson.Json
	if r, err = simplejson.NewJson(body); err != nil {
		mlog.LogInst().LogError(string(body) + "\t" + err.Error())
		p.SetStatus(true, err.Error())
		return p
	}

	// json result
	p.SetBodyStr(string(body)).SetJson(r).SetStatus(false, "")

	return p
}

func main() {
	start_url := "http://www.jiexieyin.org"
	redisAddr := "127.0.0.1:6379"
	redisMaxConn := 10
	redisMaxIdle := 10

	mongoUrl := "localhost:27017"
	mongoDB := "test"
	mongoCollection := "test"

	scheduleroptions := scheduler.RedisSchedulerOptions{
		RequestList:           "mgospider_requests",
		UrlList:               "mgospider_urls",
		RedisAddr:             redisAddr,
		MaxConn:               redisMaxConn,
		MaxIdle:               redisMaxIdle,
		ForbiddenDuplicateUrl: false,
	}

	//爬虫初始化
	options := robot.SpiderOptions{
		TaskName:      "mgospider",
		PageProcesser: NewMyProcesser(),
		Downloader:    downloader.NewHttpDownloader("text/html; charset=gb2312"),
		Scheduler:     scheduler.NewRedisScheduler(scheduleroptions),
		Pipelines:     []robot.Pipeline{NewPipelineMongo(mongoUrl, mongoDB, mongoCollection)},
		//设置资源管理器，资源池容量为10
		ResourceManage: resource.NewSpidersPool(10, nil),
	}

	sp := robot.NewSpider(options)

	init := false
	for _, arg := range os.Args {
		if arg == "--init" {
			init = true
			break
		}
	}
	if init {
		sp.AddRequest(initrequest(start_url))
		mlog.LogInst().LogInfo("重新开始爬")
	} else {
		mlog.LogInst().LogInfo("继续爬")
	}
	sp.Run()
}

// Charset auto determine. Use golang.org/x/net/html/charset. Get page body and change it to utf-8
// 自动转码
func (self *HttpDownloader) changeCharsetEncodingAuto(contentTypeStr string, sor io.ReadCloser) string {
	if len(strings.Split(contentTypeStr, " ")) < 2 {
		contentTypeStr = self.DefaultContentType
	}
	destReader, err := charset.NewReader(sor, contentTypeStr)
	if err != nil {
		mlog.LogInst().LogError(err.Error())
		destReader = sor
	}
	var sorbody []byte
	sorbody, err = ioutil.ReadAll(destReader)
	if err != nil {
		mlog.LogInst().LogError(err.Error())
	}
	bodystr := string(sorbody)
	return bodystr
}

func (self *RedisScheduler) Push(requ *robot.Request) {
	requJson, err := json.Marshal(requ)
	if err != nil {
		mlog.LogInst().LogError("RedisScheduler Push Error: " + err.Error())
		return
	}

	conn := self.redisPool.Get()
	defer conn.Close()

	if err != nil {
		mlog.LogInst().LogError("RedisScheduler Push Error: " + err.Error())
		return
	}
	if self.forbiddenDuplicateUrl {
		urlExist, err := conn.Do("HGET", self.urlList, requ.GetUrl())
		if err != nil {
			mlog.LogInst().LogError("RedisScheduler Push Error: " + err.Error())
			return
		}
		if urlExist != nil {
			return
		}
		conn.Do("MULTI")
		_, err = conn.Do("HSET", self.urlList, requ.GetUrl(), 1)
		if err != nil {
			mlog.LogInst().LogError("RedisScheduler Push Error: " + err.Error())
			conn.Do("DISCARD")
			return
		}
	}
	_, err = conn.Do("RPUSH", self.requestList, requJson)
	if err != nil {
		mlog.LogInst().LogError("RedisScheduler Push Error: " + err.Error())
		if self.forbiddenDuplicateUrl {
			conn.Do("DISCARD")
		}
		return
	}

	if self.forbiddenDuplicateUrl {
		conn.Do("EXEC")
	}
}

func (self *HttpDownloader) changeCharsetEncodingAutoGzipSupport(contentTypeStr string, sor io.ReadCloser) string {
	var err error
	gzipReader, err := gzip.NewReader(sor)
	if err != nil {
		mlog.LogInst().LogError(err.Error())
		return ""
	}
	defer gzipReader.Close()
	return self.changeCharsetEncodingAuto(contentTypeStr, gzipReader)
}

// GetHtmlParser returns goquery object binded to target crawl result.
func (self *Page) ResetHtmlParser() *goquery.Document {
	r := strings.NewReader(self.body)
	var err error
	self.docParser, err = goquery.NewDocumentFromReader(r)
	if err != nil {
		mlog.LogInst().LogError(err.Error())
		panic(err.Error())
	}
	return self.docParser
}

func (self *RedisScheduler) count() (int, error) {
	conn := self.redisPool.Get()
	defer conn.Close()
	length, err := conn.Do("LLEN", self.requestList)
	if err != nil {
		mlog.LogInst().LogError("RedisScheduler Count Error: " + err.Error())
		return 0, err
	}
	return int(length.(int64)), nil
}

