Question 247490 in Redis Question posted in
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REDIS HSET setting EXpiration time correctly

redis-cli INFO SERVER
# Server
redis_version:7.0.5
...

So in node caching some user data the problem having is that the ‘EX’ instead of setting as the expiration time in seconds is puting as field have the code as follow:

        const resultCached = await redisClient.hset(
            accessToken,
            'user',
            JSON.stringify({
                'username'  : username,
                'passHash'  : passHash,
                'loginToken': accessTokenHash
            }),
            'EX',
            7200
        );

command to return all fields of this hash are can see the problem as returns "EX" as a field

redis-cli HGETALL '$2a$08$a9dv5bFwxsP0Z0eVUuw9XOOwNq85MvP5XHZbpw1cCgfvjlqeqQs0G'
1) "EX"
2) "7200"
3) "user"
4) "{"username":"xpto1","passHash":"$2a$08$MeJDVEAw.JKvuKKlC84gMuy0/dZZ/BOsoZSphxuPJZU.1Ro6W6tA.","loginToken":"$2a$08$5Pqd6WDZaw6.D71kbqciA.Bz1USDVzPYGqbnQ4BnQcDhZXwofL6La"}"

Wrong this should’t be a field but a config of the expiration of this key/data

~$ redis-cli HGET '$2a$08$a9dv5bFwxsP0Z0eVUuw9XOOwNq85MvP5XHZbpw1cCgfvjlqeqQs0G' 'EX'
"7200"

correct:

$ redis-cli HGET '$2a$08$a9dv5bFwxsP0Z0eVUuw9XOOwNq85MvP5XHZbpw1cCgfvjlqeqQs0G' 'user'
""username":"xpto1","passHash":"$2a$08$MeJDVEAw.JKvuKKlC84gMuy0/dZZ/BOsoZSphxuPJZU.1Ro6W6tA.","loginToken":"$2a$08$5Pqd6WDZaw6.D71kbqciA.Bz1USDVzPYGqbnQ4BnQcDhZXwofL6La"}"

my question what is the correct format to recongize as config param ("EX") expiration and not a extra field of this key (note in case of set it works well as expected only in hset having the problem)

Tags:

2

Answers


  1. Chosen as BEST ANSWER
    0

    Using a separate command expire works well still would prefer to make in single command if possible.

    const resultExpire = await redisClient.expire(
                        accessToken,
                        10
                     );

  2. 0

    You can run the HSET then EX commands in a single network round trip like this which will optimize things somewhat:

    await Promise.all([
    redisClient.hSet(accessToken, 'user', JSON.stringify(whatever)),
    redisClient.expire(accessToken, 10)
]);

    In node-redis v4 and up, this will use Redis pipelining to send both commands to the server in the same round trip. https://redis.io/docs/manual/pipelining/

    You can’t do this with a single command as there isn’t a HSETEX or equivalent command.

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