Proper AbstractPool and add PooledStatement
This commit is contained in:
Aaron Piotrowski
parent
fe530cf590
commit
15336ca7fc
@ -2,72 +2,70 @@
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namespace Amp\Sql;
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use function Amp\call;
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use Amp\CallableMaker;
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use function Amp\coroutine;
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use Amp\Deferred;
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use Amp\Loop;
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use Amp\Promise;
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use function Amp\call;
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use function Amp\coroutine;
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abstract class AbstractPool implements Pool
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{
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use CallableMaker;
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/** @var Connector */
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protected $connector;
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private $connector;
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/** @var ConnectionConfig */
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protected $config;
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private $connectionConfig;
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/** @var int */
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protected $maxConnections;
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private $maxConnections;
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/** @var \SplQueue */
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protected $idle;
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private $idle;
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/** @var \SplObjectStorage */
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protected $connections;
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private $connections;
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/** @var bool */
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protected $closed = false;
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/** @var \Amp\Promise|null */
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private $promise;
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/** @var string */
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protected $timeoutWatcher;
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/** @var int */
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protected $idleTimeout = Pool::DEFAULT_IDLE_TIMEOUT;
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/** @var \Amp\Deferred|null */
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private $deferred;
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/** @var callable */
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protected $prepare;
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private $prepare;
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/** @var int */
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protected $lastUsedAt;
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private $pending = 0;
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/** @var Promise|null */
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protected $promise;
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/** @var int */
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private $idleTimeout = self::DEFAULT_IDLE_TIMEOUT;
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/** @var Deferred|null */
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protected $deferred;
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/** @var string */
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private $timeoutWatcher;
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/** @var int Number of pending connections. */
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protected $pending = 0;
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/** @var bool */
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private $closed = false;
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/**
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* @param ConnectionConfig $config
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* @param int $maxConnections
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* @param Connector $connector
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* Create a default connector object based on the library of the extending class.
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*
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* @throws \Error If $maxConnections is less than 1.
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* @return Connector
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*/
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abstract protected function createDefaultConnector(): Connector;
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public function __construct(
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ConnectionConfig $config,
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int $maxConnections = Pool::DEFAULT_MAX_CONNECTIONS,
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int $maxConnections = self::DEFAULT_MAX_CONNECTIONS,
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Connector $connector = null
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) {
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$this->connector = $connector ?? $this->defaultConnector();
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$this->config = $config;
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$this->maxConnections = $maxConnections;
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$this->connector = $connector ?? $this->createDefaultConnector();
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$this->connectionConfig = $config;
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$this->maxConnections = $maxConnections;
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if ($this->maxConnections < 1) {
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throw new \Error("Pool must contain at least one connection");
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}
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@ -81,8 +79,8 @@ abstract class AbstractPool implements Pool
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$this->timeoutWatcher = Loop::repeat(1000, static function () use (&$idleTimeout, $connections, $idle) {
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$now = \time();
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while (!$idle->isEmpty()) {
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/** @var Connection $connection */
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$connection = $idle->bottom();
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\assert($connection instanceof Link);
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if ($connection->lastUsedAt() + $idleTimeout > $now) {
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return;
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@ -96,8 +94,6 @@ abstract class AbstractPool implements Pool
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});
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Loop::unreference($this->timeoutWatcher);
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$this->lastUsedAt = \time();
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}
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public function __destruct()
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@ -105,143 +101,6 @@ abstract class AbstractPool implements Pool
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Loop::cancel($this->timeoutWatcher);
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}
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public function query(string $sql): Promise
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{
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return call(function () use ($sql) {
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/** @var Connection $connection */
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$connection = yield from $this->pop();
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try {
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$result = yield $connection->query($sql);
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} catch (\Throwable $exception) {
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$this->push($connection);
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throw $exception;
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}
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if ($result instanceof Operation) {
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$result->onDestruct(function () use ($connection) {
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$this->push($connection);
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});
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} else {
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$this->push($connection);
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}
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$this->lastUsedAt = \time();
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return $result;
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});
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}
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public function prepare(string $sql): Promise
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{
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return call(function () use ($sql) {
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$statement = yield from $this->doPrepare($sql);
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$this->lastUsedAt = \time();
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return $this->newPooledStatement($this, $statement, $this->prepare);
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});
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}
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public function execute(string $sql, array $params = []): Promise
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{
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return call(function () use ($sql, $params) {
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/** @var Connection $connection */
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$connection = yield from $this->pop();
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try {
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$result = yield $connection->execute($sql, $params);
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} catch (\Throwable $exception) {
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$this->push($connection);
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throw $exception;
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}
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if ($result instanceof Operation) {
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$result->onDestruct(function () use ($connection) {
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$this->push($connection);
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});
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} else {
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$this->push($connection);
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}
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$this->lastUsedAt = \time();
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return $result;
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});
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}
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public function isAlive(): bool
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{
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return !$this->closed;
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}
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public function close()
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{
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// TODO: Implement close() method.
