nested callback

janfma · April 6, 2014, 8:42pm

Hi.

I’m trying to use Pubnub with Corona SDK:

https://github.com/pubnub/lua/tree/master/corona

I can subscribe and send messages ok, but when I try to use the “time” function, I get this error:

Runtime error &nbsp;&nbsp; &nbsp;/Users/Frode/Documents/Corona\_Files/Roto/pubnub.lua:534: attempt to call upvalue 'callback' (a table value)

I require Pubnub like this:

require "pubnub" pubnub\_obj = pubnub.new({ &nbsp;&nbsp;&nbsp;&nbsp;publish\_key = "xxx", &nbsp;&nbsp;&nbsp; subscribe\_key = "xxx", &nbsp;&nbsp;&nbsp; secret\_key = "xxx", &nbsp;&nbsp;&nbsp; ssl = nil, origin = "pubsub.pubnub.com" }) function getPubNubTime() &nbsp;&nbsp; &nbsp;pubnub\_obj:time({ &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;callback = function(time) -- PRINT TIME &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;print("PUBNUB SERVER TIME: " .. time) &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;end &nbsp;&nbsp; &nbsp;}) end &nbsp; getPubNubTime( ) &nbsp;

I’m not a lua wizard, but it seems strange to have two “callback’s” in the self:time function??

This is what the “time” functions looks like inside the “pubnub.lua” file:

function self:time(callback) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if not callback then &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return print("Missing Time Callback") &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;end &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;self:\_request({ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;url = build\_url({ "time", "0" }), &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;callback = function(response) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if response then &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return callback(response[1]) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;end &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;callback(nil) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;end, &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;fail = function(response) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;callback(nil) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;end &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}) &nbsp;&nbsp;&nbsp;&nbsp;end &nbsp;

Best Regards,

Frode

cody60 · April 6, 2014, 10:10pm

Have you tried using it like this :

[lua]

function getPubNubTime()
   pubnub_obj:time(function(time)
       print("PUBNUB SERVER TIME: " … time)
   end)
end
getPubNubTime( )
[/lua]

Regards,

Keyosk

janfma · April 7, 2014, 8:20pm

Yes that worked. Thank you. I’ve spoken to the Pubnub people and they have allready updated the docs

cody60 · April 6, 2014, 10:10pm