summaryrefslogtreecommitdiffstats
path: root/core/modules/dblog/src/Tests/DbLogTest.php
blob: 7db1b1630fd5b7f15a7cd14ad38f96c7a81e743d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
<?php

/**
 * @file
 * Contains \Drupal\dblog\Tests\DbLogTest.
 */

namespace Drupal\dblog\Tests;

use Drupal\Component\Utility\Unicode;
use Drupal\Component\Utility\Xss;
use Drupal\Core\Logger\RfcLogLevel;
use Drupal\Core\Url;
use Drupal\dblog\Controller\DbLogController;
use Drupal\simpletest\WebTestBase;

/**
 * Generate events and verify dblog entries; verify user access to log reports
 * based on permissions.
 *
 * @group dblog
 */
class DbLogTest extends WebTestBase {

  /**
   * Modules to enable.
   *
   * @var array
   */
  public static $modules = array('dblog', 'node', 'forum', 'help', 'block');

  /**
   * A user with some relevant administrative permissions.
   *
   * @var \Drupal\user\UserInterface
   */
  protected $adminUser;

  /**
   * A user without any permissions.
   *
   * @var \Drupal\user\UserInterface
   */
  protected $webUser;

  /**
   * {@inheritdoc}
   */
  protected function setUp() {
    parent::setUp();
    $this->drupalPlaceBlock('system_breadcrumb_block');

    // Create users with specific permissions.
    $this->adminUser = $this->drupalCreateUser(array('administer site configuration', 'access administration pages', 'access site reports', 'administer users'));
    $this->webUser = $this->drupalCreateUser(array());
  }

  /**
   * Tests Database Logging module functionality through interfaces.
   *
   * First logs in users, then creates database log events, and finally tests
   * Database Logging module functionality through both the admin and user
   * interfaces.
   */
  function testDbLog() {
    // Login the admin user.
    $this->drupalLogin($this->adminUser);

    $row_limit = 100;
    $this->verifyRowLimit($row_limit);
    $this->verifyCron($row_limit);
    $this->verifyEvents();
    $this->verifyReports();
    $this->verifyBreadcrumbs();
    $this->verifyLinkEscaping();
    // Verify the overview table sorting.
    $orders = array('Date', 'Type', 'User');
    $sorts = array('asc', 'desc');
    foreach ($orders as $order) {
      foreach ($sorts as $sort) {
        $this->verifySort($sort, $order);
      }
    }

    // Login the regular user.
    $this->drupalLogin($this->webUser);
    $this->verifyReports(403);
  }

  /**
   * Verifies setting of the database log row limit.
   *
   * @param int $row_limit
   *   The row limit.
   */
  private function verifyRowLimit($row_limit) {
    // Change the database log row limit.
    $edit = array();
    $edit['dblog_row_limit'] = $row_limit;
    $this->drupalPostForm('admin/config/development/logging', $edit, t('Save configuration'));
    $this->assertResponse(200);

    // Check row limit variable.
    $current_limit = $this->config('dblog.settings')->get('row_limit');
    $this->assertTrue($current_limit == $row_limit, format_string('[Cache] Row limit variable of @count equals row limit of @limit', array('@count' => $current_limit, '@limit' => $row_limit)));
  }

  /**
   * Verifies that cron correctly applies the database log row limit.
   *
   * @param int $row_limit
   *   The row limit.
   */
  private function verifyCron($row_limit) {
    // Generate additional log entries.
    $this->generateLogEntries($row_limit + 10);
    // Verify that the database log row count exceeds the row limit.
    $count = db_query('SELECT COUNT(wid) FROM {watchdog}')->fetchField();
    $this->assertTrue($count > $row_limit, format_string('Dblog row count of @count exceeds row limit of @limit', array('@count' => $count, '@limit' => $row_limit)));

    // Run a cron job.
    $this->cronRun();
    // Verify that the database log row count equals the row limit plus one
    // because cron adds a record after it runs.
    $count = db_query('SELECT COUNT(wid) FROM {watchdog}')->fetchField();
    $this->assertTrue($count == $row_limit + 1, format_string('Dblog row count of @count equals row limit of @limit plus one', array('@count' => $count, '@limit' => $row_limit)));
  }

