ReactPHP: practical intro

SymfonyCafe Kyiv 2015

ReactPHP: Practical Intro

Dennis Povshedny, freelance


Agenda

- Intro about myself and the task- ReactPHP- Using of ReactPHP- Questions / Demo

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About myself

Main tools: C++, PHP, LinuxPreferred area: troubleshooting, optimizations,proof-of-concept, tech leadingOpensource: Drupal

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Task: check of sitemap.xml

- Rapid check of large sitemap.xml- Check both local and remote sitemap- learn something new

- candidates: PHP, C++, Bash, ReactPHP, Go, Rust, ...

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- Reactor pattern- Event Driven- Non-blocking I/O- Pure PHP, small

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What is ReactPHP?


Projects based on ReactPHP

- Redis Client/Server- Asterisk Management- Munin- Async SQL client- … several more

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Reactor


Core sample: HTTP server

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Layers

- Event loop as a backbone- Low-level components: DNS resolver, timers/ticks, sockets, network client/server)- Middle level: HTTP Server/Clients- High: Promise, Stream

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Layers in practice

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$loop = React\EventLoop\Factory::create();$socket = new React\Socket\Server($loop);$http = new React\Http\Server($socket);

Higher


Timers, including periodic

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Event Loop Engines

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if (function_exists('event_base_new')) { return new LibEventLoop(); } else if (class_exists('libev\EventLoop')) { return new LibEvLoop; } else if (class_exists('EventBase')) { return new ExtEventLoop; }

Installing additional libraries is optional


More: Async I/O

System: LibEIO packageBinding: eio PECLGitHub: react/filesystem

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More: Promises

Proxy objects to store values for yet unknown results

Also known as Deferred, Yield and Futures in other languages

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- https://github.com/reactphp/react/wiki/Users :about 40 projects;- Can be evaluated as alternative when you need to create multithreaded app- Community- Unit tests

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Project state


Disadvantages

- version is 0.4.x- complicated to debug an application

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Part II - using of ReactPHP

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The Octopus project

An app which uses two featuresof the ReactPHP:- Async Http Requests;- Timers.

Purpose: education + simple tool needed to check sitemap validity

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Parallel execution of GET requests

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❖ ~70 ms per page vs ~300 ms for sequential check;❖ low memory and CPU usage


...can’t say the same for server :)

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Extract from settings file


Application main file

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- a few full days of development, initially with idea of rapid check of sitemap.xml before Google;

- about 12k of PHP code;- 1 accepted PR to ReactPHP;- works faster than script with sequential checking (6x);- application core was developed relatively easy;

Octopus facts and numbers

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Handlers: named function

Regular named function can be used as well

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OpenSource, Experimental

- code is more Proof-of-concept stype;- published on GitHub, welcome to fork and experiment

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Possible evolution & new tools

- Octopus: parse for links, check them as well- Other project: compare/warmup DNS servers

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Sum it up

Job is done.Used two components, there is many more:- Streams;- Child processes;- Futures (Promises)

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LinksSee those...http://reactphp.orghttp://blog.wyrihaximus.net/2015/01/reactphp-introductionhttps://github.com/dpovshed/octopushttp://marcjschmidt.de/blog/2014/02/08/php-high-performance.html

...and also thosehttps://github.com/reactphp/react/wiki/FAQhttps://philsturgeon.uk/blog/2013/11/benchmarking-codswallop-nodejs-v-php/https://github.com/reactphp/react/wiki/Event-Loop-Implementationshttps://github.com/php-pm/php-pm

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Questions / Demo

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Thank you!

Dennis Povshednyhttp://dennisp.tel

https://ua.linkedin.com/in/1dennis1Email: [email protected]

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ReactPHP: practical intro

Software

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