Class: Spyder::Server

Inherits:
Object
  • Object
show all
Defined in:
lib/spyder/server.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(bind, port, router: Router.new, max_threads: 4, tcp_backlog: 10) ⇒ Server

Returns a new instance of Server.



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# File 'lib/spyder/server.rb', line 7

def initialize(bind, port, router: Router.new, max_threads: 4, tcp_backlog: 10)
  @server = TCPServer.new(bind, port)
  @tcp_backlog = tcp_backlog
  @max_threads = max_threads
  @middleware = []
  @threads = []
  @tp_sync = Mutex.new
  @router = router
end

Instance Attribute Details

#router ⇒ Object

Returns the value of attribute router.



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# File 'lib/spyder/server.rb', line 5

def router
  @router
end

Instance Method Details

#add_middleware(callable, args) ⇒ Object 



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# File 'lib/spyder/server.rb', line 17

def add_middleware(callable, args)
  @middleware << [callable, args]
end

#dispatch_response(socket, response) ⇒ Object 



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# File 'lib/spyder/server.rb', line 98

def dispatch_response(socket, response)
  content_length = response.headers.dict['content-length']
  if !content_length && response.body && response.body.is_a?(String)
    content_length = response.body.length
  end

  begin
    socket.write("HTTP/1.1 #{response.code} #{response.reason_sentence.b}\r\n")
    response.headers.ordered.each do |name, value|
      socket.write("#{name.b}: #{value.b}\r\n")
    end
    socket.write("connection: close\r\n") # FIXME:
    socket.write("content-length: #{content_length}\r\n") if content_length
    socket.write("\r\n")

    if response.body
      Array(response.body).each do |part|
        content = part.respond_to?(:call) ? part.call : part
        socket.write(content.b)
      end
    end
  rescue Errno::EPIPE
    # socket closed. So what?
    socket.close rescue nil
  end
end

#process_new_client(socket) ⇒ Object 



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# File 'lib/spyder/server.rb', line 77

def process_new_client(socket)
  verb, path, protocol = read_line(socket).split(' ')
  request = Request.new
  request.path = path
  request.verb = verb
  request.io = socket

  loop do
    line = read_line(socket)
    break if line == ''
    sep = line.index(':')
    name = line[0...sep].downcase
    value = line[(sep + 2)..]
    request.add_header(name, value)
  end

  response = process_request(request)

  dispatch_response(socket, response)
end

#process_request(request) ⇒ Object 



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# File 'lib/spyder/server.rb', line 65

def process_request(request)
  mids = @middleware + [[RouterApp, @router]]
  app = nil
  loop do
    klass, args = mids.pop
    break unless klass
    app = klass.new(args, app)
  end

  app.call({}, request)
end

#read_line(socket) ⇒ Object 



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# File 'lib/spyder/server.rb', line 125

def read_line(socket)
  line_limit = 1024 * 16
  buffer = String.new(capacity: 128)
  almost = false
  loop do
    line_limit -= 1
    return false unless line_limit > 0

    c = socket.readchar
    if !almost && c == "\r"
      almost = true
    elsif almost
      return false unless c == "\n"
      return buffer
    else
      buffer += c
    end
  end
end

#start ⇒ Object 



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# File 'lib/spyder/server.rb', line 21

def start
  busy_threads = 0
  @server.listen(@tcp_backlog)

  loop do
    time_start = Process.clock_gettime(:CLOCK_MONOTONIC, :float_second)
    loop do
      current_busy = @tp_sync.synchronize { busy_threads }
      break if current_busy < @max_threads
      sleep(0)
      current_time = Process.clock_gettime(:CLOCK_MONOTONIC, :float_second)
      if (current_time - time_start) > 1.0
        # puts "Waiting a long time: #{(current_time - time_start)}"
        sleep 0.2
      end
    end

    client = @server.accept
    @tp_sync.synchronize { busy_threads += 1 }

    Thread.new do
      begin
        error = nil
        begin
          process_new_client(client)
        rescue Exception => e
          error = e
        end

        if error
          puts error.full_message

          response = Response.make_generic :internal_server_error
          dispatch_response(client, response)
        end

        client.close rescue nil
      ensure
        @tp_sync.synchronize { busy_threads -= 1 }
      end
    end
  end
end