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Add our own DB exception abstraction
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Right now our API exports the Doctrine/dbal exception. As we've seen
with the dbal 3 upgrade, the leakage of 3rdparty types is problematic as
a dependency update means lots of work in apps, due to the direct
dependency of what Nextcloud ships. This breaks this dependency so that
apps only need to depend on our public API. That API can then be vendor
(db lib) agnostic and we can work around future deprecations/removals in
dbal more easily.

Right now the type of exception thrown is transported as "reason". For
the more popular types of errors we can extend the new exception class
and allow apps to catch specific errors only. Right now they have to
catch-check-rethrow. This is not ideal, but better than the dependnecy
on dbal.

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>
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@ChristophWurst
ChristophWurst committed Jan 12, 2021
1 parent c8cbb73 commit 2c9cdc1
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Showing 10 changed files with 439 additions and 27 deletions.
2 changes: 2 additions & 0 deletions lib/composer/composer/autoload_classmap.php
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Expand Up @@ -161,6 +161,7 @@
'OCP\\Contacts\\ContactsMenu\\IProvider' => $baseDir . '/lib/public/Contacts/ContactsMenu/IProvider.php',
'OCP\\Contacts\\Events\\ContactInteractedWithEvent' => $baseDir . '/lib/public/Contacts/Events/ContactInteractedWithEvent.php',
'OCP\\Contacts\\IManager' => $baseDir . '/lib/public/Contacts/IManager.php',
'OCP\\DB\\Exception' => $baseDir . '/lib/public/DB/Exception.php',
'OCP\\DB\\IPreparedStatement' => $baseDir . '/lib/public/DB/IPreparedStatement.php',
'OCP\\DB\\IResult' => $baseDir . '/lib/public/DB/IResult.php',
'OCP\\DB\\ISchemaWrapper' => $baseDir . '/lib/public/DB/ISchemaWrapper.php',
Expand Down Expand Up @@ -952,6 +953,7 @@
'OC\\DB\\Connection' => $baseDir . '/lib/private/DB/Connection.php',
'OC\\DB\\ConnectionAdapter' => $baseDir . '/lib/private/DB/ConnectionAdapter.php',
'OC\\DB\\ConnectionFactory' => $baseDir . '/lib/private/DB/ConnectionFactory.php',
'OC\\DB\\Exceptions\\DbalException' => $baseDir . '/lib/private/DB/Exceptions/DbalException.php',
'OC\\DB\\MDB2SchemaManager' => $baseDir . '/lib/private/DB/MDB2SchemaManager.php',
'OC\\DB\\MDB2SchemaReader' => $baseDir . '/lib/private/DB/MDB2SchemaReader.php',
'OC\\DB\\MigrationException' => $baseDir . '/lib/private/DB/MigrationException.php',
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2 changes: 2 additions & 0 deletions lib/composer/composer/autoload_static.php
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Expand Up @@ -190,6 +190,7 @@ class ComposerStaticInit53792487c5a8370acc0b06b1a864ff4c
'OCP\\Contacts\\ContactsMenu\\IProvider' => __DIR__ . '/../../..' . '/lib/public/Contacts/ContactsMenu/IProvider.php',
'OCP\\Contacts\\Events\\ContactInteractedWithEvent' => __DIR__ . '/../../..' . '/lib/public/Contacts/Events/ContactInteractedWithEvent.php',
'OCP\\Contacts\\IManager' => __DIR__ . '/../../..' . '/lib/public/Contacts/IManager.php',
'OCP\\DB\\Exception' => __DIR__ . '/../../..' . '/lib/public/DB/Exception.php',
'OCP\\DB\\IPreparedStatement' => __DIR__ . '/../../..' . '/lib/public/DB/IPreparedStatement.php',
'OCP\\DB\\IResult' => __DIR__ . '/../../..' . '/lib/public/DB/IResult.php',
'OCP\\DB\\ISchemaWrapper' => __DIR__ . '/../../..' . '/lib/public/DB/ISchemaWrapper.php',
Expand Down Expand Up @@ -981,6 +982,7 @@ class ComposerStaticInit53792487c5a8370acc0b06b1a864ff4c
'OC\\DB\\Connection' => __DIR__ . '/../../..' . '/lib/private/DB/Connection.php',
'OC\\DB\\ConnectionAdapter' => __DIR__ . '/../../..' . '/lib/private/DB/ConnectionAdapter.php',
'OC\\DB\\ConnectionFactory' => __DIR__ . '/../../..' . '/lib/private/DB/ConnectionFactory.php',
'OC\\DB\\Exceptions\\DbalException' => __DIR__ . '/../../..' . '/lib/private/DB/Exceptions/DbalException.php',
'OC\\DB\\MDB2SchemaManager' => __DIR__ . '/../../..' . '/lib/private/DB/MDB2SchemaManager.php',
'OC\\DB\\MDB2SchemaReader' => __DIR__ . '/../../..' . '/lib/private/DB/MDB2SchemaReader.php',
'OC\\DB\\MigrationException' => __DIR__ . '/../../..' . '/lib/private/DB/MigrationException.php',
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10 changes: 9 additions & 1 deletion lib/private/DB/Adapter.php
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Expand Up @@ -30,6 +30,7 @@

