Class: EcsDeploy::AutoScaler::ServiceConfig

Inherits:
Struct
  • Object
show all
Includes:
ConfigBase
Defined in:
lib/ecs_deploy/auto_scaler.rb

Instance Method Summary collapse

Constructor Details

#initialize(attributes = {}) ⇒ ServiceConfig

Returns a new instance of ServiceConfig.



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# File 'lib/ecs_deploy/auto_scaler.rb', line 139

def initialize(attributes = {})
  super(attributes)
  self.idle_time ||= 60
  self.max_task_count = Array(max_task_count)
  self.upscale_triggers = upscale_triggers.to_a.map do |t|
    TriggerConfig.new(t.merge(region: region))
  end
  self.downscale_triggers = downscale_triggers.to_a.map do |t|
    TriggerConfig.new(t.merge(region: region))
  end
  self.max_task_count.sort!
  self.desired_count = fetch_service.desired_count
  @reach_max_at = nil
  @last_updated_at = nil
end

Instance Method Details

#client ⇒ Object 



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# File 'lib/ecs_deploy/auto_scaler.rb', line 155

def client
  Aws::ECS::Client.new(
    access_key_id: EcsDeploy.config.access_key_id,
    secret_access_key: EcsDeploy.config.secret_access_key,
    region: region
  )
end

#current_min_task_count ⇒ Object 



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# File 'lib/ecs_deploy/auto_scaler.rb', line 170

def current_min_task_count
  return min_task_count if scheduled_min_task_count.nil? || scheduled_min_task_count.empty?

  scheduled_min_task_count.find(-> { {"count" => min_task_count} }) { |s|
    from = Time.parse(s["from"])
    to = Time.parse(s["to"])
    (from..to).cover?(Time.now)
  }["count"]
end

#fetch_container_instances ⇒ Object 



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# File 'lib/ecs_deploy/auto_scaler.rb', line 240

def fetch_container_instances
  arns = []
  resp = nil
  cl = client
  loop do
    options = {cluster: cluster}
    options.merge(next_token: resp.next_token) if resp && resp.next_token
    resp = cl.list_container_instances(options)
    arns.concat(resp.container_instance_arns)
    break unless resp.next_token
  end

  chunk_size = 50
  container_instances = []
  arns.each_slice(chunk_size) do |arn_chunk|
    is = cl.describe_container_instances(cluster: cluster, container_instances: arn_chunk).container_instances
    container_instances.concat(is)
  end

  container_instances
end

#fetch_service ⇒ Object 



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# File 'lib/ecs_deploy/auto_scaler.rb', line 185

def fetch_service
  res = client.describe_services(cluster: cluster, services: [name])
  raise "Service \"#{name}\" is not found" if res.services.empty?
  res.services[0]
rescue => e
  AutoScaler.error_logger.error(e)
end

#idle? ⇒ Boolean

Returns:



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# File 'lib/ecs_deploy/auto_scaler.rb', line 163

def idle?
  return false unless @last_updated_at

  diff = Process.clock_gettime(Process::CLOCK_MONOTONIC, :second) - @last_updated_at
  diff < idle_time
end

#overheat? ⇒ Boolean

Returns:



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# File 'lib/ecs_deploy/auto_scaler.rb', line 180

def overheat?
  return false unless @reach_max_at
  (Process.clock_gettime(Process::CLOCK_MONOTONIC, :second) - @reach_max_at) > cooldown_time_for_reach_max
end

#update_service(difference) ⇒ Object 



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# File 'lib/ecs_deploy/auto_scaler.rb', line 193

def update_service(difference)
  next_desired_count = desired_count + difference
  current_level = max_task_level(desired_count)
  next_level = max_task_level(next_desired_count)
  if current_level < next_level && overheat? # next max
    level = next_level
    @reach_max_at = nil
    AutoScaler.logger.info "Service \"#{name}\" is overheat, uses next max count"
  elsif current_level < next_level && !overheat? # wait cooldown
    level = current_level
    now = Process.clock_gettime(Process::CLOCK_MONOTONIC, :second)
    @reach_max_at ||= now
    AutoScaler.logger.info "Service \"#{name}\" waits cooldown elapsed #{(now - @reach_max_at).to_i}sec"
  elsif current_level == next_level && next_desired_count >= max_task_count[current_level] # reach current max
    level = current_level
    now = Process.clock_gettime(Process::CLOCK_MONOTONIC, :second)
    @reach_max_at ||= now
    AutoScaler.logger.info "Service \"#{name}\" waits cooldown elapsed #{(now - @reach_max_at).to_i}sec"
  elsif current_level == next_level && next_desired_count < max_task_count[current_level]
    level = current_level
    @reach_max_at = nil
    AutoScaler.logger.info "Service \"#{name}\" clears cooldown state"
  elsif current_level > next_level
    level = next_level
    @reach_max_at = nil
    AutoScaler.logger.info "Service \"#{name}\" clears cooldown state"
  end

  cl = client
  next_desired_count = [next_desired_count, max_task_count[level]].min
  cl.update_service(
    cluster: cluster,
    service: name,
    desired_count: next_desired_count,
  )
  cl.wait_until(:services_stable, cluster: cluster, services: [name]) do |w|
    w.before_wait do
      AutoScaler.logger.debug "wait service stable [#{name}]"
    end
  end if difference < 0
  @last_updated_at = Process.clock_gettime(Process::CLOCK_MONOTONIC, :second)
  self.desired_count = next_desired_count
  AutoScaler.logger.info "Update service \"#{name}\": desired_count -> #{next_desired_count}"
rescue => e
  AutoScaler.error_logger.error(e)
end