bigtop-packages/src/common/bigtop-ambari-mpack/bgtp-ambari-mpack/src/main/resources/stacks/BGTP/1.0/services/HIVE/package/scripts/mysql_service.py

#!/usr/bin/env python
"""
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.

"""

import os
# Ambari Commons & Resource Management Imports
from resource_management.core.exceptions import ComponentIsNotRunning, Fail
from resource_management.core.resources.system import Execute
from resource_management.libraries.functions.format import format


def get_daemon_name():
  import status_params

  for service_file_template in status_params.SERVICE_FILE_TEMPLATES:
    for possible_daemon_name in status_params.POSSIBLE_DAEMON_NAMES:
      daemon_path = service_file_template.format(possible_daemon_name)
      if os.path.exists(daemon_path):
        return possible_daemon_name

  raise Fail("Could not find service daemon for mysql")

def mysql_service(action='start'):
  daemon_name = get_daemon_name()

  status_cmd = format("pgrep -l '^{process_name}$'")
  cmd = ('service', daemon_name, action)

  if action == 'status':
    try:
      Execute(status_cmd)
    except Fail:
      raise ComponentIsNotRunning()
  elif action == 'stop':
    import params
    Execute(cmd,
            logoutput = True,
            only_if = status_cmd,
            sudo = True,
    )
  elif action == 'start':
    import params   
    Execute(cmd,
      logoutput = True,
      not_if = status_cmd,
      sudo = True,
    )