mirror of
https://we.phorge.it/source/phorge.git
synced 2024-12-23 05:50:55 +01:00
Restore Lisk transactional methods
Summary: Restores a (simplified and improved) version of Lisk transactions. This doesn't actually use transactions anywhere yet. DifferentialRevisionEditor is the #1 (and only?) case where we have transaction problems right now, but sticking save() inside a transaction unconditionally will leave us holding a transaction open for like a million years while we run Herald rules, etc. I want to do some refactoring there separately from this diff before making it transactional. NOTE: @jungejason / @nh, can one of you verify these unit tests pass on HPHP/i/vm when you get a chance? I vaguely recall there was some problem with (int)$resource. We can land this safely without verifying that, but should check before we start using it anywhere. Test Plan: Ran unit tests. Reviewers: btrahan, nh, jungejason Reviewed By: btrahan CC: aran, epriestley Maniphest Tasks: T605 Differential Revision: https://secure.phabricator.com/D1515
This commit is contained in:
epriestley
parent
2c3a08b37b
commit
4f018488ae
9 changed files with 361 additions and 180 deletions
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@ -21,6 +21,7 @@ phutil_register_library_map(array(
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'AphrontController' => 'aphront/controller',
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'AphrontCrumbsView' => 'view/layout/crumbs',
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'AphrontDatabaseConnection' => 'storage/connection/base',
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'AphrontDatabaseTransactionState' => 'storage/transaction',
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'AphrontDefaultApplicationConfiguration' => 'aphront/default/configuration',
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'AphrontDefaultApplicationController' => 'aphront/default/controller',
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'AphrontDialogResponse' => 'aphront/response/dialog',
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@ -1,7 +1,7 @@
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<?php
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/*
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* Copyright 2011 Facebook, Inc.
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* Copyright 2012 Facebook, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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@ -17,12 +17,13 @@
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*/
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/**
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* @task xaction Transaction Management
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* @group storage
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*/
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abstract class AphrontDatabaseConnection {
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private static $transactionStacks = array();
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private static $transactionShutdownRegistered = false;
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private static $transactionStates = array();
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private $initializingTransactionState;
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abstract public function getInsertID();
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abstract public function getAffectedRows();
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@ -47,179 +48,107 @@ abstract class AphrontDatabaseConnection {
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return call_user_func_array('queryfx', $args);
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}
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// TODO: Probably need to reset these when we catch a connection exception
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// in the transaction stack.
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protected function &getLockLevels() {
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static $levels = array();
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$key = $this->getTransactionKey();
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if (!isset($levels[$key])) {
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$levels[$key] = array(
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'read' => 0,
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'write' => 0,
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);
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}
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return $levels[$key];
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}
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/* -( Transaction Management )--------------------------------------------- */
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public function isReadLocking() {
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$levels = &$this->getLockLevels();
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return ($levels['read'] > 0);
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}
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public function isWriteLocking() {
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$levels = &$this->getLockLevels();
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return ($levels['write'] > 0);
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}
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public function startReadLocking() {
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$levels = &$this->getLockLevels();
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++$levels['read'];
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return $this;
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}
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public function startWriteLocking() {
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$levels = &$this->getLockLevels();
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++$levels['write'];
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return $this;
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}
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public function stopReadLocking() {
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$levels = &$this->getLockLevels();
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if ($levels['read'] < 1) {
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throw new Exception('Unable to stop read locking: not read locking.');
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}
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--$levels['read'];
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return $this;
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}
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public function stopWriteLocking() {
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$levels = &$this->getLockLevels();
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if ($levels['write'] < 1) {
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throw new Exception('Unable to stop read locking: not write locking.');
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}
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--$levels['write'];
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return $this;
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}
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protected function &getTransactionStack($key) {
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if (!self::$transactionShutdownRegistered) {
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self::$transactionShutdownRegistered = true;
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register_shutdown_function(
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array(
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'AphrontDatabaseConnection',
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'shutdownTransactionStacks',
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));
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}
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if (!isset(self::$transactionStacks[$key])) {
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self::$transactionStacks[$key] = array();
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}
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return self::$transactionStacks[$key];
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}
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public static function shutdownTransactionStacks() {
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foreach (self::$transactionStacks as $stack) {
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if ($stack === false) {
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continue;
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}
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$count = count($stack);
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if ($count) {
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throw new Exception(
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'Script exited with '.$count.' open transactions! The '.
