Version 1.0.0 Inital Commit

index.js

@@ -0,0 +1,79 @@
+import RSS from "rss";
+import axios from "axios";
+import fs from 'fs';
+
+const API_URL = "https://aviationweather.gov/api/data/";
+const METAR_SERVICE = "metar";
+const feedOutput = process.env.METAR_FEED_OUTPUT;
+const icao = process.env.METAR_ICAO;
+const rssMetarOptions = {
+    title: icao + " METAR",
+    description: "METAR feed for " + icao + " Airport",
+    feed_url: process.env.METAR_FEED_URL,
+    site_url: process.env.METAR_SITE_URL,
+    generator: "https://git.entropic.pro/Aiden/metar-rss"
+}
+const checkInterval = 10 * 1000 * 60; //10 Minute Check Interval
+
+
+let lastMetar;
+let metarRSS = new RSS(rssMetarOptions);
+
+checkMetar(); //Inital check run
+const metarCheckJob = setInterval(checkMetar, checkInterval); //Run the check every interval
+
+/**
+ * Pulls the current metar and adds it to the feed if it is new
+ */
+function checkMetar() {
+    console.log("Checking METAR for " + icao);
+    getMetar().then(res => {
+        if (res.data != lastMetar) {
+            console.log("New METAR: " + res.data);
+            newMetar(metarRSS, res.data);
+            writeFeed(metarRSS);
+            lastMetar = res.data;
+        }
+    });
+}
+
+/**
+ * Adds a new METAR to the given RSS Feed
+ * @param {*} rss - RSS Feed to add the entry to
+ * @param {*} metar - metar data to add
+ */
+function newMetar(rss, metar)  {
+    let metarSplit = metar.split(" ");
+    let date = new Date(Date.now());
+    let eventDate = new Date(Date.UTC(date.getFullYear(), date.getMonth(), Number(metarSplit[2].substring(0,2)), Number(metarSplit[2].substring(2,4)), Number(metarSplit[2].substring(4,6))));
+
+    rss.item({
+        title: metarSplit[0] + " " + metarSplit[1] + " " + metarSplit[2],
+        description: metar,
+        url: API_URL + METAR_SERVICE,
+        guid: metarSplit[1] + metarSplit[2],
+        date: eventDate
+    });
+}
+
+/**
+ * Pulls METAR data from the API
+ * @returns Axios generated GET Request Response
+ */
+function getMetar() {
+    let requestURL = API_URL + METAR_SERVICE + "?ids=" + icao;
+    return axios.get(requestURL);
+}
+
+/**
+ * Writes the given RSS feed to the specified file
+ * @param {*} rss - RSS Feed to Write
+ */
+function writeFeed(rss) {
+    let xmlFeed = rss.xml({indent: true})
+    try {
+        fs.writeFileSync(feedOutput, xmlFeed);
+    } catch(err) {
+        console.error(err);
+    }
+}