457 lines
16 KiB
Python
457 lines
16 KiB
Python
# Copyright 2017 AT&T Intellectual Property. All other rights reserved.
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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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"""Access methods for managing external data access and persistence."""
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import logging
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from datetime import datetime
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from sqlalchemy import create_engine
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from sqlalchemy import sql
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from sqlalchemy import MetaData
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import drydock_provisioner.objects as objects
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import drydock_provisioner.objects.fields as hd_fields
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from .db import tables
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from .design import resolver
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from drydock_provisioner import config
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from drydock_provisioner.error import StateError
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class DrydockState(object):
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def __init__(self):
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self.logger = logging.getLogger(
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config.config_mgr.conf.logging.global_logger_name)
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self.resolver = resolver.DesignResolver()
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return
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def connect_db(self):
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"""Connect the state manager to the persistent DB."""
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self.db_engine = create_engine(
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config.config_mgr.conf.database.database_connect_string)
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self.db_metadata = MetaData(bind=self.db_engine)
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self.tasks_tbl = tables.Tasks(self.db_metadata)
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self.result_message_tbl = tables.ResultMessage(self.db_metadata)
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self.active_instance_tbl = tables.ActiveInstance(self.db_metadata)
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self.build_data_tbl = tables.BuildData(self.db_metadata)
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return
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def tabularasa(self):
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"""Truncate all tables.
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Used for testing to truncate all tables so the database is clean.
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"""
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table_names = [
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'tasks',
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'result_message',
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'active_instance',
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'build_data',
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]
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conn = self.db_engine.connect()
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for t in table_names:
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query_text = sql.text(
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"TRUNCATE TABLE %s" % t).execution_options(autocommit=True)
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conn.execute(query_text)
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conn.close()
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def get_design_documents(self, design_ref):
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return self.resolver.resolve_reference(design_ref)
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def get_tasks(self):
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"""Get all tasks in the database."""
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try:
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conn = self.db_engine.connect()
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query = sql.select([self.tasks_tbl])
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rs = conn.execute(query)
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task_list = [objects.Task.from_db(dict(r)) for r in rs]
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self._assemble_tasks(task_list=task_list)
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# add reference to this state manager to each task
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for t in task_list:
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t.statemgr = self
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conn.close()
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return task_list
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except Exception as ex:
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self.logger.error("Error querying task list: %s" % str(ex))
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return []
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def get_complete_subtasks(self, task_id):
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"""Query database for subtasks of the provided task that are complete.
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Complete is defined as status of Terminated or Complete.
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:param task_id: uuid.UUID ID of the parent task for subtasks
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"""
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try:
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conn = self.db_engine.connect()
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query_text = sql.text(
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"SELECT * FROM tasks WHERE " # nosec no strings are user-sourced
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"parent_task_id = :parent_task_id AND "
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"status IN ('" + hd_fields.TaskStatus.Terminated + "','" +
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hd_fields.TaskStatus.Complete + "')")
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rs = conn.execute(query_text, parent_task_id=task_id.bytes)
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task_list = [objects.Task.from_db(dict(r)) for r in rs]
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conn.close()
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self._assemble_tasks(task_list=task_list)
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for t in task_list:
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t.statemgr = self
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return task_list
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except Exception as ex:
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self.logger.error("Error querying complete subtask: %s" % str(ex))
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return []
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def get_active_subtasks(self, task_id):
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"""Query database for subtasks of the provided task that are active.
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Active is defined as status of not Terminated or Complete. Returns
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list of objects.Task instances
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:param task_id: uuid.UUID ID of the parent task for subtasks
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"""
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try:
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conn = self.db_engine.connect()
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query_text = sql.text(
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"SELECT * FROM tasks WHERE " # nosec no strings are user-sourced
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"parent_task_id = :parent_task_id AND "
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"status NOT IN ['" + hd_fields.TaskStatus.Terminated + "','" +
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hd_fields.TaskStatus.Complete + "']")
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rs = conn.execute(query_text, parent_task_id=task_id.bytes)
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task_list = [objects.Task.from_db(dict(r)) for r in rs]
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conn.close()
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self._assemble_tasks(task_list=task_list)
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for t in task_list:
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t.statemgr = self
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return task_list
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except Exception as ex:
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self.logger.error("Error querying active subtask: %s" % str(ex))
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return []
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def get_next_queued_task(self, allowed_actions=None):
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"""Query the database for the next (by creation timestamp) queued task.
