137 lines
2.7 KiB
Go
137 lines
2.7 KiB
Go
package cache
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import (
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"encoding/json"
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"errors"
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"time"
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"github.com/beego/redigo/redis"
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"github.com/astaxie/beego/cache"
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)
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var (
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// the collection name of redis for cache adapter.
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DefaultKey string = "beecacheRedis"
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)
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// Redis cache adapter.
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type RedisCache struct {
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p *redis.Pool // redis connection pool
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conninfo string
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key string
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}
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// create new redis cache with default collection name.
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func NewRedisCache() *RedisCache {
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return &RedisCache{key: DefaultKey}
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}
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// actually do the redis cmds
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func (rc *RedisCache) do(commandName string, args ...interface{}) (reply interface{}, err error) {
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c := rc.p.Get()
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defer c.Close()
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return c.Do(commandName, args...)
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}
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// Get cache from redis.
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func (rc *RedisCache) Get(key string) interface{} {
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v, err := rc.do("HGET", rc.key, key)
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if err != nil {
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return nil
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}
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return v
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}
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// put cache to redis.
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// timeout is ignored.
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func (rc *RedisCache) Put(key string, val interface{}, timeout int64) error {
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_, err := rc.do("HSET", rc.key, key, val)
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return err
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}
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// delete cache in redis.
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func (rc *RedisCache) Delete(key string) error {
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_, err := rc.do("HDEL", rc.key, key)
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return err
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}
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// check cache exist in redis.
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func (rc *RedisCache) IsExist(key string) bool {
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v, err := redis.Bool(rc.do("HEXISTS", rc.key, key))
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if err != nil {
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return false
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}
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return v
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}
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// increase counter in redis.
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func (rc *RedisCache) Incr(key string) error {
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_, err := redis.Bool(rc.do("HINCRBY", rc.key, key, 1))
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return err
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}
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// decrease counter in redis.
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func (rc *RedisCache) Decr(key string) error {
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_, err := redis.Bool(rc.do("HINCRBY", rc.key, key, -1))
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return err
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}
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// clean all cache in redis. delete this redis collection.
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func (rc *RedisCache) ClearAll() error {
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_, err := rc.do("DEL", rc.key)
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return err
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}
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// start redis cache adapter.
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// config is like {"key":"collection key","conn":"connection info"}
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// the cache item in redis are stored forever,
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// so no gc operation.
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func (rc *RedisCache) StartAndGC(config string) error {
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var cf map[string]string
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json.Unmarshal([]byte(config), &cf)
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if _, ok := cf["key"]; !ok {
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cf["key"] = DefaultKey
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}
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if _, ok := cf["conn"]; !ok {
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return errors.New("config has no conn key")
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}
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rc.key = cf["key"]
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rc.conninfo = cf["conn"]
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rc.connectInit()
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c := rc.p.Get()
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defer c.Close()
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if err := c.Err(); err != nil {
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return err
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}
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return nil
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}
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// connect to redis.
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func (rc *RedisCache) connectInit() {
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// initialize a new pool
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rc.p = &redis.Pool{
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MaxIdle: 3,
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IdleTimeout: 180 * time.Second,
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Dial: func() (redis.Conn, error) {
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c, err := redis.Dial("tcp", rc.conninfo)
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if err != nil {
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return nil, err
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}
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return c, nil
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},
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}
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}
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func init() {
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cache.Register("redis", NewRedisCache())
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}
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