import cPickle as pickle
except ImportError:
import pickle
+import logging ; log = logging.getLogger('pymin.services.util')
-from pymin.dispatcher import Handler, handler, HandlerError
+from pymin.dispatcher import Handler, handler, HandlerError, \
+ CommandNotFoundError
+from pymin.seqtools import Sequence
-DEBUG = False
-#DEBUG = True
+#DEBUG = False
+DEBUG = True
-__ALL__ = ('ServiceHandler', 'InitdHandler', 'Persistent', 'ConfigWriter',
- 'Error', 'ReturnNot0Error', 'ExecutionError', 'call')
+__ALL__ = ('Error', 'ExecutionError', 'ItemError', 'ItemAlreadyExistsError',
+ 'ItemNotFoundError', 'ContainerError', 'ContainerNotFoundError',
+ 'call', 'get_network_devices', 'Persistent', 'Restorable',
+ 'ConfigWriter', 'ServiceHandler', 'RestartHandler',
+ 'ReloadHandler', 'InitdHandler', 'SubHandler', 'DictSubHandler',
+ 'ListSubHandler', 'ComposedSubHandler', 'ListComposedSubHandler',
+ 'DictComposedSubHandler', 'Device','Address')
class Error(HandlerError):
r"""
message - A descriptive error message.
"""
-
- def __init__(self, message):
- r"Initialize the object. See class documentation for more info."
- self.message = message
-
- def __str__(self):
- return self.message
-
-class ReturnNot0Error(Error):
- r"""
- ReturnNot0Error(return_value) -> ReturnNot0Error instance.
-
- A command didn't returned the expected 0 return value.
-
- return_value - Return value returned by the command.
- """
-
- def __init__(self, return_value):
- r"Initialize the object. See class documentation for more info."
- self.return_value = return_value
-
- def __str__(self):
- return 'The command returned %d' % self.return_value
+ pass
class ExecutionError(Error):
r"""
self.command = command
self.error = error
- def __str__(self):
+ def __unicode__(self):
command = self.command
if not isinstance(self.command, basestring):
command = ' '.join(command)
class ParameterNotFoundError(ParameterError):
r"""
- ParameterNotFoundError(hostname) -> ParameterNotFoundError instance
+ ParameterNotFoundError(paramname) -> ParameterNotFoundError instance
This exception is raised when trying to operate on a parameter that doesn't
exists.
r"Initialize the object. See class documentation for more info."
self.message = 'Parameter not found: "%s"' % paramname
+class ItemError(Error, KeyError):
+ r"""
+ ItemError(key) -> ItemError instance.
+
+ This is the base exception for all item related errors.
+ """
+
+ def __init__(self, key):
+ r"Initialize the object. See class documentation for more info."
+ self.message = u'Item error: "%s"' % key
+
+class ItemAlreadyExistsError(ItemError):
+ r"""
+ ItemAlreadyExistsError(key) -> ItemAlreadyExistsError instance.
+
+ This exception is raised when trying to add an item that already exists.
+ """
+
+ def __init__(self, key):
+ r"Initialize the object. See class documentation for more info."
+ self.message = u'Item already exists: "%s"' % key
+
+class ItemNotFoundError(ItemError):
+ r"""
+ ItemNotFoundError(key) -> ItemNotFoundError instance.
+
+ This exception is raised when trying to operate on an item that doesn't
+ exists.
+ """
+
+ def __init__(self, key):
+ r"Initialize the object. See class documentation for more info."
+ self.message = u'Item not found: "%s"' % key
+
+class ContainerError(Error, KeyError):
+ r"""
+ ContainerError(key) -> ContainerError instance.
+
+ This is the base exception for all container related errors.
+ """
+
+ def __init__(self, key):
+ r"Initialize the object. See class documentation for more info."
+ self.message = u'Container error: "%s"' % key
+
+class ContainerNotFoundError(ContainerError):
+ r"""
+ ContainerNotFoundError(key) -> ContainerNotFoundError instance.
+
+ This exception is raised when trying to operate on an container that
+ doesn't exists.
+ """
+
+ def __init__(self, key):
+ r"Initialize the object. See class documentation for more info."
