React.PHP

Transcript

1. React.PHP
2. K. k47.cz @kaja47 Karel Čížex funkcionalne.cz
3. http://reactphp.org/
4. There's nothing we cannot steal. Let's steal node.js
5. node.js? PHP? wat?
6. event driven, non-blocking, reactive, async IO
7. buzzword, buzzword, buzzword, buzzword
8. CPU je rychlé, IO je pomalé
9. L1 cache reference ......................... 0.5 ns Branch mispredict ............................ 5 ns L2 cache reference ........................... 7 ns Mutex lock/unlock ........................... 25 ns Main memory reference ...................... 100 ns Compress 1K bytes with Zippy ............. 3,000 ns = 3 µs Send 2K bytes over 1 Gbps network ....... 20,000 ns = 20 µs SSD random read ........................ 150,000 ns = 150 µs Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs Round trip within same datacenter ...... 500,000 ns = 0.5 ms Read 1 MB sequentially from SSD ...... 1,000,000 ns = 1 ms Disk seek ........................... 10,000,000 ns = 10 ms Read 1 MB sequentially from disk .... 20,000,000 ns = 20 ms Send packet CA->Netherlands->CA .... 150,000,000 ns = 150 ms
10. c10k
11. Na IO musíme čekat
12. Čekání blokuje vlákno
13. Potřebujeme hodně vláken
14. Vlákna zabírají paměť
15. 10k vláken zabere hodně paměti
16. c10M
17. async non-blocking = 1 vlákno
18. epoll
19. stream_select(&$readable, &$writable, &$exc, $timeout)
20. while (true) { ... stream_select($readable, $writable, $err, $timeout) ... }
21. >-(IO)->-(IO)---------------------->-(IO)---->-(CPU)->-(CPU)->-(CPU)-> >-(IO)->-(CPU)-> >-(IO)---------------------->-(CPU)-> >-(IO)----> -(CPU)->
22. Reaktivní aplikace WebSockets Async end-to-end Par { MySQL, Redis, HTTP, FS } Cron
23. React.PHP (gory details)
24. Http Socket Stream EventLoop
25. HttpClient | DNS | WebSocket | ZeroMQ Socket Stream EventLoop
26. $loop = React\EventLoop\Factory::create(); $socket = new React\Socket\Server($loop); $http = new React\Http\Server($socket, $loop); $http->on('request', function ($request, $response) { $response->writeHead(200, ['Content-Type' => 'text/plain']); $response->end("Hello World\n"); }); $socket->listen(1337); $loop->run();
27. Server napsaný v PHP, který běží v PHP procesu
28. Jednovláknový
29. $loop->addPeriodicTimer(60*60*24*7, function ($timer) { hideBodies(ALL_OF_THEM); });
30. http://autotweeter.k47.cz
31. In-memory
32. http://onlyoc.jdem.cz
33. worker --> DB <-- Apache worker ------------> React
34. [your ad here]
35. callbax: call(function ($a) { call(function ($b) use ($a) { call(function ($c) use ($a, $b) { throw new Exception('Where is your god now?'); }); }); });
36. callbax: $http->on('connect', function ($req, $resp) { $req->on('data', function ($postData) { parse_str($postData, $post); $users->getById($post['id'], function ($err, $user) { renderUser($user, $resp); }); } });
37. callback == continuation
38. Callback hell Composition Coordination
39. Promise!
40. Deferred / Resolved / Rejected
41. Promise = hodnota (FP) Callback = proces
42. Promise[IO]
43. ->then($ok, $err)
44. Callback hell Hodnota vs. proces
45. Kompozice $p->then($f)->then($g) (chyby) throw
46. // map (Functor) fetchPost($id)->then(function ($post) { return toJson($post, PRETTY); }); // flatMap (Monad) fetchPost($id)->then(function ($post) { return fetchPost($post->parentId); }); // robot unicorn attack loadFromCache()->then(null, 'loadFromDatabase')
47. $deferred = new React\Promise\Deferred(); $promise = $deferred->promise(); $resolver = $deferred->resolver(); $resolver->resolve('I\'m Boxxy you see') $resolver->reject(new \Exception('U dun goofed'));
48. React: Promise Resolver Scala: Future Promise C#: Task TaskCompletionSource
49. Koordinace
50. When::any($ps) When::some($ps, $n) When::all($ps) When::map($ps, $f) When::reduce($ps, $f) When::lazy($f)
51. $data = []; $callback = function($err, $val) use (&$data) { $data[] = $val; // pořadí? if (count($data) == 3) { realCallback($err, $data); } // chyby? chybějí! } fetch('ak', $callback); fetch('ruby', $callback); fetch('peo', $callback);
52. When::all(getUsers(), getCategories(), getLastPosts()); When::any(server(1), server(2), server(3)); When::all( When::map(getLastPost(), 'getComments'), getCategories(), getTweetsFromCache() ->then(null, 'fetchTweets') ->then('tranform', function () { return []; }) );
53. function timeout($time, $promise, $loop) { $defer = new React\Promise\Deferred; $r = $defer->resolver(); $sig = $loop->addTimer($time, function() use($r) { $r->reject('timeout'); }); $promise->then( function ($x) use($r, $sig, $loop) { $loop->cancelTimer($sig); $r->resolve($x); }, function ($e) use($r) { $r->reject($e); } ); return $defer->promise(); }
