Feat: code refactoring and jest tests

chore: More refactoring chore: More tests and refactors fix: Fixed age not getting calculated properly chore: Implemented mocking in jest chore: More mock tests chore: checkStuckScreen tests
2020-11-23 16:08:12 +00:00 · 2020-11-23 16:08:12 +00:00 · 04fd82454d
commit 04fd82454d
parent 65165b943b
12 changed files with 1047 additions and 66 deletions
--- a/lib/notifier/codes.js
+++ b/lib/notifier/codes.js
@ -0,0 +1,34 @@
+const T = require('../time')
+
+const PING = 'PING'
+const STALE = 'STALE'
+const LOW_CRYPTO_BALANCE = 'LOW_CRYPTO_BALANCE'
+const HIGH_CRYPTO_BALANCE = 'HIGH_CRYPTO_BALANCE'
+const CASH_BOX_FULL = 'CASH_BOX_FULL'
+const LOW_CASH_OUT = 'LOW_CASH_OUT'
+
+const CODES_DISPLAY = {
+  PING: 'Machine Down',
+  STALE: 'Machine Stuck',
+  LOW_CRYPTO_BALANCE: 'Low Crypto Balance',
+  HIGH_CRYPTO_BALANCE: 'High Crypto Balance',
+  CASH_BOX_FULL: 'Cash box full',
+  LOW_CASH_OUT: 'Low Cash-out'
+}
+
+const NETWORK_DOWN_TIME = 1 * T.minute
+const STALE_STATE = 7 * T.minute
+const ALERT_SEND_INTERVAL = T.hour
+
+module.exports = {
+  PING,
+  STALE,
+  LOW_CRYPTO_BALANCE,
+  HIGH_CRYPTO_BALANCE,
+  CASH_BOX_FULL,
+  LOW_CASH_OUT,
+  CODES_DISPLAY,
+  NETWORK_DOWN_TIME,
+  STALE_STATE,
+  ALERT_SEND_INTERVAL
+}
--- a/lib/notifier/email.js
+++ b/lib/notifier/email.js
@ -0,0 +1,100 @@
+const _ = require('lodash/fp')
+const prettyMs = require('pretty-ms')
+const {
+  PING,
+  STALE,
+  LOW_CRYPTO_BALANCE,
+  HIGH_CRYPTO_BALANCE,
+  CASH_BOX_FULL,
+  LOW_CASH_OUT
+} = require('./codes')
+
+function alertSubject(alertRec, config) {
+  let alerts = []
+
+  if (config.balance) {
+    alerts = _.concat(alerts, alertRec.general)
+  }
+
+  _.keys(alertRec.devices).forEach(function (device) {
+    if (config.balance) {
+      alerts = _.concat(alerts, alertRec.devices[device].balanceAlerts)
+    }
+
+    if (config.errors) {
+      alerts = _.concat(alerts, alertRec.devices[device].deviceAlerts)
+    }
+  })
+
+  if (alerts.length === 0) return null
+
+  const alertTypes = _.map(codeDisplay, _.uniq(_.map('code', alerts))).sort()
+  return '[Lamassu] Errors reported: ' + alertTypes.join(', ')
+}
+
+function printEmailAlerts(alertRec, config) {
+  let body = 'Errors were reported by your Lamassu Machines.\n'
+
+  if (config.balance && alertRec.general.length !== 0) {
+    body = body + '\nGeneral errors:\n'
+    body = body + emailAlerts(alertRec.general) + '\n'
+  }
+
+  _.keys(alertRec.devices).forEach(function (device) {
+    const deviceName = alertRec.deviceNames[device]
+    body = body + '\nErrors for ' + deviceName + ':\n'
+
+    let alerts = []
+    if (config.balance) {
+      alerts = _.concat(alerts, alertRec.devices[device].balanceAlerts)
+    }
+
+    if (config.errors) {
+      alerts = _.concat(alerts, alertRec.devices[device].deviceAlerts)
+    }
+
+    body = body + emailAlerts(alerts)
+  })
+
+  return body
+}
+
+function emailAlerts(alerts) {
+  return alerts.map(emailAlert).join('\n') + '\n'
+}
+
+function formatCurrency(num, code) {
+  return numeral(num).format('0,0.00') + ' ' + code
+}
+
+function emailAlert(alert) {
+  switch (alert.code) {
+    case PING:
+      if (alert.age) {
+        const pingAge = prettyMs(alert.age, { compact: true, verbose: true })
+        return `Machine down for ${pingAge}`
+      }
+      return 'Machine down for a while.'
