author | Julien Cristau <julien.cristau@logilab.fr> |
Fri, 20 Feb 2015 16:17:51 +0100 | |
changeset 10317 | b81adb5e32f9 |
parent 9632 | c60c8dec0e0e |
child 10351 | 91e63306e277 |
permissions | -rw-r--r-- |
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# copyright 2003-2013 LOGILAB S.A. (Paris, FRANCE), all rights reserved. |
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# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr |
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# |
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# This file is part of CubicWeb. |
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# |
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# CubicWeb is free software: you can redistribute it and/or modify it under the |
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# terms of the GNU Lesser General Public License as published by the Free |
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# Software Foundation, either version 2.1 of the License, or (at your option) |
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# any later version. |
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# |
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# CubicWeb is distributed in the hope that it will be useful, but WITHOUT |
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
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# FOR A PARTICULAR PURPOSE. See the GNU Lesser 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 Lesser General Public License along |
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# with CubicWeb. If not, see <http://www.gnu.org/licenses/>. |
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"""some hooks to handle notification on entity's changes""" |
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__docformat__ = "restructuredtext en" |
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from logilab.common.textutils import normalize_text |
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from logilab.common.deprecation import deprecated |
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from cubicweb import RegistryNotFound |
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from cubicweb.predicates import is_instance |
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from cubicweb.server import hook |
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from cubicweb.sobjects.supervising import SupervisionMailOp |
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@deprecated('[3.17] use notify_on_commit instead') |
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def RenderAndSendNotificationView(cnx, view, viewargs=None): |
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notify_on_commit(cnx, view, viewargs) |
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def notify_on_commit(cnx, view, viewargs=None): |
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"""register a notification view (see |
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:class:`~cubicweb.sobjects.notification.NotificationView`) to be sent at |
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post-commit time, ie only if the transaction has succeeded. |
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`viewargs` is an optional dictionary containing extra argument to be given |
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to :meth:`~cubicweb.sobjects.notification.NotificationView.render_and_send` |
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""" |
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if viewargs is None: |
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viewargs = {} |
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notif_op = _RenderAndSendNotificationOp.get_instance(cnx) |
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notif_op.add_data((view, viewargs)) |
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class _RenderAndSendNotificationOp(hook.DataOperationMixIn, hook.Operation): |
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"""End of the notification chain. Do render and send views after commit |
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All others Operations end up adding data to this Operation. |
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The notification are done on ``postcommit_event`` to make sure to prevent |
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sending notification about rolled back data. |
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""" |
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containercls = list |
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def postcommit_event(self): |
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deleted = self.cnx.deleted_in_transaction |
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for view, viewargs in self.get_data(): |
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if view.cw_rset is not None: |
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if not view.cw_rset: |
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# entity added and deleted in the same transaction |
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# (cache effect) |
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continue |
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elif deleted(view.cw_rset[view.cw_row or 0][view.cw_col or 0]): |
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# entity added and deleted in the same transaction |
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continue |
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try: |
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view.render_and_send(**viewargs) |
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except Exception: |
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# error in post commit are not propagated |
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# We keep this logic here to prevent a small notification error |
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# to prevent them all. |
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self.exception('Notification failed') |
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class NotificationHook(hook.Hook): |
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__abstract__ = True |
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category = 'notification' |
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def select_view(self, vid, rset, row=0, col=0): |
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try: |
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return self._cw.vreg['views'].select_or_none(vid, self._cw, rset=rset, |
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row=row, col=col) |
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except RegistryNotFound: # can happen in some config |
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# (e.g. repo only config with no |
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# notification views registered by |
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# the instance's cubes) |
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return None |
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class StatusChangeHook(NotificationHook): |
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"""notify when a workflowable entity has its state modified""" |
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__regid__ = 'notifystatuschange' |
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__select__ = NotificationHook.__select__ & is_instance('TrInfo') |
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99 |
events = ('after_add_entity',) |
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100 |
|
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101 |
def __call__(self): |
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entity = self.entity |
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103 |
if not entity.from_state: # not a transition |
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104 |
return |
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105 |
rset = entity.related('wf_info_for') |
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view = self.select_view('notif_status_change', rset=rset, row=0) |
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107 |
if view is None: |
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108 |
return |
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comment = entity.printable_value('comment', format='text/plain') |
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110 |
# XXX don't try to wrap rest until we've a proper transformation (see |
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111 |
# #103822) |
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112 |
if comment and entity.comment_format != 'text/rest': |
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113 |
comment = normalize_text(comment, 80) |
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viewargs = {'comment': comment, |
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115 |
'previous_state': entity.previous_state.name, |
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'current_state': entity.new_state.name} |
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notify_on_commit(self._cw, view, viewargs=viewargs) |
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118 |
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119 |
class RelationChangeHook(NotificationHook): |
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__regid__ = 'notifyrelationchange' |
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121 |
events = ('before_add_relation', 'after_add_relation', |
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122 |
'before_delete_relation', 'after_delete_relation') |
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123 |
|
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124 |
def __call__(self): |
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125 |
