Add METAR interface and use local library for decoding

2018-04-02 22:35:25 -05:00
parent 3dba586f83
commit 717118cfb4
16 changed files with 425 additions and 161 deletions
--- a/app/Widgets/Weather.php
+++ b/app/Widgets/Weather.php
@@ -0,0 +1,84 @@
+<?php
+
+namespace App\Widgets;
+
+use App\Interfaces\Widget;
+use App\Support\Http;
+use App\Support\Units\Distance;
+use App\Support\Units\Temperature;
+use Illuminate\Support\Facades\Cache;
+use MetarDecoder\MetarDecoder;
+use SimpleXMLElement;
+
+/**
+ * This is a widget for the 3rd party CheckWX service
+ * @package App\Widgets
+ */
+class Weather extends Widget
+{
+    protected $config = [
+        'icao' => null,
+    ];
+
+    public const URL = 'https://avwx.rest/api/metar/';
+
+    /**
+     * Determine the category depending on the rules for visibility/ceiling
+     * https://www.aviationweather.gov/cva/help
+     * @param $metar
+     * @return string
+     */
+    protected function determineCategory($metar): string
+    {
+        $category = 'VFR';
+        $visibility = $metar->getVisibility()->getVisibility()->getValue();
+        $ceiling = $metar->getClouds();
+        if ($ceiling) {
+            $ceiling = $ceiling[0]->getBaseHeight()->getValue();
+        } else {
+            $ceiling = 1000;
+        }
+
+        if ($visibility < 3 || $ceiling < 1000) {
+            $category = 'IFR';
+        }
+
+        return $category;
+    }
+
+    /**
+     * Attempt to get the data from the CheckWX API
+     */
+    public function run()
+    {
+        // Cache the request so we don't need to repeatedly call out
+        $cache = config('cache.keys.WEATHER_LOOKUP');
+        $key = $cache['key'].$this->config['icao'];
+
+        $raw_metar = Cache::remember($key, $cache['time'], function () {
+            /**
+             * @var \App\Interfaces\Metar $klass
+             */
+            $klass = config('phpvms.metar');
+            $metar_class = new $klass;
+            return $metar_class->get($this->config['icao']);
+        });
+
+        // Run through this parser
+        $decoder = new MetarDecoder();
+        $metar = $decoder->parse($raw_metar);
+
+        // Determine the flight category that's allowed
+        // Just check if we need to be under IFR conditions
+        $category = $this->determineCategory($metar);
+
+        return view('widgets.weather', [
+            'config'    => $this->config,
+            'category'  => $category,
+            'metar'     => $metar,
+            'unit_alt'  => setting('units.altitude'),
+            'unit_dist' => setting('units.distance'),
+            'unit_temp' => setting('units.temperature'),
+        ]);
+    }
+}