lua-resty-redis

anton.heryanto · 2013-09-16T05:46:17+00:00

Great. Thanks for much for the clarification, and thanks so much for your great work with openresty!On Sun, Sep 15, 2013 at 5:01 PM, Yichun Zhang (agentzh) &...

lua-resty-redis

anton.heryanto

first thank for great nginx module
openresty is very interesting platform and fast

just try to develop nginx + lua + resty
but I'm stuck how is the best way to send command to redis

uses case

a user has roles with their respective acl

user:1:roles => [1,2]
role:1:acl => ["access user", "edit user"]
role:2:acl => ["access user"]

i need to get unique acl only therefore i uses redis sunion command

local cjson = require "cjson"
local redis = require "resty.redis"
local r = redis:new()
r:set_timeout(1000)
r:connect("127.0.0.1", 6379)

local roles = r:smembers("user:1:roles")
for index, role in ipairs(roles) do
// generate key string or table pass to redis sunion as param
end
local acl = r:sunion("role:1:acl", "role:1:acl") //how can i query sunion with respective key dynamically (instead of hard code it)
local result = cjson.encode(acl)
ngx.say(resul)

r:set_keepalive(0,1024)

is there a way i can pass table array as parameter to lua-resty-redis
or how to query row command ( i have inspect lua code it seem local so can be accessed outside module)

agentzh

Hello!

On Sun, Sep 15, 2013 at 2:46 PM, Anton Heryanto wrote:
> first thank for great nginx module
> openresty is very interesting platform and fast
>

Glad you like it!

> local acl = r:sunion("role:1:acl", "role:1:acl")  //how can i query sunion
> with respective key dynamically (instead of hard code it)
[...]
>
>  is there a way i can pass table array as parameter to lua-resty-redis
> or how to query row command ( i have inspect lua code it seem local so can
> be accessed outside module)
>

This is a FAQ in general Lua programming.

To answer your question, just use Lua's standard function unpack() for
to convert a Lua array-like table into a list. For example,

    local roles = { "role:1:acl", "role:2:acl" }
    local acl = r:sunion(unpack(roles))

where the "roles" Lua table can be constructed by your own Lua loops,
of course. See also
http://www.lua.org/manual/5.1/manual.html#pdf-unpack

Best regards,
-agentzh

anton.heryanto

wow thanks for quick response,

still new with nginx and lua concept bit struggling,
need to learn lua more

regard

Anton

On Monday, September 16, 2013 11:00:33 AM UTC+8, agentzh wrote:

Hello!

On Sun, Sep 15, 2013 at 2:46 PM, Anton Heryanto wrote:
> first thank for great nginx module
> openresty is very interesting platform and fast
>

Glad you like it!

> local acl = r:sunion("role:1:acl", "role:1:acl") //how can i query sunion
> with respective key dynamically (instead of hard code it)
[...]
>
> is there a way i can pass table array as parameter to lua-resty-redis
> or how to query row command ( i have inspect lua code it seem local so can
> be accessed outside module)
>

This is a FAQ in general Lua programming.

To answer your question, just use Lua's standard function unpack() for
to convert a Lua array-like table into a list. For example,

local roles = { "role:1:acl", "role:2:acl" }
local acl = r:sunion(unpack(roles))

where the "roles" Lua table can be constructed by your own Lua loops,
of course. See also
http://www.lua.org/manual/5.1/manual.html#pdf-unpack

Best regards,
-agentzh