migration.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Wed, 16 Jun 2010 09:21:49 +0200
changeset 5754 51179e0bb250
parent 5590 a56eb02f9ce7
child 5967 8deedfeb7846
permissions -rw-r--r--
[test] support for test on postgres database using the same mecanism as sqlite: one template database generated when necessary + actual test database created from the template * * * [test] reset postgres database between test of the same fixture
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# copyright 2003-2010 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
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#
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# This file is part of CubicWeb.
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#
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# CubicWeb is free software: you can redistribute it and/or modify it under the
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# terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation, either version 2.1 of the License, or (at your option)
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# any later version.
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#
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# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License along
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# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
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"""utilities for instances migration
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"""
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__docformat__ = "restructuredtext en"
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import sys
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import os
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import logging
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import tempfile
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from os.path import exists, join, basename, splitext
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from logilab.common.decorators import cached
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from logilab.common.configuration import REQUIRED, read_old_config
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from logilab.common.shellutils import ASK
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from logilab.common.changelog import Version
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from cubicweb import ConfigurationError
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0
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def filter_scripts(config, directory, fromversion, toversion, quiet=True):
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    """return a list of paths of migration files to consider to upgrade
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    from a version to a greater one
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    """
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    from logilab.common.changelog import Version # doesn't work with appengine
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    assert fromversion
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    assert toversion
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    assert isinstance(fromversion, tuple), fromversion.__class__
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    assert isinstance(toversion, tuple), toversion.__class__
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    assert fromversion <= toversion, (fromversion, toversion)
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    if not exists(directory):
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        if not quiet:
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            print directory, "doesn't exists, no migration path"
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        return []
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    if fromversion == toversion:
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        return []
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    result = []
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    for fname in os.listdir(directory):
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        if fname.endswith('.pyc') or fname.endswith('.pyo') \
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               or fname.endswith('~'):
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            continue
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        fpath = join(directory, fname)
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        try:
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            tver, mode = fname.split('_', 1)
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        except ValueError:
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            continue
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        mode = mode.split('.', 1)[0]
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        if not config.accept_mode(mode):
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            continue
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        try:
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            tver = Version(tver)
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        except ValueError:
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            continue
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        if tver <= fromversion:
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            continue
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        if tver > toversion:
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            continue
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        result.append((tver, fpath))
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    # be sure scripts are executed in order
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    return sorted(result)
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IGNORED_EXTENSIONS = ('.swp', '~')
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def execscript_confirm(scriptpath):
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    """asks for confirmation before executing a script and provides the
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    ability to show the script's content
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    """
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    while True:
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        answer = ASK.ask('Execute %r ?' % scriptpath,
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                         ('Y','n','show','abort'), 'Y')
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        if answer == 'abort':
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            raise SystemExit(1)
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        elif answer == 'n':
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            return False
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        elif answer == 'show':
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            stream = open(scriptpath)
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            scriptcontent = stream.read()
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            stream.close()
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            print
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            print scriptcontent
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            print
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        else:
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            return True
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def yes(*args, **kwargs):
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    return True
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class MigrationHelper(object):
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    """class holding CubicWeb Migration Actions used by migration scripts"""
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    def __init__(self, config, interactive=True, verbosity=1):
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        self.config = config
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        if config:
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            # no config on shell to a remote instance
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            self.config.init_log(logthreshold=logging.ERROR)
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        # 0: no confirmation, 1: only main commands confirmed, 2 ask for everything
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        self.verbosity = verbosity
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        self.need_wrap = True
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        if not interactive or not verbosity:
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            self.confirm = yes
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            self.execscript_confirm = yes
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        else:
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            self.execscript_confirm = execscript_confirm
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        self._option_changes = []
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        self.__context = {'confirm': self.confirm,
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                          'config': self.config,
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                          'interactive_mode': interactive,
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                          }
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    def __getattribute__(self, name):
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        try:
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            return object.__getattribute__(self, name)
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        except AttributeError:
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            cmd = 'cmd_%s' % name
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            if hasattr(self, cmd):
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                meth = getattr(self, cmd)
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                return lambda *args, **kwargs: self.interact(args, kwargs,
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                                                             meth=meth)
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            raise
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        raise AttributeError(name)
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0
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    def repo_connect(self):
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        return self.config.repository()
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0
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    def migrate(self, vcconf, toupgrade, options):
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        """upgrade the given set of cubes
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0
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        `cubes` is an ordered list of 3-uple:
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        (cube, fromversion, toversion)
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        """
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        if options.fs_only:
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            # monkey path configuration.accept_mode so database mode (e.g. Any)
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            # won't be accepted
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            orig_accept_mode = self.config.accept_mode
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            def accept_mode(mode):
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                if mode == 'Any':
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                    return False
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                return orig_accept_mode(mode)
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            self.config.accept_mode = accept_mode
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        # may be an iterator
