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import { getURLAndInit } from '../misc/request-helper';
const endpoint = '/traffic';
const textDecoder = new TextDecoder('utf-8');
const Size = 150;
const traffic = {
labels: Array(Size),
// labels: [],
up: Array(Size),
down: Array(Size),
size: Size,
subscribers: [],
appendData(o) {
this.up.push(o.up);
this.down.push(o.down);
const t = new Date();
const l = '' + t.getMinutes() + t.getSeconds();
this.labels.push(l);
if (this.up.length > this.size) this.up.shift();
if (this.down.length > this.size) this.down.shift();
if (this.labels.length > this.size) this.labels.shift();
this.subscribers.forEach((f) => f(o));
},
subscribe(listener) {
this.subscribers.push(listener);
return () => {
const idx = this.subscribers.indexOf(listener);
this.subscribers.splice(idx, 1);
};
},
};
let fetched = false;
let decoded = '';
function parseAndAppend(x) {
traffic.appendData(JSON.parse(x));
}
function pump(reader) {
return reader.read().then(({ done, value }) => {
const str = textDecoder.decode(value, { stream: !done });
decoded += str;
const splits = decoded.split('\n');
const lastSplit = splits[splits.length - 1];
for (let i = 0; i < splits.length - 1; i++) {
parseAndAppend(splits[i]);
}
if (done) {
parseAndAppend(lastSplit);
decoded = '';
// eslint-disable-next-line no-console
console.log('GET /traffic streaming done');
fetched = false;
return;
} else {
decoded = lastSplit;
}
return pump(reader);
});
}
function getWsUrl(apiConfig) {
const { hostname, port, secret } = apiConfig;
let qs = '';
if (typeof secret === 'string' && secret !== '') {
qs += '?token=' + secret;
}
return `ws://${hostname}:${port}${endpoint}${qs}`;
}
// 1 OPEN
// other value CLOSED
// similar to ws readyState but not the same
// https://developer.mozilla.org/en-US/docs/Web/API/WebSocket/readyState
let wsState;
function fetchData(apiConfig) {
if (fetched || wsState === 1) return traffic;
wsState = 1;
const url = getWsUrl(apiConfig);
const ws = new WebSocket(url);
ws.addEventListener('error', function (_ev) {
wsState = 3;
});
ws.addEventListener('close', function (_ev) {
wsState = 3;
fetchDataWithFetch(apiConfig);
});
ws.addEventListener('message', function (event) {
parseAndAppend(event.data);
});
return traffic;
}
function fetchDataWithFetch(apiConfig) {
if (fetched) return traffic;
fetched = true;
const { url, init } = getURLAndInit(apiConfig);
fetch(url + endpoint, init).then(
(response) => {
if (response.ok) {
const reader = response.body.getReader();
pump(reader);
} else {
fetched = false;
}
},
(err) => {
// eslint-disable-next-line no-console
console.log('fetch /traffic error', err);
fetched = false;
}
);
return traffic;
}
export { fetchData };
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