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|
<h1>_{MsgOBU}
<section>
<h2>Blub
<strong>Token:</strong> <span id="token">
<section>
<h2>Status
<p id="status">_{MsgNone}
<p id>_{MsgError}: <span id="error">
<section>
<h2>_{MsgLive}
<p><strong>Position: </strong><span id="lat"></span>, <span id="long"></span>
<p><strong>Accuracy: </strong><span id="acc">
<section>
<h2>_{MsgEstimated}
<p><strong>_{MsgDelay}</strong>: <span id="delay">
<p><strong>_{MsgSequence}</strong>: <span id="sequence">
<script>
var token = null;
let euclid = (a,b) => {
let x = a[0]-b[0];
let y = a[1]-b[1];
return x*x+y*y;
}
let minimalDist = (point, list, proj, norm) => {
return list.reduce (
(min, x) => {
let dist = norm(point, proj(x));
return dist < min[0] ? [dist,x] : min
},
[norm(point, proj(list[0])), list[0]]
)[1]
}
let counter = 0;
let ws;
let id;
function setStatus(msg) {
document.getElementById("status").innerText = msg
}
async function geoError(error) {
setStatus("error");
alert(`_{MsgPermissionFailed}: \n${error.message}`);
console.error(error);
main();
}
async function wsError(error) {
// alert(`_{MsgWebsocketError}: \n${error.message === undefined ? error.reason : error.message}`);
console.log(error);
navigator.geolocation.clearWatch(id);
}
async function wsClose(error) {
console.log(error);
document.getElementById("error").innerText = `websocket closed (reason: ${error.reason}). reconnecting …`;
navigator.geolocation.clearWatch(id);
setTimeout(openWebsocket, 1000);
}
function wsMsg(msg) {
let json = JSON.parse(msg.data);
console.log(json);
document.getElementById("delay").innerText =
`${json.delay}s (${Math.floor(json.delay / 60)}min)`;
document.getElementById("sequence").innerText = json.sequence;
}
function initGeopos() {
document.getElementById("error").innerText = "";
id = navigator.geolocation.watchPosition(
geoPing,
geoError,
{enableHighAccuracy: true}
);
}
function openWebsocket () {
ws = new WebSocket((location.protocol == "http:" ? "ws" : "wss") + "://" + location.host + "/api/tracker/ping/ws");
ws.onerror = wsError;
ws.onclose = wsClose;
ws.onmessage = wsMsg;
ws.onopen = (event) => {
setStatus("connected");
};
}
async function geoPing(geoloc) {
console.log("got position update " + counter);
document.getElementById("lat").innerText = geoloc.coords.latitude;
document.getElementById("long").innerText = geoloc.coords.longitude;
document.getElementById("acc").innerText = geoloc.coords.accuracy;
if (ws !== undefined && ws.readyState == 1) {
ws.send(JSON.stringify({
token: token,
geopos: [ geoloc.coords.latitude, geoloc.coords.longitude ],
timestamp: (new Date()).toISOString()
}));
counter += 1;
setStatus(`sent ${counter} pings`);
} else {
setStatus(`websocket readystate ${ws.readyState}`);
}
}
async function main() {
initGeopos();
token = await (await fetch("/api/tracker/register/", {
method: "POST",
body: JSON.stringify({agent: "tracktrain-website"}),
headers: {"Content-Type": "application/json"}
})).json();
if (token.error) {
alert("could not obtain token: \n" + token.msg);
setStatus("_{MsgTokenFailed}");
} else {
console.log("got token");
document.getElementById("token").innerText = token;
openWebsocket();
}
}
main()
|