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}
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public function lastUsedAt(): int
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{
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return $this->lastUsedAt;
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}
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public function transaction(int $isolation = Transaction::ISOLATION_COMMITTED): Promise
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{
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return call(function () use ($isolation) {
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/** @var Connection $connection */
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$connection = yield from $this->pop();
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try {
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/** @var Transaction $transaction */
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$transaction = yield $connection->transaction($isolation);
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} catch (\Throwable $exception) {
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$this->push($connection);
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throw $exception;
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}
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$transaction->onDestruct(function () use ($connection) {
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$this->push($connection);
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});
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$this->lastUsedAt = \time();
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return $transaction;
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});
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}
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/**
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* Extracts an idle connection from the pool. The connection is completely removed from the pool and cannot be
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* put back into the pool. Useful for operations where connection state must be changed.
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*
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* @return Promise<Connection>
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*/
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public function extractConnection(): Promise
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{
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return call(function () {
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$connection = yield from $this->pop();
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$this->connections->detach($connection);
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$this->lastUsedAt = \time();
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return $connection;
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});
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}
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public function getConnectionCount(): int
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{
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return $this->connections->count();
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}
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public function getIdleConnectionCount(): int
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{
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return $this->idle->count();
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}
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public function getMaxConnections(): int
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{
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return $this->maxConnections;
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}
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public function getIdleTimeout(): int
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{
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return $this->idleTimeout;
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@ -256,38 +115,275 @@ abstract class AbstractPool implements Pool
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$this->idleTimeout = $timeout;
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}
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protected function doPrepare(string $sql): \Generator
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public function lastUsedAt(): int
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{
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/** @var Connection $connection */
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// Simple implementation... can be improved if needed.
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$time = 0;
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foreach ($this->connections as $connection) {
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\assert($connection instanceof Link);
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if (($lastUsedAt = $connection->lastUsedAt()) > $time) {
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$time = $lastUsedAt;
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}
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}
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return $time;
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}
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/**
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* @return bool
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*/
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public function isAlive(): bool
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{
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return !$this->closed;
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}
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/**
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* Close all connections in the pool. No further queries may be made after a pool is closed.
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*/
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public function close()
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{
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$this->closed = true;
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foreach ($this->connections as $connection) {
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$connection->close();
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}
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$this->idle = new \SplQueue;
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$this->connections = new \SplObjectStorage;
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$this->prepare = null;
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}
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/**
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* {@inheritdoc}
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*/
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public function extractConnection(): Promise
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{
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return call(function () {
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$connection = yield from $this->pop();
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$this->connections->detach($connection);
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return $connection;
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});
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}
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/**
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* {@inheritdoc}
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*/
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public function getConnectionCount(): int
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{
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return $this->connections->count();
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}
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/**
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* {@inheritdoc}
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*/
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public function getIdleConnectionCount(): int
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{
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return $this->idle->count();
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}
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/**
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* {@inheritdoc}
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*/
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public function getMaxConnections(): int
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{
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return $this->maxConnections;
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}
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/**
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* @return \Generator
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*
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* @resolve Link
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*
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* @throws FailureException If creating a new connection fails.
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* @throws \Error If the pool has been closed.
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*/
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protected function pop(): \Generator
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{
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if ($this->closed) {
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throw new \Error("The pool has been closed");
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}
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while ($this->promise !== null && $this->connections->count() + $this->pending >= $this->getMaxConnections()) {
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yield $this->promise; // Prevent simultaneous connection creation when connection count is at maximum - 1.
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}
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do {
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// While loop to ensure an idle connection is available after promises below are resolved.
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while ($this->idle->isEmpty()) {
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if ($this->connections->count() + $this->pending < $this->getMaxConnections()) {
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// Max connection count has not been reached, so open another connection.
