Log unhandled errors that occur upon startup or handling HTTP requests

app.js

@@ -39,4 +39,9 @@ glob.sync(scriptsToLoad).forEach((file) => {
   require(file)(app)
 })
 
+app.use(function logUnhandledErrors (err, req, res, next) {
+  logger.error(err, 'Unhandled error while responding to incoming HTTP request')
+  res.status(500).end()
+})
+
 module.exports = app

server.js

@@ -39,3 +39,13 @@ if (process.env.SSE_RELAY) {
     }
   }
 }
+
+function logUnhandledException (err) {
+  logger.fatal(err, 'Unchaught exception, terminating bot process immediately')
+
+  // leave time for error to be written to disk before exiting process
+  setTimeout(() => process.exit(1), 10)
+}
+
+process.on('uncaughtException', logUnhandledException)
+process.on('unhandledRejection', logUnhandledException)