Redis 4.x Cookbook

How to do it...

Let's take the Lua script introduced in the previous recipe to show how to debug a Lua script of Redis as an example:

1. Open a console and update the script, as follows:

$ mkdir /redis/coding/lua; cd /redis/coding/lua 
$ cat updatejsondebug.lua  
local id = KEYS[1] 
local data = ARGV[1] 
redis.debug(id) 
redis.debug(data) 
 
local retJson = redis.call('get',  id) 
local dataSource = cjson.decode(data) 
 
if retJson == false then 
  retJson = {} 
else 
  retJson = cjson.decode(retJson) 
end 
redis.breakpoint() 
 
for k,v in pairs(dataSource) do 
  retJson[k] = v 
end 
 
redis.log(redis.LOG_WARNING,cjson.encode(retJson)) 
redis.call('set', id, cjson.encode(retJson)) 
 
return redis.call('get',id)  

2. Set the user profile with the user ID 992398 by redis-cli:

$ bin/redis-cli ...