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fetch.go
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/
fetch.go
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package html
import (
"context"
"errors"
"fmt"
"net/http"
"golang.org/x/net/html"
)
var ErrHTTPStatusCodeNotOK = errors.New("HTTP status code is not OK")
func Fetch(ctx context.Context, client *http.Client, url string) (
rootNode *html.Node, err error) {
request, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
if err != nil {
return nil, fmt.Errorf("creating HTTP request: %w", err)
}
response, err := client.Do(request)
if err != nil {
return nil, err
}
if response.StatusCode != http.StatusOK {
return nil, fmt.Errorf("%w: %d %s", ErrHTTPStatusCodeNotOK,
response.StatusCode, response.Status)
}
rootNode, err = html.Parse(response.Body)
if err != nil {
_ = response.Body.Close()
return nil, fmt.Errorf("parsing HTML code: %w", err)
}
err = response.Body.Close()
if err != nil {
return nil, fmt.Errorf("closing response body: %w", err)
}
return rootNode, nil
}