ZendCon 2017 - Build a Bot Workshop - Async Primer

ZendCon 2017 - Build a Bot Workshop - Async Primer

• 1.
  @adam_englander Build A BotWorkshop: Async Primer Adam Englander iovation
• 2.
  @adam_englander What You WillNeed • PHP 7.0, or 7.1 (Examples will be 7.1) • intl extension • Twitter account • Twitter Developer App: https://apps.twitter.com • OAuth Credentials: https://dev.twitter.com/oauth/ overview/application-owner-access-tokens
• 3.
  @adam_englander What We WillDiscuss • Concurrent Programming • Asynchronous I/O • AMPHP Asynchronous Framework for PHP
• 4.
  @adam_englander What We WillDo 1. We will use an asynchronous HTTP client to execute a Twitter REST API command. 2. We will use an asynchronous HTTP client to process a continuous stream via the Twitter User Stream API. 3. We will leverage both of the above to listen to a topic and automatically respond to updates.
• 5.
  @adam_englander Concurrent Programming • Forkingand Threading • Asynchronous I/O • Fork/Join • Event Loop Strategies Methodologies
• 6.
  @adam_englander Forking and Threading •Available in PHP core since PHP 4.1 • Requires the use of shared memory • Requires code to be written for management of forks/threads • Creates separate copies of code for each thread/fork
• 7.
  @adam_englander Asynchronous I/O • Freesup the current process while I/O is performed • Executes code based on I/O events • No copying of code for separate process
• 8.
  @adam_englander Asynchronous I/O Libraries •Streams via stream_select and socket_select • eio — libeio • ev — libev • libevent — libevent • event — libevent
• 9.
  @adam_englander Fork/Thread vs AsyncI/O • Compute heavy • Process isolation • Non-Async library • I/O processes • Process/memory optimization Fork/Thread Async I/O
• 10.
  @adam_englander Fork/Join Parallelism S TART P R O C E S S 1 P R O C E S S 2 P R O C E S S 3 E N DF O R K J O I N
• 11.
  Fork/Join Example $dispatcher =new AmpThreadDispatcher();
 $a = $dispatcher->call('slowProcess1');
 $b = $dispatcher->call('slowProcess2');
 $c = $dispatcher->call('slowProcess3');
 
 $comboPromise = Ampall([$a, $b, $c]);
 list($a, $b, $c) = Ampwait($comboPromise);
• 12.
  @adam_englander Event Loop Parallelism PR O C E S S Q U E U E I T E M Q U E U E I T E M I N Q U E U E ? X Yes No A S Y N C P R O C E S S A S Y N C P R O C E S S A S Y N C P R O C E S S A S Y N C P R O C E S S
• 13.
  Event Loop Example <?php
 #Build objects to handle asynchronous interaction
 $loop = ReactEventLoopFactory::create();
 $dnsFactory = new ReactDnsResolverFactory();
 $dns = $dnsFactory->createCached('8.8.8.8', $loop);
 $factory = new ReactHttpClientFactory();
 $client = $factory->create($loop, $dns);
 $resp = array(); # Create callback for handling response
 $responseHandler = function ($response) use ($resp) {
 $response->on( 'data', function ($data) use ($resp) {
 $resp[] = $data;
 });
 }; # Queue up requests to send
 $request = $client->request('GET', 'http://www.timeapi.org/utc/now');
 $request->on('response', $responseHandler);
 $request->end();
 
 $request = $client->request('GET', 'http://www.timeapi.org/utc/now');
 $request->on('response', $responseHandler);
 $request->end();
 
 # Run the loop
 $loop->run();
• 14.
  @adam_englander Fork/Join vs EventLoop • Enhance existing synchronous apps • Promises • Hack/HHVM • Non-HTTP apps • Full async apps • High volume apps Fork/Join Event Loop
• 15.
  Callbacks vs. Generators $stream= yield $apiClient->request($request);
 while (null !== $message = yield $stream->read()) {
 print($message[‘user’][‘screen_name’].": “.$message[‘text']);
 } Callback Generator Aerysrouter()
 ->get("/", function (AerysRequest $req, AerysResponse $resp) {
 $resp->end("<h1>Hello World!</h1>");
 })
 ->head("/", function (AerysRequest $req, AerysResponse $resp) {
 $resp->end("<h1>Hello Head!</h1>");
 });
• 16.
  @adam_englander AMPHP Asynchronous Framework forPHP
• 17.
  @adam_englander Complete Modern Framework •Modular framework segmented into logical parts • Supersedes icicle.io • Drivers for common storage engines • Can be used for event loop and fork/join • Can use threads or async i/o
• 18.
  @adam_englander Code Time!
• 19.
  @adam_englander • http://amphp.org/ • #amphpon Freenode IRC • http://blog.kelunik.com/ • https://dev.twitter.com/ • https://github.com/PeeHaa/AsyncTwitter • https://github.com/aenglander/amp-twitter-bot Resources
• 20.
  @adam_englander Please Rate Me https://joind.in/talk/e9da4