MatcherDumper.php

<?php

namespace Drupal\Core\Routing;

use Drupal\Core\Database\DatabaseException;
use Drupal\Core\State\StateInterface;
use Symfony\Component\Routing\RouteCollection;
use Drupal\Core\Database\Connection;

/**
 * Dumps Route information to a database table.
 *
 * @see \Drupal\Core\Routing\RouteProvider
 */
class MatcherDumper implements MatcherDumperInterface {
    
    /**
     * The database connection to which to dump route information.
     *
     * @var \Drupal\Core\Database\Connection
     */
    protected $connection;
    
    /**
     * The routes to be dumped.
     *
     * @var \Symfony\Component\Routing\RouteCollection
     */
    protected $routes;
    
    /**
     * The state.
     *
     * @var \Drupal\Core\State\StateInterface
     */
    protected $state;
    
    /**
     * The name of the SQL table to which to dump the routes.
     *
     * @var string
     */
    protected $tableName;
    
    /**
     * Construct the MatcherDumper.
     *
     * @param \Drupal\Core\Database\Connection $connection
     *   The database connection which will be used to store the route
     *   information.
     * @param \Drupal\Core\State\StateInterface $state
     *   The state.
     * @param string $table
     *   (optional) The table to store the route info in. Defaults to 'router'.
     */
    public function __construct(Connection $connection, StateInterface $state, $table = 'router') {
        $this->connection = $connection;
        $this->state = $state;
        $this->tableName = $table;
    }
    
    /**
     * {@inheritdoc}
     */
    public function addRoutes(RouteCollection $routes) {
        if (empty($this->routes)) {
            $this->routes = $routes;
        }
        else {
            $this->routes
                ->addCollection($routes);
        }
    }
    
    /**
     * Dumps a set of routes to the router table in the database.
     *
     * Available options:
     * - provider: The route grouping that is being dumped. All existing
     *   routes with this provider will be deleted on dump.
     * - base_class: The base class name.
     *
     * @param array $options
     *   An array of options.
     *
     * @throws \Exception
     *   Thrown if the table could not be created or the database connection
     *   failed.
     */
    public function dump(array $options = []) {
        // Convert all of the routes into database records.
        // Accumulate the menu masks on top of any we found before.
        $masks = array_flip($this->state
            ->get('routing.menu_masks.' . $this->tableName, []));
        // Delete any old records first, then insert the new ones. That avoids
        // stale data. The transaction makes it atomic to avoid unstable router
        // states due to random failures.
        try {
            $transaction = $this->connection
                ->startTransaction();
            // We don't use truncate, because it is not guaranteed to be transaction
            // safe.
            try {
                $this->connection
                    ->delete($this->tableName)
                    ->execute();
            } catch (\Exception $e) {
                if (!$this->ensureTableExists()) {
                    throw $e;
                }
            }
            // Split the routes into chunks to avoid big INSERT queries.
            $route_chunks = array_chunk($this->routes
                ->all(), 50, TRUE);
            foreach ($route_chunks as $routes) {
                $insert = $this->connection
                    ->insert($this->tableName)
                    ->fields([
                    'name',
                    'fit',
                    'path',
                    'pattern_outline',
                    'number_parts',
                    'route',
                ]);
                $names = [];
                foreach ($routes as $name => $route) {
                    
                    /** @var \Symfony\Component\Routing\Route $route */
                    $route->setOption('compiler_class', RouteCompiler::class);
                    
                    /** @var \Drupal\Core\Routing\CompiledRoute $compiled */
                    $compiled = $route->compile();
                    // The fit value is a binary number which has 1 at every fixed path
                    // position and 0 where there is a wildcard. We keep track of all such
                    // patterns that exist so that we can minimize the number of path
                    // patterns we need to check in the RouteProvider.
                    $masks[$compiled->getFit()] = 1;
                    $names[] = $name;
                    $values = [
                        'name' => $name,
                        'fit' => $compiled->getFit(),
                        'path' => $route->getPath(),
                        'pattern_outline' => $compiled->getPatternOutline(),
                        'number_parts' => $compiled->getNumParts(),
                        'route' => serialize($route),
                    ];
                    $insert->values($values);
                }
                // Insert all new routes.
                $insert->execute();
            }
        } catch (\Exception $e) {
            if (isset($transaction)) {
                $transaction->rollBack();
            }
            watchdog_exception('Routing', $e);
            throw $e;
        }
        // Sort the masks so they are in order of descending fit.
        $masks = array_keys($masks);
        rsort($masks);
        $this->state
            ->set('routing.menu_masks.' . $this->tableName, $masks);
        $this->routes = NULL;
    }
    
    /**
     * Gets the routes to match.
     *
     * @return \Symfony\Component\Routing\RouteCollection
     *   A RouteCollection instance representing all routes currently in the
     *   dumper.
     */
    public function getRoutes() {
        return $this->routes;
    }
    
    /**
     * Checks if the tree table exists and create it if not.
     *
     * @return bool
     *   TRUE if the table was created, FALSE otherwise.
     */
    protected function ensureTableExists() {
        try {
            $this->connection
                ->schema()
                ->createTable($this->tableName, $this->schemaDefinition());
        } catch (DatabaseException $e) {
            // If another process has already created the config table, attempting to
            // recreate it will throw an exception. In this case just catch the
            // exception and do nothing.
        } catch (\Exception $e) {
            return FALSE;
        }
        return TRUE;
    }
    
    /**
     * Defines the schema for the router table.
     *
     * @return array
     *   The schema API definition for the SQL storage table.
     *
     * @internal
     */
    protected function schemaDefinition() {
        $schema = [
            'description' => 'Maps paths to various callbacks (access, page and title)',
            'fields' => [
                'name' => [
                    'description' => 'Primary Key: Machine name of this route',
                    'type' => 'varchar_ascii',
                    'length' => 255,
                    'not null' => TRUE,
                    'default' => '',
                ],
                'path' => [
                    'description' => 'The path for this URI',
                    'type' => 'varchar',
                    'length' => 255,
                    'not null' => TRUE,
                    'default' => '',
                ],
                'pattern_outline' => [
                    'description' => 'The pattern',
                    'type' => 'varchar',
                    'length' => 255,
                    'not null' => TRUE,
                    'default' => '',
                ],
                'fit' => [
                    'description' => 'A numeric representation of how specific the path is.',
                    'type' => 'int',
                    'not null' => TRUE,
                    'default' => 0,
                ],
                'route' => [
                    'description' => 'A serialized Route object',
                    'type' => 'blob',
                    'size' => 'big',
                ],
                'number_parts' => [
                    'description' => 'Number of parts in this router path.',
                    'type' => 'int',
                    'not null' => TRUE,
                    'default' => 0,
                    'size' => 'small',
                ],
            ],
            'indexes' => [
                'pattern_outline_parts' => [
                    'pattern_outline',
                    'number_parts',
                ],
            ],
            'primary key' => [
                'name',
            ],
        ];
        return $schema;
    }

}