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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Celema\Core\Runtime; |
| 6 | |
| 7 | use Celema\Core\App; |
| 8 | use Celema\Core\Exception\RuntimeException; |
| 9 | use Closure; |
| 10 | |
| 11 | /** |
| 12 | * Handles requests in a FrankenPHP worker until FrankenPHP stops it or it |
| 13 | * retires: after a request that left the app unusable, after a configured |
| 14 | * number of requests, or above a memory threshold. FrankenPHP then starts |
| 15 | * a fresh worker. |
| 16 | * |
| 17 | * @internal |
| 18 | */ |
| 19 | final class FrankenPhpWorker |
| 20 | { |
| 21 | public const string MAX_REQUESTS = 'CELEMA_WORKER_MAX_REQUESTS'; |
| 22 | public const string MAX_MEMORY = 'CELEMA_WORKER_MAX_MEMORY'; |
| 23 | |
| 24 | /** |
| 25 | * @param Closure(callable(): void): bool $handleRequest Waits for a request and runs the |
| 26 | * callback for it; returns false when the worker should stop (frankenphp_handle_request). |
| 27 | */ |
| 28 | public function __construct( |
| 29 | private readonly Closure $handleRequest, |
| 30 | public readonly int $maxRequests, |
| 31 | public readonly int $maxMemory, |
| 32 | ) {} |
| 33 | |
| 34 | /** |
| 35 | * Explicit limits win over the worker's environment (for example the |
| 36 | * `env` directive of a Caddyfile worker block). Without either, the |
| 37 | * request limit is off and the memory limit is 80 % of memory_limit. |
| 38 | * |
| 39 | * @param Closure(callable(): void): bool $handleRequest |
| 40 | */ |
| 41 | public static function configure( |
| 42 | Closure $handleRequest, |
| 43 | ?int $maxRequests = null, |
| 44 | ?int $maxMemory = null, |
| 45 | ): self { |
| 46 | return new self( |
| 47 | $handleRequest, |
| 48 | $maxRequests ?? self::requestsSetting() ?? 0, |
| 49 | $maxMemory ?? self::memorySetting() ?? self::defaultMaxMemory(), |
| 50 | ); |
| 51 | } |
| 52 | |
| 53 | public function serve(App $app): false |
| 54 | { |
| 55 | // A client that disconnects must not abort a request halfway, as |
| 56 | // its teardown has to run before the worker takes the next one. |
| 57 | ignore_user_abort(true); |
| 58 | $handled = 0; |
| 59 | |
| 60 | do { |
| 61 | $running = ($this->handleRequest)(static function () use ($app): void { |
| 62 | // PHP's stat cache would keep file sizes and modification |
| 63 | // times from earlier requests. |
| 64 | clearstatcache(); |
| 65 | $app->run(); |
| 66 | }); |
| 67 | $handled++; |
| 68 | gc_collect_cycles(); |
| 69 | } while ($running && !$this->retires($app, $handled)); |
| 70 | |
| 71 | return false; |
| 72 | } |
| 73 | |
| 74 | private function retires(App $app, int $handled): bool |
| 75 | { |
| 76 | return ( |
| 77 | !$app->reusable() |
| 78 | || $this->maxRequests > 0 |
| 79 | && $handled >= $this->maxRequests |
| 80 | || $this->maxMemory > 0 |
| 81 | && memory_get_usage(true) >= $this->maxMemory |
| 82 | ); |
| 83 | } |
| 84 | |
| 85 | private static function requestsSetting(): ?int |
| 86 | { |
| 87 | $value = self::setting(self::MAX_REQUESTS); |
| 88 | |
| 89 | if ($value === null) { |
| 90 | return null; |
| 91 | } |
| 92 | |
| 93 | if (preg_match('/^\d+$/', $value) !== 1) { |
| 94 | throw new RuntimeException(self::MAX_REQUESTS . ' must be a number of requests, 0 for no limit'); |
| 95 | } |
| 96 | |
| 97 | return (int) $value; |
| 98 | } |
| 99 | |
| 100 | private static function memorySetting(): ?int |
| 101 | { |
| 102 | $value = self::setting(self::MAX_MEMORY); |
| 103 | |
| 104 | if ($value === null) { |
| 105 | return null; |
| 106 | } |
| 107 | |
| 108 | if (preg_match('/^\d+[KMG]?$/i', $value) !== 1) { |
| 109 | throw new RuntimeException( |
| 110 | self::MAX_MEMORY . ' must be a number of bytes, optionally with K, M or G, 0 for no limit', |
| 111 | ); |
| 112 | } |
| 113 | |
| 114 | return ini_parse_quantity($value); |
| 115 | } |
| 116 | |
| 117 | /** @return ?non-empty-string */ |
| 118 | private static function setting(string $name): ?string |
| 119 | { |
| 120 | $value = $_SERVER[$name] ?? $_ENV[$name] ?? getenv($name); |
| 121 | $value = is_string($value) ? trim($value) : ''; |
| 122 | |
| 123 | return $value === '' ? null : $value; |
| 124 | } |
| 125 | |
| 126 | private static function defaultMaxMemory(): int |
| 127 | { |
| 128 | $limit = (string) ini_get('memory_limit'); |
| 129 | $bytes = $limit === '' ? 0 : ini_parse_quantity($limit); |
| 130 | |
| 131 | return $bytes > 0 ? intdiv($bytes * 4, 5) : 0; |
| 132 | } |
| 133 | } |