trytond-ir_sequence_period/ir.py

# The COPYRIGHT file at the top level of this repository contains the full
# copyright notices and license terms.

from trytond.model import ModelSQL, ModelView, MatchMixin, fields
from trytond.pool import PoolMeta, Pool
from trytond.pyson import Eval, And, Bool
from trytond.transaction import Transaction
from trytond import backend
from sql import Literal, For

__all__ = ['Sequence', 'SequencePeriod', 'SequenceStrict']

sql_sequence = backend.get('Database').has_sequence()


class Sequence(metaclass=PoolMeta):
    __name__ = 'ir.sequence'

    periods = fields.One2Many('ir.sequence.period', 'sequence', 'Periods',
        states={'invisible': Eval('type') != 'incremental'},
        depends=['type'],
        order=[('start_date', 'ASC')])

    @classmethod
    def __setup__(cls):
        super(Sequence, cls).__setup__()
        cls._error_messages.update({
            'missing_date':
                'Must define a Date value in context for Sequence "%s".',
            'missing_period':
                'Cannot find a valid period for date "%s" in Sequence "%s".'
        })

    @classmethod
    def write(cls, sequences, values, *args):
        super(Sequence, cls).write(sequences, values, *args)
        if sql_sequence and not cls._strict:
            for sequence in sequences:
                for period in sequence.periods:
                    period.update_sql_sequence()

    @classmethod
    def get_id(cls, domain, _lock=False):
        if isinstance(domain, cls):
            domain = domain.id
        if isinstance(domain, int):
            domain = [('id', '=', domain)]

        with Transaction().set_context(user=False, _check_access=False):
            with Transaction().set_user(0):
                try:
                    sequence, = cls.search(domain, limit=1)
                except TypeError:
                    cls.raise_user_error('missing')
                date = Transaction().context.get('date')
                if sequence.periods:
                    if not date:
                        cls.raise_user_error('missing_date', sequence.rec_name)
                    pattern = {}
                    for period in sequence.periods:
                        if period.match(pattern):
                            return period.get_id(_lock=_lock)
                    cls.raise_user_error('missing_period', (date,
                        sequence.rec_name))
                return super(Sequence, cls).get_id(domain, _lock=_lock)
        return ''


class SequencePeriod(ModelSQL, ModelView, MatchMixin):
    '''Sequence period'''
    __name__ = 'ir.sequence.period'

    _strict = False
    sequence = fields.Many2One('ir.sequence', 'Sequence', required=True,
        ondelete='CASCADE')
    start_date = fields.Date('Start date', required=True)
    end_date = fields.Date('End date', required=True)
    number_next_internal = fields.Integer('Next Number',
        states={
            'invisible': ~Eval('_parent_sequence', {}).get('type').in_([
                'incremental']),
            'required': And(Eval('_parent_sequence', {}).get('type').in_(
                ['incremental']), not sql_sequence),
            })
    number_next = fields.Function(number_next_internal, 'get_number_next',
        'set_number_next')

    @staticmethod
    def default_number_next():
        return 1

    def get_number_next(self, name):
        if self.sequence.type != 'incremental':
            return

        transaction = Transaction()
        if sql_sequence and not self._strict:
            return transaction.database.sequence_next_number(
                transaction.connection, self._sql_sequence_name)
        else:
            return self.number_next_internal

    @classmethod
    def set_number_next(cls, periods, name, value):
        super(SequencePeriod, cls).write(periods, {
                'number_next_internal': value,
                })

    @property
    def _sql_sequence_name(self):
        'Return SQL sequence name'
        return '%s_%s' % (self._table, self.id)

    @classmethod
    def create(cls, vlist):
        periods = super(SequencePeriod, cls).create(vlist)
        for period, values in zip(periods, vlist):
            if sql_sequence and not cls._strict:
                period.update_sql_sequence(values.get('number_next',
                        cls.default_number_next()))
        return periods

    @classmethod
    def write(cls, periods, values, *args):
        super(SequencePeriod, cls).write(periods, values, *args)
        if sql_sequence and not cls._strict:
            actions = iter((periods, values) + args)
            for periods, values in zip(actions, actions):
                for period in periods:
                    period.update_sql_sequence(values.get('number_next'))

    @classmethod
    def delete(cls, periods):
        if sql_sequence and not cls._strict:
            for period in periods:
                period.delete_sql_sequence()
        return super(SequencePeriod, cls).delete(periods)

    def create_sql_sequence(self, number_next=None):
        'Create the SQL sequence'
        transaction = Transaction()

        if self.sequence.type != 'incremental':
            return
        if number_next is None:
            number_next = self.number_next
        if sql_sequence:
            transaction.database.sequence_create(transaction.connection,
                self._sql_sequence_name, self.sequence.number_increment,
                number_next)

    def update_sql_sequence(self, number_next=None):
        'Update the SQL sequence'
        transaction = Transaction()

        exist = transaction.database.sequence_exist(
            transaction.connection, self._sql_sequence_name)
        if self.sequence.type != 'incremental':
            if exist:
                self.delete_sql_sequence()
            return
        if not exist:
            self.create_sql_sequence(number_next)
            return
        if number_next is None:
            number_next = self.number_next
        transaction.database.sequence_update(transaction.connection,
            self._sql_sequence_name, self.sequence.number_increment,
            number_next)

    def delete_sql_sequence(self):
        'Delete the SQL sequence'
        transaction = Transaction()
        if self.sequence.type != 'incremental':
            return
        transaction.database.sequence_delete(
            transaction.connection, self._sql_sequence_name)

    def get_id(self, _lock=False):
        Sequence = Pool().get('ir.sequence')

        if _lock:
            transaction = Transaction()
            database = transaction.database
            connection = transaction.connection
            if not database.has_select_for():
                database.lock(connection, self._table)
            else:
                table = self.__table__()
                query = table.select(Literal(1),
                    where=table.id == self.id,
                    for_=For('UPDATE', nowait=True))
                cursor = connection.cursor()
                cursor.execute(*query)
        date = Transaction().context.get('date')
        return '%s%s%s' % (
            Sequence._process(self.sequence.prefix, date=date),
            self._get_sequence(),
            Sequence._process(self.sequence.suffix, date=date),
            )

    def _get_sequence(self):
        if self.sequence.type == 'incremental':
            if sql_sequence and not self._strict:
                cursor = Transaction().connection.cursor()
                cursor.execute('SELECT nextval(\'"%s"\')'
                    % self._sql_sequence_name)
                number_next, = cursor.fetchone()
            else:
                # Pre-fetch number_next
                number_next = self.number_next_internal

                self.write([self], {
                        'number_next_internal': (number_next
                            + self.sequence.number_increment),
                        })
            return '%%0%sd' % self.sequence.padding % number_next
        else:
            raise NotImplementedError()

    def match(self, pattern):
        date = Transaction().context.get('date')
        if not date:
            return False
        return self.start_date <= date <= self.end_date


class SequenceStrict(metaclass=PoolMeta):
    __name__ = 'ir.sequence.strict'

    # needed due to both models share form view
    periods = fields.Function(
        fields.One2Many('ir.sequence.period', None, 'Periods',
            states={'invisible': Bool(True)}),
        'get_periods')

    def get_periods(self, name=None):
        return []