<?php
/**
* Simple object-authoritative data access object that makes it easy to build
* stuff that you need to save to a database. Basically, it means that the
* amount of boilerplate code (and, particularly, boilerplate SQL) you need
* to write is greatly reduced.
*
* Lisk makes it fairly easy to build something quickly and end up with
* reasonably high-quality code when you're done (e.g., getters and setters,
* objects, transactions, reasonably structured OO code). It's also very thin:
* you can break past it and use MySQL and other lower-level tools when you
* need to in those couple of cases where it doesn't handle your workflow
* gracefully.
*
* However, Lisk won't scale past one database and lacks many of the features
* of modern DAOs like Hibernate: for instance, it does not support joins or
* polymorphic storage.
*
* This means that Lisk is well-suited for tools like Differential, but often a
* poor choice elsewhere. And it is strictly unsuitable for many projects.
*
* Lisk's model is object-authoritative: the PHP class definition is the
* master authority for what the object looks like.
*
* =Building New Objects=
*
* To create new Lisk objects, extend @{class:LiskDAO} and implement
* @{method:establishLiveConnection}. It should return an
* @{class:AphrontDatabaseConnection}; this will tell Lisk where to save your
* objects.
*
* class Dog extends LiskDAO {
*
* protected $name;
* protected $breed;
*
* public function establishLiveConnection() {
* return $some_connection_object;
* }
* }
*
* Now, you should create your table:
*
* lang=sql
* CREATE TABLE dog (
* id int unsigned not null auto_increment primary key,
* name varchar(32) not null,
* breed varchar(32) not null,
* dateCreated int unsigned not null,
* dateModified int unsigned not null
* );
*
* For each property in your class, add a column with the same name to the table
* (see @{method:getConfiguration} for information about changing this mapping).
* Additionally, you should create the three columns `id`, `dateCreated` and
* `dateModified`. Lisk will automatically manage these, using them to implement
* autoincrement IDs and timestamps. If you do not want to use these features,
* see @{method:getConfiguration} for information on disabling them. At a bare
* minimum, you must normally have an `id` column which is a primary or unique
* key with a numeric type, although you can change its name by overriding
* @{method:getIDKey} or disable it entirely by overriding @{method:getIDKey} to
* return null. Note that many methods rely on a single-part primary key and
* will no longer work (they will throw) if you disable it.
*
* As you add more properties to your class in the future, remember to add them
* to the database table as well.
*
* Lisk will now automatically handle these operations: getting and setting
* properties, saving objects, loading individual objects, loading groups
* of objects, updating objects, managing IDs, updating timestamps whenever
* an object is created or modified, and some additional specialized
* operations.
*
* = Creating, Retrieving, Updating, and Deleting =
*
* To create and persist a Lisk object, use @{method:save}:
*
* $dog = id(new Dog())
* ->setName('Sawyer')
* ->setBreed('Pug')
* ->save();
*
* Note that **Lisk automatically builds getters and setters for all of your
* object's protected properties** via @{method:__call}. If you want to add
* custom behavior to your getters or setters, you can do so by overriding the
* @{method:readField} and @{method:writeField} methods.
*
* Calling @{method:save} will persist the object to the database. After calling
* @{method:save}, you can call @{method:getID} to retrieve the object's ID.
*
* To load objects by ID, use the @{method:load} method:
*
* $dog = id(new Dog())->load($id);
*
* This will load the Dog record with ID $id into $dog, or `null` if no such
* record exists (@{method:load} is an instance method rather than a static
* method because PHP does not support late static binding, at least until PHP
* 5.3).
*
* To update an object, change its properties and save it:
*
* $dog->setBreed('Lab')->save();
*
* To delete an object, call @{method:delete}:
*
* $dog->delete();
*
* That's Lisk CRUD in a nutshell.
*
* = Queries =
*
* Often, you want to load a bunch of objects, or execute a more specialized
* query. Use @{method:loadAllWhere} or @{method:loadOneWhere} to do this:
*
* $pugs = $dog->loadAllWhere('breed = %s', 'Pug');
* $sawyer = $dog->loadOneWhere('name = %s', 'Sawyer');
*
* These methods work like @{function@arcanist:queryfx}, but only take half of
* a query (the part after the WHERE keyword). Lisk will handle the connection,
* columns, and object construction; you are responsible for the rest of it.
* @{method:loadAllWhere} returns a list of objects, while
* @{method:loadOneWhere} returns a single object (or `null`).
*
* There's also a @{method:loadRelatives} method which helps to prevent the 1+N
* queries problem.
*
* = Managing Transactions =
*
* Lisk uses a transaction stack, so code does not generally need to be aware
* of the transactional state of objects to implement correct transaction
* semantics:
*
* $obj->openTransaction();
* $obj->save();
* $other->save();
* // ...
* $other->openTransaction();
* $other->save();
* $another->save();
* if ($some_condition) {
* $other->saveTransaction();
* } else {
* $other->killTransaction();
* }
* // ...
* $obj->saveTransaction();
*
* Assuming ##$obj##, ##$other## and ##$another## live on the same database,
* this code will work correctly by establishing savepoints.
*
* Selects whose data are used later in the transaction should be included in
* @{method:beginReadLocking} or @{method:beginWriteLocking} block.
