package cache

import "github.com/skynetservices/skydns/cache"

Index ¶

• func Key(q dns.Question, dnssec, tcp bool) string
• func KeyRRset(rrs []dns.RR) string
• type Cache
• func New(capacity, ttl int) *Cache
• func (c *Cache) Capacity() int
• func (c *Cache) EvictRandom()
• func (c *Cache) Hit(question dns.Question, dnssec, tcp bool, msgid uint16) *dns.Msg
• func (c *Cache) InsertMessage(s string, msg *dns.Msg)
• func (c *Cache) InsertSignature(s string, sig *dns.RRSIG)
• func (c *Cache) Remove(s string)
• func (c *Cache) Search(s string) (*dns.Msg, time.Time, bool)

Functions ¶

func Key ¶

func Key(q dns.Question, dnssec, tcp bool) string

Key creates a hash key from a question section. It creates a different key for requests with DNSSEC.

func KeyRRset ¶

func KeyRRset(rrs []dns.RR) string

Key uses the name, type and rdata, which is serialized and then hashed as the key for the lookup.

Types ¶

type Cache ¶

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 ¶

func New(capacity, ttl int) *Cache

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

func (*Cache) Capacity ¶

func (c *Cache) Capacity() int

func (*Cache) EvictRandom ¶

func (c *Cache) EvictRandom()

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

func (*Cache) Hit ¶

func (c *Cache) Hit(question dns.Question, dnssec, tcp bool, msgid uint16) *dns.Msg

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

func (*Cache) InsertMessage ¶

func (c *Cache) InsertMessage(s string, msg *dns.Msg)

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

func (*Cache) InsertSignature ¶

func (c *Cache) InsertSignature(s string, sig *dns.RRSIG)

InsertSignature inserts a signature, the expiration time is used as the cache ttl.

func (*Cache) Remove ¶

func (c *Cache) Remove(s string)

func (*Cache) Search ¶

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.

Source Files ¶

cache.go hit.go