CODEWITHSUNDEEP
dockerredislua
Yuri Ligard
Yuri Ligard

Reputation: 21

How to load a redis (lua) lib using 'docker exec' command?

How to load a lib redis (lua) using 'docker exec' command? I'm trying to load a lib in redis using 'docker exec' but I get the following error:

ERR Missing library metadata

Command used:

docker exec redis-db_1 redis-cli -a [password] FUNCTION LOAD "$(cat [path]\ZRANDSCORE.lua)"

Code [ZRANDSCORE.lua]

#!lua name=ZRANDSCORE

local function zrandscore(KEYS, ARGV)

    local set = redis.call('ZRANGEBYSCORE', KEYS[1], ARGV[1], ARGV[2])
    local langth = table.getn(set)
    local member = set[math.random(1, langth)]
    redis.call('ZINCRBY', KEYS[1], ARGV[3], member)
    return {member, langth-1}

end

redis.register_function('ZRANDSCORE', zrandscore)

On the first line, notice that the metadata is reported as instructed in the documentation:

#!<engine name> name=<library name>

so much so that when I run this same code directly in redis I get success execution output

Upvotes: 1

Views: 598

Answers (2)

Murat Demirsoy
Murat Demirsoy

Reputation: 41

This worked for me (Redis 7.0.5):

call docker exec with "-i" option to bind terminal's stdin to docker exec and redis-cli with "-x" option to read its last argument from stdin:

cat <script> | docker exec -i <container> redis-cli -x FUNCTION LOAD REPLACE

note: the script must begin with #!lua name=<libname>

In all other cases redis-cli gives: "ERR Missing library metadata"

Upvotes: 2

Raul Andrade
Raul Andrade

Reputation: 1

have you tried:

docker exec redis-db_1 redis-cli -a [password] FUNCTION LOAD < [path]\ZRANDSCORE.lua

Upvotes: 0

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