package main

// iterating keys with pattern `itachi:taglist:*` in redis, and check if the

// key exists, if not, then delete it from the corresponding tag, and finally,

// delete the key itself.

import (

"log"

"time"

"github.com/garyburd/redigo/redis"

)

func expirationWorker() {

conn := redisPool.Get()

defer conn.Close()

for {

// iterating keys

tagListKeys, err := redis.Strings(conn.Do("KEYS", "obito:taglist:*"))

if err != nil {

log.Panicf("failed to iterate with error: %s", err)

}

for _, tagList := range tagListKeys {

uuid := tagList[14:] // "obito:taglist:"

exists, _ := redis.Bool(conn.Do("EXISTS", "obito:uuid:"+uuid))

if !exists {

log.Printf("key(%s) not exist", tagList)

// delete from tag and finally delete itself

joinedTagList, _ := redis.Strings(conn.Do("ZRANGE", tagList, 0, -1))

for _, joinedTag := range joinedTagList {

log.Printf("gonna remove %s in tag %s", uuid, joinedTag)

conn.Do("ZREM", "obito:tag:"+joinedTag, uuid)

}

log.Printf("gonna remove key %s", tagList)

conn.Do("DEL", tagList)

} else {

log.Printf("key(%s) exist", tagList)

}

}

// sleep a while

time.Sleep(time.Minute * time.Duration(10))

}

}