Merge branch 'mtanda-cloudwatch_expand_template'

CHANGELOG.md

@@ -12,6 +12,7 @@
 * **Graphite**: Add support for groupByNode, closes [#5613](https://github.com/grafana/grafana/pull/5613)
 * **Influxdb**: Add support for elapsed(), closes [#5827](https://github.com/grafana/grafana/pull/5827)
 * **OAuth**: Add support for generic oauth, closes [#4718](https://github.com/grafana/grafana/pull/4718)
+* **Cloudwatch**: Add support to expand multi select template variable, closes [#5003](https://github.com/grafana/grafana/pull/5003)
 
 ### Breaking changes
 * **SystemD**: Change systemd description, closes [#5971](https://github.com/grafana/grafana/pull/5971)

docs/sources/installation/configuration.md

@@ -428,7 +428,7 @@ session provider you have configured.
 - **mysql:** go-sql-driver/mysql dsn config string, e.g. `user:password@tcp(127.0.0.1:3306)/database_name`
 - **postgres:** ex:  user=a password=b host=localhost port=5432 dbname=c sslmode=disable
 - **memcache:** ex:  127.0.0.1:11211
-- **redis:** ex: `addr=127.0.0.1:6379,pool_size=100,db=grafana`
+- **redis:** ex: `addr=127.0.0.1:6379,pool_size=100,prefix=grafana`
 
 If you use MySQL or Postgres as the session store you need to create the
 session table manually.

public/app/plugins/datasource/cloudwatch/datasource.js

@@ -23,6 +23,7 @@ function (angular, _, moment, dateMath, CloudWatchAnnotationQuery) {
 
       var queries = [];
       options = angular.copy(options);
+      options.targets = this.expandTemplateVariable(options.targets, templateSrv);
       _.each(options.targets, function(target) {
         if (target.hide || !target.namespace || !target.metricName || _.isEmpty(target.statistics)) {
           return;
@@ -337,6 +338,37 @@ function (angular, _, moment, dateMath, CloudWatchAnnotationQuery) {
       });
     }
 
+    this.getExpandedVariables = function(target, dimensionKey, variable) {
+      return _.chain(variable.options)
+      .filter(function(v) {
+        return v.selected;
+      })
+      .map(function(v) {
+        var t = angular.copy(target);
+        t.dimensions[dimensionKey] = v.value;
+        return t;
+      }).value();
+    };
+
+    this.expandTemplateVariable = function(targets, templateSrv) {
+      var self = this;
+      return _.chain(targets)
+      .map(function(target) {
+        var dimensionKey = _.findKey(target.dimensions, function(v) {
+          return templateSrv.variableExists(v);
+        });
+
+        if (dimensionKey) {
+          var variable = _.find(templateSrv.variables, function(variable) {
+            return templateSrv.containsVariable(target.dimensions[dimensionKey], variable.name);
+          });
+          return self.getExpandedVariables(target, dimensionKey, variable);
+        } else {
+          return [target];
+        }
+      }).flatten().value();
+    };
+
     this.convertToCloudWatchTime = function(date, roundUp) {
       if (_.isString(date)) {
         date = dateMath.parse(date, roundUp);

public/app/plugins/datasource/cloudwatch/specs/datasource_specs.ts

@@ -98,6 +98,38 @@ describe('CloudWatchDatasource', function() {
       });
       ctx.$rootScope.$apply();
     });
+
+    it('should generate the correct targets by expanding template variables', function() {
+      var templateSrv = {
+        variables: [
+          {
+            name: 'instance_id',
+            options: [
+              { value: 'i-23456789', selected: false },
+              { value: 'i-34567890', selected: true }
+            ]
+          }
+        ],
+        variableExists: function (e) { return true; },
+        containsVariable: function (str, variableName) { return str.indexOf('$' + variableName) !== -1; }
+      };
+
+      var targets = [
+        {
+          region: 'us-east-1',
+          namespace: 'AWS/EC2',
+          metricName: 'CPUUtilization',
+          dimensions: {
+            InstanceId: '$instance_id'
+          },
+          statistics: ['Average'],
+          period: 300
+        }
+      ];
+
+      var result = ctx.ds.expandTemplateVariable(targets, templateSrv);
+      expect(result[0].dimensions.InstanceId).to.be('i-34567890');
+    });
   });
 
   function describeMetricFindQuery(query, func) {