+ self.message = u'Container not found: "%s"' % key
+
+class Address(Sequence):
+ def __init__(self, ip, netmask, broadcast=None, peer=None):
+ self.ip = ip
+ self.netmask = netmask
+ self.broadcast = broadcast
+ self.peer = peer
+ def update(self, netmask=None, broadcast=None):
+ if netmask is not None: self.netmask = netmask
+ if broadcast is not None: self.broadcast = broadcast
+ def as_tuple(self):
+ return (self.ip, self.netmask, self.broadcast, self.peer)
+
+
+class Device(Sequence):
+ def __init__(self, name, mac, ppp):
+ self.name = name
+ self.mac = mac
+ self.ppp = ppp
+ self.active = True
+ self.addrs = dict()
+ self.routes = list()
+ def as_tuple(self):
+ return (self.name, self.mac, self.active, self.addrs)
+
+
+
+def get_network_devices():
+ p = subprocess.Popen(('ip', '-o', 'link'), stdout=subprocess.PIPE,
+ close_fds=True)
+ string = p.stdout.read()
+ p.wait()
+ d = dict()
+ devices = string.splitlines()
+ for dev in devices:
+ mac = ''
+ if dev.find('link/ether') != -1:
+ i = dev.find('link/ether')
+ mac = dev[i+11 : i+11+17]
+ i = dev.find(':')
+ j = dev.find(':', i+1)
+ name = dev[i+2: j]
+ d[name] = Device(name,mac,False)
+ elif dev.find('link/ppp') != -1:
+ i = dev.find('link/ppp')
+ mac = '00:00:00:00:00:00'
+ i = dev.find(':')
+ j = dev.find(':', i+1)
+ name = dev[i+2 : j]
+ d[name] = Device(name,mac,True)
+ #since the device is ppp, get the address and peer
+ try:
+ p = subprocess.Popen(('ip', '-o', 'addr', 'show', name), stdout=subprocess.PIPE,
+ close_fds=True, stderr=subprocess.PIPE)
+ string = p.stdout.read()
+ p.wait()
+ addrs = string.splitlines()
+ inet = addrs[1].find('inet')
+ peer = addrs[1].find('peer')
+ bar = addrs[1].find('/')
+ from_addr = addrs[1][inet+5 : peer-1]
+ to_addr = addrs[1][peer+5 : bar]
+ d[name].addrs[from_addr] = Address(from_addr,24, peer=to_addr)
+ except IndexError:
+ pass
+ return d
+
+def get_peers():
+ p = subprocess.Popen(('ip', '-o', 'addr'), stdout=subprocess.PIPE,
+ close_fds=True)
def call(command, stdin=subprocess.PIPE, stdout=subprocess.PIPE,
stderr=subprocess.PIPE, close_fds=True, universal_newlines=True,
**kw):
+ log.debug(u'call(%r)', command)
if DEBUG:
- if not isinstance(command, basestring):
- command = ' '.join(command)
- print 'Executing command:', command
+ log.debug(u'call: not really executing, DEBUG mode')
return
try:
- r = subprocess.call(command, stdin=stdin, stdout=stdout, stderr=stderr,
- universal_newlines=universal_newlines,
- close_fds=close_fds, **kw)
+ subprocess.check_call(command, stdin=stdin, stdout=stdout,
+ stderr=stderr, close_fds=close_fds,
+ universal_newlines=universal_newlines, **kw)
except Exception, e:
+ log.debug(u'call: Execution error %r', e)
raise ExecutionError(command, e)
- if r is not 0:
- raise ExecutionError(command, ReturnNot0Error(r))
class Persistent:
r"""Persistent([attrs[, dir[, ext]]]) -> Persistent.
def _dump_attr(self, attrname):
r"_dump_attr() -> None :: Dump a specific variable to a pickle file."
+ fname = self._pickle_filename(attrname)
+ attr = getattr(self, attrname)
+ log.debug(u'Persistent._dump_attr(%r) -> file=%r, value=%r',
+ attrname, fname, attr)
f = file(self._pickle_filename(attrname), 'wb')
- pickle.dump(getattr(self, attrname), f, 2)
+ pickle.dump(attr, f, 2)
f.close()
def _load_attr(self, attrname):
r"_load_attr() -> object :: Load a specific pickle file."
- f = file(self._pickle_filename(attrname))
- setattr(self, attrname, pickle.load(f))
+ fname = self._pickle_filename(attrname)
+ f = file(fname)
+ attr = pickle.load(f)
+ log.debug(u'Persistent._load_attr(%r) -> file=%r, value=%r',
+ attrname, fname, attr)
+ setattr(self, attrname, attr)
f.close()
def _pickle_filename(self, name):
def _restore(self):
r"_restore() -> bool :: Restore persistent data or create a default."
+ log.debug(u'Restorable._restore()')
try:
+ log.debug(u'Restorable._restore: trying to load...')
self._load()
- # TODO tener en cuenta servicios que hay que levantar y los que no
- if hasattr(self, 'commit'): # TODO deberia ser reload y/o algo para comandos
- self.commit()
+ log.debug(u'Restorable._restore: load OK')
return True
except IOError:
+ log.debug(u'Restorable._restore: load FAILED, making defaults: %r',
+ self._restorable_defaults)
for (k, v) in self._restorable_defaults.items():
setattr(self, k, v)
# TODO tener en cuenta servicios que hay que levantar y los que no
if hasattr(self, 'commit'):
+ log.debug(u'Restorable._restore: commit() found, commiting...')
self.commit()
return False
+ log.debug(u'Restorable._restore: dumping new defaults...')
self._dump()
if hasattr(self, '_write_config'):
+ log.debug(u'Restorable._restore: _write_config() found, '
+ u'writing new config...')
self._write_config()
- if hasattr(self, 'reload'):
- self.reload()
return False
class ConfigWriter:
class TestHandler(ConfigWriter):
_config_writer_files = ('base.conf', 'custom.conf')
- _config_writer_cfg_dir = '/etc/service'
+ _config_writer_cfg_dir = {
+ 'base.conf': '/etc/service',
+ 'custom.conf': '/etc/service/conf.d',
+ }
_config_writer_tpl_dir = 'templates'
The generated configuration files directory defaults to '.' and the
templates directory to 'templates'. _config_writer_files has no default and
must be specified in either way. It can be string or a tuple if more than
- one configuration file must be generated.