// core processer
func (self *Spider) pageProcess(req *Request) {
	var p *Page

	defer func() {
		if err := recover(); err != nil { // do not affect other
			if strerr, ok := err.(string); ok {
				mlog.LogInst().LogError(strerr)
			} else {
				mlog.LogInst().LogError("pageProcess error")
			}
		}
	}()

	// download page
	for i := 0; i < 3; i++ {
		self.sleep()
		p = self.downloader.Download(req)
		if p.IsSucc() { // if fail retry 3 times
			break
		}

	}

	if !p.IsSucc() { // if fail do not need process
		return
	}

	self.pageProcesser.Process(p)
	//将targetRequests中的所有请求列表放入调度队列
	for _, req := range p.GetTargetRequests() {
		self.AddRequest(req)
	}

	// output
	if !p.GetSkip() {
		for _, pip := range self.pipelines {
			//fmt.Println("%v",p.GetPageItems().GetAll())
			pip.Process(p.GetPageItems(), self)
		}
	}
}

func NewRequest(req *Request) *Request {
	//主要做默认值设置与错误检测
	if req.Url == "" {
		mlog.LogInst().LogError("request url is nil")
	}
	if req.Method == "" || req.Method != "GET" || req.Method != "POST" || req.Method != "HEAD" || req.Method != "OPTIONS" || req.Method != "PUT" || req.Method != "DELETE" {
		req.Method = "GET"
	}
	if req.RespType == "" || req.RespType != "html" || req.RespType != "json" || req.RespType != "jsonp" || req.RespType != "text" {
		req.RespType = "html"
	}
	return req
}

func (self *Www79xsComProcessor) Process(p *robot.Page) {
	//判断页面是否抓取成功
	if !p.IsSucc() {
		mlog.LogInst().LogError(p.Errormsg())
		return
	}

	//如果callback为空，则说明是入口页面，否则直接执行对应callback
	callback := p.GetRequest().GetCallBack()
	if callback == nil {
		self.mainParse(p)
	} else {
		callback(p)
	}
}

func (self *HttpDownloader) Download(req *robot.Request) *robot.Page {
	var mtype string
	var p = robot.NewPage(req)
	mtype = req.GetResponceType()
	switch mtype {
	case "html":
		return self.downloadHtml(p, req)
	case "json":
		fallthrough
	case "jsonp":
		return self.downloadJson(p, req)
	case "text":
		return self.downloadText(p, req)
	default:
		mlog.LogInst().LogError("error request type:" + mtype)
	}
	return p
}

func ReadHeaderFromFile(headerFile string) http.Header {
	//read file , parse the header and cookies
	b, err := ioutil.ReadFile(headerFile)
	if err != nil {
		//make be:  share access error
		mlog.LogInst().LogError(err.Error())
		return nil
	}
	js, _ := simplejson.NewJson(b)
	//constructed to header

	h := make(http.Header)
	h.Add("User-Agent", js.Get("User-Agent").MustString())
	h.Add("Referer", js.Get("Referer").MustString())
	h.Add("Cookie", js.Get("Cookie").MustString())
	h.Add("Cache-Control", "max-age=0")
	h.Add("Connection", "keep-alive")
	return h
}

// Download file and change the charset of page charset.
func (self *HttpDownloader) downloadFile(p *robot.Page, req *robot.Request) (*robot.Page, string) {
	var err error
	var urlstr string
	if urlstr = req.GetUrl(); len(urlstr) == 0 {
		mlog.LogInst().LogError("url is empty")
		p.SetStatus(true, "url is empty")
		return p, ""
	}

	var resp *http.Response

	if proxystr := req.GetProxyHost(); len(proxystr) != 0 {
		//using http proxy
		//fmt.Print("HttpProxy Enter ",proxystr,"\n")
		resp, err = connectByHttpProxy(p, req)
	} else {
		//normal http download
		//fmt.Print("Http Normal Enter \n",proxystr,"\n")
		resp, err = connectByHttp(p, req)
	}

	if err != nil {
		return p, ""
	}

	p.SetHeader(resp.Header)
	p.SetCookies(resp.Cookies())

	// get converter to utf-8
	var bodyStr string
	if resp.Header.Get("Content-Encoding") == "gzip" {
		bodyStr = self.changeCharsetEncodingAutoGzipSupport(resp.Header.Get("Content-Type"), resp.Body)
	} else {
		bodyStr = self.changeCharsetEncodingAuto(resp.Header.Get("Content-Type"), resp.Body)
	}
	//fmt.Printf("utf-8 body %v \r\n", bodyStr)
	defer resp.Body.Close()
	return p, bodyStr
}