Sample session invalidation management with redis and lua

create_session.lua

-------- BEGIN argv ---------
local foo = ARGV[1] -- foo
local bar = ARGV[2] -- foo:bar
local baz = ARGV[3] -- foo:baz
local val = ARGV[4]
local ttl = ARGV[5]
-------- END argv ---------

local key = "sessions::" .. foo .. "::" .. bar .. "::" .. baz

redis.log(redis.LOG_DEBUG, "Started processing " .. key)
redis.call("SETEX", key, ttl, val)
redis.call("SADD", "sessions::foo::" .. foo, key)
redis.call("EXPIRE", "sessions::foo::" .. foo, ttl)
redis.call("SADD", "sessions::bar::" .. bar, key)
redis.call("EXPIRE", "sessions::bar::" .. bar, ttl)
redis.call("SADD", "sessions::baz::" .. baz, key)
redis.call("EXPIRE", "sessions::baz::" .. baz, ttl)
redis.log(redis.LOG_DEBUG, "Finished processing " .. key)

return 1

delete_sessions_by.lua

-------- BEGIN argv ---------
local kind = ARGV[1] -- foo, bar, baz
local val  = ARGV[2]
-------- END argv ---------

local sessions = "sessions::" .. kind .. "::" .. val

redis.log(redis.LOG_DEBUG, "Started deleting sessions for " .. sessions)
local matches = redis.call("SMEMBERS", sessions)
local count = table.getn(matches)
if count > 0 then
  redis.call("UNLINK", unpack(matches))
end
redis.log(redis.LOG_DEBUG, "Finished deleting sessions for " .. sessions)

return count

test_sessions.sh

#!/usr/bin/env bash

create_session_sha=$(cat create_session.lua | redis-cli -x script load)
delete_session_sha=$(cat delete_sessions_by.lua | redis-cli -x script load)

echo "evalsha ${create_session_sha} 0 foo baa baw {} 60" | redis-cli -x
echo "evalsha ${create_session_sha} 0 foo bab baw {} 60" | redis-cli -x
echo "evalsha ${create_session_sha} 0 foo bac baw {} 60" | redis-cli -x
echo "evalsha ${create_session_sha} 0 foo bad baw {} 60" | redis-cli -x
echo "evalsha ${create_session_sha} 0 fop bae baz {} 60" | redis-cli -x
echo "evalsha ${create_session_sha} 0 fop baf baz {} 60" | redis-cli -x
echo "evalsha ${create_session_sha} 0 fop bag baz {} 60" | redis-cli -x
echo "evalsha ${create_session_sha} 0 fop bah baz {} 60" | redis-cli -x


echo "evalsha ${delete_session_sha} 0 foo fop" | redis-cli -x
echo "evalsha ${delete_session_sha} 0 baz baw" | redis-cli -x
echo "evalsha ${delete_session_sha} 0 foo foo" | redis-cli -x