Class: Braavos::Service::Cassandra

Inherits:
Object
  • Object
show all
Defined in:
lib/braavos/service/cassandra.rb

Constant Summary collapse

DEFAULT_KEYSPACES_SYSTEM = 
['system', 'system_auth', 'system_traces']

Instance Method Summary collapse

Instance Method Details

#backup_full ⇒ Object 



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# File 'lib/braavos/service/cassandra.rb', line 43

def backup_full
  backup_id = Braavos::Service.full_backup_id
  backup_path = File.join(Braavos.config.backup_path, 'full', backup_id, Braavos.storage.find_node_id)
  data_path = File.join(Braavos.config.backup_path, 'data', Braavos.storage.find_node_id)

  if Braavos.storage.has_success?(backup_path)
    raise "Backup currently exists: #{backup_id} - #{Braavos.storage.script_path(backup_path)}"
  else
    Braavos.storage.clear_result(backup_path)
  end

  Dir.mktmpdir('brav-bkup') do |tmpd|
    File.write(File.join(tmpd, 'cluster.json'), JSON.pretty_generate(Braavos.storage.get_cluster))

    write_whoami(tmpd)
    keyspaces_data.each do |keyspace|
      write_describering(tmpd, keyspace)
    end

    Braavos.command.execute(Braavos.template.load_template('cassandra/system_bundle.sh.erb'), [tmpd, Braavos.config.data_loc, *keyspaces_system])

    Braavos.parallel.execute(Braavos.template.load_template('cassandra/dump_schema.sh.erb', local_host_ip: Braavos::Service.local_host_ip), keyspaces_data.map{|k| [k, tmpd]})

    Dir["#{tmpd}/*"].each do |f|
      Braavos.storage.write_file(File.join(backup_path, File.basename(f)), file: f)
    end
  end

  script = Braavos.template.load_template('cassandra/create_snapshot.sh.erb')
  keyspaces_data.each do |keyspace|
    Braavos.command.execute(script, [keyspace, backup_id])
  end

  table_list = list_tables("snapshots/#{backup_id}")

  contents = Hash[tables: table_list.map do |t| "#{t[1]}.tgz" end]
  Braavos.storage.write_file(File.join(backup_path, 'contents.json'), JSON.pretty_generate(contents))

  # remove tables that are unchanged
  data_listings = Braavos.storage.list_dir(data_path).map do |k, v|
    k.sub(/^#{data_path}\//, '').sub(/\.tgz\Z/, '')
  end
  table_list.delete_if do |t|
    data_listings.include? t[1]
  end
  Braavos.logger.debug("executing table_list: #{table_list}")
  Braavos.logger.info("Processing Table Count: #{table_list.size}")

  script = Braavos.template.load_template('cassandra/table_bundle_upload.sh.erb')
  script_input = table_list.map do |t|
    [t[0], Braavos.storage.script_path(File.join(data_path, "#{t[1]}.tgz"))]
  end
  Braavos.parallel.execute(script, script_input) if script_input.size > 0

  Braavos.storage.write_file(File.join(backup_path, '_COMPLETED'), '')
rescue => e
  begin
    Braavos.storage.write_file(File.join(backup_path, '_FAILED'), "#{e.message}\n#{e.backtrace}")
  rescue => ig
    Braavos.logger.error("_FAILED failed, ignoring")
  end
  raise e
ensure
  script = Braavos.template.load_template('cassandra/clear_snapshot.sh.erb')
  keyspaces_data.each do |keyspace|
    begin
      Braavos.command.execute(script, [keyspace, backup_id])
    rescue => e
      Braavos.logger.error("clear snapshot #{keyspace} failed, ignoring")
    end
  end
end

