Reschedule next check date for rate limited feeds

internal/model/feed.go

@@ -107,7 +107,7 @@ func (f *Feed) CheckedNow() {
 }
 
 // ScheduleNextCheck set "next_check_at" of a feed based on the scheduler selected from the configuration.
-func (f *Feed) ScheduleNextCheck(weeklyCount int, newTTL int) {
+func (f *Feed) ScheduleNextCheck(weeklyCount int, newTTL int, rateLimited bool) {
 	f.TTL = newTTL
 	// Default to the global config Polling Frequency.
 	var intervalMinutes int
@@ -123,6 +123,9 @@ func (f *Feed) ScheduleNextCheck(weeklyCount int, newTTL int) {
 	default:
 		intervalMinutes = config.Opts.SchedulerRoundRobinMinInterval()
 	}
+	if rateLimited {
+		intervalMinutes += (12 * 60)
+	}
 	// If the feed has a TTL defined, we use it to make sure we don't check it too often.
 	if newTTL > intervalMinutes && newTTL > 0 {
 		intervalMinutes = newTTL

internal/model/feed_test.go

@@ -15,6 +15,7 @@ import (
 const (
 	largeWeeklyCount = 10080
 	noNewTTL         = 0
+	noRateLimited    = false
 )
 
 func TestFeedCategorySetter(t *testing.T) {
@@ -89,7 +90,7 @@ func TestFeedScheduleNextCheckDefault(t *testing.T) {
 	timeBefore := time.Now()
 	feed := &Feed{}
 	weeklyCount := 10
-	feed.ScheduleNextCheck(weeklyCount, noNewTTL)
+	feed.ScheduleNextCheck(weeklyCount, noNewTTL, noRateLimited)
 
 	if feed.NextCheckAt.IsZero() {
 		t.Error(`The next_check_at must be set`)
@@ -115,7 +116,7 @@ func TestFeedScheduleNextCheckRoundRobinMinInterval(t *testing.T) {
 	timeBefore := time.Now()
 	feed := &Feed{}
 	weeklyCount := 100
-	feed.ScheduleNextCheck(weeklyCount, noNewTTL)
+	feed.ScheduleNextCheck(weeklyCount, noNewTTL, noRateLimited)
 
 	if feed.NextCheckAt.IsZero() {
 		t.Error(`The next_check_at must be set`)
@@ -144,7 +145,7 @@ func TestFeedScheduleNextCheckEntryFrequencyMaxInterval(t *testing.T) {
 	feed := &Feed{}
 	// Use a very small weekly count to trigger the max interval
 	weeklyCount := 1
-	feed.ScheduleNextCheck(weeklyCount, noNewTTL)
+	feed.ScheduleNextCheck(weeklyCount, noNewTTL, noRateLimited)
 
 	if feed.NextCheckAt.IsZero() {
 		t.Error(`The next_check_at must be set`)
@@ -173,7 +174,7 @@ func TestFeedScheduleNextCheckEntryFrequencyMaxIntervalZeroWeeklyCount(t *testin
 	feed := &Feed{}
 	// Use a very small weekly count to trigger the max interval
 	weeklyCount := 0
-	feed.ScheduleNextCheck(weeklyCount, noNewTTL)
+	feed.ScheduleNextCheck(weeklyCount, noNewTTL, noRateLimited)
 
 	if feed.NextCheckAt.IsZero() {
 		t.Error(`The next_check_at must be set`)
@@ -202,7 +203,7 @@ func TestFeedScheduleNextCheckEntryFrequencyMinInterval(t *testing.T) {
 	feed := &Feed{}
 	// Use a very large weekly count to trigger the min interval
 	weeklyCount := largeWeeklyCount
-	feed.ScheduleNextCheck(weeklyCount, noNewTTL)
+	feed.ScheduleNextCheck(weeklyCount, noNewTTL, noRateLimited)
 
 	if feed.NextCheckAt.IsZero() {
 		t.Error(`The next_check_at must be set`)
@@ -228,7 +229,7 @@ func TestFeedScheduleNextCheckEntryFrequencyFactor(t *testing.T) {
 	timeBefore := time.Now()
 	feed := &Feed{}
 	weeklyCount := 7
-	feed.ScheduleNextCheck(weeklyCount, noNewTTL)
+	feed.ScheduleNextCheck(weeklyCount, noNewTTL, noRateLimited)
 
 	if feed.NextCheckAt.IsZero() {
 		t.Error(`The next_check_at must be set`)
@@ -260,7 +261,7 @@ func TestFeedScheduleNextCheckEntryFrequencySmallNewTTL(t *testing.T) {
 	weeklyCount := largeWeeklyCount
 	// TTL is smaller than minInterval.
 	newTTL := minInterval / 2
-	feed.ScheduleNextCheck(weeklyCount, newTTL)
+	feed.ScheduleNextCheck(weeklyCount, newTTL, noRateLimited)
 
