115 lines
4.4 KiB
Python
115 lines
4.4 KiB
Python
# -*- coding: utf-8 -*-
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#
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# Copyright (C) 2007, 2008 by Jan Dittberner.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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# USA.
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#
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# Version: $Id$
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"""This module defines the BackendEntity base class."""
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import os
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import logging
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import tempfile
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from gnuviechadmin.exceptions import MissingFieldsError
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from gnuviechadmin.backend.settings import config
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from gnuviechadmin.util import gpgmail
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from subprocess import Popen, PIPE
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from sqlalchemy.orm import object_mapper
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class BackendEntity(object):
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"""This is the abstract base class for all backend entity classes."""
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def __init__(self, delegateto, verbose = False):
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self.logger = logging.getLogger("%s.%s" % (
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self.__class__.__module__, self.__class__.__name__))
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self.delegateto = delegateto
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self.verbose = verbose
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def __repr__(self):
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return self.delegateto.__repr__(verbose = self.verbose)
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def sucommand(self, cmdline, pipedata = None):
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"""Executes a command as root using the configured suwrapper
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command. If a pipe is specified it is used as stdin of the
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subprocess."""
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self.logger.debug("sucommand called: %s (pipedata=%s)", cmdline,
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str(pipedata))
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suwrapper = config.get('common', 'suwrapper')
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toexec = "%s %s" % (suwrapper, cmdline)
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if pipedata:
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pipeproc = Popen(toexec, shell = True, stdin=PIPE)
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pipe = pipeproc.stdin
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print >> pipe, pipedata
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pipe.close()
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sts = os.waitpid(pipeproc.pid, 0)
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if self.verbose:
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print "%s|%s: %d" % (pipedata, toexec, sts[1])
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self.logger.info("%s|%s: %d", pipedata, toexec, sts[1])
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else:
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pipeproc = Popen(toexec, shell = True)
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sts = os.waitpid(pipeproc.pid, 0)
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if self.verbose:
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print "%s: %s" % (toexec, sts[1])
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self.logger.info("%s: %s", toexec, sts[1])
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return sts[1]
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def supipe(self, cmdlines):
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"""Executes multiple commands as root and pipes the output of
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the commands to the input of the next commands."""
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self.logger.debug("supipe called: %s", " | ".join(cmdlines))
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suwrapper = config.get('common', 'suwrapper')
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predecessor = None
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for cmdline in cmdlines:
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toexec = "%s %s" % (suwrapper, cmdline)
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if predecessor is None:
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pipeproc = Popen(toexec, shell = True, stdout = PIPE)
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else:
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pipeproc = Popen(toexec, shell = True,
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stdin = predecessor.stdout, stdout = PIPE)
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predecessor = pipeproc
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output = predecessor.communicate()[0]
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return predecessor.wait()
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def send_mail(self, subject, text):
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"""This method sends a mail with the given text and subject
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and signs it usign GnuPG. If a public key of the recipient is
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available the mail is encrypted."""
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gpgmail.send_mail(subject, text)
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def validate(self):
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"""Validates whether all mandatory fields of the entity have
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values."""
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missingfields = []
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for key in [col.name for col in \
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object_mapper(
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self.delegateto).local_table.columns \
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if not col.primary_key and not col.nullable]:
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if self.delegateto.__getattribute__(key) is None:
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missingfields.append(key)
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if missingfields:
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raise MissingFieldsError(missingfields)
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def write_to_file(self, filename, template):
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"""Write the data from template to the specified file."""
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tmp = tempfile.NamedTemporaryFile()
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tmp.write(template.encode('utf_8'))
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tmp.flush()
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cmd = 'cp "%s" "%s"' % (tmp.name, filename)
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self.sucommand(cmd)
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tmp.close()
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