Class: EcsDeploy::AutoScaler::ClusterResourceManager

Inherits:
Object
  • Object
show all
Defined in:
lib/ecs_deploy/auto_scaler/cluster_resource_manager.rb

Defined Under Namespace

Classes: DeregisterContainerInstanceFailed

Constant Summary collapse

MAX_DESCRIBABLE_SERVICE_COUNT = 
10

Instance Method Summary collapse

Constructor Details

#initialize(region:, cluster:, service_configs:, logger: nil, capacity_based_on:) ⇒ ClusterResourceManager

Returns a new instance of ClusterResourceManager.



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# File 'lib/ecs_deploy/auto_scaler/cluster_resource_manager.rb', line 12

def initialize(region:, cluster:, service_configs:, logger: nil, capacity_based_on:)
  @region = region
  @cluster = cluster
  @logger = logger
  @service_configs = service_configs
  @capacity_based_on = capacity_based_on
  if @capacity_based_on != "instances" && @capacity_based_on != "vCPUs"
    raise ArgumentError, 'capacity_based_on should be either "instances" or "vCPUs"'
  end

  @mutex = Mutex.new
  @resource = ConditionVariable.new
  @used_capacity = @service_configs.sum { |s| s.desired_count * s.required_capacity }
  @capacity = calculate_active_instance_capacity
end

Instance Method Details

#acquire(capacity, timeout: nil) ⇒ Object 



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# File 'lib/ecs_deploy/auto_scaler/cluster_resource_manager.rb', line 28

def acquire(capacity, timeout: nil)
  @mutex.synchronize do
    @logger&.debug("#{log_prefix} Trying to acquire #{capacity} capacity (capacity: #{@capacity}, used_capacity: #{@used_capacity})")
    Timeout.timeout(timeout) do
      while @capacity - @used_capacity < capacity
        @resource.wait(@mutex)
      end
    end
    @used_capacity += capacity
    @logger&.debug("#{log_prefix} Acquired #{capacity} capacity (capacity: #{@capacity}, used_capacity: #{@used_capacity})")
  end
  true
rescue Timeout::Error
  false
end

#calculate_active_instance_capacity ⇒ Object 



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# File 'lib/ecs_deploy/auto_scaler/cluster_resource_manager.rb', line 116

def calculate_active_instance_capacity
  cl = ecs_client

  if @capacity_based_on == "instances"
    return cl.list_container_instances(cluster: @cluster, status: "ACTIVE").sum do |resp|
      resp.container_instance_arns.size
    end
  end

  total_cpu = cl.list_container_instances(cluster: @cluster, status: "ACTIVE").sum do |resp|
    next 0 if resp.container_instance_arns.empty?
    ecs_client.describe_container_instances(
      cluster: @cluster,
      container_instances: resp.container_instance_arns,
    ).container_instances.sum { |ci| ci.registered_resources.find { |r| r.name == "CPU" }.integer_value }
  end

  total_cpu / 1024
end

#deregister_container_instance(container_instance_arn) ⇒ Object 



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# File 'lib/ecs_deploy/auto_scaler/cluster_resource_manager.rb', line 70

def deregister_container_instance(container_instance_arn)
  ecs_client.deregister_container_instance(cluster: @cluster, container_instance: container_instance_arn, force: true)
rescue Aws::ECS::Errors::InvalidParameterException
  raise DeregisterContainerInstanceFailed
end

#fetch_container_instance_arns_in_service ⇒ Object 



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# File 'lib/ecs_deploy/auto_scaler/cluster_resource_manager.rb', line 65

def fetch_container_instance_arns_in_service
  task_groups = @service_configs.map { |s| "service:#{s.name}" }
  ecs_client.list_container_instances(cluster: @cluster, filter: "task:group in [#{task_groups.join(",")}]").flat_map(&:container_instance_arns)
end

#fetch_container_instances_in_cluster ⇒ Object 



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# File 'lib/ecs_deploy/auto_scaler/cluster_resource_manager.rb', line 53

def fetch_container_instances_in_cluster
  cl = ecs_client
  resp = cl.list_container_instances(cluster: @cluster)
  if resp.container_instance_arns.empty?
    []
  else
    resp.flat_map do |resp|
      cl.describe_container_instances(cluster: @cluster, container_instances: resp.container_instance_arns).container_instances
    end
  end
end

#release(capacity) ⇒ Object 



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# File 'lib/ecs_deploy/auto_scaler/cluster_resource_manager.rb', line 44

def release(capacity)
  @mutex.synchronize do
    @used_capacity -= capacity
    @resource.broadcast
  end
  @logger&.debug("#{log_prefix} Released #{capacity} capacity (capacity: #{@capacity}, used_capacity: #{@used_capacity})")
  true
end

#trigger_capacity_update(old_desired_capacity, new_desired_capacity, interval: 5, wait_until_capacity_updated: false) ⇒ Object 



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# File 'lib/ecs_deploy/auto_scaler/cluster_resource_manager.rb', line 76

def trigger_capacity_update(old_desired_capacity, new_desired_capacity, interval: 5, wait_until_capacity_updated: false)
  return if new_desired_capacity == old_desired_capacity

  th = Thread.new do
    @logger&.info "#{log_prefix} Updating capacity: #{old_desired_capacity} -> #{new_desired_capacity}"
    Timeout.timeout(180) do
      until @capacity == new_desired_capacity ||
          (new_desired_capacity > old_desired_capacity && @capacity > new_desired_capacity) ||
          (new_desired_capacity < old_desired_capacity && @capacity < new_desired_capacity)
        @mutex.synchronize do
          @capacity = calculate_active_instance_capacity
          @resource.broadcast
        rescue => e
          AutoScaler.error_logger.warn("#{log_prefix} `#{__method__}': #{e} (#{e.class})")
        end

        sleep interval
      end
      @logger&.info "#{log_prefix} updated capacity to #{@capacity}"
    end
  rescue Timeout::Error => e
    msg = "#{log_prefix} `#{__method__}': #{e} (#{e.class})"
    if @capacity_based_on == "vCPUs"
      # Timeout::Error sometimes occur.
      # For example, the following case never meats the condition of until
      #   * old_desired_capaacity is 102
      #   * new_desired_capaacity is 101
      #   * all instances have 2 vCPUs
      AutoScaler.error_logger.warn(msg)
    else
      AutoScaler.error_logger.error(msg)
    end
  end

  if wait_until_capacity_updated
    @logger&.info "#{log_prefix} Waiting for the number of active instances to reach #{new_desired_capacity} (from #{old_desired_capacity})"
    th.join
  end
end