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uptime-kuma/server/model/monitor.js

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const https = require('https');
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const dayjs = require("dayjs");
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const utc = require('dayjs/plugin/utc')
var timezone = require('dayjs/plugin/timezone')
dayjs.extend(utc)
dayjs.extend(timezone)
const axios = require("axios");
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const {Prometheus} = require("../prometheus");
const {debug, UP, DOWN, PENDING} = require("../util");
const {tcping, ping, checkCertificate} = require("../util-server");
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const {R} = require("redbean-node");
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const {BeanModel} = require("redbean-node/dist/bean-model");
const {Notification} = require("../notification")
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// Use Custom agent to disable session reuse
// https://github.com/nodejs/node/issues/3940
const customAgent = new https.Agent({
maxCachedSessions: 0
});
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/**
* status:
* 0 = DOWN
* 1 = UP
*/
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class Monitor extends BeanModel {
async toJSON() {
let notificationIDList = {};
let list = await R.find("monitor_notification", " monitor_id = ? ", [
this.id
])
for (let bean of list) {
notificationIDList[bean.notification_id] = true;
}
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return {
id: this.id,
name: this.name,
url: this.url,
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hostname: this.hostname,
port: this.port,
maxretries: this.maxretries,
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weight: this.weight,
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active: this.active,
type: this.type,
interval: this.interval,
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keyword: this.keyword,
notificationIDList
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};
}
start(io) {
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let previousBeat = null;
let retries = 0;
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let prometheus = new Prometheus(this);
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const beat = async () => {
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if (! previousBeat) {
previousBeat = await R.findOne("heartbeat", " monitor_id = ? ORDER BY time DESC", [
this.id
])
}
const isFirstBeat = !previousBeat;
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let bean = R.dispense("heartbeat")
bean.monitor_id = this.id;
bean.time = R.isoDateTime(dayjs.utc());
bean.status = DOWN;
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// Duration
if (! isFirstBeat) {
bean.duration = dayjs(bean.time).diff(dayjs(previousBeat.time), 'second');
} else {
bean.duration = 0;
}
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try {
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if (this.type === "http" || this.type === "keyword") {
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let startTime = dayjs().valueOf();
let res = await axios.get(this.url, {
headers: { "User-Agent": "Uptime-Kuma" },
httpsAgent: customAgent,
});
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bean.msg = `${res.status} - ${res.statusText}`
bean.ping = dayjs().valueOf() - startTime;
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// Check certificate if https is used
let certInfoStartTime = dayjs().valueOf();
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if (this.getUrl()?.protocol === "https:") {
try {
await this.updateTlsInfo(checkCertificate(res));
} catch (e) {
console.error(e.message)
}
}
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debug("Cert Info Query Time: " + (dayjs().valueOf() - certInfoStartTime) + "ms")
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if (this.type === "http") {
bean.status = UP;
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} else {
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let data = res.data;
// Convert to string for object/array
if (typeof data !== "string") {
data = JSON.stringify(data)
}
if (data.includes(this.keyword)) {
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bean.msg += ", keyword is found"
bean.status = UP;
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} else {
throw new Error(bean.msg + ", but keyword is not found")
}
}
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} else if (this.type === "port") {
bean.ping = await tcping(this.hostname, this.port);
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bean.msg = ""
bean.status = UP;
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} else if (this.type === "ping") {
bean.ping = await ping(this.hostname);
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bean.msg = ""
bean.status = UP;
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}
retries = 0;
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} catch (error) {
if ((this.maxretries > 0) && (retries < this.maxretries)) {
retries++;
bean.status = PENDING;
}
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bean.msg = error.message;
}
// * ? -> ANY STATUS = important [isFirstBeat]
// UP -> PENDING = not important
// * UP -> DOWN = important
// UP -> UP = not important
// PENDING -> PENDING = not important
// * PENDING -> DOWN = important
// PENDING -> UP = not important
// DOWN -> PENDING = this case not exists
// DOWN -> DOWN = not important
// * DOWN -> UP = important
let isImportant = isFirstBeat ||
(previousBeat.status === UP && bean.status === DOWN) ||
(previousBeat.status === DOWN && bean.status === UP) ||
(previousBeat.status === PENDING && bean.status === DOWN);
// Mark as important if status changed, ignore pending pings,
// Don't notify if disrupted changes to up
if (isImportant) {
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bean.important = true;
