662 lines
25 KiB
Python
662 lines
25 KiB
Python
#This file is part of Tryton. The COPYRIGHT file at the top level of
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#this repository contains the full copyright notices and license terms.
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from __future__ import with_statement
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import os
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import expr
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import base64
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from trytond.model import ModelView, ModelSQL, fields
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from trytond.report import Report
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from trytond.tools import exec_command_pipe
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from trytond.backend import TableHandler
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from trytond.pyson import Eval, Equal, Not
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from trytond.transaction import Transaction
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class Workflow(ModelSQL, ModelView):
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"Workflow"
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_name = "workflow"
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_table = "wkf"
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_description = __doc__
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name = fields.Char('Name', required=True, translate=True)
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model = fields.Char('Resource Model', required=True, select=1)
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on_create = fields.Boolean('On Create', select=2)
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activities = fields.One2Many('workflow.activity', 'workflow',
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'Activities')
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def __init__(self):
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super(Workflow, self).__init__()
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self._error_messages.update({
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'no_workflow_defined': 'No workflow defined!',
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})
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def init(self, module_name):
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super(Workflow, self).init(module_name)
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cursor = Transaction().cursor
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table = TableHandler(cursor, self, module_name)
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# Migration from 1.2 rename osv into model
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if table.column_exist('osv'):
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cursor.execute('UPDATE "' + self._table + '" ' \
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'SET model = osv')
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table.drop_column('osv', exception=True)
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def default_on_create(self):
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return 1
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Workflow()
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class WorkflowActivity(ModelSQL, ModelView):
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"Workflow activity"
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_name = "workflow.activity"
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_table = "wkf_activity"
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_description = __doc__
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name = fields.Char('Name', required=True, translate=True)
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workflow = fields.Many2One('workflow', 'Workflow', required=True,
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select=1, ondelete='CASCADE')
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split_mode = fields.Selection([
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('XOR', 'Xor'),
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('OR', 'Or'),
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('AND', 'And'),
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], 'Split Mode', required=True)
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join_mode = fields.Selection([
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('XOR', 'Xor'),
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('AND', 'And'),
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], 'Join Mode', required=True)
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kind = fields.Selection([
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('dummy', 'Dummy'),
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('function', 'Function'),
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('subflow', 'Subflow'),
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('stopall', 'Stop All'),
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], 'Kind', required=True)
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action = fields.Text('Action', states={
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'readonly': Equal(Eval('kind'), 'dummy'),
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'required': Equal(Eval('kind'), 'function'),
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})
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flow_start = fields.Boolean('Flow Start')
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flow_stop = fields.Boolean('Flow Stop')
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subflow = fields.Many2One('workflow', 'Subflow', states={
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'readonly': Not(Equal(Eval('kind'), 'subflow')),
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'required': Equal(Eval('kind'), 'subflow'),
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})
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signal_send = fields.Char('Signal (subflow.*)')
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out_transitions = fields.One2Many('workflow.transition', 'act_from',
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'Outgoing transitions')
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in_transitions = fields.One2Many('workflow.transition', 'act_to',
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'Incoming transitions')
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#TODO add a _constraint on subflow without action
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#to have the same model than the workflow
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def default_kind(self):
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return 'dummy'
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def default_join_mode(self):
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return 'XOR'
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def default_split_mode(self):
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return 'XOR'
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def default_flow_start(self):
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return False
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def default_flow_stop(self):
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return False
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WorkflowActivity()
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class WorkflowTransition(ModelSQL, ModelView):
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"Workflow transition"
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_table = "wkf_transition"
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_name = "workflow.transition"
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_rec_name = 'signal'
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_description = __doc__
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trigger_model = fields.Char('Trigger Type')
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trigger_expr_id = fields.Char('Trigger Expr ID')
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signal = fields.Char('Signal (button Name)')
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group = fields.Many2One('res.group', 'Group Required')
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condition = fields.Char('Condition', required=True)
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act_from = fields.Many2One('workflow.activity', 'Source Activity',
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required=True, select=1, ondelete='CASCADE')
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act_to = fields.Many2One('workflow.activity', 'Destination Activity',
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required=True, select=1, ondelete='CASCADE')
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instances = fields.Many2Many('workflow.transition-workflow.instance',
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'trans_id', 'inst_id', 'Instances')
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def default_condition(self):
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return 'True'
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WorkflowTransition()
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class WorkflowInstance(ModelSQL, ModelView):
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"Workflow instance"
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_table = "wkf_instance"
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_name = "workflow.instance"
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_rec_name = 'res_type'
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_description = __doc__
