Module: Lich::Common::SocketConfigurator

Defined in:
documented/common/socketconfigurator.rb

Overview

Configures socket options for different platforms.

This module handles the configuration of socket options for both Windows and Unix-like systems.

Defined Under Namespace

Modules: WinFFI

Class Method Summary collapse

Class Method Details

.configure(sock, keepalive: { enable: true, idle: 120, interval: 30 }, linger: { enable: true, timeout: 5 }, timeout: { recv: 30, send: 30 }, buffer_size: { recv: 32768, send: 32768 }, tcp_nodelay: true, tcp_maxrt: 10) ⇒ void

This method returns an undefined value.

Configures the given socket with specified options.

Examples:

Configure a socket with custom settings

SocketConfigurator.configure(my_socket,
  keepalive: { enable: true, idle: 120, interval: 30 },
  linger: { enable: true, timeout: 5 },
  timeout: { recv: 30, send: 30 },
  buffer_size: { recv: 32768, send: 32768 },
  tcp_nodelay: true,
  tcp_maxrt: 10)

Parameters:

  • sock (Socket) —

    the socket to configure

  • keepalive (Hash) (defaults to: { enable: true, idle: 120, interval: 30 }) —

    options for TCP keepalive settings

  • linger (Hash) (defaults to: { enable: true, timeout: 5 }) —

    options for connection linger settings

  • timeout (Hash) (defaults to: { recv: 30, send: 30 }) —

    options for receive/send timeouts

  • buffer_size (Hash) (defaults to: { recv: 32768, send: 32768 }) —

    options for receive/send buffer sizes

  • tcp_nodelay (Boolean) (defaults to: true) —

    whether to disable Nagle's algorithm

  • tcp_maxrt (Integer) (defaults to: 10) —

    maximum retransmission time

Raises:

  • (StandardError) —

    if configuration fails



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# File 'documented/common/socketconfigurator.rb', line 119

def self.configure(sock,
                   keepalive: { enable: true, idle: 120, interval: 30 },
                   linger: { enable: true, timeout: 5 },
                   timeout: { recv: 30, send: 30 },
                   buffer_size: { recv: 32768, send: 32768 },
                   tcp_nodelay: true,
                   tcp_maxrt: 10)
  Lich.log("Configuring socket: keepalive=#{keepalive}, linger=#{linger}, timeout=#{timeout}, buffer_size=#{buffer_size}, tcp_nodelay=#{tcp_nodelay}, tcp_maxrt=#{tcp_maxrt}") if ARGV.include?("--debug")

  begin
    if Gem.win_platform?
      configure_windows(sock, keepalive, linger, timeout, buffer_size, tcp_nodelay, tcp_maxrt)
    else
      configure_unix(sock, keepalive, linger, timeout, buffer_size, tcp_nodelay)
    end
    Lich.log("Socket configuration successful") if ARGV.include?("--debug")
  rescue => e
    Lich.log("Socket configuration failed: #{e.class} - #{e.message}\n\t#{e.backtrace.join("\n\t")}") if ARGV.include?("--debug")
    raise
  end
end

.configure_unix(sock, keepalive, linger, timeout, buffer_size, tcp_nodelay) ⇒ void

This method returns an undefined value.

Configures socket options for Unix-like systems.

Parameters:

  • sock (Socket) —

    the socket to configure

  • keepalive (Hash) —

    options for TCP keepalive settings

  • linger (Hash) —

    options for connection linger settings

  • timeout (Hash) —

    options for receive/send timeouts

  • buffer_size (Hash) —

    options for receive/send buffer sizes

  • tcp_nodelay (Boolean) —

    whether to disable Nagle's algorithm

Raises:

  • (StandardError) —

    if configuration fails



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# File 'documented/common/socketconfigurator.rb', line 152

def self.configure_unix(sock, keepalive, linger, timeout, buffer_size, tcp_nodelay)
  # Helper: error-checked setsockopt
  check_setsockopt = lambda do |level, option, value|
    begin
      sock.setsockopt(level, option, value)
      Lich.log("Unix setsockopt succeeded: level=#{level}, option=#{option}") if ARGV.include?("--debug")
    rescue => e
      Lich.log("Unix setsockopt failed: level=#{level}, option=#{option}, error=#{e.message}") if ARGV.include?("--debug")
      raise
    end
  end

