# vim: set encoding=utf-8 et sw=4 sts=4 :
-from mako.template import Template
-from mako.runtime import Context
from os import path
-try:
- import cPickle as pickle
-except ImportError:
- import pickle
-
-try:
- from seqtools import Sequence
-except ImportError:
- # NOP for testing
- class Sequence: pass
-try:
- from dispatcher import Handler, handler, HandlerError
-except ImportError:
- # NOP for testing
- class HandlerError(RuntimeError): pass
- class Handler: pass
- def handler(help):
- def wrapper(f):
- return f
- return wrapper
+
+from seqtools import Sequence
+from dispatcher import Handler, handler, HandlerError
+from services.util import Restorable, ConfigWriter
+from services.util import InitdHandler, TransactionalHandler
__ALL__ = ('DhcpHandler', 'Error', 'HostError', 'HostAlreadyExistsError',
'HostNotFoundError', 'ParameterError', 'ParameterNotFoundError')
-pickle_ext = '.pkl'
-pickle_vars = 'vars'
-pickle_hosts = 'hosts'
-
-config_filename = 'dhcpd.conf'
-
-template_dir = path.join(path.dirname(__file__), 'templates')
-
class Error(HandlerError):
r"""
- Error(command) -> Error instance :: Base DhcpHandler exception class.
+ Error(message) -> Error instance :: Base DhcpHandler exception class.
All exceptions raised by the DhcpHandler inherits from this one, so you can
easily catch any DhcpHandler exception.
@handler(u'Get information about a host.')
def get(self, name):
- r"""get(name) -> CSV string :: List all the information of a host.
-
- The host is returned as a CSV list of: hostname,ip,mac
- """
+ r"get(name) -> Host :: List all the information of a host."
if not name in self.hosts:
raise HostNotFoundError(name)
return self.hosts[name]
@handler(u'List hosts.')
def list(self):
- r"""list() -> CSV string :: List all the hostnames.
-
- The list is returned as a single CSV line with all the hostnames.
- """
+ r"list() -> tuple :: List all the hostnames."
return self.hosts.keys()
@handler(u'Get information about all hosts.')
def show(self):
- r"""show() -> CSV string :: List all the complete hosts information.
-
- The hosts are returned as a CSV list with each host in a line, like:
- hostname,ip,mac
- """
+ r"show() -> list of Hosts :: List all the complete hosts information."
return self.hosts.values()
-class DhcpHandler(Handler):
+class DhcpHandler(Restorable, ConfigWriter, InitdHandler, TransactionalHandler):
r"""DhcpHandler([pickle_dir[, config_dir]]) -> DhcpHandler instance.
Handles DHCP service commands for the dhcpd program.
Both defaults to the current working directory.
"""
- def __init__(self, pickle_dir='.', config_dir='.'):
- r"Initialize DhcpHandler object, see class documentation for details."
- self.pickle_dir = pickle_dir
- self.config_dir = config_dir
- filename = path.join(template_dir, config_filename)
- self.template = Template(filename=filename)
- try:
- self._load()
- except IOError:
- # This is the first time the handler is used, create a basic
- # setup using some nice defaults
- self.hosts = dict()
- self.vars = dict(
+ _initd_name = 'dhcpd'
+
+ _persistent_vars = ('vars', 'hosts')
+
+ _restorable_defaults = dict(
+ hosts = dict(),
+ vars = dict(
domain_name = 'example.com',
dns_1 = 'ns1.example.com',
dns_2 = 'ns2.example.com',
net_start = '192.168.0.100',
net_end = '192.168.0.200',
net_gateway = '192.168.0.1',
- )
- self._dump()
- self._write_config()
+ ),
+ )
+
+ _config_writer_files = 'dhcpd.conf'
+ _config_writer_tpl_dir = path.join(path.dirname(__file__), 'templates')
+
+ def __init__(self, pickle_dir='.', config_dir='.'):
+ r"Initialize DhcpHandler object, see class documentation for details."
+ self._persistent_dir = pickle_dir
+ self._config_writer_cfg_dir = config_dir
+ self._config_build_templates()
+ self._restore()
self.host = HostHandler(self.hosts)
+ def _get_config_vars(self, config_file):
+ return dict(hosts=self.hosts.values(), **self.vars)
+
@handler(u'Set a DHCP parameter.')
def set(self, param, value):
r"set(param, value) -> None :: Set a DHCP parameter."
@handler(u'List all available DHCP parameters.')
def list(self):
- r"""list() -> CSV string :: List all the parameter names.
-
- The list is returned as a single CSV line with all the names.
- """
+ r"list() -> tuple :: List all the parameter names."
return self.vars.keys()
@handler(u'Get all DHCP parameters, with their values.')
def show(self):
- r"""show() -> CSV string :: List all the parameters (with their values).