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workflow = fields.Many2One('workflow', 'Workflow', ondelete="RESTRICT",
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select=1)
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uid = fields.Integer('User ID')
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res_id = fields.Integer('Resource ID', required=True, select=1)
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res_type = fields.Char('Resource Model', required=True, select=1)
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state = fields.Char('State', required=True, select=1)
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overflows = fields.One2Many('workflow.workitem', 'subflow',
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'Overflow')
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transitions = fields.Many2Many('workflow.transition-workflow.instance',
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'inst_id', 'trans_id', 'Transitions')
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workitems = fields.One2Many('workflow.workitem', 'instance', 'Workitems')
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def __init__(self):
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super(WorkflowInstance, self).__init__()
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self._error_messages.update({
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'no_instance_defined': 'No workflow instance defined!',
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})
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for i in ('create', 'write', 'delete', 'copy'):
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del self._rpc[i]
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#TODO add a constraint to have only one active instance by resource
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def init(self, module_name):
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super(WorkflowInstance, self).init(module_name)
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table = TableHandler(Transaction().cursor, self, module_name)
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table.index_action(['res_id', 'res_type', 'state'], 'add')
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table.index_action(['res_id', 'workflow'], 'add')
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def fields_get(self, fields_names=None):
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res = super(WorkflowInstance, self).fields_get(
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fields_names=fields_names)
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for field in res:
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res[field]['readonly'] = True
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return res
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def create(self, values):
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activity_obj = self.pool.get('workflow.activity')
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workitem_obj = self.pool.get('workflow.workitem')
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instance_id = super(WorkflowInstance, self).create(values)
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if 'workflow' in values:
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with Transaction().set_user(0):
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activity_ids = activity_obj.search([
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('flow_start', '=', True),
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('workflow', '=', values['workflow']),
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])
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for activity_id in activity_ids:
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workitem_obj.create({
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'activity': activity_id,
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'instance': instance_id,
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'state': 'active',
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})
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instance = self.browse(instance_id)
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self.update(instance)
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return instance_id
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def update(self, instance):
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'''
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'''
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workitem_obj = self.pool.get('workflow.workitem')
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for workitem in instance.workitems:
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workitem_obj.process(workitem)
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instance = self.browse(instance.id)
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return self._update_end(instance)
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def validate(self, instance, signal, force_running=False):
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'''
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'''
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workitem_obj = self.pool.get('workflow.workitem')
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for workitem in instance.workitems:
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workitem_obj.process(workitem, signal=signal,
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force_running=force_running)
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instance = self.browse(instance.id)
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return self._update_end(instance)
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def _update_end(self, instance):
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workitem_obj = self.pool.get('workflow.workitem')
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res = True
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for workitem in instance.workitems:
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if (workitem.state != 'complete') \
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or not workitem.activity.flow_stop:
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res = False
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break
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if res:
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act_names = set()
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for workitem in instance.workitems:
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act_names.add(workitem.activity.name)
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with Transaction().set_user(0):
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self.write(instance.id, {
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'state': 'complete',
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})
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workitem_ids = workitem_obj.search([
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('subflow', '=', instance.id),
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])
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workitem_obj.write(workitem_ids, {
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'state': 'complete',
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})
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for workitem in workitem_obj.browse(workitem_ids):
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for act_name in act_names:
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self.validate(workitem.instance,
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signal='subflow.' + act_name)
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return res
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WorkflowInstance()
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class WorkflowTransitionInstance(ModelSQL):
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"Workflow Transition - Instance"
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_name = 'workflow.transition-workflow.instance'
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_table = 'wkf_witm_trans'
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_description = __doc__
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trans_id = fields.Many2One('workflow.transition', 'Transition',
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ondelete='CASCADE', select=1, required=True)
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inst_id = fields.Many2One('workflow.instance', 'Instance',
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ondelete='CASCADE', select=1, required=True)
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def __init__(self):
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super(WorkflowTransitionInstance, self).__init__()
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for i in ('create', 'write', 'delete', 'copy'):
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del self._rpc[i]
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def fields_get(self, fields_names=None):
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res = super(WorkflowTransitionInstance, self).fields_get(
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fields_names=fields_names)
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for field in res:
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res[field]['readonly'] = True
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return res
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WorkflowTransitionInstance()
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class WorkflowWorkitem(ModelSQL, ModelView):
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"Workflow workitem"
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_table = "wkf_workitem"
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_name = "workflow.workitem"
