bug #19101 [Session] fix PDO transaction aborted under PostgreSQL (Tobion)
This PR was merged into the 2.7 branch.
Discussion
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[Session] fix PDO transaction aborted under PostgreSQL
| Q | A
| ------------- | ---
| Branch? | 2.7
| Bug fix? | yes
| New feature? | no
| BC breaks? | no
| Deprecations? | no
| Tests pass? | yes
| Fixed tickets | #14641
| License | MIT
| Doc PR |
Fixes the transactional concurrency error handling for PostgreSQL which does not allow to execute further queries in a transaction with an error.
Because of the loop, look at the diff with whitespace ignored to see the difference: https://github.com/symfony/symfony/pull/19101/files?w=1
Commits
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f8eefa0
[Session] fix PDO transaction aborted under PostgreSQL
This commit is contained in:
commit
9df08fac89
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@ -504,54 +504,51 @@ class PdoSessionHandler implements \SessionHandlerInterface
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$selectSql = $this->getSelectSql();
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$selectStmt = $this->pdo->prepare($selectSql);
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$selectStmt->bindParam(':id', $sessionId, \PDO::PARAM_STR);
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$selectStmt->execute();
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$sessionRows = $selectStmt->fetchAll(\PDO::FETCH_NUM);
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do {
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$selectStmt->execute();
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$sessionRows = $selectStmt->fetchAll(\PDO::FETCH_NUM);
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if ($sessionRows) {
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if ($sessionRows[0][1] + $sessionRows[0][2] < time()) {
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$this->sessionExpired = true;
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return '';
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}
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return is_resource($sessionRows[0][0]) ? stream_get_contents($sessionRows[0][0]) : $sessionRows[0][0];
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}
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if (self::LOCK_TRANSACTIONAL === $this->lockMode && 'sqlite' !== $this->driver) {
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// Exclusive-reading of non-existent rows does not block, so we need to do an insert to block
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// until other connections to the session are committed.
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try {
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$insertStmt = $this->pdo->prepare(
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"INSERT INTO $this->table ($this->idCol, $this->dataCol, $this->lifetimeCol, $this->timeCol) VALUES (:id, :data, :lifetime, :time)"
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);
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$insertStmt->bindParam(':id', $sessionId, \PDO::PARAM_STR);
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$insertStmt->bindValue(':data', '', \PDO::PARAM_LOB);
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$insertStmt->bindValue(':lifetime', 0, \PDO::PARAM_INT);
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$insertStmt->bindValue(':time', time(), \PDO::PARAM_INT);
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$insertStmt->execute();
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} catch (\PDOException $e) {
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// Catch duplicate key error because other connection created the session already.
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// It would only not be the case when the other connection destroyed the session.
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if (0 === strpos($e->getCode(), '23')) {
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// Retrieve finished session data written by concurrent connection. SELECT
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// FOR UPDATE is necessary to avoid deadlock of connection that starts reading
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// before we write (transform intention to real lock).
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$selectStmt->execute();
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$sessionRows = $selectStmt->fetchAll(\PDO::FETCH_NUM);
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if ($sessionRows) {
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return is_resource($sessionRows[0][0]) ? stream_get_contents($sessionRows[0][0]) : $sessionRows[0][0];
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}
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if ($sessionRows) {
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if ($sessionRows[0][1] + $sessionRows[0][2] < time()) {
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$this->sessionExpired = true;
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return '';
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}
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throw $e;
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return is_resource($sessionRows[0][0]) ? stream_get_contents($sessionRows[0][0]) : $sessionRows[0][0];
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}
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}
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return '';
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if (self::LOCK_TRANSACTIONAL === $this->lockMode && 'sqlite' !== $this->driver) {
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// Exclusive-reading of non-existent rows does not block, so we need to do an insert to block
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// until other connections to the session are committed.
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try {
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$insertStmt = $this->pdo->prepare(
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"INSERT INTO $this->table ($this->idCol, $this->dataCol, $this->lifetimeCol, $this->timeCol) VALUES (:id, :data, :lifetime, :time)"
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);
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$insertStmt->bindParam(':id', $sessionId, \PDO::PARAM_STR);
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$insertStmt->bindValue(':data', '', \PDO::PARAM_LOB);
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$insertStmt->bindValue(':lifetime', 0, \PDO::PARAM_INT);
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$insertStmt->bindValue(':time', time(), \PDO::PARAM_INT);
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$insertStmt->execute();
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} catch (\PDOException $e) {
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// Catch duplicate key error because other connection created the session already.
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// It would only not be the case when the other connection destroyed the session.
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if (0 === strpos($e->getCode(), '23')) {
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// Retrieve finished session data written by concurrent connection by restarting the loop.
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// We have to start a new transaction as a failed query will mark the current transaction as
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// aborted in PostgreSQL and disallow further queries within it.
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$this->rollback();
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$this->beginTransaction();
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continue;
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}
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throw $e;
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}
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}
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return '';
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} while (true);
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}
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/**
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@ -362,4 +362,8 @@ class MockPdo extends \PDO
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public function beginTransaction()
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{
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}
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public function rollBack()
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{
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}
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}
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