Game Servers in OTP

Transcript

1. Game Servers in OTP

2. @msch featurebranch.com

3. None
4. None
5. None
6. None

7. Architecture big-picture The Table-FSM Life of an in-game event Real

   world concerns BoldPoker <3 Elixir Lessons Learned & QA

8. HA keepalived haproxy active Erlang active Erlang standby Erlang standby

   PostgreSQL haproxy standby

9. Erlang active

10. OTP Apps :cardgame :storage :network :gameserver

11. :cardgame OTP APP {Table,9} {Table,8} {Table,7} {Table,6}

12. :network OTP APP WebSocket :cowboy Flash (TCP) :ranch

13. :storage OTP APP PSQLDBWorker TableIdSequence

14. :gameserver OTP APP {Player,1} {Player,2} {Player,3}

15. Architecture big-picture The Table-FSM Life of an in-game event Real

    world concerns BoldPoker <3 Elixir Lessons Learned & QA
16. None

17. DealCards Knocking DealCards Play Result idle playing

18. [ {DealCards, [cards_to_deal, :private]}, {Knocking, [5000]}, {DealCards, [cards_to_deal, :private]}, {Negotiation,

    []}, {Play, [contra_enabled: true]}, {Play, []}, {Play, []}, … {Play, []}, {Play, []}, {Result, []} ]

19. gen_fsm:send_event/2 -----> Module:StateName/2 gen_fsm:send_event/2 -----> Table.playing/2 {:next_state, next_state_name, new_state_data} !

    {:stop, reason, new_state_data}

20. DealCards Knocking DealCards Play Result idle playing

21. {:next_stage, new_stage_data, new_state_data} ! {:end_game, new_stage_data, new_state_data} ! Table.broadcast_event {:next_state,

    next_state_name, new_state_data} ! {:stop, reason, new_state_data} ! GenServer.reply Table.playing/2 -----> DealCards.playing/3

22. DealCards Knocking DealCards Play Result idle playing

23. Knocking DealCards Play Result idle playing

24. DealCards Play Result idle playing

25. Play Result idle playing {:game_event, …}

26. Play Result idle playing {:game_event, …}

27. Architecture big-picture The Table-FSM Life of an in-game event Real

    world concerns BoldPoker <3 Elixir Lessons Learned & QA

28. P1 P2 P3 P4 {Table,9} {Player,1}

29. P1 P2 P3 P4 {Table,9} {Player,1} Ports

30. P1 P2 P3 P4 {Table,9} {Player,1}

31. P1 P2 P3 P4 {Table,9} {Player,1} {:game_event, :must_play_card}

32. P1 {Table,9} {Player,1} {:game_event, …}

33. P1 {Table,9} {Player,1} { "type": "mustPlayCard" } {:game_event, :must_play_card} ProtocolJSON.write/1

34. P1 {Table,9} {Player,1}

35. P1 {Table,9} {Player,1} { "type": "playACard", "card": "XH" } {:game_event,

    {:play_card,{:ten,:hearts}} ProtocolJSON.parse/1

36. P1 {Table,9} {Player,1} {:game_event, …}

37. Architecture big-picture The Table-FSM Life of an in-game event Real

    world concerns BoldPoker <3 Elixir Lessons Learned & QA

38. P1 P2 P3 P4 {Table,9} {Player,1}

39. haproxy active Erlang active Erlang standby Erlang standby

40. haproxy active Erlang standby Erlang active Erlang standby

41. :rpc.multicall(GameServer, switch_active, [node()])

42. P1 P2 P3 P4 {Table,9} P5 P6 P7 old

43. P1 P2 P3 P4 {Table,9} P5 P6 P7 old

44. P1 P2 P3 P4 {Table,9} old

45. P1 P2 P3 P4 {Table,9} old new {TableMigrator,9}

46. P1 P2 P3 P4 {Table,9} old new {TableMigrator,9}

47. P1 P2 P3 P4 {Table,9} P5 P6 P7 old new

    {TableMigrator,9}

48. P1 P2 P3 P4 {Table,9} P5 P6 P7 old new

    {TableMigrator,9}

49. P1 P2 P3 P4 {Table,9} P5 P6 P7 old new

    {TableMigrator,9}

50. P1 P2 P3 P4 {Table,9} P5 P6 P7 old new

    {TableMigrator,9}

51. P1 P2 P3 P4 {Table,9} P5 P6 P7 old new

    ConnectionProxy {TableMigrator,9}

52. P1 P2 P3 P4 {Table,9} P5 P6 P7 old new

    {TableMigrator,9}

53. P1 P2 P3 P4 {Table,9} old new {TableMigrator,9}

54. None

55. DealCards Knocking DealCards Play Result idle playing

56. P1 P2 P3 P4 old new {TableMigrator,9} portable_state

57. P1 2 3 4 old new { portable_state portable_state %{table_id:

     9,      player_ids:  [1,2,3,4],      positions:  %{1  =>  3,                                2  =>  0,                                3  =>  1,                                4  =>  2},      modifications:  [:short_hand],      last_game_id:  123   }

58. P1 P2 P3 P4 old new {TableMigrator,9}

59. old new {TableMigrator,9}

60. old new {TableMigrator,9}

61. None
62. None

63. old new {TableMigrator,9}

64. old new {TableMigrator,9} P1

65. old new {TableMigrator,9} P2 P3 P4 P1

66. old new {TableMigrator,9} P2 P3 P4 P1 portable_state

67. old new P2 P3 P4 P1 {Table,9}

68. None

69. P2 P3 P4 P1 {Table,9}

70. Architecture big-picture The Table-FSM Life of an in-game event Real

    world concerns BoldPoker <3 Elixir Lessons Learned & QA

71. All-in! Elixir Rewrite

72. Why? Extensibility goals stdlib mix ExUnit

73. :gen_fsm :ets GenServer Supervisor alias :ets, as: ETS

74. proper Tests send_events(ClientDeviceIDs, ClientIP) -> ?FORALL(Event, event(), ?FORALL(Data, event_data(Event), ...

75. parse_transform ?

76. Architecture big-picture The Table-FSM Life of an in-game event Moving

    tables across servers BoldPoker <3 Elixir Lessons Learned & QA

77. Perform en/decoding at the system border P1 { "type": "playACard",

    "card": "XH" } {:game_event, {:play_card,{:ten,:hearts}} ProtocolJSON.parse/1 WS

78. Create your own behaviours for fun better reusability and profit

    easier testing {:next_stage, new_stage_data, new_state_data} {:end_game, new_stage_data, new_state_data}

79. Distributed Erlang makes hard things easy ConnectionProxy

80. DB failure? We got all data already, so finish the

    game, then just store result on disk

81. Thank you! @msch featurebranch.com