Class: ChefWorkflow::VM::EC2Provisioner

Inherits:
Object
  • Object
show all
Includes:
DebugSupport
Defined in:
lib/chef-workflow/support/vm/ec2.rb

Constant Summary

Constants included from DebugSupport

DebugSupport::CHEF_WORKFLOW_DEBUG_DEFAULT

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from DebugSupport

#if_debug

Constructor Details

#initialize(name, number_of_servers) ⇒ EC2Provisioner 



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# File 'lib/chef-workflow/support/vm/ec2.rb', line 10

def initialize(name, number_of_servers)
  require 'chef-workflow/support/ec2'
  require 'chef-workflow/support/ip'
  require 'net/ssh'
  require 'timeout'

  @name = name
  @number_of_servers = number_of_servers
  init_instance_ids
end

Instance Attribute Details

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/chef-workflow/support/vm/ec2.rb', line 8

def name
  @name
end

Instance Method Details

#ec2 ⇒ Object 



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# File 'lib/chef-workflow/support/vm/ec2.rb', line 42

def ec2
  ChefWorkflow::EC2Support
end

#init_instance_ids ⇒ Object 



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# File 'lib/chef-workflow/support/vm/ec2.rb', line 21

def init_instance_ids
  @instance_ids = ChefWorkflow::DatabaseSupport::Set.new("vm_ec2_instances", name)
end

#report ⇒ Object 



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# File 'lib/chef-workflow/support/vm/ec2.rb', line 169

def report
  init_instance_ids
  ["#{@number_of_servers} servers; instance ids: #{@instance_ids.to_a.join(" ")}"]
end

#shutdown ⇒ Object 



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# File 'lib/chef-workflow/support/vm/ec2.rb', line 156

def shutdown
  aws_ec2 = ec2.ec2_obj

  @instance_ids.each do |instance_id|
    aws_ec2.instances[instance_id].terminate
  end

  @instance_ids.clear

  ChefWorkflow::IPSupport.delete_role(name)
  return true
end

#ssh_connection_check(ip) ⇒ Object 



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# File 'lib/chef-workflow/support/vm/ec2.rb', line 25

def ssh_connection_check(ip)
  Net::SSH.start(ip, ChefWorkflow::KnifeSupport.ssh_user, { :keys => [ChefWorkflow::KnifeSupport.ssh_identity_file] }) do |ssh|
    ssh.open_channel do |ch|
      ch.on_open_failed do
        return false
      end

      ch.exec("exit 0") do
        return true
      end
    end
    ssh.loop
  end
rescue Exception => e
  return false
end

#startup(*args) ⇒ Object 



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# File 'lib/chef-workflow/support/vm/ec2.rb', line 46

def startup(*args)
  aws_ec2 = ec2.ec2_obj

  ec2.assert_security_groups

  instances = aws_ec2.instances.create(
    :count            => @number_of_servers,
    :image_id         => ec2.ami,
    :security_groups  => ec2.security_groups,
    :key_name         => ec2.ssh_key,
    :instance_type    => ec2.instance_type
  )

  #
  # instances isn't actually an array above -- see this url:
  #
  # https://github.com/aws/aws-sdk-ruby/issues/100
  #
  # Actually make it a real array here so it's useful.
  #

  if instances.kind_of?(Array)
    new_instances = []

    instances.each do |instance|
      new_instances.push(instance)
    end

    instances = new_instances
  else
    instances = [instances]
  end

  #
  # There are instances where AWS won't acknowledge a created instance
  # right away. Let's make sure the API server knows they all exist before
  # moving forward.
  #

  unresolved_instances = instances.dup

  until unresolved_instances.empty?
    instance = unresolved_instances.shift

    unless (instance.status rescue nil)
      if_debug(3) do
        $stderr.puts "API server doesn't think #{instance.id} exists yet."
      end

      sleep 0.3
      unresolved_instances.push(instance)
    end
  end

  ip_addresses = []

  instances.each do |instance|
    @instance_ids.add(instance.id)
  end

  ipaddress_mutex = Mutex.new
  debug_mutex = Mutex.new

  begin
    Timeout.timeout(ec2.provision_wait) do
      instances.map do |instance|
        Thread.new do
          loop do
            ready = false

            if instance.status == :running
              ready = ssh_connection_check(instance.ip_address)
              unless ready
                if_debug(3) do
                  debug_mutex.synchronize do
                    $stderr.puts "Instance #{instance.id} running, but ssh isn't up yet."
                  end
                end
              end
            else
              if_debug(3) do
                debug_mutex.synchronize do
                  $stderr.puts "#{instance.id} isn't running yet -- scheduling for re-check"
                end
              end
            end

            if ready
              ipaddress_mutex.synchronize do
                ip_addresses.push(instance.ip_address)
              end
              break
            end

            sleep 2
          end
        end
      end.each(&:join)
    end
  rescue TimeoutError
    raise "instances timed out waiting for ec2"
  end

  ip_addresses.each do |ipaddr|
    ChefWorkflow::IPSupport.assign_role_ip(name, ipaddr)
  end

  return ip_addresses
end