<?php

namespace Drupal\Tests\system\Functional\Lock;

use Drupal\Tests\BrowserTestBase;

/**
 * Confirm locking works between two separate requests.
 *
 * @group Lock
 */
class LockFunctionalTest extends BrowserTestBase {

  /**
   * Modules to enable.
   *
   * @var array
   */
  public static $modules = ['system_test'];

  /**
   * Confirms that we can acquire and release locks in two parallel requests.
   */
  public function testLockAcquire() {
    $lock = $this->container->get('lock');
    $lock_acquired = 'TRUE: Lock successfully acquired in \Drupal\system_test\Controller\SystemTestController::lockAcquire()';
    $lock_not_acquired = 'FALSE: Lock not acquired in \Drupal\system_test\Controller\SystemTestController::lockAcquire()';
    $this->assertTrue($lock->acquire('system_test_lock_acquire'), 'Lock acquired by this request.', 'Lock');
    $this->assertTrue($lock->acquire('system_test_lock_acquire'), 'Lock extended by this request.', 'Lock');
    $lock->release('system_test_lock_acquire');

    // Cause another request to acquire the lock.
    $this->drupalGet('system-test/lock-acquire');
    $this->assertText($lock_acquired, 'Lock acquired by the other request.', 'Lock');
    // The other request has finished, thus it should have released its lock.
    $this->assertTrue($lock->acquire('system_test_lock_acquire'), 'Lock acquired by this request.', 'Lock');
    // This request holds the lock, so the other request cannot acquire it.
    $this->drupalGet('system-test/lock-acquire');
    $this->assertText($lock_not_acquired, 'Lock not acquired by the other request.', 'Lock');
    $lock->release('system_test_lock_acquire');

    // Try a very short timeout and lock breaking.
    $this->assertTrue($lock->acquire('system_test_lock_acquire', 0.5), 'Lock acquired by this request.', 'Lock');
    sleep(1);
    // The other request should break our lock.
    $this->drupalGet('system-test/lock-acquire');
    $this->assertText($lock_acquired, 'Lock acquired by the other request, breaking our lock.', 'Lock');
    // We cannot renew it, since the other thread took it.
    $this->assertFalse($lock->acquire('system_test_lock_acquire'), 'Lock cannot be extended by this request.', 'Lock');

    // Check the shut-down function.
    $lock_acquired_exit = 'TRUE: Lock successfully acquired in \Drupal\system_test\Controller\SystemTestController::lockExit()';
    $this->drupalGet('system-test/lock-exit');
    $this->assertText($lock_acquired_exit, 'Lock acquired by the other request before exit.', 'Lock');
    $this->assertTrue($lock->acquire('system_test_lock_exit'), 'Lock acquired by this request after the other request exits.', 'Lock');
  }

  /**
   * Tests that the persistent lock is persisted between requests.
   */
  public function testPersistentLock() {
    $persistent_lock = $this->container->get('lock.persistent');
    // Get a persistent lock.
    $this->drupalGet('system-test/lock-persist/lock1');
    $this->assertText('TRUE: Lock successfully acquired in SystemTestController::lockPersist()');
    // Ensure that a shutdown function has not released the lock.
    $this->assertFalse($persistent_lock->lockMayBeAvailable('lock1'));
    $this->drupalGet('system-test/lock-persist/lock1');
    $this->assertText('FALSE: Lock not acquired in SystemTestController::lockPersist()');

    // Get another persistent lock.
    $this->drupalGet('system-test/lock-persist/lock2');
    $this->assertText('TRUE: Lock successfully acquired in SystemTestController::lockPersist()');
    $this->assertFalse($persistent_lock->lockMayBeAvailable('lock2'));

    // Release the first lock and try getting it again.
    $persistent_lock->release('lock1');
    $this->drupalGet('system-test/lock-persist/lock1');
    $this->assertText('TRUE: Lock successfully acquired in SystemTestController::lockPersist()');
  }

}