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_rec_name = 'state'
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_description = __doc__
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activity = fields.Many2One('workflow.activity', 'Activity',
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required=True, ondelete="CASCADE", select=1)
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subflow = fields.Many2One('workflow.instance', 'Subflow',
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ondelete="CASCADE", select=1)
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instance = fields.Many2One('workflow.instance', 'Instance',
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required=True, ondelete="CASCADE", select=1)
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state = fields.Char('State', select=1)
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def __init__(self):
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super(WorkflowWorkitem, self).__init__()
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for i in ('create', 'write', 'delete', 'copy'):
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del self._rpc[i]
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def fields_get(self, fields_names=None):
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res = super(WorkflowWorkitem, self).fields_get(
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fields_names=fields_names)
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for field in res:
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res[field]['readonly'] = True
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return res
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def create(self, values):
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workitem_id = super(WorkflowWorkitem, self).create(values)
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with Transaction().set_user(0):
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workitem = self.browse(workitem_id)
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self.process(workitem)
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return workitem_id
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def process(self, workitem, signal=None, force_running=False):
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'''
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Process a workitem
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:param workitem: a BrowseRecord of the workflow.workitem
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:param signal: the signal
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:param force_running: a boolean
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'''
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trigger_obj = self.pool.get('workflow.trigger')
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activity = workitem.activity
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triggers = False
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if workitem.state == 'active':
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triggers = True
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if not self._execute(workitem, activity):
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return False
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elif workitem.state == 'running':
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pass
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if workitem.state == 'complete' or force_running:
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res = self._split_test(workitem, activity.split_mode, signal)
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triggers = triggers and not res
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if triggers:
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for transition in activity.out_transitions:
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if transition.trigger_model:
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ids = expr.eval_expr( workitem.instance.res_type,
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workitem.instance.res_id,
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transition.trigger_expr_id)
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with Transaction().set_user(0):
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for res_id in ids:
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trigger_obj.create({
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'model': transition.trigger_model,
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'res_id': res_id,
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'instance': workitem.instance.id,
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'workitem': workitem.id,
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})
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return True
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def _state_set(self, workitem, state):
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self.write(workitem.id, {
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'state': state,
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})
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#XXX must be changed with a cache reset on BrowseRecord
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workitem._data[workitem.id]['state'] = state
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def _execute(self, workitem, activity):
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instance_obj = self.pool.get('workflow.instance')
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#send a signal to overflow
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if (workitem.state == 'active') and activity.signal_send:
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for overflow in workitem.overflows:
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instance_obj.validate(overflow.instance, activity.signal_send,
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force_running=True)
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if activity.kind == 'dummy':
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if workitem.state == 'active':
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self._state_set(workitem, 'complete')
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elif activity.kind == 'function':
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if workitem.state == 'active':
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self._state_set(workitem, 'running')
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expr.execute(workitem.instance.res_type,
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workitem.instance.res_id, activity)
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self._state_set(workitem, 'complete')
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elif activity.kind == 'stopall':
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if workitem.state == 'active':
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self._state_set(workitem, 'running')
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ids = self.search([
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('instance', '=', workitem.instance.id),
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('id', '!=', workitem.id),
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])
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#XXX check if delete must not be replace by _state_set 'complete'
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with Transaction().set_user(0):
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self.delete(ids)
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if activity.action:
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expr.execute(workitem.instance.res_type,
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workitem.instance.res_id, activity)
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self._state_set(workitem, 'complete')
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elif activity.kind == 'subflow':
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if workitem.state == 'active':
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self._state_set(workitem, 'running')
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if activity.action:
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id_new = expr.execute(workitem.instance.res_type,
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workitem.instance.res_id, activity)
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if not id_new:
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with Transaction().set_user(0):
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self.delete(workitem.id)
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return False
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with Transaction().set_user(0):
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instance_id = instance_obj.search([
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('res_id', '=', id_new),
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('workflow', '=', activity.subflow.id),
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], limit=1)[0]
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else:
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instance_id = instance_obj.create({
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'res_type': workitem.instance.res_type,
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'res_id': workitem.instance.res_id,
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'workflow': activity.subflow.id,
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})
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self.write(workitem.id, {
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'subflow': instance_id,
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})
