JSON... Issue with the url

jimlev · January 2022

Hello everyone !
I try to implement a JSON loading of datas for the level's datas of my game.
But, I encounter a strange issue.

If I use the wiki example for JSON, it works great.
But when I've tried to modify the example for my own usage, I didn't achieve to make it works.
So, after a lot of try and fails, I just tried to make the wiki example work with a different value for the JSON url... without success.

Here is the wiki example :
https://wiki.giderosmobile.com/index.php/Json

require('json')
local loader = UrlLoader.new("<a href="http://ip-api.com/json" rel="nofollow">http://ip-api.com/json</a>")
loader:addEventListener(Event.COMPLETE, function(event)
local receivedTable=json.decode(event.data)
print(receivedTable.countryCode)
print(receivedTable.timezone)
end)

Here are the urls I tried :
http://ip-api.com/json (work)
https://jimlev.alwaysdata.net/test.json (error : Expected value but found T_END at character 1)
http://jsonkeeper.com/b/UIDW (error : Expected value but found invalid token at character 1)

Anything I miss ?

SinisterSoft · January 2022

Take a look at event.data, there must be something the json decoder doesn't like...

eg, on the line just after loader, put this:

print(event.data)

if it's a table, just put this instead:

dump(event)

and use this code:

function dump(tt,indent,done)
  done=done or {}
  indent=indent or 0
  if type(tt)=="table" then
    for key,value in pairs(tt) do
      if type(value)=="table" and not done[value] then
        done[value]=true
        print(rep(" ",indent)..(format("[%s] => table",tostring(key))))
        dump(value,indent+2,done)
      else
        print(rep(" ",indent)..(format("[%s] => %s",tostring(key),tostring(value))))
      end
    end
  else
    print(rep(" ",indent)..tt)
  end
end

I also have this at the top of my code:

local sub,len,upper,lower,format,gsub,find,rep,ascii=string.sub,string.len,string.upper,string.lower,string.format,string.gsub,string.find,string.rep,string.byte

jimlev · January 2022

@SinisterSoft always here to help ! thanks a lot !

I tried your additions in my code. That confirm what I was thinking : the code is ok, but the way / place the json is hosted seems to be the problem.

I explain :

http://ip-api.com/json >>> with that host, the dump gives me... the json content.

https://jimlev.alwaysdata.net/test.json >>> on that url, nothing happen : no errors, no message, dump do nothing. If I change the url from https to http, I still have an error "Expected value but found T_END at character"

http://jsonkeeper.com/b/UIDW >>> on that one, the dump gives me... an HTML header!!! how is it possible, I don't know but, in that case, now it's clear that the error ("invalid token at character 1") is given because of the < (first character of the HTML page).

I'm going to investigate a bit more.

SinisterSoft : could you, please, explain me briefly what is the use of that line ?

local sub,len,upper,lower,format,gsub,find,...

MoKaLux · January 2022

jimlev said:
SinisterSoft : could you, please, explain me briefly what is the use of that line ?

local sub,len,upper,lower,format,gsub,find,...

I am not SinisterSoft but will try to answer

This line simply simplifies the writing of the code, for example he assigns local upper to string.upper so this will shorten your code and your typing.

EDIT: and as mentioned below will speed up your code

rrraptor · January 2022

MoKaLux said:

jimlev said:
SinisterSoft : could you, please, explain me briefly what is the use of that line ?

local sub,len,upper,lower,format,gsub,find,...
I am not SinisterSoft but will try to answer
This line simply simplifies the writing of the code, for example he assigns local upper to string.upper so this will shorten your code and your typing.

No, its not

http://lua-users.org/wiki/OptimisingUsingLocalVariables
http://kiki.to/blog/2014/04/04/rule-3-allow-monkeypatching/

keszegh · January 2022

@MoKaLux , localizing functions also makes the code run faster but indeed it does not have an effect otherwise.

keszegh · January 2022

btw i've found some things saying that in luau (which comes with next gideros version) this localizing is less useful:
https://devforum.roblox.com/t/should-i-be-localizing-these-variablesfunctions/568955
is it?

jimlev · January 2022

Ladies and Gentlemen, please, could we get back to MY JSON issue

hgy29 · January 2022

For the SSL case, if you are on the desktop player, check this: https://forum.gideros.rocks/discussion/comment/61529/#Comment_61529

SinisterSoft · January 2022

@jimlev It both makes the code easier to write (saves typing) and speeds up code on Lua (not yet sure about speed increases with Luau - but Luau overall gives a speed increase without modifying any code).

