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index.html
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<!DOCTYPE html>
<html lang=ru>
<head>
<meta charset="utf-8">
<title>Автобусы на карте</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
<link rel="stylesheet" href="https://unpkg.com/leaflet@1.5.1/dist/leaflet.css" integrity="sha512-xwE/Az9zrjBIphAcBb3F6JVqxf46+CDLwfLMHloNu6KEQCAWi6HcDUbeOfBIptF7tcCzusKFjFw2yuvEpDL9wQ==" crossorigin=""/>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.5.0/css/font-awesome.min.css">
<link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
<link href="https://unpkg.com/beautifymarker@1.0.7/leaflet-beautify-marker-icon.css" rel="stylesheet">
<style type="text/css">
body {
padding: 0;
margin: 0;
}
html, body, #mapid {
height: 100%;
width: 100vw;
}
</style>
</head>
<body>
<div id="mapid"></div>
<script src="https://unpkg.com/leaflet@1.5.1/dist/leaflet.js" integrity="sha512-GffPMF3RvMeYyc1LWMHtK8EbPv0iNZ8/oTtHPx9/cc2ILxQ+u905qIwdpULaqDkyBKgOaB57QTMg7ztg8Jm2Og==" crossorigin=""></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/leaflet-providers/1.9.0/leaflet-providers.min.js" integrity="sha256-DeMZ/oWlg1cLllekEAI8FfVwhvE2Qsuac66qMoo6vzw=" crossorigin="anonymous"></script>
<script src='https://unpkg.com/leaflet.marker.slideto@0.2.0/Leaflet.Marker.SlideTo.js'></script>
<script src="https://unpkg.com/beautifymarker@1.0.7/leaflet-beautify-marker-icon.js"></script>
<script src="https://unpkg.com/leaflet-control-custom@1.0.0/Leaflet.Control.Custom.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/loglevel/1.6.4/loglevel.min.js" integrity="sha256-ACTlnmNCkOooSKkPCKYbiex8WLE82aeiN+Z9ElZag5Q=" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/validate.js/0.13.1/validate.min.js" integrity="sha256-xgP6yiUGsRLSmsC8oW0KrRWiK2ek7cSBznIDMEcdp/U=" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.15/lodash.min.js"></script>
<script type="text/javascript">
const serverUpdateMsgScheme = {
msgType: {presence: true, type: 'string', format: /Buses/},
buses: {presence: true, type: 'array'},
};
const busInfoScheme = {
busId: {presence: true},
lat: {presence: true, type: 'number'},
lng: {presence: true, type: 'number'},
route: {},
};
function validateServerUpdateMsg(jsonData){
const errors = validate(jsonData, serverUpdateMsgScheme);
if (errors){
log.error('Server message format is broken. Check out errors:', errors);
log.info('Following message data was received:', jsonData);
return false;
}
for (let busInfo of jsonData.buses){
const errors = validate(busInfo, busInfoScheme);
if (errors){
log.error('Server message format is broken. Check out bus info errors:', errors);
log.info('Following bus info was received:', busInfo);
return false;
}
}
return true;
}
</script>
<script type="text/javascript">
class WebsocketClosed extends Error {
constructor() {
super('WebsocketClosed');
}
};
async function waitTillSocketOpen(webSocket){
return new Promise((resolve, reject) => {
const onSocketClose = ()=>{
reject(new WebsocketClosed());
webSocket.removeEventListener('open', onWebsocketOpen);
}
const onWebsocketOpen = event => {
resolve();
webSocket.removeEventListener('close', onSocketClose);
}
webSocket.addEventListener('close', onSocketClose);
webSocket.addEventListener('open', onWebsocketOpen);
});
}
async function waitForIncomeMsg(webSocket){
return new Promise((resolve, reject) => {
const onSocketClose = ()=>{
reject(new WebsocketClosed());
webSocket.removeEventListener('message', onMsgReceive);
}
const onMsgReceive = event => {
resolve(event.data);
webSocket.removeEventListener('close', onSocketClose);
}
webSocket.addEventListener('close', onSocketClose);
webSocket.addEventListener('message', onMsgReceive);
});
}
</script>
<script type="text/javascript">
const websocketAddress = localStorage.getItem('websocket') || 'ws://127.0.0.1:8000/ws';
