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TtmServerFactory
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4.32
1<?php
2declare( strict_types = 1 );
3
4namespace MediaWiki\Extension\Translate\TtmServer;
5
6use InvalidArgumentException;
7
8/**
9 * @since 2021.01
10 * @license GPL-2.0-or-later
11 * @author Niklas Laxström
12 */
13class TtmServerFactory {
14    private array $configs;
15    private ?string $default;
16    private const TTMSERVER_CLASSES = [
17        ReadableTtmServer::class,
18        WritableTtmServer::class,
19        SearchableTtmServer::class
20    ];
21
22    /** @see https://www.mediawiki.org/wiki/Help:Extension:Translate/Translation_memories#Configuration */
23    public function __construct( array $configs, ?string $default = null ) {
24        $this->configs = $configs;
25        $this->default = $default;
26    }
27
28    /** @return string[] */
29    public function getNames(): array {
30        $ttmServersIds = [];
31        foreach ( $this->configs as $serviceId => $config ) {
32            $type = $config['type'] ?? '';
33            if ( $type === 'ttmserver' || $type === 'remote-ttmserver' ) {
34                $ttmServersIds[] = $serviceId;
35            }
36
37            // Translation memory configuration may not define a type, in such
38            // cases we determine whether the service is a TTM server using the
39            // interfaces it implements.
40            $serviceClass = $config['class'] ?? null;
41            if ( $serviceClass !== null ) {
42                foreach ( self::TTMSERVER_CLASSES as $ttmClass ) {
43                    if ( $serviceClass instanceof $ttmClass ) {
44                        $ttmServersIds[] = $serviceId;
45                        break;
46                    }
47                }
48            }
49        }
50        return $ttmServersIds;
51    }
52
53    public function has( string $name ): bool {
54        $ttmServersIds = $this->getNames();
55        return in_array( $name, $ttmServersIds );
56    }
57
58    public function create( string $name ): TtmServer {
59        if ( !$this->has( $name ) ) {
60            throw new ServiceCreationFailure( "No configuration for name '$name'" );
61        }
62
63        $config = $this->configs[$name];
64        if ( !is_array( $config ) ) {
65            throw new ServiceCreationFailure( "Invalid configuration for name '$name'" );
66        }
67
68        if ( isset( $config['class'] ) ) {
69            $class = $config['class'];
70
71            // TODO: Add a factory to create TTM server instances
72            if ( in_array( $class, [ DatabaseTtmServer::class, 'DatabaseTTMServer', 'DatabaseTtmServer' ] ) ) {
73                return new DatabaseTtmServer( $config );
74            }
75
76            return new $class( $config );
77        } elseif ( isset( $config['type'] ) ) {
78            $type = $config['type'];
79            switch ( $type ) {
80                case 'ttmserver':
81                    return new DatabaseTtmServer( $config );
82                case 'remote-ttmserver':
83                    return new RemoteTTMServer( $config );
84                default:
85                    throw new ServiceCreationFailure( "Unknown type for name '$name': $type" );
86            }
87        }
88
89        throw new ServiceCreationFailure( "Invalid configuration for name '$name': type not specified" );
90    }
91
92    public function getDefaultForQuerying(): ReadableTtmServer {
93        if ( $this->default === null ) {
94            return new FakeTtmServer();
95        }
96
97        if ( $this->configs[ $this->default ][ 'writable' ] ?? false ) {
98            throw new InvalidArgumentException(
99                "Default TTM service {$this->default} cannot be write only"
100            );
101        }
102
103        $service = $this->create( $this->default );
104
105        if ( $service instanceof ReadableTtmServer ) {
106            return $service;
107        }
108
109        throw new InvalidArgumentException(
110            "Default TTM service {$this->default} must implement ReadableTtmServer."
111        );
112    }
113
114    /**
115     * Returns writable servers if configured, else returns the default TtmServer else returns null.
116     * @return array [ serverId => WritableTtmServer ]
117     */
118    public function getWritable(): array {
119        $writableServers = $readOnlyServers = [];
120        $ttmServerIds = $this->getNames();
121
122        foreach ( $ttmServerIds as $serverId ) {
123            $isWritable = $this->configs[ $serverId ][ 'writable' ] ?? null;
124
125            if ( $isWritable ) {
126                if ( $serverId === $this->default ) {
127                    throw new InvalidArgumentException(
128                        "Default TTM server {$this->default} cannot be write only"
129                    );
130                }
131
132                $server = $this->create( $serverId );
133                if ( !$server instanceof WritableTtmServer ) {
134                    throw new InvalidArgumentException(
135                        "Server '$serverId' marked writable does not implement WritableTtmServer interface"
136                    );
137                }
138                $writableServers[ $serverId ] = $server;
139            } elseif ( $isWritable === false ) {
140                $readOnlyServers[] = $serverId;
141            }
142        }
143
144        if ( $writableServers ) {
145            return $writableServers;
146        }
147
148        // If there are no writable server, check and use the default server
149        if ( $this->default ) {
150            $defaultTtmServer = $this->create( $this->default );
151
152            if ( $defaultTtmServer instanceof WritableTtmServer ) {
153                if ( !in_array( $this->default, $readOnlyServers ) ) {
154                    $writableServers[ $this->default ] = $defaultTtmServer;
155                }
156            }
157
158            if ( $writableServers ) {
159                return $writableServers;
160            }
161        }
162
163        // Did not find any writable servers.
164        return [];
165    }
166
167    /** Get servers marked as writable */
168    public function getWriteOnly(): array {
169        $ttmServerIds = $this->getNames();
170        $writableServers = [];
171        foreach ( $ttmServerIds as $serverId ) {
172            if ( $this->configs[ $serverId ][ 'writable' ] ?? false ) {
173                $server = $this->create( $serverId );
174                if ( !$server instanceof WritableTtmServer ) {
175                    throw new \InvalidArgumentException(
176                        "Server '$serverId' marked writable does not implement WritableTtmServer interface"
177                    );
178                }
179                $writableServers[ $serverId ] = $server;
180            }
181        }
182
183        return $writableServers;
184    }
185}