*
* @task conn Managing Connections
* @task config Configuring Lisk
* @task load Loading Objects
* @task info Examining Objects
* @task save Writing Objects
* @task hook Hooks and Callbacks
* @task util Utilities
* @task xaction Managing Transactions
* @task isolate Isolation for Unit Testing
*/
abstract class LiskDAO extends Phobject
implements AphrontDatabaseTableRefInterface {
const CONFIG_IDS = 'id-mechanism';
const CONFIG_TIMESTAMPS = 'timestamps';
const CONFIG_AUX_PHID = 'auxiliary-phid';
const CONFIG_SERIALIZATION = 'col-serialization';
const CONFIG_BINARY = 'binary';
const CONFIG_COLUMN_SCHEMA = 'col-schema';
const CONFIG_KEY_SCHEMA = 'key-schema';
const CONFIG_NO_TABLE = 'no-table';
const CONFIG_NO_MUTATE = 'no-mutate';
const SERIALIZATION_NONE = 'id';
const SERIALIZATION_JSON = 'json';
const SERIALIZATION_PHP = 'php';
const IDS_AUTOINCREMENT = 'ids-auto';
const IDS_COUNTER = 'ids-counter';
const IDS_MANUAL = 'ids-manual';
const COUNTER_TABLE_NAME = 'lisk_counter';
private static $processIsolationLevel = 0;
private static $transactionIsolationLevel = 0;
private $ephemeral = false;
private $forcedConnection;
private static $connections = array();
private static $liskMetadata = array();
protected $id;
protected $phid;
protected $dateCreated;
protected $dateModified;
/**
* Build an empty object.
*
* @return obj Empty object.
*/
public function __construct() {
$id_key = $this->getIDKey();
if ($id_key) {
$this->$id_key = null;
}
}
/* -( Managing Connections )----------------------------------------------- */
/**
* Establish a live connection to a database service. This method should
* return a new connection. Lisk handles connection caching and management;
* do not perform caching deeper in the stack.
*
* @param string Mode, either 'r' (reading) or 'w' (reading and writing).
* @return AphrontDatabaseConnection New database connection.
* @task conn
*/
abstract protected function establishLiveConnection($mode);
/**
* Return a namespace for this object's connections in the connection cache.
* Generally, the database name is appropriate. Two connections are considered
* equivalent if they have the same connection namespace and mode.
*
* @return string Connection namespace for cache
* @task conn
*/
protected function getConnectionNamespace() {
return $this->getDatabaseName();
}
abstract protected function getDatabaseName();
/**
* Get an existing, cached connection for this object.
*
* @param mode Connection mode.
* @return AphrontDatabaseConnection|null Connection, if it exists in cache.
* @task conn
*/
protected function getEstablishedConnection($mode) {
$key = $this->getConnectionNamespace().':'.$mode;
if (isset(self::$connections[$key])) {
return self::$connections[$key];
}
return null;
}
/**
* Store a connection in the connection cache.
*
* @param mode Connection mode.
* @param AphrontDatabaseConnection Connection to cache.
* @return this
* @task conn
*/
protected function setEstablishedConnection(
$mode,
AphrontDatabaseConnection $connection,
$force_unique = false) {
$key = $this->getConnectionNamespace().':'.$mode;
if ($force_unique) {
$key .= ':unique';
while (isset(self::$connections[$key])) {
$key .= '!';
}
}
self::$connections[$key] = $connection;
return $this;
}
/**
* Force an object to use a specific connection.
*
* This overrides all connection management and forces the object to use
* a specific connection when interacting with the database.
*
* @param AphrontDatabaseConnection Connection to force this object to use.
* @task conn
*/
public function setForcedConnection(AphrontDatabaseConnection $connection) {
$this->forcedConnection = $connection;
return $this;
}
/* -( Configuring Lisk )--------------------------------------------------- */
/**
* Change Lisk behaviors, like ID configuration and timestamps. If you want
* to change these behaviors, you should override this method in your child
* class and change the options you're interested in. For example:
*
* protected function getConfiguration() {
* return array(
* Lisk_DataAccessObject::CONFIG_EXAMPLE => true,
* ) + parent::getConfiguration();
* }
*
* The available options are:
*
* CONFIG_IDS
* Lisk objects need to have a unique identifying ID. The three mechanisms
* available for generating this ID are IDS_AUTOINCREMENT (default, assumes
* the ID column is an autoincrement primary key), IDS_MANUAL (you are taking
* full responsibility for ID management), or IDS_COUNTER (see below).
*
* InnoDB does not persist the value of `auto_increment` across restarts,
* and instead initializes it to `MAX(id) + 1` during startup. This means it
* may reissue the same autoincrement ID more than once, if the row is deleted
* and then the database is restarted. To avoid this, you can set an object to
* use a counter table with IDS_COUNTER. This will generally behave like
* IDS_AUTOINCREMENT, except that the counter value will persist across
* restarts and inserts will be slightly slower. If a database stores any
* DAOs which use this mechanism, you must create a table there with this
* schema:
*
* CREATE TABLE lisk_counter (
* counterName VARCHAR(64) COLLATE utf8_bin PRIMARY KEY,
* counterValue BIGINT UNSIGNED NOT NULL
* ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
*
* CONFIG_TIMESTAMPS
* Lisk can automatically handle keeping track of a `dateCreated' and
* `dateModified' column, which it will update when it creates or modifies
* an object. If you don't want to do this, you may disable this option.
* By default, this option is ON.
*
* CONFIG_AUX_PHID
* This option can be enabled by being set to some truthy value. The meaning
* of this value is defined by your PHID generation mechanism. If this option
* is enabled, a `phid' property will be populated with a unique PHID when an
* object is created (or if it is saved and does not currently have one). You
* need to override generatePHID() and hook it into your PHID generation
* mechanism for this to work. By default, this option is OFF.
*
* CONFIG_SERIALIZATION
* You can optionally provide a column serialization map that will be applied
* to values when they are written to the database. For example:
*
* self::CONFIG_SERIALIZATION => array(
* 'complex' => self::SERIALIZATION_JSON,
* )
*
* This will cause Lisk to JSON-serialize the 'complex' field before it is
* written, and unserialize it when it is read.
*
* CONFIG_BINARY
* You can optionally provide a map of columns to a flag indicating that
* they store binary data. These columns will not raise an error when
* handling binary writes.
*
* CONFIG_COLUMN_SCHEMA
* Provide a map of columns to schema column types.
*
* CONFIG_KEY_SCHEMA
* Provide a map of key names to key specifications.
