125 lines
3.5 KiB
Python
125 lines
3.5 KiB
Python
# Copyright 2015 - Mirantis, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from oslo_serialization import jsonutils
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from stevedore import extension
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import yaql
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from mistral.db.v2 import api as db_api
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from mistral import utils
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ROOT_CONTEXT = None
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def get_yaql_context(data_context):
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global ROOT_CONTEXT
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if not ROOT_CONTEXT:
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ROOT_CONTEXT = yaql.create_context()
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_register_functions(ROOT_CONTEXT)
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new_ctx = ROOT_CONTEXT.create_child_context()
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new_ctx['$'] = data_context
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if isinstance(data_context, dict):
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new_ctx['__env'] = data_context.get('__env')
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new_ctx['__execution'] = data_context.get('__execution')
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new_ctx['__task_execution'] = data_context.get('__task_execution')
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return new_ctx
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def _register_custom_functions(yaql_ctx):
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"""Register custom YAQL functions
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Custom YAQL functions must be added as entry points in the
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'mistral.yaql_functions' namespace
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:param yaql_ctx: YAQL context object
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"""
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mgr = extension.ExtensionManager(
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namespace='mistral.yaql_functions',
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invoke_on_load=False
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)
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for name in mgr.names():
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yaql_function = mgr[name].plugin
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yaql_ctx.register_function(yaql_function, name=name)
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def _register_functions(yaql_ctx):
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_register_custom_functions(yaql_ctx)
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# Additional YAQL functions needed by Mistral.
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# If a function name ends with underscore then it doesn't need to pass
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# the name of the function when context registers it.
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def env_(context):
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return context['__env']
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def execution_(context):
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return context['__execution']
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def json_pp_(data):
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return jsonutils.dumps(
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data,
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indent=4
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).replace("\\n", "\n").replace(" \n", "\n")
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def task_(context, task_name):
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# Importing data_flow in order to break cycle dependency between modules.
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from mistral.workflow import data_flow
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# This section may not exist in a context if it's calculated not in
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# task scope.
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cur_task = context['__task_execution']
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if cur_task and cur_task['name'] == task_name:
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task_ex = db_api.get_task_execution(cur_task['id'])
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else:
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task_execs = db_api.get_task_executions(
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workflow_execution_id=context['__execution']['id'],
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name=task_name
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)
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# TODO(rakhmerov): Account for multiple executions (i.e. in case of
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# cycles).
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task_ex = task_execs[-1] if len(task_execs) > 0 else None
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if not task_ex:
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raise ValueError(
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'Failed to find task execution with name: %s' % task_name
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)
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# We don't use to_dict() db model method because not all fields
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# make sense for user.
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return {
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'id': task_ex.id,
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'name': task_ex.name,
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'spec': task_ex.spec,
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'state': task_ex.state,
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'state_info': task_ex.state_info,
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'result': data_flow.get_task_execution_result(task_ex),
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'published': task_ex.published
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}
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def uuid_(context):
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return utils.generate_unicode_uuid()
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