Difference between revisions of "lua-enet"

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lua-enet is simply some lua bindings for ENet.
+
{{newin|[[0.9.0]]|090|type=module}}
  
ENet's purpose is to provide a relatively thin, simple and robust network communication layer on top of UDP (User Datagram Protocol).The primary feature it provides is optional reliable, in-order delivery of packets.
+
{{notice|Official documentation for lua-enet is available [http://leafo.net/lua-enet/ here]. ENet's features are listed on its [http://enet.bespin.org/Features.html homepage]. The official documentation may have typos. The documentation on this wiki reflects Löve's implementation, meaning it should be safe to follow what's written here.}}
 +
 
 +
lua-enet is simply some Lua bindings for ENet.
 +
 
 +
ENet's purpose is to provide a relatively thin, simple and robust network communication layer for games on top of UDP (User Datagram Protocol).The primary feature it provides is optional reliable, in-order delivery of packets.
  
 
ENet omits certain higher level networking features such as authentication, lobbying, server discovery, encryption, or other similar tasks that are particularly application specific so that the library remains flexible, portable, and easily embeddable.
 
ENet omits certain higher level networking features such as authentication, lobbying, server discovery, encryption, or other similar tasks that are particularly application specific so that the library remains flexible, portable, and easily embeddable.
Line 14: Line 18:
 
|[[enet.peer | peer]]
 
|[[enet.peer | peer]]
 
|An ENet peer which data packets may be sent or received from.
 
|An ENet peer which data packets may be sent or received from.
 +
|-
 +
|[[enet.event | event]]
 +
|A simple table containing information on an event.
 
|}
 
|}
  
Line 21: Line 28:
 
!Description
 
!Description
 
|-
 
|-
|[[enet.host:service | host:service]]
 
|Wait for events, send and receive any ready packets.
 
|-
 
|[[enet.host:check_events | host:check_events]]
 
|Checks for any queued events and dispatches one if available.
 
|-
 
|[[enet.host:connect | host:connect]]
 
|Connects a host to a remote host. Returns peer object associated with remote host.
 
|-
 
|[[enet.host:flush | host:flush]]
 
|Sends any queued packets.
 
|-
 
|[[enet.host:broadcast | host:broadcast]]
 
|Queues a packet to be sent to all connected peers.
 
|-
 
|[[enet.host:channel_limit | host:channel_limit]]
 
|Sets the maximum number of channels allowed.
 
|-
 
|[[enet.host:bandwidth_limit | host:bandwidth_limit]]
 
|Sets the bandwidth limits of the host in bytes/sec.
 
|-
 
|[[enet.host:socket_get_address | host:socket_getaddress]]
 
|Returns a string that describes the socket address of the given host.
 
|-
 
|[[enet.host:total_sent_data | host:total_sent_data]]
 
|Returns the number of bytes that were sent through the given host.
 
|-
 
|[[enet.host:total_received_data | host:total_received_data]]
 
|Returns the number of bytes that were received by the given host.
 
|-
 
|[[enet.host:service_time | host:service_time]]
 
|Returns the timestamp of the last call to host:service() or host:flush().
 
|-
 
|[[enet.host:peer_count | host:peer_count]]
 
|Returns the number of peers that are allocated for the given host.
 
|-
 
|[[enet.host:get_peer | host:get_peer]]
 
|Returns the connected peer at the specified index (starting at 1).
 
|-
 
|[[enet.peer:disconnect | peer:disconnect]]
 
|Requests a disconnection from the peer.
 
|-
 
|[[enet.peer:disconnect_now | peer:disconnect_now]]
 
|Force immediate disconnection from peer.
 
|-
 
|[[enet.peer:disconnect_later | peer:disconnect_later]]
 
|Request a disconnection from peer, but only after all queued outgoing packets are sent.
 
|-
 
|[[enet.peer:reset | peer:reset]]
 
|Forcefully disconnects peer. The peer is not notified of the disconnection.
 
|-
 
|[[enet.peer:ping | peer:ping]]
 
|Send a ping request to peer, updates round_trip_time. This is called automatically at regular intervals.
 
|-
 
|[[enet.peer:receive | peer:receive]]
 
|Attempts to dequeue an incoming packet for this peer.
 
