package feed import ( "fmt" "io" "os/exec" "github.com/Necoro/gofeed" "github.com/google/uuid" "github.com/Necoro/feed2imap-go/internal/http" ) func (feed *Feed) Parse() error { fp := gofeed.NewParser() var reader io.Reader var cleanup func() error if feed.Url != "" { // we do not use the http support in gofeed, so that we can control the behavior of http requests // and ensure it to be the same in all places resp, cancel, err := http.Get(feed.Url, feed.Context()) if err != nil { return fmt.Errorf("while fetching %s from %s: %w", feed.Name, feed.Url, err) } defer cancel() // includes resp.Body.Close reader = resp.Body cleanup = func() error { return nil } } else { // exec // we use the same context as for HTTP ctx, cancel := feed.Context().StdContext() cmd := exec.CommandContext(ctx, feed.Exec[0], feed.Exec[1:]...) defer func() { cancel() // cmd.Wait might have already been called -- but call it again to be sure _ = cmd.Wait() }() stdout, err := cmd.StdoutPipe() if err != nil { return fmt.Errorf("preparing exec for feed '%s': %w", feed.Name, err) } if err = cmd.Start(); err != nil { return fmt.Errorf("starting exec for feed '%s: %w", feed.Name, err) } reader = stdout cleanup = cmd.Wait } parsedFeed, err := fp.Parse(reader) if err != nil { return fmt.Errorf("parsing feed '%s': %w", feed.Name, err) } feed.feed = parsedFeed feed.items = make([]Item, len(parsedFeed.Items)) for idx, feedItem := range parsedFeed.Items { feed.items[idx] = Item{Feed: parsedFeed, feed: feed, Item: feedItem, ID: uuid.New()} } return cleanup() }