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        toupgrade = tuple(toupgrade)
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        vmap = dict( (cube, (fromver, tover)) for cube, fromver, tover in toupgrade)
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        ctx = self.__context
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        ctx['versions_map'] = vmap
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        if self.config.accept_mode('Any') and 'cubicweb' in vmap:
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            migrdir = self.config.migration_scripts_dir()
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            self.cmd_process_script(join(migrdir, 'bootstrapmigration_repository.py'))
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        for cube, fromversion, toversion in toupgrade:
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            if cube == 'cubicweb':
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                migrdir = self.config.migration_scripts_dir()
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            else:
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                migrdir = self.config.cube_migration_scripts_dir(cube)
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            scripts = filter_scripts(self.config, migrdir, fromversion, toversion)
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            if scripts:
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                prevversion = None
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                for version, script in scripts:
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                    # take care to X.Y.Z_Any.py / X.Y.Z_common.py: we've to call
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                    # cube_upgraded once all script of X.Y.Z have been executed
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                    if prevversion is not None and version != prevversion:
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                        self.cube_upgraded(cube, prevversion)
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                    prevversion = version
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                    self.cmd_process_script(script)
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                self.cube_upgraded(cube, toversion)
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            else:
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                self.cube_upgraded(cube, toversion)
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    def cube_upgraded(self, cube, version):
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        pass
0
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    def shutdown(self):
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        pass
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0
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    def interact(self, args, kwargs, meth):
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        """execute the given method according to user's confirmation"""
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        msg = 'Execute command: %s(%s) ?' % (
0
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            meth.__name__[4:],
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            ', '.join([repr(arg) for arg in args] +
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                      ['%s=%r' % (n,v) for n,v in kwargs.items()]))
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        if 'ask_confirm' in kwargs:
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            ask_confirm = kwargs.pop('ask_confirm')
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        else:
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            ask_confirm = True
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        if not ask_confirm or self.confirm(msg):
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            return meth(*args, **kwargs)
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    def confirm(self, question, shell=True, abort=True, retry=False, default='y'):
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        """ask for confirmation and return true on positive answer
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        if `retry` is true the r[etry] answer may return 2
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        """
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        possibleanswers = ['y', 'n']
0
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        if abort:
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            possibleanswers.append('abort')
0
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        if shell:
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            possibleanswers.append('shell')
0
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        if retry:
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            possibleanswers.append('retry')
0
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        try:
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            answer = ASK.ask(question, possibleanswers, default)
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        except (EOFError, KeyboardInterrupt):
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            answer = 'abort'
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        if answer == 'n':
0
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            return False
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        if answer == 'retry':
0
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            return 2
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        if answer == 'abort':
0
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            raise SystemExit(1)
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        if shell and answer == 'shell':
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            self.interactive_shell()
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            return self.confirm(question)
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        return True
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    def interactive_shell(self):
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        self.confirm = yes
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        self.need_wrap = False
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        # avoid '_' to be added to builtins by sys.display_hook
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        def do_not_add___to_builtins(obj):
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            if obj is not None:
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                print repr(obj)
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        sys.displayhook = do_not_add___to_builtins
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        local_ctx = self._create_context()
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        try:
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            import readline
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            from rlcompleter import Completer
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        except ImportError:
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            # readline not available
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            pass
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        else:
0
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            readline.set_completer(Completer(local_ctx).complete)
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            readline.parse_and_bind('tab: complete')
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   250
            home_key = 'HOME'
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   251
            if sys.platform == 'win32':
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   252
                home_key = 'USERPROFILE'
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            histfile = os.path.join(os.environ[home_key], ".eshellhist")
0
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            try:
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                readline.read_history_file(histfile)
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   256
            except IOError:
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                pass
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        from code import interact
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   259
        banner = """entering the migration python shell
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just type migration commands or arbitrary python code and type ENTER to execute it
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   261
type "exit" or Ctrl-D to quit the shell and resume operation"""
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   262
        # give custom readfunc to avoid http://bugs.python.org/issue1288615
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   263
        def unicode_raw_input(prompt):
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   264
            return unicode(raw_input(prompt), sys.stdin.encoding)
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   265
        interact(banner, readfunc=unicode_raw_input, local=local_ctx)
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        readline.write_history_file(histfile)
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   267
        # delete instance's confirm attribute to avoid questions
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   268
        del self.confirm
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   269
        self.need_wrap = True
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    @cached
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    def _create_context(self):
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        """return a dictionary to use as migration script execution context"""
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        context = self.__context
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   275
        for attr in dir(self):
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            if attr.startswith('cmd_'):
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   277
                if self.need_wrap:
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                    context[attr[4:]] = getattr(self, attr[4:])
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                else:
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                    context[attr[4:]] = getattr(self, attr)
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        return context
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   282
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e3ccadb126d7 [shell] make process_script available throuhg c-c shell / migration script context
Sylvain Thénault <sylvain.thenault@logilab.fr>
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diff changeset
   283
    def cmd_process_script(self, migrscript, funcname=None, *args, **kwargs):
5430
ed8f71e244f8 [shell] #715938: support of script parameters (using standard '--' as arguments separator)
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   284
        """execute a migration script in interactive mode
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diff changeset
   285
ed8f71e244f8 [shell] #715938: support of script parameters (using standard '--' as arguments separator)
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diff changeset
   286
        Display the migration script path, ask for confirmation and execute it
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   287
        if confirmed
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diff changeset
   288
ed8f71e244f8 [shell] #715938: support of script parameters (using standard '--' as arguments separator)
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   289
        Context environment can have these variables defined:
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2455ca3a2a3a [c-c shell] make script arguments available as __args__ in the script namespace. Use scriptargs instead of args as process_script argument name.
