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obscuremind
5914d8a71a
queue, scanner, signals and watchdog each had their whole pass inside a while whose last statement was an unconditional break, so every pass fell out of the loop and restartDaemon() re-executed console.php: a fresh bootstrap, settings read and database connect per pass, per node — four times a second in the signals daemon. The plan's 24 h RSS and queries/s acceptance cannot be measured on a process that never lives a second. Every break that means something (a code change, nginx stopped, MAIN's database gone) stays, and restartDaemon() still re-execs then, which is how a deploy is picked up. Two things fell out of it: the signals daemon paced itself inside the branch that read `signals`, so a node whose query failed spun as fast as MariaDB would answer; and the watchdog's CPU sample was a delta over its own 2 s sleep every pass, because a fresh process never had a previous read of /proc/stat. The numeric cluster settings render as number inputs with the bounds the save clamps to, instead of text fields that no digits-only script covered.
58 lines
2.0 KiB
PHP
58 lines
2.0 KiB
PHP
<?php
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use PHPUnit\Framework\TestCase;
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/**
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* A daemon's loop must not end in an unconditional `break`.
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*
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* Four of them did (`queue`, `scanner`, `signals`, `watchdog`): the whole pass
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* sat in a `while` whose last statement was `break`, so every pass fell out of
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* the loop and `restartDaemon()` re-executed `console.php` — a fresh bootstrap,
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* settings read and database connect per pass, per node, four times a second in
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* the signals daemon's case. The plan's 24 h RSS and queries/s acceptance
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* cannot be measured on a process that never lives that long.
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*
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* A `break` inside an `if` is how a daemon is meant to stop (a code change, an
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* nginx restart, a dead database): only the unconditional one at the end of the
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* body is refused.
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*/
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final class DaemonLoopTest extends TestCase {
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public function testNoDaemonLoopEndsWithAnUnconditionalBreak(): void {
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$rChecked = 0;
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foreach (glob(dirname(__DIR__, 2) . '/src/Cli/Commands/*Command.php') ?: [] as $rFile) {
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$rLines = file($rFile) ?: [];
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if (!str_contains(implode('', $rLines), 'restartDaemon(')) {
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continue;
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}
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foreach ($rLines as $rNo => $rLine) {
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if (!preg_match('/^(\t+)(?:\} )?while \(/', $rLine, $rM)) {
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continue;
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}
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$rChecked++;
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$rEnd = self::closes($rLines, $rNo, strlen($rM[1]));
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$rLast = $rEnd === null ? '' : trim($rLines[$rEnd - 1]);
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$this->assertNotSame(
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'break;',
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$rLast,
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basename($rFile) . ':' . $rEnd . ": the loop's last statement is an unconditional break, so the daemon re-executes itself every pass"
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);
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}
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}
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$this->assertGreaterThan(4, $rChecked, 'the daemon loops were not found at all');
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}
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/** The line (0-based) of the `}` that closes a block opened at $rNo, indented with $rTabs tabs. */
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private static function closes(array $rLines, int $rNo, int $rTabs): ?int {
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$rClose = str_repeat("\t", $rTabs) . '}';
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for ($i = $rNo + 1; $i < count($rLines); $i++) {
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if (str_starts_with($rLines[$i], $rClose)) {
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return $i;
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}
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}
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return null;
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}
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}
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