+    case STALE: {
+      const stuckAge = prettyMs(alert.age, { compact: true, verbose: true })
+      return `Machine is stuck on ${alert.state} screen for ${stuckAge}`
+    }
+    case LOW_CRYPTO_BALANCE: {
+      const balance = formatCurrency(alert.fiatBalance.balance, alert.fiatCode)
+      return `Low balance in ${alert.cryptoCode} [${balance}]`
+    }
+    case HIGH_CRYPTO_BALANCE: {
+      const highBalance = formatCurrency(
+        alert.fiatBalance.balance,
+        alert.fiatCode
+      )
+      return `High balance in ${alert.cryptoCode} [${highBalance}]`
+    }
+    case CASH_BOX_FULL:
+      return `Cash box full on ${alert.machineName} [${alert.notes} banknotes]`
+    case LOW_CASH_OUT:
+      return `Cassette for ${alert.denomination} ${alert.fiatCode} low [${alert.notes} banknotes]`
+  }
+}
+
+module.exports = { alertSubject, printEmailAlerts }
--- a/lib/notifier/index.js
+++ b/lib/notifier/index.js
@ -0,0 +1,139 @@
+const { STALE, STALE_STATE } = require('./codes')
+
+const _ = require('lodash/fp')
+const queries = require('./queries')
+const logger = require('../logger')
+
+const utils = require('./utils')
+const emailFuncs = require('./email')
+const smsFuncs = require('./sms')
+
+function buildMessage(alerts, notifications) {
+  const smsEnabled = utils.isActive(notifications.sms)
+  const emailEnabled = utils.isActive(notifications.email)
+
+  let rec = {}
+  if (smsEnabled) {
+    rec = _.set(['sms', 'body'])(
+      smsFuncs.printSmsAlerts(alerts, notifications.sms)
+    )(rec)
+  }
+  if (emailEnabled) {
+    rec = _.set(['email', 'subject'])(
+      emailFuncs.alertSubject(alerts, notifications.email)
+    )(rec)
+    rec = _.set(['email', 'body'])(
+      emailFuncs.printEmailAlerts(alerts, notifications.email)
+    )(rec)
+  }
+
+  return rec
+}
+
+function checkNotification(plugins) {
+  const notifications = plugins.getNotificationConfig()
+  const smsEnabled = utils.isActive(notifications.sms)
+  const emailEnabled = utils.isActive(notifications.email)
+
+  if (!smsEnabled && !emailEnabled) return Promise.resolve()
+
+  return getAlerts(plugins)
+    .then(alerts => {
+      const currentAlertFingerprint = utils.buildAlertFingerprint(
+        alerts,
+        notifications
+      )
+      if (!currentAlertFingerprint) {
+        const inAlert = !!utils.getAlertFingerprint()
+        // (fingerprint = null, lastAlertTime = null)
+        utils.setAlertFingerprint(null, null)
+        if (inAlert) {
+          return utils.sendNoAlerts(plugins, smsEnabled, emailEnabled)
+        }
+      }
+      if (utils.shouldNotAlert(currentAlertFingerprint)) {
+        return
+      }
+
+      const message = buildMessage(alerts, notifications)
+      utils.setAlertFingerprint(currentAlertFingerprint, Date.now())
+      return plugins.sendMessage(message)
+    })
+    .then(results => {
+      if (results && results.length > 0)
+        logger.debug('Successfully sent alerts')
+    })
+    .catch(logger.error)
+}
+
+function getAlerts(plugins) {
+  return Promise.all([
+    plugins.checkBalances(),
+    queries.machineEvents(),
+    plugins.getMachineNames()
+  ]).then(([balances, events, devices]) =>
+    buildAlerts(checkPings(devices), balances, events, devices)
+  )
+}
+
+function buildAlerts(pings, balances, events, devices) {
+  const alerts = { devices: {}, deviceNames: {} }
+  alerts.general = _.filter(r => !r.deviceId, balances)
+  devices.forEach(function (device) {
+    const deviceId = device.deviceId
+    const deviceName = device.name
+    const deviceEvents = events.filter(function (eventRow) {
+      return eventRow.device_id === deviceId
+    })
+    const ping = pings[deviceId] || []
+    const stuckScreen = checkStuckScreen(deviceEvents, deviceName)
+
+    if (!alerts.devices[deviceId]) alerts.devices[deviceId] = {}
+    alerts.devices[deviceId].balanceAlerts = _.filter(
+      ['deviceId', deviceId],
+      balances
+    )
+    alerts.devices[deviceId].deviceAlerts = _.isEmpty(ping) ? stuckScreen : ping
+
+    alerts.deviceNames[deviceId] = deviceName
+  })
+  return alerts
+}
+
+function checkPings(devices) {
+  const deviceIds = _.map('deviceId', devices)
+  const pings = _.map(utils.checkPing, devices)
+  return _.zipObject(deviceIds)(pings)
+}
+
+function checkStuckScreen(deviceEvents, machineName) {
+  const sortedEvents = _.sortBy(
+    utils.getDeviceTime,
+    _.map(utils.parseEventNote, deviceEvents)
+  )
+  const lastEvent = _.last(sortedEvents)
+
+  if (!lastEvent) {
+    return []
+  }
+
+  const state = lastEvent.note.state
+  const isIdle = lastEvent.note.isIdle
+
+  if (isIdle) {
+    return []
+  }
+
+  const age = Math.floor(lastEvent.age)
+  if (age > STALE_STATE) {
+    return [{ code: STALE, state, age, machineName }]
+  }
+
+  return []
+}
+
+module.exports = {
+  checkNotification,
+  checkPings,
+  checkStuckScreen
+}
--- a/lib/notifier/queries.js
+++ b/lib/notifier/queries.js
@ -0,0 +1,3 @@
+const dbm = require('../postgresql_interface')
+
+module.exports = { machineEvents: dbm.machineEvents }
--- a/lib/notifier/sms.js
+++ b/lib/notifier/sms.js
@ -0,0 +1,53 @@
+const _ = require('lodash/fp')
+const utils = require('./utils')
+
+function printSmsAlerts(alertRec, config) {
+  let alerts = []
+
+  if (config.balance) {
+    alerts = _.concat(alerts, alertRec.general)
+  }
+
+  _.keys(alertRec.devices).forEach(function (device) {
+    if (config.balance) {
+      alerts = _.concat(alerts, alertRec.devices[device].balanceAlerts)
+    }
+
+    if (config.errors) {
+      alerts = _.concat(alerts, alertRec.devices[device].deviceAlerts)
+    }
+  })
+
+  if (alerts.length === 0) return null
+
+  const alertsMap = _.groupBy('code', alerts)
+
+  const alertTypes = _.map(entry => {
+    const code = entry[0]
+    const machineNames = _.filter(
+      _.negate(_.isEmpty),
+      _.map('machineName', entry[1])
+    )
+
+    return {
+      codeDisplay: utils.codeDisplay(code),
+      machineNames
+    }
+  }, _.toPairs(alertsMap))
+
+  const mapByCodeDisplay = _.map(it =>
+    _.isEmpty(it.machineNames)
+      ? it.codeDisplay
+      : `${it.codeDisplay} (${it.machineNames.join(', ')})`
+  )
+
+  const displayAlertTypes = _.compose(
+    _.uniq,
+    mapByCodeDisplay,
+    _.sortBy('codeDisplay')
+  )(alertTypes)
+
+  return '[Lamassu] Errors reported: ' + displayAlertTypes.join(', ')
+}
+
+module.exports = { printSmsAlerts }
--- a/lib/notifier/test/email.test.js
+++ b/lib/notifier/test/email.test.js
@ -0,0 +1,28 @@
+const email = require('../email')
+
+const alertRec = {
+  devices: {
+    f02af604ca9010bd9ae04c427a24da90130da10d355f0a9b235886a89008fc05: {
+      balanceAlerts: [],
+      deviceAlerts: [
+        { code: 'PING', age: 602784301.446, machineName: 'Abc123' }
+      ]
+    }
+  },
+  deviceNames: {
+    f02af604ca9010bd9ae04c427a24da90130da10d355f0a9b235886a89008fc05: 'Abc123'
+  },
+  general: []
+}
+
+const printEmailMsg = `Errors were reported by your Lamassu Machines.
