Class: Aebus::Core

Inherits:
Object
  • Object
show all
Includes:
Logging
Defined in:
lib/aebus.rb

Constant Summary collapse

AWS_NAME_TAG = 
"Name"
AEBUS_TAG = 
"Aebus"

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Logging

log_to_file, logger, #logger

Class Method Details

.name_and_desc(volume_id, tags, utc_time) ⇒ Array

calculates the name and the description to be set to a snapshot

Parameters:

  • volume_id (String) —

    the id of the volume whose snapshot we are creating

  • tags (Array) —

    the tags currently associated with the Volume

  • utc_time (Time) —

    the UTC time at which the backup process started (used to generate the correct name)

Returns:

  • (Array) —

    an array in the form of [name, description]]



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# File 'lib/aebus.rb', line 227

def self.name_and_desc(volume_id, tags, utc_time)

  name = "backup_#{utc_time.strftime("%Y%m%d")}_#{volume_id}"
  volume_name = volume_id
  tags.each do |tag|
    if tag["key"].eql?(AWS_NAME_TAG)
      volume_name = tag["value"]
      break
    end
  end

  description = "Backup for volume #{volume_name} taken at #{utc_time.strftime("%Y-%m-%d %H:%M:%S")}"

  return [name, description]

end

Instance Method Details

#backup(args, options) ⇒ Object 



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# File 'lib/aebus.rb', line 89

def backup(args, options)


  backed_up = 0
  max_delay = 0
  purged = 0
  to_purge = 0
  to_backup = 0
  @current_time_utc = Time.now.utc
  @config = Config::Config.new(File.join(File.dirname("."), options.config), @current_time_utc)

  init_logger options
  logger.info("backup started at #{@current_time_utc}")

  @ec2 = AWS::EC2::Base.new(:access_key_id => @config.defaults["access_key_id"],
                            :secret_access_key => @config.defaults["secret_access_key"],
                            :server => EC2::zone_to_url(@config.defaults["zone"]))

  target_volumes = target_volumes(args)

  abort("Configuration contains invalid volumes") unless validate_target_volumes(target_volumes)

  if (options.manual) then

    target_volumes.each do |volume|
      to_backup += 1
      break unless backup_volume(volume, [EC2::AEBUS_MANUAL_TAG])
      backed_up += 1

    end

  else

    snap_map = get_snapshots_map

    target_volumes.each do |target|

      volume = @config.volumes[target]
      to_be_run = volume.backups_to_be_run(snap_map[target], @current_time_utc)
      max_delay = [max_delay, to_be_run[0]].max
      tags = to_be_run[1]
      if tags.count > 0
        tags << EC2::AEBUS_AUTO_TAG
        logger.info("Creating backup for volume #{target} with tags #{tags.join(',')}, max delay #{max_delay}")
        to_backup +=1
        break unless backup_volume(target, tags)
        backed_up += 1
      else
        logger.info("Volume #{target} does not need to be backed up")
      end

    end

    snap_map = get_snapshots_map # we reload the map since we may have created more snapshots
    if options.purge then
      target_volumes.each do |target|
        volume = @config.volumes[target]
        purgeable_snapshot_ids = volume.purgeable_snapshot_ids(snap_map[target])
        purgeable_snapshot_ids.each do |snapshot_id|
          to_purge += 1
          purged += 1 if purge_snapshot(snapshot_id)

        end
      end
    else
      logger.info("Skipping purging phase")
    end

  end

  message = "Backup Completed at #{Time.now}. Checked #{target_volumes.count} volume(s), #{to_backup} to be backed up, #{backed_up} actually backed up, max delay detected #{max_delay}s,  #{to_purge} purgeable snapshot(s), #{purged} purged"
  logger.info(message)
  puts(message)
  if to_backup > 0 or to_purge > 0 then
    send_report message
  end
end

#backup_volume(volume_id, tags) ⇒ boolean

backs up a given volume using the given time as part of the name and setting the given tags to the snapshot

Parameters:

  • volume_id (String) —

    the id of the volume to be backed up

  • tags (Array) —

    an array of String to be used as tags for the snapshot

Returns:

  • (boolean) —

    true if the backup was successful, false otherwise



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# File 'lib/aebus.rb', line 186

def backup_volume(volume_id, tags)
  begin
    volume_info = @ec2.describe_volumes(:volume_id => volume_id)

  rescue AWS::Error => e
    logger.error("Volume Id #{volume_id} not found. Underlying message #{e.message}")
    return false
  end

  begin
    tag_set = volume_info.volumeSet.item[0].tagSet
    volume_tags = (tag_set and tag_set.item) ? tag_set.item : []

    name_and_desc = Core.name_and_desc(volume_id, volume_tags, @current_time_utc)
    create_response = @ec2.create_snapshot(:volume_id => volume_id, :description => name_and_desc[1])

  rescue AWS::Error => e
    logger.error("Volume Id #{volume_id} could not be backed up. Underlying message #{e.message}")
    return false
  end

  begin

    @ec2.create_tags(:resource_id => create_response.snapshotId,
                     :tag => [{AWS_NAME_TAG => name_and_desc[0]}, {AEBUS_TAG => tags.join(',')}])
  rescue AWS::Error => e
    logger.error("[WARNING] Could not set tags to snapshot #{create_response.snapshotId}. Underlying message #{e.message}")
    return false
  end

  logger.info("Created snapshot #{create_response.snapshotId} for volume #{volume_id}")

