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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.Global.Timeout, feed.NoTLS)
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 := http.Context(feed.Global.Timeout)
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()
}
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