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   290
        - __name__ : will be determine by funcname parameter
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   291
        - __file__ : is the name of the script if it exists
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diff changeset
   292
        - __args__ : script arguments coming from command-line
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diff changeset
   293
ed8f71e244f8 [shell] #715938: support of script parameters (using standard '--' as arguments separator)
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diff changeset
   294
        :param migrscript: name of the script
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diff changeset
   295
        :param funcname: defines __name__ inside the shell (or use __main__)
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diff changeset
   296
        :params args: optional arguments for funcname
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diff changeset
   297
        :keyword scriptargs: optional arguments of the script
0
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diff changeset
   298
        """
3812
d37d7105e15f [B] migration: normalize migration script path
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parents: 3715
diff changeset
   299
        migrscript = os.path.normpath(migrscript)
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2fbb79054a1a imported patch cwctl-shell-textfile
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diff changeset
   300
        if migrscript.endswith('.py'):
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diff changeset
   301
            script_mode = 'python'
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diff changeset
   302
        elif migrscript.endswith(('.txt', '.rst')):
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diff changeset
   303
            script_mode = 'doctest'
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diff changeset
   304
        else:
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diff changeset
   305
            raise Exception('This is not a valid cubicweb shell input')
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parents: 3812
diff changeset
   306
        if not self.execscript_confirm(migrscript):
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parents: 3812
diff changeset
   307
            return
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diff changeset
   308
        scriptlocals = self._create_context().copy()
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parents: 3812
diff changeset
   309
        if script_mode == 'python':
0
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diff changeset
   310
            if funcname is None:
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diff changeset
   311
                pyname = '__main__'
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diff changeset
   312
            else:
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diff changeset
   313
                pyname = splitext(basename(migrscript))[0]
5430
ed8f71e244f8 [shell] #715938: support of script parameters (using standard '--' as arguments separator)
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diff changeset
   314
            scriptlocals.update({'__file__': migrscript, '__name__': pyname,
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2455ca3a2a3a [c-c shell] make script arguments available as __args__ in the script namespace. Use scriptargs instead of args as process_script argument name.
