author | Sylvain Thénault <sylvain.thenault@logilab.fr> |
Mon, 25 Jan 2010 19:36:04 +0100 | |
changeset 4344 | 066e7884e57d |
parent 4307 | 7fba9c34c88f |
child 4644 | 021035b9a7ab |
permissions | -rw-r--r-- |
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"""Core hooks: workflow related hooks |
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|
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:organization: Logilab |
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:copyright: 2001-2010 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2. |
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr |
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:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses |
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""" |
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__docformat__ = "restructuredtext en" |
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from datetime import datetime |
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from cubicweb import RepositoryError, ValidationError |
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from cubicweb.interfaces import IWorkflowable |
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from cubicweb.selectors import implements |
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from cubicweb.server import hook |
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from cubicweb.entities.wfobjs import WorkflowTransition |
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def _change_state(session, x, oldstate, newstate): |
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nocheck = session.transaction_data.setdefault('skip-security', set()) |
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nocheck.add((x, 'in_state', oldstate)) |
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nocheck.add((x, 'in_state', newstate)) |
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# delete previous state first in case we're using a super session, |
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# unless in_state isn't stored in the system source |
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fromsource = session.describe(x)[1] |
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if fromsource == 'system' or \ |
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not session.repo.sources_by_uri[fromsource].support_relation('in_state'): |
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session.delete_relation(x, 'in_state', oldstate) |
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session.add_relation(x, 'in_state', newstate) |
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# operations ################################################################### |
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class _SetInitialStateOp(hook.Operation): |
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"""make initial state be a default state""" |
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def precommit_event(self): |
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session = self.session |
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entity = self.entity |
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# if there is an initial state and the entity's state is not set, |
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# use the initial state as a default state |
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if not (session.deleted_in_transaction(entity.eid) or entity.in_state) \ |
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and entity.current_workflow: |
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state = entity.current_workflow.initial |
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if state: |
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# use super session to by-pass security checks |
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session.super_session.add_relation(entity.eid, 'in_state', |
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state.eid) |
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class _FireAutotransitionOp(hook.Operation): |
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"""try to fire auto transition after state changes""" |
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def precommit_event(self): |
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session = self.session |
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entity = self.entity |
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autotrs = list(entity.possible_transitions('auto')) |
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if autotrs: |
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assert len(autotrs) == 1 |
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entity.fire_transition(autotrs[0]) |
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class _WorkflowChangedOp(hook.Operation): |
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"""fix entity current state when changing its workflow""" |
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def precommit_event(self): |
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# notice that enforcement that new workflow apply to the entity's type is |
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# done by schema rule, no need to check it here |
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session = self.session |
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pendingeids = session.transaction_data.get('pendingeids', ()) |
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if self.eid in pendingeids: |
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return |
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entity = session.entity_from_eid(self.eid) |
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# check custom workflow has not been rechanged to another one in the same |
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# transaction |
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mainwf = entity.main_workflow |
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if mainwf.eid == self.wfeid: |
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deststate = mainwf.initial |
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if not deststate: |
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msg = session._('workflow has no initial state') |
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raise ValidationError(entity.eid, {'custom_workflow': msg}) |
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if mainwf.state_by_eid(entity.current_state.eid): |
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# nothing to do |
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return |
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# if there are no history, simply go to new workflow's initial state |
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if not entity.workflow_history: |
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if entity.current_state.eid != deststate.eid: |
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_change_state(session, entity.eid, |
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entity.current_state.eid, deststate.eid) |
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return |
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msg = session._('workflow changed to "%s"') |
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msg %= session._(mainwf.name) |
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session.transaction_data[(entity.eid, 'customwf')] = self.wfeid |
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entity.change_state(deststate, msg, u'text/plain') |