  /**
   * Generates a number of random database log events.
   *
   * @param int $count
   *   Number of watchdog entries to generate.
   * @param array $options
   *   These options are used to override the defaults for the test.
   *   An associative array containing any of the following keys:
   *   - 'channel': String identifying the log channel to be output to.
   *     If the channel is not set, the default of 'custom' will be used.
   *   - 'message': String containing a message to be output to the log.
   *     A simple default message is used if not provided.
   *   - 'variables': Array of variables that match the message string.
   *   - 'severity': Log severity level as defined in logging_severity_levels.
   *   - 'link': String linking to view the result of the event.
   *   - 'user': String identifying the username.
   *   - 'uid': Int identifying the user id for the user.
   *   - 'request_uri': String identifying the location of the request.
   *   - 'referer': String identifying the referring url.
   *   - 'ip': String The ip address of the client machine triggering the log
   *     entry.
   *   - 'timestamp': Int unix timestamp.
   */
  private function generateLogEntries($count, $options = array()) {
    global $base_root;

    // Prepare the fields to be logged
    $log = $options + array(
      'channel'     => 'custom',
      'message'     => 'Dblog test log message',
      'variables'   => array(),
      'severity'    => RfcLogLevel::NOTICE,
      'link'        => NULL,
      'user'        => $this->adminUser,
      'uid'         => $this->adminUser->id(),
      'request_uri' => $base_root . \Drupal::request()->getRequestUri(),
      'referer'     => \Drupal::request()->server->get('HTTP_REFERER'),
      'ip'          => '127.0.0.1',
      'timestamp'   => REQUEST_TIME,
    );

    $logger = $this->container->get('logger.dblog');
    $message = $log['message'] . ' Entry #';
    for ($i = 0; $i < $count; $i++) {
      $log['message'] = $message . $i;
      $logger->log($log['severity'], $log['message'], $log);
    }
  }

  /**
   * Confirms that database log reports are displayed at the correct paths.
   *
   * @param int $response
   *   (optional) HTTP response code. Defaults to 200.
   */
  private function verifyReports($response = 200) {
    // View the database log help page.
    $this->drupalGet('admin/help/dblog');
    $this->assertResponse($response);
    if ($response == 200) {
      $this->assertText(t('Database Logging'), 'DBLog help was displayed');
    }

    // View the database log report page.
    $this->drupalGet('admin/reports/dblog');
    $this->assertResponse($response);
    if ($response == 200) {
      $this->assertText(t('Recent log messages'), 'DBLog report was displayed');
    }

    // View the database log page-not-found report page.
    $this->drupalGet('admin/reports/page-not-found');
    $this->assertResponse($response);
    if ($response == 200) {
      $this->assertText("Top 'page not found' errors", 'DBLog page-not-found report was displayed');
    }

    // View the database log access-denied report page.
    $this->drupalGet('admin/reports/access-denied');
    $this->assertResponse($response);
    if ($response == 200) {
      $this->assertText("Top 'access denied' errors", 'DBLog access-denied report was displayed');
    }

    // View the database log event page.
    $wid = db_query('SELECT MIN(wid) FROM {watchdog}')->fetchField();
    $this->drupalGet('admin/reports/dblog/event/' . $wid);
    $this->assertResponse($response);
    if ($response == 200) {
      $this->assertText(t('Details'), 'DBLog event node was displayed');
    }

  }

  /**
   * Generates and then verifies breadcrumbs.
   */
  private function verifyBreadcrumbs() {
    // View the database log event page.
    $wid = db_query('SELECT MIN(wid) FROM {watchdog}')->fetchField();
    $this->drupalGet('admin/reports/dblog/event/' . $wid);
    $xpath = '//nav[@class="breadcrumb"]/ol/li[last()]/a';
    $this->assertEqual(current($this->xpath($xpath)), 'Recent log messages', 'DBLogs link displayed at breadcrumb in event page.');
  }

  /**
   * Generates and then verifies various types of events.
   */
  private function verifyEvents() {
    // Invoke events.
    $this->doUser();
    $this->drupalCreateContentType(array('type' => 'article', 'name' => t('Article')));
    $this->drupalCreateContentType(array('type' => 'page', 'name' => t('Basic page')));
    $this->doNode('article');
    $this->doNode('page');
    $this->doNode('forum');