+
+Errors for Abc123:
+Machine down for ~6 days
+`
+
+test('Print Email Alers', () => {
+  expect(email.printEmailAlerts(alertRec, { active: true, errors: true })).toBe(
+    printEmailMsg
+  )
+})
--- a/lib/notifier/test/notifier.test.js
+++ b/lib/notifier/test/notifier.test.js
@ -0,0 +1,234 @@
+const notifier = require('..')
+
+// mock plugins object with mock data to test functions
+const plugins = {
+  sendMessage: rec => {
+    return rec
+  },
+  getNotificationConfig: () => ({
+    email_active: false,
+    sms_active: true,
+    email_errors: false,
+    sms_errors: true,
+    sms: { active: true, errors: true },
+    email: { active: false, errors: false }
+  }),
+  getMachineNames: () => [
+    {
+      deviceId:
+        'f02af604ca9010bd9ae04c427a24da90130da10d355f0a9b235886a89008fc05',
+      cashbox: 0,
+      cassette1: 444,
+      cassette2: 222,
+      version: '7.5.0-beta.0',
+      model: 'unknown',
+      pairedAt: '2020-11-13T16:20:31.624Z',
+      lastPing: '2020-11-16T13:11:03.169Z',
+      name: 'Abc123',
+      paired: true,
+      cashOut: true,
+      statuses: [{ label: 'Unresponsive', type: 'error' }]
+    }
+  ],
+  checkBalances: () => []
+}
+
+const devices = [
+  {
+    deviceId:
+      '7e531a2666987aa27b9917ca17df7998f72771c57fdb21c90bc033999edd17e4',
+    lastPing: '2020-11-16T13:11:03.169Z',
+    name: 'Abc123'
+  },
+  {
+    deviceId:
+      '9871e58aa2643ff9445cbc299b50397430ada75157d6c29b4c93548fff0f48f7',
+    lastPing: '2020-11-16T16:21:35.948Z',
+    name: 'Machine 2'
+  },
+  {
+    deviceId:
+      '5ae0d02dedeb77b6521bd5eb7c9159bdc025873fa0bcb6f87aaddfbda0c50913',
+    lastPing: '2020-11-19T15:07:57.089Z',
+    name: 'Machine 3'
+  },
+  {
+    deviceId:
+      'f02af604ca9010bd9ae04c427a24da90130da10d355f0a9b235886a89008fc05',
+    lastPing: '2020-11-23T19:34:41.031Z',
+    name: 'New Machine 4 '
+  }
+]
+
+test('Exits checkNotifications with Promise.resolve() if SMS and Email are disabled', async () => {
+  expect.assertions(1)
+  await expect(
+    notifier.checkNotification({
+      getNotificationConfig: () => ({
+        sms: { active: false, errors: false },
+        email: { active: false, errors: false }
+      })
+    })
+  ).resolves.toBe(undefined)
+})
+
+test('Exits checkNotifications with Promise.resolve() if SMS and Email are disabled even if errors or balance are defined to something', async () => {
+  expect.assertions(1)
+  await expect(
+    notifier.checkNotification({
+      getNotificationConfig: () => ({
+        sms: { active: false, errors: true, balance: true },
+        email: { active: false, errors: true, balance: true }
+      })
+    })
+  ).resolves.toBe(undefined)
+})
+
+test("Check Pings should return code PING for devices that haven't been pinged recently", () => {
+  expect(
+    notifier.checkPings([
+      {
+        deviceId:
+          '7e531a2666987aa27b9917ca17df7998f72771c57fdb21c90bc033999edd17e4',
+        lastPing: '2020-11-16T13:11:03.169Z',
+        name: 'Abc123'
+      }
+    ])
+  ).toMatchObject({
+    '7e531a2666987aa27b9917ca17df7998f72771c57fdb21c90bc033999edd17e4': [
+      { code: 'PING', machineName: 'Abc123' }
+    ]
+  })
+})
+
+test('Checkpings returns empty array as the value for the id prop, if the lastPing is more recent than 60 seconds', () => {
+  expect(
+    notifier.checkPings([
+      {
+        deviceId:
+          '7a531a2666987aa27b9917ca17df7998f72771c57fdb21c90bc033999edd17e4',
+        lastPing: new Date(),
+        name: 'Abc123'
+      }
+    ])
+  ).toMatchObject({
+    '7a531a2666987aa27b9917ca17df7998f72771c57fdb21c90bc033999edd17e4': []
+  })
+})
+
+afterEach(() => {
+  // https://stackoverflow.com/questions/58151010/difference-between-resetallmocks-resetmodules-resetmoduleregistry-restoreallm
+  jest.restoreAllMocks()
+})
+
+const utils = require('../utils')
+
+test('Check notification resolves to undefined if shouldNotAlert is called and is true', async () => {
+  const mockShouldNotAlert = jest.spyOn(utils, 'shouldNotAlert')
+  mockShouldNotAlert.mockReturnValue(true)
+  
+  const result = await notifier.checkNotification(plugins)
+  expect(mockShouldNotAlert).toHaveBeenCalledTimes(1)
+  expect(result).toBe(undefined)
+})
+
+test('Sendmessage is called if shouldNotAlert is called and is false', async () => {
+  const mockShouldNotAlert = jest.spyOn(utils, 'shouldNotAlert')
+  const mockSendMessage = jest.spyOn(plugins, 'sendMessage')
+
+  mockShouldNotAlert.mockReturnValue(false)
+  const result = await notifier.checkNotification(plugins)
+
