Github user mxmrlv commented on a diff in the pull request:
https://github.com/apache/incubator-ariatosca/pull/72#discussion_r106802336
--- Diff: aria/modeling/orchestration.py ---
@@ -0,0 +1,350 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements. See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""
+classes:
+ * Execution - execution implementation model.
+ * Plugin - plugin implementation model.
+ * Task - a task
+"""
+
+# pylint: disable=no-self-argument, no-member, abstract-method
+
+from datetime import datetime
+
+from sqlalchemy import (
+ Column,
+ Integer,
+ Text,
+ DateTime,
+ Boolean,
+ Enum,
+ String,
+ Float,
+ orm,
+)
+from sqlalchemy.ext.associationproxy import association_proxy
+from sqlalchemy.ext.declarative import declared_attr
+
+from ..orchestrator.exceptions import (TaskAbortException,
TaskRetryException)
+from .types import (List, Dict)
+from .mixins import ModelMixin
+from . import relationships
+
+
+class ExecutionBase(ModelMixin):
+ """
+ Execution model representation.
+ """
+
+ __tablename__ = 'execution'
+
+ TERMINATED = 'terminated'
+ FAILED = 'failed'
+ CANCELLED = 'cancelled'
+ PENDING = 'pending'
+ STARTED = 'started'
+ CANCELLING = 'cancelling'
+ FORCE_CANCELLING = 'force_cancelling'
+
+ STATES = [TERMINATED, FAILED, CANCELLED, PENDING, STARTED, CANCELLING,
FORCE_CANCELLING]
+ END_STATES = [TERMINATED, FAILED, CANCELLED]
+ ACTIVE_STATES = [state for state in STATES if state not in END_STATES]
+
+ VALID_TRANSITIONS = {
+ PENDING: [STARTED, CANCELLED],
+ STARTED: END_STATES + [CANCELLING],
+ CANCELLING: END_STATES + [FORCE_CANCELLING]
+ }
+
+ @orm.validates('status')
+ def validate_status(self, key, value):
+ """Validation function that verifies execution status transitions
are OK"""
+ try:
+ current_status = getattr(self, key)
+ except AttributeError:
+ return
+ valid_transitions = self.VALID_TRANSITIONS.get(current_status, [])
+ if all([current_status is not None,
+ current_status != value,
+ value not in valid_transitions]):
+ raise ValueError('Cannot change execution status from
{current} to {new}'.format(
+ current=current_status,
+ new=value))
+ return value
+
+ created_at = Column(DateTime, index=True)
+ started_at = Column(DateTime, nullable=True, index=True)
+ ended_at = Column(DateTime, nullable=True, index=True)
+ error = Column(Text, nullable=True)
+ is_system_workflow = Column(Boolean, nullable=False, default=False)
+ parameters = Column(Dict)
+ status = Column(Enum(*STATES, name='execution_status'),
default=PENDING)
+ workflow_name = Column(Text)
+
+ @declared_attr
+ def service(cls):
+ return relationships.many_to_one(cls, 'service')
+
+ # region foreign keys
+
+ @declared_attr
+ def service_fk(cls):
+ return relationships.fk('service')
+
+ # endregion
+
+ # region association proxies
+
+ @declared_attr
+ def service_name(cls):
+ """Required for use by SQLAlchemy queries"""
+ return association_proxy('service', cls.name_column_name())
+
+ @declared_attr
+ def service_template(cls):
+ """Required for use by SQLAlchemy queries"""
+ return association_proxy('service', 'service_template')
+
+ @declared_attr
+ def service_template_name(cls):
+ """Required for use by SQLAlchemy queries"""
+ return association_proxy('service', 'service_template_name')
+
+ # endregion
+
+ def __str__(self):
+ return '<{0} id=`{1}` (status={2})>'.format(
+ self.__class__.__name__,
+ getattr(self, self.name_column_name()),
+ self.status
+ )
+
+ __private_fields__ = ['service_fk',
+ 'service_name',
+ 'service_template',
+ 'service_template_name']
+
+
+class PluginBase(ModelMixin):
+ """
+ Plugin model representation.
+ """
+
+ __tablename__ = 'plugin'
+
+ archive_name = Column(Text, nullable=False, index=True)
+ distribution = Column(Text)
+ distribution_release = Column(Text)
+ distribution_version = Column(Text)
+ package_name = Column(Text, nullable=False, index=True)
+ package_source = Column(Text)
+ package_version = Column(Text)
+ supported_platform = Column(Text)
+ supported_py_versions = Column(List)
+ uploaded_at = Column(DateTime, nullable=False, index=True)
+ wheels = Column(List, nullable=False)
+
+
+class TaskBase(ModelMixin):
+ """
+ A Model which represents an task
+ """
+
+ __tablename__ = 'task'
+
+ PENDING = 'pending'
+ RETRYING = 'retrying'
+ SENT = 'sent'
+ STARTED = 'started'
+ SUCCESS = 'success'
+ FAILED = 'failed'
+ STATES = (
+ PENDING,
+ RETRYING,
+ SENT,
+ STARTED,
+ SUCCESS,
+ FAILED,
+ )
+
+ WAIT_STATES = [PENDING, RETRYING]
+ END_STATES = [SUCCESS, FAILED]
+
+ RUNS_ON_SOURCE = 'source'
+ RUNS_ON_TARGET = 'target'
+ RUNS_ON_NODE = 'node'
+ RUNS_ON = (RUNS_ON_NODE, RUNS_ON_SOURCE, RUNS_ON_TARGET)
+
+ INFINITE_RETRIES = -1
+
+ @declared_attr
+ def node(cls):
+ return relationships.many_to_one(cls, 'node')
--- End diff --
nice :wink:
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