namespace OC\DB;

use Doctrine\DBAL\Exception;
use Doctrine\DBAL\Exception\UniqueConstraintViolationException;

/**
Expand All @@ -49,7 +50,9 @@ public function __construct($conn) {

/**
* @param string $table name
*
* @return int id of last insert statement
* @throws Exception
*/
public function lastInsertId($table) {
return (int) $this->conn->realLastInsertId($table);
Expand All @@ -67,6 +70,7 @@ public function fixupStatement($statement) {
* Create an exclusive read+write lock on a table
*
* @param string $tableName
* @throws Exception
* @since 9.1.0
*/
public function lockTable($tableName) {
Expand All @@ -77,6 +81,7 @@ public function lockTable($tableName) {
/**
* Release a previous acquired lock again
*
* @throws Exception
* @since 9.1.0
*/
public function unlockTable() {
Expand All @@ -94,7 +99,7 @@ public function unlockTable() {
* If this is null or an empty array, all keys of $input will be compared
* Please note: text fields (clob) must not be used in the compare array
* @return int number of inserted rows
* @throws \Doctrine\DBAL\Exception
* @throws Exception
* @deprecated 15.0.0 - use unique index and "try { $db->insert() } catch (UniqueConstraintViolationException $e) {}" instead, because it is more reliable and does not have the risk for deadlocks - see https://github.com/nextcloud/server/pull/12371
*/
public function insertIfNotExist($table, $input, array $compare = null) {
Expand Down Expand Up @@ -130,6 +135,9 @@ public function insertIfNotExist($table, $input, array $compare = null) {
}
}

/**
* @throws \OCP\DB\Exception
*/
public function insertIgnoreConflict(string $table,array $values) : int {
try {
$builder = $this->conn->getQueryBuilder();
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25 changes: 24 additions & 1 deletion lib/private/DB/Connection.php
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Expand Up @@ -74,6 +74,9 @@ class Connection extends ReconnectWrapper {
/** @var int */
protected $queriesExecuted = 0;

/**
* @throws Exception
*/
public function connect() {
try {
return parent::connect();
Expand Down Expand Up @@ -183,7 +186,9 @@ public function __construct(array $params, Driver $driver, Configuration $config
* @param string $statement The SQL statement to prepare.
* @param int $limit
* @param int $offset
*
* @return Statement The prepared statement.
* @throws Exception
*/
public function prepare($statement, $limit = null, $offset = null): Statement {
if ($limit === -1) {
Expand Down Expand Up @@ -221,6 +226,9 @@ public function executeQuery(string $sql, array $params = [], $types = [], Query
return parent::executeQuery($sql, $params, $types, $qcp);
}

