Nakama official client

The Defoldmine
#22

I couldn’t find Lua reference to create a Match (not a matchmaker) , i used the javascript api as refence .
To Create Match in js you have to use

var response = await socket.createMatch();
console.log("Created match with ID:", response.match.match_id);

You can share the match id with other players to join .
i want to do the same thing using Defold and Lua .
if i am not mistaken , the same should be in Lua :

local match_create_message = {
        match_create = {} -- empty , no arguments		
}
		
local match_result = nakama.socket_send(socket, match_create_message,callback)

This caused the server to disconnect with :

{"level":"warn","ts":"2021-01-04T11:23:32.727Z","msg":"Received malformed payload","uid":"51fc50d1-da4e-4f4c-b74a-ea60e75bad37","sid":"71335a58-9d9d-4d72-8cd4-3942df576269","data":"eyJjaWQiOiIxIiwibWF0Y2hfY3JlYXRlIjpbXX0="}

after decoding the data

{"cid":"1","match_create":[]}
#23

Please have a look here: Nakama official client

#24

I have checked the Official defold client , i couldn’t find a way through making a custom Match(not a match maker) , similar to Realtime Multiplayer - Nakama server (heroiclabs.com)

#25

The error seems to be this

{"cid":"1","match_create":[]}

It should be

{"cid":"1","match_create":{}}

Edit.
I have tested and this is the problem.

#26

To fix it, you to have to patch nakama.engine.defold.lua
You properly have to copy manually the nakama modules to your project.

Change function M.socket_send to be

function M.socket_send(socket, message, callback)
	assert(socket and socket.ws, "You must provide a socket")
	assert(message, "You must provide a message to send")
	socket.cid = socket.cid + 1
	message.cid = tostring(socket.cid)

	socket.requests[message.cid] = callback
	local data = json.encode(message)
	local clean_data = string.gsub(data, "%[%]", "{}")
	pprint("Todo remove", clean_data)
	socket.ws:send(clean_data) 
end
#27

Please create a ticket in the Nakama repo and I’ll make sure to fix it! It should be solved in the Nakama client.

#28

I don’t know if it’s a bug. It come down to how to encode lua’s {} to json. Should it be encoded as “{}” or “[]”.

#29

So this instead of sending a json empty object it sent an empty array .

I have already created a ticket about this topic

Creating a Match in Defold · Issue #17 · heroiclabs/nakama-defold (github.com)

1 Like
#30

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.

2 Likes
#31
#32

@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

#33

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.

1 Like
#34 
    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

#35

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?

3 Likes
#36

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

#37

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="}
#38

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

1 Like
#39

Posted on the Nakama forum too.

1 Like
#40

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.

4 Likes
#41

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?