Class: WEBrick::AsyncHTTPProxyServer

Inherits:
HTTPProxyServer
  • Object
show all
Defined in:
lib/jscmd/asynchttpproxy.rb

Direct Known Subclasses

JSCommander::ProxyServer

Defined Under Namespace

Classes: QueueInput

Instance Method Summary collapse

Instance Method Details

#proxy_service(req, res) ⇒ Object 



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# File 'lib/jscmd/asynchttpproxy.rb', line 26

def proxy_service(req, res)
  # Proxy Authentication
  proxy_auth(req, res)      
  
  # Create Request-URI to send to the origin server
  uri  = req.request_uri
  path = uri.path.dup
  path << "?" << uri.query if uri.query
  
  # Choose header fields to transfer
  header = Hash.new
  choose_header(req, header)
  set_via(header)
  
  # select upstream proxy server
  if proxy = proxy_uri(req, res)
    proxy_host = proxy.host
    proxy_port = proxy.port
    if proxy.userinfo
      credentials = "Basic " + [proxy.userinfo].pack("m*")
      credentials.chomp!
      header['proxy-authorization'] = credentials
    end
  end
  

  response = nil
  q = Queue.new
  data_queue = Queue.new
  # p_reader, p_writer = IO.pipe
  thread = Thread.start do
    begin
      @logger.debug "downloading #{uri}"
      http = Net::HTTP.new(uri.host, uri.port, proxy_host, proxy_port)
      http.start{
        if @config[:ProxyTimeout]
          ##################################   these issues are 
          http.open_timeout = 30   # secs  #   necessary (maybe bacause
          http.read_timeout = 60   # secs  #   Ruby's bug, but why?)
          ##################################
        end
        http_req = nil
        http_req_body = nil
        case req.request_method
        when "GET"
          http_req = Net::HTTP::Get.new(path, header)
        when "POST"
          http_req = Net::HTTP::Post.new(path, header)
          http_req_body = req.body || ""
        when "HEAD"
          http_req = Net::HTTP::Head.new(path, header)
        else
          raise HTTPStatus::MethodNotAllowed,
          "unsupported method `#{req.request_method}'."
        end
        http.request(http_req, http_req_body) do |response|
          q.push response
          size = 0
          last_size = 0
          response.read_body do |str|
            last_size = size
            size += str.size
            if last_size / 500000 != size / 500000
              @logger.debug "downloading #{uri}: size=#{size}"
            end
            # p_writer.write str
            data_queue.push str
          end
          @logger.debug "finished downloading #{uri}: size=#{size}"
          # p_writer.close
          data_queue.push nil
        end
      }
    rescue Exception => err
      logger.debug("#{err.class}: #{err.message}")
      q.push err
      # raise HTTPStatus::ServiceUnavailable, err.message
    end
  end
  response = q.pop
  if response.is_a?(Exception)
    @logger.debug "failed to download #{uri}"
    raise HTTPStatus::ServiceUnavailable, response.message
  end
  
  # Persistent connction requirements are mysterious for me.
  # So I will close the connection in every response.
  res['proxy-connection'] = "close"
  res['connection'] = "close"
  
  # Convert Net::HTTP::HTTPResponse to WEBrick::HTTPProxy
  res.status = response.code.to_i
  choose_header(response, res)
  set_cookie(response, res)
  set_via(res)
  res.body = QueueInput.new(data_queue) # p_reader
  def res.flush_body
    if @body.is_a?(IO)
      begin
        str_body = @body.read
      ensure
        @body.close
      end
      @body = str_body
    end
    @body
  end
  
  @logger.debug "downloading #{uri}: content-length=#{res.header['content-length']}"
  
  # Process contents
  if handler = @config[:ProxyContentHandler]
    handler.call(req, res)
  end
end