Class: CfnManage::StartStopHandler::EcsCluster

Inherits:
Object
  • Object
show all
Defined in:
lib/cfn_manage/handlers/ecs_cluster.rb

Instance Method Summary collapse

Constructor Details

#initialize(cluster_id, options = {}) ⇒ EcsCluster

Returns a new instance of EcsCluster.



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# File 'lib/cfn_manage/handlers/ecs_cluster.rb', line 8

def initialize(cluster_id, options = {})
  @wait_state = options.has_key?(:wait_state) ? options[:wait_state] : CfnManage.ecs_wait_state
  @skip_wait = options.has_key?(:skip_wait) ? CfnManage.true?(options[:skip_wait]) : CfnManage.skip_wait? 
  @wait_container_instances = options.has_key?(:wait_container_instances) ? CfnManage.true?(options[:wait_container_instances]) : CfnManage.ecs_wait_container_instances? 
  @ignore_missing_ecs_config = options.has_key?(:ignore_missing_ecs_config) ? CfnManage.true?(options[:ignore_missing_ecs_config]) : CfnManage.ignore_missing_ecs_config?
  
  credentials = CfnManage::AWSCredentials.get_session_credentials("stoprun_#{cluster_id}")
  @ecs_client = Aws::ECS::Client.new(credentials: credentials, retry_limit: 20)
  @elb_client = Aws::ElasticLoadBalancingV2::Client.new(credentials: credentials, retry_limit: 20)
  @services = []
  @ecs_client.list_services(cluster: cluster_id, scheduling_strategy: 'REPLICA', max_results: 100).each do |results|
    @services.push(*results.service_arns)
  end
  $log.info("Found #{@services.count} services in ECS cluster #{cluster_id}")
  @cluster = cluster_id
end

Instance Method Details

#start(configuration) ⇒ Object 



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# File 'lib/cfn_manage/handlers/ecs_cluster.rb', line 25

def start(configuration)
  if @wait_container_instances
    wait_for_instances()
  end
  
  @services.each do |service_arn|

    $log.info("Searching for ECS service #{service_arn} in cluster #{@cluster}")
    service = @ecs_client.describe_services(services:[service_arn], cluster: @cluster).services.first

    if service.desired_count != 0
      $log.info("ECS service #{service.service_name} is already running")
      next
    end

    if configuration.has_key?(service.service_name)
      desired_count = configuration[service.service_name].has_key?('desired_count') ? configuration[service.service_name]['desired_count'] : 0
      if desired_count == 0
        $log.info("Desired count is #{desired_count}, skipping starting of service #{service.service_name}")
        next
      end
    elsif CfnManage.ignore_missing_ecs_config?
      $log.info("ECS service #{service.service_name} wasn't previously stopped by cfn_manage. Option --ignore-missing-ecs-config set and setting desired count to 1")
      desired_count = 1
    else
      $log.warn("ECS service #{service.service_name} wasn't previously stopped by cfn_manage. Skipping ...")
      next
    end

    $log.info("Starting ECS service #{service.service_name} with desired count of #{desired_count}")
    @ecs_client.update_service({
      desired_count: desired_count,
      service: service_arn,
      cluster: @cluster
    })

  end

  if !@skip_wait
    @services.each do |service_arn|
      wait(@wait_state,service_arn)
    end
  end
  
end

#stop ⇒ Object 



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# File 'lib/cfn_manage/handlers/ecs_cluster.rb', line 71

def stop
  configuration = {}
  @services.each do |service_arn|

    $log.info("Searching for ECS service #{service_arn} in cluster #{@cluster}")
    service = @ecs_client.describe_services(services:[service_arn], cluster: @cluster).services.first

    if service.desired_count == 0
      $log.info("ECS service #{service.service_name} is already stopped")
      next
    end

