add cache module

cache/redis.go

@@ -0,0 +1,97 @@
+package cache
+
+import (
+	"encoding/json"
+	"errors"
+	"github.com/garyburd/redigo/redis"
+)
+
+var (
+	DefaultKey string = "beecacheRedis"
+)
+
+type RedisCache struct {
+	c        redis.Conn
+	conninfo string
+	key      string
+}
+
+func NewRedisCache() *RedisCache {
+	return &RedisCache{key: DefaultKey}
+}
+
+func (rc *RedisCache) Get(key string) interface{} {
+	if rc.c == nil {
+		rc.c = rc.connectInit()
+	}
+	v, err := rc.c.Do("HGET", rc.key, key)
+	if err != nil {
+		return nil
+	}
+	return v
+}
+
+func (rc *RedisCache) Put(key string, val interface{}, timeout int) error {
+	if rc.c == nil {
+		rc.c = rc.connectInit()
+	}
+	_, err := rc.c.Do("HSET", rc.key, key, val)
+	return err
+}
+
+func (rc *RedisCache) Delete(key string) error {
+	if rc.c == nil {
+		rc.c = rc.connectInit()
+	}
+	_, err := rc.c.Do("HDEL", rc.key, key)
+	return err
+}
+
+func (rc *RedisCache) IsExist(key string) bool {
+	if rc.c == nil {
+		rc.c = rc.connectInit()
+	}
+	v, err := redis.Bool(rc.c.Do("HEXISTS", rc.key, key))
+	if err != nil {
+		return false
+	}
+	return v
+}
+
+func (rc *RedisCache) ClearAll() error {
+	if rc.c == nil {
+		rc.c = rc.connectInit()
+	}
+	_, err := rc.c.Do("DEL", rc.key)
+	return err
+}
+
+func (rc *RedisCache) StartAndGC(config string) error {
+	var cf map[string]string
+	json.Unmarshal([]byte(config), &cf)
+	if _, ok := cf["key"]; !ok {
+		cf["key"] = DefaultKey
+	}
+	if _, ok := cf["conn"]; !ok {
+		return errors.New("config has no conn key")
+	}
+	rc.key = cf["key"]
+	rc.conninfo = cf["conn"]
+	rc.c = rc.connectInit()
+	if rc.c == nil {
+		return errors.New("dial tcp conn error")
+	}
+	return nil
+}
+
+func (rc *RedisCache) connectInit() redis.Conn {
+	c, err := redis.Dial("tcp", rc.conninfo)
+	if err != nil {
+		return nil
+	}
+	return c
+}
+
+func init() {
+	Register("redis", NewRedisCache())
+}