+ one configuration file must be generated. _config_writer_cfg_dir could be a
+ dict mapping which file should be stored in which directory, or a single
+ string if all the config files should go to the same directory.
The template filename and the generated configuration filename are both the
same (so if you want to generate some /etc/config, you should have some
templates/config template). That's why _config_writer_cfg_dir and
- _config_writer_tpl_dir can't be the same.
+ _config_writer_tpl_dir can't be the same. This is not true for very
+ specific cases where _write_single_config() is used.
When you write your Handler, you should call _config_build_templates() in
you Handler constructor to build the templates.
def _config_build_templates(self):
r"_config_writer_templates() -> None :: Build the template objects."
+ log.debug(u'ConfigWriter.build_templates()')
if isinstance(self._config_writer_files, basestring):
self._config_writer_files = (self._config_writer_files,)
if not hasattr(self, '_config_writer_templates') \
vars = dict()
elif callable(vars):
vars = vars(template_name)
+ log.debug(u'ConfigWriter._render_config: rendering template %r with '
+ u'vars=%r', template_name, vars)
return self._config_writer_templates[template_name].render(**vars)
+ def _get_config_path(self, template_name, config_filename=None):
+ r"Get a complete configuration path."
+ if not config_filename:
+ config_filename = template_name
+ if isinstance(self._config_writer_cfg_dir, basestring):
+ return path.join(self._config_writer_cfg_dir, config_filename)
+ return path.join(self._config_writer_cfg_dir[template_name],
+ config_filename)
+
def _write_single_config(self, template_name, config_filename=None, vars=None):
r"""_write_single_config(template_name[, config_filename[, vars]]).
variables to replace in the templates, if not, it looks for a
_get_config_vars() method to get it.
"""
- if not config_filename:
- config_filename = template_name
if vars is None:
if hasattr(self, '_get_config_vars'):
vars = self._get_config_vars(template_name)
vars = dict()
elif callable(vars):
vars = vars(template_name)
- f = file(path.join(self._config_writer_cfg_dir, config_filename), 'w')
+ fname = self._get_config_path(template_name, config_filename)
+ f = file(fname, 'w')
ctx = Context(f, **vars)
+ log.debug(u'ConfigWriter._write_single_config: rendering template '
+ u'%r with vars=%r to file %r', template_name, vars, fname)
self._config_writer_templates[template_name].render_context(ctx)
f.close()
self._write_single_config(t)
-class ServiceHandler(Handler):
+class ServiceHandler(Handler, Restorable):
r"""ServiceHandler([start[, stop[, restart[, reload]]]]) -> ServiceHandler.
This is a helper class to inherit from to automatically handle services
def __init__(self, start=None, stop=None, restart=None, reload=None):
r"Initialize the object, see the class documentation for details."
+ log.debug(u'ServiceHandler(%r, %r, %r, %r)', start, stop, restart,
+ reload)
for (name, action) in dict(start=start, stop=stop, restart=restart,
reload=reload).items():
if action is not None:
- setattr(self, '_service_%s' % name, action)
+ attr_name = '_service_%s' % name
+ log.debug(u'ServiceHandler: using %r as %s', attr_name, action)
+ setattr(self, attr_name, action)
+ self._persistent_attrs = list(self._persistent_attrs)
+ self._persistent_attrs.append('_service_running')
+ if '_service_running' not in self._restorable_defaults:
+ self._restorable_defaults['_service_running'] = False
+ log.debug(u'ServiceHandler: restoring service configuration...')
+ self._restore()
+ if self._service_running:
+ log.debug(u'ServiceHandler: service was running, starting it...')
+ self._service_running = False
+ self.start()
@handler(u'Start the service.')
def start(self):
r"start() -> None :: Start the service."
- call(self._service_start)
+ log.debug(u'ServiceHandler.start()')
+ if not self._service_running:
+ log.debug(u'ServiceHandler.start: not running, starting it...')
+ if callable(self._service_start):
+ self._service_start()
+ else:
+ call(self._service_start)
+ self._service_running = True
+ self._dump_attr('_service_running')
@handler(u'Stop the service.')
def stop(self):
+ log.debug(u'ServiceHandler.stop()')
r"stop() -> None :: Stop the service."
- call(self._service_stop)
+ if self._service_running:
+ log.debug(u'ServiceHandler.stop: running, stoping it...')
