Class: RactorDNS::Server

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(authority:, cpu_count:, zones:, port: 8053) ⇒ Server

Returns a new instance of Server.



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

def initialize(authority:, cpu_count:, zones:, port: 8053)
  @authority = authority
  @cpu_count = cpu_count
  @zones = ZoneCollection.new(zones)
  @port = port
  @started = false
  @threads = []
end

Instance Attribute Details

#authority ⇒ Object (readonly)

Returns the value of attribute authority.



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# File 'lib/ractor_dns/server.rb', line 3

def authority
  @authority
end

#cpu_count ⇒ Object (readonly)

Returns the value of attribute cpu_count.



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# File 'lib/ractor_dns/server.rb', line 3

def cpu_count
  @cpu_count
end

#port ⇒ Object (readonly)

Returns the value of attribute port.



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# File 'lib/ractor_dns/server.rb', line 3

def port
  @port
end

#ractor ⇒ Object (readonly)

Returns the value of attribute ractor.



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# File 'lib/ractor_dns/server.rb', line 3

def ractor
  @ractor
end

#started ⇒ Object (readonly)

Returns the value of attribute started.



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# File 'lib/ractor_dns/server.rb', line 3

def started
  @started
end

#zones ⇒ Object (readonly)

Returns the value of attribute zones.



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# File 'lib/ractor_dns/server.rb', line 3

def zones
  @zones
end

Instance Method Details

#start(here = false) ⇒ Object 



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# File 'lib/ractor_dns/server.rb', line 14

def start(here = false)
  return if @started
  @pipe = Ractor.new do
    loop do
      recv = Ractor.recv
      if recv == :stop
        Ractor.yield([recv, nil, nil])
        Ractor.current.close_incoming
        Ractor.current.close_outgoing
        break
      end
      Ractor.yield(recv)
    end
  end

  @resolvers = (@cpu_count ^ 2).times.map do
    Ractor.new(@pipe, @authority) do |pipe, authority|
      loop do
        data, zone_h = Ractor.recv

        break if data == :stop && zone_h.nil?

        decoded = RRs::Message.decode(data)

        response = RRs::Message.new(decoded.id)
        response.add_authority(*authority)
        response.instance_exec(decoded) do |decoded|
          @question.concat(decoded.question)
        end
        decoded.question.each do |q|
          (zone_h.search(q[0]) || []).filter { |el|
            el[:rr].class == q[1] && el[:name] == q[0].to_s
          }&.each do |ans|
            response.add_answer(ans[:name], ans[:ttl], ans[:rr])
          end
        end

        Ractor.yield(response.encode)
      end
    end
  end
  
  @zones.start
  
  if here
    
    start_main_loop
  else
    @threads = @cpu_count.times.map do |i|
      Thread.new do
        start_main_loop
      end
    end
  end

  at_exit do
    stop
  end
  
  @started = true
end

#start_main_loop(i = rand([email protected])) ⇒ Object 



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# File 'lib/ractor_dns/server.rb', line 88

def start_main_loop(i = rand(0...@resolvers.length))
  Async do
    @cpu_count.times do
      Async::IO::Endpoint.udp('0.0.0.0', @port).bind do |socket|
        loop do
          data, address = socket.recvfrom(1024)
          @resolvers[i].send([data, @zones.freeze])
          encoded = @resolvers[i].take
          socket.send(encoded, 0, address)
        end
      end
    end
  end
end

#stop ⇒ Object 



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# File 'lib/ractor_dns/server.rb', line 76

def stop
  begin
    @threads.each do |t|
      t.kill
    end
    @pipe&.send(:stop)
    @zones&.stop
  rescue Ractor::ClosedError
    nil
  end
end