#find_snapshots ⇒ Object 



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# File 'lib/braavos/service/cassandra.rb', line 156

def find_snapshots
  results = `find #{Braavos.config.data_loc} -type d -wholename '*/snapshots/*'`.split("\n").select {|s| not s =~ /\/_.*$/ }

end

#keyspaces ⇒ Object 



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# File 'lib/braavos/service/cassandra.rb', line 11

def keyspaces
  @keyspaces ||= -> do
    result = Dir[File.join(Braavos.config.data_loc, '*')].map do |d|
      d.sub(/\A#{Braavos.config.data_loc}\//, '')
    end
    Braavos.logger.debug("Found cassandra keyspaces: #{result}")
    result
  end.call
end

#keyspaces_data ⇒ Object 



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# File 'lib/braavos/service/cassandra.rb', line 21

def keyspaces_data
  @keyspaces_data ||= -> do
    if regex = Braavos.config.get_regex('cassandra_keyspaces_data')
      Braavos.logger.debug("Cassandra Data Keyspaces: regex = #{regex}")
      keyspaces.select do |k| regex =~ k end
    else
      keyspaces - DEFAULT_KEYSPACES_SYSTEM
    end
  end.call
end

#keyspaces_system ⇒ Object 



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# File 'lib/braavos/service/cassandra.rb', line 32

def keyspaces_system
  @keyspaces_system ||= -> do
    if regex = Braavos.config.get_regex('cassandra_keyspaces_system')
      Braavos.logger.debug("Cassandra System Keyspaces: regex = #{regex}")
      keyspaces.select do |k| regex =~ k end
    else
      DEFAULT_KEYSPACES_SYSTEM & keyspaces
    end
  end.call
end

#list_tables(location) ⇒ Object

return [[disk_loc, ‘table_name’]]



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# File 'lib/braavos/service/cassandra.rb', line 138

def list_tables(location)
  # Example for table_name:
  # /usr/local/var/lib/cassandra/data/place_directory_development/Places/snapshots/TODAY/place_directory_development-Places-ib-1-CompressionInfo.db
  # returned as "place_directory_development/Places/place_directory_development-Places-ib-1"
  tables = Set.new
  Dir[File.join(Braavos.config.data_loc, '**', location, '*')].each do |file|
    next if file =~ /.json\Z/ # Some versions of cassandra use Table and Table.index json files in the sstable storage location
    file.sub!(/-[\w.]+\Z/, '')
    if match = file.match(/\A#{Braavos.config.data_loc}\/([\w\/]+)\/#{location}\/([-\w\.]+)\Z/)
      ks_table, ssfile = match.captures
      tables << [file, File.join(ks_table, ssfile)]
    else
      Braavos.logger.warn("Found unexpected file in snapshot: #{file}")
    end
  end
  tables.to_a
end

#restore(backup_loc, restore_loc) ⇒ Object 



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# File 'lib/braavos/service/cassandra.rb', line 116

def restore(backup_loc, restore_loc)
  backup_path = File.join(Braavos.config.backup_path, backup_loc, Braavos.storage.find_node_id)
  data_path = File.join(Braavos.config.backup_path, 'data', Braavos.storage.find_node_id)

  Braavos.storage.load_file(File.join(backup_path, '_COMPLETED'))

  contents = JSON.parse(Braavos.storage.load_file(File.join(backup_path, 'contents.json')))

  script = Braavos.template.load_template('cassandra/table_bundle_restore.sh.erb')
  script_input = contents['tables'].map do |t|
    [Braavos.storage.script_path(File.join(data_path, t)), File.join(restore_loc, File.dirname(t))]
  end
  Braavos.parallel.execute(script, script_input) if script_input.size > 0

  Braavos.logger.info("Restore completed: #{backup_loc} to #{restore_loc}")
end

#restore_incr ⇒ Object 



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# File 'lib/braavos/service/cassandra.rb', line 133

def restore_incr

end

#token ⇒ Object 



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# File 'lib/braavos/service/cassandra.rb', line 7

def token
  @token ||= safely_retrieve_token
end