Call with async method

Ruby
1

Hi @all

I’m developing a tool who sniff the networktraffic on the nic. I would
like to call the method asynchron from a other pc. I realize this
problem with xmlrpc4r. To sniff the networkpackets, I use the pcaplet.

Now, I want to stop the sniffing method also at the remote side. The
idea is to set a global flag $state to boolean false. But it doesn’t run
correctly. You can see below the code from the remote class.

Thanks for helping…

Sniffing class______

class Sniffer
$state = true

def start_sniffing
@pcaplet = Pcaplet.new("-i eth0")
# …and so on…

for pkt in @pcaplet
  puts pkt.time
  break if $state == false # stop sniffing
end

end

def stop_sniffing
$state = false
end
end

2

K. R. wrote:

Thanks for helping…
for pkt in @pcaplet
puts pkt.time
break if $state == false # stop sniffing
end
end

def stop_sniffing
$state = false
end
end

Not sure why you want a global for this. Wouldn’t it be better to set
an @state instance variable in Sniffer’s initialize method, and refer to
that in start_sniffing and stop_sniffing?

3

2007/11/17, Alex Y. [email protected]:

Not sure why you want a global for this. Wouldn’t it be better to set
an @state instance variable in Sniffer’s initialize method, and refer to
that in start_sniffing and stop_sniffing?

Definitively. And also: KR, where do you do the sniffing? Is it in
Pcaplet’s constructor? In that case the flag would be useless.

Cheers

robert

4

Definitively. And also: KR, where do you do the sniffing? Is it in
Pcaplet’s constructor? In that case the flag would be useless.

No, I don’t sniff in the constructor. But with xmlrpc4r, I have a big
problem. When I want to start the Serverapplication (server =
XMLRPC::Server.new(ip, “/RPC2”, 20000) and call the serve method, my
application needs 20 seconds to start correctly. After the starting
phase, all response of connection-requests have a delay to 20 seconds.

5

Ugly. Did you find out where the time is spent? Is using DRb an
option?

yeah the problem is in the serve method from xmlrpc4r. It takes 20
seconds to establish a tcpserver. Now, I’m using the DRb option. But it
seems like the same problem.

6

2007/11/19, K. R. [email protected]:

Definitively. And also: KR, where do you do the sniffing? Is it in
Pcaplet’s constructor? In that case the flag would be useless.

No, I don’t sniff in the constructor. But with xmlrpc4r, I have a big
problem. When I want to start the Serverapplication (server =
XMLRPC::Server.new(ip, “/RPC2”, 20000) and call the serve method, my
application needs 20 seconds to start correctly. After the starting
phase, all response of connection-requests have a delay to 20 seconds.

Ugly. Did you find out where the time is spent? Is using DRb an
option?

Cheers

robert

7

2007/11/19, K. R. [email protected]:

Ugly. Did you find out where the time is spent? Is using DRb an
option?

yeah the problem is in the serve method from xmlrpc4r. It takes 20
seconds to establish a tcpserver. Now, I’m using the DRb option. But it
seems like the same problem.

Sounds as if you either have a networking issue (slow DNS loopups?) or
you have a fundamental design issue (i.e. starting a server too
often).

My 0.02EUR…

robert