forked from GNUsocial/gnu-social
a38c608420
On PostgreSQL:
- Parse defaults for strings and booleans properly.
- Parse the "serial" definition type properly.
- Get information on the "enum" definition type.
- Re-work getting information about keys/indices.
On MariaDB:
- Get information about lengths in indices.
- Get foreign key information separately from the rest as they can have
colliding names.
469 lines
15 KiB
PHP
469 lines
15 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: $table");
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}
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// Get information on the emulated "enum" type
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$enum_info = $this->fetchEnumInfo($table);
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foreach ($columns as $row) {
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$name = $row['column_name'];
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$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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$col_default = $row['column_default'];
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if (!is_null($col_default)) {
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if ($this->isNumericType($field)) {
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$field['default'] = (int) $col_default;
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} elseif ($type === 'bool') {
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$field['default'] = ($col_default === 'true') ? true : false;
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} else {
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$match = "/^'(.*)'(::.+)*$/";
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if (preg_match($match, $col_default)) {
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$field['default'] = preg_replace(
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$match,
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'\1',
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$col_default
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);
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} else {
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$field['default'] = $col_default;
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}
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}
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}
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if (
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$row['is_identity'] === 'YES'
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&& $row['identity_generation'] = 'BY DEFAULT'
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) {
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$field['auto_increment'] = true;
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} elseif (array_key_exists($name, $enum_info)) {
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$field['type'] = $type = 'enum';
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$field['enum'] = $enum_info[$name];
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}
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$def['fields'][$name] = $field;
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}
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$key_info = $this->fetchKeyInfo($table);
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foreach ($key_info as $row) {
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$key_name = $row['key_name'];
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$cols = $row['cols'];
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switch ($row['key_type']) {
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case 'primary':
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$def['primary key'] = $cols;
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break;
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case 'unique':
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$def['unique keys'][$key_name] = $cols;
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break;
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default:
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$def['indexes'][$key_name] = $cols;
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}
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}
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$foreign_key_info = $this->fetchForeignKeyInfo($table);
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foreach ($foreign_key_info as $row) {
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$key_name = $row['key_name'];
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$cols = $row['cols'];
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$ref_table = $row['ref_table'];
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$def['foreign keys'][$key_name] = [$ref_table, $cols];
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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, $orderBy = null)
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{
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$catalog = $this->conn->dsn['database'];
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return $this->fetchQueryData(sprintf(
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<<<'END'
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SELECT * FROM information_schema.%1$s
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WHERE table_catalog = '%2$s' AND table_name = '%3$s'%4$s;
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END,
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$this->quoteIdentifier($infoTable),
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$catalog,
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$table,
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($orderBy ? " ORDER BY {$orderBy}" : '')
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));
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}
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/**
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* Pull index and keys information for the given table.
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*
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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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private function fetchKeyInfo(string $table): array
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{
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$data = $this->fetchQueryData(sprintf(
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<<<'EOT'
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SELECT "rel"."relname" AS "key_name",
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CASE
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WHEN "idx"."indisprimary" IS TRUE THEN 'primary'
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WHEN "idx"."indisunique" IS TRUE THEN 'unique'
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ELSE "am"."amname"
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END AS "key_type",
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"cols"."attname" AS "col"
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FROM pg_index AS "idx"
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CROSS JOIN LATERAL unnest("idx"."indkey")
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WITH ORDINALITY AS "col_nums" ("num", "pos")
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INNER JOIN pg_class AS "rel"
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ON "idx"."indexrelid" = "rel".oid
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LEFT JOIN pg_attribute AS "cols"
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ON "idx"."indrelid" = "cols"."attrelid"
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AND "col_nums"."num" = "cols"."attnum"
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LEFT JOIN pg_am AS "am"
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ON "rel"."relam" = "am".oid
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WHERE "idx"."indrelid" = CAST('%s' AS REGCLASS)
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ORDER BY "key_type", "key_name", "col_nums"."pos";
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EOT,
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$table
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));
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$rows = [];
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foreach ($data as $row) {
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$name = $row['key_name'];
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if (!array_key_exists($name, $rows)) {
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$row['cols'] = [$row['col']];
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unset($row['col']);
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$rows[$name] = $row;
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} else {
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$rows[$name]['cols'][] = $row['col'];
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}
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}
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return array_values($rows);
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}
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/**
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* Pull foreign key information for the given table.