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'transactions will be implicitly rolled back. Calls to '.
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'openTransaction() should always be paired with a call to '.
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'saveTransaction() or killTransaction(); you have an unpaired '.
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'call somewhere.',
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$count);
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}
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}
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}
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/**
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* Begin a transaction, or set a savepoint if the connection is already
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* transactional.
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*
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* @return this
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* @task xaction
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*/
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public function openTransaction() {
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$key = $this->getTransactionKey();
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$stack = &$this->getTransactionStack($key);
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$new_transaction = !count($stack);
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// TODO: At least in development, push context information instead of
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// `true' so we can report (or, at least, guess) where unpaired
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// transaction calls happened.
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$stack[] = true;
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end($stack);
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$key = key($stack);
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$state = $this->getTransactionState();
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$point = $state->getSavepointName();
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$depth = $state->increaseDepth();
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$new_transaction = ($depth == 1);
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if ($new_transaction) {
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$this->query('START TRANSACTION');
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} else {
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$this->query('SAVEPOINT '.$this->getSavepointName($key));
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$this->query('SAVEPOINT '.$point);
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}
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return $this;
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}
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public function isInsideTransaction() {
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$key = $this->getTransactionKey();
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$stack = &$this->getTransactionStack($key);
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return (bool)count($stack);
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}
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/**
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* Commit a transaction, or stage a savepoint for commit once the entire
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* transaction completes if inside a transaction stack.
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*
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* @return this
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* @task xaction
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*/
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public function saveTransaction() {
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$key = $this->getTransactionKey();
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$stack = &$this->getTransactionStack($key);
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$state = $this->getTransactionState();
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$depth = $state->decreaseDepth();
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if (!count($stack)) {
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throw new Exception(
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"No open transaction! Unable to save transaction, since there ".
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"isn't one.");
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}
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array_pop($stack);
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if (!count($stack)) {
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if ($depth == 0) {
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$this->query('COMMIT');
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}
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return $this;
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}
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public function saveTransactionUnless($cond) {
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if ($cond) {
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$this->killTransaction();
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} else {
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$this->saveTransaction();
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}
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}
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public function saveTransactionIf($cond) {
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$this->saveTransactionUnless(!$cond);
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}
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/**
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* Rollback a transaction, or unstage the last savepoint if inside a
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* transaction stack.
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*
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* @return this
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*/
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public function killTransaction() {
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$key = $this->getTransactionKey();
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$stack = &$this->getTransactionStack($key);
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$state = $this->getTransactionState();
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$depth = $state->decreaseDepth();
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if (!count($stack)) {
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throw new Exception(
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"No open transaction! Unable to kill transaction, since there ".
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"isn't one.");
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}
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$count = count($stack);
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end($stack);
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$key = key($stack);
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array_pop($stack);
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if (!count($stack)) {
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if ($depth == 0) {
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$this->query('ROLLBACK');
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} else {
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$this->query(
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'ROLLBACK TO SAVEPOINT '.$this->getSavepointName($key)
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);
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$this->query('ROLLBACK TO SAVEPOINT '.$state->getSavepointName());
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}
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return $this;
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}
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protected function getSavepointName($key) {
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return 'LiskSavepoint_'.$key;
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/**
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* Returns true if the connection is transactional.
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*
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* @return bool True if the connection is currently transactional.
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* @task xaction
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*/
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public function isInsideTransaction() {
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if ($this->initializingTransactionState) {
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return false;
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}
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$state = $this->getTransactionState();
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return ($state->getDepth() > 0);
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}
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/**
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* Get the current @{class:AphrontDatabaseTransactionState} object, or create
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* one if none exists.
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*
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* @return AphrontDatabaseTransactionState Current transaction state.
