[ale] Py[h]hon syntax (sic)

[Christopher Fowler]

Here is my WIP code.   I'm converting an agent I wrote in perl that
checks the database for our embedded devices in the field.  It then does
a ping to see if they are available.  The perl agent does more in the
fact that it will email the admin and also store states in the db. So it
will check every 5 minutes on a host and then email the admin every 60
minutes until the host is back up.  The thing I hate about the perl
agent is that it round robins the list.  That is no good so I will
either convert it to do a fork() on each object or I'll use threads.  Is
there threads in python?  I think in Perl threads are not really threads
as they would be in C.  

chop up this code and tell me how it can be better:


--- Cut Here --- Cut Here ----------------------------------------------

#!/usr/bin/env python

import sys;
import MySQLdb;
import os;
import re;

class Ens:
  def set_name(self, name):
    self.name = name;
  def set_id(self, id):
    self.id = id;
  def set_ip(self, ip):
    self.ip = ip;
  def get_name(self):
    return self.name;
  def get_id(self):
    return self.id;
  def get_ip(self):
    return self.ip;


def ping(ip, tries = 2):
  my_re = re.compile('(\w|\W)+ (\d) received, (\w|\W)+')
  for attempt in range(tries):
    ping_in, ping_out = os.popen2("ping -c 1 %s" % ip)
    for line in ping_out:
      rec_match = my_re.match(line)
      if not rec_match: continue
      received = int(rec_match.groups()[1])
      if not received: continue
      return attempt + 1

  return False


class Application:
  def main(self):
    db = MySQLdb.connect(host="127.0.0.1", user="cms", passwd="cms",
db="AC_OUTPOST");
    c = db.cursor();
    c.execute("select * from ens");
    ENS = [ ];

    while True:
      row = c.fetchone();
      if not row: break;
      e = Ens();
      e.set_name(row[2]);
      e.set_id(row[0]);
      e.set_ip(row[5]);
      ENS.append(e);

    for tmp in ENS:
     result = ping(tmp.get_ip());
     if not result:
       print "ID:",tmp.get_id()," Name:",tmp.get_name()," DOWN!";
    else:
       print "ID:",tmp.get_id()," Name:",tmp.get_name()," UP!";


program = Application();
program.main();

# vi: set ts=2 sw=2: #

--- Cut Here --- Cut Here ----------------------------------------------

How do I set the object constructor so that I can simply create an Ens
object with all the information needed?  Is it possible to simply pass
the whole row into the constructor?

I read in the O'reilly book "Learning Python" that the code can be
compiled into a .pyc file.  How do I compile into .pyc so that I can
distribute the code without the source being seen?  This is one of my
biggest problems with Perl.

Thanks,
Chris


On Thu, 2005-01-27 at 14:49, John P. Healey wrote:
> the code for pinging would look something like this:
> 
> import os
> import re
> 
> def ping(ip, tries = 2):
>     my_re = re.compile('(\w|\W)+ (\d) received, (\w|\W)+')
>     for attempt in range(tries):
>         ping_in, ping_out = os.popen2("ping -c 1 %s" % ip)
>         for line in ping_out:
>             rec_match = my_re.match(line)
>             if not rec_match: continue
>             received = int(rec_match.groups()[1])
>             if not received: continue
>             return attempt + 1
>     return False
> 
> it takes an optional second argument (# of tries) and returns the number of
> tries needed when successful, False otherwise.  the SMTP stuff can be handled
> with smtplib.  it's part of the standard library.  the main python site has
> pretty good documentation on this, including example code:
> 
> http://docs.python.org/lib/module-smtplib.html
> 
> 
> 5265762e204a6f686e6e79204865616c6579
> 
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