+  expect(mockShouldNotAlert).toHaveBeenCalledTimes(1)
+  expect(mockSendMessage).toHaveBeenCalledTimes(1)
+  expect(result).toBe(undefined)
+})
+
+test('If no alert fingerprint and inAlert is true, exits on call to sendNoAlerts', async () => {
+  // mock utils.buildAlertFingerprint to return null
+  // mock utils.getAlertFingerprint to be true which will make inAlert true
+
+  const buildFp = jest.spyOn(utils, 'buildAlertFingerprint')
+  const mockGetFp = jest.spyOn(utils, 'getAlertFingerprint')
+  const mockSendNoAlerts = jest.spyOn(utils, 'sendNoAlerts')
+
+  buildFp.mockReturnValue(null)
+  mockGetFp.mockReturnValue(true)
+  await notifier.checkNotification(plugins)
+
+  expect(mockGetFp).toHaveBeenCalledTimes(1)
+  expect(mockSendNoAlerts).toHaveBeenCalledTimes(1)
+})
+
+
+// vvv tests for checkstuckscreen...
+test('checkStuckScreen returns [] when no events are found', () => {
+  expect(notifier.checkStuckScreen([], 'Abc123')).toEqual([])
+})
+
+test('checkStuckScreen returns [] if most recent event is idle', () => {
+  // device_time is what matters for the sorting of the events by recency
+  expect(notifier.checkStuckScreen([{
+    id: '48ae51c6-c5b4-485e-b81d-aa337fc025e2',
+    device_id: 'f02af604ca9010bd9ae04c427a24da90130da10d355f0a9b235886a89008fc05',
+    event_type: 'stateChange',
+    note: '{"state":"chooseCoin","isIdle":false}',
+    created: "2020-11-23T19:30:29.209Z",
+    device_time: "1999-11-23T19:30:29.177Z",
+    age: 157352628.123
+  }, {
+    id: '48ae51c6-c5b4-485e-b81d-aa337fc025e2',
+    device_id: 'f02af604ca9010bd9ae04c427a24da90130da10d355f0a9b235886a89008fc05',
+    event_type: 'stateChange',
+    note: '{"state":"chooseCoin","isIdle":true}',
+    created: "2020-11-23T19:30:29.209Z",
+    device_time: "2020-11-23T19:30:29.177Z",
+    age: 157352628.123
+  }])).toEqual([])
+})
+
+test('checkStuckScreen returns object array of length 1 with prop code: "STALE" if age > STALE_STATE', () => {
+  // there is an age 0 and an isIdle true in the first object but it will be below the second one in the sorting order and thus ignored
+  const result = notifier.checkStuckScreen([{
+    id: '48ae51c6-c5b4-485e-b81d-aa337fc025e2',
+    device_id: 'f02af604ca9010bd9ae04c427a24da90130da10d355f0a9b235886a89008fc05',
+    event_type: 'stateChange',
+    note: '{"state":"chooseCoin","isIdle":true}',
+    created: "2020-11-23T19:30:29.209Z",
+    device_time: "1999-11-23T19:30:29.177Z",
+    age: 0
+  }, {
+    id: '48ae51c6-c5b4-485e-b81d-aa337fc025e2',
+    device_id: 'f02af604ca9010bd9ae04c427a24da90130da10d355f0a9b235886a89008fc05',
+    event_type: 'stateChange',
+    note: '{"state":"chooseCoin","isIdle":false}',
+    created: "2020-11-23T19:30:29.209Z",
+    device_time: "2020-11-23T19:30:29.177Z",
+    age: 157352628.123
+  }])
+  expect(result[0]).toMatchObject({code: "STALE"})
+})
+
+test('checkStuckScreen returns empty array if age < STALE_STATE', () => {
+  const STALE_STATE = require("../codes").STALE_STATE
+  const result1 = notifier.checkStuckScreen([{
+    id: '48ae51c6-c5b4-485e-b81d-aa337fc025e2',
+    device_id: 'f02af604ca9010bd9ae04c427a24da90130da10d355f0a9b235886a89008fc05',
+    event_type: 'stateChange',
+    note: '{"state":"chooseCoin","isIdle":false}',
+    created: "2020-11-23T19:30:29.209Z",
+    device_time: "2020-11-23T19:30:29.177Z",
+    age: 0
+  }])
+  const result2 = notifier.checkStuckScreen([{
+    id: '48ae51c6-c5b4-485e-b81d-aa337fc025e2',
+    device_id: 'f02af604ca9010bd9ae04c427a24da90130da10d355f0a9b235886a89008fc05',
+    event_type: 'stateChange',
+    note: '{"state":"chooseCoin","isIdle":false}',
+    created: "2020-11-23T19:30:29.209Z",
+    device_time: "2020-11-23T19:30:29.177Z",
+    age: STALE_STATE
+  }])
+  expect(result1).toEqual([])
+  expect(result2).toEqual([])
+})
--- a/lib/notifier/test/sms.test.js
+++ b/lib/notifier/test/sms.test.js
@ -0,0 +1,22 @@
+const sms = require('../sms')
+
+const alertRec = {
+  devices: {
+    f02af604ca9010bd9ae04c427a24da90130da10d355f0a9b235886a89008fc05: {
+      balanceAlerts: [],
+      deviceAlerts: [
+        { code: 'PING', age: 602784301.446, machineName: 'Abc123' }
+      ]
+    }
+  },
+  deviceNames: {
+    f02af604ca9010bd9ae04c427a24da90130da10d355f0a9b235886a89008fc05: 'Abc123'
+  },
+  general: []
+}
+
+test('Print SMS alerts', () => {
+  expect(sms.printSmsAlerts(alertRec, { active: true, errors: true })).toBe(
+    '[Lamassu] Errors reported: Machine Down (Abc123)'
+  )
+})
--- a/lib/notifier/test/utils.test.js
+++ b/lib/notifier/test/utils.test.js
@ -0,0 +1,100 @@
+const utils = require('../utils')