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* @task xaction
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*/
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protected function getTransactionState() {
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// Establishing a connection may be required to get the transaction key,
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// and may also perform a test for transaction state. While establishing
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// transaction state, avoid infinite recursion.
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$this->initializingTransactionState = true;
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$key = $this->getTransactionKey();
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if (empty(self::$transactionStates[$key])) {
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self::$transactionStates[$key] = new AphrontDatabaseTransactionState();
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}
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$this->initializingTransactionState = false;
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return self::$transactionStates[$key];
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}
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}
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@ -7,6 +7,7 @@
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phutil_require_module('phabricator', 'storage/queryfx');
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phutil_require_module('phabricator', 'storage/transaction');
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phutil_require_source('AphrontDatabaseConnection.php');
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@ -1,7 +1,7 @@
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<?php
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/*
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* Copyright 2011 Facebook, Inc.
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* Copyright 2012 Facebook, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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@ -24,6 +24,10 @@ class AphrontIsolatedDatabaseConnection extends AphrontDatabaseConnection {
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private $configuration;
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private static $nextInsertID;
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private $insertID;
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private static $nextTransactionKey = 1;
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private $transactionKey;
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private $transcript = array();
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public function __construct(array $configuration) {
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$this->configuration = $configuration;
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@ -33,6 +37,8 @@ class AphrontIsolatedDatabaseConnection extends AphrontDatabaseConnection {
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// collisions and make them distinctive.
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self::$nextInsertID = 55555000000 + mt_rand(0, 1000);
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}
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$this->transactionKey = 'iso-xaction-'.(self::$nextTransactionKey++);
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}
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public function escapeString($string) {
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@ -64,7 +70,7 @@ class AphrontIsolatedDatabaseConnection extends AphrontDatabaseConnection {
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}
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public function getTransactionKey() {
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return 'xaction'; // TODO, probably need to stub this better.
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return $this->transactionKey;
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}
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public function selectAllResults() {
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@ -74,17 +80,35 @@ class AphrontIsolatedDatabaseConnection extends AphrontDatabaseConnection {
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public function executeRawQuery($raw_query) {
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// NOTE: "[\s<>K]*" allows any number of (properly escaped) comments to
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// appear prior to the INSERT/UPDATE/DELETE, since this connection escapes
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// appear prior to the allowed keyword, since this connection escapes
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// them as "<K>" (above).
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if (!preg_match('/^[\s<>K]*(INSERT|UPDATE|DELETE)\s*/i', $raw_query)) {
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$keywords = array(
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'INSERT',
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'UPDATE',
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'DELETE',
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'START',
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'SAVEPOINT',
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'COMMIT',
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'ROLLBACK',
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);
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$preg_keywords = array();
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foreach ($keywords as $key => $word) {
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$preg_keywords[] = preg_quote($word, '/');
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}
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$preg_keywords = implode('|', $preg_keywords);
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if (!preg_match('/^[\s<>K]*('.$preg_keywords.')\s*/i', $raw_query)) {
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$doc_uri = PhabricatorEnv::getDoclink('article/Writing_Unit_Tests.html');
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throw new Exception(
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"Database isolation currently only supports INSERT, UPDATE and DELETE ".
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"queries. For more information, see <{$doc_uri}>. You are trying to ".
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"issue a query which does not begin with INSERT, UPDATE or DELETE: ".
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"'".$raw_query."'");
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"Database isolation currently only supports some queries. For more ".
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"information, see <{$doc_uri}>. You are trying to issue a query which ".
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"does not begin with an allowed keyword ".
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"(".implode(', ', $keywords)."): '".$raw_query."'");
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}
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$this->transcript[] = $raw_query;
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// NOTE: This method is intentionally simplified for now, since we're only
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// using it to stub out inserts/updates. In the future it will probably need
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// to grow more powerful.
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@ -99,4 +123,8 @@ class AphrontIsolatedDatabaseConnection extends AphrontDatabaseConnection {
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$this->affectedRows = 1;
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}
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public function getQueryTranscript() {
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return $this->transcript;
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}
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}
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@ -1,7 +1,7 @@
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<?php
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/*
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* Copyright 2011 Facebook, Inc.
