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<?php
declare(strict_types=1);
/**
* @copyright 2020 Christoph Wurst <christoph@winzerhof-wurst.at>
*
* @author 2020 Christoph Wurst <christoph@winzerhof-wurst.at>
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
namespace OC\Search;
use InvalidArgumentException;
use OC\AppFramework\Bootstrap\Coordinator;
use OCP\AppFramework\QueryException;
use OCP\ILogger;
use OCP\IServerContainer;
use OCP\IUser;
use OCP\Search\IProvider;
use OCP\Search\ISearchQuery;
use OCP\Search\SearchResult;
use function array_map;
/**
* Queries individual \OCP\Search\IProvider implementations and composes a
* unified search result for the user's search term
*
* The search process is generally split into two steps
*
* 1. Get a list of provider (`getProviders`)
* 2. Get search results of each provider (`search`)
*
* The reasoning behind this is that the runtime complexity of a combined search
* result would be O(n) and linearly grow with each provider added. This comes
* from the nature of php where we can't concurrently fetch the search results.
* So we offload the concurrency the client application (e.g. JavaScript in the
* browser) and let it first get the list of providers to then fetch all results
* concurrently. The client is free to decide whether all concurrent search
* results are awaited or shown as they come in.
*
* @see IProvider::search() for the arguments of the individual search requests
*/
class SearchComposer {
/** @var IProvider[] */
private $providers = [];
/** @var Coordinator */
private $bootstrapCoordinator;
/** @var IServerContainer */
private $container;
/** @var ILogger */
private $logger;
public function __construct(Coordinator $bootstrapCoordinator,
IServerContainer $container,
ILogger $logger) {
$this->container = $container;
$this->logger = $logger;
$this->bootstrapCoordinator = $bootstrapCoordinator;
}
/**
* Load all providers dynamically that were registered through `registerProvider`
*
* If a provider can't be loaded we log it but the operation continues nevertheless
*/
private function loadLazyProviders(): void {
$context = $this->bootstrapCoordinator->getRegistrationContext();
if ($context === null) {
// Too early, nothing registered yet
return;
}
$registrations = $context->getSearchProviders();
foreach ($registrations as $registration) {
try {
/** @var IProvider $provider */
$provider = $this->container->query($registration['class']);
$this->providers[$provider->getId()] = $provider;
} catch (QueryException $e) {
// Log an continue. We can be fault tolerant here.
$this->logger->logException($e, [
'message' => 'Could not load search provider dynamically: ' . $e->getMessage(),
'level' => ILogger::ERROR,
]);
}
}
}
/**
* Get a list of all provider IDs for the consecutive calls to `search`
*
* @return string[]
*/
public function getProviders(): array {
$this->loadLazyProviders();
/**
* Return an array with the IDs, but strip the associative keys
*/
return array_values(
array_map(function (IProvider $provider) {
return $provider->getId();
}, $this->providers));
}
/**
* Query an individual search provider for results
*
* @param IUser $user
* @param string $providerId one of the IDs received by `getProviders`
* @param ISearchQuery $query
*
* @return SearchResult
* @throws InvalidArgumentException when the $providerId does not correspond to a registered provider
*/
public function search(IUser $user,
string $providerId,
ISearchQuery $query): SearchResult {
$this->loadLazyProviders();
$provider = $this->providers[$providerId] ?? null;
if ($provider === null) {
throw new InvalidArgumentException("Provider $providerId is unknown");
}
return $provider->search($user, $query);
}
}
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