+
+const plugins = {
+  sendMessage: rec => {
+    return rec
+  }
+}
+
+const alertRec = {
+  devices: {
+    f02af604ca9010bd9ae04c427a24da90130da10d355f0a9b235886a89008fc05: {
+      balanceAlerts: [],
+      deviceAlerts: [
+        { code: 'PING', age: 1605532263169, machineName: 'Abc123' }
+      ]
+    }
+  },
+  deviceNames: {
+    f02af604ca9010bd9ae04c427a24da90130da10d355f0a9b235886a89008fc05: 'Abc123'
+  },
+  general: []
+}
+
+const notifications = {
+  sms: { active: true, errors: true },
+  email: { active: false, errors: false }
+}
+
+test('Build alert fingerprint returns null if no sms or email alerts', () => {
+  expect(
+    utils.buildAlertFingerprint(
+      {
+        devices: {},
+        deviceNames: {},
+        general: []
+      },
+      notifications
+    )
+  ).toBe(null)
+})
+
+test('Build alert fingerprint returns null if sms and email are disabled', () => {
+  expect(
+    utils.buildAlertFingerprint(alertRec, {
+      sms: { active: false, errors: true },
+      email: { active: false, errors: false }
+    })
+  ).toBe(null)
+})
+
+test('Build alert fingerprint returns hash if email or [sms] are enabled and there are alerts in alertrec', () => {
+  expect(
+    typeof utils.buildAlertFingerprint(alertRec, {
+      sms: { active: true, errors: true },
+      email: { active: false, errors: false }
+    })
+  ).toBe('string')
+})
+
+test('Build alert fingerprint returns hash if [email] or sms are enabled and there are alerts in alertrec', () => {
+  expect(
+    typeof utils.buildAlertFingerprint(alertRec, {
+      sms: { active: false, errors: false },
+      email: { active: true, errors: true }
+    })
+  ).toBe('string')
+})
+
+test('Send no alerts returns empty object with sms and email disabled', () => {
+  expect(utils.sendNoAlerts(plugins, false, false)).toEqual({})
+})
+
+test('Send no alerts returns object with sms prop with sms only enabled', () => {
+  expect(utils.sendNoAlerts(plugins, true, false)).toEqual({
+    sms: {
+      body: '[Lamassu] All clear'
+    }
+  })
+})
+
+test('Send no alerts returns object with sms and email prop with both enabled', () => {
+  expect(utils.sendNoAlerts(plugins, true, true)).toEqual({
+    email: {
+      body: 'No errors are reported for your machines.',
+      subject: '[Lamassu] All clear'
+    },
+    sms: {
+      body: '[Lamassu] All clear'
+    }
+  })
+})
+
+test('Send no alerts returns object with email prop if only email is enabled', () => {
+  expect(utils.sendNoAlerts(plugins, false, true)).toEqual({
+    email: {
+      body: 'No errors are reported for your machines.',
+      subject: '[Lamassu] All clear'
+    }
+  })
+})
--- a/lib/notifier/utils.js
+++ b/lib/notifier/utils.js
@ -0,0 +1,111 @@
+const _ = require('lodash/fp')
+const crypto = require('crypto')
+const {
+  CODES_DISPLAY,
+  NETWORK_DOWN_TIME,
+  PING,
+  ALERT_SEND_INTERVAL
+} = require('./codes')
+
+function parseEventNote(event) {
+  return _.set('note', JSON.parse(event.note), event)
+}
+
+function checkPing(device) {
+  const age = +Date.now() - +new Date(device.lastPing)
+  if (age > NETWORK_DOWN_TIME)
+    return [{ code: PING, age, machineName: device.name }]
+  return []
+}
+
+const getDeviceTime = _.flow(_.get('device_time'), Date.parse)
+
+const isActive = it => it.active && (it.balance || it.errors)
+
+const codeDisplay = code => CODES_DISPLAY[code]
+
+const alertFingerprint = {
+  fingerprint: null,
+  lastAlertTime: null
+}
+
+const getAlertFingerprint = () => alertFingerprint.fingerprint
+
+const getLastAlertTime = () => alertFingerprint.lastAlertTime
+
+const setAlertFingerprint = (fp, time = Date.now()) => {
+  alertFingerprint.fingerprint = fp
+  alertFingerprint.lastAlertTime = time
+}
+
+const shouldNotAlert = currentAlertFingerprint => {
+  return (
+    currentAlertFingerprint === getAlertFingerprint() &&
+    getLastAlertTime() - Date.now() < ALERT_SEND_INTERVAL
+  )
+}
+
+function getAlertTypes(alertRec, config) {
+  let alerts = []
+  if (!isActive(config)) return alerts
+
+  if (config.balance) {
+    alerts = _.concat(alerts, alertRec.general)
+  }
+
+  _.keys(alertRec.devices).forEach(function (device) {
+    if (config.balance) {
+      alerts = _.concat(alerts, alertRec.devices[device].balanceAlerts)
+    }
+
+    if (config.errors) {
+      alerts = _.concat(alerts, alertRec.devices[device].deviceAlerts)
+    }
+  })
+
+  return alerts
+}
+
+function buildAlertFingerprint(alertRec, notifications) {
+  const sms = getAlertTypes(alertRec, notifications.sms)
