8000 Immediately try next connection when one attempt fails and fix possible race conditions (happy eyeballs) by clue · Pull Request #232 · reactphp/socket · GitHub
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Immediately try next connection when one attempt fails and fix possible race conditions (happy eyeballs) #232

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Merged
merged 4 commits into from
May 15, 2020
Merged

Immediately try next connection when one attempt fails and fix possible race conditions (happy eyeballs) #232

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2e150b4
Immediately try next connection when one attempt fails (happy eyeballs)
clue May 14, 2020
128a9d1
Fix possible race condition when connector settles immediately
clue May 14, 2020
0f2a4ec
Fix connection cleanup when connecting to same IP multiple times
clue May 14, 2020
6b3aa7b
Fix creating leftover connections when cancelling connection attempts
clue May 14, 2020
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Fix possible race condition when connector settles immediately
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@clue
clue committed May 14, 2020
commit 128a9d1dab1f47c056827425ca3c0416de81f616
5 changes: 3 additions & 2 deletions src/HappyEyeBallsConnectionBuilder.php
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Original file line number Diff line number Diff line change
Expand Up @@ -146,7 +146,8 @@ public function check($resolve, $reject)
$ip = \array_shift($this->connectQueue);

$that = $this;
$that->connectionPromises[$ip] = $this->attemptConnection($ip)->then(function ($connection) use ($that, $ip, $resolve) {
$that->connectionPromises[$ip] = $this->attemptConnection($ip);
$that->connectionPromises[$ip]->then(function ($connection) use ($that, $ip, $resolve) {
unset($that->connectionPromises[$ip]);

$that->cleanUp();
Expand Down Expand Up @@ -180,7 +181,7 @@ public function check($resolve, $reject)

// Allow next connection attempt in 100ms: https://tools.ietf.org/html/rfc8305#section-5
// Only start timer when more IPs are queued or when DNS query is still pending (might add more IPs)
if (\count($this->connectQueue) > 0 || $this->resolved[Message::TYPE_A] === false || $this->resolved[Message::TYPE_AAAA] === false) {
if ($this->nextAttemptTimer === null && (\count($this->connectQueue) > 0 || $this->resolved[Message::TYPE_A] === false || $this->resolved[Message::TYPE_AAAA] === false)) {
$this->nextAttemptTimer = $this->loop->addTimer(self::CONNECTION_ATTEMPT_DELAY, function () use ($that, $resolve, $reject) {
$that->nextAttemptTimer = null;

Expand Down
34 changes: 30 additions & 4 deletions tests/HappyEyeBallsConnectionBuilderTest.php
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Expand Up @@ -261,13 +261,12 @@ public function testConnectWillStartConnectingWithAttemptTimerWhenOnlyIpv6Resolv
$loop->expects($this->once())->method('addTimer')->with(0.1, $this->anything())->willReturn($timer);
$loop->expects($this->once())->method('cancelTimer')->with($timer);

$deferred = new Deferred();
$connector = $this->getMockBuilder('React\Socket\ConnectorInterface')->getMock();
$connector->expects($this->exactly(2))->method('connect')->withConsecutive(
array('tcp://[::1]:80?hostname=reactphp.org'),
array('tcp://[::2]:80?hostname=reactphp.org')
)->willReturnOnConsecutiveCalls(
$deferred->promise(),
\React\Promise\reject(new \RuntimeException()),
new Promise(function () { })
);

Expand All @@ -287,8 +286,6 @@ public function testConnectWillStartConnectingWithAttemptTimerWhenOnlyIpv6Resolv
$builder = new HappyEyeBallsConnectionBuilder($loop, $connector, $resolver, $uri, $host, $parts);

$builder->connect();

$deferred->reject(new \RuntimeException());
}

public function testConnectWillStartConnectingAndWillStartNextConnectionWithoutNewAttemptTimerWhenNextAttemptTimerFiresAfterIpv4Rejected()
Expand Down Expand Up @@ -566,4 +563,33 @@ public function testAttemptConnectionWillConnectViaConnectorToGivenIpv6WithAllUr

$builder->attemptConnection('::1');
}

public function testCheckCallsRejectFunctionImmediateWithoutLeavingDanglingPromiseWhenConnectorRejectsImmediately()
{
$loop = $this->getMockBuilder('React\EventLoop\LoopInterface')->getMock();

$connector = $this->getMockBuilder('React\Socket\ConnectorInterface')->getMock();
$connector->expects($this->once())->method('connect')->with('tcp://[::1]:80/path?test=yes&hostname=reactphp.org#start')->willReturn(\React\Promise\reject(new \RuntimeException()));

$resolver = $this->getMockBuilder('React\Dns\Resolver\ResolverInterface')->getMock();
$resolver->expects($this->never())->method('resolveAll');

$uri = 'tcp://reactphp.org:80/path?test=yes#start';
$host = 'reactphp.org';
$parts = parse_url($uri);

$builder = new HappyEyeBallsConnectionBuilder($loop, $connector, $resolver, $uri, $host, $parts);

$ref = new \ReflectionProperty($builder, 'connectQueue');
$ref->setAccessible(true);
$ref->setValue($builder, array('::1'));

$builder->check($this->expectCallableNever(), function () { });

$ref = new \ReflectionProperty($builder, 'connectionPromises');
$ref->setAccessible(true);
$promises = $ref->getValue($builder);

$this->assertEquals(array(), $promises);
}
}
0