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Class: DRb::DRbTCPSocket

Do not use. This class is for internal use only.
Relationships & Source Files
Extension / Inclusion / Inheritance Descendants
Subclasses:
DRbSSLSocket, DRbUNIXSocket
Inherits: Object
Defined in: lib/drb/drb.rb

Overview

The default drb protocol which communicates over a TCP socket.

The DRb TCP protocol URI looks like: druby://<host>:<port>?<option>. The option is optional.

Class Method Summary

Instance Attribute Summary

Instance Method Summary

Constructor Details

.new(uri, soc, config = {}) ⇒ DRbTCPSocket

Create a new DRbTCPSocket instance.

#uri is the URI we are connected to. soc is the tcp socket we are bound to. DRb.config is our configuration.

[ GitHub ] 

  


# File 'lib/drb/drb.rb', line 903



def initialize(uri, soc, config={})
  @uri = uri
  @socket = soc
  @config = config
  @acl = config[:tcp_acl]
  @msg = DRbMessage.new(config)
  set_sockopt(@socket)
  @shutdown_pipe_r, @shutdown_pipe_w = IO.pipe
end


  







Class Method Details



  

    .getservername  
  



  

    

Returns the hostname of this server


  



  [ GitHub ]


  

  


# File 'lib/drb/drb.rb', line 845



def self.getservername
  host = Socket::gethostname
  begin
    Socket::getaddrinfo(host, nil,
                              Socket::AF_UNSPEC,
                              Socket::SOCK_STREAM,
                              0,
                              Socket::AI_PASSIVE)[0][3]
  rescue
    'localhost'
  end
end


  








  

    .open(uri, config)  
  



  

    

Open a client connection to #uri (DRb URI string) using configuration DRb.config.



This can raise DRbBadScheme or DRbBadURI if #uri is not for a recognized protocol.  See DRbServer.new for information on built-in URI protocols.


  



  [ GitHub ]


  

  


# File 'lib/drb/drb.rb', line 838



def self.open(uri, config)
  host, port, = parse_uri(uri)
  soc = TCPSocket.open(host, port)
  self.new(uri, soc, config)
end


  








  

    .open_server(uri, config)  
  



  

    

Open a server listening for connections at #uri using configuration DRb.config.


  



  [ GitHub ]


  

  


# File 'lib/drb/drb.rb', line 876



def self.open_server(uri, config)
  uri = 'druby://:0' unless uri
  host, port, _ = parse_uri(uri)
  config = {:tcp_original_host => host}.update(config)
  if host.size == 0
    host = getservername
    soc = open_server_inaddr_any(host, port)
  else
    soc = TCPServer.open(host, port)
  end
  port = soc.addr[1] if port == 0
  config[:tcp_port] = port
  uri = "druby://#{host}:#{port}"
  self.new(uri, soc, config)
end


  








  

    .open_server_inaddr_any(host, port)  
  



  

    

For the families available for host, returns a TCPServer on port. If port is 0 the first available port is used.  IPv4 servers are preferred over IPv6 servers.


  



  [ GitHub ]


  

  


# File 'lib/drb/drb.rb', line 861



def self.open_server_inaddr_any(host, port)
  infos = Socket::getaddrinfo(host, nil,
                              Socket::AF_UNSPEC,
                              Socket::SOCK_STREAM,
                              0,
                              Socket::AI_PASSIVE)
  families = Hash[*infos.collect { |af, *_| af }.uniq.zip([]).flatten]
  return TCPServer.open('0.0.0.0', port) if families.has_key?('AF_INET')
  return TCPServer.open('::', port) if families.has_key?('AF_INET6')
  return TCPServer.open(port)
  # :stopdoc:
end


  








  

    .parse_uri(uri)   (private)
  

  [ GitHub ]


  

  


# File 'lib/drb/drb.rb', line 818



def self.parse_uri(uri)
  if /\Adruby:\/\/(.*?):(\d+)(\?(.*))?\z/ =~ uri
    host = $1
    port = $2.to_i
    option = $4
    [host, port, option]
  else
    raise(DRbBadScheme, uri) unless uri.start_with?('druby:')
    raise(DRbBadURI, 'can\'t parse uri:' + uri)
  end
end


  








  

    .uri_option(uri, config)  
  



  

    

Parse #uri into a [uri, option] pair.