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class _CheckTrExitPoint(hook.Operation): |
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99 |
def precommit_event(self): |
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tr = self.session.entity_from_eid(self.treid) |
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outputs = set() |
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102 |
for ep in tr.subworkflow_exit: |
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if ep.subwf_state.eid in outputs: |
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msg = self.session._("can't have multiple exits on the same state") |
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raise ValidationError(self.treid, {'subworkflow_exit': msg}) |
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outputs.add(ep.subwf_state.eid) |
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107 |
|
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108 |
|
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class _SubWorkflowExitOp(hook.Operation): |
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110 |
|
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def precommit_event(self): |
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session = self.session |
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forentity = self.forentity |
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trinfo = self.trinfo |
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# we're in a subworkflow, check if we've reached an exit point |
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wftr = forentity.subworkflow_input_transition() |
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if wftr is None: |
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118 |
# inconsistency detected |
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msg = session._("state doesn't belong to entity's current workflow") |
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raise ValidationError(self.trinfo.eid, {'to_state': msg}) |
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tostate = wftr.get_exit_point(forentity, trinfo['to_state']) |
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if tostate is not None: |
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# reached an exit point |
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msg = session._('exiting from subworkflow %s') |
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msg %= session._(forentity.current_workflow.name) |
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session.transaction_data[(forentity.eid, 'subwfentrytr')] = True |
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127 |
# XXX iirk |
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req = forentity._cw |
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forentity._cw = session.super_session |
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130 |
try: |
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trinfo = forentity.change_state(tostate, msg, u'text/plain', |
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132 |
tr=wftr) |
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133 |
finally: |
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forentity._cw = req |
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135 |
|
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136 |
|
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137 |
# hooks ######################################################################## |
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138 |
|
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139 |
class WorkflowHook(hook.Hook): |
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140 |
__abstract__ = True |
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141 |
category = 'worfklow' |
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142 |
|
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143 |
|
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144 |
class SetInitialStateHook(WorkflowHook): |
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__regid__ = 'wfsetinitial' |
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__select__ = WorkflowHook.__select__ & implements(IWorkflowable) |
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events = ('after_add_entity',) |
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148 |
|
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149 |
def __call__(self): |
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_SetInitialStateOp(self._cw, entity=self.entity) |
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151 |
|
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152 |
|
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153 |
class PrepareStateChangeHook(WorkflowHook): |
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154 |
"""record previous state information""" |
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155 |
__regid__ = 'cwdelstate' |
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156 |
__select__ = WorkflowHook.__select__ & hook.match_rtype('in_state') |
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157 |
events = ('before_delete_relation',) |
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158 |
|
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159 |
def __call__(self): |
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160 |
self._cw.transaction_data.setdefault('pendingrelations', []).append( |
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161 |
(self.eidfrom, self.rtype, self.eidto)) |
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162 |
|
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163 |
|
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164 |
class FireTransitionHook(WorkflowHook): |
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165 |
"""check the transition is allowed, add missing information. Expect that: |
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166 |
* wf_info_for inlined relation is set |
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167 |
* by_transition or to_state (managers only) inlined relation is set |
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168 |
""" |
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169 |
__regid__ = 'wffiretransition' |
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170 |
__select__ = WorkflowHook.__select__ & implements('TrInfo') |
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171 |
events = ('before_add_entity',) |
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172 |
|
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173 |
def __call__(self): |
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174 |
session = self._cw |
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175 |
entity = self.entity |
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176 |
# first retreive entity to which the state change apply |
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177 |
try: |
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178 |
foreid = entity['wf_info_for'] |
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179 |
except KeyError: |
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180 |
msg = session._('mandatory relation') |
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181 |
raise ValidationError(entity.eid, {'wf_info_for': msg}) |
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182 |
forentity = session.entity_from_eid(foreid) |
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183 |
# then check it has a workflow set, unless we're in the process of changing |
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184 |