+ if callable(self._service_stop):
+ self._service_stop()
+ else:
+ call(self._service_stop)
+ self._service_running = False
+ self._dump_attr('_service_running')
@handler(u'Restart the service.')
def restart(self):
r"restart() -> None :: Restart the service."
- call(self._service_restart)
+ log.debug(u'ServiceHandler.restart()')
+ if callable(self._service_restart):
+ self._service_restart()
+ else:
+ call(self._service_restart)
+ self._service_running = True
+ self._dump_attr('_service_running')
@handler(u'Reload the service config (without restarting, if possible).')
def reload(self):
r"reload() -> None :: Reload the configuration of the service."
- call(self._service_reload)
+ log.debug(u'ServiceHandler.reload()')
+ if self._service_running:
+ log.debug(u'ServiceHandler.reload: running, reloading...')
+ if callable(self._service_reload):
+ self._service_reload()
+ else:
+ call(self._service_reload)
+
+ @handler(u'Tell if the service is running.')
+ def running(self):
+ r"reload() -> None :: Reload the configuration of the service."
+ log.debug(u'ServiceHandler.running() -> %r', self._service_running)
+ if self._service_running:
+ return 1
+ else:
+ return 0
+
+class RestartHandler(Handler):
+ r"""RestartHandler() -> RestartHandler :: Provides generic restart command.
+
+ This is a helper class to inherit from to automatically add a restart
+ command that first stop the service and then starts it again (using start
+ and stop commands respectively).
+ """
+
+ @handler(u'Restart the service (alias to stop + start).')
+ def restart(self):
+ r"restart() -> None :: Restart the service calling stop() and start()."
+ log.debug(u'RestartHandler.restart()')
+ self.stop()
+ self.start()
+
+class ReloadHandler(Handler):
+ r"""ReloadHandler() -> ReloadHandler :: Provides generic reload command.
+
+ This is a helper class to inherit from to automatically add a reload
+ command that calls restart.
+ """
+
+ @handler(u'Reload the service config (alias to restart).')
+ def reload(self):
+ r"reload() -> None :: Reload the configuration of the service."
+ log.debug(u'ReloadHandler.reload()')
+ if hasattr(self, '_service_running') and self._service_running:
+ log.debug(u'ReloadHandler.reload: running, reloading...')
+ self.restart()
-class InitdHandler(Handler):
+class InitdHandler(ServiceHandler):
+ # TODO update docs, declarative style is depracated
r"""InitdHandler([initd_name[, initd_dir]]) -> InitdHandler.
This is a helper class to inherit from to automatically handle services
def __init__(self, initd_name=None, initd_dir=None):
r"Initialize the object, see the class documentation for details."
+ log.debug(u'InitdHandler(%r, %r)', initd_name, initd_dir)
if initd_name is not None:
self._initd_name = initd_name
if initd_dir is not None:
self._initd_dir = initd_dir
-
- @handler(u'Start the service.')
- def start(self):
- r"start() -> None :: Start the service."
- call((path.join(self._initd_dir, self._initd_name), 'start'))
-
- @handler(u'Stop the service.')
- def stop(self):
- r"stop() -> None :: Stop the service."
- call((path.join(self._initd_dir, self._initd_name), 'stop'))
-
- @handler(u'Restart the service.')
- def restart(self):
- r"restart() -> None :: Restart the service."
- call((path.join(self._initd_dir, self._initd_name), 'restart'))
-
- @handler(u'Reload the service config (without restarting, if possible).')
- def reload(self):
- r"reload() -> None :: Reload the configuration of the service."
- call((path.join(self._initd_dir, self._initd_name), 'reload'))
+ actions = dict()
+ for action in ('start', 'stop', 'restart', 'reload'):
+ actions[action] = (path.join(self._initd_dir, self._initd_name),
+ action)
+ ServiceHandler.__init__(self, **actions)
+
+ def handle_timer(self):
+ # TODO documentation
+ log.debug(u'InitdHandler.handle_timer(): self=%r', self)
+ p = subprocess.Popen(('pgrep', '-f', self._initd_name),
+ stdout=subprocess.PIPE)
+ pid = p.communicate()[0]
+ if p.returncode == 0 and len(pid) > 0:
+ log.debug(u'InitdHandler.handle_timer: pid present, running')
+ self._service_running = True
+ else:
+ log.debug(u'InitdHandler.handle_timer: pid absent, NOT running')
+ self._service_running = False
class TransactionalHandler(Handler):
r"""Handle command transactions providing a commit and rollback commands.
@handler(u'Commit the changes (reloading the service, if necessary).')
def commit(self):
r"commit() -> None :: Commit the changes and reload the service."
+ log.debug(u'TransactionalHandler.commit()')
if hasattr(self, '_dump'):
+ log.debug(u'TransactionalHandler.commit: _dump() present, '
+ u'dumping...')
self._dump()
+ unchanged = False
if hasattr(self, '_write_config'):
- self._write_config()
- if hasattr(self, 'reload'):
+ log.debug(u'TransactionalHandler.commit: _write_config() present, '
+ u'writing config...')
