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Fix simultaneous requests to prepare the same query

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Aaron Piotrowski 2018-10-30 11:12:14 -05:00
parent 01f9b5c1c6
commit b7fa576952
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1 changed files with 33 additions and 14 deletions
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37
src/Pool.php
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@ -13,7 +13,6 @@ use Amp\Sql\Pool as SqlPool;
use Amp\Sql\ResultSet as SqlResultSet;
use Amp\Sql\Statement as SqlStatement;
use Amp\Sql\Transaction as SqlTransaction;
use Amp\Success;
use cash\LRUCache;
use function Amp\call;
@ -64,14 +63,18 @@ final class Pool extends ConnectionPool implements Link
$this->statementWatcher = Loop::repeat(1000, static function () use (&$idleTimeout, $statements) {
$now = \time();
foreach ($statements as $hash => $statement) {
foreach ($statements as $sql => $statement) {
if ($statement instanceof Promise) {
continue;
}
\assert($statement instanceof StatementPool);
if ($statement->getLastUsedAt() + $idleTimeout > $now) {
return;
}
$statements->remove($hash);
$statements->remove($sql);
}
});
@ -143,18 +146,34 @@ final class Pool extends ConnectionPool implements Link
throw new \Error("The pool has been closed");
}
return call(function () use ($sql) {
if ($this->statements->containsKey($sql)) {
$statement = $this->statements->get($sql);
\assert($statement instanceof SqlStatement);
if ($statement instanceof Promise) {
$statement = yield $statement; // Wait for prior request to resolve.
}
\assert($statement instanceof StatementPool);
if ($statement->isAlive()) {
return new Success($statement);
return $statement;
}
}
return call(function () use ($sql) {
$statement = yield parent::prepare($sql);
\assert($statement instanceof SqlStatement);
$this->statements->put($sql, $statement);
$promise = parent::prepare($sql);
$this->statements->put($sql, $promise); // Insert promise into queue so subsequent requests get promise.
try {
$statement = yield $promise;
\assert($statement instanceof StatementPool);
} catch (\Throwable $exception) {
$this->statements->remove($sql);
throw $exception;
}
$this->statements->put($sql, $statement); // Replace promise in queue with statement object.
return $statement;
});
}