+  const email = getAlertTypes(alertRec, notifications.email)
+  if (sms.length === 0 && email.length === 0) return null
+
+  const smsTypes = _.map(codeDisplay, _.uniq(_.map('code', sms))).sort()
+  const emailTypes = _.map(codeDisplay, _.uniq(_.map('code', email))).sort()
+
+  const subject = _.concat(smsTypes, emailTypes).join(', ')
+  return crypto.createHash('sha256').update(subject).digest('hex')
+}
+
+function sendNoAlerts(plugins, smsEnabled, emailEnabled) {
+  const subject = '[Lamassu] All clear'
+
+  let rec = {}
+  if (smsEnabled) {
+    rec = _.set(['sms', 'body'])(subject)(rec)
+  }
+
+  if (emailEnabled) {
+    rec = _.set(['email', 'subject'])(subject)(rec)
+    rec = _.set(['email', 'body'])('No errors are reported for your machines.')(
+      rec
+    )
+  }
+
+  return plugins.sendMessage(rec)
+}
+
+module.exports = {
+  codeDisplay,
+  parseEventNote,
+  getDeviceTime,
+  checkPing,
+  isActive,
+  getAlertFingerprint,
+  getLastAlertTime,
+  setAlertFingerprint,
+  shouldNotAlert,
+  buildAlertFingerprint,
+  sendNoAlerts
+}
--- a/lib/plugins/sms/mock-sms/mock-sms.js
+++ b/lib/plugins/sms/mock-sms/mock-sms.js
@ -2,7 +2,7 @@ const _ = require('lodash/fp')

 exports.NAME = 'MockSMS'

-exports.sendMessage = function sendMessage (account, rec) {
+exports.sendMessage = function sendMessage(account, rec) {
  console.log('Sending SMS: %j', rec)
  return new Promise((resolve, reject) => {
    if (_.endsWith('666', _.getOr(false, 'sms.toNumber', rec))) {
--- a/package-lock.json
+++ b/package-lock.json
@ -57,19 +57,19 @@
      }
    },
    "@babel/core": {
-      "version": "7.12.10",
-      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.12.10.tgz",
-      "integrity": "sha512-eTAlQKq65zHfkHZV0sIVODCPGVgoo1HdBlbSLi9CqOzuZanMv2ihzY+4paiKr1mH+XmYESMAmJ/dpZ68eN6d8w==",
+      "version": "7.12.3",
+      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.12.3.tgz",
+      "integrity": "sha512-0qXcZYKZp3/6N2jKYVxZv0aNCsxTSVCiK72DTiTYZAu7sjg73W0/aynWjMbiGd87EQL4WyA8reiJVh92AVla9g==",
      "dev": true,
      "requires": {
        "@babel/code-frame": "^7.10.4",
-        "@babel/generator": "^7.12.10",
+        "@babel/generator": "^7.12.1",
        "@babel/helper-module-transforms": "^7.12.1",
-        "@babel/helpers": "^7.12.5",
-        "@babel/parser": "^7.12.10",
-        "@babel/template": "^7.12.7",
-        "@babel/traverse": "^7.12.10",
-        "@babel/types": "^7.12.10",
+        "@babel/helpers": "^7.12.1",
+        "@babel/parser": "^7.12.3",
+        "@babel/template": "^7.10.4",
+        "@babel/traverse": "^7.12.1",
+        "@babel/types": "^7.12.1",
        "convert-source-map": "^1.7.0",
        "debug": "^4.1.0",
        "gensync": "^1.0.0-beta.1",
@ -119,6 +119,23 @@
        "source-map": "^0.5.0"
      },
      "dependencies": {
+        "@babel/helper-validator-identifier": {
+          "version": "7.12.11",
+          "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.12.11.tgz",
+          "integrity": "sha512-np/lG3uARFybkoHokJUmf1QfEvRVCPbmQeUQpKow5cQ3xWrV9i3rUHodKDJPQfTVX61qKi+UdYk8kik84n7XOw==",
+          "dev": true
+        },
+        "@babel/types": {
+          "version": "7.12.12",
+          "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.12.12.tgz",
+          "integrity": "sha512-lnIX7piTxOH22xE7fDXDbSHg9MM1/6ORnafpJmov5rs0kX5g4BZxeXNJLXsMRiO0U5Rb8/FvMS6xlTnTHvxonQ==",
+          "dev": true,
+          "requires": {
+            "@babel/helper-validator-identifier": "^7.12.11",
+            "lodash": "^4.17.19",
+            "to-fast-properties": "^2.0.0"
+          }
+        },
        "source-map": {
          "version": "0.5.7",
          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
@ -136,6 +153,42 @@
        "@babel/helper-get-function-arity": "^7.12.10",
        "@babel/template": "^7.12.7",
        "@babel/types": "^7.12.11"
+      },
+      "dependencies": {
+        "@babel/helper-validator-identifier": {
+          "version": "7.12.11",
+          "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.12.11.tgz",
+          "integrity": "sha512-np/lG3uARFybkoHokJUmf1QfEvRVCPbmQeUQpKow5cQ3xWrV9i3rUHodKDJPQfTVX61qKi+UdYk8kik84n7XOw==",
+          "dev": true
+        },
+        "@babel/parser": {
+          "version": "7.12.11",
+          "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.12.11.tgz",
+          "integrity": "sha512-N3UxG+uuF4CMYoNj8AhnbAcJF0PiuJ9KHuy1lQmkYsxTer/MAH9UBNHsBoAX/4s6NvlDD047No8mYVGGzLL4hg==",
+          "dev": true
+        },
+        "@babel/template": {
+          "version": "7.12.7",
