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AphrontMySQLDatabaseConnectionBase.php
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Sun, Jul 27, 19:03

AphrontMySQLDatabaseConnectionBase.php
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<?php
abstract class AphrontMySQLDatabaseConnectionBase
extends AphrontDatabaseConnection {
private $configuration;
private $connection;
private $connectionPool = array();
private $lastResult;
private $nextError;
abstract protected function connect();
abstract protected function rawQuery($raw_query);
abstract protected function rawQueries(array $raw_queries);
abstract protected function fetchAssoc($result);
abstract protected function getErrorCode($connection);
abstract protected function getErrorDescription($connection);
abstract protected function closeConnection();
abstract protected function freeResult($result);
public function __construct(array $configuration) {
$this->configuration = $configuration;
}
public function __clone() {
$this->establishConnection();
}
public function close() {
if ($this->lastResult) {
$this->lastResult = null;
}
if ($this->connection) {
$this->closeConnection();
$this->connection = null;
}
}
public function escapeColumnName($name) {
return '`'.str_replace('`', '``', $name).'`';
}
public function escapeMultilineComment($comment) {
// These can either terminate a comment, confuse the hell out of the parser,
// make MySQL execute the comment as a query, or, in the case of semicolon,
// are quasi-dangerous because the semicolon could turn a broken query into
// a working query plus an ignored query.
static $map = array(
'--' => '(DOUBLEDASH)',
'*/' => '(STARSLASH)',
'//' => '(SLASHSLASH)',
'#' => '(HASH)',
'!' => '(BANG)',
';' => '(SEMICOLON)',
);
$comment = str_replace(
array_keys($map),
array_values($map),
$comment);
// For good measure, kill anything else that isn't a nice printable
// character.
$comment = preg_replace('/[^\x20-\x7F]+/', ' ', $comment);
return '/* '.$comment.' */';
}
public function escapeStringForLikeClause($value) {
$value = addcslashes($value, '\%_');
$value = $this->escapeUTF8String($value);
return $value;
}
protected function getConfiguration($key, $default = null) {
return idx($this->configuration, $key, $default);
}
private function establishConnection() {
$host = $this->getConfiguration('host');
$database = $this->getConfiguration('database');
$profiler = PhutilServiceProfiler::getInstance();
$call_id = $profiler->beginServiceCall(
array(
'type' => 'connect',
'host' => $host,
'database' => $database,
));
$retries = max(1, $this->getConfiguration('retries', 3));
while ($retries--) {
try {
$conn = $this->connect();
$profiler->endServiceCall($call_id, array());
break;
} catch (AphrontQueryException $ex) {
if ($retries && $ex->getCode() == 2003) {
$class = get_class($ex);
$message = $ex->getMessage();
phlog("Retrying ({$retries}) after {$class}: {$message}");
} else {
$profiler->endServiceCall($call_id, array());
throw $ex;
}
}
}
$this->connection = $conn;
}
protected function requireConnection() {
if (!$this->connection) {
if ($this->connectionPool) {
$this->connection = array_pop($this->connectionPool);
} else {
$this->establishConnection();
}
}
return $this->connection;
}
protected function beginAsyncConnection() {
$connection = $this->requireConnection();
$this->connection = null;
return $connection;
}
protected function endAsyncConnection($connection) {
if ($this->connection) {
$this->connectionPool[] = $this->connection;
}
$this->connection = $connection;
}
public function selectAllResults() {
$result = array();
$res = $this->lastResult;
if ($res == null) {
throw new Exception('No query result to fetch from!');
}
while (($row = $this->fetchAssoc($res))) {
$result[] = $row;
}
return $result;
}
public function executeRawQuery($raw_query) {
$this->lastResult = null;
$retries = max(1, $this->getConfiguration('retries', 3));
while ($retries--) {
try {
$this->requireConnection();
$is_write = $this->checkWrite($raw_query);
$profiler = PhutilServiceProfiler::getInstance();
$call_id = $profiler->beginServiceCall(
array(
'type' => 'query',
'config' => $this->configuration,
'query' => $raw_query,
'write' => $is_write,
));
$result = $this->rawQuery($raw_query);
$profiler->endServiceCall($call_id, array());
if ($this->nextError) {
$result = null;
}
if ($result) {
$this->lastResult = $result;
break;
}
$this->throwQueryException($this->connection);
} catch (AphrontQueryConnectionLostException $ex) {
if ($this->isInsideTransaction()) {
// Zero out the transaction state to prevent a second exception
// ("program exited with open transaction") from being thrown, since
// we're about to throw a more relevant/useful one instead.
