// until redigo supports sharding/clustering, only one host will be in hostList
func NewRedisCache(host, psw string, db, idle, max int, toc, tor, tow, defaultExpiration time.Duration) RedisCache {
var pool = &redis.Pool{
MaxIdle: idle,
MaxActive: max,
IdleTimeout: 240 * time.Second,
Dial: func() (redis.Conn, error) {
c, err := redis.DialTimeout("tcp", host, toc, tor, tow)
if err != nil {
return nil, err
}
if _, err := c.Do("AUTH", psw); err != nil {
c.Close()
return nil, err
}
c.Do("SELECT", db)
// check with PING
if _, err := c.Do("PING"); err != nil {
c.Close()
return nil, err
}
return c, err
},
// custom connection test method
TestOnBorrow: func(c redis.Conn, t time.Time) error {
if _, err := c.Do("PING"); err != nil {
return err
}
return nil
},
}
return RedisCache{pool, defaultExpiration}
}
// Dial dials the local Redis server and selects database 9. To prevent
// stomping on real data, DialTestDB fails if database 9 contains data. The
// returned connection flushes database 9 on close.
func Dial() (redis.Conn, error) {
c, err := redis.DialTimeout("tcp", ":6379", 0, 1*time.Second, 1*time.Second)
if err != nil {
return nil, err
}
_, err = c.Do("SELECT", "9")
if err != nil {
c.Close()
return nil, err
}
n, err := redis.Int(c.Do("DBSIZE"))
if err != nil {
c.Close()
return nil, err
}
if n != 0 {
c.Close()
return nil, errors.New("database #9 is not empty, test can not continue")
}
return testConn{c}, nil
}