+          "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.12.7.tgz",
+          "integrity": "sha512-GkDzmHS6GV7ZeXfJZ0tLRBhZcMcY0/Lnb+eEbXDBfCAcZCjrZKe6p3J4we/D24O9Y8enxWAg1cWwof59yLh2ow==",
+          "dev": true,
+          "requires": {
+            "@babel/code-frame": "^7.10.4",
+            "@babel/parser": "^7.12.7",
+            "@babel/types": "^7.12.7"
+          }
+        },
+        "@babel/types": {
+          "version": "7.12.12",
+          "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.12.12.tgz",
+          "integrity": "sha512-lnIX7piTxOH22xE7fDXDbSHg9MM1/6ORnafpJmov5rs0kX5g4BZxeXNJLXsMRiO0U5Rb8/FvMS6xlTnTHvxonQ==",
+          "dev": true,
+          "requires": {
+            "@babel/helper-validator-identifier": "^7.12.11",
+            "lodash": "^4.17.19",
+            "to-fast-properties": "^2.0.0"
+          }
+        }
      }
    },
    "@babel/helper-get-function-arity": {
@ -145,15 +198,25 @@
      "dev": true,
      "requires": {
        "@babel/types": "^7.12.10"
-      }
      },
-    "@babel/helper-member-expression-to-functions": {
-      "version": "7.12.7",
-      "resolved": "https://registry.npmjs.org/@babel/helper-member-expression-to-functions/-/helper-member-expression-to-functions-7.12.7.tgz",
-      "integrity": "sha512-DCsuPyeWxeHgh1Dus7APn7iza42i/qXqiFPWyBDdOFtvS581JQePsc1F/nD+fHrcswhLlRc2UpYS1NwERxZhHw==",
+      "dependencies": {
+        "@babel/helper-validator-identifier": {
+          "version": "7.12.11",
+          "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.12.11.tgz",
+          "integrity": "sha512-np/lG3uARFybkoHokJUmf1QfEvRVCPbmQeUQpKow5cQ3xWrV9i3rUHodKDJPQfTVX61qKi+UdYk8kik84n7XOw==",
+          "dev": true
+        },
+        "@babel/types": {
+          "version": "7.12.12",
+          "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.12.12.tgz",
+          "integrity": "sha512-lnIX7piTxOH22xE7fDXDbSHg9MM1/6ORnafpJmov5rs0kX5g4BZxeXNJLXsMRiO0U5Rb8/FvMS6xlTnTHvxonQ==",
          "dev": true,
          "requires": {
-        "@babel/types": "^7.12.7"
+            "@babel/helper-validator-identifier": "^7.12.11",
+            "lodash": "^4.17.19",
+            "to-fast-properties": "^2.0.0"
+          }
+        }
      }
    },
    "@babel/helper-module-imports": {
@ -182,15 +245,6 @@
        "lodash": "^4.17.19"
      }
    },
-    "@babel/helper-optimise-call-expression": {
-      "version": "7.12.10",
-      "resolved": "https://registry.npmjs.org/@babel/helper-optimise-call-expression/-/helper-optimise-call-expression-7.12.10.tgz",
-      "integrity": "sha512-4tpbU0SrSTjjt65UMWSrUOPZTsgvPgGG4S8QSTNHacKzpS51IVWGDj0yCwyeZND/i+LSN2g/O63jEXEWm49sYQ==",
-      "dev": true,
-      "requires": {
-        "@babel/types": "^7.12.10"
-      }
-    },
    "@babel/helper-plugin-utils": {
      "version": "7.10.4",
      "resolved": "https://registry.npmjs.org/@babel/helper-plugin-utils/-/helper-plugin-utils-7.10.4.tgz",
@ -207,6 +261,90 @@
        "@babel/helper-optimise-call-expression": "^7.12.10",
        "@babel/traverse": "^7.12.10",
        "@babel/types": "^7.12.11"
+      },
+      "dependencies": {
+        "@babel/code-frame": {
+          "version": "7.12.11",
+          "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.12.11.tgz",
+          "integrity": "sha512-Zt1yodBx1UcyiePMSkWnU4hPqhwq7hGi2nFL1LeA3EUl+q2LQx16MISgJ0+z7dnmgvP9QtIleuETGOiOH1RcIw==",
+          "dev": true,
+          "requires": {
+            "@babel/highlight": "^7.10.4"
+          }
+        },
+        "@babel/helper-member-expression-to-functions": {
+          "version": "7.12.7",
+          "resolved": "https://registry.npmjs.org/@babel/helper-member-expression-to-functions/-/helper-member-expression-to-functions-7.12.7.tgz",
+          "integrity": "sha512-DCsuPyeWxeHgh1Dus7APn7iza42i/qXqiFPWyBDdOFtvS581JQePsc1F/nD+fHrcswhLlRc2UpYS1NwERxZhHw==",
+          "dev": true,
+          "requires": {
+            "@babel/types": "^7.12.7"
+          }
+        },
+        "@babel/helper-optimise-call-expression": {
+          "version": "7.12.10",
+          "resolved": "https://registry.npmjs.org/@babel/helper-optimise-call-expression/-/helper-optimise-call-expression-7.12.10.tgz",
+          "integrity": "sha512-4tpbU0SrSTjjt65UMWSrUOPZTsgvPgGG4S8QSTNHacKzpS51IVWGDj0yCwyeZND/i+LSN2g/O63jEXEWm49sYQ==",
+          "dev": true,
+          "requires": {
+            "@babel/types": "^7.12.10"
+          }
+        },
+        "@babel/helper-validator-identifier": {
+          "version": "7.12.11",