# entity's workflow |
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185 |
if session.transaction_data.get((forentity.eid, 'customwf')): |
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186 |
wfeid = session.transaction_data[(forentity.eid, 'customwf')] |
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187 |
wf = session.entity_from_eid(wfeid) |
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188 |
else: |
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189 |
wf = forentity.current_workflow |
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190 |
if wf is None: |
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191 |
msg = session._('related entity has no workflow set') |
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192 |
raise ValidationError(entity.eid, {None: msg}) |
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193 |
# then check it has a state set |
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194 |
fromstate = forentity.current_state |
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195 |
if fromstate is None: |
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196 |
msg = session._('related entity has no state') |
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197 |
raise ValidationError(entity.eid, {None: msg}) |
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198 |
# True if we are coming back from subworkflow |
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199 |
swtr = session.transaction_data.pop((forentity.eid, 'subwfentrytr'), None) |
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200 |
cowpowers = session.is_super_session or 'managers' in session.user.groups |
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201 |
# no investigate the requested state change... |
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202 |
try: |
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203 |
treid = entity['by_transition'] |
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204 |
except KeyError: |
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205 |
# no transition set, check user is a manager and destination state |
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206 |
# is specified (and valid) |
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207 |
if not cowpowers: |
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208 |
msg = session._('mandatory relation') |
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209 |
raise ValidationError(entity.eid, {'by_transition': msg}) |
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|
210 |
deststateeid = entity.get('to_state') |
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|
211 |
if not deststateeid: |
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212 |
msg = session._('mandatory relation') |
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213 |
raise ValidationError(entity.eid, {'by_transition': msg}) |
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214 |
deststate = wf.state_by_eid(deststateeid) |
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215 |
if deststate is None: |
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216 |
msg = session._("state doesn't belong to entity's workflow") |
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217 |
raise ValidationError(entity.eid, {'to_state': msg}) |
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218 |
else: |
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219 |
# check transition is valid and allowed, unless we're coming back |
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220 |
# from subworkflow |
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221 |
tr = session.entity_from_eid(treid) |
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222 |
if swtr is None: |
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223 |
if tr is None: |
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224 |
msg = session._("transition doesn't belong to entity's workflow") |
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225 |
raise ValidationError(entity.eid, {'by_transition': msg}) |
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226 |
if not tr.has_input_state(fromstate): |
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227 |
msg = session._("transition %(tr)s isn't allowed from %(st)s") % { |
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228 |
'tr': session._(tr.name), 'st': session._(fromstate.name)} |
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229 |
raise ValidationError(entity.eid, {'by_transition': msg}) |
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230 |
if not tr.may_be_fired(foreid): |
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231 |
msg = session._("transition may not be fired") |
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232 |
raise ValidationError(entity.eid, {'by_transition': msg}) |
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233 |
if entity.get('to_state'): |
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234 |
deststateeid = entity['to_state'] |
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235 |
if not cowpowers and deststateeid != tr.destination().eid: |
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236 |
msg = session._("transition isn't allowed") |
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237 |
raise ValidationError(entity.eid, {'by_transition': msg}) |
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238 |
if swtr is None: |
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239 |
deststate = session.entity_from_eid(deststateeid) |
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240 |
if not cowpowers and deststate is None: |
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241 |
msg = session._("state doesn't belong to entity's workflow") |
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242 |
raise ValidationError(entity.eid, {'to_state': msg}) |
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|
243 |
else: |
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244 |
deststateeid = tr.destination().eid |
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245 |
# everything is ok, add missing information on the trinfo entity |
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246 |
entity['from_state'] = fromstate.eid |
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247 |
entity['to_state'] = deststateeid |
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248 |
nocheck = session.transaction_data.setdefault('skip-security', set()) |
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249 |
nocheck.add((entity.eid, 'from_state', fromstate.eid)) |
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250 |
nocheck.add((entity.eid, 'to_state', deststateeid)) |
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_FireAutotransitionOp(session, entity=forentity) |
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|
252 |
|
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|
253 |
|
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254 |
class FiredTransitionHook(WorkflowHook): |
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255 |
"""change related entity state""" |
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256 |
__regid__ = 'wffiretransition' |
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257 |
__select__ = WorkflowHook.__select__ & implements('TrInfo') |
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258 |
events = ('after_add_entity',) |
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|
259 |
|
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260 |
def __call__(self): |
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|
261 |
trinfo = self.entity |