    configuration[service.service_name] = { desired_count: service.desired_count }
    $log.info("Stopping ECS service #{service.service_name}")
    @ecs_client.update_service({
      desired_count: 0,
      service: service_arn,
      cluster: @cluster
    })

  end

  return configuration.empty? ? nil : configuration
end

#wait(type, service_arn = nil) ⇒ Object 



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# File 'lib/cfn_manage/handlers/ecs_cluster.rb', line 96

def wait(type,service_arn=nil)
  
  if service_arn.nil?
    $log.warn("Unable to wait for #{service_arn} service")
    return
  end
  
  attempts = 0
  
  until attempts == (max_attempts = 60*6) do
    
    case type
    when 'Running'
      success = wait_till_running(service_arn)
    when 'HealthyInTargetGroup'
      success = wait_till_healthy_in_target_group(service_arn)
    when 'Skip'
      $log.info("Skipping wait for #{service_arn} service")
      break
    else
      $log.warn("Unknown ECS service wait type #{type}. Skipping...")
      break
    end
    
    if success
      break
    end
    
    attempts = attempts + 1
    sleep(15)
  end

  if attempts == max_attempts
    $log.error("Failed to wait for ecs service with wait type #{type}")
  end
end

#wait_for_instances ⇒ Object 



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# File 'lib/cfn_manage/handlers/ecs_cluster.rb', line 133

def wait_for_instances
  
  attempts = 0
  
  until attempts == (max_attempts = 60*3) do
    
    resp = @ecs_client.list_container_instances({
      cluster: @cluster,
      status: "ACTIVE"
    })
    
    if resp.container_instance_arns.any?
      $log.info("A container instances has joined ecs cluster #{@cluster}")
      break
    end
    
    attempts = attempts + 1
    sleep(5)
  end

  if attempts == max_attempts
    $log.error("Failed to wait for container instances to join ecs cluster #{@cluster}")
  end
end

#wait_till_healthy_in_target_group(service_arn) ⇒ Object 



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# File 'lib/cfn_manage/handlers/ecs_cluster.rb', line 171

def wait_till_healthy_in_target_group(service_arn)
  service = @ecs_client.describe_services(services:[service_arn], cluster: @cluster).services.first
  target_groups = service.load_balancers.collect { |lb| lb.target_group_arn }
  
  if target_groups.empty?
    # we want to skip here if the asg is not associated with any target groups
    $log.info("ecs aervice #{service_arn} is not associated with any target groups")
    return true
  end
  
  target_health = []
  target_groups.each do |tg| 
    resp = @elb_client.describe_target_health({
      target_group_arn: tg, 
    })
    if resp.target_health_descriptions.empty?
      # we need to wait until a ecs task has been placed into the target group
      # before we can check it's healthy
      $log.info("ECS service #{service_arn} hasn't been placed into target group #{tg.split('/')[1]} yet")
      return false
    end
    target_health.push(*resp.target_health_descriptions)
  end
        
  state = target_health.collect {|tg| tg.target_health.state}
          
  if state.all? 'healthy'
    $log.info("All ecs tasks are in a healthy state in target groups #{target_groups.map {|tg| tg.split('/')[1] }}")
    return true
  end
  
  unhealthy = target_health.select {|tg| tg.target_health.state != 'healthy'}
  unhealthy.each do |tg|
    $log.info("waiting for ecs task #{tg.target.id} to be healthy in target group. Current state is #{tg.target_health.state}")
  end
  
  return false
end

#wait_till_running(service_arn) ⇒ Object 



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# File 'lib/cfn_manage/handlers/ecs_cluster.rb', line 158

def wait_till_running(service_arn)
  service_name = service_arn.split('/').last
  service = @ecs_client.describe_services(services:[service_arn], cluster: @cluster).services.first
          
  if service.running_count > 0
    $log.info("ecs service #{service_name} has #{service.running_count} running tasks")
    return true
  end  
  
  $log.info("waiting for ecs service #{service_name} to reach a running state")
  return false
end