Class: Bipbip::Agent

Inherits:
Object
  • Object
show all
Defined in:
lib/bipbip/agent.rb

Constant Summary collapse

PLUGIN_RESPAWN_DELAY = 
5

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(config_file = nil) ⇒ Agent

Returns a new instance of Agent.



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# File 'lib/bipbip/agent.rb', line 10

def initialize(config_file = nil)
  @plugins = []
  @storages = []

  load_config(config_file) if config_file
end

Instance Attribute Details

#plugins ⇒ Object

Returns the value of attribute plugins.



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# File 'lib/bipbip/agent.rb', line 7

def plugins
  @plugins
end

#storages ⇒ Object

Returns the value of attribute storages.



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# File 'lib/bipbip/agent.rb', line 8

def storages
  @storages
end

Instance Method Details

#interrupt ⇒ Object 



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# File 'lib/bipbip/agent.rb', line 92

def interrupt
  @interrupted = true

  Bipbip.logger.info 'Interrupt, killing plugin processes...'
  @plugins.each do |plugin|
    Process.kill('TERM', plugin.pid) if Process.exists?(plugin.pid)
  end

  Bipbip.logger.info 'Waiting for all plugin processes to exit...'
  Process.waitall
end

#load_config(config_file) ⇒ Object 



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# File 'lib/bipbip/agent.rb', line 54

def load_config(config_file)
  config = YAML.load(File.open(config_file))
  config = {
      'logfile' => STDOUT,
      'loglevel' => 'INFO',
      'frequency' => 60,
      'include' => nil,
      'services' => [],
      'services' => [],
  }.merge(config)

  Bipbip.logger = Logger.new(config['logfile'])
  Bipbip.logger.level = Logger::const_get(config['loglevel'])

  services = config['services'].to_a
  if config['include']
    include_path = File.expand_path(config['include'].to_s, File.dirname(config_file))

    files = Dir[include_path + '/**/*.yaml', include_path + '/**/*.yml']
    services += files.map { |file| YAML.load(File.open(file)) }
  end

  @plugins = services.map do |service|
    plugin_name = service['plugin']
    metric_group = service['metric_group']
    frequency = service['frequency'].nil? ? config['frequency'] : service['frequency']
    plugin_config = service.reject { |key, value| ['plugin', 'frequency', 'metric_group'].include?(key) }
    Bipbip::Plugin.factory(plugin_name, plugin_config, frequency, metric_group)
  end

  storages = config['storages'].to_a
  @storages = storages.map do |storage|
    storage_name = storage['name'].to_s
    storage_config = storage.reject { |key, value| ['name'].include?(key) }
    Bipbip::Storage.factory(storage_name, storage_config)
  end
end

#run ⇒ Object 



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# File 'lib/bipbip/agent.rb', line 17

def run
  Bipbip.logger.info 'Startup...'
  Bipbip.logger.warn 'No storages configured' if @storages.empty?

  if @plugins.empty?
    raise 'No services configured'
  end

  @storages.each do |storage|
    @plugins.each do |plugin|
      Bipbip.logger.info "Setting up plugin #{plugin.name} for storage #{storage.name}"
      storage.setup_plugin(plugin)
    end
  end

  ['INT', 'TERM'].each { |sig| trap(sig) {
    Thread.new do
      interrupt
      exit
    end
  } }

  @plugins.each do |plugin|
    Bipbip.logger.info "Starting plugin #{plugin.name} with config #{plugin.config}"
    plugin.run(@storages)
  end

  @interrupted = false
  until @interrupted
    pid = Process.wait(-1)
    plugin = plugin_by_pid(pid)
    Bipbip.logger.error "Plugin #{plugin.name} with config #{plugin.config} died. Respawning..."
    sleep(PLUGIN_RESPAWN_DELAY)
    plugin.run(@storages)
  end
end