Nakama official client

kiprono · January 5, 2021, 8:16am

Yes, that is the issue. I will properly create a pull request.
Talking of which the nakama API seems to have changed, For example in the authenticate_email callback, it does not return result.error but result.code.

Edit.
I have created a pull request in github.

MrZak-dev · January 5, 2021, 6:52pm

MrZak-dev · January 6, 2021, 7:48am

@kiprono
What if actually we meant to send an empty array for example , this will force all [ ] to be { } without exceptions .
e.g :

local match_data = {
    match_data_send = {
        match_id = match.match.match_id,
        op_code = 1337,
        data = {
            players = {} -- i want to receive it as an empty array
        }
    }
}

if i am not mistaken, in this case the players will be converted to Json object instead of an empty array of players

britzl · January 6, 2021, 8:39am

Yep, this is a problem with json encoding an empty table from Lua since you can’t tell if it is supposed to be an empty array or an empty object. I don’t have a good solution for it.

MrZak-dev · January 6, 2021, 9:40am

    local data = json.encode(message)
    local message
    local is_match_create = string.find(data,"match_create")
    if is_match_create ~= nil then -- match_create message
        message = string.gsub(data, "%[%]", "{}") -- array to json object
    end
	
    socket.ws:send(message)

based on @kiprono solution
this works in case a user send a match_create message , i guess this type of message is the only one that’s being sent without params

totebo · March 12, 2021, 2:53pm

Hey guys, first of all I want to say that Nakama is AWESOME. Being able to write server code in lua has enabled me to set up a simple realtime multiplayer game quickly. This is so much fun.

I bumped into a small problem when attempting to join a match. Sending this from the client:

local metadata = {}
metadata.equipped_weapon_type = 1
local metadata_json = json.encode(metadata) -- {"equipped_weapon_type":1}
local message = nakama.create_match_join_message(match_id, token, metadata_json)

--[[
-- message:
{ 
  match_join = { --[[0x120d6fe00]]
    match_id = "9b8d2c60-25e5-4ddb-8e26-d0717d47dfb4.nakama-node-1",
    metadata = "{"equipped_weapon_type":1}"
  }
}
--]]

local result = nakama.socket_send(socket, message) -- This call fails

Results in this server error:

{"level":"debug","ts":"2021-03-12T14:29:54.210Z","msg":"Error reading message from client","uid":"4b4b9e18-8c26-4a62-a857-9f97f994ac7c","sid":"66a02717-d678-4b5a-9855-7f030c5136c1","error":"websocket: close 1006 (abnormal closure): unexpected EOF"}

If the metadata parameter is nil everything works as it should. I haven’t found any documentation about how the metadata should be formatted, hence this post. Any ideas?

britzl · March 12, 2021, 2:58pm

What if you don’t json.encode the metadata and instead send it as a table?

totebo · March 12, 2021, 3:02pm

I tried that first by mistake actually! It produces a different error:

{"level":"warn","ts":"2021-03-12T15:01:19.829Z","msg":"Received malformed payload","uid":"c5922789-ae72-4c54-8ec1-b475b3aa4358","sid":"d5101fde-45ce-4ac5-86e2-97b7d8076624","data":"eyJjaWQiOiIyIiwibWF0Y2hfam9pbiI6eyJtZXRhZGF0YSI6eyJ3ZWFwb25fdHlwZSI6MX0sIm1hdGNoX2lkIjoiZWNjMDFkYjAtZjE0MC00MDk0LTk0YzYtNmJlOWUxYzU1ODMyLm5ha2FtYS1ub2RlLTEifX0="}

britzl · March 12, 2021, 3:06pm

Hmm, perhaps @novabyte sees and can help us out. Otherwise I’d recommend posting on the Nakama forum to get help.

totebo · March 12, 2021, 3:19pm

Posted on the Nakama forum too.

totebo · March 13, 2021, 12:55pm

Solved! The metadata has to be a table containing only strings as values. Like this:

local metadata = {}
metadata.equipped_weapon_type = "1"
local message = nakama.create_match_join_message(match_id, token, metadata)

More info on Nakama’s forums.

