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Instance Method Summary collapse

Instance Method Details

#backoff ⇒ Object 



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# File 'bin/ec2-rotate-volume-snapshots', line 24

def backoff()
  $backoffed = $backoffed + 1

  if $opts[:backoff_limit] > 0 && $opts[backoff_limit] < $backoffed
    puts "Too many backoff attempts. Sorry it didn't work out."
    exit 2
  end

  naptime = rand(60) * $backoffed
  puts "Backing off for #{naptime} seconds..."
  sleep naptime
end

#rotate_em(snapshots) ⇒ Object 



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# File 'bin/ec2-rotate-volume-snapshots', line 37

def rotate_em(snapshots)
  # poor man's way to get a deep copy of our time_periods definition hash
  periods = Marshal.load(Marshal.dump($time_periods))
  
  snapshots.each do |snapshot|
    time = Time.parse(snapshot[:aws_started_at])
    snapshot_id = snapshot[:aws_id]
    description = snapshot[:aws_description]
    keep_reason = nil
    
    if $opts[:pattern] && description !~ /#{$opts[:pattern]}/
      puts "  #{time.strftime '%Y-%m-%d %H:%M:%S'} #{snapshot_id} Skipping snapshot with description #{description}"
      next
    end
    
    periods.keys.sort { |a, b| periods[a][:seconds] <=> periods[b][:seconds] }.each do |period|
      period_info = periods[period]
      keep = period_info[:keep]
      keeping = period_info[:keeping]
      
      time_string = time.strftime period_info[:format]
      if Time.now - time < keep * period_info[:seconds]
        if !keeping.key?(time_string) && keeping.length < keep
          keep_reason = period
          keeping[time_string] = snapshot
        end
        break
      end
    end
    
    if keep_reason.nil? && snapshot == snapshots.last && $opts[:keep_last]
      keep_reason = 'last snapshot'
    end
    
    if !keep_reason.nil?
      puts "  #{time.strftime '%Y-%m-%d %H:%M:%S'} #{snapshot_id} Keeping for #{keep_reason}"
    else
      puts "  #{time.strftime '%Y-%m-%d %H:%M:%S'} #{snapshot_id} Deleting"
      begin
        $ec2.delete_snapshot(snapshot_id) unless $opts[:dry_run]
      rescue RightAws::AwsError => e
        # If we have been sending too many EC2 requests, then let's backoff a random
        # amount of time and try again later.
        if e.errors.kind_of? Array
          if e.errors[0][0] == 'RequestLimitExceeded'
            backoff()
            retry
          else
            raise e
          end
        else
          raise e
        end
      end
    end
  end
end

#split_tag(hash, v) ⇒ Object 



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# File 'bin/ec2-rotate-volume-snapshots', line 96

def split_tag(hash,v)
    v.split(',').each do |pair|
        tag, value = pair.split('=',2)
        if value.nil?
          puts "invalid tag=value format"
          exit 1
        end
        hash[tag] = value
    end
end