*
* CONFIG_NO_TABLE
* Allows you to specify that this object does not actually have a table in
* the database.
*
* CONFIG_NO_MUTATE
* Provide a map of columns which should not be included in UPDATE statements.
* If you have some columns which are always written to explicitly and should
* never be overwritten by a save(), you can specify them here. This is an
* advanced, specialized feature and there are usually better approaches for
* most locking/contention problems.
*
* @return dictionary Map of configuration options to values.
*
* @task config
*/
protected function getConfiguration() {
return array(
self::CONFIG_IDS => self::IDS_AUTOINCREMENT,
self::CONFIG_TIMESTAMPS => true,
);
}
/**
* Determine the setting of a configuration option for this class of objects.
*
* @param const Option name, one of the CONFIG_* constants.
* @return mixed Option value, if configured (null if unavailable).
*
* @task config
*/
public function getConfigOption($option_name) {
$options = $this->getLiskMetadata('config');
if ($options === null) {
$options = $this->getConfiguration();
$this->setLiskMetadata('config', $options);
}
return idx($options, $option_name);
}
/* -( Loading Objects )---------------------------------------------------- */
/**
* Load an object by ID. You need to invoke this as an instance method, not
* a class method, because PHP doesn't have late static binding (until
* PHP 5.3.0). For example:
*
* $dog = id(new Dog())->load($dog_id);
*
* @param int Numeric ID identifying the object to load.
* @return obj|null Identified object, or null if it does not exist.
*
* @task load
*/
public function load($id) {
if (is_object($id)) {
$id = (string)$id;
}
if (!$id || (!is_int($id) && !ctype_digit($id))) {
return null;
}
return $this->loadOneWhere(
'%C = %d',
$this->getIDKey(),
$id);
}
/**
* Loads all of the objects, unconditionally.
*
* @return dict Dictionary of all persisted objects of this type, keyed
* on object ID.
*
* @task load
*/
public function loadAll() {
return $this->loadAllWhere('1 = 1');
}
/**
* Load all objects which match a WHERE clause. You provide everything after
* the 'WHERE'; Lisk handles everything up to it. For example:
*
* $old_dogs = id(new Dog())->loadAllWhere('age > %d', 7);
*
* The pattern and arguments are as per queryfx().
*
* @param string queryfx()-style SQL WHERE clause.
* @param ... Zero or more conversions.
* @return dict Dictionary of matching objects, keyed on ID.
*
* @task load
*/
public function loadAllWhere($pattern /* , $arg, $arg, $arg ... */) {
$args = func_get_args();
$data = call_user_func_array(
array($this, 'loadRawDataWhere'),
$args);
return $this->loadAllFromArray($data);
}
/**
* Load a single object identified by a 'WHERE' clause. You provide
* everything after the 'WHERE', and Lisk builds the first half of the
* query. See loadAllWhere(). This method is similar, but returns a single
* result instead of a list.
*
* @param string queryfx()-style SQL WHERE clause.
* @param ... Zero or more conversions.
* @return obj|null Matching object, or null if no object matches.
*
* @task load
*/
public function loadOneWhere($pattern /* , $arg, $arg, $arg ... */) {
$args = func_get_args();
$data = call_user_func_array(
array($this, 'loadRawDataWhere'),
$args);
if (count($data) > 1) {
throw new AphrontCountQueryException(
pht(
'More than one result from %s!',
__FUNCTION__.'()'));
}
$data = reset($data);
if (!$data) {
return null;
}
return $this->loadFromArray($data);
}
protected function loadRawDataWhere($pattern /* , $args... */) {
$conn = $this->establishConnection('r');
if ($conn->isReadLocking()) {
$lock_clause = qsprintf($conn, 'FOR UPDATE');
} else if ($conn->isWriteLocking()) {
$lock_clause = qsprintf($conn, 'LOCK IN SHARE MODE');
} else {
$lock_clause = qsprintf($conn, '');
}
$args = func_get_args();
$args = array_slice($args, 1);
$pattern = 'SELECT * FROM %R WHERE '.$pattern.' %Q';
array_unshift($args, $this);
array_push($args, $lock_clause);
array_unshift($args, $pattern);
return call_user_func_array(array($conn, 'queryData'), $args);
}
/**
* Reload an object from the database, discarding any changes to persistent
* properties. This is primarily useful after entering a transaction but
* before applying changes to an object.
*
* @return this
*
* @task load
*/
public function reload() {
if (!$this->getID()) {
throw new Exception(
pht("Unable to reload object that hasn't been loaded!"));
}
$result = $this->loadOneWhere(
'%C = %d',
$this->getIDKey(),
$this->getID());
if (!$result) {
throw new AphrontObjectMissingQueryException();
}
return $this;
}
/**
* Initialize this object's properties from a dictionary. Generally, you
* load single objects with loadOneWhere(), but sometimes it may be more
* convenient to pull data from elsewhere directly (e.g., a complicated
* join via @{method:queryData}) and then load from an array representation.
*
* @param dict Dictionary of properties, which should be equivalent to
* selecting a row from the table or calling
* @{method:getProperties}.
* @return this
*
* @task load
*/
public function loadFromArray(array $row) {
$valid_map = $this->getLiskMetadata('validMap', array());
$map = array();
$updated = false;
foreach ($row as $k => $v) {
// We permit (but ignore) extra properties in the array because a
// common approach to building the array is to issue a raw SELECT query
// which may include extra explicit columns or joins.
