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Andras BacsaiandClaude Opus 5.5
a0fa21b448
The default stream_select() loop fails once a descriptor reaches 1024 (FD_SETSIZE). Install ext-uv and, only when an event loop extension is available, raise the soft open-file limit of Reverb up to 65536. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
58 lines
2.7 KiB
PHP
58 lines
2.7 KiB
PHP
<?php
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use Illuminate\Support\Facades\File;
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use Illuminate\Support\Facades\Process;
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/**
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* Reverb keeps one file descriptor per WebSocket connection. With an event loop extension its s6 run
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* script raises the soft open-file limit up to the hard limit (at most 65536) and still starts when it
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* cannot. Without one, ReactPHP uses stream_select(), which fails for every connection once a
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* descriptor reaches FD_SETSIZE (1024), so the limit must stay.
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*/
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beforeEach(function () {
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$this->bin = sys_get_temp_dir().'/reverb-open-files-'.bin2hex(random_bytes(4));
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File::makeDirectory($this->bin);
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// Answers the event loop extension probe (`php -r`) from FAKE_LOOP_EXTENSION, and stands in for
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// `php artisan reverb:start` by reporting the limit Reverb would get.
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File::put("{$this->bin}/php", "#!/bin/sh\nif [ \"\$1\" = \"-r\" ]; then [ \"\$FAKE_LOOP_EXTENSION\" = yes ]; exit \$?; fi\necho \"soft=\$(ulimit -Sn)\"\n");
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chmod("{$this->bin}/php", 0755);
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});
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afterEach(function () {
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File::deleteDirectory($this->bin);
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});
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function reverbSoftOpenFileLimit(string $runScript, string $hardLimit, string $softLimit, string $bin, bool $loopExtension = true): string
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{
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$result = Process::env(['PATH' => "{$bin}:/usr/bin:/bin", 'FAKE_LOOP_EXTENSION' => $loopExtension ? 'yes' : 'no'])->run(sprintf(
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// The soft limit is lowered first: a hard limit below the current soft limit is invalid.
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'ulimit -Sn %s && ulimit -Hn %s && exec sh %s',
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$softLimit,
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$hardLimit,
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escapeshellarg(base_path($runScript)),
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));
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expect($result->successful())->toBeTrue();
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return trim(str($result->output())->afterLast('soft='));
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}
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it('raises the reverb soft open-file limit up to the hard limit, at most 65536', function (string $runScript, string $hardLimit, string $softLimit, string $expected) {
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expect(reverbSoftOpenFileLimit($runScript, $hardLimit, $softLimit, $this->bin))->toBe($expected);
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})->with([
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'production' => 'docker/production/etc/s6-overlay/s6-rc.d/reverb/run',
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'development' => 'docker/development/etc/s6-overlay/s6-rc.d/reverb/run',
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])->with([
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'hard limit below the cap' => ['4096', '1024', '4096'],
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'hard limit above the cap' => ['200000', '1024', '65536'],
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'hard limit equal to the soft limit' => ['1024', '1024', '1024'],
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'soft limit already above the cap' => ['200000', '100000', '100000'],
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]);
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it('keeps the reverb soft open-file limit without an event loop extension', function (string $runScript) {
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expect(reverbSoftOpenFileLimit($runScript, '4096', '1024', $this->bin, loopExtension: false))->toBe('1024');
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})->with([
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'production' => 'docker/production/etc/s6-overlay/s6-rc.d/reverb/run',
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'development' => 'docker/development/etc/s6-overlay/s6-rc.d/reverb/run',
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]);
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