Class: Rollo::Commands::Hosts

Inherits:
Thor
  • Object
show all
Defined in:
lib/rollo/commands/hosts.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.exit_on_failure? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rollo/commands/hosts.rb', line 9

def self.exit_on_failure?
  true
end

Instance Method Details

#contract(region, asg_name, ecs_cluster_name, host_cluster = nil, service_cluster = nil) ⇒ Object 



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# File 'lib/rollo/commands/hosts.rb', line 65

def contract(
    region, asg_name, ecs_cluster_name,
        host_cluster = nil, service_cluster = nil)
  batch_size = options[:batch_size]

  host_cluster = host_cluster ||
      Rollo::Model::HostCluster.new(asg_name, region)
  service_cluster = service_cluster ||
      Rollo::Model::ServiceCluster.new(ecs_cluster_name, region)

  say("Decreasing host cluster desired capacity by #{batch_size}...")
  with_padding do
    host_cluster.decrease_capacity_by(batch_size) do |on|
      on.prepare do |current, target|
        say(
            "Changing desired capacity from #{current} to " +
                "#{target}...")
      end
      on.waiting_for_start do |attempt|
        say(
            "Waiting for capacity change to start " +
                "(attempt #{attempt})...")
      end
      on.waiting_for_end do |attempt|
        say(
            "Waiting for capacity change to complete " +
                "(attempt #{attempt})...")
      end
      on.waiting_for_health do |attempt|
        say(
            "Waiting for host cluster to reach healthy state " +
                "(attempt #{attempt})...")
      end
    end
    service_cluster.with_replica_services do |on|
      on.each_service do |service|
        service.wait_for_service_health do |on|
          on.waiting_for_health do |attempt|
            say(
                "Waiting for service #{service.name} to reach a " +
                    "steady state (attempt #{attempt})...")
          end
        end
      end
    end
  end
  say "Host cluster desired capacity decreased, continuing..."
end

#expand(region, asg_name, _, host_cluster = nil) ⇒ Object 



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# File 'lib/rollo/commands/hosts.rb', line 22

def expand(
    region, asg_name, _,
        host_cluster = nil)
  batch_size = options[:batch_size]

  host_cluster = host_cluster ||
      Rollo::Model::HostCluster.new(asg_name, region)

  say("Increasing host cluster desired capacity by #{batch_size}...")
  with_padding do
    host_cluster.increase_capacity_by(batch_size) do |on|
      on.prepare do |current, target|
        say(
            "Changing desired capacity from #{current} to " +
                "#{target}...")
      end
      on.waiting_for_start do |attempt|
        say(
            'Waiting for capacity change to start ' +
                "(attempt #{attempt})...")
      end
      on.waiting_for_end do |attempt|
        say(
            'Waiting for capacity change to complete ' +
                "(attempt #{attempt})...")
      end
      on.waiting_for_health do |attempt|
        say("Waiting for a healthy state (attempt #{attempt})")
      end
    end
  end
  say "Host cluster desired capacity increased, continuing..."
end

#terminate(region, asg_name, ecs_cluster_name, instance_ids, host_cluster = nil, service_cluster = nil) ⇒ Object 



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# File 'lib/rollo/commands/hosts.rb', line 129

def terminate(
    region, asg_name, ecs_cluster_name, instance_ids,
        host_cluster = nil, service_cluster = nil)
  batch_size = options[:batch_size]

  service_start_wait_minutes = options[:startup_time]
  service_start_wait_seconds = 60 * service_start_wait_minutes

  host_cluster = host_cluster ||
      Rollo::Model::HostCluster.new(asg_name, region)
  service_cluster = service_cluster ||
      Rollo::Model::ServiceCluster.new(ecs_cluster_name, region)

  hosts = host_cluster.hosts.select {|h| instance_ids.include?(h.id) }
  host_batches = hosts.each_slice(batch_size).to_a

  say(
      'Terminating old hosts in host cluster in batches of ' +
          "#{batch_size}...")
  with_padding do
    host_batches.each_with_index do |host_batch, index|
      say(
          "Batch #{index + 1} contains hosts: " +
              "\n\t\t[#{host_batch.map(&:id).join(",\n\t\t ")}]\n" +
              'Terminating...')
      host_batch.each(&:terminate)
      host_cluster.wait_for_capacity_health do |on|
        on.waiting_for_health do |attempt|
          say(
              'Waiting for host cluster to reach healthy state ' +
                  "(attempt #{attempt})")
        end
      end
      service_cluster.with_replica_services do |on|
        on.each_service do |service|
          service.wait_for_service_health do |on|
            on.waiting_for_health do |attempt|
              say(
                  "Waiting for service #{service.name} to reach a " +
                      "steady state (attempt #{attempt})...")
            end
          end
        end
      end
      say(
          "Waiting #{service_start_wait_minutes} minute(s) for " +
              'services to finish starting...')
      sleep(service_start_wait_seconds)
      say(
          "Waited #{service_start_wait_minutes} minute(s). " +
              'Continuing...')
    end
  end

end