// This pathway is very hot on some pages, so we're inlining a cache
// and doing some microoptimization to avoid a strtolower() call for each
// assignment. The common path (assigning a valid property which we've
// already seen) always incurs only one empty(). The second most common
// path (assigning an invalid property which we've already seen) costs
// an empty() plus an isset().
if (empty($valid_map[$k])) {
if (isset($valid_map[$k])) {
// The value is set but empty, which means it's false, so we've
// already determined it's not valid. We don't need to check again.
continue;
}
$valid_map[$k] = $this->hasProperty($k);
$updated = true;
if (!$valid_map[$k]) {
continue;
}
}
$map[$k] = $v;
}
if ($updated) {
$this->setLiskMetadata('validMap', $valid_map);
}
$this->willReadData($map);
foreach ($map as $prop => $value) {
$this->$prop = $value;
}
$this->didReadData();
return $this;
}
/**
* Initialize a list of objects from a list of dictionaries. Usually you
* load lists of objects with @{method:loadAllWhere}, but sometimes that
* isn't flexible enough. One case is if you need to do joins to select the
* right objects:
*
* function loadAllWithOwner($owner) {
* $data = $this->queryData(
* 'SELECT d.*
* FROM owner o
* JOIN owner_has_dog od ON o.id = od.ownerID
* JOIN dog d ON od.dogID = d.id
* WHERE o.id = %d',
* $owner);
* return $this->loadAllFromArray($data);
* }
*
* This is a lot messier than @{method:loadAllWhere}, but more flexible.
*
* @param list List of property dictionaries.
* @return dict List of constructed objects, keyed on ID.
*
* @task load
*/
public function loadAllFromArray(array $rows) {
$result = array();
$id_key = $this->getIDKey();
foreach ($rows as $row) {
$obj = clone $this;
if ($id_key && isset($row[$id_key])) {
$row_id = $row[$id_key];
if (isset($result[$row_id])) {
throw new Exception(
pht(
'Rows passed to "loadAllFromArray(...)" include two or more '.
'rows with the same ID ("%s"). Rows must have unique IDs. '.
'An underlying query may be missing a GROUP BY.',
$row_id));
}
$result[$row_id] = $obj->loadFromArray($row);
} else {
$result[] = $obj->loadFromArray($row);
}
}
return $result;
}
/* -( Examining Objects )-------------------------------------------------- */
/**
* Set unique ID identifying this object. You normally don't need to call this
* method unless with `IDS_MANUAL`.
*
* @param mixed Unique ID.
* @return this
* @task save
*/
public function setID($id) {
$id_key = $this->getIDKey();
$this->$id_key = $id;
return $this;
}
/**
* Retrieve the unique ID identifying this object. This value will be null if
* the object hasn't been persisted and you didn't set it manually.
*
* @return mixed Unique ID.
*
* @task info
*/
public function getID() {
$id_key = $this->getIDKey();
return $this->$id_key;
}
public function getPHID() {
return $this->phid;
}
/**
* Test if a property exists.
*
* @param string Property name.
* @return bool True if the property exists.
* @task info
*/
public function hasProperty($property) {
return (bool)$this->checkProperty($property);
}
/**
* Retrieve a list of all object properties. This list only includes
* properties that are declared as protected, and it is expected that
* all properties returned by this function should be persisted to the
* database.
* Properties that should not be persisted must be declared as private.
*
* @return dict Dictionary of normalized (lowercase) to canonical (original
* case) property names.
*
* @task info
*/
protected function getAllLiskProperties() {
$properties = $this->getLiskMetadata('properties');
if ($properties === null) {
$class = new ReflectionClass(static::class);
$properties = array();
foreach ($class->getProperties(ReflectionProperty::IS_PROTECTED) as $p) {
$properties[strtolower($p->getName())] = $p->getName();
}
$id_key = $this->getIDKey();
if ($id_key != 'id') {
unset($properties['id']);
}
if (!$this->getConfigOption(self::CONFIG_TIMESTAMPS)) {
unset($properties['datecreated']);
unset($properties['datemodified']);
}
if ($id_key != 'phid' && !$this->getConfigOption(self::CONFIG_AUX_PHID)) {
unset($properties['phid']);
}
$this->setLiskMetadata('properties', $properties);
}
return $properties;
}
/**
* Check if a property exists on this object.
*
* @return string|null Canonical property name, or null if the property
* does not exist.
*
* @task info
*/
protected function checkProperty($property) {
$properties = $this->getAllLiskProperties();
$property = strtolower($property);
if (empty($properties[$property])) {
return null;
}
return $properties[$property];
}
/**
* Get or build the database connection for this object.
*
* @param string 'r' for read, 'w' for read/write.
* @param bool True to force a new connection. The connection will not
* be retrieved from or saved into the connection cache.
* @return AphrontDatabaseConnection Lisk connection object.
*
* @task info
*/
public function establishConnection($mode, $force_new = false) {
if ($mode != 'r' && $mode != 'w') {
throw new Exception(
pht(
"Unknown mode '%s', should be 'r' or 'w'.",
$mode));
}
if ($this->forcedConnection) {
return $this->forcedConnection;
}
if (self::shouldIsolateAllLiskEffectsToCurrentProcess()) {
$mode = 'isolate-'.$mode;
$connection = $this->getEstablishedConnection($mode);
if (!$connection) {
$connection = $this->establishIsolatedConnection($mode);
$this->setEstablishedConnection($mode, $connection);
}
return $connection;
}
if (self::shouldIsolateAllLiskEffectsToTransactions()) {
// If we're doing fixture transaction isolation, force the mode to 'w'
// so we always get the same connection for reads and writes, and thus
// can see the writes inside the transaction.
$mode = 'w';
}
// TODO: There is currently no protection on 'r' queries against writing.
$connection = null;
if (!$force_new) {
if ($mode == 'r') {
// If we're requesting a read connection but already have a write
// connection, reuse the write connection so that reads can take place
// inside transactions.
$connection = $this->getEstablishedConnection('w');
}
if (!$connection) {
$connection = $this->getEstablishedConnection($mode);
}
}
if (!$connection) {
$connection = $this->establishLiveConnection($mode);
if (self::shouldIsolateAllLiskEffectsToTransactions()) {
$connection->openTransaction();
}
$this->setEstablishedConnection(
$mode,
$connection,
$force_unique = $force_new);
}
return $connection;
}
/**
* Convert this object into a property dictionary. This dictionary can be
* restored into an object by using @{method:loadFromArray} (unless you're
* using legacy features with CONFIG_CONVERT_CAMELCASE, but in that case you
* should just go ahead and die in a fire).