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#XXX must be changed with a cache reset on BrowseRecord
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workitem._data[workitem.id]['subflow'] = instance_id
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elif workitem.state == 'running':
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if workitem.subflow.state == 'complete':
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self._state_set(workitem, 'complete')
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return True
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def _split_test(self, workitem, split_mode, signal=None):
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instance_obj = self.pool.get('workflow.instance')
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test = False
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transitions = []
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if split_mode == 'XOR' or split_mode == 'OR':
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for transition in workitem.activity.out_transitions:
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if expr.check(workitem.instance.res_type,
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workitem.instance.res_id, transition, signal):
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test = True
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transitions.append(transition)
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if split_mode == 'XOR':
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break
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else:
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test = True
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for transition in workitem.activity.out_transitions:
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if not expr.check(workitem.instance.res_type,
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workitem.instance.res_id, transition, signal):
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test = False
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break
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if transition.id not in \
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[x.id for x in workitem.instance.transitions]:
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transitions.append(transition)
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if test and len(transitions):
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with Transaction().set_user(0):
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instance_obj.write(workitem.instance.id, {
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'transitions': [('add', [x.id for x in transitions])],
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})
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instance = workitem.instance
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self.delete(workitem.id)
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for transition in transitions:
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self._join_test(transition, instance)
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return True
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return False
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def _join_test(self, transition, instance):
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instance_obj = self.pool.get('workflow.instance')
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activity = transition.act_to
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if activity.join_mode == 'XOR':
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self.create({
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'activity': activity.id,
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'instance': instance.id,
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'state': 'active',
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})
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with Transaction().set_user(0):
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instance_obj.write(instance.id, {
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'transitions': [('unlink', transition.id)],
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})
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else:
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delete = True
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for transition in activity.in_transitions:
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if instance.id not in \
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[x.id for x in transition.instances]:
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delete = False
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break
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if delete:
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with Transaction().set_user(0):
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instance_obj.write(instance.id, {
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'transitions': [('unlink', [x.id
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for x in activity.in_transitions])],
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})
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self.create({
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'activity': activity.id,
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'instance': instance.id,
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'state': 'active',
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})
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WorkflowWorkitem()
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class WorkflowTrigger(ModelSQL, ModelView):
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"Workflow trigger"
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_table = "wkf_trigger"
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_name = "workflow.trigger"
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_description = __doc__
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res_id = fields.Integer('Resource ID')
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model = fields.Char('Model')
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instance = fields.Many2One('workflow.instance',
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'Destination Instance', ondelete="CASCADE")
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workitem = fields.Many2One('workflow.workitem', 'Workitem',
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required=True, ondelete="CASCADE")
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def __init__(self):
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super(WorkflowTrigger, self).__init__()
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for i in ('create', 'write', 'delete', 'copy'):
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del self._rpc[i]
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def init(self, module_name):
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super(WorkflowTrigger, self).init(module_name)
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table = TableHandler(Transaction().cursor, self, module_name)
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table.index_action(['res_id', 'model'], 'add')
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def fields_get(self, fields_names=None):
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res = super(WorkflowTrigger, self).fields_get(
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fields_names=fields_names)
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for field in res:
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res[field]['readonly'] = True
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return res
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WorkflowTrigger()
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class InstanceGraph(Report):
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_name = 'workflow.instance.graph'
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def execute(self, ids, datas):
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import pydot
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lang_obj = self.pool.get('ir.lang')
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workflow_obj = self.pool.get('workflow')
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instance_obj = self.pool.get('workflow.instance')
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lang_id = lang_obj.search([
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('code', '=', Transaction().language),
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], limit=1)[0]
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lang = lang_obj.browse(lang_id)
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workflow_id = workflow_obj.search([
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('model', '=', datas['model']),
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], limit=1)
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if not workflow_id:
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workflow_obj.raise_user_error('no_workflow_defined')
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workflow_id = workflow_id[0]
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workflow = workflow_obj.browse(workflow_id)
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instance_id = instance_obj.search([
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('res_id', '=', datas['id']),
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('workflow', '=', workflow.id),
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], order=[('id', 'DESC')], limit=1)
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if not instance_id:
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instance_obj.raise_user_error('no_instance_defined')