  true

end

#check_status(target_volumes) ⇒ Object 



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# File 'lib/aebus.rb', line 48

def check_status(target_volumes)
  result = {}
  result[:timestamp] = @current_time_utc
  snap_map = get_snapshots_map
  result[:volumes] = Array.new
  to_backup = 0
  to_purge = 0
  target_volumes.each do |target|
    vs = VolumeStatus.new(target)
    volume = @config.volumes[target]
    vs.last_backup = volume.last_backup
    vs.next_backup = volume.next_backup
    to_be_run = volume.backups_to_be_run(snap_map[target], @current_time_utc)

    vs.delay = to_be_run[0]
    vs.tags = to_be_run[1]

    if vs.needs_backup?
      logger.info("Volume #{target} needs to be backed up. Tags: #{vs.tags.join(',')}, max delay #{vs.delay}")
      to_backup += 1
    else
      logger.info("Volume #{target} does not need to be backed up")
    end

    vs.purgeable_snapshot_ids = volume.purgeable_snapshot_ids(snap_map[target])
    to_purge += vs.purgeable_snapshot_ids.count  if vs.purgeable_snapshot_ids
    logger.info("Volume #{target} has #{vs.purgeable_snapshot_ids.count} purgeable snapshot(s): #{vs.purgeable_snapshot_ids.join(',')}")

    result[:volumes] << vs

  end
  result[:to_backup] = to_backup
  result[:to_purge] = to_purge
  result[:delay] = result[:volumes].inject([0]) {|acc, vs| acc << vs.delay}.max
  result[:total] = result[:volumes].count
  result

end

#get_snapshots_map ⇒ Object 



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# File 'lib/aebus.rb', line 244

def get_snapshots_map

  response = @ec2.describe_snapshots(:owner => 'self')
  snap_array = response.snapshotSet.item
  result = Hash.new
  snap_array.each do |snap|
    snapshot = EC2::Snapshot.new(snap)
    if result.include?(snapshot.volume_id)
      vol_array = result[snapshot.volume_id]
      index = vol_array.index{ |s| snapshot.start_time > s.start_time}
      index ||= vol_array.count
      vol_array.insert(index, snapshot)
    else
      vol_array = Array.new
      vol_array << snapshot
      result.store(snapshot.volume_id, vol_array)
    end
  end
  result

end

#init_logger(options) ⇒ Object 



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# File 'lib/aebus.rb', line 178

def init_logger(options)
  Logging.log_to_file(options.logfile) unless options.logfile.nil?
end

#purge_snapshot(snapshot_id) ⇒ Object 



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# File 'lib/aebus.rb', line 266

def purge_snapshot(snapshot_id)
  begin
    response = @ec2.delete_snapshot(:snapshot_id => snapshot_id)
    if response['return']
      logger.info("Purged snapshot #{snapshot_id}")
      true
    else
      false
    end
  rescue AWS::Error => e
    logger.warn("Could not purge snapshot #{snapshot_id}; underlying message #{e.message}")
    false
  end

end

#send_report(message) ⇒ Object 



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# File 'lib/aebus.rb', line 294

def send_report(message)
  if message.nil?
    logger.warn('Tried to send a message, but no message was specified')
    return
  end
  to_address = @config.defaults["to_address"]
  from_address = @config.defaults["from_address"]
  if to_address.nil? or from_address.nil?
    logger.warn('Tried to send a message but either to or from address where missing from configuration')
    return
  end
  ses = AWS::SES::Base.new(
    :access_key_id     => @config.defaults["access_key_id"],
    :secret_access_key => @config.defaults["secret_access_key"]
  )
  logger.info("Sending report to #{to_address} from account #{from_address}")
  ses.send_email :to => to_address,
                 :source => from_address,
                 :subject => "Aebus Report",
                 :text_body => message

end

#status(args, options) ⇒ Object 



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# File 'lib/aebus.rb', line 22

def status(args, options)
  @current_time_utc = Time.now.utc
  init_logger options
  logger.info("status check started at #{@current_time_utc}")

  @config = Config::Config.new(File.join(File.dirname("."), options.config), @current_time_utc)
  @ec2 = AWS::EC2::Base.new(:access_key_id => @config.defaults["access_key_id"],
                            :secret_access_key => @config.defaults["secret_access_key"],
                            :server => EC2::zone_to_url(@config.defaults["zone"]))



  target_volumes = target_volumes(args)

  abort("Configuration contains invalid volumes") unless validate_target_volumes(target_volumes)

  status = check_status(target_volumes)

  message = "status check completed - #{status[:total]} volume(s) checked,  #{status[:to_backup]} to be backed up, max delay detected #{status[:delay]}s, #{status[:to_purge]} snapshots to be purged"
  logger.info message
  puts message



end

#target_volumes(args) ⇒ Object 



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# File 'lib/aebus.rb', line 167

def target_volumes(args)

  result = @config.volume_ids
  if args && (args.count > 0) then
    result &= args
  end

  result

end

#validate_target_volumes(target_volumes) ⇒ Object 



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# File 'lib/aebus.rb', line 282

def validate_target_volumes(target_volumes)
  begin
    @ec2.describe_volumes(:volume_id => target_volumes)
    logger.info("Target volumes validated")
    true
  rescue AWS::Error => e
    logger.error("Target validation failed with message '#{e.message}' Check your configuration")
    false
  end

end