Airship\Engine\Database::beginTransaction PHP Method

    public function beginTransaction() : bool
    {
        return $this->pdo->beginTransaction();
    }

 /**
  * Insert/delete entries in supplier_keys, while updating the database.
  *
  * Dear future security auditors: This is important.
  *
  * @param Channel $chan)
  * @param TreeUpdate[] $updates
  * @return bool
  */
 protected function processTreeUpdates(Channel $chan, TreeUpdate ...$updates) : bool
 {
     $this->db->beginTransaction();
     foreach ($updates as $update) {
         // Insert the new node in the database:
         $treeUpdateID = (int) $this->db->insertGet('airship_tree_updates', ['channel' => $chan->getName(), 'channelupdateid' => $update->getChannelId(), 'data' => $update->getNodeJSON(), 'merkleroot' => $update->getRoot()], 'treeupdateid');
         // Update the JSON files separately:
         if ($update->isCreateKey()) {
             $this->insertKey($chan, $update);
             self::$continuumLogger->store(LogLevel::INFO, 'New public key', ['action' => 'KEYGGDRASIL', 'supplier' => $update->getSupplierName(), 'publicKey' => $update->getPublicKeyString(), 'merkleRoot' => $update->getRoot(), 'data' => $this->getLogData($update)]);
         } elseif ($update->isRevokeKey()) {
             $this->revokeKey($chan, $update);
             self::$continuumLogger->store(LogLevel::INFO, 'Public key revoked', ['action' => 'KEYGGDRASIL', 'supplier' => $update->getSupplierName(), 'publicKey' => $update->getPublicKeyString(), 'merkleRoot' => $update->getRoot(), 'data' => $this->getLogData($update)]);
         } else {
             $this->updatePackageQueue($update, $treeUpdateID);
             self::$continuumLogger->store(LogLevel::INFO, 'New package metadata', ['action' => 'KEYGGDRASIL', 'supplier' => $update->getSupplierName(), 'merkleRoot' => $update->getRoot(), 'data' => $this->getLogData($update)]);
         }
     }
     return $this->db->commit();
 }