Class: EcsDeploy::AutoScaler::AutoScalingGroupConfig

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

Constant Summary collapse

MAX_DETACHABLE_INSTANCE_COUNT = 
20

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from ConfigBase

#logger

Constructor Details

#initialize(attributes = {}, logger) ⇒ AutoScalingGroupConfig

Returns a new instance of AutoScalingGroupConfig.



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# File 'lib/ecs_deploy/auto_scaler/auto_scaling_group_config.rb', line 15

def initialize(attributes = {}, logger)
  attributes = attributes.dup
  services = attributes.delete("services")
  super(attributes, logger)
  self.service_configs = services.map do |s|
    ServiceConfig.new(s.merge("cluster" => cluster, "region" => region), logger)
  end
end

Instance Attribute Details

#buffer ⇒ Object

Returns the value of attribute buffer

Returns:

  • (Object) —

    the current value of buffer



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

def buffer
  @buffer
end

#cluster ⇒ Object

Returns the value of attribute cluster

Returns:

  • (Object) —

    the current value of cluster



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

def cluster
  @cluster
end

#disable_draining ⇒ Object

Returns the value of attribute disable_draining

Returns:

  • (Object) —

    the current value of disable_draining



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

def disable_draining
  @disable_draining
end

#name ⇒ Object

Returns the value of attribute name

Returns:

  • (Object) —

    the current value of name



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

def name
  @name
end

#region ⇒ Object

Returns the value of attribute region

Returns:

  • (Object) —

    the current value of region



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

def region
  @region
end

#service_configs ⇒ Object

Returns the value of attribute service_configs

Returns:

  • (Object) —

    the current value of service_configs



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

def service_configs
  @service_configs
end

Instance Method Details

#cluster_resource_manager ⇒ Object 



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# File 'lib/ecs_deploy/auto_scaler/auto_scaling_group_config.rb', line 56

def cluster_resource_manager
  @cluster_resource_manager ||= EcsDeploy::AutoScaler::ClusterResourceManager.new(
    region: region,
    cluster: cluster,
    service_configs: service_configs,
    capacity_based_on: "instances",
    logger: @logger,
  )
end

#detach_instances(instance_ids:, should_decrement_desired_capacity:) ⇒ Object 



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# File 'lib/ecs_deploy/auto_scaler/auto_scaling_group_config.rb', line 66

def detach_instances(instance_ids:, should_decrement_desired_capacity:)
  return if instance_ids.empty?

  instance_ids.each_slice(MAX_DETACHABLE_INSTANCE_COUNT) do |ids|
    client.detach_instances(
      auto_scaling_group_name: name,
      instance_ids: ids,
      should_decrement_desired_capacity: should_decrement_desired_capacity,
    )
  end

  @logger.info "#{log_prefix} Detached instances from ASG: #{instance_ids.inspect}"
end

#update_desired_capacity(required_capacity) ⇒ Object 



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# File 'lib/ecs_deploy/auto_scaler/auto_scaling_group_config.rb', line 24

def update_desired_capacity(required_capacity)
  detach_and_terminate_orphan_instances

  desired_capacity = (required_capacity + buffer.to_f).ceil

  current_asg = client.describe_auto_scaling_groups({
    auto_scaling_group_names: [name],
  }).auto_scaling_groups[0]

  if current_asg.desired_capacity > desired_capacity
    decreased_capacity = decrease_desired_capacity(current_asg.desired_capacity - desired_capacity)
    if decreased_capacity > 0
      new_desired_capacity = current_asg.desired_capacity - decreased_capacity
      cluster_resource_manager.trigger_capacity_update(current_asg.desired_capacity, new_desired_capacity)
      @logger.info "#{log_prefix} Updated desired_capacity to #{new_desired_capacity}"
    else
      @logger.info "#{log_prefix} Tried to Update desired_capacity but there were no deregisterable instances"
    end
  elsif current_asg.desired_capacity < desired_capacity
    client.update_auto_scaling_group(
      auto_scaling_group_name: name,
      min_size: 0,
      max_size: [current_asg.max_size, desired_capacity].max,
      desired_capacity: desired_capacity,
    )
    cluster_resource_manager.trigger_capacity_update(current_asg.desired_capacity, desired_capacity)
    @logger.info "#{log_prefix} Updated desired_capacity to #{desired_capacity}"
  end
rescue => e
  AutoScaler.error_logger.error(e)
end