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updater.go
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/
updater.go
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package updater
import (
"context"
"fmt"
"log"
"golang.org/x/sync/errgroup"
"github.com/Alkemic/webrss/feed_fetcher"
"github.com/Alkemic/webrss/repository"
)
type feedRepository interface {
List(ctx context.Context) ([]repository.Feed, error)
}
type webrssService interface {
SaveEntries(ctx context.Context, feedID int64, entries []repository.Entry) error
}
type feedFetcher interface {
Fetch(ctx context.Context, url string) (feed_fetcher.Feed, error)
}
type UpdateService struct {
feedRepository feedRepository
webrssService webrssService
feedFetcher feedFetcher
logger *log.Logger
}
func New(feedRepository feedRepository, webrssService webrssService, feedFetcher feedFetcher, logger *log.Logger) UpdateService {
return UpdateService{
feedRepository: feedRepository,
webrssService: webrssService,
feedFetcher: feedFetcher,
logger: logger,
}
}
func (u UpdateService) Run(ctx context.Context) error {
g, ctx := errgroup.WithContext(ctx)
feeds, err := u.feedRepository.List(ctx)
if err != nil {
return fmt.Errorf("cannot select feeds: %w", err)
}
for _, feed := range feeds {
feed := feed
g.Go(func() error {
feeder, err := u.feedFetcher.Fetch(ctx, feed.FeedUrl)
if err != nil {
u.logger.Printf("error fetching feed %s: %v\n", feed.FeedUrl, err)
return nil
}
entries := feeder.Entries(ctx)
if err := u.webrssService.SaveEntries(ctx, feed.ID, entries); err != nil {
return fmt.Errorf("cannot save entry: %w", err)
}
return nil
})
}
if err := g.Wait(); err != nil {
return fmt.Errorf("got error during processing feeds: %w", err)
}
return nil
}