*
* @return dict Dictionary of object properties.
*
* @task info
*/
protected function getAllLiskPropertyValues() {
$map = array();
foreach ($this->getAllLiskProperties() as $p) {
// We may receive a warning here for properties we've implicitly added
// through configuration; squelch it.
$map[$p] = @$this->$p;
}
return $map;
}
/* -( Writing Objects )---------------------------------------------------- */
/**
* Make an object read-only.
*
* Making an object ephemeral indicates that you will be changing state in
* such a way that you would never ever want it to be written back to the
* storage.
*/
public function makeEphemeral() {
$this->ephemeral = true;
return $this;
}
private function isEphemeralCheck() {
if ($this->ephemeral) {
throw new LiskEphemeralObjectException();
}
}
/**
* Persist this object to the database. In most cases, this is the only
* method you need to call to do writes. If the object has not yet been
* inserted this will do an insert; if it has, it will do an update.
*
* @return this
*
* @task save
*/
public function save() {
if ($this->shouldInsertWhenSaved()) {
return $this->insert();
} else {
return $this->update();
}
}
/**
* Save this object, forcing the query to use REPLACE regardless of object
* state.
*
* @return this
*
* @task save
*/
public function replace() {
$this->isEphemeralCheck();
return $this->insertRecordIntoDatabase('REPLACE');
}
/**
* Save this object, forcing the query to use INSERT regardless of object
* state.
*
* @return this
*
* @task save
*/
public function insert() {
$this->isEphemeralCheck();
return $this->insertRecordIntoDatabase('INSERT');
}
/**
* Save this object, forcing the query to use UPDATE regardless of object
* state.
*
* @return this
*
* @task save
*/
public function update() {
$this->isEphemeralCheck();
$this->willSaveObject();
$data = $this->getAllLiskPropertyValues();
// Remove columns flagged as nonmutable from the update statement.
$no_mutate = $this->getConfigOption(self::CONFIG_NO_MUTATE);
if ($no_mutate) {
foreach ($no_mutate as $column) {
unset($data[$column]);
}
}
$this->willWriteData($data);
$map = array();
foreach ($data as $k => $v) {
$map[$k] = $v;
}
$conn = $this->establishConnection('w');
$binary = $this->getBinaryColumns();
foreach ($map as $key => $value) {
if (!empty($binary[$key])) {
$map[$key] = qsprintf($conn, '%C = %nB', $key, $value);
} else {
$map[$key] = qsprintf($conn, '%C = %ns', $key, $value);
}
}
$id = $this->getID();
$conn->query(
'UPDATE %R SET %LQ WHERE %C = '.(is_int($id) ? '%d' : '%s'),
$this,
$map,
$this->getIDKey(),
$id);
// We can't detect a missing object because updating an object without
// changing any values doesn't affect rows. We could jiggle timestamps
// to catch this for objects which track them if we wanted.
$this->didWriteData();
return $this;
}
/**
* Delete this object, permanently.
*
* @return this
*
* @task save
*/
public function delete() {
$this->isEphemeralCheck();
$this->willDelete();
$conn = $this->establishConnection('w');
$conn->query(
'DELETE FROM %R WHERE %C = %d',
$this,
$this->getIDKey(),
$this->getID());
$this->didDelete();
return $this;
}
/**
* Internal implementation of INSERT and REPLACE.
*
* @param const Either "INSERT" or "REPLACE", to force the desired mode.
* @return this
*
* @task save
*/
protected function insertRecordIntoDatabase($mode) {
$this->willSaveObject();
$data = $this->getAllLiskPropertyValues();
$conn = $this->establishConnection('w');
$id_mechanism = $this->getConfigOption(self::CONFIG_IDS);
switch ($id_mechanism) {
case self::IDS_AUTOINCREMENT:
// If we are using autoincrement IDs, let MySQL assign the value for the
// ID column, if it is empty. If the caller has explicitly provided a
// value, use it.
$id_key = $this->getIDKey();
if (empty($data[$id_key])) {
unset($data[$id_key]);
}
break;
case self::IDS_COUNTER:
// If we are using counter IDs, assign a new ID if we don't already have
// one.
$id_key = $this->getIDKey();
if (empty($data[$id_key])) {
$counter_name = $this->getTableName();
$id = self::loadNextCounterValue($conn, $counter_name);
$this->setID($id);
$data[$id_key] = $id;
}
break;
case self::IDS_MANUAL:
break;
default:
throw new Exception(pht('Unknown %s mechanism!', 'CONFIG_IDs'));
}
$this->willWriteData($data);
$columns = array_keys($data);
$binary = $this->getBinaryColumns();
foreach ($data as $key => $value) {
try {
if (!empty($binary[$key])) {
$data[$key] = qsprintf($conn, '%nB', $value);
} else {
$data[$key] = qsprintf($conn, '%ns', $value);
}
} catch (AphrontParameterQueryException $parameter_exception) {
throw new PhutilProxyException(
pht(
"Unable to insert or update object of class %s, field '%s' ".
"has a non-scalar value.",
get_class($this),
$key),
$parameter_exception);
}
}
switch ($mode) {
case 'INSERT':
$verb = qsprintf($conn, 'INSERT');
break;
case 'REPLACE':
$verb = qsprintf($conn, 'REPLACE');
break;
default:
throw new Exception(
pht(
'Insert mode verb "%s" is not recognized, use INSERT or REPLACE.',
$mode));
}
$conn->query(
'%Q INTO %R (%LC) VALUES (%LQ)',
$verb,
$this,
$columns,
$data);
// Only use the insert id if this table is using auto-increment ids
if ($id_mechanism === self::IDS_AUTOINCREMENT) {
$this->setID($conn->getInsertID());
}
$this->didWriteData();
return $this;
}
/**
* Method used to determine whether to insert or update when saving.
