Class: Sip2::NonBlockingSocket

Inherits:
Object
  • Object
show all
Defined in:
lib/sip2/non_blocking_socket.rb

Overview

Sip2 Non-blocking socket From spin.atomicobject.com/2013/09/30/socket-connection-timeout-ruby/

Class Method Summary collapse

Class Method Details

.connect(host, port, timeout = 5) ⇒ Object

rubocop:disable Metrics/AbcSize, Metrics/MethodLength



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# File 'lib/sip2/non_blocking_socket.rb', line 10

def self.connect(host, port, timeout = 5)
  # Convert the passed host into structures the non-blocking calls can deal with
  addr = Socket.getaddrinfo(host, nil)
  sockaddr = Socket.pack_sockaddr_in(port, addr[0][3])

  Socket.new(Socket.const_get(addr[0][0]), Socket::SOCK_STREAM, 0).tap do |socket|
    socket.setsockopt(Socket::IPPROTO_TCP, Socket::TCP_NODELAY, 1)

    begin
      # Initiate the socket connection in the background. If it doesn't fail
      # immediately it will raise an IO::WaitWritable (Errno::EINPROGRESS)
      # indicating the connection is in progress.
      socket.connect_nonblock(sockaddr)
    rescue IO::WaitWritable
      # IO.select will block until the socket is writable or the timeout
      # is exceeded - whichever comes first.
      if IO.select(nil, [socket], nil, timeout)
        begin
          # Verify there is now a good connection
          socket.connect_nonblock(sockaddr)
        rescue Errno::EISCONN # rubocop:disable Lint/HandleExceptions
          # Good news everybody, the socket is connected!
        rescue
          # An unexpected exception was raised - the connection is no good.
          socket.close
          raise
        end
      else
        # IO.select returns nil when the socket is not ready before timeout
        # seconds have elapsed
        socket.close
        raise 'Connection timeout'
      end
    end
  end
end