Class: Drebs::Cloud

Inherits:
Object
  • Object
show all
Defined in:
lib/drebs/cloud.rb

Instance Method Summary collapse

Constructor Details

#initialize(config) ⇒ Cloud

Returns a new instance of Cloud.



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# File 'lib/drebs/cloud.rb', line 5

def initialize(config)
  @config = config
end

Instance Method Details

#check_cloud ⇒ Object 



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# File 'lib/drebs/cloud.rb', line 9

def check_cloud
  ec2
  find_local_instance
end

#create_local_snapshot(pre_snapshot_tasks, post_snapshot_tasks, mount_point) ⇒ Object 



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# File 'lib/drebs/cloud.rb', line 50

def create_local_snapshot(pre_snapshot_tasks, post_snapshot_tasks, mount_point)
  local_instance=find_local_instance
  ip = local_instance[:ip_address]
  instance_id = local_instance[:aws_instance_id]
  volume_id = local_instance[:block_device_mappings].select{|m| m[:device_name]==mount_point}.first[:ebs_volume_id]
  return nil if not ebs = find_local_ebs(mount_point)
  pre_snapshot_tasks.each do |task|
    result, stdout, stderr = systemu(task)
    unless result.exitstatus == 0
      raise Exception(
        "Error while executing pre-snapshot task: #{task} on #{ip}:#{mount_point} #{instance_id}:#{volume_id} "
      )
    end
  end if pre_snapshot_tasks
  snapshot = ec2.create_snapshot(ebs[:ebs_volume_id], "DREBS #{ip}:#{mount_point} #{instance_id}:#{volume_id}")
  Thread.new(snapshot[:aws_id], post_snapshot_tasks) do |snapshot_id, post_snapshot_tasks|
    1.upto(500) do |a|
      sleep(3)
      break if get_snapshot(snapshot_id)[:aws_status] == 'completed'
    end
    post_snapshot_tasks.each do |task|
      result = systemu(task)
      unless result.exitstatus == 0
        raise Exception(
          "Error while executing post-snapshot task: #{task} on #{ip}:#{mount_point} #{instance_id}:#{volume_id} "
        )
      end
    end if post_snapshot_tasks
  end
  return snapshot
end

#ec2 ⇒ Object 



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# File 'lib/drebs/cloud.rb', line 14

def ec2
  key_id = @config["aws_access_key_id"]
  key = @config["aws_secret_access_key"]
  region = @config["region"]
  return RightAws::Ec2.new(key_id, key, {:region=>region})
end

#find_local_ebs(mount_point) ⇒ Object 



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# File 'lib/drebs/cloud.rb', line 30

def find_local_ebs(mount_point)
  return nil if not local_instance = find_local_instance
  local_instance[:block_device_mappings].each do |volume|
    return volume if volume[:device_name] == mount_point
  end
  return nil
end

#find_local_instance ⇒ Object 



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# File 'lib/drebs/cloud.rb', line 21

def find_local_instance
  #find a better way... right-aws?
  private_ip = UDPSocket.open{|s| s.connect("8.8.8.8", 1); s.addr.last}
  ec2.describe_instances.each do |instance|
    return instance if instance[:private_ip_address] == private_ip
  end
  return nil
end

#find_local_snapshots(mount_point) ⇒ Object 



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# File 'lib/drebs/cloud.rb', line 82

def find_local_snapshots(mount_point)
  return nil if not ebs = find_local_ebs(mount_point)
  snapshots = []
  ec2.describe_snapshots.each {|snapshot|
    snapshots.push(snapshot) if snapshot[:aws_volume_id] == ebs[:ebs_volume_id]
  }
  return snapshots
end

#get_snapshot(snapshot_id) ⇒ Object 



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# File 'lib/drebs/cloud.rb', line 44

def get_snapshot(snapshot_id)
  ec2.describe_snapshots {|a_snapshot|
    return a_snapshot if a_snapshot[:aws_id] == snapshot_id
  }
end

#local_ebs_ids ⇒ Object 



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# File 'lib/drebs/cloud.rb', line 38

def local_ebs_ids
  @ebs_ids ||= find_local_instance[:block_device_mappings].map do |volume| 
    volume[:ebs_volume_id]
  end rescue nil
end