Synnefo

# Copyright 2013 GRNET S.A. All rights reserved.

#

# Redistribution and use in source and binary forms, with or

# without modification, are permitted provided that the following

# conditions are met:

#

#   1. Redistributions of source code must retain the above

#      copyright notice, this list of conditions and the following

#      disclaimer.

#

#   2. Redistributions in binary form must reproduce the above

#      copyright notice, this list of conditions and the following

#      disclaimer in the documentation and/or other materials

#      provided with the distribution.

#

# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS

# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR

# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF

# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED

# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN

# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

# POSSIBILITY OF SUCH DAMAGE.

#

# The views and conclusions contained in the software and

# documentation are those of the authors and should not be

# interpreted as representing official policies, either expressed

# or implied, of GRNET S.A.

from astakos.im.retry_xctx import RetryTransactionHandler

from astakos.im.notification_xctx import NotificationTransactionContext

from astakos.im.models import sync_projects

from astakos.im.project_error import project_error_view

# USAGE

# =====

# @project_transaction_context(sync=True)

# def a_view(args, ctx=None):

#     ...

#     if ctx:

#         ctx.mark_rollback()

#     ...

#     return http response

#

# OR (more cleanly)

#

# def a_view(args):

#     with project_transaction_context(sync=True) as ctx:

#         ...

#         ctx.mark_rollback()

#         ...

#         return http response

def project_transaction_context(**kwargs):

    return RetryTransactionHandler(ctx=ProjectTransactionContext,

                                   on_fail=project_error_view,

                                   **kwargs)

def cmd_project_transaction_context(**kwargs):

    return RetryTransactionHandler(ctx=ProjectTransactionContext,

                                   **kwargs)

class ProjectTransactionContext(NotificationTransactionContext):

    def __init__(self, sync=False, **kwargs):

        self._sync = sync

        NotificationTransactionContext.__init__(self, **kwargs)

    def postprocess(self):

        if self._sync:

            sync_projects()

        NotificationTransactionContext.postprocess(self)