示例#1
0
func (self *Downloader) Start(threadNum int) {
	self.requests = make([]*Request, threadNum)

	for i := 0; i < threadNum; i++ {
		request := NewRequest()
		self.requests[i] = request
		self.requests[i].SetDelegate(self)
	}

	for i := 0; i < threadNum; i++ {
		go func(index int, retryMaxCount int) {
			var urlStr string

			for {
				elem := self.scheduler.ShiftElementItem()

				if elem != nil {
					elemItem := elem.(common.ElementItem)
					urlStr = elemItem.UrlStr

					req, res, err := self.requests[index].Init(urlStr).Request()

					if err != nil {
						if elemItem.FaildCount < retryMaxCount {
							elemItem.FaildCount += 1
							self.scheduler.AddElementItem(elemItem, true)
						}
					} else {
						params := make([]interface{}, 0)
						page := common.NewPage(req, res)
						self.process.Do(page)

						res.Body.Close()

						items, elems := page.GetAll()

						for _, v := range elems {
							self.scheduler.AddElementItem(v, false)
						}

						for _, v := range items {
							params = append(params, v)
						}

						self.pipeliner.CallMiddlewareMethod("GetItems", params)
					}

					Threads <- index

				} else {
					time.Sleep(self.sleepTime)
				}
			}

		}(i, retryMaxCount)
	}
}
示例#2
0
func (self *Request) Request() (*common.Page, error) {
	var err interface{} = nil
	body := &strings.Reader{}

	values := url.Values{}

	if len(self.params) > 0 {
		params := self.params

		for v, k := range params {
			values.Add(v, k)
		}

		body = strings.NewReader(values.Encode())
	}

	req, reqError := http.NewRequest("GET", self.urlStr, body)

	var page *common.Page = nil

	if reqError == nil {
		requestError := sErr.RequestError{-1, false}
		self.delegate.CallMiddlewareMethod("SetRequest", []interface{}{req, &requestError})

		if requestError.Exist {
			err = requestError
		}

		res, resError := self.client.Do(req)

		if resError == nil {
			responseError := sErr.ResponseError{false}
			page := common.NewPage(req, res)
			self.delegate.CallMiddlewareMethod("GetResponse", []interface{}{page, &responseError})

			if responseError.Exist {
				err = responseError
			} else if res.StatusCode == 200 {
				return page, nil
			} else {
				err = sErr.RequestError{res.StatusCode, true}
			}
		} else {
			err = resError
		}
	} else {
		err = reqError
	}

	self.delegate.CallMiddlewareMethod("Error", []interface{}{self.client, err})

	return page, err.(error)
}