  # Keepalive
  if keepalive[:enable]
    check_setsockopt.call(Socket::SOL_SOCKET, Socket::SO_KEEPALIVE, [1].pack('i'))
    if Socket.const_defined?(:TCP_KEEPIDLE)
      check_setsockopt.call(Socket::IPPROTO_TCP, Socket::TCP_KEEPIDLE, [keepalive[:idle]].pack('i'))
    elsif Socket.const_defined?(:TCP_KEEPALIVE)
      check_setsockopt.call(Socket::IPPROTO_TCP, Socket::TCP_KEEPALIVE, [keepalive[:idle]].pack('i'))
    end
    check_setsockopt.call(Socket::IPPROTO_TCP, Socket::TCP_KEEPINTVL, [keepalive[:interval]].pack('i')) if Socket.const_defined?(:TCP_KEEPINTVL)
    check_setsockopt.call(Socket::IPPROTO_TCP, Socket::TCP_KEEPCNT, [5].pack('i')) if Socket.const_defined?(:TCP_KEEPCNT)
  end

  # Linger
  if linger
    linger_struct = [linger[:enable] ? 1 : 0, linger[:timeout]].pack("ii")
    check_setsockopt.call(Socket::SOL_SOCKET, Socket::SO_LINGER, linger_struct)
  end

  # Timeouts
  if timeout
    check_setsockopt.call(Socket::SOL_SOCKET, Socket::SO_RCVTIMEO, [timeout[:recv], 0].pack("l!l!"))
    check_setsockopt.call(Socket::SOL_SOCKET, Socket::SO_SNDTIMEO, [timeout[:send], 0].pack("l!l!"))
  end

  # Buffer sizes
  if buffer_size
    check_setsockopt.call(Socket::SOL_SOCKET, Socket::SO_RCVBUF, [buffer_size[:recv]].pack('i')) if buffer_size[:recv]
    check_setsockopt.call(Socket::SOL_SOCKET, Socket::SO_SNDBUF, [buffer_size[:send]].pack('i')) if buffer_size[:send]
  end

  # TCP_NODELAY
  check_setsockopt.call(Socket::IPPROTO_TCP, Socket::TCP_NODELAY, [1].pack('i')) if tcp_nodelay

  # TCP_USER_TIMEOUT (Linux only - how long to retry before giving up)
  if Socket.const_defined?(:TCP_USER_TIMEOUT)
    user_timeout_ms = 120000 # 120 seconds
    check_setsockopt.call(Socket::IPPROTO_TCP, Socket::TCP_USER_TIMEOUT, [user_timeout_ms].pack('i'))
  end
rescue => e
  Lich.log("Unix socket configuration error: #{e.class} - #{e.message}") if ARGV.include?("--debug")
  raise
end

.configure_windows(sock, keepalive, linger, timeout, buffer_size, tcp_nodelay, tcp_maxrt) ⇒ void

This method returns an undefined value.

Configures socket options for Windows systems.

Parameters:

  • sock (Socket) —

    the socket to configure

  • keepalive (Hash) —

    options for TCP keepalive settings

  • linger (Hash) —

    options for connection linger settings

  • timeout (Hash) —

    options for receive/send timeouts

  • buffer_size (Hash) —

    options for receive/send buffer sizes

  • tcp_nodelay (Boolean) —

    whether to disable Nagle's algorithm

  • tcp_maxrt (Integer) —

    maximum retransmission time

Raises:

  • (StandardError) —

    if configuration fails



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# File 'documented/common/socketconfigurator.rb', line 220

def self.configure_windows(sock, keepalive, linger, timeout, buffer_size, tcp_nodelay, tcp_maxrt)
  # Helper: error-checked setsockopt using Ruby's Socket API
  check_setsockopt = lambda do |level, option, value|
    begin
      sock.setsockopt(level, option, value)
      Lich.log("Windows setsockopt succeeded: level=#{level}, option=#{option}") if ARGV.include?("--debug")
    rescue => e
      Lich.log("Windows setsockopt failed: level=#{level}, option=#{option}, error=#{e.class}: #{e.message}") if ARGV.include?("--debug")
      raise SystemCallError.new("setsockopt(level=#{level}, option=#{option})", 0)
    end
  end

