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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 | |
| 21 | /** |
| 22 | * This manages continuation state. |
| 23 | * @since 1.25 this is no longer a subclass of ApiBase |
| 24 | * @ingroup API |
| 25 | */ |
| 26 | class ApiContinuationManager { |
| 27 | /** @var string */ |
| 28 | private $source; |
| 29 | |
| 30 | /** @var (ApiBase|false)[] */ |
| 31 | private $allModules = []; |
| 32 | /** @var string[] */ |
| 33 | private $generatedModules; |
| 34 | |
| 35 | /** @var array[] */ |
| 36 | private $continuationData = []; |
| 37 | /** @var array[] */ |
| 38 | private $generatorContinuationData = []; |
| 39 | /** @var array[] */ |
| 40 | private $generatorNonContinuationData = []; |
| 41 | |
| 42 | /** @var array */ |
| 43 | private $generatorParams = []; |
| 44 | /** @var bool */ |
| 45 | private $generatorDone = false; |
| 46 | |
| 47 | /** |
| 48 | * @param ApiBase $module Module starting the continuation |
| 49 | * @param ApiBase[] $allModules Contains ApiBase instances that will be executed |
| 50 | * @param string[] $generatedModules Names of modules that depend on the generator |
| 51 | * @throws ApiUsageException |
| 52 | */ |
| 53 | public function __construct( |
| 54 | ApiBase $module, array $allModules = [], array $generatedModules = [] |
| 55 | ) { |
| 56 | $this->source = get_class( $module ); |
| 57 | $request = $module->getRequest(); |
| 58 | |
| 59 | $this->generatedModules = $generatedModules |
| 60 | ? array_combine( $generatedModules, $generatedModules ) |
| 61 | : []; |
| 62 | |
| 63 | $skip = []; |
| 64 | $continue = $request->getVal( 'continue', '' ); |
| 65 | if ( $continue !== '' ) { |
| 66 | $continue = explode( '||', $continue ); |
| 67 | if ( count( $continue ) !== 2 ) { |
| 68 | throw ApiUsageException::newWithMessage( $module->getMain(), 'apierror-badcontinue' ); |
| 69 | } |
| 70 | $this->generatorDone = ( $continue[0] === '-' ); |
| 71 | $skip = explode( '|', $continue[1] ); |
| 72 | if ( !$this->generatorDone ) { |
| 73 | $params = explode( '|', $continue[0] ); |
| 74 | $this->generatorParams = array_intersect_key( |
| 75 | $request->getValues(), |
| 76 | array_fill_keys( $params, true ) |
| 77 | ); |
| 78 | } else { |
| 79 | // When the generator is complete, don't run any modules that |
| 80 | // depend on it. |
| 81 | $skip += $this->generatedModules; |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | foreach ( $allModules as $module ) { |
| 86 | $name = $module->getModuleName(); |
| 87 | if ( in_array( $name, $skip, true ) ) { |
| 88 | $this->allModules[$name] = false; |
| 89 | // Prevent spurious "unused parameter" warnings |
| 90 | $module->extractRequestParams(); |
| 91 | } else { |
| 92 | $this->allModules[$name] = $module; |
| 93 | } |
| 94 | } |
| 95 | } |
| 96 | |
| 97 | /** |
| 98 | * Get the class that created this manager |
| 99 | * @return string |
| 100 | */ |
| 101 | public function getSource() { |
| 102 | return $this->source; |
| 103 | } |
| 104 | |
| 105 | /** |
| 106 | * @return bool |
| 107 | */ |
| 108 | public function isGeneratorDone() { |
| 109 | return $this->generatorDone; |
| 110 | } |
| 111 | |
| 112 | /** |
| 113 | * Get the list of modules that should actually be run |
| 114 | * @return ApiBase[] |
| 115 | */ |
| 116 | public function getRunModules() { |
| 117 | return array_values( array_filter( $this->allModules ) ); |
| 118 | } |
| 119 | |
| 120 | /** |
| 121 | * Set the continuation parameter for a module |
| 122 | * @param ApiBase $module |
| 123 | * @param string $paramName |
| 124 | * @param string|array $paramValue |
| 125 | * @throws UnexpectedValueException |
| 126 | */ |
| 127 | public function addContinueParam( ApiBase $module, $paramName, $paramValue ) { |
| 128 | $name = $module->getModuleName(); |
| 129 | if ( !isset( $this->allModules[$name] ) ) { |
| 130 | throw new UnexpectedValueException( |
| 131 | "Module '$name' called " . __METHOD__ . |
| 132 | ' but was not passed to ' . __CLASS__ . '::__construct' |
| 133 | ); |
| 134 | } |
| 135 | if ( !$this->allModules[$name] ) { |
| 136 | throw new UnexpectedValueException( |
| 137 | "Module '$name' was not supposed to have been executed, but " . |
| 138 | 'it was executed anyway' |
| 139 | ); |
| 140 | } |
| 141 | $paramName = $module->encodeParamName( $paramName ); |
| 142 | if ( is_array( $paramValue ) ) { |
| 143 | $paramValue = implode( '|', $paramValue ); |
| 144 | } |
| 145 | $this->continuationData[$name][$paramName] = $paramValue; |
| 146 | } |
| 147 | |
| 148 | /** |
| 149 | * Set the non-continuation parameter for the generator module |
| 150 | * |
| 151 | * In case the generator isn't going to be continued, this sets the fields |
| 152 | * to return. |
| 153 | * |
| 154 | * @since 1.28 |
| 155 | * @param ApiBase $module |
