const https = require("https"); const dayjs = require("dayjs"); const utc = require("dayjs/plugin/utc") let timezone = require("dayjs/plugin/timezone") dayjs.extend(utc) dayjs.extend(timezone) const axios = require("axios"); const { Prometheus } = require("../prometheus"); const { debug, UP, DOWN, PENDING, flipStatus } = require("../../src/util"); const { tcping, ping, checkCertificate } = require("../util-server"); const { R } = require("redbean-node"); const { BeanModel } = require("redbean-node/dist/bean-model"); const { Notification } = require("../notification") /** * status: * 0 = DOWN * 1 = UP * 2 = PENDING */ 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; } return { id: this.id, name: this.name, url: this.url, hostname: this.hostname, port: this.port, maxretries: this.maxretries, weight: this.weight, active: this.active, type: this.type, interval: this.interval, keyword: this.keyword, ignoreTls: this.getIgnoreTls(), upsideDown: this.isUpsideDown(), notificationIDList, }; } /** * Parse to boolean * @returns {boolean} */ getIgnoreTls() { return Boolean(this.ignoreTls) } /** * Parse to boolean * @returns {boolean} */ isUpsideDown() { return Boolean(this.upsideDown); } start(io) { let previousBeat = null; let retries = 0; let prometheus = new Prometheus(this); const beat = async () => { if (! previousBeat) { previousBeat = await R.findOne("heartbeat", " monitor_id = ? ORDER BY time DESC", [ this.id, ]) } const isFirstBeat = !previousBeat; let bean = R.dispense("heartbeat") bean.monitor_id = this.id; bean.time = R.isoDateTime(dayjs.utc()); bean.status = DOWN; if (this.isUpsideDown()) { bean.status = flipStatus(bean.status); } // Duration if (! isFirstBeat) { bean.duration = dayjs(bean.time).diff(dayjs(previousBeat.time), "second"); } else { bean.duration = 0; } try { if (this.type === "http" || this.type === "keyword") { let startTime = dayjs().valueOf(); // Use Custom agent to disable session reuse // https://github.com/nodejs/node/issues/3940 let res = await axios.get(this.url, { headers: { "User-Agent": "Uptime-Kuma", }, httpsAgent: new https.Agent({ maxCachedSessions: 0, rejectUnauthorized: ! this.getIgnoreTls(), }), }); bean.msg = `${res.status} - ${res.statusText}` bean.ping = dayjs().valueOf() - startTime; // Check certificate if https is used let certInfoStartTime = dayjs().valueOf(); if (this.getUrl()?.protocol === "https:") { try { await this.updateTlsInfo(checkCertificate(res)); } catch (e) { console.error(e.message) } } debug("Cert Info Query Time: " + (dayjs().valueOf() - certInfoStartTime) + "ms") if (this.type === "http") { bean.status = UP; } else { let data = res.data; // Convert to string for object/array if (typeof data !== "string") { data = JSON.stringify(data) } if (data.includes(this.keyword)) { bean.msg += ", keyword is found" bean.status = UP; } else { throw new Error(bean.msg + ", but keyword is not found") } } } else if (this.type === "port") { bean.ping = await tcping(this.hostname, this.port); bean.msg = "" bean.status = UP; } else if (this.type === "ping") { bean.ping = await ping(this.hostname); bean.msg = "" bean.status = UP; } if (this.isUpsideDown()) { bean.status = flipStatus(bean.status); if (bean.status === DOWN) { throw new Error("Flip UP to DOWN"); } } retries = 0; } catch (error) { bean.msg = error.message; // If UP come in here, it must be upside down mode // Just reset the retries if (this.isUpsideDown() && bean.status === UP) { retries = 0; } else if ((this.maxretries > 0) && (retries < this.maxretries)) { retries++; bean.status = PENDING; } } // * ? -> 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) { 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}] ${bean.msg}`; for (let notification of notificationList) { try { await Notification.send(JSON.parse(notification.config), msg, await this.toJSON(), bean.toJSON()) } catch (e) { console.error("Cannot send notification to " + notification.name) } } } } else { bean.important = false; } if (bean.status === UP) { console.info(`Monitor #${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} | Max retries: ${this.maxretries} | Type: ${this.type}`) } else { console.warn(`Monitor #${this.id} '${this.name}': Failing: ${bean.msg} | Type: ${this.type}`) } prometheus.update(bean) io.to(this.user_id).emit("heartbeat", bean.toJSON()); await R.store(bean) Monitor.sendStats(io, this.id, this.user_id) previousBeat = bean; } beat(); this.heartbeatInterval = setInterval(beat, this.interval * 1000); } stop() { clearInterval(this.heartbeatInterval) } /** * Helper Method: * returns URL object for further usage * returns null if url is invalid * @returns {null|URL} */ getUrl() { try { return new URL(this.url); } catch (_) { return null; } } /** * Store TLS info to database * @param checkCertificateResult * @returns {Promise} */ 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); } static async sendStats(io, monitorID, userID) { Monitor.sendAvgPing(24, io, monitorID, userID); Monitor.sendUptime(24, io, monitorID, userID); Monitor.sendUptime(24 * 30, io, monitorID, userID); Monitor.sendCertInfo(io, monitorID, userID); } /** * * @param duration : int Hours */ static async sendAvgPing(duration, io, monitorID, userID) { let avgPing = parseInt(await R.getCell(` SELECT AVG(ping) FROM heartbeat WHERE time > DATETIME('now', ? || ' hours') AND ping IS NOT NULL 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); } } /** * Uptime with calculation * Calculation based on: * https://www.uptrends.com/support/kb/reporting/calculation-of-uptime-and-downtime * @param duration : int Hours */ static async sendUptime(duration, io, monitorID, userID) { let sec = duration * 3600; let heartbeatList = await R.getAll(` SELECT duration, time, status FROM heartbeat WHERE time > DATETIME('now', ? || ' hours') AND monitor_id = ? `, [ -duration, monitorID, ]); let downtime = 0; let total = 0; let uptime; // Special handle for the first heartbeat only if (heartbeatList.length === 1) { 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 // 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) { downtime += value; } } uptime = (total - downtime) / total; if (uptime < 0) { uptime = 0; } } io.to(userID).emit("uptime", monitorID, duration, uptime); } } module.exports = Monitor;