Class: Exec::ServiceStop

Inherits:
ExecutableCommand show all
Defined in:
lib/exec/service_stop.rb

Overview

Allows the user to stop host components.

Author:

  • tnoguer

Instance Attribute Summary

Attributes inherited from ExecutableCommand

#argv, #command_name, #logger, #options, #stderr, #stdin, #stdout, #values

Instance Method Summary collapse

Methods inherited from ExecutableCommand

#check_parameters, #create_logger, #initialize, #run

Constructor Details

This class inherits a constructor from Exec::ExecutableCommand

Instance Method Details

#exec ⇒ Object (private)

Execution of the command

Author:

  • tnoguer



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# File 'lib/exec/service_stop.rb', line 40

def exec

  begin
    Color::print_log("NONE", "Checking dependencies...", @stdout)
    Common::ServicesDescription.get_master_components_depends_on(@values["service"]).each do |dep_master_component|
      dep_service_name = Common::ServicesDescription.get_service_name_by_comp_name(dep_master_component)
      data = Command::AmbariServiceComponentInfo.new(dep_service_name, @values["cluster"], dep_master_component).exec

      stopped = true
      data["host_components"].each do |host_component|
        stopped = false if host_component["HostRoles"]["status"] != "STOPPED"
      end

      raise MissingDependency.new("Master component #{dep_master_component} has to be stopped before stop #{@values["service"]} service.") unless stopped
    end
    Color::echo_ok(@stdout)

  rescue CloudboxError => e
    Color::echo_fail(@stdout)
    raise e
  end

  msg = "Unknown combination of attributes... (should never happend)"
  cmd = nil

  if (!@values["host"].nil? && !@values["component"].nil?) || (!@values["service"].nil? && !@values["host"].nil? && !@values["component"].nil?)
    # 3
    # one component on one host
    msg = "Stop components #{@values["component"]} on host #{@values["host"]} (@cluster #{@values["cluster"]})."
    cmd = Command::AmbariStopHostComponent.new(@values["cluster"], @values["component"], @values["host"])

  elsif !@values["component"].nil? || (!@values["service"].nil? && !@values["component"].nil?)
    # 1
    # one component on all hosts
    msg = "Stop all components (@cluster #{@values["cluster"]})."
    cmd = Command::AmbariStopComponent.new(@values["cluster"], @values["component"])

  elsif !@values["service"].nil? && !@values["host"].nil?
    # 5
    # all component on one host for one service
    # @todo it is the same case than number 3
    msg = "Stop components #{@values["component"]} of service #{@values["service"]} on host #{@values["host"]} (@cluster #{@values["cluster"]})."
    cmd = Command::AmbariStopHostComponents.new(@values["cluster"], @values["service"], @values["host"])

  elsif !@values["host"].nil?
    # 2
    # all component on one host
    msg = "Stop all components on host #{@values["host"]} (@cluster #{@values["cluster"]})."
    cmd = Command::AmbariStopHost.new(@values["cluster"], @values["host"])

  elsif !@values["service"].nil?
    # 4
    # all component on all hosts for one service
    msg = "Stop all components #{@values["component"]} of service #{@values["service"]} on all hosts (@cluster #{@values["cluster"]})."
    cmd = Command::AmbariStopServiceComponents.new(@values["cluster"], @values["service"])

  elsif @values["service"].nil? && @values["host"].nil? && @values["component"].nil?
    # 6
    # all component on all host for all service
    msg = "Stop all components of all services on all hosts (@cluster #{@values["cluster"]})."
    cmd = Command::AmbariStopCluster.new(@values["cluster"])

  else
    raise StandardError(msg)
  end

  Color::print_log("NONE", msg, @stdout)
  cmd.exec()
  Color::echo_ok(@stdout)
end

#set_options ⇒ Object (private)

Parse and check the parameters of the function.

Author:

  • tmarmin



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# File 'lib/exec/service_stop.rb', line 28

def set_options
  @logger.info("setting options")
  @options.add_option("C", "cluster", "The virtual cluster name.", true, true, method(:check_cluster_name))
  @options.add_option("s", "service", "Limit request to this service.", false, true, method(:check_hadoop_service_name))
  @options.add_option("H", "host", "Limit request to this host.", false, true, method(:check_ambari_host_name))
  @options.add_option("c", "component", "Limit request to this component type.", false, true, method(:check_hadoop_component_name))
  @options.add_option("f", "follow", "Follow completion of the request.", false)
end