| 156 | * @param string $paramName |
| 157 | * @param string|array $paramValue |
| 158 | */ |
| 159 | public function addGeneratorNonContinueParam( ApiBase $module, $paramName, $paramValue ) { |
| 160 | $name = $module->getModuleName(); |
| 161 | $paramName = $module->encodeParamName( $paramName ); |
| 162 | if ( is_array( $paramValue ) ) { |
| 163 | $paramValue = implode( '|', $paramValue ); |
| 164 | } |
| 165 | $this->generatorNonContinuationData[$name][$paramName] = $paramValue; |
| 166 | } |
| 167 | |
| 168 | /** |
| 169 | * Set the continuation parameter for the generator module |
| 170 | * @param ApiBase $module |
| 171 | * @param string $paramName |
| 172 | * @param int|string|array $paramValue |
| 173 | */ |
| 174 | public function addGeneratorContinueParam( ApiBase $module, $paramName, $paramValue ) { |
| 175 | $name = $module->getModuleName(); |
| 176 | $paramName = $module->encodeParamName( $paramName ); |
| 177 | if ( is_array( $paramValue ) ) { |
| 178 | $paramValue = implode( '|', $paramValue ); |
| 179 | } |
| 180 | $this->generatorContinuationData[$name][$paramName] = $paramValue; |
| 181 | } |
| 182 | |
| 183 | /** |
| 184 | * Fetch raw continuation data |
| 185 | * @return array[] |
| 186 | */ |
| 187 | public function getRawContinuation() { |
| 188 | return array_merge_recursive( $this->continuationData, $this->generatorContinuationData ); |
| 189 | } |
| 190 | |
| 191 | /** |
| 192 | * Fetch raw non-continuation data |
| 193 | * @since 1.28 |
| 194 | * @return array[] |
| 195 | */ |
| 196 | public function getRawNonContinuation() { |
| 197 | return $this->generatorNonContinuationData; |
| 198 | } |
| 199 | |
| 200 | /** |
| 201 | * Fetch continuation result data |
| 202 | * @return array [ (array)$data, (bool)$batchcomplete ] |
| 203 | */ |
| 204 | public function getContinuation() { |
| 205 | $data = []; |
| 206 | $batchcomplete = false; |
| 207 | |
| 208 | $finishedModules = array_diff( |
| 209 | array_keys( $this->allModules ), |
| 210 | array_keys( $this->continuationData ) |
| 211 | ); |
| 212 | |
| 213 | // First, grab the non-generator-using continuation data |
| 214 | $continuationData = array_diff_key( $this->continuationData, $this->generatedModules ); |
| 215 | foreach ( $continuationData as $kvp ) { |
| 216 | $data += $kvp; |
| 217 | } |
| 218 | |
| 219 | // Next, handle the generator-using continuation data |
| 220 | $continuationData = array_intersect_key( $this->continuationData, $this->generatedModules ); |
| 221 | if ( $continuationData ) { |
| 222 | // Some modules are unfinished: include those params, and copy |
| 223 | // the generator params. |
| 224 | foreach ( $continuationData as $kvp ) { |
| 225 | $data += $kvp; |
| 226 | } |
| 227 | $generatorParams = []; |
| 228 | foreach ( $this->generatorNonContinuationData as $kvp ) { |
| 229 | $generatorParams += $kvp; |
| 230 | } |
| 231 | $generatorParams += $this->generatorParams; |
| 232 | // @phan-suppress-next-line PhanTypeInvalidLeftOperand False positive in phan |
| 233 | $data += $generatorParams; |
| 234 | $generatorKeys = implode( '|', array_keys( $generatorParams ) ); |
| 235 | } elseif ( $this->generatorContinuationData ) { |
| 236 | // All the generator-using modules are complete, but the |
| 237 | // generator isn't. Continue the generator and restart the |
| 238 | // generator-using modules |
| 239 | $generatorParams = []; |
| 240 | foreach ( $this->generatorContinuationData as $kvp ) { |
| 241 | $generatorParams += $kvp; |
| 242 | } |
| 243 | $data += $generatorParams; |
| 244 | $finishedModules = array_diff( $finishedModules, $this->generatedModules ); |
| 245 | $generatorKeys = implode( '|', array_keys( $generatorParams ) ); |
| 246 | $batchcomplete = true; |
| 247 | } else { |
| 248 | // Generator and prop modules are all done. Mark it so. |
| 249 | $generatorKeys = '-'; |
| 250 | $batchcomplete = true; |
| 251 | } |
| 252 | |
| 253 | // Set 'continue' if any continuation data is set or if the generator |
| 254 | // still needs to run |
| 255 | if ( $data || $generatorKeys !== '-' ) { |
| 256 | $data['continue'] = $generatorKeys . '||' . implode( '|', $finishedModules ); |
| 257 | } |
| 258 | |
| 259 | return [ $data, $batchcomplete ]; |
| 260 | } |
| 261 | |
| 262 | /** |
| 263 | * Store the continuation data into the result |
| 264 | * @param ApiResult $result |
| 265 | */ |
| 266 | public function setContinuationIntoResult( ApiResult $result ) { |
| 267 | [ $data, $batchcomplete ] = $this->getContinuation(); |
| 268 | if ( $data ) { |
| 269 | $result->addValue( null, 'continue', $data, |
| 270 | ApiResult::ADD_ON_TOP | ApiResult::NO_SIZE_CHECK ); |
| 271 | } |
| 272 | if ( $batchcomplete ) { |
| 273 | $result->addValue( null, 'batchcomplete', true, |
| 274 | ApiResult::ADD_ON_TOP | ApiResult::NO_SIZE_CHECK ); |
| 275 | } |
| 276 | } |
| 277 | } |