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#-*- coding: utf-8 -*-
# applications.py
# Manager for applications file
#
# Copyright (C) 2016 Jakub Kadlcik
#
# This copyrighted material is made available to anyone wishing to use,
# modify, copy, or redistribute it subject to the terms and conditions of
# the GNU General Public License v.2, or (at your option) any later version.
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY expressed or implied, including the implied warranties 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, write to the
# Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.
#
from __future__ import absolute_import
from xml.dom import minidom
from xml.parsers.expat import ExpatError
from tracer.paths import DATA_DIR, USER_CONFIG_DIRS
from tracer.resources.exceptions import PathNotFound, TracerError
from tracer.resources.collections import ApplicationsCollection
from tracer.resources.lang import _
from tracer.resources.processes import Processes
from tracer.resources.system import System
from tracer.resources.SystemdDbus import SystemdDbus
from tracer.resources.pycomp import lru_cache
import os
import re
class Applications(object):
DEFINITIONS = map(lambda x: x + "/applications.xml", [DATA_DIR] + USER_CONFIG_DIRS)
TYPES = {
"DAEMON" : "daemon",
"STATIC" : "static",
"SESSION" : "session",
"APPLICATION" : "application",
"ERASED" : "erased",
"UNDEF" : "undefined" #Internal only
}
DEFAULT_TYPE = TYPES["APPLICATION"]
_apps = None
@staticmethod
def find(app_name):
if not Applications._apps:
Applications._load_definitions()
for app in Applications._apps:
if app.name == app_name:
return app if "rename" not in app else Applications.find(app.rename)
# Return the default application
return Application({
"name": app_name,
"type": Applications.TYPES["UNDEF"],
"helper": None,
"note": None,
"ignore": False,
})
@staticmethod
def all():
if not Applications._apps:
Applications._load_definitions()
return Applications._apps
@staticmethod
def _load_definitions():
Applications._apps = ApplicationsCollection()
for file in Applications.DEFINITIONS:
try: Applications._load(file)
except PathNotFound as ex:
if not os.path.dirname(file) in USER_CONFIG_DIRS:
raise ex
@classmethod
def _load(cls, file):
try:
with open(file, "r") as f:
xmldoc = minidom.parseString(f.read())
except IOError:
raise PathNotFound('DATA_DIR')
except ExpatError as ex:
msg = "Unable to parse {0}\nHint: {1}".format(file, ex)
raise TracerError(msg)
for applications in xmldoc.getElementsByTagName("applications"):
cls._remove_unwanted_children(applications)
for child in applications.childNodes:
if child.nodeName == "app":
attrs = dict(child.attributes.items())
Applications._append_application(attrs)
if child.nodeName == "group":
cls._remove_unwanted_children(child)
for app in child.childNodes:
app_attrs = dict(app.attributes.items())
group_attrs = dict(child.attributes.items())
Applications._append_application(app_attrs, group_attrs)
@classmethod
def _remove_unwanted_children(cls, node):
for child in node.childNodes:
if child.nodeType != node.ELEMENT_NODE:
node.removeChild(child)
@staticmethod
def _append_application(default_attrs, specific_attrs={}):
application = Application(default_attrs)
application.update(specific_attrs)
if application in Applications._apps:
i = Applications._apps.index(application)
Applications._apps[i].update(application)
else:
application.setdefault('type', Applications.DEFAULT_TYPE)
application.setdefault('helper', Applications._helper(application))
application.setdefault('note', None)
application.setdefault('ignore', False)
Applications._apps.append(application)
@staticmethod
def _helper(app):
if app.type == Applications.TYPES["DAEMON"]:
if System.init_system() == "systemd":
return "systemctl restart {0}".format(app.name)
else:
return "service {0} restart".format(app.name)
elif app.type == Applications.TYPES["STATIC"]:
return _("You will have to reboot your computer")
elif app.type == Applications.TYPES["SESSION"]:
return _("You will have to log out & log in again")
return None
class Application:
"""
Represent the application defined in ``applications.xml``
:param str name: The name of the application
