Module: CoreExtensions::TCPSocketExt::Initializer

Defined in:
lib/rubygems/core_ext/tcpsocket_init.rb

Constant Summary collapse

CONNECTION_TIMEOUT = 
5
IPV4_DELAY_SECONDS = 
0.1

Instance Method Summary collapse

Instance Method Details

#initialize(host, serv, *rest) ⇒ Object 



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# File 'lib/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