__ __ __ __ _____ _ _ _____ _ _ _
| \/ | \ \ / / | __ \ (_) | | / ____| | | | |
| \ / |_ __\ V / | |__) | __ ___ ____ _| |_ ___ | (___ | |__ ___| | |
| |\/| | '__|> < | ___/ '__| \ \ / / _` | __/ _ \ \___ \| '_ \ / _ \ | |
| | | | |_ / . \ | | | | | |\ V / (_| | || __/ ____) | | | | __/ | |
|_| |_|_(_)_/ \_\ |_| |_| |_| \_/ \__,_|\__\___| |_____/|_| |_|\___V 2.1
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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Return list of applications which use some outdated files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)