Class: Cql::Client::ConnectionHelper

Inherits:
Object
  • Object
show all
Defined in:
lib/cql/client/connection_helper.rb

Defined Under Namespace

Classes: FailedConnection

Instance Method Summary collapse

Constructor Details

#initialize(io_reactor, port, credentials, connections_per_node, connection_timeout, logger) ⇒ ConnectionHelper

Returns a new instance of ConnectionHelper.



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# File 'lib/cql/client/connection_helper.rb', line 7

def initialize(io_reactor, port, credentials, connections_per_node, connection_timeout, logger)
  @io_reactor = io_reactor
  @port = port
  @credentials = credentials
  @connections_per_node = connections_per_node
  @connection_timeout = connection_timeout
  @logger = logger
  @request_runner = RequestRunner.new
  @keyspace_changer = KeyspaceChanger.new
end

Instance Method Details

#connect(hosts, initial_keyspace) ⇒ Object 



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# File 'lib/cql/client/connection_helper.rb', line 18

def connect(hosts, initial_keyspace)
  f = @io_reactor.start.flat_map do
    connect_to_hosts(hosts, initial_keyspace, true)
  end
  f = f.map do |connections|
    connected_connections = connections.select(&:connected?)
    if connected_connections.empty?
      e = connections.first.error
      if e.is_a?(Cql::QueryError) && e.code == 0x100
        e = AuthenticationError.new(e.message)
      end
      raise e
    end
    connected_connections
  end
  f
end

#discover_peers(seed_connections, initial_keyspace) ⇒ Object 



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# File 'lib/cql/client/connection_helper.rb', line 36

def discover_peers(seed_connections, initial_keyspace)
  @logger.debug('Looking for additional nodes')
  connection = seed_connections.sample
  return Future.resolved([]) unless connection
  request = Protocol::QueryRequest.new('SELECT peer, data_center, host_id, rpc_address FROM system.peers', :one)
  peer_info = @request_runner.execute(connection, request)
  peer_info.flat_map do |result|
    seed_dcs = seed_connections.map { |c| c[:data_center] }.uniq
    unconnected_peers = result.select do |row|
      seed_dcs.include?(row['data_center']) && seed_connections.none? { |c| c[:host_id] == row['host_id'] }
    end
    if unconnected_peers.empty?
      @logger.debug('No additional nodes found')
    else
      @logger.debug('%d additional nodes found' % unconnected_peers.size)
    end
    node_addresses = unconnected_peers.map do |row|
      rpc_address = row['rpc_address'].to_s
      if rpc_address == '0.0.0.0'
        row['peer'].to_s
      else
        rpc_address
      end
    end
    if node_addresses.any?
      connect_to_hosts(node_addresses, initial_keyspace, false)
    else
      Future.resolved([])
    end
  end
end