Module: EcsDeploy::AutoScaler

Defined in:
lib/ecs_deploy/auto_scaler.rb

Defined Under Namespace

Modules: ConfigBase Classes: AutoScalingConfig, ServiceConfig, TriggerConfig

Constant Summary collapse

SERVICE_CONFIG_ATTRIBUTES = 
%i(name cluster region auto_scaling_group_name step max_task_count min_task_count idle_time scheduled_min_task_count cooldown_time_for_reach_max upscale_triggers downscale_triggers desired_count)

Class Attribute Summary collapse

Class Method Summary collapse

Class Attribute Details

.error_logger ⇒ Object (readonly)

Returns the value of attribute error_logger.



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# File 'lib/ecs_deploy/auto_scaler.rb', line 8

def error_logger
  @error_logger
end

.logger ⇒ Object (readonly)

Returns the value of attribute logger.



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# File 'lib/ecs_deploy/auto_scaler.rb', line 8

def logger
  @logger
end

Class Method Details

.auto_scaling_group_configs ⇒ Object 



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# File 'lib/ecs_deploy/auto_scaler.rb', line 94

def auto_scaling_group_configs
  @auto_scaling_group_configs ||= @config["auto_scaling_groups"].map(&AutoScalingConfig.method(:new))
end

.load_config(yaml_path) ⇒ Object 



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# File 'lib/ecs_deploy/auto_scaler.rb', line 85

def load_config(yaml_path)
  @config = YAML.load_file(yaml_path)
  @polling_interval = @config["polling_interval"] || 30
end

.main_loop(asg_config, configs) ⇒ Object 



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# File 'lib/ecs_deploy/auto_scaler.rb', line 32

def main_loop(asg_config, configs)
  loop_with_polling_interval("loop of #{asg_config.name}") do
    ths = configs.map do |service_config|
      Thread.new(service_config) do |s|
        next if s.idle?

        @logger.debug "Start service scaling of #{s.name}"

        difference = 0
        s.upscale_triggers.each do |trigger|
          step = trigger.step || s.step
          next if difference >= step

          if trigger.match?
            logger.info "Fire upscale trigger of #{s.name} by #{trigger.alarm_name} #{trigger.state}"
            difference = step
          end
        end

        if difference == 0 && s.desired_count > s.current_min_task_count
          s.downscale_triggers.each do |trigger|
            next unless trigger.match?

            logger.info "Fire downscale trigger of #{s.name} by #{trigger.alarm_name} #{trigger.state}"
            step = trigger.step || s.step
            difference = [difference, -step].min
          end
        end

        if s.current_min_task_count > s.desired_count + difference
          difference = s.current_min_task_count - s.desired_count
        end

        if difference >= 0 && s.desired_count > s.max_task_count.max
          difference = s.max_task_count.max - s.desired_count
        end

        if difference != 0
          s.update_service(difference)
        end
      end
    end

    ths.each(&:join)

    @logger.debug "Start asg scaling of #{asg_config.name}"

    total_service_count = configs.inject(0) { |sum, s| sum + s.desired_count }
    asg_config.update_auto_scaling_group(total_service_count, configs[0])
    asg_config.detach_and_terminate_orphan_instances(configs[0])
  end
end

.run(yaml_path, log_file = nil, error_log_file = nil) ⇒ Object 



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# File 'lib/ecs_deploy/auto_scaler.rb', line 10

def run(yaml_path, log_file = nil, error_log_file = nil)
  trap(:TERM) { @stop = true }
  trap(:INT) { @stop = true }
  @logger = Logger.new(log_file || STDOUT)
  @logger.level = Logger.const_get(ENV["ECS_AUTO_SCALER_LOG_LEVEL"].upcase) if ENV["ECS_AUTO_SCALER_LOG_LEVEL"]
  STDOUT.sync = true unless log_file
  @error_logger = Logger.new(error_log_file || STDERR)
  @error_logger.level = Logger.const_get(ENV["ECS_AUTO_SCALER_LOG_LEVEL"].upcase) if ENV["ECS_AUTO_SCALER_LOG_LEVEL"]
  STDERR.sync = true unless error_log_file
  load_config(yaml_path)
  service_configs
  auto_scaling_group_configs

  config_groups = service_configs.group_by { |s| [s.region, s.auto_scaling_group_name] }
  ths = config_groups.map do |(region, auto_scaling_group_name), configs|
    asg_config = auto_scaling_group_configs.find { |c| c.name == auto_scaling_group_name && c.region == region }
    Thread.new(asg_config, configs, &method(:main_loop))
  end

  ths.each(&:join)
end

.service_configs ⇒ Object 



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# File 'lib/ecs_deploy/auto_scaler.rb', line 90

def service_configs
  @service_configs ||= @config["services"].map(&ServiceConfig.method(:new))
end