feat: add request id as comment to all queries

Signed-off-by: Robin Appelman <robin@icewind.nl>

config/config.sample.php

@@ -159,6 +159,13 @@
 	['user' => 'nextcloud', 'password' => 'password2', 'host' => 'replica2', 'dbname' => ''],
 ],
 
+/**
+ * Add request id to the database query in a comment.
+ *
+ * This can be enabled to assist in mapping database logs to Nextcloud logs.
+ */
+'db.log_request_id' => false,
+
 /**
  * Indicates whether the Nextcloud instance was installed successfully; ``true``
  * indicates a successful installation, and ``false`` indicates an unsuccessful
@@ -1965,7 +1972,7 @@
 /**
  * Blacklist characters from being used in filenames. This is useful if you
  * have a filesystem or OS which does not support certain characters like windows.
- * 
+ *
  * The '/' and '\' characters are always forbidden.
  *
  * Example for windows systems: ``array('?', '<', '>', ':', '*', '|', '"', chr(0), "\n", "\r")``
@@ -2311,7 +2318,7 @@
 /**
  * Timeout for the login form, after this time the login form is reset.
  * This prevents password leaks on public devices if the user forgots to clear the form.
- * 
+ *
  * Default is 5 minutes (300 seconds), a value of 0 means no timeout.
  */
 'login_form_timeout' => 300,

lib/private/DB/Connection.php

@@ -91,6 +91,9 @@ class Connection extends PrimaryReadReplicaConnection {
 	/** @var array<string, int> */
 	protected $tableDirtyWrites = [];
 
+	protected bool $logRequestId;
+	protected string $requestId;
+
 	/**
 	 * Initializes a new instance of the Connection class.
 	 *
@@ -119,6 +122,9 @@ public function __construct(
 		$this->clock = Server::get(ClockInterface::class);
 		$this->logger = Server::get(LoggerInterface::class);
 
+		$this->logRequestId = $this->systemConfig->getValue('db.log_request_id', false);
+		$this->requestId = Server::get(IRequestId::class)->getId();
+
 		/** @var \OCP\Profiler\IProfiler */
 		$profiler = Server::get(IProfiler::class);
 		if ($profiler->isEnabled()) {
@@ -249,8 +255,7 @@ public function prepare($sql, $limit = null, $offset = null): Statement {
 			$platform = $this->getDatabasePlatform();
 			$sql = $platform->modifyLimitQuery($sql, $limit, $offset);
 		}
-		$statement = $this->replaceTablePrefix($sql);
-		$statement = $this->adapter->fixupStatement($statement);
+		$statement = $this->finishQuery($sql);
 
 		return parent::prepare($statement);
 	}
@@ -307,8 +312,7 @@ public function executeQuery(string $sql, array $params = [], $types = [], ?Quer
 			$this->ensureConnectedToPrimary();
 		}
 
-		$sql = $this->replaceTablePrefix($sql);
-		$sql = $this->adapter->fixupStatement($sql);
+		$sql = $this->finishQuery($sql);
 		$this->queriesExecuted++;
 		$this->logQueryToFile($sql);
 		return parent::executeQuery($sql, $params, $types, $qcp);
@@ -328,8 +332,7 @@ private function getQueriedTables(string $sql): array {
 	 * @throws Exception
 	 */
 	public function executeUpdate(string $sql, array $params = [], array $types = []): int {
-		$sql = $this->replaceTablePrefix($sql);
-		$sql = $this->adapter->fixupStatement($sql);
+		$sql = $this->finishQuery($sql);
 		$this->queriesExecuted++;
 		$this->logQueryToFile($sql);
 		return parent::executeUpdate($sql, $params, $types);
@@ -354,8 +357,7 @@ public function executeStatement($sql, array $params = [], array $types = []): i
 		foreach ($tables as $table) {
 			$this->tableDirtyWrites[$table] = $this->clock->now()->getTimestamp();
 		}
-		$sql = $this->replaceTablePrefix($sql);
-		$sql = $this->adapter->fixupStatement($sql);
+		$sql = $this->finishQuery($sql);
 		$this->queriesExecuted++;
 		$this->logQueryToFile($sql);
 		return (int)parent::executeStatement($sql, $params, $types);
@@ -587,6 +589,12 @@ public function tableExists($table) {
 		return $schema->tablesExist([$table]);
 	}
 
+	protected function finishQuery(string $statement): string {
+		$statement = $this->replaceTablePrefix($statement);
+		$statement = $this->adapter->fixupStatement($statement);
+		return $statement . " /* reqid: " . $this->requestId . " */";
+	}
+
 	// internal use
 	/**
 	 * @param string $statement