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redisutil.go
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redisutil.go
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// redisclient
package redisutil
import (
"github.com/garyburd/redigo/redis"
"sync"
)
type RedisClient struct {
pool *redis.Pool
Address string
}
var (
redisMap map[string]*RedisClient
mapMutex *sync.RWMutex
)
const (
defaultTimeout = 60 * 10 //默认10分钟
)
func init() {
redisMap = make(map[string]*RedisClient)
mapMutex = new(sync.RWMutex)
}
// 重写生成连接池方法
func newPool(redisIP string) *redis.Pool {
return &redis.Pool{
MaxIdle: 5,
MaxActive: 20, // max number of connections
Dial: func() (redis.Conn, error) {
c, err := redis.Dial("tcp", redisIP)
return c, err
},
}
}
//获取指定Address的RedisClient
func GetRedisClient(address string) *RedisClient {
var redis *RedisClient
var mok bool
mapMutex.RLock()
redis, mok = redisMap[address]
mapMutex.RUnlock()
if !mok {
redis = &RedisClient{Address: address, pool: newPool(address)}
mapMutex.Lock()
redisMap[address] = redis
mapMutex.Unlock()
}
return redis
}
//获取指定key的内容, interface{}
func (rc *RedisClient) GetObj(key string) (interface{}, error) {
// 从连接池里面获得一个连接
conn := rc.pool.Get()
// 连接完关闭,其实没有关闭,是放回池里,也就是队列里面,等待下一个重用
defer conn.Close()
reply, errDo := conn.Do("GET", key)
return reply, errDo
}
//获取指定key的内容, string
func (rc *RedisClient) Get(key string) (string, error) {
val, err := redis.String(rc.GetObj(key))
return val, err
}
//检查指定key是否存在
func (rc *RedisClient) Exists(key string) (bool, error) {
// 从连接池里面获得一个连接
conn := rc.pool.Get()
// 连接完关闭,其实没有关闭,是放回池里,也就是队列里面,等待下一个重用
defer conn.Close()
reply, errDo := conn.Do("EXISTS", key)
if errDo == nil && reply == nil {
return false, nil
}
val, err := redis.Int(reply, errDo)
return val > 0, err
}
//删除指定key
func (rc *RedisClient) Del(key string) (int64, error) {
// 从连接池里面获得一个连接
conn := rc.pool.Get()
// 连接完关闭,其实没有关闭,是放回池里,也就是队列里面,等待下一个重用
defer conn.Close()
reply, errDo := conn.Do("DEL", key)
if errDo == nil && reply == nil {
return 0, nil
}
val, err := redis.Int64(reply, errDo)
return val, err
}
//获取指定hashset的内容
func (rc *RedisClient) HGet(hashID string, field string) (string, error) {
conn := rc.pool.Get()
defer conn.Close()
reply, errDo := conn.Do("HGET", hashID, field)
if errDo == nil && reply == nil {
return "", nil
}
val, err := redis.String(reply, errDo)
return val, err
}
//对存储在指定key的数值执行原子的加1操作
func (rc *RedisClient) INCR(key string) (int, error) {
conn := rc.pool.Get()
defer conn.Close()
reply, errDo := conn.Do("INCR", key)
if errDo == nil && reply == nil {
return 0, nil
}
val, err := redis.Int(reply, errDo)
return val, err
}
//对存储在指定key的数值执行原子的减1操作
func (rc *RedisClient) DECR(key string) (int, error) {
conn := rc.pool.Get()
defer conn.Close()
reply, errDo := conn.Do("DECR", key)
if errDo == nil && reply == nil {
return 0, nil
}
val, err := redis.Int(reply, errDo)
return val, err
}
//获取指定hashset的所有内容
func (rc *RedisClient) HGetAll(hashID string) (map[string]string, error) {
conn := rc.pool.Get()
defer conn.Close()
reply, err := redis.StringMap(conn.Do("HGetAll", hashID))
return reply, err
}
//设置指定hashset的内容
func (rc *RedisClient) HSet(hashID string, field string, val string) error {
conn := rc.pool.Get()
defer conn.Close()
_, err := conn.Do("HSET", hashID, field, val)
return err
}
//删除,并获得该列表中的最后一个元素,或阻塞,直到有一个可用
func (rc *RedisClient) BRPop(key string) (string, error) {
conn := rc.pool.Get()
defer conn.Close()
val, err := redis.StringMap(conn.Do("BRPOP", key, defaultTimeout))
if err != nil {
return "", err
} else {
return val[key], nil
}
}
//将所有指定的值插入到存于 key 的列表的头部
func (rc *RedisClient) LPush(key string, val string) (int64, error) {
conn := rc.pool.Get()
defer conn.Close()
ret, err := redis.Int64(conn.Do("LPUSH", key, val))
if err != nil {
return -1, err
} else {
return ret, nil
}
}
func (rc *RedisClient) Set(key string, val interface{}) (interface{}, error) {
conn := rc.pool.Get()
defer conn.Close()
val, err := conn.Do("SET", key, val)
return val, err
}
//设置指定key的内容
func (rc *RedisClient) SetWithExpire(key string, val interface{}, timeOutSeconds int64) (interface{}, error) {
conn := rc.pool.Get()
defer conn.Close()
val, err := conn.Do("SET", key, val, "EX", timeOutSeconds)
return val, err
}
//设置指定key的过期时间
func (rc *RedisClient) Expire(key string, timeOutSeconds int64) (int64, error) {
conn := rc.pool.Get()
defer conn.Close()
val, err := redis.Int64(conn.Do("EXPIRE", key, timeOutSeconds))
return val, err
}
//删除当前数据库里面的所有数据
//这个命令永远不会出现失败
func (rc *RedisClient) FlushDB() {
conn := rc.pool.Get()
defer conn.Close()
conn.Do("FLUSHALL")
}