# Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

#

#    Licensed under the Apache License, Version 2.0 (the "License"); you may

#    not use this file except in compliance with the License. You may obtain

#    a copy of the License at

#

#         http://www.apache.org/licenses/LICENSE-2.0

#

#    Unless required by applicable law or agreed to in writing, software

#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT

#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the

#    License for the specific language governing permissions and limitations

#    under the License.

from ConfigParser import NoOptionError

from datetime import datetime

import errno

import glob

import os

import shutil

from subprocess import check_call, Popen, PIPE

import sys

import time

import traceback

import iniparse

import smf_include

import sqlalchemy

NEUTRON_CONF_MAPPINGS = {

    # Deprecated group/name

    ('DEFAULT', 'rabbit_durable_queues'): ('DEFAULT', 'amqp_durable_queues'),

    ('rpc_notifier2', 'topics'): ('DEFAULT', 'notification_topics'),

    ('DEFAULT', 'matchmaker_ringfile'): ('matchmaker_ring', 'ringfile'),

    # As of Juno, EVS now uses the standard quota driver

    ('quotas', 'quota_driver'): (None, None)

}

DHCP_AGENT_MAPPINGS = {

    # Deprecated group/name

    ('DEFAULT', 'dnsmasq_dns_server'): ('DEFAULT', 'dnsmasq_dns_servers'),

}

EVS_PLUGIN_MAPPINGS = {

    # No longer referenced by the service

    ('DATABASE', 'sql_connection'): (None, None),

}

def update_mapping(section, key, mapping):

    """ look for deprecated variables and, if found, convert it to the new

    section/key.

    """

    if (section, key) in mapping:

        print "Deprecated value found: [%s] %s" % (section, key)

        section, key = mapping[(section, key)]

        if section is None and key is None:

            print "Removing from configuration"

        else:

            print "Updating to: [%s] %s" % (section, key)

    return section, key

def alter_mysql_tables(engine):

    """ Convert MySQL tables to use utf8

    """

    import MySQLdb

    for _none in range(5):

        try:

            db = MySQLdb.connect(host=engine.url.host,

                                 user=engine.url.username,

                                 passwd=engine.url.password,

                                 db=engine.url.database)

            break

        except MySQLdb.OperationalError as err:

            # mysql is not ready. sleep for 2 more seconds

            time.sleep(2)

    else:

        print "Unable to connect to MySQL:  %s" % err

        print ("Please verify MySQL is properly configured and online "

               "before using svcadm(1M) to clear this service.")

        sys.exit(smf_include.SMF_EXIT_ERR_FATAL)

    cursor = db.cursor()

    cursor.execute("ALTER DATABASE %s CHARACTER SET = 'utf8'" %

                   engine.url.database)

    cursor.execute("ALTER DATABASE %s COLLATE = 'utf8_general_ci'" %

                   engine.url.database)

    cursor.execute("SHOW tables")

    res = cursor.fetchall()

    if res:

        cursor.execute("SET foreign_key_checks = 0")

        for item in res:

            cursor.execute("ALTER TABLE %s.%s CONVERT TO "

                           "CHARACTER SET 'utf8', COLLATE 'utf8_general_ci'"

                           % (engine.url.database, item[0]))

        cursor.execute("SET foreign_key_checks = 1")

        db.commit()

        db.close()

def modify_conf(old_file, mapping=None):

    """ Copy over all uncommented options from the old configuration file.  In

    addition, look for deprecated section/keys and convert them to the new

    section/key.

    """

    new_file = old_file + '.new'

    # open the previous version

    old = iniparse.ConfigParser()

    old.readfp(open(old_file))

    # open the new version

    new = iniparse.ConfigParser()

    try:

        new.readfp(open(new_file))

    except IOError as err:

        if err.errno == errno.ENOENT:

            # The upgrade did not deliver a .new file so, return

            print "%s not found - continuing with %s" % (new_file, old_file)

            return

        else:

            raise

    print "\nupdating %s" % old_file

    # walk every single section for uncommented options

    default_items = set(old.items('DEFAULT'))

    for section in old.sections() + ['DEFAULT']:

        # DEFAULT items show up in every section so remove them

        if section != 'DEFAULT':

            section_items = set(old.items(section)) - default_items

        else:

            section_items = default_items

        for key, value in section_items:

