EventEspressoBatchRequest\BatchRequestProcessor

Complexity

Total Complexity

16

Size/Duplication

Total Lines	202
Duplicated Lines	16.34 %

Coupling/Cohesion

Components	1
Dependencies	4

Importance

Changes

0

5 Methods

Rating	Name	Duplication	Size	Complexity
B	create_job()	17	36	4
B	continue_job()	8	27	4
B	instantiate_batch_job_handler_from_classname()	0	27	3
B	cleanup_job()	8	27	3
A	_get_error_response()	0	20	2

<?php

namespace EventEspressoBatchRequest;

use EventEspressoBatchRequest\JobHandlerBaseClasses\JobHandlerInterface;
use EventEspressoBatchRequest\Helpers\BatchRequestException;
use EventEspressoBatchRequest\Helpers\JobParameters;
use EventEspressoBatchRequest\Helpers\JobStepResponse;

/**
 * Class BatchRequetProcessor
 * Responsible for receiving a request to start a job and assign it a job Id.
 * Then when subsequent requests come in to continue that job, dispatches
 * the request to the appropriate JobHandler, which processes a step of the batch,
 * and then returns the job's new status.
 * This class is used by controller code, and the controller code is sent HTTP
 * requests from the batch_runner.js library
 *
 * @package               Event Espresso
 * @subpackage            batch
 * @author                Mike Nelson
 * @since                 4.8.26
 */
class BatchRequestProcessor
{
    // phpcs:disable PSR2.Classes.PropertyDeclaration.Underscore
    // phpcs:disable PSR2.Methods.MethodDeclaration.Underscore
    /**
     * Current job's ID (if assigned)
     *
     * @var string|null
     */
    protected $_job_id;

    /**
     * Current job's parameters
     *
     * @var JobParameters|null
     */
    protected $_job_parameters;

    // phpcs:disable PSR1.Methods.CamelCapsMethodName.NotCamelCaps
    /**
     * Creates a job for the specified batch handler class (which should be autoloaded)
     * and the specified request data
     *
     * @param string $batch_job_handler_class of an auto-loaded class implementing JobHandlerInterface
     * @param array  $request_data            to be used by the batch job handler
     * @return JobStepResponse
     */
    public function create_job($batch_job_handler_class, $request_data)
    {
        try {
            $this->_job_id = wp_generate_password(15, false);
            $obj = $this->instantiate_batch_job_handler_from_classname($batch_job_handler_class);
            $this->_job_parameters = new JobParameters($this->_job_id, $batch_job_handler_class, $request_data);
            $response = $obj->create_job($this->_job_parameters);
            if (! $response instanceof JobStepResponse) {
                throw new BatchRequestException(
                    sprintf(
                        __(
                            'The class implementing JobHandlerInterface did not return a JobStepResponse when create_job was called with %1$s. It needs to return one or throw an Exception',
                            'event_espresso'
                        ),
                        wp_json_encode($request_data)
                    )
                );
            }
            $success = $this->_job_parameters->save(true);
            if (! $success) {
                throw new BatchRequestException(
                    sprintf(
                        __(
                            'Could not save job %1$s to the Wordpress Options table. These were the arguments used: %2$s',
                            'event_espresso'
                        ),
                        $this->_job_id,
                        wp_json_encode($request_data)
                    )
                );
            }
        } catch (\Exception $e) {
            $response = $this->_get_error_response($e, 'create_job');
        }
        return $response;
    }


    /**
     * Retrieves the job's arguments
     *
     * @param string $job_id
     * @param int    $batch_size
     * @return JobStepResponse
     */
    public function continue_job($job_id, $batch_size = 50)
    {
        try {
            $this->_job_id = $job_id;
            $batch_size = defined('EE_BATCHRUNNER_BATCH_SIZE') ? EE_BATCHRUNNER_BATCH_SIZE : $batch_size;
            // get the corresponding WordPress option for the job
            $this->_job_parameters = JobParameters::load($this->_job_id);
            $handler_obj = $this->instantiate_batch_job_handler_from_classname($this->_job_parameters->classname());
            // continue it
            $response = $handler_obj->continue_job($this->_job_parameters, $batch_size);
            if (! $response instanceof JobStepResponse) {
                throw new BatchRequestException(
                    sprintf(
                        __(
                            'The class implementing JobHandlerInterface did not return a JobStepResponse when continue_job was called with job %1$s. It needs to return one or throw an Exception',
                            'event_espresso'
                        ),
                        $this->_job_id
                    )
                );
            }
            $this->_job_parameters->save();
        } catch (\Exception $e) {
            $response = $this->_get_error_response($e, 'continue_job');
        }
        return $response;
    }


    /**
     * Instantiates an object of type $classname, which implements
     * JobHandlerInterface
     *
     * @param string $classname
     * @return JobHandlerInterface
     * @throws BatchRequestException
     */
    public function instantiate_batch_job_handler_from_classname($classname)
    {
        if (! class_exists($classname)) {
            throw new BatchRequestException(
                sprintf(
                    __(
                        'The class %1$s does not exist, and so could not be used for running a job. It should implement JobHandlerInterface.',
                        'event_espresso'
                    ),
                    $classname
                )
            );
        }
        $obj = new $classname;
        if (! $obj instanceof JobHandlerInterface) {
            throw new BatchRequestException(
                sprintf(
                    __(
                        'The class %1$s does not implement JobHandlerInterface and so could not be used for running a job',
                        'event_espresso'
                    ),
                    $classname
                )
            );
        }
        return $obj;
    }


    /**
     * Forces a job to be cleaned up
     *
     * @param string $job_id
     * @return JobStepResponse
     * @throws BatchRequestException
     */
    public function cleanup_job($job_id)
    {
        try {
            $this->_job_id = $job_id;
            $job_parameters = JobParameters::load($this->_job_id);
            $handler_obj = $this->instantiate_batch_job_handler_from_classname($job_parameters->classname());
            // continue it
            $response = $handler_obj->cleanup_job($job_parameters);
            if (! $response instanceof JobStepResponse) {
                throw new BatchRequestException(
                    sprintf(
                        __(
                            'The class implementing JobHandlerInterface did not return a JobStepResponse when cleanup_job was called with job %1$s. It needs to return one or throw an Exception',
                            'event_espresso'
                        ),
                        $this->_job_id
                    )
                );
            }
            $job_parameters->set_status(JobParameters::status_cleaned_up);
            $job_parameters->delete();
            return $response;
        } catch (\Exception $e) {
            $response = $this->_get_error_response($e, 'cleanup_job');
        }
        return $response;
    }


    /**
     * Creates a valid JobStepResponse object from an exception and method name.
     *
     * @param \Exception $exception
     * @param string     $method_name
     * @return JobStepResponse
     */
    protected function _get_error_response(\Exception $exception, $method_name)
    {
        if (! $this->_job_parameters instanceof JobParameters) {
            $this->_job_parameters = new JobParameters($this->_job_id, __('__Unknown__', 'event_espresso'), array());
        }
        $this->_job_parameters->set_status(JobParameters::status_error);
        return new JobStepResponse(
            $this->_job_parameters,
            sprintf(
                __(
                    'An exception of type %1$s occurred while running %2$s. Its message was %3$s and had trace %4$s',
                    'event_espresso'
                ),
                get_class($exception),
                'BatchRunner::' . $method_name . '()',
                $exception->getMessage(),
                $exception->getTraceAsString()
            )
        );
    }
}