Add initial version of dijkstra backend cloudron image

api/models/citiesModel.js

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+const db = require('../../data/dbConfig');
+
+module.exports = {
+	getCities,
+    getCitiesByCountry
+    // getCity,
+};
+
+function getCities() {
+	return db('cities')
+}
+
+function getCitiesByCountry(country_id) {
+	return db('cities')
+	.where({ country_id })
+}
+
+// function getCity(name) {
+// 	return db('cities')
+// 		.where({ name })
+// 		.first()
+// }

api/models/countriesModel.js

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+const db = require('../../data/dbConfig');
+
+module.exports = {
+	getCountries,
+	getCountryByName,
+};
+
+function getCountries() {
+	return db('countries')
+}
+
+function getCountryByName(name) {
+	return db('countries')
+		.where({ name })
+		.first()
+}

api/models/roadsModel.js

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+const db = require('../../data/dbConfig');
+
+module.exports = {
+	getRoads
+};
+
+function getRoads() {
+	return db('roads')
+}

api/routes/citiesRouter.js

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+const router = require('express').Router();
+
+const Cities = require('../models/citiesModel');
+
+router.get('', async (req, res) => {
+    try {
+        const cities = await Cities.getCities();
+        res.status(200).json(cities);
+    } catch (e) {
+        res.status(500).json(e);
+    }
+})
+
+module.exports = router;

api/routes/countriesRouter.js

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+const router = require('express').Router();
+const Cities = require('../models/citiesModel');
+
+router.get('/:country_id', async (req, res) => {
+    const { country_id } = req.params;
+    try {
+        const cities = await Cities.getCitiesByCountry(country_id);
+        res.status(200).json(cities);
+    } catch (e) {
+        res.status(500).json(e);
+    }
+})
+
+module.exports = router;

api/routes/pathRouter.js

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+const router = require('express').Router();
+
+const Roads = require('../models/roadsModel');
+const Cities = require('../models/citiesModel');
+
+const findShortestPath = require('../../helpers/dijkstra_algo');
+
+router.get('', async (req, res) => {
+    const { start_city_id, end_city_id } = req.query;
+
+    start = Math.floor(start_city_id);
+    end = Math.floor(end_city_id);
+
+    try {
+        const cities = await Cities.getCities();
+        const roads = await Roads.getRoads();
+
+        let { path, distance } = findShortestPath(cities, roads, start, end);
+        const shortestPath = formatPath(path, cities)
+
+        let response = { path: shortestPath, distance }
+
+        res.status(200).json(response);
+    } catch (e) {
+        res.status(500).json(e);
+    }
+})
+
+function formatPath(path, cities) {
+    const complete_path = []
+
+    for (let path_city of path) {
+        for (let city of cities) {
+            if (city.id == path_city) {
+                complete_path.push({ id: city.id, name: city.name });
+            }
+        }
+    }
+
+    return complete_path
+}
+
+module.exports = router;

api/routes/roadsRouter.js

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+const router = require('express').Router();
+const Roads = require('../models/roadsModel');
+
+router.get('', async (req, res) => {
+    try {
+        const roads = await Roads.getRoads();
+        res.status(200).json(roads);
+    } catch (e) {
+        res.status(500).json(e);
+    }
+})
+
+module.exports = router;

api/server.js

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+const express = require("express");
+const helmet = require('helmet');
+const cors = require('cors');
+
+const citiesRouter = require('./routes/citiesRouter');
+const roadsRouter = require('./routes/roadsRouter');
+const countriesRouter = require('./routes/countriesRouter');
+const pathRouter = require('./routes/pathRouter')
+
+const server = express();
+
+server.use(helmet());
+server.use(express.json());
+server.use(cors());
+
+server.use('/api/cities', citiesRouter);
+server.use('/api/roads', roadsRouter);
+server.use('/api/countries', countriesRouter);
+server.use('/api/path', pathRouter);
+
+module.exports = server;