Class: Ferrum::Proxy::HTTPProxyServer

Inherits:
WEBrick::HTTPProxyServer
  • Object
show all
Defined in:
lib/ferrum/proxy.rb

Overview

Fix hanging proxy at exit

Instance Method Summary collapse

Instance Method Details

#do_CONNECT(req, res) ⇒ Object

rubocop:disable all

Raises:

  • (WEBrick::HTTPStatus::InternalServerError) 


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# File 'lib/ferrum/proxy.rb', line 112

def do_CONNECT(req, res)
  # Proxy Authentication
  proxy_auth(req, res)

  ua = Thread.current[:WEBrickSocket]  # User-Agent
  raise WEBrick::HTTPStatus::InternalServerError,
        "[BUG] cannot get socket" unless ua

  host, port = req.unparsed_uri.split(":", 2)
  # Proxy authentication for upstream proxy server
  if proxy = proxy_uri(req, res)
    proxy_request_line = "CONNECT #{host}:#{port} HTTP/1.0"
    if proxy.userinfo
      credentials = "Basic " + [proxy.userinfo].pack("m0")
    end
    host, port = proxy.host, proxy.port
  end

  begin
    @logger.debug("CONNECT: upstream proxy is `#{host}:#{port}'.")
    os = TCPSocket.new(host, port)     # origin server

    if proxy
      @logger.debug("CONNECT: sending a Request-Line")
      os << proxy_request_line << CRLF
      @logger.debug("CONNECT: > #{proxy_request_line}")
      if credentials
        @logger.debug("CONNECT: sending credentials")
        os << "Proxy-Authorization: " << credentials << CRLF
      end
      os << CRLF
      proxy_status_line = os.gets(LF)
      @logger.debug("CONNECT: read Status-Line from the upstream server")
      @logger.debug("CONNECT: < #{proxy_status_line}")
      if %r{^HTTP/\d+\.\d+\s+200\s*} =~ proxy_status_line
        while line = os.gets(LF)
          break if /\A(#{CRLF}|#{LF})\z/om =~ line
        end
      else
        raise WEBrick::HTTPStatus::BadGateway
      end
    end
    @logger.debug("CONNECT #{host}:#{port}: succeeded")
    res.status = WEBrick::HTTPStatus::RC_OK
  rescue => ex
    @logger.debug("CONNECT #{host}:#{port}: failed `#{ex.message}'")
    res.set_error(ex)
    raise WEBrick::HTTPStatus::EOFError
  ensure
    # At exit os variable sometimes can be nil which results in hanging forever
    raise WEBrick::HTTPStatus::EOFError unless os

    if handler = @config[:ProxyContentHandler]
      handler.call(req, res)
    end
    res.send_response(ua)
    access_log(@config, req, res)

    # Should clear request-line not to send the response twice.
    # see: HTTPServer#run
    req.parse(NullReader) rescue nil
  end

  begin
    while fds = IO::select([ua, os])
      if fds[0].member?(ua)
        buf = ua.readpartial(1024);
        @logger.debug("CONNECT: #{buf.bytesize} byte from User-Agent")
        os.write(buf)
      elsif fds[0].member?(os)
        buf = os.readpartial(1024);
        @logger.debug("CONNECT: #{buf.bytesize} byte from #{host}:#{port}")
        ua.write(buf)
      end
    end
  rescue
    os.close
    @logger.debug("CONNECT #{host}:#{port}: closed")
  end

  raise WEBrick::HTTPStatus::EOFError
end