Disconnect Redis session client when Sails is lowering.

lib/hooks/session/ensure-redis-connection.js

@@ -70,21 +70,31 @@ module.exports = function ensureRedisConnection(app, cb) {
 
   // Bind a "ready" listener so that we know when the client has connected.
   client.once('ready', function onConnectionReady(){
+    // Remove the pre-connection handlers.
     client.removeListener('end', onPreConnectionEnd);
     client.removeListener('error', onPreConnectionError);
+    // Add a new "end" handler.
     client.on('end', function(){
       if (_.isFunction(app.config.session.onDisconnect)) {
         app.config.session.onDisconnect();
       }
       app.log.error('Redis session server went off-line...');
     });
+    // Add a new "error" handler.
     client.on('error', function(err){app.log.verbose('Redis session server reported error: ', err.stack);});
+    // Add a new "ready" handler that will be triggered on a reconnect.
     client.on('ready', function(err){
       if (_.isFunction(app.config.session.onReconnect)) {
         app.config.session.onReconnect();
       }
       app.log.error('Redis session server came back on-line...');
     });
+
+    // When Sails is lowering, disconnect the Redis client so that the process doesn't hang.
+    app.on('lower', function() {
+      client.end(true);
+    });
+
     return cb();
   });