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signals.py
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signals.py
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# -*- coding: utf-8 -*-
# This file is part of Invenio.
# Copyright (C) 2013, 2014 CERN.
#
# Invenio is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2 of the
# License, or (at your option) any later version.
#
# Invenio 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
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Invenio; if not, write to the Free Software Foundation, Inc.,
# 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
"""
Invenio signal utilities.
This module defines Invenio-wide signals
"""
from blinker import Namespace
_signals = Namespace()
# Custom Flask signals
before_handle_user_exception = _signals.signal(
'before-handle-user-exception')
"""
This signal is sent right before user exception handler is called.
"""
# WebSearch signals
websearch_before_search = _signals.signal(
'websearch-before-search')
"""
This signal is sent right before search handler is called.
"""
websearch_before_browse = _signals.signal(
'websearch-before-browse')
"""
This signal is sent right before browse handler is called.
"""
webcoll_after_webpage_cache_update = _signals.signal(
'webcoll-after-webpage-cache-update')
"""
This signal is sent right after webcoll runs webpage cache update.
It is passed the collection to be sent named `response`.
Example subscriber::
def clear_additional_cache(sender, collection=None, lang=None):
pass
from invenio.base.signals import webcoll_after_webpage_cache_update
from flask import current_app
webcoll_after_webpage_cache_update.connect(
clear_additional_cache,
current_app._get_current_object()
)
"""
webcoll_after_reclist_cache_update = _signals.signal(
'webcoll_after_reclist_cache_update')
"""
This signal is sent right after webcoll runs reclist cache update.
It passes all updated collections.
"""
pre_command = _signals.signal('pre-command')
"""
This signal is sent right before any inveniomanage command is executed.
Note that any positional arguments (sometimes called as ``*args``), will be
received as a keyword argument called ``args``.
Sample subscriber:
.. code-block:: python
def backup_database(sender, **kwargs):
pass
from invenio.base.signals import pre_command
from invenio.base.scripts.database import drop
pre_command.connect(
backup_database,
sender=drop
)
"""
post_command = _signals.signal('post-command')
"""
This signal is sent right after any inveniomanage command is executed.
Example subscriber::
def modify_demosite(sender, *args, **kwargs):
pass
from invenio.base.signals import post_command
from invenio.base.scripts.database import demosite
pre_command.connect(
modify_demosite,
sender=demosite
)
"""
# Record related signals
record_before_create = _signals.signal(
'record-before-create')
"""
This signal is sent before record is created.
"""
record_after_create = _signals.signal(
'record-after-create')
"""
This signal is sent after record is created.
"""
record_before_update = _signals.signal(
'record-before-update')
"""
This signal is sent before record is updated.
"""
record_after_update = _signals.signal(
'record-after-update')
"""
This signal is sent after record is updated.
"""
pre_template_render = _signals.signal('pre-template-render')
"""
This signal is sent before *some* templates are rendered, an allows
customization of the template context.
Sender is the blueprint view name (e.g. 'record.metadata'). Extra data
passed in depends on blueprint view.
"""

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