Implement Node Monitor Service

- Check in with online nodes every n ms
- Update nodes that do not reply
- Added node object record helper
- Updated mysql wrapper for updating node info to accept bool or number

Server/utilities/mysqlHandler.js

@@ -68,6 +68,7 @@ exports.addNewNode = (nodeObject, callback) => {
  * @param callback Callback function
  */
 exports.updateNodeInfo = (nodeObject, callback) => {
+    if(!nodeObject.id) throw new Error("Attempted to updated node without providing ID", nodeObject);
     const name = nodeObject.name,
         ip = nodeObject.ip,
         port = nodeObject.port,
@@ -84,8 +85,8 @@ exports.updateNodeInfo = (nodeObject, callback) => {
         nearbySystems = utils.JsonToBuffer(nearbySystems)
         queryParams.push(`nearbySystems = '${nearbySystems}'`);
     }
-    if (typeof online === "boolean") {
-        if (online) queryParams.push(`online = 1`);
+    if (typeof online === "boolean" || typeof online === "number") {
+        if (online || online === 1) queryParams.push(`online = 1`);
         else queryParams.push(`online = 0`);
     }