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rewrite crawler

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This commit is contained in:
Nazar Kanaev 2021-03-23 15:14:58 +00:00
parent 646519e074
commit 9ede816078
1 changed files with 18 additions and 10 deletions
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28
src/worker/crawler.go
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@ -14,6 +14,7 @@ import (
"github.com/nkanaev/yarr/src/crawler"
feedparser "github.com/nkanaev/yarr/src/feed"
"github.com/nkanaev/yarr/src/storage"
"golang.org/x/net/html/charset"
)
type FeedSource struct {
@ -41,8 +42,12 @@ func (c *Client) getConditional(url, lastModified, etag string) (*http.Response,
return nil, err
}
req.Header.Set("User-Agent", c.userAgent)
req.Header.Set("If-Modified-Since", lastModified)
req.Header.Set("If-None-Match", etag)
if lastModified != "" {
req.Header.Set("If-Modified-Since", lastModified)
}
if etag != "" {
req.Header.Set("If-None-Match", etag)
}
return c.httpClient.Do(req)
}
@ -215,29 +220,32 @@ func listItems(f storage.Feed, db *storage.Storage) ([]storage.Item, error) {
}
if err != nil {
return nil, err
return nil, fmt.Errorf("unable to get: %s", err)
}
defer res.Body.Close()
if res.StatusCode/100 == 4 || res.StatusCode/100 == 5 {
errmsg := fmt.Sprintf("Failed to list feed items for %s (status: %d)", f.FeedLink, res.StatusCode)
return nil, errors.New(errmsg)
return nil, fmt.Errorf("status code %d", res.StatusCode)
}
if res.StatusCode == 304 {
return nil, nil
}
body, err := charset.NewReader(res.Body, res.Header.Get("Content-Type"))
if err != nil {
return nil, fmt.Errorf("failed to init response body: %s", err)
}
feed, err := feedparser.Parse(body)
if err != nil {
return nil, fmt.Errorf("failed to parse: %s", err)
}
lastModified := res.Header.Get("Last-Modified")
etag := res.Header.Get("Etag")
if lastModified != "" || etag != "" {
db.SetHTTPState(f.Id, lastModified, etag)
}
feed, err := feedparser.Parse(res.Body)
if err != nil {
return nil, err
}
return ConvertItems(feed.Items, f), nil
}