| 1 |
<?php |
| 2 |
/** |
| 3 |
* Table-name parsing and metadata probes for database error handling. |
| 4 |
*/ |
| 5 |
|
| 6 |
if (!defined('ABSPATH')) { |
| 7 |
exit; |
| 8 |
} |
| 9 |
|
| 10 |
// allow-no-test-found: covered through DatabaseErrorClassifier facade by tests/MissingTableErrorDoubleReportingTest.php and tests/DataAccessRetrySemanticsTest.php |
| 11 |
class ABJ_404_Solution_DatabaseErrorTableInspector { |
| 12 |
|
| 13 |
/** @var ABJ_404_Solution_Logging */ |
| 14 |
private $logger; |
| 15 |
|
| 16 |
/** @var (callable(string): bool)|null */ |
| 17 |
private $confirmedTableAbsenceProbe; |
| 18 |
|
| 19 |
/** |
| 20 |
* @param ABJ_404_Solution_Logging $logger |
| 21 |
* @param (callable(string): bool)|null $confirmedTableAbsenceProbe |
| 22 |
* Returns true only when the database positively confirms absence. |
| 23 |
*/ |
| 24 |
public function __construct($logger, $confirmedTableAbsenceProbe = null) { |
| 25 |
$this->logger = $logger; |
| 26 |
$this->confirmedTableAbsenceProbe = is_callable($confirmedTableAbsenceProbe) |
| 27 |
? $confirmedTableAbsenceProbe : null; |
| 28 |
} |
| 29 |
|
| 30 |
/** |
| 31 |
* Extract a table name from a MySQL "table is full" error message. |
| 32 |
* |
| 33 |
* @param string $errorText |
| 34 |
* @return string|null |
| 35 |
*/ |
| 36 |
public function extractTableNameFromFullError(string $errorText): ?string { |
| 37 |
if (preg_match("/table '([^']+)' is full/i", $errorText, $m)) { |
| 38 |
return $m[1]; |
| 39 |
} |
| 40 |
return null; |
| 41 |
} |
| 42 |
|
| 43 |
/** |
| 44 |
* Extract the table name from a MySQL "doesn't exist" error message. |
| 45 |
* |
| 46 |
* @param string $errorText |
| 47 |
* @return string |
| 48 |
*/ |
| 49 |
public function extractMissingTableNameFromError(string $errorText): string { |
| 50 |
if ($errorText === '') { |
| 51 |
return ''; |
| 52 |
} |
| 53 |
if (!preg_match("/Table '([^']+)' doesn't exist/i", $errorText, $matches)) { |
| 54 |
return ''; |
| 55 |
} |
| 56 |
$fullName = $matches[1]; |
| 57 |
$dotPos = strrpos($fullName, '.'); |
| 58 |
return $dotPos !== false ? substr($fullName, $dotPos + 1) : $fullName; |
| 59 |
} |
| 60 |
|
| 61 |
/** |
| 62 |
* Whether WordPress recognizes the missing table and the database also |
| 63 |
* positively confirms that WordPress's authoritative name is absent. |
| 64 |
* |
| 65 |
* A failed query against a generated prefix remains a plugin ERROR when |
| 66 |
* WordPress's own table exists: that means our name resolution drifted. |
| 67 |
* An inconclusive SHOW TABLES probe also remains an ERROR because failure |
| 68 |
* to prove presence is not evidence of absence. |
| 69 |
* |
| 70 |
* @param string $errorText |
| 71 |
* @return bool |
| 72 |
*/ |
| 73 |
public function isConfirmedMissingWordPressTableError(string $errorText): bool { |
| 74 |
if ($this->confirmedTableAbsenceProbe === null) { |
| 75 |
return false; |
| 76 |
} |
| 77 |
|
| 78 |
$missingTable = $this->extractMissingTableNameFromError($errorText); |
| 79 |
if ($missingTable === '') { |
| 80 |
return false; |
| 81 |
} |
| 82 |
|
| 83 |
global $wpdb; |
| 84 |
if (!isset($wpdb) || !is_object($wpdb)) { |
| 85 |
return false; |
| 86 |
} |
| 87 |
|
| 88 |
$tableSuffixes = isset($wpdb->tables) && is_array($wpdb->tables) |
| 89 |
? $wpdb->tables : array(); |
| 90 |
$tableSuffixes[] = 'users'; |
| 91 |
$prefix = isset($wpdb->prefix) && is_scalar($wpdb->prefix) |
| 92 |
? (string)$wpdb->prefix : ''; |
| 93 |
|
| 94 |
foreach (array_unique($tableSuffixes, SORT_REGULAR) as $tableSuffix) { |
| 95 |
if (!is_scalar($tableSuffix) || (string)$tableSuffix === '') { |
| 96 |
continue; |
| 97 |
} |
| 98 |
$property = (string)$tableSuffix; |
| 99 |
if (!isset($wpdb->{$property}) || !is_scalar($wpdb->{$property})) { |
| 100 |
continue; |
| 101 |
} |
| 102 |
$wordpressTable = (string)$wpdb->{$property}; |
| 103 |
if ($wordpressTable === '') { |
| 104 |
continue; |
| 105 |
} |
| 106 |
$generatedTable = $prefix . $property; |
| 107 |
if ($missingTable !== $generatedTable && $missingTable !== $wordpressTable) { |
| 108 |
continue; |
| 109 |
} |
| 110 |
return (bool)call_user_func($this->confirmedTableAbsenceProbe, $wordpressTable); |
| 111 |
} |
| 112 |
|
| 113 |
return false; |
| 114 |
} |
| 115 |
|
| 116 |
/** |
| 117 |
* Check if a given table uses the InnoDB storage engine. |
| 118 |
* |
| 119 |
* @param string $tableName |
| 120 |
* @return bool |
| 121 |
*/ |
| 122 |
public function isInnoDBTable(string $tableName): bool { |
| 123 |
global $wpdb; |
| 124 |
/** @var wpdb $wpdb */ |
| 125 |
if (!is_object($wpdb) || !method_exists($wpdb, 'get_var') || !method_exists($wpdb, 'prepare')) { |
| 126 |
return false; |
| 127 |
} |
| 128 |
if (defined('DB_NAME')) { |
| 129 |
$dbName = (string)DB_NAME; |
| 130 |
} else { |
| 131 |
static $warnedNoDbName = false; |
| 132 |
if (!$warnedNoDbName) { |
| 133 |
$warnedNoDbName = true; |
| 134 |
$this->logger->warn(__METHOD__ . ': DB_NAME undefined; using empty schema in InnoDB probe'); |
| 135 |
} |
| 136 |
$dbName = ''; |
| 137 |
} |
| 138 |
// DAO-bypass-approved: read-only information_schema engine probe for classifying table-full DB errors. |
| 139 |
$engine = $wpdb->get_var( |
| 140 |
// DAO-bypass-approved: prepare call for read-only information_schema engine probe placeholders. |
| 141 |
$wpdb->prepare( |
| 142 |
"SELECT ENGINE FROM information_schema.TABLES WHERE TABLE_SCHEMA = %s AND TABLE_NAME = %s", |
| 143 |
$dbName, |
| 144 |
$tableName |
| 145 |
) |
| 146 |
); |
| 147 |
return is_string($engine) && strtolower($engine) === 'innodb'; |
| 148 |
} |
| 149 |
} |
| 150 |
|
