module CoreExtensions::TCPSocketExt::Initializer - rubygems: Ruby Standard Library Documentation

# module CoreExtensions::TCPSocketExt::Initializer

### Constants

CONNECTION_TIMEOUT
IPV4_DELAY_SECONDS

### Public Class Methods

new(host, serv, *rest) click to toggle source
Calls superclass method

    # File rubygems/core_ext/tcpsocket_init.rb, line 15
    def initialize(host, serv, *rest)
      mutex = Thread::Mutex.new
      addrs = []
      threads = []
      cond_var = Thread::ConditionVariable.new

      Addrinfo.foreach(host, serv, nil, :STREAM) do |addr|
        Thread.report_on_exception = false

        threads << Thread.new(addr) do
          # give head start to ipv6 addresses
          sleep IPV4_DELAY_SECONDS if addr.ipv4?

          # raises Errno::ECONNREFUSED when ip:port is unreachable
          Socket.tcp(addr.ip_address, serv, connect_timeout: CONNECTION_TIMEOUT).close
          mutex.synchronize do
            addrs << addr.ip_address
            cond_var.signal
          end
        end
      end

      mutex.synchronize do
        timeout_time = CONNECTION_TIMEOUT + Time.now.to_f
        while addrs.empty? && (remaining_time = timeout_time - Time.now.to_f) > 0
          cond_var.wait(mutex, remaining_time)
        end

        host = addrs.shift unless addrs.empty?
      end

      threads.each {|t| t.kill.join if t.alive? }

      super(host, serv, *rest)
    end