Module: Yahns::SocketHelper

Included in:
Server
Defined in:
lib/yahns/socket_helper.rb

Overview

Copyright © 2013, Eric Wong <[email protected]> and all contributors License: GPLv3 or later (www.gnu.org/licenses/gpl-3.0.txt) this is only meant for Yahns::Server

Instance Method Summary collapse

Instance Method Details

#bind_listen(address, opt) ⇒ Object

creates a new server, socket. address may be a HOST:PORT or an absolute path to a UNIX socket. address can even be a Socket object in which case it is immediately returned



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# File 'lib/yahns/socket_helper.rb', line 51

def bind_listen(address, opt)
  return address unless String === address
  opt ||= {}

  sock = if address[0] == ?/
    if File.exist?(address)
      if File.socket?(address)
        begin
          UNIXSocket.new(address).close
          # fall through, try to bind(2) and fail with EADDRINUSE
          # (or succeed from a small race condition we can't sanely avoid).
        rescue Errno::ECONNREFUSED
          @logger.info "unlinking existing socket=#{address}"
          File.unlink(address)
        end
      else
        raise ArgumentError,
              "socket=#{address} specified but it is not a socket!"
      end
    end
    old_umask = File.umask(opt[:umask] || 0)
    begin
      Yahns::UNIXServer.new(address)
    ensure
      File.umask(old_umask)
    end
  elsif /\A\[([a-fA-F0-9:]+)\]:(\d+)\z/ =~ address
    new_tcp_server($1, $2.to_i, opt.merge(ipv6: true))
  elsif /\A(\d+\.\d+\.\d+\.\d+):(\d+)\z/ =~ address
    new_tcp_server($1, $2.to_i, opt)
  else
    raise ArgumentError, "Don't know how to bind: #{address}"
  end
  set_server_sockopt(sock, opt)
  sock
end

#log_buffer_sizes(sock, pfx = '') ⇒ Object 



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# File 'lib/yahns/socket_helper.rb', line 41

def log_buffer_sizes(sock, pfx = '')
  rcvbuf = sock.getsockopt(:SOL_SOCKET, :SO_RCVBUF).int
  sndbuf = sock.getsockopt(:SOL_SOCKET, :SO_SNDBUF).int
  @logger.info("#{pfx}#{sock_name(sock)} rcvbuf=#{rcvbuf} sndbuf=#{sndbuf}")
rescue # TODO: get this fixed in rbx
end

#new_tcp_server(addr, port, opt) ⇒ Object 



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# File 'lib/yahns/socket_helper.rb', line 88

def new_tcp_server(addr, port, opt)
  sock = Socket.new(opt[:ipv6] ? :INET6 : :INET, :STREAM, 0)
  if opt.key?(:ipv6only)
    sock.setsockopt(:IPPROTO_IPV6, :IPV6_V6ONLY, opt[:ipv6only] ? 1 : 0)
  end
  sock.setsockopt(:SOL_SOCKET, :SO_REUSEADDR, 1)

  begin
    sock.setsockopt(:SOL_SOCKET, so_reuseport, 1)
  rescue => e
    name = sock_name(sock)
    @logger.warn("failed to set SO_REUSEPORT on #{name}: #{e.message}")
  end if opt[:reuseport]

  sock.bind(Socket.pack_sockaddr_in(port, addr))
  sock.autoclose = false
  Yahns::TCPServer.for_fd(sock.fileno)
end

#server_cast(sock) ⇒ Object

casts a given Socket to be a TCPServer or UNIXServer



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# File 'lib/yahns/socket_helper.rb', line 135

def server_cast(sock)
  sock.autoclose = false
  begin
    Socket.unpack_sockaddr_in(sock.getsockname)
    Yahns::TCPServer.for_fd(sock.fileno)
  rescue ArgumentError
    Yahns::UNIXServer.for_fd(sock.fileno)
  end
end

#set_server_sockopt(sock, opt) ⇒ Object 



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# File 'lib/yahns/socket_helper.rb', line 22

def set_server_sockopt(sock, opt)
  opt = {backlog: 1024}.merge!(opt || {})
  sock.close_on_exec = true

  TCPSocket === sock and sock.setsockopt(:IPPROTO_TCP, :TCP_NODELAY, 1)
  sock.setsockopt(:SOL_SOCKET, :SO_KEEPALIVE, 1)

  if opt[:rcvbuf] || opt[:sndbuf]
    log_buffer_sizes(sock, "before: ")
    { SO_RCVBUF: :rcvbuf, SO_SNDBUF: :sndbuf }.each do |optname,cfgname|
      val = opt[cfgname] and sock.setsockopt(:SOL_SOCKET, optname, val)
    end
    log_buffer_sizes(sock, " after: ")
  end
  sock.listen(opt[:backlog])
rescue => e
  Yahns::Log.exception(@logger, "#{sock_name(sock)} #{opt.inspect}", e)
end

#so_reuseport ⇒ Object

Linux got SO_REUSEPORT in 3.9, BSDs have had it for ages



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# File 'lib/yahns/socket_helper.rb', line 8

def so_reuseport
  if defined?(Socket::SO_REUSEPORT)
    Socket::SO_REUSEPORT
  elsif RUBY_PLATFORM =~ /linux/
    if RUBY_PLATFORM =~ /(?:alpha|mips|parisc|sparc)/
      0x0200 # untested
    else
      15 # only tested on x86_64 and i686
    end
  else
    nil
  end
end

#sock_name(sock) ⇒ Object

Returns the configuration name of a socket as a string. sock may be a string value, in which case it is returned as-is Warning: TCP sockets may not always return the name given to it.



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# File 'lib/yahns/socket_helper.rb', line 116

def sock_name(sock)
  case sock
  when String then sock
  when UNIXServer
    Socket.unpack_sockaddr_un(sock.getsockname)
  when TCPServer
    tcp_name(sock)
  when Socket
    begin
      tcp_name(sock)
    rescue ArgumentError
      Socket.unpack_sockaddr_un(sock.getsockname)
    end
  else
    raise ArgumentError, "Unhandled class #{sock.class}: #{sock.inspect}"
  end
end

#tcp_name(sock) ⇒ Object

returns rfc2732-style (e.g. “[::1]:666”) addresses for IPv6



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# File 'lib/yahns/socket_helper.rb', line 108

def tcp_name(sock)
  port, addr = Socket.unpack_sockaddr_in(sock.getsockname)
  /:/ =~ addr ? "[#{addr}]:#{port}" : "#{addr}:#{port}"
end