# service.py - service entry lookup routines

#

# Copyright (C) 2011, 2012, 2013 Arthur de Jong

#

# This library is free software; you can redistribute it and/or

# modify it under the terms of the GNU Lesser General Public

# License as published by the Free Software Foundation; either

# version 2.1 of the License, or (at your option) any later version.

#

# This library is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

# Lesser General Public License for more details.

#

# You should have received a copy of the GNU Lesser General Public

# License along with this library; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

# 02110-1301 USA

import datetime

import cache

import common

import constants

import search

attmap = common.Attributes(cn='cn',

                           ipServicePort='ipServicePort',

                           ipServiceProtocol='ipServiceProtocol')

filter = '(objectClass=ipService)'

class Search(search.LDAPSearch):

    case_sensitive = ('cn', 'ipServiceProtocol')

    limit_attributes = ('ipServiceProtocol', )

    canonical_first = ('cn', )

    required = ('cn', 'ipServicePort', 'ipServiceProtocol')

class Cache(cache.Cache):

    tables = ('service_cache', 'service_alias_cache')

    create_sql = '''

        CREATE TABLE IF NOT EXISTS `service_cache`

          ( `cn` TEXT NOT NULL,

            `ipServicePort` INTEGER NOT NULL,

            `ipServiceProtocol` TEXT NOT NULL,

            `mtime` TIMESTAMP NOT NULL,

            UNIQUE (`ipServicePort`, `ipServiceProtocol`) );

        CREATE TABLE IF NOT EXISTS `service_alias_cache`

          ( `ipServicePort` INTEGER NOT NULL,

            `ipServiceProtocol` TEXT NOT NULL,

            `cn` TEXT NOT NULL,

            FOREIGN KEY(`ipServicePort`) REFERENCES `service_cache`(`ipServicePort`)

            ON DELETE CASCADE ON UPDATE CASCADE,

            FOREIGN KEY(`ipServiceProtocol`) REFERENCES `service_cache`(`ipServiceProtocol`)

            ON DELETE CASCADE ON UPDATE CASCADE );

        CREATE INDEX IF NOT EXISTS `service_alias_idx1` ON `service_alias_cache`(`ipServicePort`);

        CREATE INDEX IF NOT EXISTS `service_alias_idx2` ON `service_alias_cache`(`ipServiceProtocol`);

    '''

    retrieve_sql = '''

        SELECT `service_cache`.`cn` AS `cn`,

               `service_alias_cache`.`cn` AS `alias`,

               `service_cache`.`ipServicePort`,

               `service_cache`.`ipServiceProtocol`,

               `mtime`

        FROM `service_cache`

        LEFT JOIN `service_alias_cache`

          ON `service_alias_cache`.`ipServicePort` = `service_cache`.`ipServicePort`

         AND `service_alias_cache`.`ipServiceProtocol` = `service_cache`.`ipServiceProtocol`

    '''

    retrieve_by = dict(

        cn='''

            ( `service_cache`.`cn` = ? OR

              0 < (

                  SELECT COUNT(*)

                  FROM `service_alias_cache` `by_alias`

                  WHERE `by_alias`.`cn` = ?

                    AND `by_alias`.`ipServicePort` = `service_cache`.`ipServicePort`

                    AND `by_alias`.`ipServiceProtocol` = `service_cache`.`ipServiceProtocol`

                ))

        ''',

    )

    group_by = (0, 2, 3)  # cn, ipServicePort, ipServiceProtocol

    group_columns = (1, )  # alias

    def store(self, name, aliases, port, protocol):

        self.con.execute('''

            INSERT OR REPLACE INTO `service_cache`

            VALUES

              (?, ?, ?, ?)

        ''', (name, port, protocol, datetime.datetime.now()))

        self.con.execute('''

            DELETE FROM `service_alias_cache`

            WHERE `ipServicePort` = ?

              AND `ipServiceProtocol` = ?

        ''', (port, protocol))

        self.con.executemany('''

            INSERT INTO `service_alias_cache`

            VALUES

              (?, ?, ?)

        ''', ((port, protocol, alias) for alias in aliases))

class ServiceRequest(common.Request):

    def write(self, name, aliases, port, protocol):

        self.fp.write_string(name)

        self.fp.write_stringlist(aliases)

        self.fp.write_int32(port)

        self.fp.write_string(protocol)

    def convert(self, dn, attributes, parameters):

        names = attributes['cn']

        port = int(attributes['ipServicePort'][0])

        protocols = attributes['ipServiceProtocol']

        for protocol in protocols:

            yield (names[0], names[1:], port, protocol)

class ServiceByNameRequest(ServiceRequest):

    action = constants.NSLCD_ACTION_SERVICE_BYNAME

    def read_parameters(self, fp):

        name = fp.read_string()

        protocol = fp.read_string()

        if protocol:

            return dict(cn=name, ipServiceProtocol=protocol)

        else:

            return dict(cn=name)

class ServiceByNumberRequest(ServiceRequest):

    action = constants.NSLCD_ACTION_SERVICE_BYNUMBER

    def read_parameters(self, fp):

        number = fp.read_int32()

        protocol = fp.read_string()

        if protocol:

            return dict(ipServicePort=number, ipServiceProtocol=protocol)

        else:

            return dict(ipServicePort=number)

class ServiceAllRequest(ServiceRequest):

    action = constants.NSLCD_ACTION_SERVICE_ALL