  # Keepalive - Step 1: Enable SO_KEEPALIVE using Ruby's API
  if keepalive[:enable]
    check_setsockopt.call(Socket::SOL_SOCKET, Socket::SO_KEEPALIVE, [1].pack('i'))

    # Step 2: Try to configure keep-alive parameters via WSAIoctl
    # This may fail on Ruby 3.x, so we'll catch and log but continue
    begin
      crt_fd = sock.fileno
      fd = WinFFI._get_osfhandle(crt_fd)

      if fd != -1
        ka = WinFFI::TcpKeepalive.new
        ka[:onoff] = 1
        ka[:keepalivetime] = keepalive[:idle] * 1000
        ka[:keepaliveinterval] = keepalive[:interval] * 1000
        bytes_returned = FFI::MemoryPointer.new(:ulong)

        ret = WinFFI.WSAIoctl(fd, WinFFI::SIO_KEEPALIVE_VALS, ka.to_ptr, ka.size,
                              nil, 0, bytes_returned, nil, nil)
        if ret == 0
          Lich.log("WSAIoctl keepalive configuration succeeded") if ARGV.include?("--debug")
        else
          errno = FFI.errno
          Lich.log("WSAIoctl keepalive failed (errno=#{errno}), using default Windows keepalive settings") if ARGV.include?("--debug")
        end
      else
        Lich.log("Could not get OS handle for WSAIoctl, using default Windows keepalive settings") if ARGV.include?("--debug")
      end
    rescue => e
      Lich.log("WSAIoctl keepalive configuration failed: #{e.class} - #{e.message}") if ARGV.include?("--debug")
      Lich.log("Continuing with basic keepalive enabled (default Windows settings)") if ARGV.include?("--debug")
    end
  end

  # Linger - using Ruby's Socket API
  if linger
    linger_bytes = [linger[:enable] ? 1 : 0, linger[:timeout]].pack('SS')
    check_setsockopt.call(Socket::SOL_SOCKET, Socket::SO_LINGER, linger_bytes)
  end

  # Timeouts - using Ruby's Socket API
  if timeout
    # Windows expects timeout in milliseconds as a DWORD (4 bytes)
    recv_timeout_ms = timeout[:recv] * 1000
    send_timeout_ms = timeout[:send] * 1000
    check_setsockopt.call(Socket::SOL_SOCKET, Socket::SO_RCVTIMEO, [recv_timeout_ms].pack('L'))
    check_setsockopt.call(Socket::SOL_SOCKET, Socket::SO_SNDTIMEO, [send_timeout_ms].pack('L'))
  end

  # Buffer sizes - using Ruby's Socket API
  if buffer_size
    check_setsockopt.call(Socket::SOL_SOCKET, Socket::SO_RCVBUF, [buffer_size[:recv]].pack('i')) if buffer_size[:recv]
    check_setsockopt.call(Socket::SOL_SOCKET, Socket::SO_SNDBUF, [buffer_size[:send]].pack('i')) if buffer_size[:send]
  end

  # TCP_NODELAY - using Ruby's Socket API
  if tcp_nodelay
    check_setsockopt.call(Socket::IPPROTO_TCP, Socket::TCP_NODELAY, [1].pack('i'))
  end

  # TCP_MAXRT - Windows-specific, may not be supported
  if tcp_maxrt
    begin
      # Try using Ruby's API first
      if defined?(Socket::TCP_MAXRT)
        check_setsockopt.call(Socket::IPPROTO_TCP, Socket::TCP_MAXRT, [tcp_maxrt].pack('i'))
      else
        Lich.log("TCP_MAXRT constant not available in Ruby's Socket API") if ARGV.include?("--debug")
      end
    rescue => e
      Lich.log("TCP_MAXRT not supported on this Windows version: #{e.message}") if ARGV.include?("--debug")
    end
  end

  Lich.log("Windows socket configuration completed successfully") if ARGV.include?("--debug")
rescue => e
  Lich.log("Windows socket configuration error: #{e.class} - #{e.message}") if ARGV.include?("--debug")
  raise
end