469 lines
16 KiB
PHP
469 lines
16 KiB
PHP
<?php
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// This file is part of GNU social - https://www.gnu.org/software/social
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//
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// GNU social is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// GNU social is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with GNU social. If not, see <http://www.gnu.org/licenses/>.
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/**
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* Database schema for PostgreSQL
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*
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* @category Database
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* @package GNUsocial
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* @author Evan Prodromou <evan@status.net>
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* @author Brenda Wallace <shiny@cpan.org>
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* @author Brion Vibber <brion@status.net>
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* @copyright 2019 Free Software Foundation, Inc http://www.fsf.org
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* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
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*/
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defined('GNUSOCIAL') || die();
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/**
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* Class representing the database schema for PostgreSQL
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*
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* A class representing the database schema. Can be used to
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* manipulate the schema -- especially for plugins and upgrade
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* utilities.
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*
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* @copyright 2019 Free Software Foundation, Inc http://www.fsf.org
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* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
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*/
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class PgsqlSchema extends Schema
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{
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public static $_single = null;
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/**
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* Main public entry point. Use this to get
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* the singleton object.
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*
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* @param object|null $conn
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* @param string|null dummy param
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* @return Schema the (single) Schema object
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*/
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public static function get($conn = null, $_ = 'pgsql')
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{
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if (empty(self::$_single)) {
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self::$_single = new Schema($conn, 'pgsql');
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}
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return self::$_single;
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}
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/**
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* Returns a table definition array for the table
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* in the schema with the given name.
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*
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* Throws an exception if the table is not found.
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*
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* @param string $table Name of the table to get
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*
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* @return array tabledef for that table.
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* @throws SchemaTableMissingException
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*/
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public function getTableDef($table)
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{
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$def = [];
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$hasKeys = false;
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// Pull column data from INFORMATION_SCHEMA
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$columns = $this->fetchMetaInfo($table, 'columns', 'ordinal_position');
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if (count($columns) == 0) {
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throw new SchemaTableMissingException("No such table: $table");
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}
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// We'll need to match up fields by ordinal reference
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$orderedFields = [];
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foreach ($columns as $row) {
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$name = $row['column_name'];
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$orderedFields[$row['ordinal_position']] = $name;
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$field = [];
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$field['type'] = $type = $row['udt_name'];
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if (in_array($type, ['char', 'bpchar', 'varchar'])) {
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if ($row['character_maximum_length'] !== null) {
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$field['length'] = intval($row['character_maximum_length']);
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}
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}
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if ($type == 'numeric') {
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// Other int types may report these values, but they're irrelevant.
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// Just ignore them!
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if ($row['numeric_precision'] !== null) {
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$field['precision'] = intval($row['numeric_precision']);
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}
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if ($row['numeric_scale'] !== null) {
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$field['scale'] = intval($row['numeric_scale']);
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}
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}
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if ($row['is_nullable'] == 'NO') {
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$field['not null'] = true;
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}
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if ($row['column_default'] !== null) {
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$field['default'] = $row['column_default'];
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if ($this->isNumericType($field)) {
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$field['default'] = (int) $field['default'];
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}
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}
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$def['fields'][$name] = $field;
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}
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// Pulling index info from pg_class & pg_index
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// This can give us primary & unique key info, but not foreign key constraints
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// so we exclude them and pick them up later.
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$indexInfo = $this->fetchIndexInfo($table);
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foreach ($indexInfo as $row) {
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$keyName = $row['key_name'];
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// Dig the column references out!
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//
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// These are inconvenient arrays with partial references to the
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// pg_att table, but since we've already fetched up the column
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// info on the current table, we can look those up locally.
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$cols = [];
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$colPositions = explode(' ', $row['indkey']);
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foreach ($colPositions as $ord) {
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if ($ord == 0) {
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$cols[] = 'FUNCTION'; // @fixme
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} else {
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$cols[] = $orderedFields[$ord];
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}
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}
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$def['indexes'][$keyName] = $cols;
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}
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// Pull constraint data from INFORMATION_SCHEMA:
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// Primary key, unique keys, foreign keys
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$keyColumns = $this->fetchMetaInfo($table, 'key_column_usage', 'constraint_name,ordinal_position');
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$keys = [];
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foreach ($keyColumns as $row) {
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$keyName = $row['constraint_name'];
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$keyCol = $row['column_name'];
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if (!isset($keys[$keyName])) {
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$keys[$keyName] = [];
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}
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$keys[$keyName][] = $keyCol;
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}
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foreach ($keys as $keyName => $cols) {
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// name hack -- is this reliable?