Lex · March 15, 2021, 12:56pm

I can’t find the method to validate in-app purchases from both Google and iOS as mentioned here:
https://heroiclabs.com/docs/in-app-purchase-validation/#recovering-purchases

Are they absent from the current Nakama defold integration?

britzl · March 15, 2021, 1:39pm

Good question! The code snippets in the docs only show Unity examples. Post on the Nakama forum as well and ask!

novabyte · March 23, 2021, 3:18pm

@Lex The IAP validation stuff was moved to Lua utils a while back and that page should not be reachable in our main documentation (I think it’s left behind because of a CDN). We are working to bring back the official API for it though with new improvements to handle subscription callbacks with Battle Pass style purchases. The new IAP system with support AppStore, Play Store, and AppGallery (from Huawei).

In the meantime have a look at this code for what you need:

Lex · March 24, 2021, 7:50am

Thanks for the help!
Yes I figured it out and implemented it correctly.

By the way, I had the add the query parameter unwrap=1 when calling RPC functions, otherwise it wouldn’t work.

@novabyte Do you have any example of working Nakama+Defold Google login?
I can’t make it work, because I can’t get the Oauth token from the Google Play Game Services Defold SDK.
Is there any other way to get the Google Oauth token? (I posted a thread Google Play Game service: access token for Nakama but can’t get help on this).

britzl · March 24, 2021, 11:18am

I saw the PR for this here: https://github.com/heroiclabs/nakama-defold/pull/27

I added a comment about this since the PR modified generated code which would get overwritten the next time the API was generated.

Alexander_Bulatov · October 30, 2022, 4:53am

i try to send message, but nothing happen:

function M.sendMessage()
	nakama.sync(function()
		local data = json.encode({
			row = 11,
			col = 22,
		})
		data=base64.encode(data)
		local op_code = 1
		local result = nakama_socket.match_data_send(socket, matchID, op_code, data)
		print("sended")
		if result.error then
			print(result.error.message)
			pprint(result)
		else
			print("ok!!!")
		end
	end)
end

“sended” - is not print. Please help! What i do wrong?

britzl · October 30, 2022, 6:45am

Which Nakama version are you using? The fact that you do not see your print indicates that something crashed inside the coroutine. But there console should show the error. You can try sending it without a coroutine (ie not inside nakama.sync)

Also, they should be no need to base 64 encode the data. It is handled automatically:

github.com

heroiclabs/nakama-defold/blob/master/nakama/socket.lua#L23

    
      
          		if socket.events[event_id] then
          			socket.events[event_id](message)
          			return
          		end
          	end
          	log("Unhandled message")
          end
          
          
local function socket_send(socket, message, callback)
          	if message.match_data_send and message.match_data_send.data then
          		message.match_data_send.data = b64.encode(message.match_data_send.data)
          	end
          
          
	if callback then
          		socket.engine.socket_send(socket, message, callback)
          	else
          		return async(function(done)
          			socket.engine.socket_send(socket, message, done)
          		end)
          	end
          end

Alexander_Bulatov · October 30, 2022, 6:54am

I used 3.0.3, then I saw on github that I needed to use the master. Yes indeed b64 is no longer needed.
if i send without “sync” i have error:

ERROR:SCRIPT: nakama/util/async.lua:19: assertion failed!
stack traceback:
  [C]:-1: in function assert
  nakama/util/async.lua:19: in function match_data_send
  main/multiplayer.lua:122: in function sendMessage
  main/main.gui_script:31: in function callback
  druid/event.lua:90: in function trigger
  druid/base/button.lua:88: in function on_button_click
  druid/base/button.lua:159: in function on_input
  druid/system/druid_instance.lua:183: in function process_input
  druid/system/druid_instance.lua:359: in function <druid/system/druid_instance.lua:354>

britzl · October 30, 2022, 11:26am

Did you provide a callback function? Required if you are not running from a coroutine.