-
- The parameters are returned as a CSV list with each parameter in a
- line, like:
- name,value
- """
+ r"show() -> (key, value) tuples :: List all the parameters."
return self.vars.items()
- @handler(u'Start the service.')
- def start(self):
- r"start() -> None :: Start the DHCP service."
- #esto seria para poner en una interfaz
- #y seria el hook para arrancar el servicio
- pass
-
- @handler(u'Stop the service.')
- def stop(self):
- r"stop() -> None :: Stop the DHCP service."
- #esto seria para poner en una interfaz
- #y seria el hook para arrancar el servicio
- pass
-
- @handler(u'Restart the service.')
- def restart(self):
- r"restart() -> None :: Restart the DHCP service."
- #esto seria para poner en una interfaz
- #y seria el hook para arrancar el servicio
- pass
-
- @handler(u'Reload the service config (without restarting, if possible).')
- def reload(self):
- r"reload() -> None :: Reload the configuration of the DHCP service."
- #esto seria para poner en una interfaz
- #y seria el hook para arrancar el servicio
- pass
-
- @handler(u'Commit the changes (reloading the service, if necessary).')
- def commit(self):
- r"commit() -> None :: Commit the changes and reload the DHCP service."
- #esto seria para poner en una interfaz
- #y seria que hace el pickle deberia llamarse
- #al hacerse un commit
- self._dump()
- self._write_config()
- self.reload()
-
- @handler(u'Discard all the uncommited changes.')
- def rollback(self):
- r"rollback() -> None :: Discard the changes not yet commited."
- self._load()
-
- def _dump(self):
- r"_dump() -> None :: Dump all persistent data to pickle files."
- # XXX podría ir en una clase base
- self._dump_var(self.vars, pickle_vars)
- self._dump_var(self.hosts, pickle_hosts)
-
- def _load(self):
- r"_load() -> None :: Load all persistent data from pickle files."
- # XXX podría ir en una clase base
- self.vars = self._load_var(pickle_vars)
- self.hosts = self._load_var(pickle_hosts)
-
- def _pickle_filename(self, name):
- r"_pickle_filename() -> string :: Construct a pickle filename."
- # XXX podría ir en una clase base
- return path.join(self.pickle_dir, name) + pickle_ext
-
- def _dump_var(self, var, name):
- r"_dump_var() -> None :: Dump a especific variable to a pickle file."
- # XXX podría ir en una clase base
- pkl_file = file(self._pickle_filename(name), 'wb')
- pickle.dump(var, pkl_file, 2)
- pkl_file.close()
-
- def _load_var(self, name):
- r"_load_var() -> object :: Load a especific pickle file."
- # XXX podría ir en una clase base
- return pickle.load(file(self._pickle_filename(name)))
-
- def _write_config(self):
- r"_write_config() -> None :: Generate all the configuration files."
- # XXX podría ir en una clase base, ver como generalizar variables a
- # reemplazar en la template
- out_file = file(path.join(self.config_dir, config_filename), 'w')
- ctx = Context(out_file, hosts=self.hosts.values(), **self.vars)
- self.template.render_context(ctx)
- out_file.close()
-
if __name__ == '__main__':
import os
- dhcp_handler = DhcpHandler()
+ h = DhcpHandler()
def dump():
print '-' * 80
- print 'Variables:', dhcp_handler.list()
- print dhcp_handler.show()
+ print 'Variables:', h.list()
+ print h.show()
print
- print 'Hosts:', dhcp_handler.host.list()
- print dhcp_handler.host.show()
+ print 'Hosts:', h.host.list()
+ print h.host.show()
print '-' * 80
dump()
- dhcp_handler.host.add('my_name','192.168.0.102','00:12:ff:56')
+ h.host.add('my_name','192.168.0.102','00:12:ff:56')
- dhcp_handler.host.update('my_name','192.168.0.192','00:12:ff:56')
+ h.host.update('my_name','192.168.0.192','00:12:ff:56')
- dhcp_handler.host.add('nico','192.168.0.188','00:00:00:00')
+ h.host.add('nico','192.168.0.188','00:00:00:00')
- dhcp_handler.set('domain_name','baryon.com.ar')
+ h.set('domain_name','baryon.com.ar')
try:
- dhcp_handler.set('sarasa','baryon.com.ar')
+ h.set('sarasa','baryon.com.ar')
except KeyError, e:
print 'Error:', e
- dhcp_handler.commit()
+ h.commit()
dump()
- for f in (pickle_vars + pickle_ext, pickle_hosts + pickle_ext,
- config_filename):
- os.unlink(f)
+ os.system('rm -f *.pkl ' + ' '.join(h._config_writer_files))
projects / software / pymin.git / blobdiff