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PhabricatorLiskDAO.php
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Created
Fri, Jan 10, 19:06

PhabricatorLiskDAO.php
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<?php
/**
* @task edges Managing Edges
* @task config Configuring Storage
*/
abstract class PhabricatorLiskDAO extends LiskDAO {
private $edges = array();
private static $namespaceStack = array();
/* -( Managing Edges )----------------------------------------------------- */
/**
* @task edges
*/
public function attachEdges(array $edges) {
foreach ($edges as $type => $type_edges) {
$this->edges[$type] = $type_edges;
}
return $this;
}
/**
* @task edges
*/
public function getEdges($type) {
$edges = idx($this->edges, $type);
if ($edges === null) {
throw new Exception("Call attachEdges() before getEdges()!");
}
return $edges;
}
/**
* @task edges
*/
public function loadRelativeEdges($type) {
if (!$this->getInSet()) {
id(new LiskDAOSet())->addToSet($this);
}
$this->getInSet()->loadRelativeEdges($type);
return $this->getEdges($type);
}
/**
* @task edges
*/
public function getEdgePHIDs($type) {
return ipull($this->getEdges($type), 'dst');
}
/* -( Configuring Storage )------------------------------------------------ */
/**
* @task config
*/
public static function pushStorageNamespace($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("No storage namespace configured!");
}
return $namespace;
}
/**
* @task config
*/
public function establishLiveConnection($mode) {
$namespace = self::getStorageNamespace();
$conf = PhabricatorEnv::newObjectFromConfig(
'mysql.configuration-provider',
array($this, $mode, $namespace));
return PhabricatorEnv::newObjectFromConfig(
'mysql.implementation',
array(
array(
'user' => $conf->getUser(),
'pass' => $conf->getPassword(),
'host' => $conf->getHost(),
'database' => $conf->getDatabase(),
'retries' => 3,
),
));
}
/**
* @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;
}
}

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