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++$this->pending;
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try {
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$connection = yield $this->connector->connect($this->connectionConfig);
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if (!$connection instanceof Link) {
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throw new \Error(\sprintf(
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"%s::connect() must resolve to an instance of %s",
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\get_class($this->connector),
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Link::class
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));
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}
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} finally {
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--$this->pending;
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}
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$this->connections->attach($connection);
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return $connection;
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}
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// All possible connections busy, so wait until one becomes available.
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try {
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$this->deferred = new Deferred;
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// May be resolved with defunct connection, but that connection will not be added to $this->idle.
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yield $this->promise = $this->deferred->promise();
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} finally {
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$this->deferred = null;
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$this->promise = null;
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}
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}
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$connection = $this->idle->shift();
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\assert($connection instanceof Link);
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if ($connection->isAlive()) {
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return $connection;
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}
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$this->connections->detach($connection);
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} while (!$this->closed);
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throw new FailureException("Pool closed before an active connection could be obtained");
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}
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/**
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* @param Link $connection
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*
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* @throws \Error If the connection is not part of this pool.
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*/
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protected function push(Link $connection)
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{
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\assert(isset($this->connections[$connection]), 'Connection is not part of this pool');
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if ($connection->isAlive()) {
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$this->idle->push($connection);
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} else {
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$this->connections->detach($connection);
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}
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if ($this->deferred instanceof Deferred) {
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$this->deferred->resolve($connection);
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}
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}
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/**
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* {@inheritdoc}
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*/
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public function query(string $sql): Promise
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{
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return call(function () use ($sql) {
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$connection = yield from $this->pop();
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\assert($connection instanceof Link);
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try {
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/** @var Statement $statement */
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$statement = yield $connection->prepare($sql);
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$result = yield $connection->query($sql);
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} catch (\Throwable $exception) {
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$this->push($connection);
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throw $exception;
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}
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if ($result instanceof Operation) {
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$result->onDestruct(function () use ($connection) {
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$this->push($connection);
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});
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} else {
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$this->push($connection);
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}
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return $result;
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});
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}
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/**
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* {@inheritdoc}
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*/
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public function execute(string $sql, array $params = []): Promise
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{
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return call(function () use ($sql, $params) {
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$connection = yield from $this->pop();
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\assert($connection instanceof Link);
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try {
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$result = yield $connection->execute($sql, $params);
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} catch (\Throwable $exception) {
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$this->push($connection);
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throw $exception;
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}
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if ($result instanceof Operation) {
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$result->onDestruct(function () use ($connection) {
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$this->push($connection);
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});
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} else {
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$this->push($connection);
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}
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return $result;
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});
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}
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/**
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* {@inheritdoc}
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*
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* Prepared statements returned by this method will stay alive as long as the pool remains open.
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*/
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public function prepare(string $sql): Promise
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{
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return call(function () use ($sql) {
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$connection = yield from $this->pop();
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\assert($connection instanceof Link);
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try {
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$statement = yield $connection->prepare($sql);
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\assert($statement instanceof Statement);
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\assert(
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$statement instanceof Operation,
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Statement::class . " instances returned from connections must implement " . Operation::class
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);
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} catch (\Throwable $exception) {
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$this->push($connection);
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throw $exception;
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}
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$statement->onDestruct(function () use ($connection) {
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$this->push($connection);
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});
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$this->lastUsedAt = \time();
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return $statement;
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return new PooledStatement($this, $statement, $this->prepare);
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});
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}
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abstract protected function pop(): \Generator;
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/**
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* {@inheritdoc}
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*/
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public function transaction(int $isolation = Transaction::ISOLATION_COMMITTED): Promise
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{
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return call(function () use ($isolation) {
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$connection = yield from $this->pop();
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\assert($connection instanceof Link);
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abstract protected function push(Connection $connection);
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abstract protected function defaultConnector(): Connector;
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abstract protected function newPooledStatement(Pool $pool, Statement $statement, callable $prepare): Statement;
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try {
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$transaction = yield $connection->transaction($isolation);
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\assert($transaction instanceof Transaction);
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} catch (\Throwable $exception) {
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$this->push($connection);
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throw $exception;
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}
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$transaction->onDestruct(function () use ($connection) {
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$this->push($connection);
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});
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return $transaction;
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});
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}
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}
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145
src/PooledStatement.php
Normal file
145
src/PooledStatement.php
Normal file
@ -0,0 +1,145 @@
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<?php
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namespace Amp\Sql;
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use Amp\Loop;
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use Amp\Promise;
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use function Amp\call;
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final class PooledStatement implements Statement
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{
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/** @var \Amp\Sql\Pool */
|
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private $pool;
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|
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/** @var \SplQueue */
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private $statements;
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/** @var string */
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private $sql;
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/** @var int */
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private $lastUsedAt;
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/** @var string */
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private $timeoutWatcher;
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/** @var callable */
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private $prepare;
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/**
|
||||
* @param Pool $pool Pool used to re-create the statement if the original closes.
