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Drive query ordering and paging more cohesively
Summary: Ref T7803. Ordering and paging are inherently intertwined, but they often aren't driven by the same data right now. Start driving them through the same data: - `getOrderableColumns()` defines orderable and pageable columns. - `getPagingValueMap()` reads values from a cursor. This is generally sufficient to implement both paging and ordering. Also, add some more sanity checks to try to curtail the number of ambiguous/invalid orderings applications produce, since these cause subtle/messy bugs. Test Plan: - Paged through pastes and a few other object types. - Intentionally changed defaults to be invalid and hit some of the errors. Reviewers: btrahan Reviewed By: btrahan Subscribers: epriestley Maniphest Tasks: T7803 Differential Revision: https://secure.phabricator.com/D12355
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2 changed files with 135 additions and 26 deletions
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@ -72,7 +72,7 @@ final class PhabricatorQueryOrderVector
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'Order vector "%s" specifies order "%s" twice. Each component '.
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'of an ordering must be unique.',
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implode(', ', $vector),
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$item));
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$item->getOrderKey()));
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}
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$items[$item->getOrderKey()] = $item;
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@ -84,6 +84,14 @@ final class PhabricatorQueryOrderVector
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return $obj;
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}
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public function getAsString() {
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$scalars = array();
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foreach ($this->items as $item) {
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$scalars[] = $item->getAsScalar();
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}
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return implode(', ', $scalars);
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}
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/* -( Iterator Interface )------------------------------------------------- */
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@ -5,6 +5,7 @@
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* performant than offset-based paging in the presence of policy filtering.
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*
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* @task appsearch Integration with ApplicationSearch
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* @task paging Paging
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* @task order Result Ordering
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*/
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abstract class PhabricatorCursorPagedPolicyAwareQuery
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@ -111,28 +112,6 @@ abstract class PhabricatorCursorPagedPolicyAwareQuery
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}
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}
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protected function buildPagingClause(
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AphrontDatabaseConnection $conn_r) {
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if ($this->beforeID) {
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return qsprintf(
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$conn_r,
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'%Q %Q %s',
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$this->getPagingColumn(),
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$this->getReversePaging() ? '<' : '>',
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$this->beforeID);
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} else if ($this->afterID) {
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return qsprintf(
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$conn_r,
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'%Q %Q %s',
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$this->getPagingColumn(),
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$this->getReversePaging() ? '>' : '<',
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$this->afterID);
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}
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return null;
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}
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final protected function didLoadResults(array $results) {
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if ($this->beforeID) {
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$results = array_reverse($results, $preserve_keys = true);
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@ -168,6 +147,89 @@ abstract class PhabricatorCursorPagedPolicyAwareQuery
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}
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/* -( Paging )------------------------------------------------------------- */
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protected function buildPagingClause(AphrontDatabaseConnection $conn) {
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$orderable = $this->getOrderableColumns();
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// TODO: Remove this once subqueries modernize.
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if (!$orderable) {
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if ($this->beforeID) {
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return qsprintf(
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$conn,
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'%Q %Q %s',
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$this->getPagingColumn(),
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$this->getReversePaging() ? '<' : '>',
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$this->beforeID);
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} else if ($this->afterID) {
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return qsprintf(
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$conn,
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'%Q %Q %s',
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$this->getPagingColumn(),
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$this->getReversePaging() ? '>' : '<',
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$this->afterID);
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} else {
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return null;
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}
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}
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$vector = $this->getOrderVector();
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if ($this->beforeID !== null) {
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$cursor = $this->beforeID;
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$reversed = true;
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} else if ($this->afterID !== null) {
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$cursor = $this->afterID;
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$reversed = false;
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} else {
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// No paging is being applied to this query so we do not need to
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// construct a paging clause.
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return '';
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}
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$keys = array();
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foreach ($vector as $order) {
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$keys[] = $order->getOrderKey();
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}
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$value_map = $this->getPagingValueMap($cursor, $keys);
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$columns = array();
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foreach ($vector as $order) {
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$key = $order->getOrderKey();
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if (!array_key_exists($key, $value_map)) {
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throw new Exception(
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pht(
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'Query "%s" failed to return a value from getPagingValueMap() '.
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'for column "%s".',
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get_class($this),
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$key));
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}
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$column = $orderable[$key];
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$column['value'] = $value_map[$key];
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$columns[] = $column;
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}
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return $this->buildPagingClauseFromMultipleColumns(
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$conn,
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$columns,
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array(
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'reversed' => $reversed,
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));
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}
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protected function getPagingValueMap($cursor, array $keys) {
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// TODO: This is a hack to make this work with existing classes for now.
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return array(
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'id' => $cursor,
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);
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}
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/**
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* Simplifies the task of constructing a paging clause across multiple
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* columns. In the general case, this looks like:
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@ -214,11 +276,12 @@ abstract class PhabricatorCursorPagedPolicyAwareQuery
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PhutilTypeSpec::checkMap(
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$column,
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array(
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'table' => 'optional string',
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'table' => 'optional string|null',
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'column' => 'string',
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'value' => 'wild',
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'type' => 'string',
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'reverse' => 'optional bool',
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'unique' => 'optional bool',
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));
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}
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@ -298,8 +361,11 @@ abstract class PhabricatorCursorPagedPolicyAwareQuery
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$vector = PhabricatorQueryOrderVector::newFromVector($vector);
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$orderable = $this->getOrderableColumns();
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// Make sure that all the components identify valid columns.
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$unique = array();
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foreach ($vector as $order) {
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$key = $vector->getOrderKey();
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$key = $order->getOrderKey();
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if (empty($orderable[$key])) {
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$valid = implode(', ', array_keys($orderable));
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throw new Exception(
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@ -307,8 +373,38 @@ abstract class PhabricatorCursorPagedPolicyAwareQuery
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'This query ("%s") does not support sorting by order key "%s". '.
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'Supported orders are: %s.',
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get_class($this),
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$key,
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$valid));
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}
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$unique[$key] = idx($orderable[$key], 'unique', false);
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}
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// Make sure that the last column is unique so that this is a strong
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// ordering which can be used for paging.
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$last = last($unique);
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if ($last !== true) {
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throw new Exception(
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pht(
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'Order vector "%s" is invalid: the last column in an order must '.
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'be a column with unique values, but "%s" is not unique.',
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$vector->getAsString(),
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last_key($unique)));
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}
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// Make sure that other columns are not unique; an ordering like "id, name"
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// does not make sense because only "id" can ever have an effect.
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array_pop($unique);
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foreach ($unique as $key => $is_unique) {
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if ($is_unique) {
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throw new Exception(
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pht(
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'Order vector "%s" is invalid: only the last column in an order '.
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'may be unique, but "%s" is a unique column and not the last '.
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'column in the order.',
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$vector->getAsString(),
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$key));
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}
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}
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$this->orderVector = $vector;
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@ -323,7 +419,10 @@ abstract class PhabricatorCursorPagedPolicyAwareQuery
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if (!$this->orderVector) {
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$vector = $this->getDefaultOrderVector();
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$vector = PhabricatorQueryOrderVector::newFromVector($vector);
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$this->orderVector = $vector;
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// We call setOrderVector() here to apply checks to the default vector.
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// This catches any errors in the implementation.
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$this->setOrderVector($vector);
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}
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return $this->orderVector;
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@ -354,6 +453,8 @@ abstract class PhabricatorCursorPagedPolicyAwareQuery
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'table' => null,
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'column' => 'id',
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'reverse' => false,
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'type' => 'int',
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'unique' => true,
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),
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);
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}
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