X-Git-Url: https://git.llucax.com/software/pymin.git/blobdiff_plain/8b148a195996b9bdc46f1f12b9ba9fb0b6a99714..196ed3f27decb8cf21dd398fe3e27c7f7461b719:/pymin/services/util.py diff --git a/pymin/services/util.py b/pymin/services/util.py index 8d3775e..acb9539 100644 --- a/pymin/services/util.py +++ b/pymin/services/util.py @@ -8,17 +8,22 @@ try: import cPickle as pickle except ImportError: import pickle +import logging ; log = logging.getLogger('pymin.services.util') from pymin.dispatcher import Handler, handler, HandlerError, \ CommandNotFoundError +from pymin.seqtools import Sequence #DEBUG = False DEBUG = True -__ALL__ = ('ServiceHandler', 'InitdHandler', 'SubHandler', 'DictSubHandler', - 'ListSubHandler', 'Persistent', 'ConfigWriter', 'Error', - 'ReturnNot0Error', 'ExecutionError', 'ItemError', - 'ItemAlreadyExistsError', 'ItemNotFoundError', '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""" @@ -31,22 +36,6 @@ class Error(HandlerError): """ pass -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 __unicode__(self): - return 'The command returned %d' % self.return_value - class ExecutionError(Error): r""" ExecutionError(command, error) -> ExecutionError instance. @@ -116,7 +105,7 @@ class ItemAlreadyExistsError(ItemError): class ItemNotFoundError(ItemError): r""" - ItemNotFoundError(key) -> ItemNotFoundError instance + ItemNotFoundError(key) -> ItemNotFoundError instance. This exception is raised when trying to operate on an item that doesn't exists. @@ -126,23 +115,113 @@ class ItemNotFoundError(ItemError): 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. @@ -199,14 +278,22 @@ class 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): @@ -250,24 +337,28 @@ class Restorable(Persistent): 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: @@ -330,6 +421,7 @@ class ConfigWriter: 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') \ @@ -354,6 +446,8 @@ class ConfigWriter: 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): @@ -384,8 +478,11 @@ class ConfigWriter: vars = dict() elif callable(vars): vars = vars(template_name) - f = file(self._get_config_path(template_name, 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() @@ -395,7 +492,7 @@ class ConfigWriter: 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 @@ -422,32 +519,114 @@ class ServiceHandler(Handler): 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. -class InitdHandler(Handler): + 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(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 @@ -472,30 +651,29 @@ class InitdHandler(Handler): 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. @@ -516,17 +694,28 @@ class TransactionalHandler(Handler): @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): @@ -550,31 +739,41 @@ 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): @@ -588,6 +787,7 @@ class SubHandler(Handler): 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): @@ -617,161 +817,397 @@ class ContainerSubHandler(SubHandler): 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 _cont(self): - return getattr(self.parent, self._cont_subhandler_attr) + 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 _vcont(self): - if isinstance(self._cont(), dict): - return dict([(k, i) for (k, i) in self._cont().items() + 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._cont() + 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._cont(), dict): + if isinstance(self._attr(), dict): key = item.as_tuple()[0] # do we have the same item? then raise an error - if key in self._vcont(): + 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._cont(): + if key in self._attr(): + log.debug(u'ContainerSubHandler.add: was deleted, undeleting it') index = key - if not isinstance(self._cont(), dict): - index = self._cont().index(item) + if not isinstance(self._attr(), dict): + index = self._attr().index(item) if hasattr(item, '_add'): - self._cont()[index]._add = False + self._attr()[index]._add = False if hasattr(item, '_delete'): - self._cont()[index]._delete = False + self._attr()[index]._delete = False else: # it's *really* new - if isinstance(self._cont(), dict): - self._cont()[key] = item + if isinstance(self._attr(), dict): + self._attr()[key] = item else: - self._cont().append(item) + 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. - # TODO check if the modified item is the same of an existing one - if not isinstance(self._cont(), dict): + 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._vcont()[index] + 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 IndexError: + 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." - if not isinstance(self._cont(), dict): + log.debug(u'ContainerSubHandler.delete(%r)', index) + if not isinstance(self._attr(), dict): index = int(index) # TODO validation try: - item = self._vcont()[index] + 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._cont()[index] + del self._attr()[index] return item - except IndexError: + 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." - if not isinstance(self._cont(), dict): + log.debug(u'ContainerSubHandler.get(%r)', index) + if not isinstance(self._attr(), dict): index = int(index) # TODO validation try: - return self._vcont()[index] - except IndexError: + 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." - if isinstance(self._cont(), dict): - return self._cont().values() - return self._vcont() + 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. - This is a helper class to inherit from to automatically handle subcommands - that operates over a list parent attribute. - - The list 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(ListSubHandler): - _cont_subhandler_attr = 'some_list' - _cont_subhandler_class = SomeClass - - This way, the parent's some_list attribute (self.parent.some_list) will be - managed automatically, providing the commands: add, update, delete, get, - list and show. New items will be instances of SomeClass, which should - provide a cmp operator to see if the item is on the list 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 list, but it's not listed either). + 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." - return len(self._vcont()) + log.debug(u'ListContainerSubHandler.len()') + return len(self._vattr()) class DictSubHandler(ContainerSubHandler): r"""DictSubHandler(parent) -> DictSubHandler instance. - This is a helper class to inherit from to automatically handle subcommands - that operates over a dict parent attribute. + ContainerSubHandler holding dicts. See ComposedSubHandler documentation + for details. + """ - The dict 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: + @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(DictSubHandler): - _cont_subhandler_attr = 'some_dict' - _cont_subhandler_class = SomeClass + class TestHandler(ComposedSubHandler): + _comp_subhandler_cont = 'some_cont' + _comp_subhandler_attr = 'some_attr' + _comp_subhandler_class = SomeClass - This way, the parent's some_dict attribute (self.parent.some_dict) will be - managed automatically, providing the commands: add, update, delete, get, - list and show. New items will be instances of SomeClass, which should - provide a constructor with at least the key value, an as_tuple() method - and an update() method, if it should be possible to modify + 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 dict, but it's - not listed either). + (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): - r"list() -> tuple :: List all the item keys." - return self._cont().keys() + 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') @@ -874,3 +1310,5 @@ if __name__ == '__main__': os.rmdir('templates') print + print get_network_devices() +