log.info(`Websocket address is ${websocketAddress}`);
const centerOfMoscow = [55.75, 37.6];
var map = L.map('mapid', {
minZoom: 14, // автобусов слишком много, нельзя смотреть всю Москву разом
}).setView(centerOfMoscow, 14);
L.tileLayer.provider('OpenStreetMap.Mapnik').addTo(map);
L.control.custom({
position: 'bottomright',
content: `<input name="address" type="text" value="${websocketAddress}"/>`+
'<button type="button" class="btn btn-info" id="save-btn">Сохранить</button>' +
'<br/>' +
`<label>` +
`<input name="debug" type="checkbox" ${log.getLevel()<=1 && 'checked'}/>` +
'отладка' +
'</label>',
classes: 'btn-group-vertical btn-group-sm',
style: {
padding: '10px',
background: 'rgba(255, 255, 255, 0.7)',
},
events:
{
click: function(event)
{
if (event.target.name == 'debug'){
log.setLevel(event.target.checked && 'debug' || 'warn');
}
if (event.target.id == 'save-btn'){
const newWebsocketAddress = document.getElementsByName("address")[0].value;
localStorage.setItem('websocket', newWebsocketAddress)
document.location.reload();
}
},
}
})
.addTo(map);
const busMarkers = {};
function drawBusMarker(latLng, routeNumber='???', busId='???'){
const icon = L.BeautifyIcon.icon({
isAlphaNumericIcon: true,
text: '' + routeNumber,
iconShape: 'marker',
iconSize: [40, 40],
iconAnchor: [20, 47],
innerIconAnchor: [-5, 7],
borderColor: '#00ABDC',
textColor: '#00ABDC',
});
const marker = L.marker(latLng, { icon: icon })
marker.addTo(map);
marker.bindPopup(`<p>Маршрут №<strong>${routeNumber}</strong>.<br/>Id автобуса ${busId}.</p>`);
return marker;
}
async function sleep(delay){
return new Promise((resolve, reject) => {
setTimeout(resolve, delay);
});
}
function sendBounds(socket, bounds){
const msg = {
'msgType': 'newBounds',
'data': {
'south_lat': bounds._southWest.lat,
'north_lat': bounds._northEast.lat,
'west_lng': bounds._southWest.lng,
'east_lng': bounds._northEast.lng,
},
};
socket.send(JSON.stringify(msg));
log.debug('Send new bounds to the server', msg);
}
function displayBuses(buses){
for (let bus of buses){
const busIdStr = '' + bus.busId;
let marker = busMarkers[busIdStr];
if (!marker){
log.debug(`Place new bus #${busIdStr} on the map. Route ${bus.route}`);
marker = drawBusMarker([bus.lat, bus.lng], bus.route, bus.busId);
busMarkers[busIdStr] = marker;
}
marker.slideTo([bus.lat, bus.lng], {
duration: 500,
});
}
const visibleBusIds = new Set(buses.map(bus => '' + bus.busId));
const drivenAwayBusIds = Object.keys(busMarkers).filter(busId => !visibleBusIds.has(busId));
for (let busId of drivenAwayBusIds){
log.debug(`Bus #${busId} has driven out of the map.`);
busMarkers[busId].remove();
delete busMarkers[busId];
}
}
async function trackBuses(socket){
while (true){
const msgJSON = await waitForIncomeMsg(socket);
try {
var msgData = JSON.parse(msgJSON);
} catch (error) {
log.error(`Expect JSON from server, but receive:`, msgJSON);
continue;
}
if (msgData.msgType == 'Buses'){
if (!validateServerUpdateMsg(msgData)){
return;
}
log.debug('Receive bus positions update from server', msgData);
displayBuses(msgData.buses);
} else {
log.error('Unknown server message received', msgData);
}
}
}
async function listenSocket(){
const socket = new WebSocket(websocketAddress);
await waitTillSocketOpen(socket);
log.info('Websocket connection established');
const sendBoundsToServer = _.debounce(()=>{
const newBounds = map.getBounds();
sendBounds(socket, newBounds);
}, 100)
map.on('zoomend moveend', sendBoundsToServer);
sendBoundsToServer();
try {
await trackBuses(socket);
} finally {
map.off('zoomend moveend', sendBoundsToServer);
}
}
async function listenSocketWithReconnects(){
while (true){
try {
await listenSocket();
} catch (error){
if (error instanceof WebsocketClosed){
log.info('Connection lost. Try to reconnect in 1 sec.')
await sleep(1000);
continue;
}
throw error;
}
}
}
listenSocketWithReconnects();
</script>
</body>
</html>