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80 lines
1.0 KiB
80 lines
1.0 KiB
package redis
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import (
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"errors"
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"strconv"
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redisdb "github.com/gomodule/redigo/redis"
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)
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//监视key递减
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func WatchSub(key, value string) (bool, error) {
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var err error
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c := GetConn()
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reply, err := c.Do("WATCH", key)
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if err != nil {
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c.Do("UNWATCH")
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return false, err
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}
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reply, err = c.Do("GET", key)
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if err != nil {
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c.Do("UNWATCH")
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return false, err
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}
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stock, err := redisdb.Int64(reply, err)
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if err != nil {
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c.Do("UNWATCH")
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return false, err
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}
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use, err := strconv.ParseInt(value, 10, 64)
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if err != nil {
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c.Do("UNWATCH")
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return false, err
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}
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if stock < use {
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c.Do("UNWATCH")
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return false, errors.New("数量已不足")
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}
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reply, err = c.Do("MULTI")
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if err != nil {
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c.Do("UNWATCH")
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return false, err
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}
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num := stock - use
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reply, err = c.Do("SET", key, num)
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if err != nil {
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c.Do("UNWATCH")
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return false, err
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}
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reply, err = c.Do("EXEC")
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c.Do("UNWATCH")
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CloseConn(c)
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if err != nil {
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return false, err
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}
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if reply != nil {
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return true, err
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}
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return false, err
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}
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