cosockets for beginners
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- Subject: cosockets for beginners
- From: PA <petite.abeille@...>
- Date: Tue, 8 Mar 2005 16:26:56 +0100
Hello,
After much sleepless nights staring at Messieurs Carregal and Guerra's
Copas library... I finally gathered enough courage to devise my own
concoction :)
It basically does pretty the same thing as Copas, but in a much more
verbose way :P
Here is a short example to illustrate the implementation of a dumb
'echo' server:
-- Start the server on port number 2000
SocketServer.new( "*", 2000, aDelegate ).start()
-- Start the run loop
SocketRunLoop.default().run()
The server implementation is handled by the delegate's run() method,
which gets invoked when a client connect to the server:
this.run = function( aTask, aServer, aReader, aWriter )
while ( true ) do
local aValue = aReader.read()
if ( aValue ~= nil ) then
aWriter.writeln( "echo: " ..
string.format( "%q", aValue ) )
if ( aValue == "quit" ) then
aWriter.writeln( "echo: byebye"
)
aReader.close()
break
end
end
aTask.yield()
end
end
The 4 parameters to the run() method are as fellow:
- 'aTask' represents the coroutine the method is running in.
- 'aServer' represents the server which invoked this delegate.
- 'aReader' is an asynchronous wrapper around socket:receive().
- 'aWriter' is an asynchronous wrapper around socket:send().
That's pretty much it.
Gory details bellow:
http://dev.alt.textdrive.com/file/lu/SocketServer.lua
http://dev.alt.textdrive.com/file/lu/SocketRunLoop.lua
http://dev.alt.textdrive.com/file/lu/SocketTask.lua
http://dev.alt.textdrive.com/file/lu/SocketReader.lua
http://dev.alt.textdrive.com/file/lu/SocketWriter.lua
Comments, opinions, slappings warmly welcome :)
Cheers
--
PA, Onnay Equitursay
http://alt.textdrive.com/