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scrapper.go
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scrapper.go
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package scrapper
import (
"github.com/go-rod/rod"
"github.com/go-rod/rod/lib/input"
)
type Scrapper struct {
browser *rod.Browser
page *rod.Page
}
func New() *Scrapper {
return &Scrapper{
browser: rod.New().MustConnect(),
}
}
func (s Scrapper) GoPage(url string) *Scrapper {
// TODO: only wait once
s.page = s.browser.MustPage(url).MustWaitLoad()
return &s
}
func (s Scrapper) ElementsByPattern(selector string, pattern string) rod.Elements {
return s.page.MustElement(selector).MustWaitLoad().MustElements(pattern)
}
func (s Scrapper) DynamicElementsByPattern(selector string, pattern string) rod.Elements {
return s.page.MustElement(selector).
MustWaitLoad().
MustPress(input.ArrowDown).
MustWaitLoad().
MustElements(pattern)
}
func (s Scrapper) Click(selector string) {
if s.exists(selector) {
s.page.MustElement(selector).MustElement("*").MustClick()
}
}
func (s Scrapper) Text(selector string) string {
if s.exists(selector) {
return s.page.MustElement(selector).MustText()
}
return ""
}
func (s Scrapper) Elements(selector string) rod.Elements {
return s.page.MustElements(selector)
}
// TODO: improve the way to check existence
func (s Scrapper) exists(selector string) bool {
elements, err := s.page.Elements(selector)
return len(elements) > 0 || err != nil
}
func (s Scrapper) Close() {
s.browser.MustClose()
}