*
* @return bool true if the record should be inserted
*/
protected function shouldInsertWhenSaved() {
$key_type = $this->getConfigOption(self::CONFIG_IDS);
if ($key_type == self::IDS_MANUAL) {
throw new Exception(
pht(
'You are using manual IDs. You must override the %s method '.
'to properly detect when to insert a new record.',
__FUNCTION__.'()'));
} else {
return !$this->getID();
}
}
/* -( Hooks and Callbacks )------------------------------------------------ */
/**
* Retrieve the database table name. By default, this is the class name.
*
* @return string Table name for object storage.
*
* @task hook
*/
public function getTableName() {
return get_class($this);
}
/**
* Retrieve the primary key column, "id" by default. If you can not
* reasonably name your ID column "id", override this method.
*
* @return string Name of the ID column.
*
* @task hook
*/
public function getIDKey() {
return 'id';
}
/**
* Generate a new PHID, used by CONFIG_AUX_PHID.
*
* @return phid Unique, newly allocated PHID.
*
* @task hook
*/
public function generatePHID() {
$type = $this->getPHIDType();
return PhabricatorPHID::generateNewPHID($type);
}
public function getPHIDType() {
throw new PhutilMethodNotImplementedException();
}
/**
* Hook to apply serialization or validation to data before it is written to
* the database. See also @{method:willReadData}.
*
* @task hook
*/
protected function willWriteData(array &$data) {
$this->applyLiskDataSerialization($data, false);
}
/**
* Hook to perform actions after data has been written to the database.
*
* @task hook
*/
protected function didWriteData() {}
/**
* Hook to make internal object state changes prior to INSERT, REPLACE or
* UPDATE.
*
* @task hook
*/
protected function willSaveObject() {
$use_timestamps = $this->getConfigOption(self::CONFIG_TIMESTAMPS);
if ($use_timestamps) {
if (!$this->getDateCreated()) {
$this->setDateCreated(time());
}
$this->setDateModified(time());
}
if ($this->getConfigOption(self::CONFIG_AUX_PHID) && !$this->getPHID()) {
$this->setPHID($this->generatePHID());
}
}
/**
* Hook to apply serialization or validation to data as it is read from the
* database. See also @{method:willWriteData}.
*
* @task hook
*/
protected function willReadData(array &$data) {
$this->applyLiskDataSerialization($data, $deserialize = true);
}
/**
* Hook to perform an action on data after it is read from the database.
*
* @task hook
*/
protected function didReadData() {}
/**
* Hook to perform an action before the deletion of an object.
*
* @task hook
*/
protected function willDelete() {}
/**
* Hook to perform an action after the deletion of an object.
*
* @task hook
*/
protected function didDelete() {}
/**
* Reads the value from a field. Override this method for custom behavior
* of @{method:getField} instead of overriding getField directly.
*
* @param string Canonical field name
* @return mixed Value of the field
*
* @task hook
*/
protected function readField($field) {
if (isset($this->$field)) {
return $this->$field;
}
return null;
}
/**
* Writes a value to a field. Override this method for custom behavior of
* setField($value) instead of overriding setField directly.
*
* @param string Canonical field name
* @param mixed Value to write
*
* @task hook
*/
protected function writeField($field, $value) {
$this->$field = $value;
}
/* -( Manging Transactions )----------------------------------------------- */
/**
* Increase transaction stack depth.
*
* @return this
*/
public function openTransaction() {
$this->establishConnection('w')->openTransaction();
return $this;
}
/**
* Decrease transaction stack depth, saving work.
*
* @return this
*/
public function saveTransaction() {
$this->establishConnection('w')->saveTransaction();
return $this;
}
/**
* Decrease transaction stack depth, discarding work.
*
* @return this
*/
public function killTransaction() {
$this->establishConnection('w')->killTransaction();
return $this;
}
/**
* Begins read-locking selected rows with SELECT ... FOR UPDATE, so that
* other connections can not read them (this is an enormous oversimplification
* of FOR UPDATE semantics; consult the MySQL documentation for details). To
* end read locking, call @{method:endReadLocking}. For example:
*
* $beach->openTransaction();
* $beach->beginReadLocking();
*
* $beach->reload();
* $beach->setGrainsOfSand($beach->getGrainsOfSand() + 1);
* $beach->save();
*
* $beach->endReadLocking();
* $beach->saveTransaction();
*
* @return this
* @task xaction
*/
public function beginReadLocking() {
$this->establishConnection('w')->beginReadLocking();
return $this;
}
/**
* Ends read-locking that began at an earlier @{method:beginReadLocking} call.
*
* @return this
* @task xaction
*/
public function endReadLocking() {
$this->establishConnection('w')->endReadLocking();
return $this;
}
/**
* Begins write-locking selected rows with SELECT ... LOCK IN SHARE MODE, so
* that other connections can not update or delete them (this is an
* oversimplification of LOCK IN SHARE MODE semantics; consult the
* MySQL documentation for details). To end write locking, call
* @{method:endWriteLocking}.
*
* @return this
* @task xaction
*/
public function beginWriteLocking() {
$this->establishConnection('w')->beginWriteLocking();
return $this;
}
/**
* Ends write-locking that began at an earlier @{method:beginWriteLocking}
* call.
