author | Sylvain Thénault <sylvain.thenault@logilab.fr> |
Fri, 10 Mar 2017 17:46:06 +0100 | |
changeset 12038 | 3c60180481ac |
parent 11963 | 64ecd4d96ac7 |
child 12355 | c703dc95c82e |
permissions | -rw-r--r-- |
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[workflow] Utilities for declarative definition of workflows
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# copyright 2017 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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"""Workflow setup utilities. |
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|
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These functions work with a declarative workflow definition: |
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|
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.. code-block:: python |
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|
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{ |
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'etypes': 'CWGroup', |
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'default': True, |
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'initial_state': u'draft', |
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'states': [u'draft', u'published'], |
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'transitions': { |
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u'publish': { |
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'fromstates': u'draft', |
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'tostate': u'published', |
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'requiredgroups': u'managers' |
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'conditions': ( |
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'U in_group X', |
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'X owned_by U' |
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) |
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} |
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} |
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} |
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.. autofunction:: setup_workflow |
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.. autofunction:: cleanupworkflow |
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""" |
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import collections |
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from six import text_type |
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from cubicweb import NoResultError |
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def get_tuple_or_list(value): |
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if value is None: |
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return None |
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if not isinstance(value, (tuple, list)): |
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value = (value,) |
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return value |
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def cleanupworkflow(cnx, wf, wfdef): |
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"""Cleanup an existing workflow by removing the states and transitions that |
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do not exist in the given definition. |
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:param cnx: A connexion with enough permissions to define a workflow |
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:param wf: A `Workflow` entity |
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:param wfdef: A workflow definition |
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""" |
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cnx.execute( |
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'DELETE State S WHERE S state_of WF, WF eid %%(wf)s, ' |
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'NOT S name IN (%s)' % ( |
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', '.join('"%s"' % s for s in wfdef['states'])), |
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{'wf': wf.eid}) |
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|
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cnx.execute( |
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'DELETE Transition T WHERE T transition_of WF, WF eid %%(wf)s, ' |
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'NOT T name IN (%s)' % ( |
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', '.join('"%s"' % s for s in wfdef['transitions'])), |
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{'wf': wf.eid}) |
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def setup_workflow(cnx, name, wfdef, cleanup=True): |
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"""Create or update a workflow definition so it matches the given |
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definition. |
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|
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:param cnx: A connexion with enough permissions to define a workflow |
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:param name: The workflow name. Used to create the `Workflow` entity, or |
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to find an existing one. |
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:param wfdef: A workflow definition. |
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:param cleanup: Remove extra states and transitions. Can be done separatly |
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by calling :func:`cleanupworkflow`. |
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:return: The created/updated workflow entity |
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""" |
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name = text_type(name) |
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try: |
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wf = cnx.find('Workflow', name=name).one() |
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except NoResultError: |
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wf = cnx.create_entity('Workflow', name=name) |
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|
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etypes = get_tuple_or_list(wfdef['etypes']) |
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cnx.execute('DELETE WF workflow_of ETYPE WHERE WF eid %%(wf)s, ' |
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'NOT ETYPE name IN (%s)' % ','.join('"%s"' for e in etypes), |
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{'wf': wf.eid}) |
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cnx.execute('SET WF workflow_of ETYPE WHERE' |
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' NOT WF workflow_of ETYPE, WF eid %%(wf)s, ETYPE name IN (%s)' |
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% ','.join('"%s"' % e for e in etypes), |
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{'wf': wf.eid}) |
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if wfdef['default']: |
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cnx.execute( |
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'SET ETYPE default_workflow X ' |
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'WHERE ' |
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'NOT ETYPE default_workflow X, ' |
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'X eid %%(x)s, ETYPE name IN (%s)' % ','.join( |
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'"%s"' % e for e in etypes), |
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{'x': wf.eid}) |
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states = {} |
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states_transitions = collections.defaultdict(list) |
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for state in wfdef['states']: |
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st = wf.state_by_name(state) or wf.add_state(state) |
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states[state] = st |
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122 |
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if 'initial_state' in wfdef: |
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wf.cw_set(initial_state=states[wfdef['initial_state']]) |
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for trname, trdef in wfdef['transitions'].items(): |
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tr = (wf.transition_by_name(trname) or |
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cnx.create_entity('Transition', name=trname)) |
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tr.cw_set(transition_of=wf) |
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if trdef.get('tostate'): |
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tr.cw_set(destination_state=states[trdef['tostate']]) |
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fromstates = get_tuple_or_list(trdef.get('fromstates', ())) |
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for stname in fromstates: |
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states_transitions[stname].append(tr) |
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requiredgroups = get_tuple_or_list(trdef.get('requiredgroups', ())) |
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conditions = get_tuple_or_list(trdef.get('conditions', ())) |
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tr.set_permissions(requiredgroups, conditions, reset=True) |
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for stname, transitions in states_transitions.items(): |
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state = states[stname] |
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state.cw_set(allowed_transition=None) |
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state.cw_set(allowed_transition=transitions) |
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if cleanup: |
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cleanupworkflow(cnx, wf, wfdef) |
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return wf |