Added method for getting history from cache.

plugins/datasource-zabbix/datasource.js

@@ -140,7 +140,7 @@ function (angular, _, dateMath, utils, metricFunctions) {
                 } else {
 
                   // Use history
-                  getHistory = self.zabbixAPI.getHistory(items, from, to).then(function(history) {
+                  getHistory = self.zabbixCache.getHistory(items, from, to).then(function(history) {
                     return self.queryProcessor.handleHistory(history, addHostName);
                   });
                 }

plugins/datasource-zabbix/zabbixCache.js

@@ -21,6 +21,10 @@ function (angular, _, utils) {
       this._hosts         = undefined;
       this._applications  = undefined;
       this._items         = undefined;
+      this.storage = {
+        history: {},
+        trends: {}
+      };
 
       // Check is a service initialized or not
       this._initialized = undefined;
@@ -115,6 +119,48 @@ function (angular, _, utils) {
       }
     }
 
+    p.getHistory = function(items, time_from, time_till) {
+      var itemids = _.map(arguments[0], 'itemid');
+      var stamp = itemids.join() + arguments[1] + arguments[2];
+      //console.log(arguments, stamp);
+      return this.zabbixAPI.getHistory(items, time_from, time_till);
+    };
+
+    p.getHistory_ = function(items, time_from, time_till) {
+      var deferred  = $q.defer();
+      var historyStorage = this.storage.history;
+      var full_history;
+      var expired = _.filter(_.indexBy(items, 'itemid'), function(item, itemid) {
+        return !historyStorage[itemid];
+      });
+      if (expired.length) {
+        this.zabbixAPI.getHistory(expired, time_from, time_till).then(function(history) {
+          var grouped_history = _.groupBy(history, 'itemid');
+          _.forEach(expired, function(item) {
+            var itemid = item.itemid;
+            historyStorage[itemid] = item;
+            historyStorage[itemid].time_from = time_from;
+            historyStorage[itemid].time_till = time_till;
+            historyStorage[itemid].history = grouped_history[itemid];
+          });
+          full_history = _.map(items, function(item) {
+            return historyStorage[item.itemid].history;
+          });
+          deferred.resolve(_.flatten(full_history, true));
+        });
+      } else {
+        full_history = _.map(items, function(item) {
+          return historyStorage[item.itemid].history;
+        });
+        deferred.resolve(_.flatten(full_history, true));
+      }
+      return deferred.promise;
+    };
+
+    p.getHistoryFromAPI = function(items, time_from, time_till) {
+      return this.zabbixAPI.getHistory(items, time_from, time_till);
+    };
+
     p.getHost = function(hostid) {
       return _.find(this._hosts, {'hostid': hostid});
     };