@keszegh I'm not sure if getting the pointer to the function then calling that is still faster or maybe slower or the same speed in Luau. I can try do some tests though once @hgy29 does a new test build.

hgy29 · January 2022

@jimlev, not sure if you are still experimenting or what, but I tested your code here and got the same error, however here is what my browser says about that returned data:

header("Content-type: application/json; charset=utf-8");
<?php 
header("Content-type: application/json; charset=utf-8");
?>
{
	"status": "success",
	"country": "France",
	"countryCode": "FR",
	"region": "IDF",
	"regionName": "Île-de-France",
	"city": "Paris",
	"zip": "75017",
	"lat": 48.8323,
	"lon": 2.4075,
	"timezone": "Europe/Paris",
	"isp": "France Telecom Orange",
	"org": "",
	"as": "AS3215 Orange S.A.",
	"query": "90.127.14.20"
}

Notice the 'header' and PHP code in the returned data

jimlev · January 2022

yes I'm still "experimenting"

First of all, I didn't achieve to correct the httpS issue. I added the .dll files t my Gideros folder but with no result.

When I try to load the JSON from non-https, the dump show that it's the redirect

ex.:
local loader = UrlLoader.new("http://jsonkeeper.com/b/UIDW")
gives :
"301 Moved Permanently..."

I'm just surprised that the jsonkeeper service, which is made to deliver properly JSON files is not able to deliver through http and only https.
I will also probably search for a SQL solution which can be a good alternative, may be more documented...

jimlev · January 2022

hgy29 said:
@jimlev, not sure if you are still experimenting or what, but I tested your code here and got the same error, however here is what my browser says about that returned data:
header("Content-type: application/json; charset=utf-8");
<?php 
header("Content-type: application/json; charset=utf-8");
?>
{
	"status": "success",
	"country": "France",
	"countryCode": "FR",
	"region": "IDF",
	"regionName": "Île-de-France",
	"city": "Paris",
	"zip": "75017",
	"lat": 48.8323,
	"lon": 2.4075,
	"timezone": "Europe/Paris",
	"isp": "France Telecom Orange",
	"org": "",
	"as": "AS3215 Orange S.A.",
	"query": "90.127.14.20"
}
Notice the 'header' and PHP code in the returned data

Note that I have modified 4 or 5 times that file this morning to try to solve the way the file is treated by the server and the header is "displayed"

jimlev · January 2022

Any other external data loading I can consider to load small 'structured' contents from outside Gideros as an alternative to JSON ?

jimlev · January 2022

I finally achieve to make my JSON loading works.
It still makes an error on gideros player on desktop but, when I try it on gideros player on my mobile, it works great.

Now, I try to make the HTML5 export works but I have an error and I think it's still that damn JSON plugin.

Here is the message I get :

Oops, something went wrong...

An unexpected error occured
The details below may be helpful to you or the app developer... hopefully.
exception thrown: TypeError: what.includes is not a function

Error can be seen here : https://jimlev.alwaysdata.net/game/RapidoQuizz/

It's the first time I use a plug-in with gideros. Do I need to add some files to the export folder ? I added the

require("json")

on first line of main.lua...

Edit1: on export, I tried with Compression setting On and Off, PWA check or not, etc...

MoKaLux · January 2022

did you add json in plugins as well? (on the left in library)

jimlev · January 2022

In the gideros editor? Yes! And it works great when I test my app in mobile player...

hgy29 · January 2022

Hey @jimlev, just before the exception in red, I see in the console 'Sorry: location xxx not allowed". This means that you explictly set a domain in the HTML5 export tab in the studio, and that domain doesn't match the one you are running from

jimlev · January 2022

Thanks ! I tried a lot of parameters combinations anad that one was an attempt I forgot to clear.

Now, I achieved to make something with my first JSON loading. It works and give me the params I need... But now, it's the second one who gives me an error... I'm going mad.

edit : ~~It's aliiiiivvve.~~ hum hum... problem found. It works

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