|-
 
|[[enet.peer:send | peer:send]]
 
|Queues a packet to be sent to peer.
 
|-
 
|[[enet.peer:throttle_configure | peer:throttle_configure]]
 
|Changes the probability at which unreliable packets should not be dropped.
 
|-
 
|[[enet.peer:ping_interval | peer:ping_interval]]
 
|Specifies the interval in milliseconds that pings are sent to the other end of the connection (defaults to 500).
 
|-
 
|[[enet.peer:timeout | peer:timeout]]
 
|Returns or sets the parameters when a timeout is detected.
 
|-
 
|[[enet.peer:index | peer:index]]
 
|Returns the index of the peer.
 
|-
 
|[[enet.peer:state | peer:state]]
 
|Returns the state of the peer.
 
|-
 
|[[enet.peer:connect_id | peer:connect_id]]
 
|Returns the field ENetPeer::connectID that is assigned for each connection.
 
 
|-
 
|-
|[[enet.peer:round_trip_time | peer:round_trip_time]]
+
|[[enet.host_create | host_create]]
|Returns or sets the current round trip time (i.e. ping).
+
|Returns a new host.
 
|-
 
|-
|[[enet.peer:last_round_trip_time | peer:last_round_trip_time]]
+
|[[enet.linked_version| linked_version]]
|Returns or sets the round trip time of the previous round trip time computation.
+
|Returns the included ENet's version string.
 
|}
 
|}
  
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<source lang="Lua">
 
<source lang="Lua">
 
-- server.lua
 
-- server.lua
require "enet"
+
local enet = require "enet"
 
local host = enet.host_create("localhost:6789")
 
local host = enet.host_create("localhost:6789")
local event = host:service(100)
+
while true do
while event do
+
  local event = host:service(100)
  if event.type == "receive" then
+
  while event do
    print("Got message: ", event.data, event.peer)
+
    if event.type == "receive" then
    event.peer:send( "pong" )
+
      print("Got message: ", event.data, event.peer)
  elseif event.type == "connect" then
+
      event.peer:send( "pong" )
    print(event.peer .. " connected.")
+
    elseif event.type == "connect" then
  elseif event.type == "disconnect" then
+
      print(event.peer, "connected.")
    print(event.peer .. " disconnected.")
+
    elseif event.type == "disconnect" then
 +
      print(event.peer, "disconnected.")
 +
    end
 +
    event = host:service()
 
   end
 
   end
  event = host:service()
 
 
end
 
end
 
</source>
 
</source>
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<source lang="Lua">
 
<source lang="Lua">
 
-- client.lua
 
-- client.lua
require "enet"
+
local enet = require "enet"
 
local host = enet.host_create()
 
local host = enet.host_create()
 
local server = host:connect("localhost:6789")
 
local server = host:connect("localhost:6789")
local event = host:service(100)
+
while true do
while event do
+
  local event = host:service(100)
  if event.type == "receive" then
+
  while event do
    print("Got message: ", event.data, event.peer)
+
    if event.type == "receive" then
    event.peer:send( "ping" )
+
      print("Got message: ", event.data, event.peer)
  elseif event.type == "connect" then
+
      event.peer:send( "ping" )
    print(event.peer .. " connected.")
+
    elseif event.type == "connect" then
    event.peer:send( "ping" )
+
      print(event.peer, "connected.")
  elseif event.type == "disconnect" then
+
      event.peer:send( "ping" )
    print(event.peer .. " disconnected.")
+
    elseif event.type == "disconnect" then
 +
      print(event.peer, "disconnected.")
 +
    end
 +
    event = host:service()
 
   end
 
   end
  event = host:service()
 