    // When a user account is canceled, any content they created remains but the
    // uid = 0. Records in the watchdog table related to that user have the uid
    // set to zero.
  }

  /**
   * Verifies the sorting functionality of the database logging reports table.
   *
   * @param string $sort
   *   The sort direction.
   * @param string $order
   *   The order by which the table should be sorted.
   */
  public function verifySort($sort = 'asc', $order = 'Date') {
    $this->drupalGet('admin/reports/dblog', array('query' => array('sort' => $sort, 'order' => $order)));
    $this->assertResponse(200);
    $this->assertText(t('Recent log messages'), 'DBLog report was displayed correctly and sorting went fine.');
  }

  /**
   * Tests the escaping of links in the operation row of a database log detail
   * page.
   */
  private function verifyLinkEscaping() {
    $link = \Drupal::l('View', Url::fromRoute('entity.node.canonical', array('node' => 1)));
    $message = 'Log entry added to do the verifyLinkEscaping test.';
    $this->generateLogEntries(1, array(
      'message' => $message,
      'link' => $link,
    ));

    $result = db_query_range('SELECT wid FROM {watchdog} ORDER BY wid DESC', 0, 1);
    $this->drupalGet('admin/reports/dblog/event/' . $result->fetchField());

    // Check if the link exists (unescaped).
    $this->assertRaw($link);
  }

  /**
   * Generates and then verifies some user events.
   */
  private function doUser() {
    // Set user variables.
    $name = $this->randomMachineName();
    $pass = user_password();
    // Add a user using the form to generate an add user event (which is not
    // triggered by drupalCreateUser).
    $edit = array();
    $edit['name'] = $name;
    $edit['mail'] = $name . '@example.com';
    $edit['pass[pass1]'] = $pass;
    $edit['pass[pass2]'] = $pass;
    $edit['status'] = 1;
    $this->drupalPostForm('admin/people/create', $edit, t('Create new account'));
    $this->assertResponse(200);
    // Retrieve the user object.
    $user = user_load_by_name($name);
    $this->assertTrue($user != NULL, format_string('User @name was loaded', array('@name' => $name)));
    // pass_raw property is needed by drupalLogin.
    $user->pass_raw = $pass;
    // Login user.
    $this->drupalLogin($user);
    // Logout user.
    $this->drupalLogout();
    // Fetch the row IDs in watchdog that relate to the user.
    $result = db_query('SELECT wid FROM {watchdog} WHERE uid = :uid', array(':uid' => $user->id()));
    foreach ($result as $row) {
      $ids[] = $row->wid;
    }
    $count_before = (isset($ids)) ? count($ids) : 0;
    $this->assertTrue($count_before > 0, format_string('DBLog contains @count records for @name', array('@count' => $count_before, '@name' => $user->getUsername())));

    // Login the admin user.
    $this->drupalLogin($this->adminUser);
    // Delete the user created at the start of this test.
    // We need to POST here to invoke batch_process() in the internal browser.
    $this->drupalPostForm('user/' . $user->id() . '/cancel', array('user_cancel_method' => 'user_cancel_reassign'), t('Cancel account'));

    // View the database log report.
    $this->drupalGet('admin/reports/dblog');
    $this->assertResponse(200);