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* Copyright 2012 Facebook, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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@ -30,27 +30,14 @@ class AphrontIsolatedDatabaseConnectionTestCase
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public function testIsolation() {
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$conn = $this->newIsolatedConnection();
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$test_phid = 'PHID-TEST-'.Filesystem::readRandomCharacters(20);
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$test_phid = $this->generateTestPHID();
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queryfx(
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$conn,
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'INSERT INTO phabricator_phid.phid (phid) VALUES (%s)',
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$test_phid);
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try {
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$real_phid = id(new PhabricatorPHID())->loadOneWhere(
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'phid = %s',
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$test_phid);
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$this->assertEqual(
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null,
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$real_phid,
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'Expect fake PHID to exist only in isolation.');
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} catch (AphrontQueryConnectionException $ex) {
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// If we can't connect to the database, conclude that the isolated
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// connection actually is isolated. Philosophically, this perhaps allows
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// us to claim this test does not depend on the database?
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}
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$this->assertNoSuchPHID($test_phid);
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}
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public function testInsertGeneratesID() {
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@ -75,8 +62,103 @@ class AphrontIsolatedDatabaseConnectionTestCase
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queryfx($conn, 'DELETE');
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}
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public function testTransactionStack() {
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$conn = $this->newIsolatedConnection();
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$conn->openTransaction();
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queryfx($conn, 'INSERT');
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$conn->saveTransaction();
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$this->assertEqual(
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array(
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'START TRANSACTION',
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'INSERT',
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'COMMIT',
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),
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$conn->getQueryTranscript());
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$conn = $this->newIsolatedConnection();
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$conn->openTransaction();
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queryfx($conn, 'INSERT 1');
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$conn->openTransaction();
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queryfx($conn, 'INSERT 2');
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$conn->killTransaction();
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$conn->openTransaction();
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queryfx($conn, 'INSERT 3');
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$conn->openTransaction();
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queryfx($conn, 'INSERT 4');
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$conn->saveTransaction();
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$conn->saveTransaction();
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$conn->openTransaction();
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queryfx($conn, 'INSERT 5');
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$conn->killTransaction();
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queryfx($conn, 'INSERT 6');
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$conn->saveTransaction();
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$this->assertEqual(
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array(
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'START TRANSACTION',
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'INSERT 1',
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'SAVEPOINT Aphront_Savepoint_1',
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'INSERT 2',
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'ROLLBACK TO SAVEPOINT Aphront_Savepoint_1',
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'SAVEPOINT Aphront_Savepoint_1',
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'INSERT 3',
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'SAVEPOINT Aphront_Savepoint_2',
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'INSERT 4',
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'SAVEPOINT Aphront_Savepoint_1',
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'INSERT 5',
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'ROLLBACK TO SAVEPOINT Aphront_Savepoint_1',
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'INSERT 6',
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'COMMIT',
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),
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$conn->getQueryTranscript());
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}
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public function testTransactionRollback() {
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$check = array();
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$phid = new PhabricatorPHID();
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$phid->openTransaction();
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for ($ii = 0; $ii < 3; $ii++) {
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$test_phid = $this->generateTestPHID();
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$obj = new PhabricatorPHID();
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$obj->setPHID($test_phid);
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$obj->setPHIDType('TEST');
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$obj->setOwnerPHID('PHID-UNIT-!!!!');
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$obj->save();
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$check[] = $test_phid;
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}
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$phid->killTransaction();
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foreach ($check as $test_phid) {
|
||||
$this->assertNoSuchPHID($test_phid);
|
||||
}
|
||||
}
|
||||
|
||||
private function newIsolatedConnection() {
|
||||
$config = array();
|
||||
return new AphrontIsolatedDatabaseConnection($config);
|
||||
}
|
||||
|
||||
private function generateTestPHID() {
|
||||
return 'PHID-TEST-'.Filesystem::readRandomCharacters(20);
|
||||
}
|
||||
|
||||
private function assertNoSuchPHID($phid) {
|
||||
try {
|
||||
$real_phid = id(new PhabricatorPHID())->loadOneWhere(
|
||||
'phid = %s',
|
||||
$phid);
|
||||
$this->assertEqual(
|
||||
null,
|
||||
$real_phid,
|
||||
'Expect fake PHID to exist only in isolation.');
|
||||
} catch (AphrontQueryConnectionException $ex) {
|
||||
// If we can't connect to the database, conclude that the isolated
|
||||
// connection actually is isolated. Philosophically, this perhaps allows
|
||||
// us to claim this test does not depend on the database?
