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PhabricatorLiskDAO.php
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Mon, Apr 14, 18:17

PhabricatorLiskDAO.php
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<?php
/**
* @task config Configuring Storage
*/
abstract class PhabricatorLiskDAO extends LiskDAO {
private static $namespaceStack = array();
const ATTACHABLE = '<attachable>';
const CONFIG_APPLICATION_SERIALIZERS = 'phabricator/serializers';
/* -( Configuring Storage )------------------------------------------------ */
/**
* @task config
*/
public static function pushStorageNamespace($namespace) {
self::$namespaceStack[] = $namespace;
}
/**
* @task config
*/
public static function popStorageNamespace() {
array_pop(self::$namespaceStack);
}
/**
* @task config
*/
public static function getDefaultStorageNamespace() {
return PhabricatorEnv::getEnvConfig('storage.default-namespace');
}
/**
* @task config
*/
public static function getStorageNamespace() {
$namespace = end(self::$namespaceStack);
if (!strlen($namespace)) {
$namespace = self::getDefaultStorageNamespace();
}
if (!strlen($namespace)) {
throw new Exception(pht('No storage namespace configured!'));
}
return $namespace;
}
/**
* @task config
*/
protected function establishLiveConnection($mode) {
$namespace = self::getStorageNamespace();
$database = $namespace.'_'.$this->getApplicationName();
$is_readonly = PhabricatorEnv::isReadOnly();
if ($is_readonly && ($mode != 'r')) {
$this->raiseImproperWrite($database);
}
$is_cluster = (bool)PhabricatorEnv::getEnvConfig('cluster.databases');
if ($is_cluster) {
$connection = $this->newClusterConnection($database, $mode);
} else {
$connection = $this->newBasicConnection($database, $mode, $namespace);
}
// TODO: This should be testing if the mode is "r", but that would probably
// break a lot of things. Perform a more narrow test for readonly mode
// until we have greater certainty that this works correctly most of the
// time.
if ($is_readonly) {
$connection->setReadOnly(true);
}
// Unless this is a script running from the CLI, prevent any query from
// running for more than 30 seconds. See T10849 for discussion.
if (php_sapi_name() != 'cli') {
$connection->setQueryTimeout(30);
}
return $connection;
}
private function newBasicConnection($database, $mode, $namespace) {
$conf = PhabricatorEnv::newObjectFromConfig(
'mysql.configuration-provider',
array($this, $mode, $namespace));
return PhabricatorEnv::newObjectFromConfig(
'mysql.implementation',
array(
array(
'user' => $conf->getUser(),
'pass' => $conf->getPassword(),
'host' => $conf->getHost(),
'port' => $conf->getPort(),
'database' => $database,
'retries' => 3,
'timeout' => 10,
),
));
}
private function newClusterConnection($database, $mode) {
$master = PhabricatorDatabaseRef::getMasterDatabaseRef();
if ($master && !$master->isSevered()) {
$connection = $master->newApplicationConnection($database);
if ($master->isReachable($connection)) {
return $connection;
} else {
if ($mode == 'w') {
$this->raiseImpossibleWrite($database);
}
PhabricatorEnv::setReadOnly(
true,
PhabricatorEnv::READONLY_UNREACHABLE);
}
}
$replica = PhabricatorDatabaseRef::getReplicaDatabaseRef();
if ($replica) {
$connection = $replica->newApplicationConnection($database);
$connection->setReadOnly(true);
if ($replica->isReachable($connection)) {
return $connection;
}
}
if (!$master && !$replica) {
$this->raiseUnconfigured($database);
}
$this->raiseUnreachable($database);
}
private function raiseImproperWrite($database) {
throw new PhabricatorClusterImproperWriteException(
pht(
'Unable to establish a write-mode connection (to application '.
'database "%s") because Phabricator is in read-only mode. Whatever '.
'you are trying to do does not function correctly in read-only mode.',
$database));
}
private function raiseImpossibleWrite($database) {
throw new PhabricatorClusterImpossibleWriteException(
pht(
'Unable to connect to master database ("%s"). This is a severe '.
'failure; your request did not complete.',
$database));
}
private function raiseUnconfigured($database) {
throw new Exception(
pht(
'Unable to establish a connection to any database host '.
