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[RateLimiter] Fix RateLimit->getRetryAfter() return value when consuming 0 or last tokens. #52835

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[RateLimiter] Fix RateLimit->getRetryAfter() return value when consuming 0 or last tokens. #52835

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3956807
[RateLimit] Allow to get RateLimit without consuming again.
ERuban Nov 30, 2023
717b382
[RateLimit] Allow to get RateLimit without consuming again.
ERuban Nov 30, 2023
788a44d
[RateLimiter] Allow to get RateLimit without consuming again.
ERuban Nov 30, 2023
59aedb8
[RateLimit] Allow to get RateLimit without consuming again.
ERuban Nov 30, 2023
6fe7205
[RateLimit] Allow to get RateLimit without consuming again.
ERuban Nov 30, 2023
2d9fb06
fix_rate_limit_bc_after_51676_pr
ERuban Dec 6, 2023
c15d76d
[RateLimiter] Allow to get RateLimit without consuming again.
ERuban Dec 13, 2023
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22 changes: 18 additions & 4 deletions src/Symfony/Component/RateLimiter/Policy/SlidingWindowLimiter.php
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Original file line number Diff line number Diff line change
Expand Up @@ -65,21 +65,35 @@ public function reserve(int $tokens = 1, float $maxTime = null): Reservation
$now = microtime(true);
$hitCount = $window->getHitCount();
$availableTokens = $this->getAvailableTokens($hitCount);
if ($availableTokens >= $tokens) {
if (0 !== $tokens && $availableTokens > $tokens) {
$window->add($tokens);

$reservation = new Reservation($now, new RateLimit($this->getAvailableTokens($window->getHitCount()), \DateTimeImmutable::createFromFormat('U', floor($now)), true, $this->limit));
} else {
if ($availableTokens === $tokens) {
$window->add($tokens);
}

$waitDuration = $window->calculateTimeForTokens($this->limit, max(1, $tokens));

if (null !== $maxTime && $waitDuration > $maxTime) {
if ($availableTokens !== $tokens && 0 !== $tokens && null !== $maxTime && $waitDuration > $maxTime) {
// process needs to wait longer than set interval
throw new MaxWaitDurationExceededException(sprintf('The rate limiter wait time ("%d" seconds) is longer than the provided maximum time ("%d" seconds).', $waitDuration, $maxTime), new RateLimit($this->getAvailableTokens($window->getHitCount()), \DateTimeImmutable::createFromFormat('U', floor($now + $waitDuration)), false, $this->limit));
}

$window->add($tokens);
if ($availableTokens !== $tokens) {
$window->add($tokens);
}

if ($availableTokens === $tokens || 0 === $tokens) {
$accepted = true;
$timeToAct = $now;
} else {
$accepted = false;
$timeToAct = $now + $waitDuration;
}

$reservation = new Reservation($now + $waitDuration, new RateLimit($this->getAvailableTokens($window->getHitCount()), \DateTimeImmutable::createFromFormat('U', floor($now + $waitDuration)), false, $this->limit));
$reservation = new Reservation($timeToAct, new RateLimit($this->getAvailableTokens($window->getHitCount()), \DateTimeImmutable::createFromFormat('U', floor($now + $waitDuration)), $accepted, $this->limit));
}

if (0 < $tokens) {
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41 changes: 41 additions & 0 deletions src/Symfony/Component/RateLimiter/Tests/Policy/SlidingWindowLimiterTest.php
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Original file line number Diff line number Diff line change
Expand Up @@ -54,6 +54,44 @@ public function testConsume()
$this->assertSame(10, $rateLimit->getLimit());
}

public function testConsumeLastToken()
{
$limiter = $this->createLimiter();
$limiter->reset();
$limiter->consume(9);

$rateLimit = $limiter->consume(1);
$this->assertSame(0, $rateLimit->getRemainingTokens());
$this->assertTrue($rateLimit->isAccepted());
$this->assertEquals(
\DateTimeImmutable::createFromFormat('U', (string) floor(microtime(true) + 12 / 10)),
$rateLimit->getRetryAfter()
);
}

public function testConsumeZeroTokens()
{
$limiter = $this->createLimiter();
$limiter->reset();

$rateLimit = $limiter->consume(0);
$this->assertTrue($rateLimit->isAccepted());
$this->assertEquals(
\DateTimeImmutable::createFromFormat('U', (string) floor(microtime(true))),
$rateLimit->getRetryAfter()
);

$limiter->reset();
$limiter->consume(10);

$rateLimit = $limiter->consume(0);
$this->assertTrue($rateLimit->isAccepted());
$this->assertEquals(
\DateTimeImmutable::createFromFormat('U', (string) floor(microtime(true) + 12 / 10)),
$rateLimit->getRetryAfter()
);
}

public function testWaitIntervalOnConsumeOverLimit()
{
$limiter = $this->createLimiter();
Expand All @@ -76,6 +114,9 @@ public function testReserve()

// 2 over the limit, causing the WaitDuration to become 2/10th of the 12s interval
$this->assertEqualsWithDelta(12 / 5, $limiter->reserve(4)->getWaitDuration(), 1);

$limiter->reset();
$this->assertEquals(0, $limiter->reserve(10)->getWaitDuration());
}

private function createLimiter(): SlidingWindowLimiter
Expand Down
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