Adds email notifications for server restarts and worker issues

app/helper/email/admin/SERVER_START.txt

@@ -0,0 +1,6 @@
+Node server started
+
+Log in to server and grep:
+
+tail -n 100000 logs/app.log | grep "Starting pid"
+

app/helper/email/admin/WORKER_ERROR.txt

@@ -0,0 +1,6 @@
+Node worker errored
+
+Log in to server and grep:
+
+tail -n 100000 logs/app.log | grep -B 100 "Worker died unexpectedly"
+

app/helper/email/index.js

@@ -63,13 +63,15 @@ var MESSAGES = [
   "RECOVERED",
   "REVOKED",
   "SET_PASSWORD",
+  "SERVER_START",
   "SUBSCRIPTION_DECREASE",
   "SYNC_DOWN",
   "SYNC_EXCEPTION",
   "UPCOMING_RENEWAL",
   "UPCOMING_EXPIRY",
   "UPDATE_BILLING",
   "WARNING_LOW_DISK_SPACE",
+  "WORKER_ERROR"
 ];
 
 var globals = {

app/index.js

@@ -3,6 +3,7 @@ const fs = require("fs-extra");
 const config = require("config");
 const cluster = require("cluster");
 const clfdate = require("helper/clfdate");
+const email = require("helper/email");
 
 if (cluster.isMaster) {
   const NUMBER_OF_CORES = require("os").cpus().length;
@@ -16,6 +17,8 @@ if (cluster.isMaster) {
     `Starting pid=${process.pid} environment=${config.environment} cache=${config.cache}`
   );
 
+  email.SERVER_START();
+
   // Write the master process PID so we can signal it
   fs.writeFileSync(config.pidfile, process.pid.toString(), "utf-8");
 
@@ -40,6 +43,7 @@ if (cluster.isMaster) {
     if (worker.exitedAfterDisconnect === false) {
       console.log(clfdate(), "Worker died unexpectedly, starting a new one");
       cluster.fork();
+      email.WORKER_ERROR();
       // worker processes can have scheduled tasks to publish
       // scheduled entries in future – if the worker dies it's
       // important the master process instead schedules the task