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If specified, only select tasks for one of the actions in the allowed_actions
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list.
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:param allowed_actions: list of string action names
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"""
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try:
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conn = self.db_engine.connect()
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if allowed_actions is None:
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query = self.tasks_tbl.select().where(
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self.tasks_tbl.c.status ==
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hd_fields.TaskStatus.Queued).order_by(
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self.tasks_tbl.c.created.asc())
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rs = conn.execute(query)
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else:
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query = sql.text("SELECT * FROM tasks WHERE "
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"status = :queued_status AND "
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"action = ANY(:actions) "
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"ORDER BY created ASC")
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rs = conn.execute(
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query,
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queued_status=hd_fields.TaskStatus.Queued,
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actions=allowed_actions)
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r = rs.first()
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conn.close()
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if r is not None:
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task = objects.Task.from_db(dict(r))
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self._assemble_tasks(task_list=[task])
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task.statemgr = self
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return task
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else:
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return None
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except Exception as ex:
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self.logger.error(
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"Error querying for next queued task: %s" % str(ex),
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exc_info=True)
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return None
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def get_task(self, task_id):
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"""Query database for task matching task_id.
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:param task_id: uuid.UUID of a task_id to query against
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"""
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try:
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conn = self.db_engine.connect()
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query = self.tasks_tbl.select().where(
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self.tasks_tbl.c.task_id == task_id.bytes)
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rs = conn.execute(query)
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r = rs.fetchone()
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task = objects.Task.from_db(dict(r))
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self.logger.debug(
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"Assembling result messages for task %s." % str(task.task_id))
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self._assemble_tasks(task_list=[task])
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task.statemgr = self
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conn.close()
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return task
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except Exception as ex:
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self.logger.error(
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"Error querying task %s: %s" % (str(task_id), str(ex)),
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exc_info=True)
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return None
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def post_result_message(self, task_id, msg):
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"""Add a result message to database attached to task task_id.
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:param task_id: uuid.UUID ID of the task the msg belongs to
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:param msg: instance of objects.TaskStatusMessage
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"""
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try:
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conn = self.db_engine.connect()
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query = self.result_message_tbl.insert().values(
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task_id=task_id.bytes, **(msg.to_db()))
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conn.execute(query)
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conn.close()
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return True
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except Exception as ex:
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self.logger.error(
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"Error inserting result message for task %s: %s" %
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(str(task_id), str(ex)))
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return False
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def _assemble_tasks(self, task_list=None):
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"""Attach all the appropriate result messages to the tasks in the list.
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:param task_list: a list of objects.Task instances to attach result messages to
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"""
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if task_list is None:
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return None
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conn = self.db_engine.connect()
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query = sql.select([
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self.result_message_tbl
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]).where(self.result_message_tbl.c.task_id == sql.bindparam(
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'task_id')).order_by(self.result_message_tbl.c.sequence.asc())
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query.compile(self.db_engine)
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for t in task_list:
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rs = conn.execute(query, task_id=t.task_id.bytes)
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error_count = 0
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for r in rs:
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msg = objects.TaskStatusMessage.from_db(dict(r))
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if msg.error:
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error_count = error_count + 1
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t.result.message_list.append(msg)
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t.result.error_count = error_count
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conn.close()
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def post_task(self, task):
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"""Insert a task into the database.
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Does not insert attached result messages
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:param task: instance of objects.Task to insert into the database.
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"""
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try:
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conn = self.db_engine.connect()
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query = self.tasks_tbl.insert().values(
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**(task.to_db(include_id=True)))
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conn.execute(query)
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conn.close()
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return True
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except Exception as ex:
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self.logger.error("Error inserting task %s: %s" %
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(str(task.task_id), str(ex)))
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return False
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def put_task(self, task):
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"""Update a task in the database.
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:param task: objects.Task instance to reference for update values
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"""
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try:
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conn = self.db_engine.connect()
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query = self.tasks_tbl.update().where(
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self.tasks_tbl.c.task_id == task.task_id.bytes).values(
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**(task.to_db(include_id=False)))
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rs = conn.execute(query)
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if rs.rowcount == 1:
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conn.close()
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return True
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else:
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conn.close()
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return False
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except Exception as ex:
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self.logger.error("Error updating task %s: %s" %
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(str(task.task_id), str(ex)))
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return False
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def add_subtask(self, task_id, subtask_id):
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"""Add new task to subtask list.