:param str type: See ``Applications.TYPES`` for possible values
:param str helper: Describes how to restart the applications
:param bool note: Provides additional informations to the ``helper``
:param bool ignore: If ``True``, the application won't be printed
:param Processes processes_factory: Class providing list of running processes
"""
processes_factory = Processes
_attributes = None
def __init__(self, attributes_dict):
self._attributes = attributes_dict
self._cached_name = None
def __eq__(self, other):
return isinstance(other, Application) and self.name == other.name
def __ne__(self, other):
return not self.__eq__(other)
def __hash__(self):
return hash(self.name)
def __getattr__(self, item):
return self._attributes[item]
def __len__(self):
return len(self._attributes)
def __contains__(self, item):
return item in self._attributes
def __str__(self):
return "<" + self.__class__.__name__ + ": " + self._attributes["name"] + ">"
def __repr__(self):
return self.__str__()
def setdefault(self, key, value):
self._attributes.setdefault(key, value)
def update(self, values):
if isinstance(values, Application):
values = values._attributes
self._attributes.update(values)
@property
def is_interpreted(self):
# @TODO check all instances
return self.instances and self.instances[0].is_interpreted
@property
@lru_cache(maxsize=None)
def is_session(self):
if self.name.startswith("ssh-") and self.name.endswith("-session"):
return True
return self.instances and self.instances[0].is_session
@property
def type(self):
if self._attributes["type"] != Applications.TYPES["UNDEF"]:
return self._attributes["type"]
if self.is_session:
return Applications.TYPES["SESSION"]
if self.is_service:
return Applications.TYPES["DAEMON"]
return Applications.DEFAULT_TYPE
@property
@lru_cache(maxsize=None)
def is_service(self):
if System.init_system() == "systemd":
return SystemdDbus().unit_path_from_id("{0}.service".format(self.name))
# @TODO rename to helper_format
@property
def helper(self):
helper = self._attributes["helper"] or Applications._helper(self)
if System.user() != "root" and self.type == Applications.TYPES["DAEMON"]:
if helper and not helper.startswith("sudo "):
helper = "sudo " + helper
return helper
@property
def helper_contains_formating(self):
if not self.helper:
return None
return bool(re.search(r"\{.*\}", self.helper))
@property
def helper_contains_name(self):
if not self.helper:
return None
return bool(re.search(r"\{NAME\}", self.helper))
@property
def helpers(self):
"""
Return the list of helpers which describes how to restart the application.
When no ``helper_format`` was described, empty list will be returned.
If ``helper_format`` contains process specific arguments such a ``{PID}``, etc.
list will contain helper for every application instance.
In other cases, there will be just one helper in the list.
"""
helpers = []
if self.helper:
if not self.helper_contains_formating:
helpers.append(self.helper)
else:
for process in self.affected_instances:
helpers.append(self.helper.format(
NAME=self.name,
PNAME=process.name,
PID=process.pid,
EXE=process.exe,
))
return helpers
@property
def instances(self):
"""
Return collection of processes with same name as application.
I.e. running instances of the application
"""
return self.processes_factory.all().filtered(
lambda process: self._attributes["name"] in [process.name(), process.real_name])
affected_instances = None
class AffectedApplication(Application):
@property
def name(self):
# We need to cache manually instead of using `@lru_cache` because this
# property is used for self.__hash__
if not self._cached_name:
self._cached_name = self._name()
return self._cached_name
def _name(self):
if System.init_system() == "systemd":
bus = SystemdDbus()
# Trying to access `self.instances` just once
try:
pid = self.instances[0].pid
except IndexError:
pid = None
if pid:
if self.instances and bus.unit_path_from_pid(pid):
if not bus.has_service_property_from_pid(pid, 'PAMName'):
Id = bus.get_unit_property_from_pid(pid, 'Id')
if Id and re.search(r"\.service$", Id):
return re.sub(r'\.service$', '', Id)
if self.is_interpreted:
return self.instances[0].real_name
return self._attributes["name"]
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