process

[José]

I have a farm with 4 web servers.
I want to write a client-server program to rotate logs.
Basically the server has only one file, if I run it, the server listens.
The client has 2 files, one client and another server.
If the log is greater than xxx bytes, then the client send a message to
the server, then the server send another message to all the webservers,
and they must to rotate logs.
I'm too new in Python and I don't know a lot of modules, so the problem
is: how can I know which processes are running?.
I writed all, but I want that the "client server" look at the processes.
In case it's rotating logs, it must pause all. In bash it could be:

#ps ax|grep rotatelogs

But how in Python?

thanks in advance

[Ryan Paul]

Re: process

On Wed, 12 May 2004 12:33:16 +0200, José wrote:
[color=blue]
> I have a farm with 4 web servers.
> I want to write a client-server program to rotate logs.
> Basically the server has only one file, if I run it, the server listens.
> The client has 2 files, one client and another server.
> If the log is greater than xxx bytes, then the client send a message to
> the server, then the server send another message to all the webservers,
> and they must to rotate logs.
> I'm too new in Python and I don't know a lot of modules, so the problem
> is: how can I know which processes are running?.
> I writed all, but I want that the "client server" look at the processes.
> In case it's rotating logs, it must pause all. In bash it could be:
>
> #ps ax|grep rotatelogs
>
> But how in Python?
>
> thanks in advance[/color]

I'm not aware of any way to retrieve the process list from python, but you
might try this:

import commands

x = commands.getsta tusoutput('ps ax|grep rotatelogs')[1]

[José]

Re: process


Thank you, finally I write a pid file when rotatelogs starts, and I
delete it when it stops, then with isfile() I know if the process is
working.

Ryan Paul escribió:
[color=blue]
>
>
>
> I'm not aware of any way to retrieve the process list from python, but you
> might try this:
>
> import commands
>
> x = commands.getsta tusoutput('ps ax|grep rotatelogs')[1][/color]

[José]

connexion to all the servers


Now the problem is different.
I can do the first part, and is good, but if I try to send a message
from server to the clients, I can only send the first message, and can't
the other three.
Here I have the code.

Code from client (first request):

#!/usr/bin/env python
from socket import *
import sys
from os.path import *
from os import *
sock = socket(AF_INET, SOCK_STREAM)
sock.connect((' 192.168.4.115', 6969))
tm = str(getsize("/var/log/apache2/access_log"))
message = tm

if ( tm > 50 ):
sock.send(messa ge)

sock.close()

Code from server (second request):

#!/usr/bin/env python
from SocketServer import BaseRequestHand ler, TCPServer
from socket import *
import sys

class manejador(BaseR equestHandler):
def handle(self):
print "Conected Client: ", self.client_add ress
datos = self.request.re cv(4096)
self.request.cl ose()
print "los datos: ", datos
while ( datos != 0 ):
a=['172.26.0.138', '192.168.4.111' ,'192.168.4.112 ',
'192.168.4.113' ,'192.168.4.114 ']
for i in range(len(a)):
web = a[i]
sock = socket(AF_INET, SOCK_STREAM)
sock.connect((w eb, 6970))
message = "adelante"
sock.send(messa ge)
sock.close()


TCPServer((('', 6969)), manejador).serv e_forever()


and this is the client server script, the last:

!/usr/bin/env python
from SocketServer import BaseRequestHand ler, TCPServer
import sys, socket
from os.path import *
from os import *

class manejador(BaseR equestHandler):
def handle(self):
print "Cliente Conectado: ", self.client_add ress
datos = self.request.re cv(4096)
self.request.cl ose()
archivo = isfile("./rotatelogs")
if ( archivo == False ):
print "success"
else:
print "errorrrr"


TCPServer((('', 6970)), manejador).serv e_forever()