    // Verify that the expected events were recorded.
    // Add user.
    // Default display includes name and email address; if too long, the email
    // address is replaced by three periods.
    $this->assertLogMessage(t('New user: %name %email.', array('%name' => $name, '%email' => '<' . $user->getEmail() . '>')), 'DBLog event was recorded: [add user]');
    // Login user.
    $this->assertLogMessage(t('Session opened for %name.', array('%name' => $name)), 'DBLog event was recorded: [login user]');
    // Logout user.
    $this->assertLogMessage(t('Session closed for %name.', array('%name' => $name)), 'DBLog event was recorded: [logout user]');
    // Delete user.
    $message = t('Deleted user: %name %email.', array('%name' => $name, '%email' => '<' . $user->getEmail() . '>'));
    $message_text = Unicode::truncate(Xss::filter($message, array()), 56, TRUE, TRUE);
    // Verify that the full message displays on the details page.
    $link = FALSE;
    if ($links = $this->xpath('//a[text()="' . html_entity_decode($message_text) . '"]')) {
      // Found link with the message text.
      $links = array_shift($links);
      foreach ($links->attributes() as $attr => $value) {
        if ($attr == 'href') {
          // Extract link to details page.
          $link = Unicode::substr($value, strpos($value, 'admin/reports/dblog/event/'));
          $this->drupalGet($link);
          // Check for full message text on the details page.
          $this->assertRaw($message, 'DBLog event details was found: [delete user]');
          break;
        }
      }
    }
    $this->assertTrue($link, 'DBLog event was recorded: [delete user]');
    // Visit random URL (to generate page not found event).
    $not_found_url = $this->randomMachineName(60);
    $this->drupalGet($not_found_url);
    $this->assertResponse(404);
    // View the database log page-not-found report page.
    $this->drupalGet('admin/reports/page-not-found');
    $this->assertResponse(200);
    // Check that full-length URL displayed.
    $this->assertText($not_found_url, 'DBLog event was recorded: [page not found]');
  }

  /**
   * Generates and then verifies some node events.
   *
   * @param string $type
   *   A node type (e.g., 'article', 'page' or 'forum').
   */
  private function doNode($type) {
    // Create user.
    $perm = array('create ' . $type . ' content', 'edit own ' . $type . ' content', 'delete own ' . $type . ' content');
    $user = $this->drupalCreateUser($perm);
    // Login user.
    $this->drupalLogin($user);

    // Create a node using the form in order to generate an add content event
    // (which is not triggered by drupalCreateNode).
    $edit = $this->getContent($type);
    $title = $edit['title[0][value]'];
    $this->drupalPostForm('node/add/' . $type, $edit, t('Save'));
    $this->assertResponse(200);
    // Retrieve the node object.
    $node = $this->drupalGetNodeByTitle($title);
    $this->assertTrue($node != NULL, format_string('Node @title was loaded', array('@title' => $title)));
    // Edit the node.
    $edit = $this->getContentUpdate($type);
    $this->drupalPostForm('node/' . $node->id() . '/edit', $edit, t('Save'));
    $this->assertResponse(200);
    // Delete the node.
    $this->drupalPostForm('node/' . $node->id() . '/delete', array(), t('Delete'));
    $this->assertResponse(200);
    // View the node (to generate page not found event).
    $this->drupalGet('node/' . $node->id());
    $this->assertResponse(404);
    // View the database log report (to generate access denied event).
    $this->drupalGet('admin/reports/dblog');
    $this->assertResponse(403);

    // Login the admin user.
    $this->drupalLogin($this->adminUser);
    // View the database log report.
    $this->drupalGet('admin/reports/dblog');
    $this->assertResponse(200);

    // Verify that node events were recorded.
    // Was node content added?
    $this->assertLogMessage(t('@type: added %title.', array('@type' => $type, '%title' => $title)), 'DBLog event was recorded: [content added]');
    // Was node content updated?
    $this->assertLogMessage(t('@type: updated %title.', array('@type' => $type, '%title' => $title)), 'DBLog event was recorded: [content updated]');
    // Was node content deleted?
    $this->assertLogMessage(t('@type: deleted %title.', array('@type' => $type, '%title' => $title)), 'DBLog event was recorded: [content deleted]');

    // View the database log access-denied report page.
    $this->drupalGet('admin/reports/access-denied');
    $this->assertResponse(200);
    // Verify that the 'access denied' event was recorded.
    $this->assertText('admin/reports/dblog', 'DBLog event was recorded: [access denied]');

    // View the database log page-not-found report page.
    $this->drupalGet('admin/reports/page-not-found');
    $this->assertResponse(200);
    // Verify that the 'page not found' event was recorded.
    $this->assertText('node/' . $node->id(), 'DBLog event was recorded: [page not found]');
  }