'(while trying "%s"). No masters or replicas are configured.',
$database));
}
private function raiseUnreachable($database) {
throw new PhabricatorClusterStrandedException(
pht(
'Unable to establish a connection to any database host '.
'(while trying "%s"). All masters and replicas are completely '.
'unreachable.',
$database));
}
/**
* @task config
*/
public function getTableName() {
$str = 'phabricator';
$len = strlen($str);
$class = strtolower(get_class($this));
if (!strncmp($class, $str, $len)) {
$class = substr($class, $len);
}
$app = $this->getApplicationName();
if (!strncmp($class, $app, strlen($app))) {
$class = substr($class, strlen($app));
}
if (strlen($class)) {
return $app.'_'.$class;
} else {
return $app;
}
}
/**
* @task config
*/
abstract public function getApplicationName();
protected function getConnectionNamespace() {
return self::getStorageNamespace().'_'.$this->getApplicationName();
}
/**
* Break a list of escaped SQL statement fragments (e.g., VALUES lists for
* INSERT, previously built with @{function:qsprintf}) into chunks which will
* fit under the MySQL 'max_allowed_packet' limit.
*
* Chunks are glued together with `$glue`, by default ", ".
*
* If a statement is too large to fit within the limit, it is broken into
* its own chunk (but might fail when the query executes).
*/
public static function chunkSQL(
array $fragments,
$glue = ', ',
$limit = null) {
if ($limit === null) {
// NOTE: Hard-code this at 1MB for now, minus a 10% safety buffer.
// Eventually we could query MySQL or let the user configure it.
$limit = (int)((1024 * 1024) * 0.90);
}
$result = array();
$chunk = array();
$len = 0;
$glue_len = strlen($glue);
foreach ($fragments as $fragment) {
$this_len = strlen($fragment);
if ($chunk) {
// Chunks after the first also imply glue.
$this_len += $glue_len;
}
if ($len + $this_len <= $limit) {
$len += $this_len;
$chunk[] = $fragment;
} else {
if ($chunk) {
$result[] = $chunk;
}
$len = strlen($fragment);
$chunk = array($fragment);
}
}
if ($chunk) {
$result[] = $chunk;
}
foreach ($result as $key => $fragment_list) {
$result[$key] = implode($glue, $fragment_list);
}
return $result;
}
protected function assertAttached($property) {
if ($property === self::ATTACHABLE) {
throw new PhabricatorDataNotAttachedException($this);
}
return $property;
}
protected function assertAttachedKey($value, $key) {
$this->assertAttached($value);
if (!array_key_exists($key, $value)) {
throw new PhabricatorDataNotAttachedException($this);
}
return $value[$key];
}
protected function detectEncodingForStorage($string) {
return phutil_is_utf8($string) ? 'utf8' : null;
}
protected function getUTF8StringFromStorage($string, $encoding) {
if ($encoding == 'utf8') {
return $string;
}
if (function_exists('mb_detect_encoding')) {
if (strlen($encoding)) {
$try_encodings = array(
$encoding,
);
} else {
// TODO: This is pretty much a guess, and probably needs to be
// configurable in the long run.
$try_encodings = array(
'JIS',
'EUC-JP',
'SJIS',
'ISO-8859-1',
);
}
$guess = mb_detect_encoding($string, $try_encodings);
if ($guess) {
return mb_convert_encoding($string, 'UTF-8', $guess);
}
}
return phutil_utf8ize($string);
}
protected function willReadData(array &$data) {
parent::willReadData($data);
static $custom;
if ($custom === null) {
$custom = $this->getConfigOption(self::CONFIG_APPLICATION_SERIALIZERS);
}
if ($custom) {
foreach ($custom as $key => $serializer) {
$data[$key] = $serializer->willReadValue($data[$key]);
}
}
}
protected function willWriteData(array &$data) {
static $custom;
if ($custom === null) {
$custom = $this->getConfigOption(self::CONFIG_APPLICATION_SERIALIZERS);
}
if ($custom) {
foreach ($custom as $key => $serializer) {
$data[$key] = $serializer->willWriteValue($data[$key]);
}
}
parent::willWriteData($data);
}
}

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