*
* @return this
* @task xaction
*/
public function endWriteLocking() {
$this->establishConnection('w')->endWriteLocking();
return $this;
}
/* -( Isolation )---------------------------------------------------------- */
/**
* @task isolate
*/
public static function beginIsolateAllLiskEffectsToCurrentProcess() {
self::$processIsolationLevel++;
}
/**
* @task isolate
*/
public static function endIsolateAllLiskEffectsToCurrentProcess() {
self::$processIsolationLevel--;
if (self::$processIsolationLevel < 0) {
throw new Exception(
pht('Lisk process isolation level was reduced below 0.'));
}
}
/**
* @task isolate
*/
public static function shouldIsolateAllLiskEffectsToCurrentProcess() {
return (bool)self::$processIsolationLevel;
}
/**
* @task isolate
*/
private function establishIsolatedConnection($mode) {
$config = array();
return new AphrontIsolatedDatabaseConnection($config);
}
/**
* @task isolate
*/
public static function beginIsolateAllLiskEffectsToTransactions() {
if (self::$transactionIsolationLevel === 0) {
self::closeAllConnections();
}
self::$transactionIsolationLevel++;
}
/**
* @task isolate
*/
public static function endIsolateAllLiskEffectsToTransactions() {
self::$transactionIsolationLevel--;
if (self::$transactionIsolationLevel < 0) {
throw new Exception(
pht('Lisk transaction isolation level was reduced below 0.'));
} else if (self::$transactionIsolationLevel == 0) {
foreach (self::$connections as $key => $conn) {
if ($conn) {
$conn->killTransaction();
}
}
self::closeAllConnections();
}
}
/**
* @task isolate
*/
public static function shouldIsolateAllLiskEffectsToTransactions() {
return (bool)self::$transactionIsolationLevel;
}
/**
* Close any connections with no recent activity.
*
* Long-running processes can use this method to clean up connections which
* have not been used recently.
*
* @param int Close connections with no activity for this many seconds.
* @return void
*/
public static function closeInactiveConnections($idle_window) {
$connections = self::$connections;
$now = PhabricatorTime::getNow();
foreach ($connections as $key => $connection) {
// If the connection is not idle, never consider it inactive.
if (!$connection->isIdle()) {
continue;
}
$last_active = $connection->getLastActiveEpoch();
$idle_duration = ($now - $last_active);
if ($idle_duration <= $idle_window) {
continue;
}
self::closeConnection($key);
}
}
public static function closeAllConnections() {
$connections = self::$connections;
foreach ($connections as $key => $connection) {
self::closeConnection($key);
}
}
public static function closeIdleConnections() {
$connections = self::$connections;
foreach ($connections as $key => $connection) {
if (!$connection->isIdle()) {
continue;
}
self::closeConnection($key);
}
}
private static function closeConnection($key) {
if (empty(self::$connections[$key])) {
throw new Exception(
pht(
'No database connection with connection key "%s" exists!',
$key));
}
$connection = self::$connections[$key];
unset(self::$connections[$key]);
$connection->close();
}
/* -( Utilities )---------------------------------------------------------- */
/**
* Applies configured serialization to a dictionary of values.
*
* @task util
*/
protected function applyLiskDataSerialization(array &$data, $deserialize) {
$serialization = $this->getConfigOption(self::CONFIG_SERIALIZATION);
if ($serialization) {
foreach (array_intersect_key($serialization, $data) as $col => $format) {
switch ($format) {
case self::SERIALIZATION_NONE:
break;
case self::SERIALIZATION_PHP:
if ($deserialize) {
$data[$col] = unserialize($data[$col]);
} else {
$data[$col] = serialize($data[$col]);
}
break;
case self::SERIALIZATION_JSON:
if ($deserialize) {
$data[$col] = json_decode($data[$col], true);
} else {
$data[$col] = phutil_json_encode($data[$col]);
}
break;
default:
throw new Exception(
pht("Unknown serialization format '%s'.", $format));
}
}
}
}
/**
* Black magic. Builds implied get*() and set*() for all properties.
*
* @param string Method name.
* @param list Argument vector.
* @return mixed get*() methods return the property value. set*() methods
* return $this.
* @task util
*/
public function __call($method, $args) {
$dispatch_map = $this->getLiskMetadata('dispatchMap', array());
// NOTE: This method is very performance-sensitive (many thousands of calls
// per page on some pages), and thus has some silliness in the name of
// optimizations.
if ($method[0] === 'g') {
if (isset($dispatch_map[$method])) {
$property = $dispatch_map[$method];
} else {
if (substr($method, 0, 3) !== 'get') {
throw new Exception(pht("Unable to resolve method '%s'!", $method));
}
$property = substr($method, 3);
if (!($property = $this->checkProperty($property))) {
throw new Exception(pht('Bad getter call: %s', $method));
}
$dispatch_map[$method] = $property;
$this->setLiskMetadata('dispatchMap', $dispatch_map);
}
return $this->readField($property);
}
if ($method[0] === 's') {
if (isset($dispatch_map[$method])) {
$property = $dispatch_map[$method];
} else {
if (substr($method, 0, 3) !== 'set') {
throw new Exception(pht("Unable to resolve method '%s'!", $method));
}
$property = substr($method, 3);
$property = $this->checkProperty($property);
if (!$property) {
throw new Exception(pht('Bad setter call: %s', $method));
}
$dispatch_map[$method] = $property;
$this->setLiskMetadata('dispatchMap', $dispatch_map);
}
$this->writeField($property, $args[0]);
return $this;
}
throw new Exception(pht("Unable to resolve method '%s'.", $method));
}
/**
* Warns against writing to undeclared property.
*
* @task util
*/
public function __set($name, $value) {
// Hack for policy system hints, see PhabricatorPolicyRule for notes.
if ($name != '_hashKey') {
phlog(
pht(
'Wrote to undeclared property %s.',
get_class($this).'::$'.$name));
}
$this->$name = $value;
}
/**
* Increments a named counter and returns the next value.
*
* @param AphrontDatabaseConnection Database where the counter resides.
* @param string Counter name to create or increment.
* @return int Next counter value.
