Cache service refactoring.

plugins/datasource-zabbix/utils.js

@@ -0,0 +1,32 @@
+define([
+  'angular',
+  'lodash'
+],
+function (angular, _) {
+  'use strict';
+
+  var module = angular.module('grafana.services');
+
+  module.service('Utils', function() {
+
+    /**
+     * Expand Zabbix item name
+     *
+     * @param  {string} name item name, ie "CPU $2 time"
+     * @param  {string} key  item key, ie system.cpu.util[,system,avg1]
+     * @return {string}      expanded name, ie "CPU system time"
+     */
+    this.expandItemName = function(name, key) {
+
+      // extract params from key:
+      // "system.cpu.util[,system,avg1]" --> ["", "system", "avg1"]
+      var key_params = key.substring(key.indexOf('[') + 1, key.lastIndexOf(']')).split(',');
+
+      // replace item parameters
+      for (var i = key_params.length; i >= 1; i--) {
+        name = name.replace('$' + i, key_params[i - 1]);
+      }
+      return name;
+    };
+  });
+});