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106 lines
3.5 KiB
Python
106 lines
3.5 KiB
Python
#
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# This file is part of pretix (Community Edition).
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#
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# Copyright (C) 2014-2020 Raphael Michel and contributors
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# Copyright (C) 2020-2021 rami.io GmbH and contributors
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#
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# This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General
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# Public License as published by the Free Software Foundation in version 3 of the License.
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#
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# ADDITIONAL TERMS APPLY: Pursuant to Section 7 of the GNU Affero General Public License, additional terms are
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# applicable granting you additional permissions and placing additional restrictions on your usage of this software.
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# Please refer to the pretix LICENSE file to obtain the full terms applicable to this work. If you did not receive
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# this file, see <https://pretix.eu/about/en/license>.
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#
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# This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
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# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero 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 Affero General Public License along with this program. If not, see
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# <https://www.gnu.org/licenses/>.
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#
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import contextlib
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from django.db import transaction
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from django.db.models import Aggregate, Field, Lookup
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class DummyRollbackException(Exception):
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pass
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@contextlib.contextmanager
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def rolledback_transaction():
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"""
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This context manager runs your code in a database transaction that will be rolled back in the end.
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This can come in handy to simulate the effects of a database operation that you do not actually
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want to perform.
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Note that rollbacks are a very slow operation on most database backends. Also, long-running
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transactions can slow down other operations currently running and you should not use this
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in a place that is called frequently.
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"""
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try:
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with transaction.atomic():
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yield
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raise DummyRollbackException()
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except DummyRollbackException:
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pass
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else:
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raise Exception('Invalid state, should have rolled back.')
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@contextlib.contextmanager
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def casual_reads():
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"""
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Kept for backwards compatibility.
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"""
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yield
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class GroupConcat(Aggregate):
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function = 'group_concat'
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template = '%(function)s(%(field)s, "%(separator)s")'
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def __init__(self, *expressions, **extra):
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if 'separator' not in extra:
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# For PostgreSQL separator is an obligatory
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extra.update({'separator': ','})
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super().__init__(*expressions, **extra)
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def as_postgresql(self, compiler, connection):
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return super().as_sql(
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compiler, connection,
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function='string_agg',
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template="%(function)s(%(field)s::text, '%(separator)s')",
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)
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class ReplicaRouter:
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def db_for_read(self, model, **hints):
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return 'default'
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def db_for_write(self, model, **hints):
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return 'default'
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def allow_relation(self, obj1, obj2, **hints):
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db_list = ('default', 'replica')
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if obj1._state.db in db_list and obj2._state.db in db_list:
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return True
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return None
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def allow_migrate(self, db, app_label, model_name=None, **hintrs):
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return True
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@Field.register_lookup
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class NotEqual(Lookup):
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lookup_name = 'ne'
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def as_sql(self, compiler, connection):
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lhs, lhs_params = self.process_lhs(compiler, connection)
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rhs, rhs_params = self.process_rhs(compiler, connection)
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params = lhs_params + rhs_params
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return '%s <> %s' % (lhs, rhs), params
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