+/******************************************************************************
+ * Error classes
+ *****************************************************************************/
+
+/**
+ * Database error base class
+ */
+class DBError extends MWException {
+ public $db;
+
+ /**
+ * Construct a database error
+ * @param Database $db The database object which threw the error
+ * @param string $error A simple error message to be used for debugging
+ */
+ function __construct( Database &$db, $error ) {
+ $this->db =& $db;
+ parent::__construct( $error );
+ }
+}
+
+class DBConnectionError extends DBError {
+ public $error;
+
+ function __construct( Database &$db, $error = 'unknown error' ) {
+ $msg = 'DB connection error';
+ if ( trim( $error ) != '' ) {
+ $msg .= ": $error";
+ }
+ $this->error = $error;
+ parent::__construct( $db, $msg );
+ }
+
+ function useOutputPage() {
+ // Not likely to work
+ return false;
+ }
+
+ function useMessageCache() {
+ // Not likely to work
+ return false;
+ }
+
+ function getText() {
+ return $this->getMessage() . "\n";
+ }
+
+ function getLogMessage() {
+ # Don't send to the exception log
+ return false;
+ }
+
+ function getPageTitle() {
+ global $wgSitename;
+ return "$wgSitename has a problem";
+ }
+
+ function getHTML() {
+ global $wgTitle, $wgUseFileCache, $title, $wgInputEncoding;
+ global $wgSitename, $wgServer, $wgMessageCache;
+
+ # I give up, Brion is right. Getting the message cache to work when there is no DB is tricky.
+ # Hard coding strings instead.
+
+ $noconnect = "<p><strong>Sorry! This site is experiencing technical difficulties.</strong></p><p>Try waiting a few minutes and reloading.</p><p><small>(Can't contact the database server: $1)</small></p>";
+ $mainpage = 'Main Page';
+ $searchdisabled = <<<EOT
+<p style="margin: 1.5em 2em 1em">$wgSitename search is disabled for performance reasons. You can search via Google in the meantime.
+<span style="font-size: 89%; display: block; margin-left: .2em">Note that their indexes of $wgSitename content may be out of date.</span></p>',
+EOT;
+
+ $googlesearch = "
+<!-- SiteSearch Google -->
+<FORM method=GET action=\"http://www.google.com/search\">
+<TABLE bgcolor=\"#FFFFFF\"><tr><td>
+<A HREF=\"http://www.google.com/\">
+<IMG SRC=\"http://www.google.com/logos/Logo_40wht.gif\"
+border=\"0\" ALT=\"Google\"></A>
+</td>
+<td>
+<INPUT TYPE=text name=q size=31 maxlength=255 value=\"$1\">
+<INPUT type=submit name=btnG VALUE=\"Google Search\">
+<font size=-1>
+<input type=hidden name=domains value=\"$wgServer\"><br /><input type=radio name=sitesearch value=\"\"> WWW <input type=radio name=sitesearch value=\"$wgServer\" checked> $wgServer <br />
+<input type='hidden' name='ie' value='$2'>
+<input type='hidden' name='oe' value='$2'>
+</font>
+</td></tr></TABLE>
+</FORM>
+<!-- SiteSearch Google -->";
+ $cachederror = "The following is a cached copy of the requested page, and may not be up to date. ";
+
+ # No database access
+ if ( is_object( $wgMessageCache ) ) {
+ $wgMessageCache->disable();
+ }
+
+ if ( trim( $this->error ) == '' ) {
+ $this->error = $this->db->getProperty('mServer');
+ }
+
+ $text = str_replace( '$1', $this->error, $noconnect );
+ $text .= wfGetSiteNotice();
+
+ if($wgUseFileCache) {
+ if($wgTitle) {
+ $t =& $wgTitle;
+ } else {
+ if($title) {
+ $t = Title::newFromURL( $title );
+ } elseif (@/**/$_REQUEST['search']) {
+ $search = $_REQUEST['search'];
+ return $searchdisabled .
+ str_replace( array( '$1', '$2' ), array( htmlspecialchars( $search ),
+ $wgInputEncoding ), $googlesearch );
+ } else {
+ $t = Title::newFromText( $mainpage );
+ }
+ }
+
+ $cache = new HTMLFileCache( $t );
+ if( $cache->isFileCached() ) {
+ $msg = '<p style="color: red"><b>'.$msg."<br />\n" .
+ $cachederror . "</b></p>\n";
+
+ $tag = '<div id="article">';
+ $text = str_replace(
+ $tag,
+ $tag . $msg,
+ $cache->fetchPageText() );
+ }
+ }
+
+ return $text;
+ }
+}
+
+class DBQueryError extends DBError {
+ public $error, $errno, $sql, $fname;
+
+ function __construct( Database &$db, $error, $errno, $sql, $fname ) {
+ $message = "A database error has occurred\n" .
+ "Query: $sql\n" .
+ "Function: $fname\n" .
+ "Error: $errno $error\n";
+
+ parent::__construct( $db, $message );
+ $this->error = $error;
+ $this->errno = $errno;
+ $this->sql = $sql;
+ $this->fname = $fname;
+ }
+
+ function getText() {
+ if ( $this->useMessageCache() ) {
+ return wfMsg( 'dberrortextcl', htmlspecialchars( $this->getSQL() ),
+ htmlspecialchars( $this->fname ), $this->errno, htmlspecialchars( $this->error ) ) . "\n";
+ } else {
+ return $this->getMessage();
+ }
+ }
+
+ function getSQL() {
+ global $wgShowSQLErrors;
+ if( !$wgShowSQLErrors ) {
+ return $this->msg( 'sqlhidden', 'SQL hidden' );
+ } else {
+ return $this->sql;
+ }
+ }
+
+ function getLogMessage() {
+ # Don't send to the exception log
+ return false;
+ }
+
+ function getPageTitle() {
+ return $this->msg( 'databaseerror', 'Database error' );
+ }
+
+ function getHTML() {
+ if ( $this->useMessageCache() ) {
+ return wfMsgNoDB( 'dberrortext', htmlspecialchars( $this->getSQL() ),
+ htmlspecialchars( $this->fname ), $this->errno, htmlspecialchars( $this->error ) );
+ } else {
+ return nl2br( htmlspecialchars( $this->getMessage() ) );
+ }
+ }
+}
+
+class DBUnexpectedError extends DBError {}
+
+/******************************************************************************/
+