+          "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.12.11.tgz",
+          "integrity": "sha512-np/lG3uARFybkoHokJUmf1QfEvRVCPbmQeUQpKow5cQ3xWrV9i3rUHodKDJPQfTVX61qKi+UdYk8kik84n7XOw==",
+          "dev": true
+        },
+        "@babel/parser": {
+          "version": "7.12.11",
+          "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.12.11.tgz",
+          "integrity": "sha512-N3UxG+uuF4CMYoNj8AhnbAcJF0PiuJ9KHuy1lQmkYsxTer/MAH9UBNHsBoAX/4s6NvlDD047No8mYVGGzLL4hg==",
+          "dev": true
+        },
+        "@babel/traverse": {
+          "version": "7.12.12",
+          "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.12.12.tgz",
+          "integrity": "sha512-s88i0X0lPy45RrLM8b9mz8RPH5FqO9G9p7ti59cToE44xFm1Q+Pjh5Gq4SXBbtb88X7Uy7pexeqRIQDDMNkL0w==",
+          "dev": true,
+          "requires": {
+            "@babel/code-frame": "^7.12.11",
+            "@babel/generator": "^7.12.11",
+            "@babel/helper-function-name": "^7.12.11",
+            "@babel/helper-split-export-declaration": "^7.12.11",
+            "@babel/parser": "^7.12.11",
+            "@babel/types": "^7.12.12",
+            "debug": "^4.1.0",
+            "globals": "^11.1.0",
+            "lodash": "^4.17.19"
+          }
+        },
+        "@babel/types": {
+          "version": "7.12.12",
+          "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.12.12.tgz",
+          "integrity": "sha512-lnIX7piTxOH22xE7fDXDbSHg9MM1/6ORnafpJmov5rs0kX5g4BZxeXNJLXsMRiO0U5Rb8/FvMS6xlTnTHvxonQ==",
+          "dev": true,
+          "requires": {
+            "@babel/helper-validator-identifier": "^7.12.11",
+            "lodash": "^4.17.19",
+            "to-fast-properties": "^2.0.0"
+          }
+        },
+        "debug": {
+          "version": "4.3.1",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.1.tgz",
+          "integrity": "sha512-doEwdvm4PCeK4K3RQN2ZC2BYUBaxwLARCqZmMjtF8a51J2Rb0xpVloFRnCODwqjpwnAoao4pelN8l3RJdv3gRQ==",
+          "dev": true,
+          "requires": {
+            "ms": "2.1.2"
+          }
+        },
+        "ms": {
+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==",
+          "dev": true
+        }
      }
    },
    "@babel/helper-simple-access": {
@ -225,6 +363,25 @@
      "dev": true,
      "requires": {
        "@babel/types": "^7.12.11"
+      },
+      "dependencies": {
+        "@babel/helper-validator-identifier": {
+          "version": "7.12.11",
+          "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.12.11.tgz",
+          "integrity": "sha512-np/lG3uARFybkoHokJUmf1QfEvRVCPbmQeUQpKow5cQ3xWrV9i3rUHodKDJPQfTVX61qKi+UdYk8kik84n7XOw==",
+          "dev": true
+        },
+        "@babel/types": {
+          "version": "7.12.12",
+          "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.12.12.tgz",
+          "integrity": "sha512-lnIX7piTxOH22xE7fDXDbSHg9MM1/6ORnafpJmov5rs0kX5g4BZxeXNJLXsMRiO0U5Rb8/FvMS6xlTnTHvxonQ==",
+          "dev": true,
+          "requires": {
+            "@babel/helper-validator-identifier": "^7.12.11",
+            "lodash": "^4.17.19",
+            "to-fast-properties": "^2.0.0"
+          }
+        }
      }
    },
    "@babel/helper-validator-identifier": {
@ -256,9 +413,9 @@
      }
    },
    "@babel/parser": {
-      "version": "7.12.11",
-      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.12.11.tgz",
-      "integrity": "sha512-N3UxG+uuF4CMYoNj8AhnbAcJF0PiuJ9KHuy1lQmkYsxTer/MAH9UBNHsBoAX/4s6NvlDD047No8mYVGGzLL4hg==",
+      "version": "7.12.5",
+      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.12.5.tgz",
+      "integrity": "sha512-FVM6RZQ0mn2KCf1VUED7KepYeUWoVShczewOCfm3nzoBybaih51h+sYVVGthW9M6lPByEPTQf+xm27PBdlpwmQ==",
      "dev": true
    },
    "@babel/plugin-syntax-async-generators": {
@ -385,28 +542,28 @@
      }
    },
    "@babel/template": {
-      "version": "7.12.7",
-      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.12.7.tgz",
-      "integrity": "sha512-GkDzmHS6GV7ZeXfJZ0tLRBhZcMcY0/Lnb+eEbXDBfCAcZCjrZKe6p3J4we/D24O9Y8enxWAg1cWwof59yLh2ow==",
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.10.4.tgz",
+      "integrity": "sha512-ZCjD27cGJFUB6nmCB1Enki3r+L5kJveX9pq1SvAUKoICy6CZ9yD8xO086YXdYhvNjBdnekm4ZnaP5yC8Cs/1tA==",
      "dev": true,
      "requires": {
        "@babel/code-frame": "^7.10.4",
-        "@babel/parser": "^7.12.7",
-        "@babel/types": "^7.12.7"
+        "@babel/parser": "^7.10.4",
+        "@babel/types": "^7.10.4"
      }
    },
    "@babel/traverse": {
-      "version": "7.12.12",
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