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 @@ $CONFIG = [
 	['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

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 @@ class Connection extends PrimaryReadReplicaConnection {
 		$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 @@ class Connection extends PrimaryReadReplicaConnection {
 			$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 @@ class Connection extends PrimaryReadReplicaConnection {
 			$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 @@ class Connection extends PrimaryReadReplicaConnection {
 	 * @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, $types);
@@ -354,8 +357,7 @@ class Connection extends PrimaryReadReplicaConnection {
 		foreach ($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 +589,16 @@ class Connection extends PrimaryReadReplicaConnection {
 		return $schema->tablesExist([$table]);
 	}
 
+	protected function finishQuery(string $statement): string {
+		$statement = $this->replaceTablePrefix($statement);
+		$statement = $this->adapter->fixupStatement($statement);
+		if ($this->logRequestId) {
+			return $statement . " /* reqid: " . $this->requestId . " */";
+		} else {
+			return $statement;
+		}
+	}
+
 	// internal use
 	/**
 	 * @param string $statement