Request Lua Variable from Webserver

[rickd]

I use the following to send events to webserver ajax_sendevent.lhtml?event=digitalout&device=232

how would i request a variable like that in the scripting html example

scripting.lhtml

would this work

ajax_scripting.lhtml?variable=_VERSION

The variable would then be returned in the webpage

Thanks

[rickd]

ajaxreq.lhtml?Data=_VERSION

This works now i can get any variable back nice

[Tieske8]

Here's some other code that might help

[rickd]

This code looksninteresting ...so currently to get an update I have to request the lua variable using the http request this then returns data to irule.
How can I make the variable be updated and pushed from girder via apolling approach?

Will this code enable this update without any chAnge on client side or need for http request to b pushed from client first

[shaun5]

HTTP servers function via client requests, so there is no way to push data to a HTTP client without a request. To allow Girder to push updates to iRule, iRule would need to support something like a TCP connection or receive UDP broadcast.

[rickd]

Ok thanks that is what I thought ....so is there a simple tcp example showing data output out of a port. I just want to send simple text from a port irule can b configured to listen to that ip address and port.

So I need code to setup port to send data out that port as this will enable girder to push updates to irule

Thanks in advance

[shaun5]

In the manual, there is an example for a socket that echos telnet requests. iRule needs to initiate the request, so Girder doesn't have to hunt for devices to send the broadcasts. Let me know if you need help with the lua code...

[rickd]

Great thanks that works well just need a little more help.

How do i make it so that I can send data from girder that I want rather than just echo the data sent from irule or terminal as both work.

I need a way to add pushing my data out to the irule client or terminal ..I know that it can just not sure how to do that. Can you provide example?

function mycbserver(p1,p2)
			if ( p2 == transport.constants.event.CONNECTIONCLOSED ) then
				print("Connection Closed")
				return
			end
	if ( p2 == transport.constants.event.NEWCONNECTION ) then
				print("New Incoming Connection")
				p1:Callback(transport.constants.parser.TERMINATED,'\n', 3000, function (cp1,cp2)
		if ( cp2 == transport.constants.event.CONNECTIONCLOSED ) then
				print("Client Connection Closed")
				table.print(clients[p1])
				p1:Close()
				clients[p1]=nil
				return
			end
	if ( cp2 == transport.constants.event.CONNECTIONESTABLISHED ) then
			if ( cp1 == 0 ) then
				print("New Client Connection")
				p1:Write("welcome to our echo telnet server!\r\n")
				clients[p1]=true
				
			else
				print("New Client Connection Failed: ")
				p1:Close()
				clients[p1]=nil
			end
		return
	end
		print(cp1)
		
		p1:Write(cp1 .. '\r\n')
	end)
	return
	end
end
if ( clients ) then
	for c,v in pairs(clients ) do
	c:Close()
	end
end
if ( c5 ) then
	c5:Close()
end
clients = {}
	c5 = transport.New(transport.constants.transport.GIPLISTEN)
if not c5:Open(nil, 12345) then
	print('Could not start listening')
	c5:Close();
	c5 = nil;
end
c5:Callback(transport.constants.parser.TERMINATED, '\r\n', 1000, mycbserver)
print('Listening for connections on port 12345, use telnet localhost 12345 from the commandline')

thanks Rick

[shaun5]

If I remember the example correctly, it builds a table of connections, so a separate script action like should give you a broadcast to all the connected devices:
<code>
for i in clients do
if (clients[i] ~= nil) then
i:Write("status update...")
end
end
</code>

[rickd]

Thanks it seems that table is blank it is not working? see code in post above. The table print returns {-- #0 } --#0