// Send only if the first beat is DOWN
if (!isFirstBeat || bean.status === DOWN) {
let notificationList = await R.getAll(`SELECT notification.* FROM notification, monitor_notification WHERE monitor_id = ? AND monitor_notification.notification_id = notification.id `, [
this.id
])
let text;
if (bean.status === UP) {
text = "✅ Up"
} else {
text = "🔴 Down"
}
let msg = `[${this.name}] [${text}] ${bean.msg}`;
for(let notification of notificationList) {
try {
await Notification.send(JSON.parse(notification.config), msg, await this.toJSON(), bean.toJSON())
} catch (e) {
console.error("Cannot send notification to " + notification.name)
}
}
}
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} else {
bean.important = false;
}
if (bean.status === UP) {
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console.info(`Monitor #${this.id} '${this.name}': Successful Response: ${bean.ping} ms | Interval: ${this.interval} seconds | Type: ${this.type}`)
} else if (bean.status === PENDING) {
console.warn(`Monitor #${this.id} '${this.name}': Pending: ${bean.msg} | Type: ${this.type}`)
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} else {
console.warn(`Monitor #${this.id} '${this.name}': Failing: ${bean.msg} | Type: ${this.type}`)
}
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prometheus.update(bean)
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io.to(this.user_id).emit("heartbeat", bean.toJSON());
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await R.store(bean)
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Monitor.sendStats(io, this.id, this.user_id)
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previousBeat = bean;
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}
beat();
this.heartbeatInterval = setInterval(beat, this.interval * 1000);
}
stop() {
clearInterval(this.heartbeatInterval)
}
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// Helper Method:
// returns URL object for further usage
// returns null if url is invalid
getUrl() {
try {
return new URL(this.url);
} catch (_) {
return null;
}
}
// Store TLS info to database
async updateTlsInfo(checkCertificateResult) {
let tls_info_bean = await R.findOne("monitor_tls_info", "monitor_id = ?", [
this.id
]);
if (tls_info_bean == null) {
tls_info_bean = R.dispense("monitor_tls_info");
tls_info_bean.monitor_id = this.id;
}
tls_info_bean.info_json = JSON.stringify(checkCertificateResult);
await R.store(tls_info_bean);
}
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static async sendStats(io, monitorID, userID) {
Monitor.sendAvgPing(24, io, monitorID, userID);
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Monitor.sendUptime(24, io, monitorID, userID);
Monitor.sendUptime(24 * 30, io, monitorID, userID);
Monitor.sendCertInfo(io, monitorID, userID);
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}
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/**
*
* @param duration : int Hours
*/
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static async sendAvgPing(duration, io, monitorID, userID) {
let avgPing = parseInt(await R.getCell(`
SELECT AVG(ping)
FROM heartbeat
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WHERE time > DATETIME('now', ? || ' hours')
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AND ping IS NOT NULL
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AND monitor_id = ? `, [
-duration,
monitorID
]));
io.to(userID).emit("avgPing", monitorID, avgPing);
}
static async sendCertInfo(io, monitorID, userID) {
let tls_info = await R.findOne("monitor_tls_info", "monitor_id = ?", [
monitorID
]);
if (tls_info != null) {
io.to(userID).emit("certInfo", monitorID, tls_info.info_json);
}
}
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/**
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* Uptime with calculation
* Calculation based on:
* https://www.uptrends.com/support/kb/reporting/calculation-of-uptime-and-downtime
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* @param duration : int Hours
*/
static async sendUptime(duration, io, monitorID, userID) {
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let sec = duration * 3600;
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let heartbeatList = await R.getAll(`
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SELECT duration, time, status
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FROM heartbeat
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WHERE time > DATETIME('now', ? || ' hours')
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AND monitor_id = ? `, [
-duration,
monitorID
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]);
let downtime = 0;
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let total = 0;
let uptime;
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// Special handle for the first heartbeat only
if (heartbeatList.length === 1) {
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if (heartbeatList[0].status === 1) {
uptime = 1;
} else {
uptime = 0;
}
} else {
for (let row of heartbeatList) {
let value = parseInt(row.duration)
let time = row.time
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// Handle if heartbeat duration longer than the target duration
// e.g. Heartbeat duration = 28hrs, but target duration = 24hrs
if (value > sec) {
let trim = dayjs.utc().diff(dayjs(time), 'second');
value = sec - trim;
if (value < 0) {
value = 0;
}
}
total += value;
if (row.status === 0 || row.status === 2) {
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downtime += value;
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}
}
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uptime = (total - downtime) / total;
if (uptime < 0) {
uptime = 0;
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}
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}
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io.to(userID).emit("uptime", monitorID, duration, uptime);
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}
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}
module.exports = Monitor;