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:param task_id: uuid.UUID parent task ID
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:param subtask_id: uuid.UUID new subtask ID
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"""
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query_string = sql.text(
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"UPDATE tasks "
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"SET subtask_id_list = array_append(subtask_id_list, :new_subtask) "
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"WHERE task_id = :task_id").execution_options(autocommit=True)
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try:
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conn = self.db_engine.connect()
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rs = conn.execute(
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query_string,
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new_subtask=subtask_id.bytes,
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task_id=task_id.bytes)
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rc = rs.rowcount
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conn.close()
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if rc == 1:
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return True
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else:
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return False
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except Exception as ex:
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self.logger.error("Error appending subtask %s to task %s: %s" %
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(str(subtask_id), str(task_id), str(ex)))
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return False
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def maintain_leadership(self, leader_id):
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"""The active leader reaffirms its existence.
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:param leader_id: uuid.UUID ID of the leader
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"""
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try:
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conn = self.db_engine.connect()
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query = self.active_instance_tbl.update().where(
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self.active_instance_tbl.c.identity == leader_id.bytes).values(
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last_ping=datetime.utcnow())
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rs = conn.execute(query)
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rc = rs.rowcount
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conn.close()
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if rc == 1:
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return True
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else:
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return False
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except Exception as ex:
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self.logger.error("Error maintaining leadership: %s" % str(ex))
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def claim_leadership(self, leader_id):
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"""Claim active instance status for leader_id.
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Attempt to claim leadership for leader_id. If another leader_id already has leadership
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and has checked-in within the configured interval, this claim fails. If the last check-in
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of an active instance is outside the configured interval, this claim will overwrite the
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current active instance and succeed. If leadership has not been claimed, this call will
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succeed.
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All leadership claims by an instance should use the same leader_id
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:param leader_id: a uuid.UUID instance identifying the instance to be considered active
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"""
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query_string = sql.text( # nosec no strings are user-sourced
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"INSERT INTO active_instance (dummy_key, identity, last_ping) "
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"VALUES (1, :instance_id, timezone('UTC', now())) "
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"ON CONFLICT (dummy_key) DO UPDATE SET "
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"identity = :instance_id "
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"WHERE active_instance.last_ping < (now() - interval '%d seconds')"
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% (config.config_mgr.conf.leader_grace_period
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)).execution_options(autocommit=True)
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try:
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conn = self.db_engine.connect()
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conn.execute(query_string, instance_id=leader_id.bytes)
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check_query = self.active_instance_tbl.select().where(
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self.active_instance_tbl.c.identity == leader_id.bytes)
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rs = conn.execute(check_query)
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r = rs.fetchone()
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conn.close()
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if r is not None:
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return True
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else:
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return False
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except Exception as ex:
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self.logger.error("Error executing leadership claim: %s" % str(ex))
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return False
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def abdicate_leadership(self, leader_id):
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"""Give up leadership for ``leader_id``.
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:param leader_id: a uuid.UUID instance identifying the instance giving up leadership
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"""
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try:
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conn = self.db_engine.connect()
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query = self.active_instance_tbl.delete().where(
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self.active_instance_tbl.c.identity == leader_id.bytes)
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rs = conn.execute(query)
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rc = rs.rowcount
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conn.close()
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if rc == 1:
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return True
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else:
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return False
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except Exception as ex:
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self.logger.error("Error abidcating leadership: %s" % str(ex))
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def post_promenade_part(self, part):
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my_lock = self.promenade_lock.acquire(blocking=True, timeout=10)
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if my_lock:
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if self.promenade.get(part.target, None) is not None:
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self.promenade[part.target].append(part.obj_to_primitive())
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else:
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self.promenade[part.target] = [part.obj_to_primitive()]
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self.promenade_lock.release()
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return None
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else:
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raise StateError("Could not acquire lock")
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def get_promenade_parts(self, target):
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parts = self.promenade.get(target, None)
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if parts is not None:
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return [
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objects.PromenadeConfig.obj_from_primitive(p) for p in parts
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]
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else:
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# Return an empty list just to play nice with extend
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return []
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def set_bootdata_key(self, hostname, design_id, data_key):
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my_lock = self.bootdata_lock.acquire(blocking=True, timeout=10)
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if my_lock:
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self.bootdata[hostname] = {'design_id': design_id, 'key': data_key}
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self.bootdata_lock.release()
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return None
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else:
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raise StateError("Could not acquire lock")
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def get_bootdata_key(self, hostname):
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return self.bootdata.get(hostname, None)
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