Class: Dist::Server

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Encoding

#send_string

Constructor Details

#initialize(port) ⇒ Server

Returns a new instance of Server.



16
17
18
19
 
# File 'lib/server.rb', line 16

def initialize(port)
  @server = TCPServer.new(port)
  @roles = Dir[File.join(File.dirname(__FILE__), '..', 'roles', '*')].map { |p| p.split('/').last }.inject({}) { |o,f| o[f] = Set.new; o }
end

Instance Attribute Details

#roles ⇒ Object (readonly)

Returns the value of attribute roles.



21
22
23
 
# File 'lib/server.rb', line 21

def roles
  @roles
end

Instance Method Details

#disconnect_ip(ip) ⇒ Object 



23
24
25
26
27
28
29
30
 
# File 'lib/server.rb', line 23

def disconnect_ip(ip)
  @roles.each do |role,sockets|
    sockets.select { |sock| sock.remote_ip == ip }.each do |sock|
      sockets.delete(sock)
      sock.close
    end
  end
end

#listen ⇒ Object 



32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
 
# File 'lib/server.rb', line 32

def listen
  puts 'Listening...'

  while (tcp_session = @server.accept)
    
    remote_ip = tcp_session.remote_ip
    disconnect_ip remote_ip

    Thread.new do
      puts "Client connected: #{tcp_session.peeraddr.inspect}"
      
      role = next_role

      begin
        receive_message tcp_session, Messages::REQUEST_ROLE
        
        tcp_session << Messages::SEND_ROLE_CONFIRM
        send_string tcp_session, role
        
        receive_message tcp_session, Messages::CONFIRM_ROLE
        confirmed_role = receive_string(tcp_session)
        
        if confirmed_role == role
          puts 'Role confirmation complete. Putting client into production.'
          @roles[role] << tcp_session
        else
          puts 'Role client sent back did not match role server sent... disconnecting client.'
          tcp_session.close rescue nil
        end
      rescue UnexpectedMessage
        puts 'Unexpected message... disconnecting client.'
        tcp_session.close rescue nil
      end

      p @roles
      
      begin
        while true
          sleep 3
          tcp_session << Messages::REQUEST_HEARTBEAT
          if tcp_session.ready_to_read?(5)
            receive_message tcp_session, Messages::HEARTBEAT
            #puts "#{remote_ip} - #{role}: Heartbeat"
          else
            puts "#{remote_ip} - #{role}: Timeout"
            break
          end
        end
      rescue => e
        puts "#{remote_ip} - #{role}: #{e.message}"
        puts "#{remote_ip} - #{role}: Dead"
      ensure
        tcp_session.close rescue nil
        @roles[role].delete(tcp_session)
      end
    end
  end
end

#next_role ⇒ Object 



91
92
93
 
# File 'lib/server.rb', line 91

def next_role
  @roles.keys.rand.min { |a,b| @roles[a].size <=> @roles[b].size }
end

#receive_message(session, expected_message = nil) ⇒ Object

Raises:



95
96
97
98
 
# File 'lib/server.rb', line 95

def receive_message(session, expected_message=nil)
  message = session.recvfrom(1).first
  raise UnexpectedMessage if expected_message && expected_message != message
end

#receive_string(session) ⇒ Object 



100
101
102
103
104
 
# File 'lib/server.rb', line 100

def receive_string(session)
  length = session.recvfrom(2).first.unpack('n')[0]
  return '' if length < 1
  return session.recvfrom(length).first
end