/**
* @throws Exception
*/
public function executeUpdate(string $sql, array $params = [], array $types = []): int {
$sql = $this->replaceTablePrefix($sql);
$sql = $this->adapter->fixupStatement($sql);
Expand Down Expand Up @@ -258,7 +266,9 @@ public function executeStatement($sql, array $params = [], array $types = []): i
* columns or sequences.
*
* @param string $seqName Name of the sequence object from which the ID should be returned.
*
* @return string the last inserted ID.
* @throws Exception
*/
public function lastInsertId($seqName = null) {
if ($seqName) {
Expand All @@ -267,7 +277,10 @@ public function lastInsertId($seqName = null) {
return $this->adapter->lastInsertId($seqName);
}

// internal use
/**
* @internal
* @throws Exception
*/
public function realLastInsertId($seqName = null) {
return parent::lastInsertId($seqName);
}
Expand Down Expand Up @@ -364,7 +377,9 @@ public function setValues($table, array $keys, array $values, array $updatePreco
* Create an exclusive read+write lock on a table
*
* @param string $tableName
*
* @throws \BadMethodCallException When trying to acquire a second lock
* @throws Exception
* @since 9.1.0
*/
public function lockTable($tableName) {
Expand All @@ -380,6 +395,7 @@ public function lockTable($tableName) {
/**
* Release a previous acquired lock again
*
* @throws Exception
* @since 9.1.0
*/
public function unlockTable() {
Expand Down Expand Up @@ -415,6 +431,8 @@ public function errorInfo() {
* Drop a table from the database if it exists
*
* @param string $table table name without the prefix
*
* @throws Exception
*/
public function dropTable($table) {
$table = $this->tablePrefix . trim($table);
Expand All @@ -428,7 +446,9 @@ public function dropTable($table) {
* Check if a table exists
*
* @param string $table table name without the prefix
*
* @return bool
* @throws Exception
*/
public function tableExists($table) {
$table = $this->tablePrefix . trim($table);
Expand Down Expand Up @@ -483,6 +503,7 @@ public function supports4ByteText() {
* Create the schema of the connected database
*
* @return Schema
* @throws Exception
*/
public function createSchema() {
$schemaManager = new MDB2SchemaManager($this);
Expand All @@ -494,6 +515,8 @@ public function createSchema() {
* Migrate the database to the given schema
*
* @param Schema $toSchema
*
* @throws Exception
*/
public function migrateToSchema(Schema $toSchema) {
$schemaManager = new MDB2SchemaManager($this);
Expand Down
118 changes: 96 additions & 22 deletions lib/private/DB/ConnectionAdapter.php
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Original file line number Diff line number Diff line change
Expand Up @@ -25,8 +25,10 @@

namespace OC\DB;

use Doctrine\DBAL\Exception;
use Doctrine\DBAL\Platforms\AbstractPlatform;
use Doctrine\DBAL\Schema\Schema;
use OC\DB\Exceptions\DbalException;
use OCP\DB\IPreparedStatement;
use OCP\DB\IResult;
use OCP\DB\QueryBuilder\IQueryBuilder;
Expand All @@ -49,63 +51,115 @@ public function getQueryBuilder(): IQueryBuilder {
}

public function prepare($sql, $limit = null, $offset = null): IPreparedStatement {
return new PreparedStatement(
$this->inner->prepare($sql, $limit, $offset)
);
try {
return new PreparedStatement(
$this->inner->prepare($sql, $limit, $offset)
);
} catch (Exception $e) {
throw DbalException::wrap($e);
}
}

public function executeQuery(string $sql, array $params = [], $types = []): IResult {
return new ResultAdapter(
$this->inner->executeQuery($sql, $params, $types)
);
try {
return new ResultAdapter(
$this->inner->executeQuery($sql, $params, $types)
);
} catch (Exception $e) {
throw DbalException::wrap($e);
}
}