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*
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* @param string $table
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* @return array array of arrays
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* @throws PEAR_Exception
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*/
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private function fetchForeignKeyInfo(string $table): array
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{
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$data = $this->fetchQueryData(sprintf(
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<<<'END'
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SELECT "con"."conname" AS "key_name",
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"cols"."attname" AS "col",
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"ref_rel"."relname" AS "ref_table",
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"ref_cols"."attname" AS "ref_col"
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FROM pg_constraint AS "con"
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CROSS JOIN LATERAL unnest("con"."conkey", "con"."confkey")
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WITH ORDINALITY AS "col_nums" ("num", "ref_num", "pos")
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LEFT JOIN pg_attribute AS "cols"
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ON "con"."conrelid" = "cols"."attrelid"
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AND "col_nums"."num" = "cols"."attnum"
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LEFT JOIN pg_class AS "ref_rel"
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ON "con"."confrelid" = "ref_rel".oid
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LEFT JOIN pg_attribute AS "ref_cols"
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ON "con"."confrelid" = "ref_cols"."attrelid"
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AND "col_nums"."ref_num" = "ref_cols"."attnum"
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WHERE "con"."contype" = 'f'
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AND "con"."conrelid" = CAST('%s' AS REGCLASS)
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ORDER BY "key_name", "col_nums"."pos";
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END,
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$table
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));
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$rows = [];
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foreach ($data as $row) {
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$name = $row['key_name'];
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if (!array_key_exists($name, $rows)) {
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$row['cols'] = [$row['col'] => $row['ref_col']];
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unset($row['col']);
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unset($row['ref_col']);
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$rows[$name] = $row;
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} else {
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$rows[$name]['cols'][$row['col']] = $row['ref_col'];
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}
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}
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return array_values($rows);
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}
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/**
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* Pull information about the emulated enum columns
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*
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* @param string $table
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* @return array of arrays
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* @throws PEAR_Exception
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*/
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private function fetchEnumInfo($table)
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{
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$data = $this->fetchQueryData(
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<<<END
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SELECT "cols"."attname" AS "col", "con"."consrc" AS "check"
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FROM pg_constraint AS "con"
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INNER JOIN pg_attribute AS "cols"
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ON "con"."conrelid" = "cols"."attrelid"
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AND "con"."conkey"[1] = "cols"."attnum"
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WHERE "cols".atttypid = CAST('text' AS REGTYPE)
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AND "con"."contype" = 'c'
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AND cardinality("con"."conkey") = 1
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AND "con"."conrelid" = CAST('{$table}' AS REGCLASS);
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END
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);
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$rows = [];
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foreach ($data as $row) {
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// PostgreSQL can show either
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$name_regex = '(' . preg_quote($this->quoteIdentifier($row['col']))
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. '|' . preg_quote($row['col']) . ')';
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$enum = explode("'::text, '", preg_replace(
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"/^\({$name_regex} = ANY \(ARRAY\['(.+)'::text]\)\)$/D",
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'\2',
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$row['check']
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));
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$rows[$row['col']] = $enum;
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}
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return $rows;
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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, $cd);
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// This'll have been added from our transform of 'serial' type
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if (!empty($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(' ', $line);
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}
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public function appendAlterDropPrimary(array &$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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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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];
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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($col['description']);
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// @fixme Nor for MariaDB-specific collations
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unset($col['collate']);
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if ($col['type'] === 'serial') {
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$col['type'] = 'int';
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$col['auto_increment'] = true;
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}
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$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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