Golang mlog.LogInst函数代码示例

func (this *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()
	destReader, err := charset.NewReader(gzipReader, contentTypeStr)

	if err != nil {
		mlog.LogInst().LogError(err.Error())
		destReader = sor
	}

	var sorbody []byte
	if sorbody, err = ioutil.ReadAll(destReader); err != nil {
		mlog.LogInst().LogError(err.Error())
		// For gb2312, an error will be returned.
		// Error like: simplifiedchinese: invalid GBK encoding
		// return ""
	}
	//e,name,certain := charset.DetermineEncoding(sorbody,contentTypeStr)
	bodystr := string(sorbody)

	return bodystr
}

func (this *RedisScheduler) Poll() *request.Request {
	this.locker.Lock()
	defer this.locker.Unlock()

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

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

	requ := &request.Request{}

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

	return requ
}

func (this *HttpDownloader) downloadHtml(req *request.Request) *page.Page {
	var err error
	var url string
	if url = req.GetUrl(); len(url) == 0 {
		return nil
	}

	var resp *http.Response
	if resp, err = http.Get(url); err != nil {
		mlog.LogInst().LogError(err.Error())
		return nil
	}
	defer resp.Body.Close()

	var doc *goquery.Document
	if doc, err = goquery.NewDocumentFromReader(resp.Body); err != nil {
		mlog.LogInst().LogError(err.Error())
		return nil
	}

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

	// create Page
	var p *page.Page = page.NewPage(req).
		SetBodyStr(body).
		SetHtmlParser(doc)

	return p

}

func (this *HttpDownloader) downloadJson(req *request.Request) *page.Page {
	var err error
	var url string
	if url = req.GetUrl(); len(url) == 0 {
		mlog.LogInst().LogError(err.Error())
		return nil
	}

	var resp *http.Response
	if resp, err = http.Get(url); err != nil {
		mlog.LogInst().LogError(err.Error())
		return nil
	}
	defer resp.Body.Close()

	var body []byte
	if body, err = ioutil.ReadAll(resp.Body); err != nil {
		mlog.LogInst().LogError(err.Error())
		return nil
	}

	var r *simplejson.Json
	if r, err = simplejson.NewJson(body); err != nil {
		mlog.LogInst().LogError(err.Error())
		return nil
	}

	// create Page
	// json result
	var p *page.Page = page.NewPage(req).
		SetBodyStr(string(body)).
		SetJson(r)

	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 := spider.NewSpider(proc, "redis_scheduler_example").
		//SetSleepTime("fixed", 6000, 6000).
		//SetScheduler(scheduler.NewQueueScheduler(true)).
		SetScheduler(scheduler.NewRedisScheduler(redisAddr, redisMaxConn, redisMaxIdle, true)).
		AddPipeline(pipeline.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 (this *HttpDownloader) downloadHtml(p *page.Page, req *request.Request) *page.Page {
	var err error
	p, destbody := this.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
}

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

func (this *RedisScheduler) Push(requ *request.Request) {
	this.locker.Lock()
	defer this.locker.Unlock()

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

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

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

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

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

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

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

	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 (this *MyProcessor) Process(p *page.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(urls, "html")

}

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

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

// Download file and change the charset of page charset.
func (this *HttpDownloader) downloadFile(p *page.Page, req *request.Request) (*page.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, ""
	}

	client := &http.Client{
		CheckRedirect: req.GetRedirectFunc(),
	}
	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())
			return p, ""
		}
	}

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

	// get converter to utf-8
	bodyStr := this.changeCharsetEncodingAuto(resp.Header.Get("Content-Type"), resp.Body)

	defer resp.Body.Close()
	return p, bodyStr
}

// core processer
func (this *Spider) pageProcess(req *request.Request) {
	var p *page.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++ {
		this.sleep()
		p = this.pDownloader.Download(req)
		if p.IsSucc() { // if fail retry 3 times
			break
		}

	}

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

	this.pPageProcesser.Process(p)
	for _, req := range p.GetTargetRequests() {
		this.AddRequest(req)
	}

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