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diff changeset
   315
                                 '__args__': kwargs.pop("scriptargs", [])})
0
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diff changeset
   316
            execfile(migrscript, scriptlocals)
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diff changeset
   317
            if funcname is not None:
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diff changeset
   318
                try:
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diff changeset
   319
                    func = scriptlocals[funcname]
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diff changeset
   320
                    self.info('found %s in locals', funcname)
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diff changeset
   321
                    assert callable(func), '%s (%s) is not callable' % (func, funcname)
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diff changeset
   322
                except KeyError:
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diff changeset
   323
                    self.critical('no %s in script %s', funcname, migrscript)
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diff changeset
   324
                    return None
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diff changeset
   325
                return func(*args, **kwargs)
3935
2fbb79054a1a imported patch cwctl-shell-textfile
Nicolas Chauvat <nicolas.chauvat@logilab.fr>
parents: 3812
diff changeset
   326
        else: # script_mode == 'doctest'
2fbb79054a1a imported patch cwctl-shell-textfile
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parents: 3812
diff changeset
   327
            import doctest
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diff changeset
   328
            doctest.testfile(migrscript, module_relative=False,
2fbb79054a1a imported patch cwctl-shell-textfile
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parents: 3812
diff changeset
   329
                             optionflags=doctest.ELLIPSIS, globs=scriptlocals)
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d628defebc17 delete-trailing-whitespace + some copyright update
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diff changeset
   330
0
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diff changeset
   331
    def cmd_option_renamed(self, oldname, newname):
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diff changeset
   332
        """a configuration option has been renamed"""
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diff changeset
   333
        self._option_changes.append(('renamed', oldname, newname))
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parents:
diff changeset
   334
5580
3e9e6dd54ebb [migration] add migration file commands to follow option group changes
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5488
diff changeset
   335
    def cmd_option_group_changed(self, option, oldgroup, newgroup):
0
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diff changeset
   336
        """a configuration option has been moved in another group"""
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diff changeset
   337
        self._option_changes.append(('moved', option, oldgroup, newgroup))
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parents:
diff changeset
   338
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diff changeset
   339
    def cmd_option_added(self, optname):
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diff changeset
   340
        """a configuration option has been added"""
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diff changeset
   341
        self._option_changes.append(('added', optname))
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parents:
diff changeset
   342
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diff changeset
   343
    def cmd_option_removed(self, optname):
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diff changeset
   344
        """a configuration option has been removed"""
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diff changeset
   345
        # can safely be ignored
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diff changeset
   346
        #self._option_changes.append(('removed', optname))
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parents:
diff changeset
   347
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diff changeset
   348
    def cmd_option_type_changed(self, optname, oldtype, newvalue):
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diff changeset
   349
        """a configuration option's type has changed"""
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diff changeset
   350
        self._option_changes.append(('typechanged', optname, oldtype, newvalue))
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diff changeset
   351
676
270eb87a768a provide a new add_cubes() migration function for cases where the new cubes are linked together by new relations
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diff changeset
   352
    def cmd_add_cubes(self, cubes):
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diff changeset
   353
        """modify the list of used cubes in the in-memory config
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diff changeset
   354
        returns newly inserted cubes, including dependencies
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diff changeset
   355
        """
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parents: 447
diff changeset
   356
        if isinstance(cubes, basestring):
270eb87a768a provide a new add_cubes() migration function for cases where the new cubes are linked together by new relations
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diff changeset
   357
            cubes = (cubes,)
0
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diff changeset
   358
        origcubes = self.config.cubes()
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diff changeset
   359
        newcubes = [p for p in self.config.expand_cubes(cubes)
0
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parents:
diff changeset
   360
                       if not p in origcubes]
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diff changeset
   361
        if newcubes:
676
270eb87a768a provide a new add_cubes() migration function for cases where the new cubes are linked together by new relations
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diff changeset
   362
            for cube in cubes:
270eb87a768a provide a new add_cubes() migration function for cases where the new cubes are linked together by new relations
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parents: 447
diff changeset
   363
                assert cube in newcubes
0
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parents:
diff changeset
   364
            self.config.add_cubes(newcubes)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   365
        return newcubes
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   366
2124
5a0b02f37b23 set removedeps to False by default, raise an exception instead of a simple assertion for error, more remove_cube tests
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2122
diff changeset
   367
    def cmd_remove_cube(self, cube, removedeps=False):
2122
4ea13a828513 add removedeps option to remove_cube to control wether a cube's dependencies should be removed as well or not
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 1977
diff changeset
   368
        if removedeps:
4ea13a828513 add removedeps option to remove_cube to control wether a cube's dependencies should be removed as well or not
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 1977
diff changeset
   369
            toremove = self.config.expand_cubes([cube])
4ea13a828513 add removedeps option to remove_cube to control wether a cube's dependencies should be removed as well or not
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 1977
diff changeset
   370
        else:
4ea13a828513 add removedeps option to remove_cube to control wether a cube's dependencies should be removed as well or not
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 1977
diff changeset
   371
            toremove = (cube,)
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   372
        origcubes = self.config._cubes
2122
4ea13a828513 add removedeps option to remove_cube to control wether a cube's dependencies should be removed as well or not
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 1977
diff changeset
   373
        basecubes = [c for c in origcubes if not c in toremove]
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   374
        self.config._cubes = tuple(self.config.expand_cubes(basecubes))
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   375
        removed = [p for p in origcubes if not p in self.config._cubes]
2124
5a0b02f37b23 set removedeps to False by default, raise an exception instead of a simple assertion for error, more remove_cube tests
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2122
diff changeset
   376
        if not cube in removed:
5a0b02f37b23 set removedeps to False by default, raise an exception instead of a simple assertion for error, more remove_cube tests
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2122
diff changeset
   377
            raise ConfigurationError("can't remove cube %s, "
5a0b02f37b23 set removedeps to False by default, raise an exception instead of a simple assertion for error, more remove_cube tests
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2122
diff changeset
   378
