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1 | <?php |
2 | /** |
3 | * This program is free software; you can redistribute it and/or modify |
4 | * it under the terms of the GNU General Public License as published by |
5 | * the Free Software Foundation; either version 2 of the License, or |
6 | * (at your option) any later version. |
7 | * |
8 | * This program is distributed in the hope that it will be useful, |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
11 | * GNU General Public License for more details. |
12 | * |
13 | * You should have received a copy of the GNU General Public License along |
14 | * with this program; if not, write to the Free Software Foundation, Inc., |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
16 | * http://www.gnu.org/copyleft/gpl.html |
17 | * |
18 | * @file |
19 | */ |
20 | namespace Wikimedia\Rdbms; |
21 | |
22 | use InvalidArgumentException; |
23 | |
24 | /** |
25 | * Database connection manager. |
26 | * |
27 | * This manages access to primary and replica databases. |
28 | * |
29 | * @since 1.29 |
30 | * @ingroup Database |
31 | * @author Addshore |
32 | */ |
33 | class ConnectionManager { |
34 | |
35 | /** |
36 | * @var ILoadBalancer |
37 | */ |
38 | private $loadBalancer; |
39 | |
40 | /** |
41 | * The symbolic name of the target database, or false for the local wiki's database. |
42 | * |
43 | * @var string|false |
44 | */ |
45 | private $domain; |
46 | |
47 | /** |
48 | * @var string[] |
49 | */ |
50 | private $groups = []; |
51 | |
52 | /** |
53 | * @param ILoadBalancer $loadBalancer |
54 | * @param string|false $domain Optional logical DB name, defaults to current wiki. |
55 | * This follows the convention for database names used by $loadBalancer. |
56 | * @param string[] $groups see LoadBalancer::getConnection |
57 | * |
58 | * @throws InvalidArgumentException |
59 | */ |
60 | public function __construct( ILoadBalancer $loadBalancer, $domain = false, array $groups = [] ) { |
61 | if ( !is_string( $domain ) && $domain !== false ) { |
62 | throw new InvalidArgumentException( '$dbName must be a string, or false.' ); |
63 | } |
64 | |
65 | $this->loadBalancer = $loadBalancer; |
66 | $this->domain = $domain; |
67 | $this->groups = $groups; |
68 | } |
69 | |
70 | /** |
71 | * @param int $i |
72 | * @param string[]|null $groups |
73 | * @param int $flags |
74 | * @return IDatabase |
75 | */ |
76 | private function getConnection( $i, ?array $groups = null, int $flags = 0 ) { |
77 | $groups ??= $this->groups; |
78 | return $this->loadBalancer->getConnection( $i, $groups, $this->domain, $flags ); |
79 | } |
80 | |
81 | /** |
82 | * Returns a connection to the primary DB, for updating. |
83 | * |
84 | * @since 1.29 |
85 | * @since 1.37 Added optional $flags parameter |
86 | * @param int $flags |
87 | * @return IDatabase |
88 | */ |
89 | public function getWriteConnection( int $flags = 0 ) { |
90 | return $this->getConnection( DB_PRIMARY, null, $flags ); |
91 | } |
92 | |
93 | /** |
94 | * Returns a database connection for reading. |
95 | * |
96 | * @since 1.29 |
97 | * @since 1.37 Added optional $flags parameter |
98 | * @param string[]|null $groups |
99 | * @param int $flags |
100 | * @return IReadableDatabase |
101 | */ |
102 | public function getReadConnection( ?array $groups = null, int $flags = 0 ) { |
103 | $groups ??= $this->groups; |
104 | return $this->getConnection( DB_REPLICA, $groups, $flags ); |
105 | } |
106 | } |