I want to create a simple websocket client

Questions
1

i am newbie to defold and just wanted to merge my simple websocket client to defold 1.9.8 from godot.

What i did:
as mentioned here(WebSocket)

i downloaded a specific version (https://github.com/defold/extension-websocket/archive/refs/tags/4.0.0.zip)

Then i pressed fetch libraries from editor.After that i added this code sample from defold website.


function final(self)
	if self.connection ~= nil then
		websocket.disconnect(self.connection)
	end
end
function init(self)
	self.url = "wss://192.168.1.128:5000/ws?user_id=player1"
	local params = {}
	self.connection = websocket.connect(self.url, params, websocket_callback)
end


local function websocket_callback(self, conn, data)
	if data.event == websocket.EVENT_DISCONNECTED then
		print("Disconnected: " .. tostring(conn))
		self.connection = nil
		
	elseif data.event == websocket.EVENT_CONNECTED then
		
		print("Connected: " .. tostring(conn))
	elseif data.event == websocket.EVENT_ERROR then
		print("Error: '" .. tostring(data.message) .. "'")
		if data.handshake_response then
			print("Handshake response status: '" .. tostring(data.handshake_response.status) .. "'")
			for key, value in pairs(data.handshake_response.headers) do
				print("Handshake response header: '" .. key .. ": " .. value .. "'")
			end
			print("Handshake response body: '" .. tostring(data.handshake_response.response) .. "'")
		end
	elseif data.event == websocket.EVENT_MESSAGE then
		print("Receiving: '" .. tostring(data.message) .. "'")
	end
end

But i doesnt recognize websocket name field.Build terminal says.

/main/main.script
	Line 4: Undefined global `websocket`.
	Line 4: accessing undefined variable 'websocket'
	Line 10: Undefined global `websocket`.
	Line 10: accessing undefined variable 'websocket'
	Line 10: Undefined global `websocket_callback`.
	Line 10: accessing undefined variable 'websocket_callback'
	Line 14: unused function 'websocket_callback'
	Line 15: Undefined global `websocket`.
	Line 15: accessing undefined variable 'websocket'
	Line 19: Undefined global `websocket`.
	Line 19: accessing undefined variable 'websocket'
	Line 22: Undefined global `websocket`.
	Line 22: accessing undefined variable 'websocket'
	Line 31: Undefined global `websocket`.
	Line 31: accessing undefined variable 'websocket'

Note: Also i added this section to may game.project file this code snippet

[websocket]
debug = 1
socket_timeout = 10000000

I need any recommendation about this.

image
image246×188 2.35 KB

2

Is this the entire script file? Do you have anything outside the init() and final() etc? You can not reference websocket from outside the scope of the lifecycle functions.

3

i didnt understand what happened but i swithed off computer after many retry then just checked build terminal and warning no longer there.

The code below is now working normally with my golang server. I just execute commands which are coming from server side.

local function logged(data)
	print(data)
end


local packet_handlers = {
	["logged"] = logged,
}

local function handle_packet(json_string)
	local decoded, _, err = json.decode(json_string)
	if not decoded then
		print("Failed to decode JSON: " .. err)
		return
	end

	local command = decoded.command  
	local handler = packet_handlers[command]

	if handler then
		handler(decoded) 
	else
		print("Unknown command: " .. command)
	end
end
local function websocket_callback(self, conn, data)
	if data.event == websocket.EVENT_DISCONNECTED then
		print("Disconnected: " .. tostring(conn))
		self.connection = nil
	elseif data.event == websocket.EVENT_CONNECTED then
		print("Connected: " .. tostring(conn))
		if data.event == websocket.EVENT_CONNECTED then
			websocket.send(conn,'{"command":"login","data":{}}')
		end
	elseif data.event == websocket.EVENT_ERROR then
		print("Error: '" .. tostring(data.message) .. "'")
		if data.handshake_response then
			print("Handshake response status: '" .. tostring(data.handshake_response.status) .. "'")
			for key, value in pairs(data.handshake_response.headers) do
				print("Handshake response header: '" .. key .. ": " .. value .. "'")
			end
			print("Handshake response body: '" .. tostring(data.handshake_response.response) .. "'")
		end
	elseif data.event == websocket.EVENT_MESSAGE then
		handle_packet(data.message)
		print("Receiving: '" .. tostring(data.message) .. "'" )
	end
end

function init(self)
	self.url = "wss://192.168.1.128:5000/ws?user_id=player2"
	local params = {}
	self.connection = websocket.connect(self.url, params, websocket_callback)
end

function final(self)
	if self.connection ~= nil then
		websocket.disconnect(self.connection)
	end
end
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