+ unchanged = self._write_config()
+ if not unchanged and hasattr(self, 'reload'):
+ log.debug(u'TransactionalHandler.commit: reload() present, and'
+ u'configuration changed, reloading...')
self.reload()
@handler(u'Discard all the uncommited changes.')
def rollback(self):
r"rollback() -> None :: Discard the changes not yet commited."
+ log.debug(u'TransactionalHandler.reload()')
if hasattr(self, '_load'):
+ log.debug(u'TransactionalHandler.reload: _load() present, loading'
+ u'pickled values...')
self._load()
class ParametersHandler(Handler):
def __init__(self, attr=None):
r"Initialize the object, see the class documentation for details."
+ log.debug(u'ParametersHandler(%r)', attr)
if attr is not None:
self._parameters_attr = attr
@handler(u'Set a service parameter.')
def set(self, param, value):
r"set(param, value) -> None :: Set a service parameter."
+ log.debug(u'ParametersHandler.set(%r, %r)', param, value)
if not param in self.params:
+ log.debug(u'ParametersHandler.set: parameter not found')
raise ParameterNotFoundError(param)
self.params[param] = value
+ if hasattr(self, '_update'):
+ log.debug(u'ParametersHandler.set: _update found, setting to True')
+ self._update = True
@handler(u'Get a service parameter.')
def get(self, param):
r"get(param) -> None :: Get a service parameter."
+ log.debug(u'ParametersHandler.get(%r)', param)
if not param in self.params:
+ log.debug(u'ParametersHandler.get: parameter not found')
raise ParameterNotFoundError(param)
return self.params[param]
@handler(u'List all available service parameters.')
def list(self):
r"list() -> tuple :: List all the parameter names."
+ log.debug(u'ParametersHandler.list()')
return self.params.keys()
@handler(u'Get all service parameters, with their values.')
def show(self):
r"show() -> (key, value) tuples :: List all the parameters."
+ log.debug(u'ParametersHandler.show()')
return self.params.items()
+class SubHandler(Handler):
+ r"""SubHandler(parent) -> SubHandler instance :: Handles subcommands.
+
+ This is a helper class to build sub handlers that needs to reference the
+ parent handler.
+
+ parent - Parent Handler object.
+ """
+
+ def __init__(self, parent):
+ r"Initialize the object, see the class documentation for details."
+ log.debug(u'SubHandler(%r)', parent)
+ self.parent = parent
+
+class ContainerSubHandler(SubHandler):
+ r"""ContainerSubHandler(parent) -> ContainerSubHandler instance.
+
+ This is a helper class to implement ListSubHandler and DictSubHandler. You
+ should not use it directly.
+
+ The container attribute to handle and the class of objects that it
+ contains can be defined by calling the constructor or in a more declarative
+ way as class attributes, like:
+
+ class TestHandler(ContainerSubHandler):
+ _cont_subhandler_attr = 'some_cont'
+ _cont_subhandler_class = SomeClass
+
+ This way, the parent's some_cont attribute (self.parent.some_cont)
+ will be managed automatically, providing the commands: add, update,
+ delete, get and show. New items will be instances of SomeClass,
+ which should provide a cmp operator to see if the item is on the
+ container and an update() method, if it should be possible to modify
+ it. If SomeClass has an _add, _update or _delete attribute, it set
+ them to true when the item is added, updated or deleted respectively
+ (in case that it's deleted, it's not removed from the container,
+ but it's not listed either).
+ """
+
+ def __init__(self, parent, attr=None, cls=None):
+ r"Initialize the object, see the class documentation for details."
+ log.debug(u'ContainerSubHandler(%r, %r, %r)', parent, attr, cls)
+ self.parent = parent
+ if attr is not None:
+ self._cont_subhandler_attr = attr
+ if cls is not None:
+ self._cont_subhandler_class = cls
+
+ def _attr(self, attr=None):
+ if attr is None:
+ return getattr(self.parent, self._cont_subhandler_attr)
+ setattr(self.parent, self._cont_subhandler_attr, attr)
+
+ def _vattr(self):
+ if isinstance(self._attr(), dict):
+ return dict([(k, i) for (k, i) in self._attr().items()
+ if not hasattr(i, '_delete') or not i._delete])
+ return [i for i in self._attr()
+ if not hasattr(i, '_delete') or not i._delete]
+
+ @handler(u'Add a new item')
+ def add(self, *args, **kwargs):
+ r"add(...) -> None :: Add an item to the list."
