Create rider tracker service. Create a test command to test rider tracker service. #180

src/Command/TestRiderTrackerCommand.php

@@ -0,0 +1,46 @@
+<?php
+
+namespace App\Command;
+
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+use CrEOF\Spatial\PHP\Types\Geometry\Point;
+
+use App\Service\RiderTracker;
+
+class TestRiderTrackerCommand extends Command
+{
+    protected function configure()
+    {
+        $this->setName('test:ridertracker')
+            ->setDescription('Test the rider tracker service')
+            ->setHelp('Test the rider tracker service.')
+            ->addArgument('rider_id', InputArgument::REQUIRED, 'Rider ID');
+    }
+
+    public function __construct(RiderTracker $rtracker)
+    {
+        $this->rtracker = $rtracker;
+
+        parent::__construct();
+    }
+
+    public function execute(InputInterface $input, OutputInterface $output)
+    {
+        $rider_id = $input->getArgument('rider_id');
+
+        $coordinates = $this->rtracker->getRiderLocation($rider_id); 
+
+        if ($coordinates != null)
+        {
+            echo "Rider Location: " . $coordinates->getLongitude() . "," . $coordinates->getLatitude() . "\n";
+        }
+        else
+        {
+            echo "Invalid rider id." . "\n";
+        }
+    }
+}

src/Service/RiderTracker.php

@@ -0,0 +1,58 @@
+<?php
+
+namespace App\Service;
+
+use App\Entity\Rider;
+
+use Doctrine\ORM\EntityManagerInterface;
+
+use CrEOF\Spatial\PHP\Types\Geometry\Point;
+
+use Predis\Client as PredisClient;
+
+class RiderTracker
+{
+    const RIDER_PREFIX_KEY        = 'rider.location';
+
+    protected $em;
+    protected $redis;
+
+    public function __construct(EntityManagerInterface $em)
+    {
+        $this->em = $em;
+
+        // TODO: make it read redis settings from config
+        //       build a service maybe?
+        $this->redis = new PredisClient();
+    }
+
+    protected function getRiderKey($rider_id)
+    {
+        return self::RIDER_PREFIX_KEY . '.' . $rider_id;
+    }
+
+    public function getRiderLocation($rider_id)
+    {
+        // check if rider id exists or is valid
+        $rider = $this->em->getRepository(Rider::class)->find($rider_id);
+        if ($rider != null)
+        {
+            $coordinates = $rider->getHub()->getCoordinates();
+
+            $key = $this->getRiderKey($rider_id);
+
+            // check redis cache for rider information
+            if (($this->redis->hexists($key, 'longitude')) && 
+                ($this->redis->hexists($key, 'latitude')))
+            {
+                $long = $this->redis->hget($key, 'longitude');
+                $lat = $this->redis->hget($key, 'latitude');
+
+                $coordinates = new Point($long, $lat);
+            }
+
+            return $coordinates;
+
+        }
+    }
+}