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if ($keyName == "{$table}_pkey") {
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$def['primary key'] = $cols;
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} elseif (preg_match("/^{$table}_(.*)_fkey$/", $keyName, $matches)) {
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$fkey = $this->fetchForeignKeyInfo($table, $keyName);
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$colMap = array_combine($cols, $fkey['col_names']);
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$def['foreign keys'][$keyName] = [$fkey['table_name'], $colMap];
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} else {
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$def['unique keys'][$keyName] = $cols;
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}
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}
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return $def;
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}
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/**
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* Pull some INFORMATION.SCHEMA data for the given table.
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*
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* @param string $table
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* @param $infoTable
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* @param null $orderBy
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* @return array of arrays
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* @throws PEAR_Exception
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*/
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public function fetchMetaInfo($table, $infoTable, $orderBy = null)
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{
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$query = "SELECT * FROM information_schema.%s " .
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"WHERE table_name='%s'";
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$sql = sprintf($query, $infoTable, $table);
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if ($orderBy) {
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$sql .= ' ORDER BY ' . $orderBy;
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}
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return $this->fetchQueryData($sql);
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}
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/**
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* Pull some PG-specific index info
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* @param string $table
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* @return array of arrays
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* @throws PEAR_Exception
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*/
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public function fetchIndexInfo(string $table): array
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{
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$query = 'SELECT indexname AS key_name, indexdef AS key_def, pg_index.* ' .
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'FROM pg_index INNER JOIN pg_indexes ON pg_index.indexrelid = CAST(pg_indexes.indexname AS regclass) ' .
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'WHERE tablename = \'%s\' AND indisprimary = FALSE AND indisunique = FALSE ' .
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'ORDER BY indrelid, indexrelid';
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$sql = sprintf($query, $table);
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return $this->fetchQueryData($sql);
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}
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/**
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* @param string $table
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* @param string $constraint_name
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* @return array array of rows with keys: table_name, col_names (array of strings)
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* @throws PEAR_Exception
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*/
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public function fetchForeignKeyInfo(string $table, string $constraint_name): array
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{
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// In a sane world, it'd be easier to query the column names directly.
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// But it's pretty hard to work with arrays such as col_indexes in direct SQL here.
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$query = 'SELECT ' .
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'(SELECT relname FROM pg_class WHERE oid = confrelid) AS table_name, ' .
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'confrelid AS table_id, ' .
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'(SELECT indkey FROM pg_index WHERE indexrelid = conindid) AS col_indices ' .
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'FROM pg_constraint ' .
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'WHERE conrelid = CAST(\'%s\' AS regclass) AND conname = \'%s\' AND contype = \'f\'';
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$sql = sprintf($query, $table, $constraint_name);
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$data = $this->fetchQueryData($sql);
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if (count($data) < 1) {
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throw new Exception('Could not find foreign key ' . $constraint_name . ' on table ' . $table);
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}
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$row = $data[0];
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return [
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'table_name' => $row['table_name'],
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'col_names' => $this->getTableColumnNames($row['table_id'], $row['col_indices'])
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];
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}
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/**
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*
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* @param int $table_id
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* @param array $col_indexes
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* @return array of strings
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* @throws PEAR_Exception
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*/
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public function getTableColumnNames($table_id, $col_indexes)
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{
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$indexes = array_map('intval', explode(' ', $col_indexes));
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$query = 'SELECT attnum AS col_index, attname AS col_name ' .
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'FROM pg_attribute where attrelid=%d ' .
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'AND attnum IN (%s)';
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$sql = sprintf($query, $table_id, implode(',', $indexes));
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$data = $this->fetchQueryData($sql);
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$byId = [];
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foreach ($data as $row) {
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$byId[$row['col_index']] = $row['col_name'];
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}
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$out = [];
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foreach ($indexes as $id) {
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$out[] = $byId[$id];
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}
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return $out;
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}
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private function isNumericType(array $cd): bool
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{
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$ints = ['int', 'numeric', 'serial'];
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return in_array(strtolower($cd['type']), $ints);
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}
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/**
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* Return the proper SQL for creating or
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* altering a column.
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*
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* Appropriate for use in CREATE TABLE or
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* ALTER TABLE statements.
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*
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* @param string $name column name to create
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* @param array $cd column to create
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*
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* @return string correct SQL for that column
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*/
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public function columnSql(string $name, array $cd)
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{
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$line = [];
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$line[] = parent::columnSql($name, $cd);
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/*
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if ($table['foreign keys'][$name]) {
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foreach ($table['foreign keys'][$name] as $foreignTable => $foreignColumn) {
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$line[] = 'references';
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$line[] = $this->quoteIdentifier($foreignTable);
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$line[] = '(' . $this->quoteIdentifier($foreignColumn) . ')';
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}
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}
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*/
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// This'll have been added from our transform of 'serial' type
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if (!empty($cd['auto_increment'])) {
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$line[] = 'GENERATED BY DEFAULT AS IDENTITY';
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} elseif (!empty($cd['enum'])) {
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foreach ($cd['enum'] as &$val) {
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$vals[] = "'" . $val . "'";
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}
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$line[] = 'CHECK (' . $name . ' IN (' . implode(',', $vals) . '))';
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}
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return implode(' ', $line);
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}
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/**
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* Append phrase(s) to an array of partial ALTER TABLE chunks in order
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* to alter the given column from its old state to a new one.