|
||||
* @param Statement $statement Original prepared statement returned from the Link.
|
||||
* @param callable $prepare Callable that returns a new prepared statement.
|
||||
*/
|
||||
public function __construct(Pool $pool, Statement $statement, callable $prepare)
|
||||
{
|
||||
$this->lastUsedAt = \time();
|
||||
$this->statements = $statements = new \SplQueue;
|
||||
$this->pool = $pool;
|
||||
$this->prepare = $prepare;
|
||||
$this->sql = $statement->getQuery();
|
||||
|
||||
$this->statements->push($statement);
|
||||
|
||||
$this->timeoutWatcher = Loop::repeat(1000, static function () use ($pool, $statements) {
|
||||
$now = \time();
|
||||
$idleTimeout = ((int) ($pool->getIdleTimeout() / 10)) ?: 1;
|
||||
|
||||
while (!$statements->isEmpty()) {
|
||||
/** @var Statement $statement */
|
||||
$statement = $statements->bottom();
|
||||
|
||||
if ($statement->lastUsedAt() + $idleTimeout > $now) {
|
||||
return;
|
||||
}
|
||||
|
||||
$statements->shift();
|
||||
}
|
||||
});
|
||||
|
||||
Loop::unreference($this->timeoutWatcher);
|
||||
}
|
||||
|
||||
public function __destruct()
|
||||
{
|
||||
Loop::cancel($this->timeoutWatcher);
|
||||
}
|
||||
|
||||
/**
|
||||
* {@inheritdoc}
|
||||
*
|
||||
* Unlike regular statements, as long as the pool is open this statement will not die.
|
||||
*/
|
||||
public function execute(array $params = []): Promise
|
||||
{
|
||||
$this->lastUsedAt = \time();
|
||||
|
||||
return call(function () use ($params) {
|
||||
if (!$this->statements->isEmpty()) {
|
||||
do {
|
||||
/** @var Statement $statement */
|
||||
$statement = $this->statements->shift();
|
||||
} while (!$statement->isAlive() && !$this->statements->isEmpty());
|
||||
} else {
|
||||
$statement = yield ($this->prepare)($this->sql);
|
||||
}
|
||||
|
||||
try {
|
||||
$result = yield $statement->execute($params);
|
||||
} catch (\Throwable $exception) {
|
||||
$this->push($statement);
|
||||
throw $exception;
|
||||
}
|
||||
|
||||
if ($result instanceof Operation) {
|
||||
$result->onDestruct(function () use ($statement) {
|
||||
$this->push($statement);
|
||||
});
|
||||
} else {
|
||||
$this->push($statement);
|
||||
}
|
||||
|
||||
return $result;
|
||||
});
|
||||
}
|
||||
|
||||
/**
|
||||
* Only retains statements if less than 10% of the pool is consumed by this statement and the pool has
|
||||
* available connections.
|
||||
*
|
||||
* @param Statement $statement
|
||||
*/
|
||||
private function push(Statement $statement)
|
||||
{
|
||||
$maxConnections = $this->pool->getMaxConnections();
|
||||
|
||||
if ($this->statements->count() > ($maxConnections / 10)) {
|
||||
return;
|
||||
}
|
||||
|
||||
if ($maxConnections === $this->pool->getConnectionCount() && $this->pool->getIdleConnectionCount() === 0) {
|
||||
return;
|
||||
}
|
||||
|
||||
$this->statements->push($statement);
|
||||
}
|
||||
|
||||
|
||||
/** {@inheritdoc} */
|
||||
public function isAlive(): bool
|
||||
{
|
||||
return $this->pool->isAlive();
|
||||
}
|
||||
|
||||
/** {@inheritdoc} */
|
||||
public function getQuery(): string
|
||||
{
|
||||
return $this->sql;
|
||||
}
|
||||
|
||||
/** {@inheritdoc} */
|
||||
public function lastUsedAt(): int
|
||||
{
|
||||
return $this->lastUsedAt;
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user