  /**
   * Creates random content based on node content type.
   *
   * @param string $type
   *   Node content type (e.g., 'article').
   *
   * @return array
   *   Random content needed by various node types.
   */
  private function getContent($type) {
    switch ($type) {
      case 'forum':
        $content = array(
          'title[0][value]' => $this->randomMachineName(8),
          'taxonomy_forums' => array(1),
          'body[0][value]' => $this->randomMachineName(32),
        );
        break;

      default:
        $content = array(
          'title[0][value]' => $this->randomMachineName(8),
          'body[0][value]' => $this->randomMachineName(32),
        );
        break;
    }
    return $content;
  }

  /**
   * Creates random content as an update based on node content type.
   *
   * @param string $type
   *   Node content type (e.g., 'article').
   *
   * @return array
   *   Random content needed by various node types.
   */
  private function getContentUpdate($type) {
    $content = array(
      'body[0][value]' => $this->randomMachineName(32),
    );
    return $content;
  }

  /**
   * Tests the addition and clearing of log events through the admin interface.
   *
   * Logs in the admin user, creates a database log event, and tests the
   * functionality of clearing the database log through the admin interface.
   */
  public function testDBLogAddAndClear() {
    global $base_root;
    // Get a count of how many watchdog entries already exist.
    $count = db_query('SELECT COUNT(*) FROM {watchdog}')->fetchField();
    $log = array(
      'channel'     => 'system',
      'message'     => 'Log entry added to test the doClearTest clear down.',
      'variables'   => array(),
      'severity'    => RfcLogLevel::NOTICE,
      'link'        => NULL,
      'user'        => $this->adminUser,
      'uid'         => $this->adminUser->id(),
      'request_uri' => $base_root . \Drupal::request()->getRequestUri(),
      'referer'     => \Drupal::request()->server->get('HTTP_REFERER'),
      'ip'          => '127.0.0.1',
      'timestamp'   => REQUEST_TIME,
    );
    // Add a watchdog entry.
    $this->container->get('logger.dblog')->log($log['severity'], $log['message'], $log);
    // Make sure the table count has actually been incremented.
    $this->assertEqual($count + 1, db_query('SELECT COUNT(*) FROM {watchdog}')->fetchField(), format_string('\Drupal\dblog\Logger\DbLog->log() added an entry to the dblog :count', array(':count' => $count)));
    // Login the admin user.
    $this->drupalLogin($this->adminUser);
    // Post in order to clear the database table.
    $this->drupalPostForm('admin/reports/dblog', array(), t('Clear log messages'));
    // Confirm that the logs should be cleared.
    $this->drupalPostForm(NULL, array(), 'Confirm');
    // Count the rows in watchdog that previously related to the deleted user.
    $count = db_query('SELECT COUNT(*) FROM {watchdog}')->fetchField();
    $this->assertEqual($count, 0, format_string('DBLog contains :count records after a clear.', array(':count' => $count)));
  }

  /**
   * Tests the database log filter functionality at admin/reports/dblog.
   */
  public function testFilter() {
    $this->drupalLogin($this->adminUser);

    // Clear the log to ensure that only generated entries will be found.
    db_delete('watchdog')->execute();

    // Generate 9 random watchdog entries.
    $type_names = array();
    $types = array();
    for ($i = 0; $i < 3; $i++) {
      $type_names[] = $type_name = $this->randomMachineName();
      $severity = RfcLogLevel::EMERGENCY;
      for ($j = 0; $j < 3; $j++) {
        $types[] = $type = array(
          'count' => $j + 1,
          'type' => $type_name,
          'severity' => $severity++,
        );
        $this->generateLogEntries($type['count'], array(
          'channel' => $type['type'],
          'severity' => $type['severity'],
        ));
      }
    }

    // View the database log page.
    $this->drupalGet('admin/reports/dblog');

    // Confirm that all the entries are displayed.
    $count = $this->getTypeCount($types);
    foreach ($types as $key => $type) {
      $this->assertEqual($count[$key], $type['count'], 'Count matched');
    }

    // Filter by each type and confirm that entries with various severities are
    // displayed.
    foreach ($type_names as $type_name) {
      $edit = array(
        'type[]' => array($type_name),
      );
      $this->drupalPostForm(NULL, $edit, t('Filter'));

      // Count the number of entries of this type.
      $type_count = 0;
      foreach ($types as $type) {
        if ($type['type'] == $type_name) {
          $type_count += $type['count'];
        }
      }