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*
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* @param array $phrase
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* @param string $columnName
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* @param array $old previous column definition as found in DB
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* @param array $cd current column definition
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*/
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public function appendAlterModifyColumn(array &$phrase, $columnName, array $old, array $cd)
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{
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$prefix = 'ALTER COLUMN ' . $this->quoteIdentifier($columnName) . ' ';
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$oldType = $this->typeAndSize($columnName, $old);
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$newType = $this->typeAndSize($columnName, $cd);
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if ($oldType != $newType) {
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$phrase[] = $prefix . 'TYPE ' . $newType;
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}
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if (!empty($old['not null']) && empty($cd['not null'])) {
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$phrase[] = $prefix . 'DROP NOT NULL';
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} elseif (empty($old['not null']) && !empty($cd['not null'])) {
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$phrase[] = $prefix . 'SET NOT NULL';
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}
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if (isset($old['default']) && !isset($cd['default'])) {
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$phrase[] = $prefix . 'DROP DEFAULT';
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} elseif (!isset($old['default']) && isset($cd['default'])) {
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$phrase[] = $prefix . 'SET DEFAULT ' . $this->quoteDefaultValue($cd);
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}
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}
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public function appendAlterDropPrimary(array &$phrase, string $tableName)
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{
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// name hack -- is this reliable?
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$phrase[] = 'DROP CONSTRAINT ' . $this->quoteIdentifier($tableName . '_pkey');
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}
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/**
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* Append an SQL statement to drop an index from a table.
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* Note that in PostgreSQL, index names are DB-unique.
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*
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* @param array $statements
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* @param string $table
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* @param string $name
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*/
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public function appendDropIndex(array &$statements, $table, $name)
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{
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$statements[] = "DROP INDEX $name";
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}
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public function mapType($column)
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{
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$map = [
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'integer' => 'int',
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'char' => 'bpchar',
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'datetime' => 'timestamp',
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'blob' => 'bytea',
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'enum' => 'text',
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];
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$type = $column['type'];
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if (isset($map[$type])) {
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$type = $map[$type];
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}
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$size = $column['size'] ?? null;
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if ($type === 'int') {
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if (in_array($size, ['tiny', 'small'])) {
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$type = 'int2';
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} elseif ($size === 'big') {
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$type = 'int8';
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} else {
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$type = 'int4';
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}
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} elseif ($type === 'float') {
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$type = ($size !== 'big') ? 'float4' : 'float8';
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}
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return $type;
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}
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/**
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* Filter the given table definition array to match features available
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* in this database.
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*
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* This lets us strip out unsupported things like comments, foreign keys,
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* or type variants that we wouldn't get back from getTableDef().
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*
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* @param string $tableName
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* @param array $tableDef
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* @return array
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*/
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public function filterDef(string $tableName, array $tableDef)
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{
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$tableDef = parent::filterDef($tableName, $tableDef);
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foreach ($tableDef['fields'] as $name => &$col) {
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// No convenient support for field descriptions
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unset($col['description']);
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switch ($col['type']) {
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case 'serial':
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$col['type'] = 'int';
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$col['auto_increment'] = true;
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break;
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case 'timestamp':
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// FIXME: ON UPDATE CURRENT_TIMESTAMP
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if (!array_key_exists('default', $col)) {
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$col['default'] = 'CURRENT_TIMESTAMP';
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}
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// no break
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case 'datetime':
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// Replace archaic MySQL-specific zero dates with NULL
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if (($col['default'] ?? null) === '0000-00-00 00:00:00') {
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$col['default'] = null;
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$col['not null'] = false;
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}
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break;
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}
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$col['type'] = $this->mapType($col);
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unset($col['size']);
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}
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if (!empty($tableDef['primary key'])) {
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$tableDef['primary key'] = $this->filterKeyDef($tableDef['primary key']);
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}
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if (!empty($tableDef['unique keys'])) {
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foreach ($tableDef['unique keys'] as $i => $def) {
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$tableDef['unique keys'][$i] = $this->filterKeyDef($def);
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}
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}
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return $tableDef;
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}
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/**
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* Filter the given key/index definition to match features available
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* in this database.
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*
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* @param array $def
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* @return array
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*/
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public function filterKeyDef(array $def)
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{
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// PostgreSQL doesn't like prefix lengths specified on keys...?
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foreach ($def as $i => $item) {
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if (is_array($item)) {
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$def[$i] = $item[0];
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}
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}
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return $def;
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}
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}
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