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feat: use Cache-Control max-age and Expires headers to calculate next check

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This commit is contained in:
Frédéric Guillot 2025-04-06 16:18:41 -07:00
parent 0af1a6e121
commit c45b51d1f8
3 changed files with 110 additions and 2 deletions
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12
internal/reader/handler/handler.go
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@ -301,8 +301,12 @@ func RefreshFeed(store *storage.Storage, userID, feedID int64, forceRefresh bool
return localizedError
}
// If the feed has a TTL defined, we use it to make sure we don't check it too often.
refreshDelayInMinutes = updatedFeed.TTL
// Use the RSS TTL value, or the Cache-Control or Expires HTTP headers if available.
// Otherwise, we use the default value from the configuration (min interval parameter).
feedTTLValue := updatedFeed.TTL
cacheControlMaxAgeValue := responseHandler.CacheControlMaxAgeInMinutes()
expiresValue := responseHandler.ExpiresInMinutes()
refreshDelayInMinutes = max(feedTTLValue, cacheControlMaxAgeValue, expiresValue)
// Set the next check at with updated arguments.
originalFeed.ScheduleNextCheck(weeklyEntryCount, refreshDelayInMinutes)
@ -310,6 +314,10 @@ func RefreshFeed(store *storage.Storage, userID, feedID int64, forceRefresh bool
slog.Debug("Updated next check date",
slog.Int64("user_id", userID),
slog.Int64("feed_id", feedID),
slog.String("feed_url", originalFeed.FeedURL),
slog.Int("feed_ttl_minutes", feedTTLValue),
slog.Int("cache_control_max_age_in_minutes", cacheControlMaxAgeValue),
slog.Int("expires_in_minutes", expiresValue),
slog.Int("refresh_delay_in_minutes", refreshDelayInMinutes),
slog.Time("new_next_check_at", originalFeed.NextCheckAt),
)