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[mediawiki.git] / includes / api / ApiContinuationManager.php

<?php
/**
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 */

/**
 * This manages continuation state.
 * @since 1.25 this is no longer a subclass of ApiBase
 * @ingroup API
 */
class ApiContinuationManager {
        private $source;

        private $allModules = array();
        private $generatedModules = array();

        private $continuationData = array();
        private $generatorContinuationData = array();

        private $generatorParams = array();
        private $generatorDone = false;

        /**
         * @param ApiBase $module Module starting the continuation
         * @param ApiBase[] $allModules Contains ApiBase instances that will be executed
         * @param array $generatedModules Names of modules that depend on the generator
         * @throws UsageException
         */
        public function __construct(
                ApiBase $module, array $allModules = array(), array $generatedModules = array()
        ) {
                $this->source = get_class( $module );
                $request = $module->getRequest();

                $this->generatedModules = $generatedModules
                        ? array_combine( $generatedModules, $generatedModules )
                        : array();

                $skip = array();
                $continue = $request->getVal( 'continue', '' );
                if ( $continue !== '' ) {
                        $continue = explode( '||', $continue );
                        if ( count( $continue ) !== 2 ) {
                                throw new UsageException(
                                        'Invalid continue param. You should pass the original value returned by the previous query',
                                        'badcontinue'
                                );
                        }
                        $this->generatorDone = ( $continue[0] === '-' );
                        $skip = explode( '|', $continue[1] );
                        if ( !$this->generatorDone ) {
                                $params = explode( '|', $continue[0] );
                                if ( $params ) {
                                        $this->generatorParams = array_intersect_key(
                                                $request->getValues(),
                                                array_flip( $params )
                                        );
                                }
                        } else {
                                // When the generator is complete, don't run any modules that
                                // depend on it.
                                $skip += $this->generatedModules;
                        }
                }

                foreach ( $allModules as $module ) {
                        $name = $module->getModuleName();
                        if ( in_array( $name, $skip, true ) ) {
                                $this->allModules[$name] = false;
                                // Prevent spurious "unused parameter" warnings
                                $module->extractRequestParams();
                        } else {
                                $this->allModules[$name] = $module;
                        }
                }
        }

        /**
         * Get the class that created this manager
         * @return string
         */
        public function getSource() {
                return $this->source;
        }

        /**
         * Is the generator done?
         * @return bool
         */
        public function isGeneratorDone() {
                return $this->generatorDone;
        }

        /**
         * Get the list of modules that should actually be run
         * @return ApiBase[]
         */
        public function getRunModules() {
                return array_values( array_filter( $this->allModules ) );
        }

        /**
         * Set the continuation parameter for a module
         * @param ApiBase $module
         * @param string $paramName
         * @param string|array $paramValue
         * @throws UnexpectedValueException
         */
        public function addContinueParam( ApiBase $module, $paramName, $paramValue ) {
                $name = $module->getModuleName();
                if ( !isset( $this->allModules[$name] ) ) {
                        throw new UnexpectedValueException(
                                "Module '$name' called " . __METHOD__ .
                                        ' but was not passed to ' . __CLASS__ . '::__construct'
                        );
                }
                if ( !$this->allModules[$name] ) {
                        throw new UnexpectedValueException(
                                "Module '$name' was not supposed to have been executed, but " .
                                        'it was executed anyway'
                        );
                }
                $paramName = $module->encodeParamName( $paramName );
                if ( is_array( $paramValue ) ) {
                        $paramValue = join( '|', $paramValue );
                }
                $this->continuationData[$name][$paramName] = $paramValue;
        }

        /**
         * Set the continuation parameter for the generator module
         * @param ApiBase $module
         * @param string $paramName
         * @param string|array $paramValue
         */
        public function addGeneratorContinueParam( ApiBase $module, $paramName, $paramValue ) {
                $name = $module->getModuleName();
                $paramName = $module->encodeParamName( $paramName );
                if ( is_array( $paramValue ) ) {
                        $paramValue = join( '|', $paramValue );
                }
                $this->generatorContinuationData[$name][$paramName] = $paramValue;
        }

        /**
         * Fetch raw continuation data
         * @return array
         */
        public function getRawContinuation() {
                return array_merge_recursive( $this->continuationData, $this->generatorContinuationData );
        }

        /**
         * Fetch continuation result data
         * @return array Array( (array)$data, (bool)$batchcomplete )
         */
        public function getContinuation() {
                $data = array();
                $batchcomplete = false;

                $finishedModules = array_diff(
                        array_keys( $this->allModules ),
                        array_keys( $this->continuationData )
                );

                // First, grab the non-generator-using continuation data
                $continuationData = array_diff_key( $this->continuationData, $this->generatedModules );
                foreach ( $continuationData as $module => $kvp ) {
                        $data += $kvp;
                }

                // Next, handle the generator-using continuation data
                $continuationData = array_intersect_key( $this->continuationData, $this->generatedModules );
                if ( $continuationData ) {
                        // Some modules are unfinished: include those params, and copy
                        // the generator params.
                        foreach ( $continuationData as $module => $kvp ) {
                                $data += $kvp;
                        }
                        $data += $this->generatorParams;
                        $generatorKeys = join( '|', array_keys( $this->generatorParams ) );
                } elseif ( $this->generatorContinuationData ) {
                        // All the generator-using modules are complete, but the
                        // generator isn't. Continue the generator and restart the
                        // generator-using modules
                        $generatorParams = array();
                        foreach ( $this->generatorContinuationData as $kvp ) {
                                $generatorParams += $kvp;
                        }
                        $data += $generatorParams;
                        $finishedModules = array_diff( $finishedModules, $this->generatedModules );
                        $generatorKeys = join( '|', array_keys( $generatorParams ) );
                        $batchcomplete = true;
                } else {
                        // Generator and prop modules are all done. Mark it so.
                        $generatorKeys = '-';
                        $batchcomplete = true;
                }

                // Set 'continue' if any continuation data is set or if the generator
                // still needs to run
                if ( $data || $generatorKeys !== '-' ) {
                        $data['continue'] = $generatorKeys . '||' . join( '|', $finishedModules );
                }

                return array( $data, $batchcomplete );
        }

        /**
         * Store the continuation data into the result
         * @param ApiResult $result
         */
        public function setContinuationIntoResult( ApiResult $result ) {
                list( $data, $batchcomplete ) = $this->getContinuation();
                if ( $data ) {
                        $result->addValue( null, 'continue', $data,
                                ApiResult::ADD_ON_TOP | ApiResult::NO_SIZE_CHECK );
                }
                if ( $batchcomplete ) {
                        $result->addValue( null, 'batchcomplete', true,
                                ApiResult::ADD_ON_TOP | ApiResult::NO_SIZE_CHECK );
                }
        }
}