            # keep a copy of the old value

            oldvalue = value

            if mapping is not None:

                section, key = update_mapping(section, key, mapping)

                if section is None and key is None:

                    # option is deprecated so continue

                    continue

            if not new.has_section(section):

                if section != 'DEFAULT':

                    new.add_section(section)

            # print to the log when a value for the same section.key is

            # changing to a new value

            try:

                new_value = new.get(section, key)

                if new_value != value and '%SERVICE' not in new_value:

                    print "Changing [%s] %s:\n- %s\n+ %s" % \

                        (section, key, oldvalue, new_value)

                    print

            except NoOptionError:

                # the new configuration file does not have this option set so

                # just continue

                pass

            # Only copy the old value to the new conf file if the entry doesn't

            # exist or if it contains '%SERVICE'

            if not new.has_option(section, key) or \

               '%SERVICE' in new.get(section, key):

                new.set(section, key, value)

    # copy the old conf file to a backup

    today = datetime.now().strftime("%Y%m%d%H%M%S")

    shutil.copy2(old_file, old_file + '.' + today)

    # copy the new conf file in place

    with open(old_file, 'wb+') as fh:

        new.write(fh)

def start():

    # pull out the current version of config/upgrade-id

    p = Popen(['/usr/bin/svcprop', '-p', 'config/upgrade-id',

               os.environ['SMF_FMRI']], stdout=PIPE, stderr=PIPE)

    curr_ver, _err = p.communicate()

    curr_ver = curr_ver.strip()

    # extract the openstack-upgrade-id from the pkg

    p = Popen(['/usr/bin/pkg', 'contents', '-H', '-t', 'set', '-o', 'value',

               '-a', 'name=openstack.upgrade-id',

               'pkg:/cloud/openstack/neutron'], stdout=PIPE, stderr=PIPE)

    pkg_ver, _err = p.communicate()

    pkg_ver = pkg_ver.strip()

    if curr_ver == pkg_ver:

        # No need to upgrade

        sys.exit(smf_include.SMF_EXIT_OK)

    # look for any .new files

    if glob.glob('/etc/neutron/*.new'):

        # the versions are different, so perform an upgrade

        # modify the configuration files

        modify_conf('/etc/neutron/api-paste.ini')

        modify_conf('/etc/neutron/dhcp_agent.ini', DHCP_AGENT_MAPPINGS)

        modify_conf('/etc/neutron/l3_agent.ini')

        modify_conf('/etc/neutron/neutron.conf', NEUTRON_CONF_MAPPINGS)

        modify_conf('/etc/neutron/plugins/evs/evs_plugin.ini',

                    EVS_PLUGIN_MAPPINGS)

    config = iniparse.RawConfigParser()

    config.read('/etc/neutron/neutron.conf')

    # In certain cases the database section does not exist and the

    # default database chosen is sqlite.

    if config.has_section('database'):

        db_connection = config.get('database', 'connection')

        engine = sqlalchemy.create_engine(db_connection)

        # migrate EVS to Neutron db

        if engine.url.username != '%SERVICE_USER%':

            check_call(['/usr/lib/neutron/evs-neutron-migration'])

            print "EVS to Neutron migration complete"

            if engine.url.drivername == 'mysql':

                alter_mysql_tables(engine)

                print "altered character set to utf8 in neutron tables"

            check_call(['/usr/bin/neutron-db-manage', '--config-file',

                        '/etc/neutron/neutron.conf', '--config-file',

                        '/etc/neutron/plugins/evs/evs_plugin.ini', 'stamp',

                        'juno'])

    # update the current version

    check_call(['/usr/sbin/svccfg', '-s', os.environ['SMF_FMRI'], 'setprop',

               'config/upgrade-id', '=', pkg_ver])

    check_call(['/usr/sbin/svccfg', '-s', os.environ['SMF_FMRI'], 'refresh'])

    sys.exit(smf_include.SMF_EXIT_OK)

if __name__ == '__main__':

    os.putenv('LC_ALL', 'C')

    try:

        smf_include.smf_main()

    except Exception as err:

        print 'Unknown error:  %s' % err

        print

        traceback.print_exc(file=sys.stdout)

        sys.exit(smf_include.SMF_EXIT_ERR_FATAL)