stackdriver: add resource types query

public/app/plugins/datasource/stackdriver/StackdriverMetricFindQuery.ts

@@ -13,6 +13,8 @@ export default class StackdriverMetricFindQuery {
       case 'metricLabels':
       case 'resourceLabels':
         return this.handleLabelQueryType(query);
+      case 'resourceTypes':
+        return this.handleResourceType(query);
       default:
         return [];
     }
@@ -40,11 +42,23 @@ export default class StackdriverMetricFindQuery {
     }));
   }
 
-  async handleLabelQueryType({ type, metricType, metricLabelKey, resourceLabelKey }) {
+  getLabelKey({ type, metricLabelKey, resourceLabelKey }) {
+    switch (type) {
+      case 'metricLabels':
+        return metricLabelKey;
+        break;
+      case 'resourceLabels':
+        return resourceLabelKey;
+      default:
+        return '';
+    }
+  }
+
+  async handleLabelQueryType({ type, metricType, metricLabelKey, resourceLabelKey, resourceTypeKey }) {
     if (!metricType) {
       return [];
     }
-    const key = type === 'metricLabels' ? metricLabelKey : resourceLabelKey;
+    const key = this.getLabelKey({ type, metricLabelKey, resourceLabelKey });
     const refId = 'handleLabelsQueryType';
     const response = await this.datasource.getLabels(metricType, refId);
     if (!has(response, `meta.${type}.${key}`)) {
@@ -55,4 +69,20 @@ export default class StackdriverMetricFindQuery {
       expandable: true,
     }));
   }
+
+  async handleResourceType({ metricType }) {
+    if (!metricType) {
+      return [];
+    }
+    try {
+      const refId = 'handleResourceTypeQueryType';
+      const response = await this.datasource.getLabels(metricType, refId);
+      return response.meta.resourceTypes.map(s => ({
+        text: s,
+        expandable: true,
+      }));
+    } catch (error) {
+      return [];
+    }
+  }
 }

public/app/plugins/datasource/stackdriver/components/TemplateQueryComponent.tsx

@@ -44,6 +44,10 @@ export class StackdriverTemplateQueryComponent extends PureComponent<TemplateQue
     this.setState({ metricDescriptors });
   }
 
+  isLabelQuery(queryType) {
+    return ['metricLabels', 'resourceLabels'].indexOf(queryType) !== -1;
+  }
+
   async loadTimeSeriesData() {
     const refId = 'StackdriverTemplateQueryComponent';
     const response = await this.props.datasource.getLabels(this.state.metricType, refId);
@@ -52,10 +56,6 @@ export class StackdriverTemplateQueryComponent extends PureComponent<TemplateQue
     }
   }
 
-  isLabelQuery(queryType) {
-    return ['metricLabels', 'resourceLabels'].indexOf(queryType) !== -1;
-  }
-
   handleQueryTypeChange(event) {
     this.setState({ type: event.target.value });
     if (this.isLabelQuery(event.target.value)) {
@@ -87,6 +87,31 @@ export class StackdriverTemplateQueryComponent extends PureComponent<TemplateQue
     this.props.onChange(queryModel);
   }
 
+  switchMetaType(queryType) {
+    switch (queryType) {
+      case 'resourceLabels':
+        return (
+          <SimpleDropdown
+            value={this.state.resourceLabelKey}
+            options={this.state.resourceLabels}
+            onValueChange={this.onResourceLabelKeyChange}
+            label="Resource Labels"
+          />
+        );
+      case 'metricLabels':
+        return (
+          <SimpleDropdown
+            value={this.state.metricLabelKey}
+            options={this.state.metricLabels}
+            onValueChange={this.onMetricLabelKeyChange}
+            label="Metric Labels"
+          />
+        );
+      default:
+        return '';
+    }
+  }
+
   renderSwitch(queryType) {
     switch (queryType) {
       case 'metricTypes':
@@ -95,22 +120,8 @@ export class StackdriverTemplateQueryComponent extends PureComponent<TemplateQue
         );
       case 'metricLabels':
       case 'resourceLabels':
-        const dropdown =
+      case 'resourceTypes':
-          queryType === 'resourceLabels' ? (
+        const dropdown = this.switchMetaType(queryType);
-            <SimpleDropdown
-              value={this.state.resourceLabelKey}
-              options={this.state.resourceLabels}
-              onValueChange={this.onResourceLabelKeyChange}
-              label="Resource Labels"
-            />
-          ) : (
-            <SimpleDropdown
-              value={this.state.metricLabelKey}
-              options={this.state.metricLabels}
-              onValueChange={this.onMetricLabelKeyChange}
-              label="Metric Labels"
-            />
-          );
         return (
           <React.Fragment>
             <ServiceSelector metricDescriptors={this.state.metricDescriptors} onServiceChange={this.onServiceChange} />