cache

package

v0.0.0-...-4829b00 Latest Latest Go to latest Published: Nov 16, 2023 License: MIT Imports: 8 Imported by: 0

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Package cache implements dns cache feature with edns-client-subnet support.

This section is empty.

This section is empty.

func Key(q dns.Question, ednsIP string) string

Key creates a hash key from a question section.

type Cache struct {
	sync.RWMutex
	// contains filtered or unexported fields
}

Cache is a cache that holds on the a number of RRs or DNS messages. The cache eviction is randomized.

func New(capacity int, redisUrl string, cacheRedisConnectionPoolSize int) *Cache

New returns a new cache with the capacity and the ttl specified.

func (c *Cache) Capacity() int

func (c *Cache) Dump(nobody bool) (rs map[string][]string, l int)

Dump returns all local dns cache information for debugging

func (c *Cache) EvictRandom()

EvictRandom removes a random member a the cache. Must be called under a write lock.

func (c *Cache) Hit(key string, msgid uint16) *dns.Msg

Hit returns a dns message from the cache. If the message's TTL is expired, nil will be returned and the message is removed from the cache.

func (c *Cache) InsertMessage(s string, m *dns.Msg, mTTL uint32)

InsertMessage inserts a message in the Cache. We will cache it for ttl seconds, which should be a small (60...300) integer.

func (c *Cache) InsertMessageToLocal(s string, m *dns.Msg, mTTL uint32)

func (c *Cache) InsertMessageToRedis(s string, m *dns.Msg, mTTL uint32) error

func (c *Cache) Remove(s string)

func (c *Cache) Search(s string) (*dns.Msg, time.Time, bool)

Search returns a dns.Msg, the expiration time and a boolean indicating if we found something in the cache.

func (c *Cache) SearchFromLocal(s string) (*dns.Msg, time.Time, bool)

todo: use finder implementation

func (c *Cache) SearchFromRedis(s string) (*dns.Msg, time.Time, bool)