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
|
|
|
|||
|
|
@ -107,16 +107,17 @@ class AphrontMySQLDatabaseConnection extends AphrontDatabaseConnection {
|
|||
private function establishConnection() {
|
||||
$this->closeConnection();
|
||||
|
||||
$user = $this->getConfiguration('user');
|
||||
$host = $this->getConfiguration('host');
|
||||
$database = $this->getConfiguration('database');
|
||||
|
||||
$key = $this->getConnectionCacheKey();
|
||||
if (isset(self::$connectionCache[$key])) {
|
||||
$this->connection = self::$connectionCache[$key];
|
||||
return;
|
||||
}
|
||||
|
||||
if ($this->isInsideTransaction()) {
|
||||
throw new Exception(
|
||||
"Connection was lost inside a transaction! Recovery is impossible.");
|
||||
}
|
||||
|
||||
$start = microtime(true);
|
||||
|
||||
if (!function_exists('mysql_connect')) {
|
||||
|
|
@ -129,6 +130,11 @@ class AphrontMySQLDatabaseConnection extends AphrontDatabaseConnection {
|
|||
"available!");
|
||||
}
|
||||
|
||||
$user = $this->getConfiguration('user');
|
||||
$host = $this->getConfiguration('host');
|
||||
$database = $this->getConfiguration('database');
|
||||
|
||||
|
||||
$profiler = PhutilServiceProfiler::getInstance();
|
||||
$call_id = $profiler->beginServiceCall(
|
||||
array(
|
||||
|
|
|
|||
|
|
@ -1,7 +1,7 @@
|
|||
<?php
|
||||
|
||||
/*
|
||||
* Copyright 2011 Facebook, Inc.
|
||||
* Copyright 2012 Facebook, Inc.
|
||||
*
|
||||
* Licensed under the Apache License, Version 2.0 (the "License");
|
||||
* you may not use this file except in compliance with the License.
|
||||
|
|
@ -135,12 +135,37 @@
|
|||
* loadAllWhere() returns a list of objects, while loadOneWhere() returns a
|
||||
* single object (or null).
|
||||
*
|
||||
* = Managing Transactions =
|
||||
*
|
||||
* Lisk uses a transaction stack, so code does not generally need to be aware
|
||||
* of the transactional state of objects to implement correct transaction
|
||||
* semantics:
|
||||
*
|
||||
* $obj->openTransaction();
|
||||
* $obj->save();
|
||||
* $other->save();
|
||||
* // ...
|
||||
* $other->openTransaction();
|
||||
* $other->save();
|
||||
* $another->save();
|
||||
* if ($some_condition) {
|
||||
* $other->saveTransaction();
|
||||
* } else {
|
||||
* $other->killTransaction();
|
||||
* }
|
||||
* // ...
|
||||
* $obj->saveTransaction();
|
||||
*
|
||||
* Assuming ##$obj##, ##$other## and ##$another## live on the same database,
|
||||
* this code will work correctly by establishing savepoints.
|
||||
*
|
||||
* @task config Configuring Lisk
|
||||
* @task load Loading Objects
|
||||
* @task info Examining Objects
|
||||
* @task save Writing Objects
|
||||
* @task hook Hooks and Callbacks
|
||||
* @task util Utilities
|
||||
* @task xaction Managing Transactions
|
||||
* @task isolate Isolation for Unit Testing
|
||||
*
|
||||
* @group storage
|
||||
|
|
@ -454,11 +479,16 @@ abstract class LiskDAO {
|
|||
$connection = $this->establishConnection('r');
|
||||
|
||||
$lock_clause = '';
|
||||
/*
|
||||
|
||||
TODO: Restore this?
