const dayjs = require("dayjs"); const utc = require('dayjs/plugin/utc') var timezone = require('dayjs/plugin/timezone') dayjs.extend(utc) dayjs.extend(timezone) const axios = require("axios"); const {tcping, ping} = 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 */ 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, weight: this.weight, active: this.active, type: this.type, interval: this.interval, keyword: this.keyword, notificationIDList }; } start(io) { let previousBeat = null; const beat = async () => { console.log(`Monitor ${this.id}: Heartbeat`) if (! previousBeat) { previousBeat = await R.findOne("heartbeat", " monitor_id = ? ORDER BY time DESC", [ this.id ]) } let bean = R.dispense("heartbeat") bean.monitor_id = this.id; bean.time = R.isoDateTime(dayjs.utc()); bean.status = 0; // Duration if (previousBeat) { bean.duration = dayjs(bean.time).diff(dayjs(previousBeat.time), 'second'); } else { bean.duration = 0; } try { if (this.type === "http" || this.type === "keyword") { let startTime = dayjs().valueOf(); let res = await axios.get(this.url) bean.msg = `${res.status} - ${res.statusText}` bean.ping = dayjs().valueOf() - startTime; if (this.type === "http") { bean.status = 1; } else { if (res.data.includes(this.keyword)) { bean.msg += ", keyword is found" bean.status = 1; } else { throw new Error(bean.msg + ", but keyword is not found") } } } else if (this.type === "port") { bean.ping = await tcping(this.hostname, this.port); bean.msg = "" bean.status = 1; } else if (this.type === "ping") { bean.ping = await ping(this.hostname); bean.msg = "" bean.status = 1; } } catch (error) { bean.msg = error.message; } // Mark as important if status changed if (! previousBeat || previousBeat.status !== bean.status) { bean.important = true; // Do not send if first beat is UP if (previousBeat || bean.status !== 1) { let notificationList = await R.getAll(`SELECT notification.* FROM notification, monitor_notification WHERE monitor_id = ? AND monitor_notification.notification_id = notification.id `, [ this.id ]) let promiseList = []; let text; if (bean.status === 1) { text = "✅ Up" } else { text = "🔴 Down" } let msg = `[${this.name}] [${text}] ${bean.msg}`; for(let notification of notificationList) { promiseList.push(Notification.send(JSON.parse(notification.config), msg, await this.toJSON(), bean.toJSON())); } await Promise.all(promiseList); } } else { bean.important = false; } 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) } 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); } /** * * @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); } /** * 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) { downtime += value; } } uptime = (total - downtime) / total; if (uptime < 0) { uptime = 0; } } io.to(userID).emit("uptime", monitorID, duration, uptime); } } module.exports = Monitor;