ZendCon 2017 - Build a Bot Workshop - Async Primer
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The document outlines a workshop led by Adam Englander on building a bot using asynchronous programming in PHP. It covers the necessary tools, concurrent programming concepts, and the use of the amphp framework while demonstrating practical examples for interacting with the Twitter API. Additionally, it discusses various methodologies such as event loops versus fork/join parallelism and provides links to resources for further learning.
![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);](https://image.slidesharecdn.com/zendcon2017-buildabotworkshop-asyncprimer-171023020617/85/ZendCon-2017-Build-a-Bot-Workshop-Async-Primer-11-320.jpg)
![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();](https://image.slidesharecdn.com/zendcon2017-buildabotworkshop-asyncprimer-171023020617/85/ZendCon-2017-Build-a-Bot-Workshop-Async-Primer-13-320.jpg)
![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>");
});](https://image.slidesharecdn.com/zendcon2017-buildabotworkshop-asyncprimer-171023020617/85/ZendCon-2017-Build-a-Bot-Workshop-Async-Primer-15-320.jpg)
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ZendCon 2017 - Build a Bot Workshop - Async Primer
- 1. @adam_englander Build A Bot Workshop: Async Primer Adam Englander iovation
- 2. @adam_englander What You Will Need • 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 Will Discuss • Concurrent Programming • Asynchronous I/O • AMPHP Asynchronous Framework for PHP
- 4. @adam_englander What We Will Do 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 • Forking and 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 • Frees up 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 Async I/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 TA RT 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 P R 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 Event Loop • 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>"); });
- 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
- 19. @adam_englander • http://amphp.org/ • #amphp on Freenode IRC • http://blog.kelunik.com/ • https://dev.twitter.com/ • https://github.com/PeeHaa/AsyncTwitter • https://github.com/aenglander/amp-twitter-bot Resources