lots of notifier improvements

lib/notifier.js

@@ -1,4 +1,7 @@
+var crypto = require('crypto')
 var R = require('ramda')
+var prettyMs = require('pretty-ms')
+var numeral = require('numeral')
 var db = null
 var getBalances = null
 
@@ -21,7 +24,7 @@ function sameState (a, b) {
 function checkBalance (rec) {
   var LOW_BALANCE_THRESHOLD = 10
   return rec.fiatBalance < LOW_BALANCE_THRESHOLD
-  ? {code: 'lowBalance', cryptoCode: rec.cryptoCode, fiatBalance: rec.fiatBalance}
+  ? {code: 'lowBalance', cryptoCode: rec.cryptoCode, fiatBalance: rec.fiatBalance, fiatCode: rec.fiatCode}
   : null
 }
 
@@ -110,5 +113,65 @@ function checkStatus () {
 
     return alerts
   })
+  .catch(function (err) {
+    console.log(err.stack)
+  })
 }
 exports.checkStatus = checkStatus
+
+function formatCurrency (num, code) {
+  return numeral(num).format('0,0.00') + ' ' + code
+}
+
+function emailAlert (alert) {
+  switch (alert.code) {
+    case 'ping':
+      var pingAge = prettyMs(alert.age, {compact: true, verbose: true})
+      return 'Connection to machine down for ' + pingAge
+    case 'stale':
+      var stuckAge = prettyMs(alert.age, {compact: true, verbose: true})
+      return 'Machine is stuck on ' + alert.state + 'screen for ' + stuckAge
+    case 'lowBalance':
+      var balance = formatCurrency(alert.fiatBalance, alert.fiatCode)
+      return 'Low balance of ' + balance + ' in ' + alert.cryptoCode + ' wallet'
+  }
+}
+
+function emailAlerts (alerts) {
+  return alerts.map(emailAlert).join('\n') + '\n'
+}
+
+function printEmailAlerts (alertRec) {
+  var body = 'Errors were reported by your Lamassu Machines.\n'
+
+  if (alertRec.general.length !== 0) {
+    body = body + '\nGeneral errors:\n'
+    body = body + emailAlerts(alertRec.general)
+  }
+
+  R.keys(alertRec.devices).forEach(function (device) {
+    body = body + '\nErrors for ' + device + ':\n'
+    body = body + emailAlerts(alertRec.devices[device])
+  })
+
+  return body
+}
+exports.printEmailAlerts = printEmailAlerts
+
+function alertSubject (alertRec) {
+  var alerts = alertRec.general
+  R.keys(alertRec.devices).forEach(function (device) {
+    alerts = R.concat(alerts, alertRec.devices[device])
+  })
+  if (alerts.length === 0) return null
+  var alertTypes = R.uniq(R.pluck('code', alerts)).sort()
+  return '[Lamassu] Errors reported: ' + alertTypes.join(', ')
+}
+exports.alertSubject = alertSubject
+
+function alertFingerprint (alertRec) {
+  var subject = alertSubject(alertRec)
+  if (!subject) return null
+  return crypto.createHash('sha256').update(subject).digest('hex')
+}
+exports.alertFingerprint = alertFingerprint