support for backend jobs and other script API changes

src/services/script.js

@@ -18,7 +18,40 @@ async function executeScript(dataKey, script, params) {
     return ret;
 }
 
+const timeouts = {};
+const intervals = {};
+
+function clearExistingJob(name) {
+    if (timeouts[name]) {
+        clearTimeout(timeouts[name]);
+
+        delete timeouts[name];
+    }
+
+    if (intervals[name]) {
+        clearInterval(intervals[name]);
+
+        delete intervals[name];
+    }
+}
+
+async function setJob(opts) {
+    clearExistingJob(opts.name);
+
+    if (opts.runEveryMs && opts.runEveryMs > 0) {
+        intervals[opts.name] = setInterval(() => executeScript(null, opts.job, opts.params), opts.runEveryMs);
+    }
+
+    if (opts.initialRunAfterMs && opts.initialRunAfterMs > 0) {
+        timeouts[opts.name] = setTimeout(() => executeScript(null, opts.job, opts.params), opts.initialRunAfterMs);
+    }
+}
+
 function getParams(params) {
+    if (!params) {
+        return params;
+    }
+
     return params.map(p => {
         if (typeof p === "string" && p.startsWith("!@#Function: ")) {
             return p.substr(13);
@@ -30,5 +63,6 @@ function getParams(params) {
 }
 
 module.exports = {
-    executeScript
+    executeScript,
+    setJob
 };