+ log.debug(u'ContainerSubHandler.add(%r, %r)', args, kwargs)
+ item = self._cont_subhandler_class(*args, **kwargs)
+ if hasattr(item, '_add'):
+ log.debug(u'ContainerSubHandler.add: _add found, setting to True')
+ item._add = True
+ key = item
+ if isinstance(self._attr(), dict):
+ key = item.as_tuple()[0]
+ # do we have the same item? then raise an error
+ if key in self._vattr():
+ log.debug(u'ContainerSubHandler.add: allready exists')
+ raise ItemAlreadyExistsError(item)
+ # do we have the same item, but logically deleted? then update flags
+ if key in self._attr():
+ log.debug(u'ContainerSubHandler.add: was deleted, undeleting it')
+ index = key
+ if not isinstance(self._attr(), dict):
+ index = self._attr().index(item)
+ if hasattr(item, '_add'):
+ self._attr()[index]._add = False
+ if hasattr(item, '_delete'):
+ self._attr()[index]._delete = False
+ else: # it's *really* new
+ if isinstance(self._attr(), dict):
+ self._attr()[key] = item
+ else:
+ self._attr().append(item)
+
+ @handler(u'Update an item')
+ def update(self, index, *args, **kwargs):
+ r"update(index, ...) -> None :: Update an item of the container."
+ log.debug(u'ContainerSubHandler.update(%r, %r, %r)',
+ index, args, kwargs)
+ # TODO make it right with metaclasses, so the method is not created
+ # unless the update() method really exists.
+ if not isinstance(self._attr(), dict):
+ index = int(index) # TODO validation
+ if not hasattr(self._cont_subhandler_class, 'update'):
+ log.debug(u'ContainerSubHandler.update: update() not found, '
+ u"can't really update, raising command not found")
+ raise CommandNotFoundError(('update',))
+ try:
+ item = self._vattr()[index]
+ item.update(*args, **kwargs)
+ if hasattr(item, '_update'):
+ log.debug(u'ContainerSubHandler.update: _update found, '
+ u'setting to True')
+ item._update = True
+ except LookupError:
+ log.debug(u'ContainerSubHandler.update: item not found')
+ raise ItemNotFoundError(index)
+
+ @handler(u'Delete an item')
+ def delete(self, index):
+ r"delete(index) -> None :: Delete an item of the container."
+ log.debug(u'ContainerSubHandler.delete(%r)', index)
+ if not isinstance(self._attr(), dict):
+ index = int(index) # TODO validation
+ try:
+ item = self._vattr()[index]
+ if hasattr(item, '_delete'):
+ log.debug(u'ContainerSubHandler.delete: _delete found, '
+ u'setting to True')
+ item._delete = True
+ else:
+ del self._attr()[index]
+ return item
+ except LookupError:
+ log.debug(u'ContainerSubHandler.delete: item not found')
+ raise ItemNotFoundError(index)
+
+ @handler(u'Remove all items (use with care).')
+ def clear(self):
+ r"clear() -> None :: Delete all items of the container."
+ log.debug(u'ContainerSubHandler.clear()')
+ # FIXME broken really, no _delete attribute is setted :S
+ if isinstance(self._attr(), dict):
+ self._attr.clear()
+ else:
+ self._attr(list())
+
+ @handler(u'Get information about an item')
+ def get(self, index):
+ r"get(index) -> item :: List all the information of an item."
+ log.debug(u'ContainerSubHandler.get(%r)', index)
+ if not isinstance(self._attr(), dict):
+ index = int(index) # TODO validation
+ try:
+ return self._vattr()[index]
+ except LookupError:
+ log.debug(u'ContainerSubHandler.get: item not found')
+ raise ItemNotFoundError(index)
+
+ @handler(u'Get information about all items')
+ def show(self):
+ r"show() -> list of items :: List all the complete items information."
+ log.debug(u'ContainerSubHandler.show()')
+ if isinstance(self._attr(), dict):
+ return self._attr().values()
+ return self._vattr()
+
+class ListSubHandler(ContainerSubHandler):
+ r"""ListSubHandler(parent) -> ListSubHandler instance.
+
+ ContainerSubHandler holding lists. See ComposedSubHandler documentation
+ for details.
+ """
+
+ @handler(u'Get how many items are in the list')
+ def len(self):
+ r"len() -> int :: Get how many items are in the list."
+ log.debug(u'ListContainerSubHandler.len()')
+ return len(self._vattr())
+
+class DictSubHandler(ContainerSubHandler):
+ r"""DictSubHandler(parent) -> DictSubHandler instance.
+
+ ContainerSubHandler holding dicts. See ComposedSubHandler documentation
+ for details.
+ """
+
+ @handler(u'List all the items by key')
+ def list(self):
+ r"list() -> tuple :: List all the item keys."
+ log.debug(u'DictContainerSubHandler.list()')
+ return self._attr().keys()
+
+class ComposedSubHandler(SubHandler):
+ r"""ComposedSubHandler(parent) -> ComposedSubHandler instance.
+
+ This is a helper class to implement ListComposedSubHandler and
+ DictComposedSubHandler. You should not use it directly.
+
+ This class is usefull when you have a parent that has a dict (cont)
+ that stores some object that has an attribute (attr) with a list or
+ a dict of objects of some class. In that case, this class provides
+ automated commands to add, update, delete, get and show that objects.
+ This commands takes the cont (key of the dict for the object holding
+ the attr), and an index for access the object itself (in the attr
+ list/dict).
