leandromoreira

-- ngx.timer.every(sync_interval, sync, self)
ngx.timer.every(sync_interval, sync, self)

leandromoreira

ffmpeg -i ${source} \
-vcodec libwebp -lossless 0 -q:v 75 -preset picture -loop 0 -an -vsync 0 -filter_complex "setpts=0.5*PTS,fps=12,scale=w=320:h=-2" -t 10 animated.webp

leandromoreira

--    location /test {
--      content_by_lua_block {
        local redis_client = redis_cluster:new(config)
        --- simulating a dynamic code being stored at Redis ---
        redis_client:set('authentication', "access_by_lua_block||local token = ngx.var.arg_token or ngx.var.cookie_superstition \n if token ~= 'token' then \n return ngx.exit(ngx.HTTP_FORBIDDEN) \n else \n ngx.header['Set-Cookie'] = {'superstition=token'} \n end")
        redis_client:sadd('coding_units', 'authentication')
        --- simulating a dynamic code being stored at Redis ---

        --- fetch ---
        local resp, err = redis_client:smembers("coding_units")

leandromoreira

--- fetch ---
local resp, err = redis_client:smembers("coding_units")
local raw_coding_units = {}
for _, coding_unit_key in ipairs(resp) do
  local resp, err = redis_client:get(coding_unit_key) -- it'd be nice to keep the id for logging reasons
   table.insert(raw_coding_units, resp)
end
--- fetch ---

--- parse ---

leandromoreira

-- Error during evaluation - syntactically invalid
code, err = loadstring(" a  = 1 \n a a \n pring(a) \n") 
print(code)
-- nil
print(err)
-- [string " a  = 1 ..."]:2: '=' expected near 'a'

-- Error during runtime - syntactically valid
stringcode = " a = taketime.menu "
code, err = loadstring(stringcode)

leandromoreira

-- running luajit in repl will be useful for exploration
-- docker run -it --rm akorn/luajit:2.1-alpine

-- just inspired at
-- https://stackoverflow.com/questions/1426954/split-string-in-lua
function mysplit (inputstr, sep)
  if sep == nil then
    sep = "%s"
  end
  local t={}

leandromoreira

# run this in one tab
docker run --rm -it --name some-redis redis

# run this in another tab
docker exec -it some-redis redis-cli
127.0.0.1:6379> set authentication "access_by_lua_block||if token ~= 'token' then \n return ngx.exit(ngx.HTTP_FORBIDDEN) \n else \n ngx.header['Set-Cookie'] = {'superstition=token'} \n end"
OK
127.0.0.1:6379> get authentication
"access_by_lua_block||if token ~= 'token' then \n return ngx.exit(ngx.HTTP_FORBIDDEN) \n else \n ngx.header['Set-Cookie'] = {'superstition=token'} \n end"
127.0.0.1:6379> sadd coding_units authentication

leandromoreira

# make sure you have docker
git clone https://github.com/leandromoreira/nott.git
cd nott
git checkout 1.0.2

# in a tab
make run

# wait until the platform is up and running
# and in another tab run

leandromoreira

-- counting how many requests a given ip did
local redis_client = redis_cluster:new(config)
local resp, err = redis_client:incr(ngx.var.remote_addr)
ngx.header['X-Request-Counter'] = resp

leandromoreira

# make sure you have docker
git clone https://github.com/leandromoreira/nott.git
cd nott
git checkout 0.0.3

# in a tab
make run

# wait until the platform is up and running
# and in another tab run