#!/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.

Ambari Agent

"""

from resource_management.core.resources import Execute
from resource_management.core.providers import Provider
from resource_management.libraries.functions.format import format
from resource_management.core.shell import as_sudo
from resource_management.core.system import System


class MonitorWebserverProvider(Provider):
  def action_start(self):
    self.get_serivice_params()
    self.enable_keep_alive()
    service_name = self.service_name
    Execute((format('/etc/init.d/{service_name}'), 'start'),
      sudo = True,        
    )

  def action_stop(self):
    self.get_serivice_params()
    service_name = self.service_name
    Execute((format('/etc/init.d/{service_name}'), 'stop'),
      sudo = True,        
    )

  def action_restart(self):
    self.action_stop()
    self.action_start()

  def get_serivice_params(self):
    self.system = System.get_instance()
    if self.system.os_family in ["suse","ubuntu"]:
      self.service_name = "apache2"
      self.httpd_conf_dir = '/etc/apache2'
    else:
      self.service_name = "httpd"
      self.httpd_conf_dir = '/etc/httpd/conf'

  # "tee --append /etc/apt/sources.list > /dev/null"
  def enable_keep_alive(self):
    httpd_conf_dir = self.httpd_conf_dir
    command = format("grep -E 'KeepAlive (On|Off)' {httpd_conf_dir}/httpd.conf && " + as_sudo(('sed',  '-i','s/KeepAlive Off/KeepAlive On/', format("{httpd_conf_dir}/httpd.conf"))) + " || echo 'KeepAlive On' | ") + as_sudo(('tee', '--append', format('{httpd_conf_dir}/httpd.conf'))) + " > /dev/null" 
    Execute(command
    )