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|
262 |
_change_state(self._cw, trinfo['wf_info_for'], |
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|
263 |
trinfo['from_state'], trinfo['to_state']) |
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|
264 |
forentity = self._cw.entity_from_eid(trinfo['wf_info_for']) |
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|
265 |
assert forentity.current_state.eid == trinfo['to_state'] |
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266 |
if forentity.main_workflow.eid != forentity.current_workflow.eid: |
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267 |
_SubWorkflowExitOp(self._cw, forentity=forentity, trinfo=trinfo) |
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268 |
|
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|
269 |
|
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270 |
class CheckInStateChangeAllowed(WorkflowHook): |
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271 |
"""check state apply, in case of direct in_state change using unsafe_execute |
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272 |
""" |
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273 |
__regid__ = 'wfcheckinstate' |
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274 |
__select__ = WorkflowHook.__select__ & hook.match_rtype('in_state') |
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275 |
events = ('before_add_relation',) |
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276 |
|
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277 |
def __call__(self): |
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278 |
session = self._cw |
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279 |
nocheck = session.transaction_data.get('skip-security', ()) |
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280 |
if (self.eidfrom, 'in_state', self.eidto) in nocheck: |
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281 |
# state changed through TrInfo insertion, so we already know it's ok |
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282 |
return |
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283 |
entity = session.entity_from_eid(self.eidfrom) |
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284 |
mainwf = entity.main_workflow |
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285 |
if mainwf is None: |
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286 |
msg = session._('entity has no workflow set') |
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287 |
raise ValidationError(entity.eid, {None: msg}) |
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288 |
for wf in mainwf.iter_workflows(): |
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289 |
if wf.state_by_eid(self.eidto): |
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290 |
break |
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|
291 |
else: |
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292 |
msg = session._("state doesn't belong to entity's workflow. You may " |
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"want to set a custom workflow for this entity first.") |
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raise ValidationError(self.eidfrom, {'in_state': msg}) |
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if entity.current_workflow and wf.eid != entity.current_workflow.eid: |
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msg = session._("state doesn't belong to entity's current workflow") |
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raise ValidationError(self.eidfrom, {'in_state': msg}) |
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class SetModificationDateOnStateChange(WorkflowHook): |
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"""update entity's modification date after changing its state""" |
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__regid__ = 'wfsyncmdate' |
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__select__ = WorkflowHook.__select__ & hook.match_rtype('in_state') |
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events = ('after_add_relation',) |
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|
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def __call__(self): |
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if self._cw.added_in_transaction(self.eidfrom): |
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# new entity, not needed |
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return |
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entity = self._cw.entity_from_eid(self.eidfrom) |
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try: |
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entity.set_attributes(modification_date=datetime.now(), |
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_cw_unsafe=True) |
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except RepositoryError, ex: |
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# usually occurs if entity is coming from a read-only source |
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# (eg ldap user) |
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self.warning('cant change modification date for %s: %s', entity, ex) |
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|
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class CheckWorkflowTransitionExitPoint(WorkflowHook): |
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"""check that there is no multiple exits from the same state""" |
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__regid__ = 'wfcheckwftrexit' |
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__select__ = WorkflowHook.__select__ & hook.match_rtype('subworkflow_exit') |
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events = ('after_add_relation',) |
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|
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def __call__(self): |
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_CheckTrExitPoint(self._cw, treid=self.eidfrom) |
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|
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|
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class SetCustomWorkflow(WorkflowHook): |
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__regid__ = 'wfsetcustom' |
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__select__ = WorkflowHook.__select__ & hook.match_rtype('custom_workflow') |
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events = ('after_add_relation',) |
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|
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def __call__(self): |
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_WorkflowChangedOp(self._cw, eid=self.eidfrom, wfeid=self.eidto) |
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|
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|
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class DelCustomWorkflow(SetCustomWorkflow): |
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__regid__ = 'wfdelcustom' |
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events = ('after_delete_relation',) |
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|
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def __call__(self): |
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entity = self._cw.entity_from_eid(self.eidfrom) |
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typewf = entity.cwetype_workflow() |
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if typewf is not None: |
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_WorkflowChangedOp(self._cw, eid=self.eidfrom, wfeid=typewf.eid) |
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348 |