Exploring Async PHP (SF Live Berlin 2019)

Exploring Async PHP
@dantleech
Symfony Live Berlin 27th
September 2019

Array TCP Connect TCP Read HTTP GET (local) HTTP GET (network) HTP GET (internet)
3 432 595 1,084
9,221
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DEPENDENCIES
Operations with no un-resolved dependencies
can be parallezied

(Application)
User Widget
Menu
Nodes
RSS Feed
Category
Widget
URL 1 URL 2 URL ...

What can we make with
an Async PHP?

Concurrrent I/O
HTTP Requests
Database Queries
Child Processes

HTTP Server
Web Socket Servers
Long Running Processes...
Web Crawlers!
Development tools
Daemons

Exploring Async PHP (SF Live Berlin 2019)

Streams
•
Abstraction layer for resources: file://, http://,
tcp://, etc
•
Can be read from and written to incrementally
•
Can be non blocking

1: File get contents
<?php
echo file_get_contents('http://localhost:8080?sleep=1');

2: Stream socket client
<?php
$stream = stream_socket_client('tcp://localhost:8080');
fwrite($stream, "GET /?sleep=1 HTTP/1.0rnrn");
echo stream_get_contents($stream);

3: Stream set blocking
<?php
stream_set_blocking($stream, false);
echo stream_get_contents($read[0]);
die(‘Hello World’);

3: Stream set blocking
<?php
stream_set_blocking($stream, false);
fwrite($stream, "GET /?sleep=1 HTTP/1.0rnrn");
$write = $except = null;
$read = [ $stream ];
stream_select($read, $write, $except, null);
echo stream_get_contents($read[0]);

4: Multiple Requests<?php
$stream1 = create_non_blocking_get('tcp://localhost:8080', ‘/?sleep=1’);
$stream2 = create_non_blocking_get('tcp://localhost:8080', ‘/?sleep=1’);
$await = [ $stream1, $stream2 ];
$write = $except = null;
while ($await) {
$read = $await;
stream_select($read, $write, $except, null);
foreach ($read as $stream) {
echo stream_get_contents($stream) . PHP_EOL;
unset($await[array_search($stream, $await)]);
fclose($stream);
}
}

Amphp
•
Born 2013
•
Redis Client
•
MySQL Client
•
Promises
•
Coroutines
•
Event Loop

Event Loop
<?php
$stream = create_non_blocking_get('tcp://localhost:8080', ‘/?sleep=1’);
Loop::onReadable($stream, function ($watcherId, $stream) {
echo stream_get_contents($stream);
});
Loop::run();

No Promise
<?php
http_request("http://example/.com/foobar", function ($response) {
echo $response->getStatusCode();
});

Promise
<?php
http_request("http://example/.com/foobar")->onResolve(function ($failure, $response) {
echo $response->getStatusCode();
});

Multiple Promise
<?php
$promise1 = http_request("http://example/.com/foobar");
$promise2 = http_request("http://example/.com/barfoo");
$results = wait ( all ($promise1, $promise2));
echo $promise1->getStatusCode();
echo $promise2->getStatusCode();

CO-
ROUTINE
CO-
ROUTINE
CO-
ROUTINE
CO-
ROUTINE
Event Loop (scheduler)

Coroutine Example
<?php
call(function () {
$response = yield http_request("http://example/.com/foobar");
echo $reponse->getStatusCode();
$body = yield $response->getBody();
echo $body;
});
call(function () {
$response = yield http_request("http://example/.com/barfoo");
});

<?php
class Runner
{
public function __construct(Workspace $workspace, array $scripts) { /** ... */ }
public function run(): int { /** ... */ }
private function runRepos(): Promise { /** ... */ }
private function runRepo($repoUrl, $scripts, int $color): Promise { /** ... */ }
private function runCommand(string $command, $cwd, int $color): Promise { /** ... */ }
private function display(ProcessInputStream $processInputStream, $color) { /** ... */ }
}

$runner = new Runner(
new Workspace(__DIR__ . '/../Workspace'),
[
'git@github.com:dantleech/fink' => [
'composer install --prefer-dist',
'vendor/bin/phpunit',
'vendor/bin/phpstan analyse --level=7',
],
'git@github.com:phpactor/path-finder' => [
'composer install',
'./vendor/bin/phpunit',
'vendor/bin/phpstan analyse --level=7',
]
]
);
$aggregateExitCode = $runner->run();
sprintf('Aggregate exit code: %s', $aggregateExitCode) . PHP_EOL;
exit($aggregateExitCode);

class Runner
{
/**
* @var array
*/
private $scripts;
/**
* @var Workspace
*/
private $workspace;
public function __construct(Workspace $workspace, array $scripts)
{
$this->scripts = $scripts;
$this->workspace = $workspace;
}
// ...

class Runner
{
// ...
public function run(): int
{
$this->workspace->reset();
$exitCodes = wait ( $this->runRepos());
return array_sum($exitCodes);
}

class Runner
{
// ...
private function runRepos(): Promise
{
$exitCodePromises = [];
$color = 31;
foreach ($this->scripts as $repoUrl => $scripts) {
$color++;
$exitCodePromises[] = $this->runRepo($repoUrl, $scripts, $color);
}
return all($exitCodePromises);
}

class Runner
{
// ...
private function runRepo($repoUrl, $scripts, int $color): Promise
{
return call(function () use ($repoUrl, $scripts, $color) {
$repoPath = $this->workspace->path(basename($repoUrl));
$exitCode = yield $this->runCommand(sprintf(
'git clone %s %s',
$repoUrl,
$repoPath,
), $this->workspace->path('/'), $color);
foreach ($scripts as $script) {
$exitCode += yield $this->runCommand($script, $repoPath, $color);
}
return $exitCode;
});
}

class Runner
{
// ...
private function runCommand(string $command, string $cwd, int $color): Promise
{
return call(function () use ($command, $cwd, $color) {
$process = new Process($command, $cwd);
$pid = yield $process->start();
$this->display($process->getStdout(), $color);
$this->display($process->getStderr(), $color);
$exitCode = yield $process->join();
return $exitCode;
});
}

class Runner
{
// ...
private function display(ProcessInputStream $processInputStream, $color): void
{
asyncCall(function () use ($processInputStream, $color) {
while (null !== $chunk = yield $processInputStream->read()) {
echo sprintf("033[%sm%s033[0m", $color, $chunk);
};
});
}

React PHP
•
Born 2012
•
Redis Client
•
MySQL Client
•
Promises
•
Event Emitter
•
Event Loop

Swoole
•
Born 2012
•
Redis Client
•
MySQL Client
•
Promises
•
Coroutines
•
Event Loop

Can out perform Go and
NodeJS*
… at some things

Build an asyncrhronous
CMS in PHP

@dantleech
Talk to me about Phpbench and Phpactor
Works for in Berlin
Examples for this talk: https://github.com/dantleech/2019-exploring-async

Exploring Async PHP (SF Live Berlin 2019)

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