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instance_id = instance_id[0]
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title = "Workflow: %s" % (workflow.name.encode('ascii', 'replace'),)
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if pydot.__version__ == '1.0.2':
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# version 1.0.2 doesn't quote correctly label on Dot object
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title = '"' + title + '"'
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graph = pydot.Dot(fontsize='16',
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label=title)
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graph.set('center', '1')
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graph.set('ratio', 'auto')
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if lang.direction == 'ltr':
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if hasattr(graph, 'set_rankdir'):
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graph.set_rankdir('LR')
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else:
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graph.set('rankdir', 'LR')
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else:
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if hasattr(graph, 'set_rankdir'):
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graph.set_rankdir('RL')
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else:
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graph.set('rankdir', 'RL')
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self.graph_instance_get(graph, instance_id, datas.get('nested', False))
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data = graph.create(prog='dot', format='png')
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return ('png', base64.encodestring(data), False, workflow.name)
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def graph_instance_get(self, graph, instance_id, nested=False):
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instance_obj = self.pool.get('workflow.instance')
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instance = instance_obj.browse(instance_id)
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self.graph_get(graph, instance.workflow.id, nested,
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self.workitem_get(instance.id))
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def workitem_get(self, instance_id):
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res = {}
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workitem_obj = self.pool.get('workflow.workitem')
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workitem_ids = workitem_obj.search([
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('instance', '=', instance_id),
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])
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workitems = workitem_obj.browse(workitem_ids)
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for workitem in workitems:
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res.setdefault(workitem.activity.id, 0)
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res[workitem.activity.id] += 1
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if workitem.subflow:
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res.update(self.workitem_get(workitem.subflow.id))
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return res
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def graph_get(self, graph, workflow_id, nested=False, workitem=None):
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import pydot
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if workitem is None:
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workitem = {}
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activity_obj = self.pool.get('workflow.activity')
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workflow_obj = self.pool.get('workflow')
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transition_obj = self.pool.get('workflow.transition')
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activity_ids = activity_obj.search([
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('workflow', '=', workflow_id),
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])
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id2activities = {}
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actfrom = {}
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actto = {}
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activities = activity_obj.browse(activity_ids)
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start = 0
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stop = {}
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for activity in activities:
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if activity.flow_start:
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start = activity.id
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if activity.flow_stop:
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stop['subflow.' + activity.name] = activity.id
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id2activities[activity.id] = activity
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if activity.subflow and nested:
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workflow = workflow_obj.browse(activity.subflow.id)
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subgraph = pydot.Cluster('subflow' + str(workflow.id),
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fontsize='12',
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label="Subflow: " + activity.name.encode('ascii', 'replace'))
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(substart, substop) = self.graph_get(subgraph, workflow.id,
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nested, workitem)
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graph.add_subgraph(subgraph)
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actfrom[activity.id] = substart
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actto[activity.id] = substop
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else:
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args = {}
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args['label'] = activity.name.encode('ascii', 'replace')
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args['fontsize'] = '10'
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if activity.flow_start or activity.flow_stop:
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args['style'] = 'filled'
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args['color'] = 'lightgrey'
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if activity.subflow:
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args['shape'] = 'box'
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else:
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args['shape'] = 'octagon'
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if activity.id in workitem:
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args['label'] += '\\nx ' + str(workitem[activity.id])
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args['color'] = 'red'
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graph.add_node(pydot.Node(activity.id, **args))
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actfrom[activity.id] = (activity.id, {})
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actto[activity.id] = (activity.id, {})
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transition_ids = transition_obj.search([
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('act_from', 'in', [x.id for x in activities]),
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])
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transitions = transition_obj.browse(transition_ids)
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for transition in transitions:
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args = {}
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args['label'] = ' '
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if transition.condition != 'True':
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args['label'] += str(transition.condition).replace(' or ',
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'\\nor ').replace(' and ', '\\nand ')
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if transition.signal:
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args['label'] += '\\n' + str(transition.signal)
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args['style'] = 'bold'
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if id2activities[transition.act_from.id].split_mode == 'AND':
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args['arrowtail'] = 'box'
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elif id2activities[transition.act_from.id].split_mode == 'OR':
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args['arrowtail'] = 'inv'
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if id2activities[transition.act_to.id].join_mode == 'AND':
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args['arrowhead'] = 'crow'
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activity_from = actfrom[transition.act_from.id][1].get(
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transition.signal, actfrom[transition.act_from.id][0])
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activity_to = actto[transition.act_to.id][1].get(
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transition.signal, actto[transition.act_to.id][0])
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graph.add_edge(pydot.Edge(str(activity_from), str(activity_to),
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fontsize='10', **args))
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return ((start, {}), (stop.values()[0], stop))
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InstanceGraph()
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