Class: RightScale::StatsManager

Inherits:
Object
  • Object
show all
Defined in:
lib/right_agent/scripts/stats_manager.rb

Constant Summary collapse

DEFAULT_TIMEOUT =

Default time to wait for a response from an agent

5

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ StatsManager

Initialize manager



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# File 'lib/right_agent/scripts/stats_manager.rb', line 54

def initialize
  @command_serializer = Serializer.new
end

Class Method Details

.run ⇒ Object

Create and run manager

Return

true

Always return true



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# File 'lib/right_agent/scripts/stats_manager.rb', line 48

def self.run
  m = StatsManager.new
  m.manage(m.parse_args)
end

Instance Method Details

#manage(options) ⇒ Object

Handle stats request

Parameters

options(Hash)

Command line options

Return

true

Always return true



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# File 'lib/right_agent/scripts/stats_manager.rb', line 65

def manage(options)
  init_log if options[:verbose]
  AgentConfig.cfg_dir = options[:cfg_dir]
  options[:timeout] ||= DEFAULT_TIMEOUT
  request_stats(options)
rescue Exception => e
  fail("#{e}\n#{e.backtrace.join("\n")}") unless e.is_a?(SystemExit)
end

#parse_args ⇒ Object

Create options hash from command line arguments

Return

options(Hash)

Parsed options



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# File 'lib/right_agent/scripts/stats_manager.rb', line 78

def parse_args
  options = {:reset => false}
  options[:agent_name] = ARGV[0] unless ARGV[0] =~ /^-/

  opts = OptionParser.new do |opts|
    parse_other_args(opts, options)

    opts.on('-r', '--reset') do
      options[:reset] = true
    end

    opts.on('-t', '--timeout SEC') do |sec|
      options[:timeout] = sec
    end

    opts.on('-j', '--json') do
      options[:json] = true
    end

    opts.on('-v', '--verbose') do
      options[:verbose] = true
    end

    opts.on("-c", "--cfg-dir DIR") do |d|
      options[:cfg_dir] = d
    end

    opts.on_tail('--help') do
      puts Usage.scan(__FILE__)
      exit
    end

  end

  begin
    opts.parse(ARGV)
  rescue Exception => e
    exit 0 if e.is_a?(SystemExit)
    fail(e.message + "\nUse 'rstat --help' for additional information")
  end

  options
end

#request_agent_stats(agent_name, options) ⇒ Object

Request and display statistics for agent

Parameters

agent_name(String)

Agent name

options(Hash)

Command line options

Return

(Boolean)

true if agent running, otherwise false



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# File 'lib/right_agent/scripts/stats_manager.rb', line 158

def request_agent_stats(agent_name, options)
  res = false
  config_options = AgentConfig.agent_options(agent_name)
  unless config_options.empty? || (listen_port = config_options[:listen_port]).nil?
    client = CommandClient.new(listen_port, config_options[:cookie])
    command = {:name => :stats, :reset => options[:reset]}
    begin
      client.send_command(command, options[:verbose], options[:timeout]) { |r| display(agent_name, r, options) }
      res = true
    rescue Exception => e
      msg = "Could not retrieve #{agent_name} agent stats: #{e}"
      msg += "\n" + e.backtrace.join("\n") unless e.message =~ /Timed out/
      fail(msg)
    end
  end
  res
end

#request_stats(options) ⇒ Object

Request and display statistics for agents

Parameters

options(Hash)

Command line options

Return

true

Always return true



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# File 'lib/right_agent/scripts/stats_manager.rb', line 129

def request_stats(options)
  # Determine candidate agents
  agent_names = if options[:agent_name]
    [options[:agent_name]]
  else
    AgentConfig.cfg_agents
  end
  fail("No agents configured") if agent_names.empty?

  # Request stats from agents
  count = 0
  agent_names.each do |agent_name|
    begin
      count += 1 if request_agent_stats(agent_name, options)
    rescue Exception => e
      $stderr.puts "Command to #{agent_name} agent failed (#{e})" unless e.is_a?(SystemExit)
    end
  end
  $stderr.puts("No agents running") if count == 0
end