+
+ The container object (cont) that holds a containers, the attribute of
+ that object that is the container itself, and the class of the objects
+ that it contains can be defined by calling the constructor or in a
+ more declarative way as class attributes, like:
+
+ class TestHandler(ComposedSubHandler):
+ _comp_subhandler_cont = 'some_cont'
+ _comp_subhandler_attr = 'some_attr'
+ _comp_subhandler_class = SomeClass
+
+ This way, the parent's some_cont attribute (self.parent.some_cont)
+ will be managed automatically, providing the commands: add, update,
+ delete, get and show for manipulating a particular instance that holds
+ of SomeClass. For example, updating an item at the index 5 is the same
+ (simplified) as doing parent.some_cont[cont][5].update().
+ SomeClass should provide a cmp operator to see if the item is on the
+ container and an update() method, if it should be possible to modify
+ it. If SomeClass has an _add, _update or _delete attribute, it set
+ them to true when the item is added, updated or deleted respectively
+ (in case that it's deleted, it's not removed from the container,
+ but it's not listed either). If the container objects
+ (parent.some_cont[cont]) has an _update attribute, it's set to True
+ when any add, update or delete command is executed.
+ """
+
+ def __init__(self, parent, cont=None, attr=None, cls=None):
+ r"Initialize the object, see the class documentation for details."
+ log.debug(u'ComposedSubHandler(%r, %r, %r, %r)',
+ parent, cont, attr, cls)
+ self.parent = parent
+ if cont is not None:
+ self._comp_subhandler_cont = cont
+ if attr is not None:
+ self._comp_subhandler_attr = attr
+ if cls is not None:
+ self._comp_subhandler_class = cls
+
+ def _cont(self):
+ return getattr(self.parent, self._comp_subhandler_cont)
+
+ def _attr(self, cont, attr=None):
+ if attr is None:
+ return getattr(self._cont()[cont], self._comp_subhandler_attr)
+ setattr(self._cont()[cont], self._comp_subhandler_attr, attr)
+
+ def _vattr(self, cont):
+ if isinstance(self._attr(cont), dict):
+ return dict([(k, i) for (k, i) in self._attr(cont).items()
+ if not hasattr(i, '_delete') or not i._delete])
+ return [i for i in self._attr(cont)
+ if not hasattr(i, '_delete') or not i._delete]
+
+ @handler(u'Add a new item')
+ def add(self, cont, *args, **kwargs):
+ r"add(cont, ...) -> None :: Add an item to the list."
+ log.debug(u'ComposedSubHandler.add(%r, %r, %r)', cont, args, kwargs)
+ if not cont in self._cont():
+ log.debug(u'ComposedSubHandler.add: container not found')
+ raise ContainerNotFoundError(cont)
+ item = self._comp_subhandler_class(*args, **kwargs)
+ if hasattr(item, '_add'):
+ log.debug(u'ComposedSubHandler.add: _add found, setting to True')
+ item._add = True
+ key = item
+ if isinstance(self._attr(cont), dict):
+ key = item.as_tuple()[0]
+ # do we have the same item? then raise an error
+ if key in self._vattr(cont):
+ log.debug(u'ComposedSubHandler.add: allready exists')
+ raise ItemAlreadyExistsError(item)
+ # do we have the same item, but logically deleted? then update flags
+ if key in self._attr(cont):
+ log.debug(u'ComposedSubHandler.add: was deleted, undeleting it')
+ index = key
+ if not isinstance(self._attr(cont), dict):
+ index = self._attr(cont).index(item)
+ if hasattr(item, '_add'):
+ self._attr(cont)[index]._add = False
+ if hasattr(item, '_delete'):
+ self._attr(cont)[index]._delete = False
+ else: # it's *really* new
+ if isinstance(self._attr(cont), dict):
+ self._attr(cont)[key] = item
+ else:
+ self._attr(cont).append(item)
+ if hasattr(self._cont()[cont], '_update'):
+ log.debug(u"ComposedSubHandler.add: container's _update found, "
+ u'setting to True')
+ self._cont()[cont]._update = True
+
+ @handler(u'Update an item')
+ def update(self, cont, index, *args, **kwargs):
+ r"update(cont, index, ...) -> None :: Update an item of the container."
+ # TODO make it right with metaclasses, so the method is not created
+ # unless the update() method really exists.
