root / snf-astakos-app / astakos / im / notification_xctx.py @ 469d0997
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# Copyright 2013 GRNET S.A. All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or
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# without modification, are permitted provided that the following
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# conditions are met:
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#
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# 1. Redistributions of source code must retain the above
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# copyright notice, this list of conditions and the following
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# disclaimer.
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#
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# 2. Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following
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# disclaimer in the documentation and/or other materials
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# provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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# The views and conclusions contained in the software and
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# documentation are those of the authors and should not be
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# interpreted as representing official policies, either expressed
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# or implied, of GRNET S.A.
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from synnefo.lib.db.xctx import TransactionContext |
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from astakos.im.retry_xctx import RetryTransactionHandler |
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from astakos.im.notifications import Notification |
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# USAGE
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# =====
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# @notification_transaction_context(notify=False)
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# def a_view(args, ctx=None):
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# ...
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# if ctx:
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# ctx.mark_rollback()
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# ...
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# return http response
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#
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# OR (more cleanly)
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#
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# def a_view(args):
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# with notification_transaction_context(notify=False) as ctx:
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# ...
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# ctx.mark_rollback()
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# ...
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# return http response
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def notification_transaction_context(**kwargs): |
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return RetryTransactionHandler(ctx=NotificationTransactionContext, **kwargs)
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class NotificationTransactionContext(TransactionContext): |
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def __init__(self, notify=True, **kwargs): |
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self._notifications = []
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self._messages = []
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self._notify = notify
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TransactionContext.__init__(self, **kwargs)
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def register(self, o): |
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if isinstance(o, dict): |
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msg = o.get('msg', None) |
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if msg is not None: |
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if isinstance(msg, basestring): |
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self.queue_message(msg)
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notif = o.get('notif', None) |
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if notif is not None: |
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if isinstance(notif, Notification): |
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self.queue_notification(notif)
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if o.has_key('value'): |
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return o['value'] |
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return o
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def queue_message(self, m): |
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self._messages.append(m)
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def queue_notification(self, n): |
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self._notifications.append(n)
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def _send_notifications(self): |
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if self._notifications is None: |
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return
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# send mail
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def postprocess(self): |
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if self._notify: |
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self._send_notifications()
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TransactionContext.postprocess(self)
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