*
* @task util
*/
public static function loadNextCounterValue(
AphrontDatabaseConnection $conn_w,
$counter_name) {
// NOTE: If an insert does not touch an autoincrement row or call
// LAST_INSERT_ID(), MySQL normally does not change the value of
// LAST_INSERT_ID(). This can cause a counter's value to leak to a
// new counter if the second counter is created after the first one is
// updated. To avoid this, we insert LAST_INSERT_ID(1), to ensure the
// LAST_INSERT_ID() is always updated and always set correctly after the
// query completes.
queryfx(
$conn_w,
'INSERT INTO %T (counterName, counterValue) VALUES
(%s, LAST_INSERT_ID(1))
ON DUPLICATE KEY UPDATE
counterValue = LAST_INSERT_ID(counterValue + 1)',
self::COUNTER_TABLE_NAME,
$counter_name);
return $conn_w->getInsertID();
}
/**
* Returns the current value of a named counter.
*
* @param AphrontDatabaseConnection Database where the counter resides.
* @param string Counter name to read.
* @return int|null Current value, or `null` if the counter does not exist.
*
* @task util
*/
public static function loadCurrentCounterValue(
AphrontDatabaseConnection $conn_r,
$counter_name) {
$row = queryfx_one(
$conn_r,
'SELECT counterValue FROM %T WHERE counterName = %s',
self::COUNTER_TABLE_NAME,
$counter_name);
if (!$row) {
return null;
}
return (int)$row['counterValue'];
}
/**
* Overwrite a named counter, forcing it to a specific value.
*
* If the counter does not exist, it is created.
*
* @param AphrontDatabaseConnection Database where the counter resides.
* @param string Counter name to create or overwrite.
* @return void
*
* @task util
*/
public static function overwriteCounterValue(
AphrontDatabaseConnection $conn_w,
$counter_name,
$counter_value) {
queryfx(
$conn_w,
'INSERT INTO %T (counterName, counterValue) VALUES (%s, %d)
ON DUPLICATE KEY UPDATE counterValue = VALUES(counterValue)',
self::COUNTER_TABLE_NAME,
$counter_name,
$counter_value);
}
private function getBinaryColumns() {
return $this->getConfigOption(self::CONFIG_BINARY);
}
public function getSchemaColumns() {
$custom_map = $this->getConfigOption(self::CONFIG_COLUMN_SCHEMA);
if (!$custom_map) {
$custom_map = array();
}
$serialization = $this->getConfigOption(self::CONFIG_SERIALIZATION);
if (!$serialization) {
$serialization = array();
}
$serialization_map = array(
self::SERIALIZATION_JSON => 'text',
self::SERIALIZATION_PHP => 'bytes',
);
$binary_map = $this->getBinaryColumns();
$id_mechanism = $this->getConfigOption(self::CONFIG_IDS);
if ($id_mechanism == self::IDS_AUTOINCREMENT) {
$id_type = 'auto';
} else {
$id_type = 'id';
}
$builtin = array(
'id' => $id_type,
'phid' => 'phid',
'viewPolicy' => 'policy',
'editPolicy' => 'policy',
'epoch' => 'epoch',
'dateCreated' => 'epoch',
'dateModified' => 'epoch',
);
$map = array();
foreach ($this->getAllLiskProperties() as $property) {
// First, use types specified explicitly in the table configuration.
if (array_key_exists($property, $custom_map)) {
$map[$property] = $custom_map[$property];
continue;
}
// If we don't have an explicit type, try a builtin type for the
// column.
$type = idx($builtin, $property);
if ($type) {
$map[$property] = $type;
continue;
}
// If the column has serialization, we can infer the column type.
if (isset($serialization[$property])) {
$type = idx($serialization_map, $serialization[$property]);
if ($type) {
$map[$property] = $type;
continue;
}
}
if (isset($binary_map[$property])) {
$map[$property] = 'bytes';
continue;
}
if ($property === 'spacePHID') {
$map[$property] = 'phid?';
continue;
}
// If the column is named `somethingPHID`, infer it is a PHID.
if (preg_match('/[a-z]PHID$/', $property)) {
$map[$property] = 'phid';
continue;
}
// If the column is named `somethingID`, infer it is an ID.
if (preg_match('/[a-z]ID$/', $property)) {
$map[$property] = 'id';
continue;
}
// We don't know the type of this column.
$map[$property] = PhabricatorConfigSchemaSpec::DATATYPE_UNKNOWN;
}
return $map;
}
public function getSchemaKeys() {
$custom_map = $this->getConfigOption(self::CONFIG_KEY_SCHEMA);
if (!$custom_map) {
$custom_map = array();
}
$default_map = array();
foreach ($this->getAllLiskProperties() as $property) {
switch ($property) {
case 'id':
$default_map['PRIMARY'] = array(
'columns' => array('id'),
'unique' => true,
);
break;
case 'phid':
$default_map['key_phid'] = array(
'columns' => array('phid'),
'unique' => true,
);
break;
case 'spacePHID':
$default_map['key_space'] = array(
'columns' => array('spacePHID'),
);
break;
}
}
return $custom_map + $default_map;
}
public function getColumnMaximumByteLength($column) {
$map = $this->getSchemaColumns();
if (!isset($map[$column])) {
throw new Exception(
pht(
'Object (of class "%s") does not have a column "%s".',
get_class($this),
$column));
}
$data_type = $map[$column];
return id(new PhabricatorStorageSchemaSpec())
->getMaximumByteLengthForDataType($data_type);
}
public function getSchemaPersistence() {
return null;
}
/* -( AphrontDatabaseTableRefInterface )----------------------------------- */
public function getAphrontRefDatabaseName() {
return $this->getDatabaseName();
}
public function getAphrontRefTableName() {
return $this->getTableName();
}
private function getLiskMetadata($key, $default = null) {
if (isset(self::$liskMetadata[static::class][$key])) {
return self::$liskMetadata[static::class][$key];
}
if (!isset(self::$liskMetadata[static::class])) {
self::$liskMetadata[static::class] = array();
}
return idx(self::$liskMetadata[static::class], $key, $default);
}
private function setLiskMetadata($key, $value) {
self::$liskMetadata[static::class][$key] = $value;
}
}