Module: Awsam::Ec2

Defined in:
lib/awsam/ec2.rb

Constant Summary collapse

LOOKUP_TAGS = 
["Name", "aws:autoscaling:groupName", "AlsoKnownAs"].freeze

Class Method Summary collapse

Class Method Details

.find(ec2, instance_id) ⇒ Object 



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# File 'lib/awsam/ec2.rb', line 29

def self.find(ec2, instance_id)
  if instance_id =~ /^i-[0-9a-f]{8,17}$/
    find_by_instance_id(ec2, instance_id)
  else
    find_by_tag(ec2, instance_id)
  end
end

.find_by_instance_id(ec2, instance_id) ⇒ Object 



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# File 'lib/awsam/ec2.rb', line 37

def self.find_by_instance_id(ec2, instance_id)
  begin
    ec2.describe_instances(instance_id).first
  rescue RightAws::AwsError
    puts "instance_id does not exist"
    exit 1
  end
end

.find_by_tag(ec2, instance_id) ⇒ Object 



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# File 'lib/awsam/ec2.rb', line 46

def self.find_by_tag(ec2, instance_id)
  results = []

  ec2.describe_tags(:filters => {
                      "resource-type" => "instance"
                    }).each do |tag|
    if LOOKUP_TAGS.include?(tag[:key]) &&
        tag[:value].downcase.include?(instance_id.downcase)
      results << tag
    end
  end

  if !results || results.length == 0
    puts "No tags by this name are available in your account"
    exit 1
  end
  
  results.uniq! { |a| a[:resource_id] }
  results.sort! { |a,b| a[:value] <=> b[:value] }

  rmap = {}
  ec2.describe_instances(results.map{|a| a[:resource_id]},
                         :filters => {
                           "instance-state-name" => "running"
                         }).each do |inst|
    rmap[inst[:aws_instance_id]] = inst
  end

  results.reject! { |a| rmap[a[:resource_id]].nil? }

  if results.length == 0
    puts "No running instances by that tag name are available"
    exit 1
  end

  if $opts[:first_node] || results.length == 1
    node = results.first
  else
    puts "Please select which node you wish to use:"
    puts

    results.each_with_index do |elem, i|
      inst = rmap[elem[:resource_id]]
      puts "%d) %s (%s, %s, %s, %s)" %
        [i, elem[:value], inst[:aws_instance_id],
         inst[:aws_instance_type],
         inst[:aws_availability_zone],
         inst[:aws_launch_time]]
    end
    puts "q) Quit"
    puts

    print "> "
    input = $stdin.gets
    puts
    exit unless input =~ /^\d+$/
    node = results[input.to_i]
  end

  return rmap[node[:resource_id]]
end

.find_instance(acct, instance_id) ⇒ Object 



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# File 'lib/awsam/ec2.rb', line 15

def self.find_instance(acct, instance_id)
  logger = Logger.new(File.open("/dev/null", "w"))
  ec2 = RightAws::Ec2.new(acct.access_key, acct.secret_key,
                          :logger => logger,
                          :endpoint_url => acct.ec2_url)
  
  unless ec2
    puts "Unable to connect to EC2"
    return nil
  end

  find(ec2, instance_id)
end

.instance_hostname(inst) ⇒ Object 



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# File 'lib/awsam/ec2.rb', line 6

def self.instance_hostname(inst)
  hostname = inst[:dns_name]
  # Are we in a VPC?
  if inst[:vpc_id]
    hostname = inst[:private_ip_address]
  end
  hostname
end