X-Git-Url: https://git.llucax.com/software/pymin.git/blobdiff_plain/c9db2312caca9ab1bd655a74bdcb29680b70cbb1..HEAD:/services/dhcp/__init__.py diff --git a/services/dhcp/__init__.py b/services/dhcp/__init__.py index d7c185c..8f9581f 100644 --- a/services/dhcp/__init__.py +++ b/services/dhcp/__init__.py @@ -1,350 +1,17 @@ # 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 dispatcher import handler -except ImportError: - def handler(f): return f # NOP for testing - -__ALL__ = ('DhcpHandler',) - -pickle_ext = '.pkl' -pickle_vars = 'vars' -pickle_hosts = 'hosts' - -config_filename = 'dhcpd.conf' - -template_dir = path.join(path.dirname(__file__), 'templates') - -class Error(RuntimeError): - r""" - Error(command) -> Error instance :: Base DhcpHandler exception class. - - All exceptions raised by the DhcpHandler inherits from this one, so you can - easily catch any DhcpHandler exception. - - message - A descriptive error message. - """ - - def __init__(self, message): - r"Initialize the Error object. See class documentation for more info." - self.message = message - - def __str__(self): - return self.message - -class HostError(Error, KeyError): - r""" - HostError(hostname) -> HostError instance - - This is the base exception for all host related errors. - """ - - def __init__(self, hostname): - r"Initialize the object. See class documentation for more info." - self.message = 'Host error: "%s"' % hostname - -class HostAlreadyExistsError(HostError): - r""" - HostAlreadyExistsError(hostname) -> HostAlreadyExistsError instance - - This exception is raised when trying to add a hostname that already exists. - """ - - def __init__(self, hostname): - r"Initialize the object. See class documentation for more info." - self.message = 'Host already exists: "%s"' % hostname - -class HostNotFoundError(HostError): - r""" - HostNotFoundError(hostname) -> HostNotFoundError instance - - This exception is raised when trying to operate on a hostname that doesn't - exists. - """ - - def __init__(self, hostname): - r"Initialize the object. See class documentation for more info." - self.message = 'Host not found: "%s"' % hostname - -class ParameterError(Error, KeyError): - r""" - ParameterError(paramname) -> ParameterError instance - - This is the base exception for all DhcpHandler parameters related errors. - """ - - def __init__(self, paramname): - r"Initialize the object. See class documentation for more info." - self.message = 'Parameter error: "%s"' % paramname - -class ParameterNotFoundError(ParameterError): - r""" - ParameterNotFoundError(hostname) -> ParameterNotFoundError instance - - This exception is raised when trying to operate on a parameter that doesn't - exists. - """ - - def __init__(self, paramname): - r"Initialize the object. See class documentation for more info." - self.message = 'Parameter not found: "%s"' % paramname - - -class Host: - r"""Host(name, ip, mac) -> Host instance :: Class representing a host. - - name - Host name, should be a fully qualified name, but no checks are done. - ip - IP assigned to the hostname. - mac - MAC address to associate to the hostname. - """ - - def __init__(self, name, ip, mac): - r"Initialize Host object, see class documentation for details." - self.name = name - self.ip = ip - self.mac = mac - -class HostHandler: - r"""HostHandler(hosts) -> HostHandler instance :: Handle a list of hosts. - - This class is a helper for DhcpHandler to do all the work related to hosts - administration. - - hosts - A dictionary with string keys (hostnames) and Host instances values. - """ - - def __init__(self, hosts): - r"Initialize HostHandler object, see class documentation for details." - self.hosts = hosts - - @handler - def add(self, name, ip, mac): - r"add(name, ip, mac) -> None :: Add a host to the hosts list." - if name in self.hosts: - raise HostAlreadyExistsError(name) - self.hosts[name] = Host(name, ip, mac) - - @handler - def update(self, name, ip=None, mac=None): - r"update(name[, ip[, mac]]) -> None :: Update a host of the hosts list." - if not name in self.hosts: - raise HostNotFoundError(name) - if ip is not None: - self.hosts[name].ip = ip - if mac is not None: - self.hosts[name].mac = mac - - @handler - def delete(self, name): - r"delete(name) -> None :: Delete a host of the hosts list." - if not name in self.hosts: - raise HostNotFoundError(name) - del self.hosts[name] - - @handler - def list(self): - r"""list() -> CSV string :: List all the hostnames. - - The list is returned as a single CSV line with all the hostnames. - """ - return ','.join(self.hosts) - - @handler - 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 - """ - hosts = self.hosts.values() - return '\n'.join('%s,%s,%s' % (h.name, h.ip, h.mac) for h in hosts) - -class DhcpHandler: - r"""DhcpHandler([pickle_dir[, config_dir]]) -> DhcpHandler instance. - - Handles DHCP service commands for the dhcpd program. - - pickle_dir - Directory where to write the persistent configuration data. - - config_dir - Directory where to store de generated configuration files. - - 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( - domain_name = 'example.com', - dns_1 = 'ns1.example.com', - dns_2 = 'ns2.example.com', - net_address = '192.168.0.0', - net_mask = '255.255.255.0', - net_start = '192.168.0.100', - net_end = '192.168.0.200', - net_gateway = '192.168.0.1', - ) - self._dump() - self._write_config() - self.host = HostHandler(self.hosts) - - @handler - def set(self, param, value): - r"set(param, value) -> None :: Set a DHCP parameter." - if not param in self.vars: - raise ParameterNotFoundError(param) - self.vars[param] = value - - @handler - 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. - """ - return ','.join(self.vars) - - @handler - 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 - """ - return '\n'.join(('%s,%s' % (k, v) for (k, v) in self.vars.items())) - - @handler - 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 - 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 - 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 - 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 - 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 - 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() - - def dump(): - print '-' * 80 - print 'Variables:', dhcp_handler.list() - print dhcp_handler.show() - print - print 'Hosts:', dhcp_handler.host.list() - print dhcp_handler.host.show() - print '-' * 80 - - dump() - - dhcp_handler.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') - - dhcp_handler.host.add('nico','192.168.0.188','00:00:00:00') - - dhcp_handler.set('domain_name','baryon.com.ar') - - try: - dhcp_handler.set('sarasa','baryon.com.ar') - except KeyError, e: - print 'Error:', e - - dhcp_handler.commit() - - dump() - - for f in (pickle_vars + pickle_ext, pickle_hosts + pickle_ext, - config_filename): - os.unlink(f) +from formencode import validators as V +from pymin.config import Option +from handler import DhcpHandler + +def setup_service(options, config): + options.add_group('dhcp', 'DHCP service', [ + Option('pickle_dir', V.String, metavar='DIR', + help='store persistent data in DIR directory'), + Option('config_dir', V.String, metavar='DIR', + help='write config file in DIR directory'), + ]) + +def get_service(config): + return DhcpHandler(config.dhcp.pickle_dir, config.dhcp.config_dir)