$state = $this->getTransactionState();
while ($state->getDepth()) {
$state->decreaseDepth();
}
// We can't close the connection before this because
// isInsideTransaction() and getTransactionState() depend on the
// connection.
$this->close();
throw $ex;
}
$this->close();
if (!$retries) {
throw $ex;
}
}
}
}
public function executeRawQueries(array $raw_queries) {
if (!$raw_queries) {
return array();
}
$is_write = false;
foreach ($raw_queries as $key => $raw_query) {
$is_write = $is_write || $this->checkWrite($raw_query);
$raw_queries[$key] = rtrim($raw_query, "\r\n\t ;");
}
$profiler = PhutilServiceProfiler::getInstance();
$call_id = $profiler->beginServiceCall(
array(
'type' => 'multi-query',
'config' => $this->configuration,
'queries' => $raw_queries,
'write' => $is_write,
));
$results = $this->rawQueries($raw_queries);
$profiler->endServiceCall($call_id, array());
return $results;
}
protected function processResult($result) {
if (!$result) {
try {
$this->throwQueryException($this->requireConnection());
} catch (Exception $ex) {
return $ex;
}
} else if (is_bool($result)) {
return $this->getAffectedRows();
}
$rows = array();
while (($row = $this->fetchAssoc($result))) {
$rows[] = $row;
}
$this->freeResult($result);
return $rows;
}
protected function checkWrite($raw_query) {
// NOTE: The opening "(" allows queries in the form of:
//
// (SELECT ...) UNION (SELECT ...)
$is_write = !preg_match('/^[(]*(SELECT|SHOW|EXPLAIN)\s/', $raw_query);
if ($is_write) {
AphrontWriteGuard::willWrite();
return true;
}
return false;
}
protected function throwQueryException($connection) {
if ($this->nextError) {
$errno = $this->nextError;
$error = 'Simulated error.';
$this->nextError = null;
} else {
$errno = $this->getErrorCode($connection);
$error = $this->getErrorDescription($connection);
}
$this->throwQueryCodeException($errno, $error);
}
protected function throwQueryCodeException($errno, $error) {
$exmsg = "#{$errno}: {$error}";
switch ($errno) {
case 2013: // Connection Dropped
throw new AphrontQueryConnectionLostException($exmsg);
case 2006: // Gone Away
$more = "This error may occur if your MySQL 'wait_timeout' ".
"or 'max_allowed_packet' configuration values are set too low.";
throw new AphrontQueryConnectionLostException("{$exmsg}\n\n{$more}");
case 1213: // Deadlock
case 1205: // Lock wait timeout exceeded
throw new AphrontQueryDeadlockException($exmsg);
case 1062: // Duplicate Key
// NOTE: In some versions of MySQL we get a key name back here, but
// older versions just give us a key index ("key 2") so it's not
// portable to parse the key out of the error and attach it to the
// exception.
throw new AphrontQueryDuplicateKeyException($exmsg);
case 1044: // Access denied to database
case 1045: // Access denied (auth)
case 1142: // Access denied to table
case 1143: // Access denied to column
throw new AphrontQueryAccessDeniedException($exmsg);
case 1146: // No such table
case 1049: // No such database
case 1054: // Unknown column "..." in field list
throw new AphrontQuerySchemaException($exmsg);
default:
// TODO: 1064 is syntax error, and quite terrible in production.
throw new AphrontQueryException($exmsg);
}
}
/**
* Force the next query to fail with a simulated error. This should be used
* ONLY for unit tests.
*/
public function simulateErrorOnNextQuery($error) {
$this->nextError = $error;
return $this;
}
/**
* Check inserts for characters outside of the BMP. Even with the strictest
* settings, MySQL will silently truncate data when it encounters these, which
* can lead to data loss and security problems.
*/
protected function validateUTF8String($string) {
if (phutil_is_utf8_with_only_bmp_characters($string)) {
return;
}
throw new AphrontQueryCharacterSetException(
pht(
'Attempting to construct a query containing characters outside of '.
'the Unicode Basic Multilingual Plane. MySQL will silently truncate '.
'this data if it is inserted into a `utf8` column. Use the `%%B` '.
'conversion to escape binary strings data.'));
}
}

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