Class: Muck::Backup

Inherits:
Object
  • Object
show all
Includes:
Logging, Utils
Defined in:
lib/muck/backup.rb

Instance Method Summary collapse

Methods included from Utils

#blue, #green, #pink, #red, #yellow

Methods included from Logging

#log, #logger

Constructor Details

#initialize(database) ⇒ Backup

Returns a new instance of Backup.



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# File 'lib/muck/backup.rb', line 11

def initialize(database)
  @database = database
  @time = Time.now
end

Instance Method Details

#compress ⇒ Object 



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# File 'lib/muck/backup.rb', line 70

def compress
  if File.exist?(export_path)
    if system("gzip #{export_path}")
      @export_path = @export_path + ".gz"
      logger.info "Compressed #{blue export_path} with gzip"
    else
      logger.warn "Couldn't compress #{export_path} with gzip"
    end
  else
    raise Error, "Couldn't compress backup because it doesn't exist at #{export_path}"
  end
end

#export_path ⇒ Object 



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# File 'lib/muck/backup.rb', line 16

def export_path
  @export_path ||= File.join(@database.export_path, "master", @time.strftime("%Y-%m-%d-%H-%M-%S.sql"))
end

#run ⇒ Object 



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# File 'lib/muck/backup.rb', line 20

def run
  logger.info "Backing up #{blue @database.name} from #{blue @database.server.hostname}"
  take_backup
  compress
  store_in_manifest
  tidy_masters
end

#store_in_manifest ⇒ Object 



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# File 'lib/muck/backup.rb', line 60

def store_in_manifest
  if File.exist?(export_path)
    details = {:timestamp => @time.to_i, :path => export_path, :size => File.size(export_path)}
    @database.manifest[:backups] << details
    @database.save_manifest
  else
    raise Error, "Couldn't store backup in manifest because it doesn't exist at #{export_path}"
  end
end

#take_backup ⇒ Object 



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# File 'lib/muck/backup.rb', line 28

def take_backup
  logger.info "Connecting to #{blue @database.server.ssh_username}@#{blue @database.server.hostname}:#{blue @database.server.ssh_port}"
  FileUtils.mkdir_p(File.dirname(self.export_path))
  file = File.open(export_path, 'w')
  ssh_session = @database.server.create_ssh_session
  channel = ssh_session.open_channel do |channel|
    logger.debug "Running: #{@database.dump_command}"
    channel.exec(@database.dump_command) do |channel, success|
      raise Error, "Could not execute dump command" unless success
      channel.on_data do |c, data|
        file.write(data)
      end

      channel.on_extended_data do |c, _, data|
        logger.debug red(data.gsub(/[\r\n]/, ''))
      end

      channel.on_request("exit-status") do |_, data|
        exit_code = data.read_long
        if exit_code != 0
          logger.debug "Exit status was #{exit_code}"
          raise Error, "mysqldump returned an error when executing."
        end
      end
    end
  end
  channel.wait
  ssh_session.close
  file.close
  logger.info "Successfully backed up to #{green export_path}"
end

#tidy_masters ⇒ Object 



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# File 'lib/muck/backup.rb', line 83

def tidy_masters
  files = Dir[File.join(@database.export_path, 'master', '*')].sort.reverse.drop(@database.server.masters_to_keep)
  unless files.empty?
    logger.info "Tidying master backup files. Keeping #{@database.server.masters_to_keep} back."
    files.each do |file|
      if system("rm #{file}")
        @database.manifest[:backups].delete_if { |b| b[:path] == file }
        logger.info "-> Removed #{green file}"
      else
        logger.error red("-> Couldn't remove unwanted master file at #{file}")
      end
    end
  end
ensure
  @database.save_manifest
end