Christopher Pitt
Writer and coder, working at ringier.co.za
Async PHP
Applications
Hi, I'm Chris
Let's start
with a website...
composer require
"amphp/aerys:^0.7.4"
Creating routes
server.php
Using different methods and paths
server.php
Creating a host
server.php
Creating a public folder
server.php
vendor/bin/aerys -d -c server.php
What about when a route changes?
composer require --dev "yosymfony/resource-watcher:^1.2"
Creating a finder
scripts/watch
Creating a watcher
scripts/watch
Acting on changes
scripts/watch
Controlling processes easily...
Starting processes
helpers.php
Identifying processes
helpers.php
Stopping processes
helpers.php
Restarting the server
scripts/watch
How does this help us?
Creating responders
app/Responder/HomePageResponder.php
Creating invocable route handlers
server.php
How is this different
to my favourite framework?
Machines can execute code in different ways...
They can execute synchronously,
They can execute asynchronously,
They can execute
in parallel.
We write asynchronous code using generators!?
Let's talk about it...
We have arrays...
We have array-like things...
We have iterators...
Generators are an easy way to produce iterator-like objects
Sometimes they help to
save memory
Sometimes they help to
write cleaner code
They generate new data on-demand
What if we use them to generate new code
on-demand?
Back to the website...
Creating an HTML template
resources/views/register.html
Returning a template
server.php
Getting posted values
server.php
Let's make this reusable...
Making a helper function
helpers.php
Using the helper function
server.php
composer require
"league/plates:^3.3"
composer require "amphp/parallel-functions:^0.1.2"
Designing a helper function
helpers.php
Using the helper function
server.php
Let's talk to the database...
composer require "amphp/mysql:^0.3.1"
Connecting to the database
helpers.php
Executing prepared statements
helpers.php
Using these helper functions
server.php
Let's talk specifics!
The Filesystem library uses EIO, Parallel,
or blocking
The Parallel Functions library uses Parallel
The Parallel library uses PThreads or Process Control
The MySQL library uses
a custom client
All of these return
Amp promises
There's a bunch of boilerplate, though...
composer require "pre/async:^0.8.0"
Good code
helpers.php
Better code
helpers.pre
composer require "pre/short-closures:^0.6.0"
Good code
helpers.php
Better code
helpers.pre
Enabling these...
server.php
There's a lot more to this preprocessing stuff
longer talk: https://youtu.be/0AZRp_8TT0U
What about WebSockets?!
Accepting connections
server.php
Connecting to the server
server.php
Connect to the server from Javascript
What about testing?!
Use PHPUnit,
When you need to
test promises, use
Amp\wait($promise)
You can even duplicate the server watcher to run tests after changes
What about hosting?!
Forwarding requests from Nginx
Thanks
twitter.com/assertchris
slides.com/assertchris
Async PHP Applications
By Christopher Pitt
Async PHP Applications
You've probably been to a couple talks, about how to do "asynchronous things" with PHP. What the experts don't tell you is that the hard part starts when you need to build an application. Sure, there are tools for starting an HTTP server or connecting to a web socket. But what about when you need to write to a database or send an email. You go searching for good tutorials, and all you get is API documentation; about how to use each component in isolation. Say goodbye to that frustration. In this workshop, I'm going to show you how to build an entirely asynchronous, high-concurrency PHP application. We'll bring those isolated components together, to build a real application.