public function executeUpdate(string $sql, array $params = [], array $types = []): int {
return $this->inner->executeUpdate($sql, $params, $types);
try {
return $this->inner->executeUpdate($sql, $params, $types);
} catch (Exception $e) {
throw DbalException::wrap($e);
}
}

public function executeStatement($sql, array $params = [], array $types = []): int {
return $this->inner->executeStatement($sql, $params, $types);
try {
return $this->inner->executeStatement($sql, $params, $types);
} catch (Exception $e) {
throw DbalException::wrap($e);
}
}

public function lastInsertId(string $table): int {
return (int) $this->inner->lastInsertId($table);
try {
return (int)$this->inner->lastInsertId($table);
} catch (Exception $e) {
throw DbalException::wrap($e);
}
}

public function insertIfNotExist(string $table, array $input, array $compare = null) {
return $this->inner->insertIfNotExist($table, $input, $compare);
try {
return $this->inner->insertIfNotExist($table, $input, $compare);
} catch (Exception $e) {
throw DbalException::wrap($e);
}
}

public function insertIgnoreConflict(string $table, array $values): int {
return $this->inner->insertIgnoreConflict($table, $values);
try {
return $this->inner->insertIgnoreConflict($table, $values);
} catch (Exception $e) {
throw DbalException::wrap($e);
}
}

public function setValues($table, array $keys, array $values, array $updatePreconditionValues = []): int {
return $this->inner->setValues($table, $keys, $values, $updatePreconditionValues);
try {
return $this->inner->setValues($table, $keys, $values, $updatePreconditionValues);
} catch (Exception $e) {
throw DbalException::wrap($e);
}
}

public function lockTable($tableName): void {
$this->inner->lockTable($tableName);
try {
$this->inner->lockTable($tableName);
} catch (Exception $e) {
throw DbalException::wrap($e);
}
}

public function unlockTable(): void {
$this->inner->unlockTable();
try {
$this->inner->unlockTable();
} catch (Exception $e) {
throw DbalException::wrap($e);
}
}

public function beginTransaction(): void {
$this->inner->beginTransaction();
try {
$this->inner->beginTransaction();
} catch (Exception $e) {
throw DbalException::wrap($e);
}
}

public function inTransaction(): bool {
return $this->inner->inTransaction();
}

public function commit(): void {
$this->inner->commit();
try {
$this->inner->commit();
} catch (Exception $e) {
throw DbalException::wrap($e);
}
}

public function rollBack(): void {
$this->inner->rollBack();
try {
$this->inner->rollBack();
} catch (Exception $e) {
throw DbalException::wrap($e);
}
}

public function getError(): string {
Expand All @@ -121,7 +175,11 @@ public function errorInfo() {
}

public function connect(): bool {
return $this->inner->connect();
try {
return $this->inner->connect();
} catch (Exception $e) {
throw DbalException::wrap($e);
}
}

public function close(): void {
Expand All @@ -140,11 +198,19 @@ public function getDatabasePlatform(): AbstractPlatform {
}

public function dropTable(string $table): void {
$this->inner->dropTable($table);
try {
$this->inner->dropTable($table);
} catch (Exception $e) {
throw DbalException::wrap($e);
}
}

public function tableExists(string $table): bool {
return $this->inner->tableExists($table);
try {
return $this->inner->tableExists($table);
} catch (Exception $e) {
throw DbalException::wrap($e);
}
}

public function escapeLikeParameter(string $param): string {
Expand All @@ -159,11 +225,19 @@ public function supports4ByteText(): bool {
* @todo leaks a 3rdparty type
*/
public function createSchema(): Schema {
return $this->inner->createSchema();
try {
return $this->inner->createSchema();
} catch (Exception $e) {
throw DbalException::wrap($e);
}
}

public function migrateToSchema(Schema $toSchema): void {
$this->inner->migrateToSchema($toSchema);
try {
$this->inner->migrateToSchema($toSchema);
} catch (Exception $e) {
throw DbalException::wrap($e);
}
}

public function getInner(): Connection {
Expand Down
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