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feed_group.go
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feed_group.go
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package scheduler
import (
"context"
"encoding/json"
"errors"
"time"
log "github.com/sirupsen/logrus"
"github.com/khulnasoft-lab/package-feeds/pkg/feeds"
"github.com/khulnasoft-lab/package-feeds/pkg/publisher"
)
var (
errPoll = errors.New("error when polling for packages")
errPub = errors.New("error when publishing packages")
)
type feedEntry struct {
feed feeds.ScheduledFeed
lastPoll time.Time
}
type FeedGroup struct {
feeds []*feedEntry
publisher publisher.Publisher
initialCutoff time.Time
}
type groupResult struct {
numPublished int
pollErr error
pubErr error
}
//nolint:lll
func NewFeedGroup(scheduledFeeds []feeds.ScheduledFeed, pub publisher.Publisher, initialCutoff time.Duration) *FeedGroup {
fg := &FeedGroup{
publisher: pub,
initialCutoff: time.Now().UTC().Add(-initialCutoff),
feeds: make([]*feedEntry, 0),
}
for _, feed := range scheduledFeeds {
fg.AddFeed(feed)
}
return fg
}
func (fg *FeedGroup) AddFeed(feed feeds.ScheduledFeed) {
fg.feeds = append(fg.feeds, &feedEntry{
feed: feed,
lastPoll: fg.initialCutoff,
})
}
func (fg *FeedGroup) Run() {
result := fg.pollAndPublish()
if result.pollErr != nil {
log.Error(result.pollErr)
}
if result.pubErr != nil {
log.Error(result.pubErr)
}
}
func (fg *FeedGroup) pollAndPublish() groupResult {
result := groupResult{}
pkgs, err := fg.poll()
result.pollErr = err
// Return early if no packages to process
if len(pkgs) == 0 {
return result
}
log.WithField("num_packages", len(pkgs)).Printf("Publishing packages...")
result.numPublished, result.pubErr = fg.publishPackages(pkgs)
if result.numPublished > 0 {
log.WithField("num_packages", result.numPublished).Printf("Successfully published packages")
}
return result
}
// Poll fetches the latest packages from each registered feed.
func (fg *FeedGroup) poll() ([]*feeds.Package, error) {
results := make(chan pollResult, len(fg.feeds))
for _, f := range fg.feeds {
go func(f *feedEntry) {
result := pollResult{
name: f.feed.GetName(),
feed: f.feed,
}
result.packages, f.lastPoll, result.errs = f.feed.Latest(f.lastPoll)
results <- result
}(f)
}
errs := []error{}
packages := []*feeds.Package{}
for i := 0; i < len(fg.feeds); i++ {
result := <-results
logger := log.WithField("feed", result.name)
for _, err := range result.errs {
logger.WithError(err).Error("Error fetching packages")
errs = append(errs, err)
}
for _, pkg := range result.packages {
log.WithFields(log.Fields{
"feed": result.name,
"name": pkg.Name,
"version": pkg.Version,
}).Print("Processing Package")
}
packages = append(packages, result.packages...)
logger.WithField("num_processed", len(result.packages)).Print("Packages successfully processed")
}
err := errPoll
if len(errs) == 0 {
err = nil
}
log.WithField("time", time.Now().UTC()).Printf("%d packages processed", len(packages))
return packages, err
}
func (fg *FeedGroup) publishPackages(pkgs []*feeds.Package) (int, error) {
processed := 0
errs := []error{}
for _, pkg := range pkgs {
log.WithFields(log.Fields{
"name": pkg.Name,
"feed": pkg.Type,
"created_date": pkg.CreatedDate,
}).Print("Sending package upstream")
b, err := json.Marshal(pkg)
if err != nil {
log.WithField("name", pkg.Name).WithError(err).Error("Error marshaling package")
errs = append(errs, err)
}
if err := (fg.publisher).Send(context.Background(), b); err != nil {
log.WithField("name", pkg.Name).WithError(err).Error("Error sending package to upstream publisher")
errs = append(errs, err)
}
processed++
}
err := errPub
if len(errs) == 0 {
err = nil
}
if len(pkgs)-processed != 0 {
log.Errorf("Failed to publish %v packages", len(pkgs)-processed)
}
return processed, err
}