      $count = $this->getTypeCount($types);
      $this->assertEqual(array_sum($count), $type_count, 'Count matched');
    }

    // Set the filter to match each of the two filter-type attributes and
    // confirm the correct number of entries are displayed.
    foreach ($types as $type) {
      $edit = array(
        'type[]' => array($type['type']),
        'severity[]' => array($type['severity']),
      );
      $this->drupalPostForm(NULL, $edit, t('Filter'));

      $count = $this->getTypeCount($types);
      $this->assertEqual(array_sum($count), $type['count'], 'Count matched');
    }

    $this->drupalGet('admin/reports/dblog', array('query' => array('order' => 'Type')));
    $this->assertResponse(200);
    $this->assertText(t('Operations'), 'Operations text found');

    // Clear all logs and make sure the confirmation message is found.
    $this->drupalPostForm('admin/reports/dblog', array(), t('Clear log messages'));
    // Confirm that the logs should be cleared.
    $this->drupalPostForm(NULL, array(), 'Confirm');
    $this->assertText(t('Database log cleared.'), 'Confirmation message found');
  }

  /**
   * Gets the database log event information from the browser page.
   *
   * @return array
   *   List of log events where each event is an array with following keys:
   *   - severity: (int) A database log severity constant.
   *   - type: (string) The type of database log event.
   *   - message: (string) The message for this database log event.
   *   - user: (string) The user associated with this database log event.
   */
  protected function getLogEntries() {
    $entries = array();
    if ($table = $this->xpath('.//table[@id="admin-dblog"]')) {
      $table = array_shift($table);
      foreach ($table->tbody->tr as $row) {
        $entries[] = array(
          'severity' => $this->getSeverityConstant($row['class']),
          'type' => $this->asText($row->td[1]),
          'message' => $this->asText($row->td[3]),
          'user' => $this->asText($row->td[4]),
        );
      }
    }
    return $entries;
  }

  /**
   * Gets the count of database log entries by database log event type.
   *
   * @param array $types
   *   The type information to compare against.
   *
   * @return array
   *   The count of each type keyed by the key of the $types array.
   */
  protected function getTypeCount(array $types) {
    $entries = $this->getLogEntries();
    $count = array_fill(0, count($types), 0);
    foreach ($entries as $entry) {
      foreach ($types as $key => $type) {
        if ($entry['type'] == $type['type'] && $entry['severity'] == $type['severity']) {
          $count[$key]++;
          break;
        }
      }
    }
    return $count;
  }

  /**
   * Gets the watchdog severity constant corresponding to the CSS class.
   *
   * @param string $class
   *   CSS class attribute.
   *
   * @return int|null
   *   The watchdog severity constant or NULL if not found.
   */
  protected function getSeverityConstant($class) {
    $map = array_flip(DbLogController::getLogLevelClassMap());

    // Find the class that contains the severity.
    $classes = explode(' ', $class);
    foreach ($classes as $class) {
      if (isset($map[$class])) {
        return $map[$class];
      }
    }
    return NULL;
  }

  /**
   * Extracts the text contained by the XHTML element.
   *
   * @param \SimpleXMLElement $element
   *   Element to extract text from.
   *
   * @return string
   *   Extracted text.
   */
  protected function asText(\SimpleXMLElement $element) {
    if (!is_object($element)) {
      return $this->fail('The element is not an element.');
    }
    return trim(html_entity_decode(strip_tags($element->asXML())));
  }

  /**
   * Confirms that a log message appears on the database log overview screen.
   *
   * This function should only be used for the admin/reports/dblog page, because
   * it checks for the message link text truncated to 56 characters. Other log
   * pages have no detail links so they contain the full message text.
   *
   * @param string $log_message
   *   The database log message to check.
   * @param string $message
   *   The message to pass to simpletest.
   */
  protected function assertLogMessage($log_message, $message) {
    $message_text = Unicode::truncate(Xss::filter($log_message, array()), 56, TRUE, TRUE);
    // After \Drupal\Component\Utility\Xss::filter(), HTML entities should be
    // converted to their character equivalents because assertLink() uses this
    // string in xpath() to query the Document Object Model (DOM).
    $this->assertLink(html_entity_decode($message_text), 0, $message);
  }
}