|
||||
|
||||
if ($connection->isReadLocking()) {
|
||||
$lock_clause = 'FOR UPDATE';
|
||||
} else if ($connection->isWriteLocking()) {
|
||||
$lock_clause = 'LOCK IN SHARE MODE';
|
||||
}
|
||||
*/
|
||||
|
||||
$args = func_get_args();
|
||||
$args = array_slice($args, 2);
|
||||
|
|
@ -1165,6 +1195,42 @@ abstract class LiskDAO {
|
|||
}
|
||||
|
||||
|
||||
/* -( Manging Transactions )----------------------------------------------- */
|
||||
|
||||
|
||||
/**
|
||||
* Increase transaction stack depth.
|
||||
*
|
||||
* @return this
|
||||
*/
|
||||
public function openTransaction() {
|
||||
$this->establishConnection('w')->openTransaction();
|
||||
return $this;
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Decrease transaction stack depth, saving work.
|
||||
*
|
||||
* @return this
|
||||
*/
|
||||
public function saveTransaction() {
|
||||
$this->establishConnection('w')->saveTransaction();
|
||||
return $this;
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Decrease transaction stack depth, discarding work.
|
||||
*
|
||||
* @return this
|
||||
*/
|
||||
public function killTransaction() {
|
||||
$this->establishConnection('w')->killTransaction();
|
||||
return $this;
|
||||
}
|
||||
|
||||
|
||||
/* -( Isolation )---------------------------------------------------------- */
|
||||
|
||||
/**
|
||||
|
|
|
|||
58
src/storage/transaction/AphrontDatabaseTransactionState.php
Normal file
58
src/storage/transaction/AphrontDatabaseTransactionState.php
Normal file
|
|
@ -0,0 +1,58 @@
|
|||
<?php
|
||||
|
||||
/*
|
||||
* Copyright 2012 Facebook, Inc.
|
||||
*
|
||||
* Licensed under the Apache License, Version 2.0 (the "License");
|
||||
* you may not use this file except in compliance with the License.
|
||||
* You may obtain a copy of the License at
|
||||
*
|
||||
* http://www.apache.org/licenses/LICENSE-2.0
|
||||
*
|
||||
* Unless required by applicable law or agreed to in writing, software
|
||||
* distributed under the License is distributed on an "AS IS" BASIS,
|
||||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
* See the License for the specific language governing permissions and
|
||||
* limitations under the License.
|
||||
*/
|
||||
|
||||
/**
|
||||
* Represents current transaction state of a connection.
|
||||
*
|
||||
* @group storage
|
||||
*/
|
||||
final class AphrontDatabaseTransactionState {
|
||||
|
||||
private $depth;
|
||||
|
||||
public function getDepth() {
|
||||
return $this->depth;
|
||||
}
|
||||
|
||||
public function increaseDepth() {
|
||||
return ++$this->depth;
|
||||
}
|
||||
|
||||
public function decreaseDepth() {
|
||||
if ($this->depth == 0) {
|
||||
throw new Exception(
|
||||
'Too many calls to saveTransaction() or killTransaction()!');
|
||||
}
|
||||
|
||||
return --$this->depth;
|
||||
}
|
||||
|
||||
public function getSavepointName() {
|
||||
return 'Aphront_Savepoint_'.$this->depth;
|
||||
}
|
||||
|
||||
public function __destruct() {
|
||||
if ($this->depth) {
|
||||
throw new Exception(
|
||||
'Process exited with an open transaction! The transaction will be '.
|
||||
'implicitly rolled back. Calls to openTransaction() must always be '.
|
||||
'paired with a call to saveTransaction() or killTransaction().');
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
10
src/storage/transaction/__init__.php
Normal file
10
src/storage/transaction/__init__.php
Normal file
|
|
@ -0,0 +1,10 @@
|
|||
<?php
|
||||
/**
|
||||
* This file is automatically generated. Lint this module to rebuild it.
|
||||
* @generated
|
||||
*/
|
||||
|
||||
|
||||
|
||||
|
||||
phutil_require_source('AphrontDatabaseTransactionState.php');
|
||||
Loading…
Reference in a new issue