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) ⇒ 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)
  @server = TCPServer.new(bind, port)
  @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 16

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

#dispatch_response(socket, response) ⇒ Object 



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# File 'lib/spyder/server.rb', line 96

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

  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
end

#process_new_client(socket) ⇒ Object 



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# File 'lib/spyder/server.rb', line 75

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 63

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 118

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 20

def start
  @server.listen(10)
  loop do
    client = @server.accept

    app_thread = Thread.new do
      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
    end

    over_capacity = true
    added_thread_to_list = false
    while over_capacity
      @tp_sync.synchronize do
        unless added_thread_to_list
          @threads << app_thread
          added_thread_to_list = true
        end
        over_capacity = (@threads.length >= @max_threads)
        # puts("#{@threads.length} of #{@max_threads}")

        @threads.delete_if { |t| !t.alive? }
      end

      # puts("XXX OVER CAPACITY!") if over_capacity
      sleep 0 if over_capacity
    end
  end
end