"""if a notification view is defined for the event, send notification |
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126 |
email defined by the view |
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127 |
""" |
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128 |
rset = self._cw.eid_rset(self.eidfrom) |
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view = self.select_view('notif_%s_%s' % (self.event, self.rtype), |
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130 |
rset=rset, row=0) |
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131 |
if view is None: |
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132 |
return |
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133 |
notify_on_commit(self._cw, view) |
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134 |
|
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135 |
|
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136 |
class EntityChangeHook(NotificationHook): |
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137 |
"""if a notification view is defined for the event, send notification |
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138 |
email defined by the view |
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139 |
""" |
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140 |
__regid__ = 'notifyentitychange' |
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141 |
events = ('after_add_entity', 'after_update_entity') |
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142 |
|
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143 |
def __call__(self): |
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144 |
rset = self.entity.as_rset() |
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145 |
view = self.select_view('notif_%s' % self.event, rset=rset, row=0) |
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146 |
if view is None: |
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147 |
return |
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148 |
notify_on_commit(self._cw, view) |
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149 |
|
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150 |
|
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151 |
class EntityUpdatedNotificationOp(hook.SingleLastOperation): |
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152 |
"""scrap all changed entity to prepare a Notification Operation for them""" |
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153 |
|
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154 |
def precommit_event(self): |
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155 |
# precommit event that creates postcommit operation |
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156 |
cnx = self.cnx |
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157 |
for eid in cnx.transaction_data['changes']: |
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158 |
view = cnx.vreg['views'].select('notif_entity_updated', cnx, |
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159 |
rset=cnx.eid_rset(eid), |
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160 |
row=0) |
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161 |
notify_on_commit(self.cnx, view, |
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162 |
viewargs={'changes': cnx.transaction_data['changes'][eid]}) |
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163 |
|
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164 |
|
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165 |
class EntityUpdateHook(NotificationHook): |
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166 |
__regid__ = 'notifentityupdated' |
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167 |
__abstract__ = True # do not register by default |
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168 |
__select__ = NotificationHook.__select__ & hook.from_dbapi_query() |
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169 |
events = ('before_update_entity',) |
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170 |
skip_attrs = set() |
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171 |
|
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172 |
def __call__(self): |
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173 |
cnx = self._cw |
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174 |
if cnx.added_in_transaction(self.entity.eid): |
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175 |
return # entity is being created |
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176 |
# then compute changes |
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177 |
attrs = [k for k in self.entity.cw_edited |
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178 |
if not k in self.skip_attrs] |
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179 |
if not attrs: |
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180 |
return |
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181 |
changes = cnx.transaction_data.setdefault('changes', {}) |
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182 |
thisentitychanges = changes.setdefault(self.entity.eid, set()) |
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183 |
rqlsel, rqlrestr = [], ['X eid %(x)s'] |
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184 |
for i, attr in enumerate(attrs): |
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185 |
var = chr(65+i) |
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186 |
rqlsel.append(var) |
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187 |
rqlrestr.append('X %s %s' % (attr, var)) |
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188 |
rql = 'Any %s WHERE %s' % (','.join(rqlsel), ','.join(rqlrestr)) |
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189 |
rset = cnx.execute(rql, {'x': self.entity.eid}) |
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190 |
for i, attr in enumerate(attrs): |
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191 |
oldvalue = rset[0][i] |
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192 |
newvalue = self.entity.cw_edited[attr] |
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193 |
if oldvalue != newvalue: |
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194 |
thisentitychanges.add((attr, oldvalue, newvalue)) |
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195 |
if thisentitychanges: |
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196 |
EntityUpdatedNotificationOp(cnx) |
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# supervising ################################################################## |
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class SomethingChangedHook(NotificationHook): |
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__regid__ = 'supervising' |
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__select__ = NotificationHook.__select__ & hook.from_dbapi_query() |
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events = ('before_add_relation', 'before_delete_relation', |
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'after_add_entity', 'before_update_entity') |
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def __call__(self): |
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dest = self._cw.vreg.config['supervising-addrs'] |
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if not dest: # no supervisors, don't do this for nothing... |
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return |
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if self._call(): |
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SupervisionMailOp(self._cw) |
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def _call(self): |
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event = self.event.split('_', 1)[1] |
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if event == 'update_entity': |
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if self._cw.added_in_transaction(self.entity.eid): |
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return False |
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if self.entity.e_schema == 'CWUser': |
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if not (frozenset(self.entity.cw_edited) |
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- frozenset(('eid', 'modification_date', |
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'last_login_time'))): |
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# don't record last_login_time update which are done |
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# automatically at login time |
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return False |
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self._cw.transaction_data.setdefault('pendingchanges', []).append( |
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(event, self)) |
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return True |
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class EntityDeleteHook(SomethingChangedHook): |
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__regid__ = 'supervisingentitydel' |
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events = ('before_delete_entity',) |
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def _call(self): |
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try: |
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title = self.entity.dc_title() |
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except Exception: |
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# may raise an error during deletion process, for instance due to |
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# missing required relation |
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title = '#%s' % self.entity.eid |
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self._cw.transaction_data.setdefault('pendingchanges', []).append( |
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('delete_entity', (self.entity.eid, self.entity.cw_etype, title))) |
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return True |