+ log.debug(u'ComposedSubHandler.update(%r, %r, %r, %r)',
+ cont, index, args, kwargs)
+ if not cont in self._cont():
+ log.debug(u'ComposedSubHandler.add: container not found')
+ raise ContainerNotFoundError(cont)
+ if not isinstance(self._attr(cont), dict):
+ index = int(index) # TODO validation
+ if not hasattr(self._comp_subhandler_class, 'update'):
+ log.debug(u'ComposedSubHandler.update: update() not found, '
+ u"can't really update, raising command not found")
+ raise CommandNotFoundError(('update',))
+ try:
+ item = self._vattr(cont)[index]
+ item.update(*args, **kwargs)
+ if hasattr(item, '_update'):
+ log.debug(u'ComposedSubHandler.update: _update found, '
+ u'setting to True')
+ item._update = True
+ if hasattr(self._cont()[cont], '_update'):
+ log.debug(u"ComposedSubHandler.add: container's _update found, "
+ u'setting to True')
+ self._cont()[cont]._update = True
+ except LookupError:
+ log.debug(u'ComposedSubHandler.update: item not found')
+ raise ItemNotFoundError(index)
+
+ @handler(u'Delete an item')
+ def delete(self, cont, index):
+ r"delete(cont, index) -> None :: Delete an item of the container."
+ log.debug(u'ComposedSubHandler.delete(%r, %r)', cont, index)
+ if not cont in self._cont():
+ log.debug(u'ComposedSubHandler.add: container not found')
+ raise ContainerNotFoundError(cont)
+ if not isinstance(self._attr(cont), dict):
+ index = int(index) # TODO validation
+ try:
+ item = self._vattr(cont)[index]
+ if hasattr(item, '_delete'):
+ log.debug(u'ComposedSubHandler.delete: _delete found, '
+ u'setting to True')
+ item._delete = True
+ else:
+ del self._attr(cont)[index]
+ if hasattr(self._cont()[cont], '_update'):
+ log.debug(u"ComposedSubHandler.add: container's _update found, "
+ u'setting to True')
+ self._cont()[cont]._update = True
+ return item
+ except LookupError:
+ log.debug(u'ComposedSubHandler.delete: item not found')
+ raise ItemNotFoundError(index)
+
+ @handler(u'Remove all items (use with care).')
+ def clear(self, cont):
+ r"clear(cont) -> None :: Delete all items of the container."
+ # FIXME broken really, no item or container _delete attribute is
+ # setted :S
+ log.debug(u'ComposedSubHandler.clear(%r)', cont)
+ if not cont in self._cont():
+ log.debug(u'ComposedSubHandler.add: container not found')
+ raise ContainerNotFoundError(cont)
+ if isinstance(self._attr(cont), dict):
+ self._attr(cont).clear()
+ else:
+ self._attr(cont, list())
+
+ @handler(u'Get information about an item')
+ def get(self, cont, index):
+ r"get(cont, index) -> item :: List all the information of an item."
+ log.debug(u'ComposedSubHandler.get(%r, %r)', cont, index)
+ if not cont in self._cont():
+ log.debug(u'ComposedSubHandler.add: container not found')
+ raise ContainerNotFoundError(cont)
+ if not isinstance(self._attr(cont), dict):
+ index = int(index) # TODO validation
+ try:
+ return self._vattr(cont)[index]
+ except LookupError:
+ log.debug(u'ComposedSubHandler.get: item not found')
+ raise ItemNotFoundError(index)
+
+ @handler(u'Get information about all items')
+ def show(self, cont):
+ r"show(cont) -> list of items :: List all the complete items information."
+ log.debug(u'ComposedSubHandler.show(%r)', cont)
+ if not cont in self._cont():
+ log.debug(u'ComposedSubHandler.add: container not found')
+ raise ContainerNotFoundError(cont)
+ if isinstance(self._attr(cont), dict):
+ return self._attr(cont).values()
+ return self._vattr(cont)
+
+class ListComposedSubHandler(ComposedSubHandler):
+ r"""ListComposedSubHandler(parent) -> ListComposedSubHandler instance.
+
+ ComposedSubHandler holding lists. See ComposedSubHandler documentation
+ for details.
+ """
+
+ @handler(u'Get how many items are in the list')
+ def len(self, cont):
+ r"len(cont) -> int :: Get how many items are in the list."
+ log.debug(u'ListComposedSubHandler.len(%r)', cont)
+ if not cont in self._cont():
+ raise ContainerNotFoundError(cont)
+ return len(self._vattr(cont))
+
+class DictComposedSubHandler(ComposedSubHandler):
+ r"""DictComposedSubHandler(parent) -> DictComposedSubHandler instance.
+
+ ComposedSubHandler holding dicts. See ComposedSubHandler documentation
+ for details.
+ """
+
+ @handler(u'List all the items by key')
+ def list(self, cont):
+ r"list(cont) -> tuple :: List all the item keys."
+ log.debug(u'DictComposedSubHandler.list(%r)', cont)
+ if not cont in self._cont():
+ raise ContainerNotFoundError(cont)
+ return self._attr(cont).keys()
+
if __name__ == '__main__':
+ logging.basicConfig(
+ level = logging.DEBUG,
+ format = '%(asctime)s %(levelname)-8s %(message)s',
+ datefmt = '%H:%M:%S',
+ )
+
+ import sys
+
# Execution tests
class STestHandler1(ServiceHandler):
_service_start = ('service', 'start')
os.rmdir('templates')
print
+ print get_network_devices()
+
projects / software / pymin.git / blobdiff