dproxify is a object daemon proxifier for GNU/Linux (Python 3.x), released under the terms of GPL3 license.

Description

A custom object is loaded into a detached daemon which communicate with clients (one at a time) through AFUnix sockets. With some exceptions (this is an alpha project), every call to object's methods through client is executed/computed on the daemon.

NOTE: dproxify uses pickle to send serialized objects over sockets.

As an example:

code:

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.




import sys
import os

from dproxify import dproxify


if len(sys.argv) < 2:
        sys.exit()


class Custom:
        string_cls = 'CLASS ATTR'

        def __init__(self, string):
                        self.string = string

        def process(self, a):
                        return a

        @classmethod
        def clsmethod(cls, a):
                        a + 456
                        return a

        def __str__(self):
                        return 'CUSTOM'



custom = Custom('my custom object')


if sys.argv[1] == 'start_daemon':
        print('Starting daemon')

        logfd    = os.open(path='LOG_FILE',    flags=(os.O_CREAT | os.O_WRONLY | os.O_APPEND), mode=0o600)
        errlogfd = os.open(path='ERRLOG_FILE', flags=(os.O_CREAT | os.O_WRONLY), mode=0o600)

        try:
                ### this sets up all: create daemon, load custom object, etc.
                dproxify.daemonize_object(obj=custom, sockpath='DAEMON_SOCKET', pidfile='PID_FILE', fds=(None, logfd, errlogfd))

        except dproxify.DaemonIsAlredyRunningException as e:
                print('Daemon is alredy running with the PID of %d' % e.pid)

        sys.exit()


## here, the client request a proxy object for our custom object (on the same socket path).
## raise_exceptions (defaults to False), raises the possible exceptions encountered
## in the custom object code, instead of returning them as a simple output.

proxy = dproxify.get_proxy_object('DAEMON_SOCKET', raise_exceptions=True)

print(proxy.string_cls)
print(proxy)
print(proxy.process('SVEVO'))

try:
        print(proxy.clsmethod('NUMBER'))
except TypeError as e:
        print('Error!')


## _stop_daemon() is a special command
## used by the proxy to shutdown the daemon

print(proxy._stop_daemon())
print('Exiting client')