package main import ( "github.com/hoisie/redis" "github.com/miekg/dns" ) func NewRedisCache(c RedisSettings, expire int32) *RedisCache { rc := &redis.Client{Addr: c.Addr(), Db: c.DB, Password: c.Password} return &RedisCache{ backend: rc, expire: expire, } } type RedisCache struct { Cache backend *redis.Client expire int32 } func (m *RedisCache) Set(key string, msg *dns.Msg) error { var val []byte var err error // handle cases for negacache where it sets nil values if msg == nil { val = []byte("nil") } else { val, err = msg.Pack() } if err != nil { err = SerializerError{err} } return m.backend.Setex(key, int64(m.expire), val) } func (m *RedisCache) Get(key string) (*dns.Msg, error) { var msg dns.Msg item, err := m.backend.Get(key) if err != nil { err = KeyNotFound{key} return &msg, err } err = msg.Unpack(item) if err != nil { err = SerializerError{err} } return &msg, err } func (m *RedisCache) Exists(key string) bool { exists, err := m.backend.Exists(key) if err != nil { return true } return exists } func (m *RedisCache) Remove(key string) error { _, err := m.backend.Del(key) return err } func (m *RedisCache) Full() bool { // memcache is never full (LRU) return false }