Better memory and time usage

.gitignore

@@ -8,6 +8,7 @@ node_modules
 # testing
 coverage
 *.sqlite3
+data/
 
 # production
 build/

client/src/App.js

@@ -1,9 +1,13 @@
+import { useState } from 'react';
+
 import './App.css';
 
 function App() {
+    let [content, setContent] = useState("Loading…")
+    fetch('/api/').then(res => res.json()).then(data => setContent(data['message']))
   return (
     <div className="App">
-      Hello world!
+        {content}
     </div>
   );
 }

package.json

@@ -6,6 +6,7 @@
   "scripts": {
     "build": "cd client && npm run build",
     "dev": "nodemon --exec npm start",
+    "import": "node server/cli/import.js",
     "migrate": "npm run migrate:up",
     "migrate:up": "cd server && npx sequelize-cli db:migrate",
     "migrate:undo": "cd server && npx sequelize-cli db:migrate:undo",

server/cli/import.js

@@ -0,0 +1,43 @@
+const fs = require('fs')
+const db = require("../models")
+
+const Airport = db['Airport']
+const Flight = db['Flight']
+
+db.sequelize.sync().then(() => (async () => {
+    // Refresh airport data
+    let airportData = await fs.promises.readFile(`${__dirname}/../data/airports.json`, 'utf-8')
+    airportData = JSON.parse(airportData)
+
+    let icao_codes = []
+    let iata_codes = []
+    let results = await Airport.findAll({attributes: ['icao_code', 'iata_code']})
+    for (let result of results) {
+        if (result.icao_code)
+            icao_codes.push(result.icao_code)
+        if (result.iata_code)
+            iata_codes.push(result.iata_code)
+    }
+    // Import all not-imported airports
+    await Airport.bulkCreate(airportData['response'].filter(airport => !icao_codes.includes(airport.icao_code)
+        && !iata_codes.includes(airport.iata_code)))
+
+    // Import flight routes per departure
+    let airports = await Airport.findAll({attributes: ['icao_code']})
+    for (let airport of airports) {
+        const airportRoutesFile = `${__dirname}/../data/routes/${airport.icao_code}.json`
+        // Ignore unexisting files
+        if (!(await fs.promises.stat(airportRoutesFile).catch(() => false)))
+            continue
+
+        // Read routes
+        let flightsData = await fs.promises.readFile(airportRoutesFile, 'utf-8')
+        flightsData = JSON.parse(flightsData)
+
+        // First remove old routes
+        await Flight.destroy({where: {dep_icao: airport.icao_code}})
+
+        // Then import new routes
+        await Flight.bulkCreate(flightsData['response'])
+    }
+})())

server/index.js

@@ -19,7 +19,7 @@ app.get("/api", (req, res) => {
 })
 
 app.get("/api/airports", (req, res) => {
-  res.json(Airport.findAll())
+  Airport.findAll().then(airports => res.json(airports))
 })
 
 app.get("/api/airport/:id", (req, res) => {