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#-*- coding: utf-8 -*- # query.py # Module providing querying operations to Tracer API # # 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 tracer.resources.tracer import Tracer from tracer.resources.system import System from tracer.resources.rules import Rules from tracer.resources.applications import Applications from tracer.resources.memory import dump_memory class Query(object): """ Provide API for Tracer querying operations. They are executed kind of lazily, so running the operation will return just an wrapper class with ``get()`` method. Example:: from tracer.query import Query q = Query() q.affected_applications().get() .. note:: Some querying methods can require root permissions """ def __init__(self, tracer=Tracer): self._tracer = tracer(System.package_manager(), Rules, Applications, dump_memory) def from_packages(self, packages): """List of ``Package`` that only should be traced""" self._tracer.specified_packages = packages return self def now(self): """ Pretend that specified packages have been updated just now. Benefit of this is absolutely no need for openning the package history database """ self._tracer.now = True return self def affected_applications(self, user=None): """ Return list of applications which use some outdated files """ return Lazy(self._tracer.trace_affected, {"user": user}) class Lazy(object): def __init__(self, method, kwargs): self._method = method self._kwargs = kwargs def get(self): return self._method(**self._kwargs)