Class: DRb::DRbTCPSocket

Inherits:
Object
  • Object
show all
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.

Direct Known Subclasses

DRbSSLSocket, DRbUNIXSocket

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(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. config is our configuration.



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# File 'lib/drb/drb.rb', line 902

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

Instance Attribute Details

#uri ⇒ Object (readonly)

Get the URI that we are connected to.



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# File 'lib/drb/drb.rb', line 913

def uri
  @uri
end

Class Method Details

.getservername ⇒ Object

Returns the hostname of this server



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# File 'lib/drb/drb.rb', line 844

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) ⇒ Object

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

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



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# File 'lib/drb/drb.rb', line 837

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) ⇒ Object

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



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# File 'lib/drb/drb.rb', line 875

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) ⇒ Object

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.



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# File 'lib/drb/drb.rb', line 860

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

.uri_option(uri, config) ⇒ Object

Parse uri into a [uri, option] pair.



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# File 'lib/drb/drb.rb', line 892

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

Instance Method Details

#accept ⇒ Object

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.



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# File 'lib/drb/drb.rb', line 970

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

#alive? ⇒ Boolean

Check to see if this connection is alive.

Returns:

  • (Boolean) 


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# File 'lib/drb/drb.rb', line 1000

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

#close ⇒ Object

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.



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# File 'lib/drb/drb.rb', line 952

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

#peeraddr ⇒ Object

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



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# File 'lib/drb/drb.rb', line 917

def peeraddr
  @socket.peeraddr
end

#recv_reply ⇒ Object

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



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# File 'lib/drb/drb.rb', line 940

def recv_reply
  @msg.recv_reply(stream)
end

#recv_request ⇒ Object

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



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# File 'lib/drb/drb.rb', line 930

def recv_request
  @msg.recv_request(stream)
end

#send_reply(succ, result) ⇒ Object

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



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# File 'lib/drb/drb.rb', line 935

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

#send_request(ref, msg_id, arg, b) ⇒ Object

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



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# File 'lib/drb/drb.rb', line 925

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

#set_sockopt(soc) ⇒ Object

:nodoc:



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# File 'lib/drb/drb.rb', line 1009

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 ⇒ Object

Graceful shutdown



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# File 'lib/drb/drb.rb', line 995

def shutdown
  @shutdown_pipe_w.close
end

#stream ⇒ Object

Get the socket.



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# File 'lib/drb/drb.rb', line 922

def stream; @socket; end