                                     "used as a dependency" % cube)
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   379
        return removed
1802
d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 676
diff changeset
   380
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   381
    def rewrite_configuration(self):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   382
        # import locally, show_diffs unavailable in gae environment
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   383
        from cubicweb.toolsutils import show_diffs
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   384
        configfile = self.config.main_config_file()
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   385
        if self._option_changes:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   386
            read_old_config(self.config, self._option_changes, configfile)
3152
7ef7c82daf59 close file handler leak
Aurelien Campeas
parents: 2897
diff changeset
   387
        fd, newconfig = tempfile.mkstemp()
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   388
        for optdescr in self._option_changes:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   389
            if optdescr[0] == 'added':
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   390
                optdict = self.config.get_option_def(optdescr[1])
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   391
                if optdict.get('default') is REQUIRED:
447
0e52d72104a6 pylint fixes
sylvain.thenault@logilab.fr
parents: 0
diff changeset
   392
                    self.config.input_option(optdescr[1], optdict)
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   393
        self.config.generate_config(open(newconfig, 'w'))
5487
3ab2682a4b37 [migration] ask_confirm argument of show_diff doesn't contain an _
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5484
diff changeset
   394
        show_diffs(configfile, newconfig, askconfirm=self.confirm is not yes)
3152
7ef7c82daf59 close file handler leak
Aurelien Campeas
parents: 2897
diff changeset
   395
        os.close(fd)
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   396
        if exists(newconfig):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   397
            os.unlink(newconfig)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   398
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   399
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   400
from logging import getLogger
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   401
from cubicweb import set_log_methods
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   402
set_log_methods(MigrationHelper, getLogger('cubicweb.migration'))
5027
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   403
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   404
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   405
def version_strictly_lower(a, b):
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   406
    if a:
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   407
        a = Version(a)
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   408
    if b:
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   409
        b = Version(b)
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   410
    return a < b
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   411
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   412
def max_version(a, b):
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   413
    return str(max(Version(a), Version(b)))
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   414
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   415
class ConfigurationProblem(object):
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   416
    """Each cube has its own list of dependencies on other cubes/versions.
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   417
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   418
    The ConfigurationProblem is used to record the loaded cubes, then to detect
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   419
    inconsistencies in their dependencies.
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   420
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   421
    See configuration management on wikipedia for litterature.
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   422
    """
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   423
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   424
    def __init__(self, config):
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   425
        self.cubes = {}
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   426
        self.config = config
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   427
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   428
    def add_cube(self, name, version):
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   429
        self.cubes[name] = version
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   430
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   431
    def solve(self):
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   432
        self.warnings = []
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   433
        self.errors = []
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   434
        self.read_constraints()
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   435
        for cube, versions in sorted(self.constraints.items()):
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   436
            oper, version = None, None
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   437
            # simplify constraints
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   438
            if versions:
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   439
                for constraint in versions:
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   440
                    op, ver = constraint
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   441
                    if oper is None:
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   442
                        oper = op
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   443
                        version = ver
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   444
                    elif op == '>=' and oper == '>=':
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   445
                        version = max_version(ver, version)
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   446
                    else:
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   447
                        print 'unable to handle this case', oper, version, op, ver
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   448
            # "solve" constraint satisfaction problem
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   449
            if cube not in self.cubes:
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   450
                self.errors.append( ('add', cube, version) )
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   451
            elif versions:
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   452
                lower_strict = version_strictly_lower(self.cubes[cube], version)
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   453
                if oper in ('>=','='):
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   454
                    if lower_strict:
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   455
                        self.errors.append( ('update', cube, version) )
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   456
                else:
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   457
                    print 'unknown operator', oper
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   458
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   459
    def read_constraints(self):
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   460
        self.constraints = {}
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   461
        self.reverse_constraints = {}
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   462
        for cube in self.cubes:
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   463
            use = self.config.cube_dependencies(cube)
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   464
            for name, constraint in use.iteritems():
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   465
                self.constraints.setdefault(name,set())
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   466
                if constraint:
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   467
                    try:
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   468
                        oper, version = constraint.split()
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   469
                        self.constraints[name].add( (oper, version) )
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   470
                    except:
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   471
                        self.warnings.append(
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   472
                            'cube %s depends on %s but constraint badly '
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   473
                            'formatted: %s' % (cube, name, constraint))
d688daf0a62c [config] move ConfigurationProblem to migration + refactor it to benefit from config methods
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   474
                self.reverse_constraints.setdefault(name, set()).add(cube)