Initial worker definition. Needs a jobs table to be created

src/Bakery/WorkerListCommand.php

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+<?php
+
+/*
+ * AVSDev UF Worker (https://avsdev.uk)
+ *
+ * @link      https://git.avsdev.uk/avsdev/sprinkle-worker
+ * @license   https://git.avsdev.uk/avsdev/sprinkle-worker/blob/master/LICENSE.md (LGPL-3.0 License)
+ */
+
+namespace UserFrosting\Sprinkle\Worker\Bakery;
+
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+use UserFrosting\System\Bakery\BaseCommand;
+
+/**
+ * worker Bakery Command
+ * List potential jobs.
+ *
+ * @author Craig Williams (https://avsdev.uk)
+ */
+class WorkerListCommand extends BaseCommand
+{
+    /**
+     * {@inheritdoc}
+     */
+    protected function configure()
+    {
+        $this->setName('worker:list')
+             ->setDescription('List all potential jobs')
+             ->setHelp('This command returns a list of potential worker jobs that can be queued to be run by the worker.');
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $this->io->title('Available Jobs List');
+        $jobs = $this->ci->worker->getAvailableJobDefinitions();
+        $this->io->table(['Sprinkle', 'Name', 'Namespace'], $jobs);
+
+        return self::SUCCESS;
+    }
+}

src/Bakery/WorkerRunCommand.php

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+<?php
+
+/*
+ * AVSDev UF Worker (https://avsdev.uk)
+ *
+ * @link      https://git.avsdev.uk/avsdev/sprinkle-worker
+ * @license   https://git.avsdev.uk/avsdev/sprinkle-worker/blob/master/LICENSE.md (LGPL-3.0 License)
+ */
+
+namespace UserFrosting\Sprinkle\Worker\Bakery;
+
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+use UserFrosting\System\Bakery\BaseCommand;
+
+/**
+ * worker:run Bakery Command
+ * Run a worker thread.
+ *
+ * @author Craig Williams (https://avsdev.uk)
+ */
+class WorkerRunCommand extends BaseCommand
+{
+    /**
+     * {@inheritdoc}
+     */
+    protected function configure()
+    {
+        $this->setName('worker:run')
+             ->setDescription('Run a worker loop')
+             ->setHelp('This command runs a the workers job loop. The worker will not return until SIGTERM is sent.');
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $worker = $this->ci->worker;
+
+        $worker->run($this->io);
+
+        return self::SUCCESS;
+    }
+}

src/Jobs/JobBase.php

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+<?php
+
+/*
+ * AVSDev UF Worker (https://avsdev.uk)
+ *
+ * @link      https://git.avsdev.uk/avsdev/sprinkle-worker
+ * @license   https://git.avsdev.uk/avsdev/sprinkle-worker/blob/master/LICENSE.md (LGPL-3.0 License)
+ */
+
+namespace UserFrosting\Sprinkle\Worker\Jobs;
+
+use Psr\Container\ContainerInterface;
+
+/**
+ * Job Base Class
+ *
+ * @author Craig Williams (https://avsdev.uk)
+ */
+abstract class JobBase implements JobInterface
+{
+    /**
+     * @var ContainerInterface
+     */
+    protected $ci;
+
+    /**
+     * Constructor.
+     *
+     * @param ContainerInterface $ci
+     */
+    public function __construct(ContainerInterface $ci)
+    {
+        $this->ci = $ci;
+    }
+}

src/Jobs/JobInterface.php

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+<?php
+
+/*
+ * AVSDev UF Worker (https://avsdev.uk)
+ *
+ * @link      https://git.avsdev.uk/avsdev/sprinkle-worker
+ * @license   https://git.avsdev.uk/avsdev/sprinkle-worker/blob/master/LICENSE.md (LGPL-3.0 License)
+ */
+
+namespace UserFrosting\Sprinkle\Worker\Jobs;
+
+
+/**
+ * All jobs must implement this interface.
+ *
+ * @author Craig Williams (https://avsdev.uk)
+ */
+interface JobInterface
+{
+    /**
+     * Function used to specify what the job does.
+     * 
+     * Add parameters with default values if needed.
+     */
+    public function run();
+
+    /**
+     * Terminate the current job
+     */
+    public function terminate();
+}

src/ServicesProvider/ServicesProvider.php

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+<?php
+
+/*
+ * AVSDev UF Worker (https://avsdev.uk)
+ *
+ * @link      https://git.avsdev.uk/avsdev/sprinkle-worker
+ * @license   https://git.avsdev.uk/avsdev/sprinkle-worker/blob/master/LICENSE.md (LGPL-3.0 License)
+ */
+
+namespace UserFrosting\Sprinkle\Worker\ServicesProvider;
+
+use Illuminate\Container\Container;
+use Psr\Container\ContainerInterface;
+use UserFrosting\Sprinkle\Worker\Worker\Worker;
+use UserFrosting\Sprinkle\Core\ServicesProvider\BaseServicesProvider;
+
+/**
+ * Worker services provider.
+ *
+ * Registers core services for the Worker sprinkle.
+ *
+ * @author Craig Williams (https://avsdev.uk)
+ */
+class ServicesProvider
+{
+    /**
+     * Register Worker's services.
+     *
+     * @param ContainerInterface $container A DI container implementing ArrayAccess and psr-container.
+     */
+    public function register(ContainerInterface $container)
+    {
+        /*
+         * Return an instance of the worker
+         *
+         * @return \UserFrosting\Sprinkle\Worker\Worker\Worker
+         */
+        $container['worker'] = function ($c) {
+            return new Worker($c);
+        };
+    }
+}

