module AWS::SNS::FromAutoScaling

def self.extended base
  base.origin = :autoscaling
end

def applicable? sns
  sns['Subject'] =~ /.*autoscaling:.*/i
end

def body
  return @body if defined? @body
  @body = self.parse_from self.raw['Message']
end

def event
  return @event if defined? @event
  e = body['Event']
  @event = case
    when e =~ /EC2_INSTANCE_TERMINATE/ then :ec2_instance_terminate
    when e =~ /EC2_INSTANCE_TERMINATE_ERROR/ then :ec2_instance_terminate_error
    when e =~ /EC2_INSTANCE_LAUNCH/ then :ec2_instance_launch
    when e =~ /EC2_INSTANCE_LAUNCH_ERROR/ then :ec2_instance_launch_error
    when e =~ /TEST_NOTIFICATION/ then :test_notification
    else :unknown
  end
end

def group_name
  body['AutoScalingGroupName']
end

def instance_id
  body['EC2InstanceId']
end

def status_code
  body['StatusCode']
end