1. Exploring Async PHP
@dantleech
Bulgaria PHP 9th
November 2019

2. MySQL

3. SLOW

4. HTTP Requests

5. SLOW

6. REDIS

7. SLOW

8. Elastic

9. SLOW

10. TL;DR;

11. SLOW
Network I/O

12. Array HTTP GET (local) HTTP GET (network) HTP GET (internet)
3 1084
9221
94348

13. WHO I AM
•
Daniel Leech
•
PHP since 2007
•
Phpactor: Refactoring and intellisense for VIM
•
Phpbench: Code Benchmarking
•
Fink: Link Checker
•
Works at Inviqa in Berlin

14. Product Import

15. News Website

16. Tasks with satisfied dependencies
can be parallelized

17. What can we make with
an Async PHP?

18. Concurrent I/O
•
HTTP Requests
•
Database Queries
•
Child Processes
•
File Access

19. Servers and CLI Applications
•
Web Socket Server
•
Chat Server
•
Web Crawler
•
Task Runner
•
HTTP Server

20. HTTP Server
=

21. STREAMS

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

23. 1: File get contents
<?php
echo file_get_contents('http://localhost:8080?sleep=1');

25. 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);

27. 3: Stream set blocking
<?php
$stream = stream_socket_client('tcp://localhost:8080');
stream_set_blocking($stream, false);
fwrite($stream, "GET /?sleep=1 HTTP/1.0rnrn");
echo stream_get_contents($read[0]);
die(‘Hello World’);

29. 3: Stream set blocking
<?php
$stream = stream_socket_client('tcp://localhost:8080');
stream_set_blocking($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]);

31. 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);
}
}

33. Amphp

34. EVENT LOOP

35. EVENT LOOP

36. EVENT LOOP

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

38. PROMISES

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

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

41. 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();

42. You can yield a promise ...

43. COROUTINES

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

45. 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");
});

46. LET’S
BUILD A CI
SYSTEM

47. <?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) { /** ... */ }
}

48. $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);

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

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

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

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

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

54. class Runner
{
// ...
private function display(ProcessInputStream $processInputStream): void
{
asyncCall(function () use ($processInputStream) {
while (null !== $chunk = yield $processInputStream->read()) {
echo $chunk;
};
});
}

56. Other Frameworks

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

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

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

62. PHP Extension CLI Only

63. Can out perform Go and
NodeJS*
… at some things

65. Think Differently

66. CO-
ROUTINE
CO-
ROUTINE
CO-
ROUTINE
CO-
ROUTINE
CO-
ROUTINE
CO-
ROUTINE

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