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import { getURLAndInit } from '../misc/request-helper';
const endpoint = '/logs';
const textDecoder = new TextDecoder('utf-8');
const getRandomStr = () => {
return Math.floor((1 + Math.random()) * 0x10000).toString(16);
};
let even = false;
let fetched = false;
let decoded = '';
function appendData(s, callback) {
let o;
try {
o = JSON.parse(s);
} catch (err) {
// eslint-disable-next-line no-console
console.log('JSON.parse error', JSON.parse(s));
}
const now = new Date();
const time = now.toLocaleString('zh-Hans');
// mutate input param in place intentionally
o.time = time;
o.id = now - 0 + getRandomStr();
o.even = even = !even;
callback(o);
}
function pump(reader, appendLog) {
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++) {
appendData(splits[i], appendLog);
}
if (done) {
appendData(lastSplit, appendLog);
decoded = '';
// eslint-disable-next-line no-console
console.log('GET /logs streaming done');
fetched = false;
return;
} else {
decoded = lastSplit;
}
return pump(reader, appendLog);
});
}
const apiConfigSnapshot = {};
let controller;
function getWsUrl(apiConfig) {
const { hostname, port, secret, logLevel } = apiConfig;
let qs = '?level=' + logLevel;
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 fetchLogs(apiConfig, appendLog) {
if (fetched || wsState === 1) return;
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;
fetchLogsWithFetch(apiConfig, appendLog);
});
ws.addEventListener('message', function(event) {
appendData(event.data, appendLog);
});
}
function fetchLogsWithFetch(apiConfig, appendLog) {
if (
controller &&
(apiConfigSnapshot.hostname !== apiConfig.hostname ||
apiConfigSnapshot.port !== apiConfig.port ||
apiConfigSnapshot.secret !== apiConfig.secret ||
apiConfigSnapshot.logLevel !== apiConfig.logLevel)
) {
controller.abort();
} else if (fetched) {
return;
}
fetched = true;
apiConfigSnapshot.hostname = apiConfig.hostname;
apiConfigSnapshot.port = apiConfig.port;
apiConfigSnapshot.secret = apiConfig.secret;
apiConfigSnapshot.logLevel = apiConfig.logLevel;
controller = new AbortController();
const signal = controller.signal;
const { url, init } = getURLAndInit(apiConfig);
fetch(url + endpoint + '?level=' + apiConfig.logLevel, {
...init,
signal
}).then(
response => {
const reader = response.body.getReader();
pump(reader, appendLog);
},
err => {
fetched = false;
if (signal.aborted) return;
// eslint-disable-next-line no-console
console.log('GET /logs error:', err.message);
}
);
}
export { fetchLogs };
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