Debugging Redis Lua scripts

howto.md

// Source: https://redislabs.com/blog/5-methods-for-tracing-and-debugging-redis-lua-scripts#.VL2w7GRNoq4

1. Use Redis Log

redis.log(redis.LOG_WARNING, "foo bar")

2. Return log as Lua table

local logtable = {}
local function logit(msg)
  logtable[#logtable+1] = msg
end

logit("foo")
logit("bar")

return logtable

3. Use Redis to store the logs

local loglist = "log"
-- DEL log
local function logit(msg)
  redis.pcall("RPUSH", loglist, msg)
end
-- LRANGE log 0 -1

logit("foo")
logit("bar")