 
end
 
end
 
</source>
 
</source>
 +
 +
This is another example that creates a server (receiver) and a client (sender) on the same computer with the same script. The client will say "Hi" to the server endlessly because ClientSend() is called inside love.update.
 +
 +
<source lang="Lua">
 +
enet = require "enet"
 +
 +
enethost = nil
 +
hostevent = nil
 +
clientpeer = nil
 +
 +
function love.load(args)
 +
 +
-- establish host for receiving msg
 +
enethost = enet.host_create("localhost:6750")
 +
 +
-- establish a connection to host on same PC
 +
enetclient = enet.host_create()
 +
        clientpeer = enetclient:connect("localhost:6750")
 +
 +
end
 +
 +
function love.update(dt)
 +
ServerListen()
 +
ClientSend()
 +
end
 +
 +
function love.draw()
 +
end
 +
 +
function ServerListen()
 +
 +
hostevent = enethost:service(100)
 +
 +
if hostevent then
 +
print("Server detected message type: " .. hostevent.type)
 +
if hostevent.type == "connect" then
 +
print(hostevent.peer, "connected.")
 +
end
 +
if hostevent.type == "receive" then
 +
print("Received message: ", hostevent.data, hostevent.peer)
 +
end
 +
end
 +
end
 +
 +
function ClientSend()
 +
enetclient:service(100)
 +
clientpeer:send("Hi")
 +
end
 +
</source>
 +
 +
== See Also ==
 +
* [[parent::love]]
 +
* [[socket]]
 +
== Other Languages ==
 +
{{i18n|lua-enet}}
 +
 +
[[Category:Libraries]]
 +
[[Category:ThirdParty]]
 +
{{#set:Description=Multiplayer networking module for games.}}
 +
{{#set:LOVE Version=0.9.0}}
 +
{{#set:Keyword=Networking}}

Latest revision as of 03:03, 5 July 2023

Available since LÖVE 0.9.0
This module is not supported in earlier versions.


O.png Official documentation for lua-enet is available here. ENet's features are listed on its homepage. The official documentation may have typos. The documentation on this wiki reflects Löve's implementation, meaning it should be safe to follow what's written here.  


lua-enet is simply some Lua bindings for ENet.

ENet's purpose is to provide a relatively thin, simple and robust network communication layer for games on top of UDP (User Datagram Protocol).The primary feature it provides is optional reliable, in-order delivery of packets.

ENet omits certain higher level networking features such as authentication, lobbying, server discovery, encryption, or other similar tasks that are particularly application specific so that the library remains flexible, portable, and easily embeddable.

Types

Type Description
host An ENet host for communicating with peers.
peer An ENet peer which data packets may be sent or received from.
event A simple table containing information on an event.

Functions

Function Description
host_create Returns a new host.
linked_version Returns the included ENet's version string.

Examples

server.lua

-- server.lua
local enet = require "enet"
local host = enet.host_create("localhost:6789")
while true do
  local event = host:service(100)
  while event do
    if event.type == "receive" then
      print("Got message: ", event.data, event.peer)
      event.peer:send( "pong" )
    elseif event.type == "connect" then
      print(event.peer, "connected.")
    elseif event.type == "disconnect" then
      print(event.peer, "disconnected.")
    end
    event = host:service()
  end
end

client.lua

-- client.lua
local enet = require "enet"
local host = enet.host_create()
local server = host:connect("localhost:6789")
while true do
  local event = host:service(100)
  while event do
    if event.type == "receive" then
      print("Got message: ", event.data, event.peer)
      event.peer:send( "ping" )
    elseif event.type == "connect" then
      print(event.peer, "connected.")
      event.peer:send( "ping" )
    elseif event.type == "disconnect" then
      print(event.peer, "disconnected.")
    end
    event = host:service()
  end
end

This is another example that creates a server (receiver) and a client (sender) on the same computer with the same script. The client will say "Hi" to the server endlessly because ClientSend() is called inside love.update.

enet = require "enet"

enethost = nil
hostevent = nil
clientpeer = nil

function love.load(args)

	-- establish host for receiving msg
	enethost = enet.host_create("localhost:6750")
	
	-- establish a connection to host on same PC
	enetclient = enet.host_create()
        clientpeer = enetclient:connect("localhost:6750")

end

function love.update(dt)
	ServerListen()	
	ClientSend()
end

function love.draw()
end

function ServerListen()

	hostevent = enethost:service(100)
	
	if hostevent then
		print("Server detected message type: " .. hostevent.type)
		if hostevent.type == "connect" then 
			print(hostevent.peer, "connected.")
		end
		if hostevent.type == "receive" then
			print("Received message: ", hostevent.data, hostevent.peer)
		end
	end
end

function ClientSend()
	enetclient:service(100)
	clientpeer:send("Hi")
end

See Also

Other Languages