src/Worker.php

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+<?php
+
+/*
+ * AVSDev UF Worker (https://avsdev.uk)
+ *
+ * @link      https://git.avsdev.uk/avsdev/sprinkle-worker
+ * @license   https://git.avsdev.uk/avsdev/sprinkle-worker/blob/master/LICENSE.md (LGPL-3.0 License)
+ */
+
+namespace UserFrosting\Sprinkle\Worker;
+
+use UserFrosting\System\Sprinkle\Sprinkle;
+
+/**
+ * Bootstrapper class for the 'worker' sprinkle.
+ *
+ * @author Craig Williams (https://avsdev.uk)
+ */
+class Worker extends Sprinkle
+{
+    /**
+     * Set static references to DI container in necessary classes.
+     */
+    public function onSprinklesInitialized()
+    {
+        $this->registerStreams();
+    }
+
+    /**
+     * Register worker sprinkle locator streams.
+     */
+    protected function registerStreams()
+    {
+        /** @var \UserFrosting\UniformResourceLocator\ResourceLocator $locator */
+        $locator = $this->ci->locator;
+
+        // Register jobs sprinkle class streams
+        $locator->registerStream('jobs', '', \UserFrosting\JOBS_DIR);
+    }
+}

src/Worker/Worker.php

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+<?php
+
+/*
+ * AVSDev UF Worker (https://avsdev.uk)
+ *
+ * @link      https://git.avsdev.uk/avsdev/sprinkle-worker
+ * @license   https://git.avsdev.uk/avsdev/sprinkle-worker/blob/master/LICENSE.md (LGPL-3.0 License)
+ */
+
+namespace UserFrosting\Sprinkle\Worker\Worker;
+
+use Illuminate\Support\Str;
+use Psr\Container\ContainerInterface;
+use UserFrosting\UniformResourceLocator\Resource as ResourceInstance;
+
+/**
+ * Worker Class.
+ *
+ * Finds all job classes across sprinkles
+ *
+ * @author Craig Williams (https://avsdev.uk)
+ */
+class Worker
+{
+    /**
+     * @var ContainerInterface
+     */
+    protected $ci;
+
+    /**
+     * @var string The resource locator scheme
+     */
+    protected $scheme = 'jobs://';
+
+    /**
+     * @var object The currently processing job
+     */
+    protected $currentJob = null;
+
+    /**
+     * Class Constructor.
+     *
+     * @param ContainerInterface $ci
+     */
+    public function __construct(ContainerInterface $ci)
+    {
+        $this->ci = $ci;
+    }
+
+    /**
+     * Loop all the available sprinkles and return a list of their jobs.
+     *
+     * @return array An array of all the task classes found for every sprinkle
+     */
+    public function getAvailableJobDefinitions()
+    {
+        $tasks = $this->ci->locator->listResources($this->scheme, false, false);
+
+        return $this->loadAvailableJobDefinitions($tasks);
+    }
+
+    /**
+     * Process jobs Resource into info.
+     *
+     * @param array $taskFiles List of jobs files
+     *
+     * @return array
+     */
+    protected function loadAvailableJobDefinitions(array $jobFiles)
+    {
+        $jobs = [];
+
+        foreach ($jobFiles as $jobFile) {
+            $job = $this->getJobDefinition($jobFile);
+            if ($job) {
+                $jobs[] = $job;
+            }
+        }
+
+        return $jobs;
+    }
+
+    /**
+     * Return an array of job details including the class name and the sprinkle name.
+     *
+     * @param ResourceInstance $file The job file
+     *
+     * @return array The details about a job file [name, class, sprinkle]
+     */
+    protected function getJobDefinition(ResourceInstance $file)
+    {
+        // Format the sprinkle name for the namespace
+        $sprinkleName = $file->getLocation()->getName();
+        $sprinkleName = Str::studly($sprinkleName);
+
+        // Getting base path, name and class name
+        $basePath = str_replace($file->getBasename(), '', $file->getBasePath());
+        $name = $basePath . $file->getFilename();
+        $className = str_replace('/', '\\', $basePath) . $file->getFilename();
+        $classPath = "\\UserFrosting\\Sprinkle\\$sprinkleName\\Worker\\Jobs\\$className";
+
+        if ($className == "JobInterface" || $className == "JobBase") {
+            return null;
+        }
+
+        // Build the class name and namespace
+        return [
+            'sprinkle' => $sprinkleName,
+            'name'     => $name,
+            'class'    => $classPath,
+        ];
+    }
+
+
+    /**
+     * Runs the worker loop, procssing queued jobs.
+     */
+    public function run($io)
+    {
+        pcntl_async_signals(TRUE);
+
+        pcntl_signal(SIGINT, array($this, "handleTerm"));
+        pcntl_signal(SIGQUIT, array($this, "handleTerm"));
+        pcntl_signal(SIGTERM, array($this, "handleTerm"));
+
+        while(true) {
+            // TODO: find jobs in the database
+
+            try {
+                // Run the job using call_user_func_array
+            } catch(Exception $ex) {
+                $io->error('An exception occurred attempting to run a job');
+                var_dump($ex);
+            } finally {
+                $this->currentJob = null;
+            }
+        }
+    }
+
+    public function handleTerm($signo, $siginfo) {
+        if ($this->currentJob) {
+            $this->currentJob->terminate();
+            $this->currentJob = null;
+        }
+        exit;
+    }
+}