Refactor error handling and requests

This commit is contained in:
rui hildt 2020-02-10 00:12:39 +01:00
parent d12f09ed08
commit 86e2a700f8
6 changed files with 199 additions and 45 deletions

81
package-lock.json generated
View File

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@ -1541,6 +1549,11 @@
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@ -7951,6 +7964,11 @@
"object.assign": "^4.1.0"
}
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@ -11296,6 +11314,24 @@
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"requires": {
"lodash": "^4.17.15",
"prop-types": "^15.5.10",
"uuid": "^2.0.1",
"vis-network": "^5.1.1"
},
"dependencies": {
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@ -13586,6 +13622,51 @@
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@ -10,6 +10,7 @@
"axios": "^0.19.2",
"react": "^16.12.0",
"react-dom": "^16.12.0",
"react-graph-vis": "^1.0.5",
"react-router-dom": "^5.1.2",
"react-scripts": "3.3.1",
"react-sigma": "^1.2.34",

View File

@ -7,7 +7,7 @@ function App() {
return (
<Layout>
<h1>Dijkstra</h1>
<p>Dijkstra is an app thas uses Dijkstra algorithm to display the shortest path between different cities in Belgium.</p>
<p>Find the shortest path between different cities in Belgium with Dijkstra algorithm.</p>
<HomeView/>
</Layout>
);

View File

@ -1,66 +1,85 @@
import React, { useState ,useEffect } from "react";
import Axios from '../utils/API';
import { fetchRoads, fetchCities, getShortestPath } from './requests';
import {Sigma, RandomizeNodePositions, RelativeSize, SigmaEnableSVG} from 'react-sigma';
import { Select, Button, Icon } from 'antd';
const { Option } = Select;
function HomeView() {
const [cities, setCities] = useState([]);
const [startingPoint, setStartingPoint] = useState();
const [destination, setDestination] = useState();
const [errorSelect, setError] = useState({ message: '', flag: false });
const [shortestPath, setShortestPath] = useState();
const [errorMessage, setErrorMessage] = useState();
const [cities, setCities] = useState([]);
useEffect(() => {
async function fetchData() {
try {
const { data } = await Axios.get(
`/countries/1`
);
setCities(data);
} catch (error) {
console.error(error);
}
};
fetchData();
fetchCities()
.then(data => setCities(data))
.catch(error => console.log(error))
}, []);
const [roads, setRoads] = useState([]);
useEffect(() => {
fetchRoads()
.then(data => setRoads(data))
.catch(error => console.log(error));
}, []);
const [graph, setGraph] = useState({nodes: [], edges: []});
useEffect(() => {
let nodes = cities.map(node => (
{ id: `n${node.id}`, label: node.name}
));
let edges = roads.map(edge => (
{ id: `e${edge.id}`, source: `n${edge.start_city_id}`, target: `n${edge.end_city_id}`, label: 'SEES' }
))
setGraph({nodes, edges})
}, [cities, roads])
function handleStart(city_id) {
// eslint-disable-next-line
let [ startingPoint ] = cities.filter(city => city.id == city_id);
setStartingPoint(startingPoint);
// Check if start and destination are the same
if (startingPoint === destination) {
setError({ message: 'The start and destination must be different.', flag: true });
return
}
// Will reset the error message and shown path
setShortestPath();
setError({ flag: false });
}
function handleDestination(city_id) {
// eslint-disable-next-line
let [ destination ] = cities.filter(city => city.id == city_id);
setDestination(destination);
// Check if start and destination are the same
if (startingPoint === destination) {
setError({ message: 'The start and destination must be different.', flag: true });
return
}
// Will reset the error message and shown path
setShortestPath();
setError({ flag: false });
}
function handleSubmit() {
if (startingPoint === destination) {
setErrorMessage('Starting Point and Destination must be different cities.');
return
} else if (startingPoint && destination) {
async function getPath() {
try {
const response = await Axios.get(
`/path`,
{
params: {
start_city_id: startingPoint.id,
end_city_id: destination.id
}
}
);
setShortestPath(response.data)
setErrorMessage();
} catch (error) {
console.error(error);
}
}
getPath();
} else
if (startingPoint && destination) {
getShortestPath(startingPoint.id, destination.id)
.then(data => setShortestPath(data))
.catch(error => console.log(error));
setError({ flag: false });
} else {
setErrorMessage('Please select a Starting point and a Destination');
setError({ message: 'Please select a start and a destination', flag: true});
}
}
@ -74,6 +93,7 @@ function HomeView() {
<Select
defaultValue="Choose a city"
onChange={handleStart}
style={{ width: 139 }}
>
{cities.map(city => (
<Option key={city.id}>{city.name}</Option>
@ -89,6 +109,7 @@ function HomeView() {
<Select
defaultValue="Choose a city"
onChange={handleDestination}
style={{ width: 139 }}
>
{cities.map(city => (
<Option key={city.id}>{city.name}</Option>
@ -104,21 +125,32 @@ function HomeView() {
Get shortest path between the cities
<Icon type="right" />
</Button>
{errorMessage &&
<p>{errorMessage}</p>
{errorSelect.flag &&
<p>{errorSelect.message}</p>
}
</section>
{
shortestPath &&
<section>
<h2>Shortest path from {startingPoint.name} to {destination.name}</h2>
<p>{shortestPath.path.map(city => (
<><span>{city.name}</span><Icon type="right" /></>
<h2>Shortest path from {startingPoint.name} to {destination.name} ({shortestPath.distance}km)</h2>
<div>{shortestPath.path.map(city => (
<p key={city.id}><Icon type="right" /><span>{city.name}</span></p>
))}
</p>
</div>
</section>
}
{ graph.nodes.length > 0 &&
<div>
<p>Graph</p>
<Sigma graph={graph} settings={{drawEdges: true, clone: false}} renderer="svg">
<RelativeSize initialSize={50}/>
<RandomizeNodePositions/>
</Sigma>
</div>
}
</main>
);
}

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@ -0,0 +1,40 @@
import Axios from '../utils/API';
export async function fetchRoads() {
try {
const { data } = await Axios.get(
`api/roads`
);
return data
} catch (error) {
console.error(error);
}
};
export async function fetchCities() {
try {
const { data } = await Axios.get(
`api/countries/1`
);
return data
} catch (error) {
console.error(error);
}
};
export async function getShortestPath(startingPointId, destinationID) {
try {
const response = await Axios.get(
`api/path`,
{
params: {
start_city_id: startingPointId,
end_city_id: destinationID
}
}
);
return response.data
} catch (error) {
console.error(error);
}
}

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@ -1,6 +1,6 @@
import axios from "axios";
export default axios.create({
baseURL: "https://dijkstra-backend.herokuapp.com/api",
baseURL: "https://dijkstra-backend.herokuapp.com/",
responseType: "json"
});