 	if feed.NextCheckAt.IsZero() {
 		t.Error(`The next_check_at must be set`)
@@ -296,7 +297,7 @@ func TestFeedScheduleNextCheckEntryFrequencyLargeNewTTL(t *testing.T) {
 	weeklyCount := largeWeeklyCount
 	// TTL is larger than minInterval.
 	newTTL := minInterval * 2
-	feed.ScheduleNextCheck(weeklyCount, newTTL)
+	feed.ScheduleNextCheck(weeklyCount, newTTL, noRateLimited)
 
 	if feed.NextCheckAt.IsZero() {
 		t.Error(`The next_check_at must be set`)
@@ -309,3 +310,25 @@ func TestFeedScheduleNextCheckEntryFrequencyLargeNewTTL(t *testing.T) {
 		t.Error(`The next_check_at should be after timeBefore + entry frequency min interval`)
 	}
 }
+
+func TestFeedScheduleNextCheckRateLimited(t *testing.T) {
+	var err error
+	parser := config.NewParser()
+	config.Opts, err = parser.ParseEnvironmentVariables()
+	if err != nil {
+		t.Fatalf(`Parsing failure: %v`, err)
+	}
+
+	feed := &Feed{}
+	weeklyCount := 10
+	rateLimited := true
+	feed.ScheduleNextCheck(weeklyCount, noNewTTL, rateLimited)
+
+	if feed.NextCheckAt.IsZero() {
+		t.Error(`The next_check_at must be set`)
+	}
+
+	if feed.NextCheckAt.Before(time.Now().Add(time.Minute * time.Duration(60*12))) {
+		t.Error(`The next_check_at should not be before the now + 12 hours`)
+	}
+}

internal/reader/fetcher/response_handler.go

@@ -63,6 +63,10 @@ func (r *ResponseHandler) IsModified(lastEtagValue, lastModifiedValue string) bo
 	return true
 }
 
+func (r *ResponseHandler) IsRateLimited() bool {
+	return r.httpResponse.StatusCode == http.StatusTooManyRequests
+}
+
 func (r *ResponseHandler) Close() {
 	if r.httpResponse != nil && r.httpResponse.Body != nil && r.clientErr == nil {
 		r.httpResponse.Body.Close()

internal/reader/handler/handler.go

@@ -218,6 +218,7 @@ func RefreshFeed(store *storage.Storage, userID, feedID int64, forceRefresh bool
 
 	weeklyEntryCount := 0
 	newTTL := 0
+	rateLimited := false
 	if config.Opts.PollingScheduler() == model.SchedulerEntryFrequency {
 		var weeklyCountErr error
 		weeklyEntryCount, weeklyCountErr = store.WeeklyFeedEntryCount(userID, feedID)
@@ -230,12 +231,13 @@ func RefreshFeed(store *storage.Storage, userID, feedID int64, forceRefresh bool
 	// Commit the result to the database at the end of this function.
 	// If we met an error before entering the defer function, localizedError would not be nil.
 	defer func() {
-		originalFeed.ScheduleNextCheck(weeklyEntryCount, newTTL)
+		originalFeed.ScheduleNextCheck(weeklyEntryCount, newTTL, rateLimited)
 		slog.Debug("Updated next check date",
 			slog.Int64("user_id", userID),
 			slog.Int64("feed_id", feedID),
 			slog.Int("weeklyEntryCount", weeklyEntryCount),
 			slog.Int("ttl", newTTL),
+			slog.Bool("rateLimited", rateLimited),
 			slog.Time("new_next_check_at", originalFeed.NextCheckAt),
 		)
 		if localizedError == nil {
@@ -266,6 +268,11 @@ func RefreshFeed(store *storage.Storage, userID, feedID int64, forceRefresh bool
 	responseHandler := fetcher.NewResponseHandler(requestBuilder.ExecuteRequest(originalFeed.FeedURL))
 	defer responseHandler.Close()
 
+	rateLimited = responseHandler.IsRateLimited()
+	if rateLimited {
+		slog.Warn("Feed is rate limited (429 status code)", slog.String("feed_url", originalFeed.FeedURL))
+	}
+
 	if localizedError = responseHandler.LocalizedError(); localizedError != nil {
 		slog.Warn("Unable to fetch feed", slog.String("feed_url", originalFeed.FeedURL), slog.Any("error", localizedError.Error()))
 		return localizedError