  



  [ GitHub ]


  

  


# File 'lib/drb/drb.rb', line 893



def self.uri_option(uri, config)
  host, port, option = parse_uri(uri)
  return "druby://#{host}:#{port}", option
end


  







Instance Attribute Details



  

    #alive?  ⇒ Boolean  (readonly)
  



  

    

Check to see if this connection is alive.


  





  


  [ GitHub ]


  

  


# File 'lib/drb/drb.rb', line 1001



def alive?
  return false unless @socket
  if @socket.to_io.wait_readable(0)
    close
    return false
  end
  true
end


  








  

    #uri   (readonly)
  



  

    

Get the URI that we are connected to.


  



  [ GitHub ]


  

  


# File 'lib/drb/drb.rb', line 914



attr_reader :uri


  







Instance Method Details



  

    #accept  
  



  

    

On the server side, for an instance returned by #open_server, accept a client connection and return a new instance to handle the server’s side of this client-server session.


  



  [ GitHub ]


  

  


# File 'lib/drb/drb.rb', line 971



def accept
  while true
    s = accept_or_shutdown
    return nil unless s
    break if (@acl ? @acl.allow_socket?(s) : true)
    s.close
  end
  if @config[:tcp_original_host].to_s.size == 0
    uri = "druby://#{s.addr[3]}:#{@config[:tcp_port]}"
  else
    uri = @uri
  end
  self.class.new(uri, s, @config)
end


  








  

    #accept_or_shutdown   (private)
  

  [ GitHub ]


  

  


# File 'lib/drb/drb.rb', line 986



def accept_or_shutdown
  readables, = IO.select([@socket, @shutdown_pipe_r])
  if readables.include? @shutdown_pipe_r
    return nil
  end
  @socket.accept
end


  








  

    #close  
  



  

    

Close the connection.



If this is an instance returned by #open_server, then this stops listening for new connections altogether.  If this is an instance returned by #open or by #accept, then it closes this particular client-server session.


  



  [ GitHub ]


  

  


# File 'lib/drb/drb.rb', line 953



def close
  shutdown
  if @socket
    @socket.close
    @socket = nil
  end
  close_shutdown_pipe
end


  








  

    #close_shutdown_pipe   (private)
  

  [ GitHub ]


  

  


# File 'lib/drb/drb.rb', line 962



def close_shutdown_pipe
  @shutdown_pipe_w.close
  @shutdown_pipe_r.close
end


  








  

    #peeraddr  
  



  

    

Get the address of our TCP peer (the other end of the socket we are bound to.


  



  [ GitHub ]


  

  


# File 'lib/drb/drb.rb', line 918



def peeraddr
  @socket.peeraddr
end


  








  

    #recv_reply  
  



  

    

On the client side, receive a reply from the server.


  



  [ GitHub ]


  

  


# File 'lib/drb/drb.rb', line 941



def recv_reply
  @msg.recv_reply(stream)
end


  








  

    #recv_request  
  



  

    

On the server side, receive a request from the client.


  



  [ GitHub ]


  

  


# File 'lib/drb/drb.rb', line 931



def recv_request
  @msg.recv_request(stream)
end


  








  

    #send_reply(succ, result)  
  



  

    

On the server side, send a reply to the client.


  



  [ GitHub ]


  

  


# File 'lib/drb/drb.rb', line 936



def send_reply(succ, result)
  @msg.send_reply(stream, succ, result)
end


  








  

    #send_request(ref, msg_id, arg, b)  
  



  

    

On the client side, send a request to the server.


  



  [ GitHub ]


  

  


# File 'lib/drb/drb.rb', line 926



def send_request(ref, msg_id, arg, b)
  @msg.send_request(stream, ref, msg_id, arg, b)
end


  








  

    #set_sockopt(soc)  
  

  [ GitHub ]


  

  


# File 'lib/drb/drb.rb', line 1010



def set_sockopt(soc) # :nodoc:
  soc.setsockopt(Socket::IPPROTO_TCP, Socket::TCP_NODELAY, 1)
rescue IOError, Errno::ECONNRESET, Errno::EINVAL
  # closed/shutdown socket, ignore error
end


  








  

    #shutdown  
  



  

    

Graceful shutdown


  



  [ GitHub ]


  

  


# File 'lib/drb/drb.rb', line 996



def shutdown
  @shutdown_pipe_w.close
end


  








  

    #stream  
  



  

    

Get the socket.


  



  [ GitHub ]


  

  


# File 'lib/drb/drb.rb', line 923



def stream; @socket; end