54. To je všechno pěkné, ale...
55. // fetch all followers $profile = fetchProfile('kaja47'); $ids = []; $cursor = '-1'; do { $fs = fetchFollowers($profile->id, $cursor); $ids = array_merge($ids, $fs->ids); $cursor = $fs->next_cursor_str; } while ($cursor != "0") return [$profile, $ids];
56. // async clusterfuck fetchProfile($userName)->then(function ($profile) { $fetch = function($userId, $cursor) use (&$fetch) { return fetchFollowers($userId, $cursor)->then(function ($fs) use ($userId) { $cursor = $fs->next_cursor_str; if ($cursor == "0") return When::resolve($fs->ids); else return $fetch($userId, $cursor)->then(function($ids) use($fs) { return array_merge($fs->ids, ids); }); }); }; $fetch($profile->id, '-1')->then(function($ids) use($ids) { return [$profile, $ids]; }) });
57. CPS
58. C# : async/await Iced Coffeescript: await/defer Scala: for/shift/reset/flow/makra
59. PHP 5.5 & yield
60. // async flow(function() { $profile = (yield fetchProfile('kaja47')); $ids = []; $cursor = '-1'; do { $fs = (yield fetchFollowers($profile->id, $cursor)); $ids = array_merge($ids, $fs->ids); $cursor = $fs->next_cursor_str; } while ($cursor != "0") yield [$profile, $ids]; });
61. function flow(Closure $f) { $gen = $f(); $fst = true; $recur = function($pureValue) use($gen, &$recur, &$fst) { $x = $fst ? $gen->current() : $gen->send($pureValue); $fst = false; if (!$gen->valid()) return $pureValue; if ($x instanceof Promise) return $x->then($recur); else return $recur($x); }; return $recur(null); }
62. [your ad here]
63. Co dál?
64. Reactive Nette
65. Async errything
66. FS HttpClient WebSocket Redis ZeroMQ STOMP (RabbitMQ) SOCKS IRC Dnode MySQL (non-reactive)
67. Výkon PHP < V8
68. Native async extension VM (JIT/tracing) GC Datové struktury
69. Rx Iteratees
70. popularita efektivita ⇒
71. This is the end Beautiful friend This is the end My only friend, the end Of our elaborate plans, the end Of everything that stands, the end No safety or surprise, the end I'll never look into your eyes...again Can you picture what will be So limitless and free Desperately in need...of some...stranger's hand In a...desperate land Lost in a Roman...wilderness of pain And all the children are insane All the children are insane Waiting for the summer rain, yeah
72. http://reactphp.org/ https://github.com/reactphp https://gist.github.com/hellerbarde/2843375 http://conference.phpnw.org.uk/phpnw12/schedule/igor-wiedler/#video http://blog.jcoglan.com/2013/03/30/callbacks-are-imperative-promises-are-fu nctional-nodes-biggest-missed-opportunity/ http://blog.jcoglan.com/2013/04/01/callbacks-promises-and-simplicity/ https://gist.github.com/domenic/3889970 http://blog.parse.com/2013/01/29/whats-so-great-about-javascript-promises/ http://brianmckenna.org/blog/category_theory_promisesaplus http://www.dartlang.org/articles/using-future-based-apis/ http://marakana.com/s/post/1453/redemption_from_callback_hell_michael_ja ckson_domenic_denicola_video https://github.com/kaja47/flow https://github.com/kaja47/async-mysql https://gist.github.com/kaja47/4407844
73. will-work-for-food@k47.cz