Add suggest_tagk() and suggest_tagv() to OpenTSDB datasource (#2840)

docs/sources/datasources/opentsdb.md

@@ -40,8 +40,10 @@ Grafana's OpenTSDB data source now supports template variable values queries. Th
 
 When using OpenTSDB with a template variable of `query` type you can use following syntax for lookup.
 
-    metrics()                     // returns metric names
+    metrics(prefix)               // returns metric names with specific prefix (can be empty)
     tag_names(cpu)                // return tag names (i.e. keys) for a specific cpu metric
     tag_values(cpu, hostname)     // return tag values for metric cpu and tag key hostname
+    suggest_tagk(prefix)          // return tag names (i.e. keys) for all metrics with specific prefix (can be empty)
+    suggest_tagv(prefix)          // return tag values for all metrics with specific prefix (can be empty)
 
-For details on opentsdb metric queries checkout the official [OpenTSDB documentation](http://opentsdb.net/docs/build/html/index.html)
+For details on opentsdb metric queries checkout the official [OpenTSDB documentation](http://opentsdb.net/docs/build/html/index.html)

public/app/plugins/datasource/opentsdb/datasource.js

@@ -80,8 +80,8 @@ function (angular, _, dateMath) {
       return backendSrv.datasourceRequest(options);
     };
 
-    OpenTSDBDatasource.prototype._performSuggestQuery = function(query) {
-      return this._get('/api/suggest', {type: 'metrics', q: query, max: 1000}).then(function(result) {
+    OpenTSDBDatasource.prototype._performSuggestQuery = function(query, type) {
+      return this._get('/api/suggest', {type: type, q: query, max: 1000}).then(function(result) {
         return result.data;
       });
     };
@@ -150,10 +150,12 @@ function (angular, _, dateMath) {
       var metrics_regex = /metrics\((.*)\)/;
       var tag_names_regex = /tag_names\((.*)\)/;
       var tag_values_regex = /tag_values\((.*),\s?(.*)\)/;
+      var tag_names_suggest_regex = /suggest_tagk\((.*)\)/;
+      var tag_values_suggest_regex = /suggest_tagv\((.*)\)/;
 
       var metrics_query = interpolated.match(metrics_regex);
       if (metrics_query) {
-        return this._performSuggestQuery(metrics_query[1]).then(responseTransform);
+        return this._performSuggestQuery(metrics_query[1], 'metrics').then(responseTransform);
       }
 
       var tag_names_query = interpolated.match(tag_names_regex);
@@ -166,7 +168,17 @@ function (angular, _, dateMath) {
         return this._performMetricKeyValueLookup(tag_values_query[1], tag_values_query[2]).then(responseTransform);
       }
 
-      return $q.when([]);
+      var tag_names_suggest_query = interpolated.match(tag_names_suggest_regex);
+      if (tag_names_suggest_query) {
+        return this._performSuggestQuery(tag_names_suggest_query[1], 'tagk').then(responseTransform);
+      }
+
+      var tag_values_suggest_query = interpolated.match(tag_values_suggest_regex);
+      if (tag_values_suggest_query) {
+        return this._performSuggestQuery(tag_values_suggest_query[1], 'tagv').then(responseTransform);
+      }
+
+      return $q.when([{text: "wtf"}]);
     };
 
     OpenTSDBDatasource.prototype.testDatasource = function() {

public/test/specs/opentsdbDatasource-specs.js

@@ -27,9 +27,11 @@ define([
       });
 
       it('metrics() should generate api suggest query', function() {
-        ctx.ds.metricFindQuery('metrics()').then(function(data) { results = data; });
+        ctx.ds.metricFindQuery('metrics(pew)').then(function(data) { results = data; });
         ctx.$rootScope.$apply();
         expect(requestOptions.url).to.be('/api/suggest');
+        expect(requestOptions.params.type).to.be('metrics');
+        expect(requestOptions.params.q).to.be('pew');
       });
 
       it('tag_names(cpu) should generate looku  query', function() {
@@ -46,6 +48,22 @@ define([
         expect(requestOptions.params.m).to.be('cpu{hostname=*}');
       });
 
+      it('suggest_tagk() should generate api suggest query', function() {
+        ctx.ds.metricFindQuery('suggest_tagk(foo)').then(function(data) { results = data; });
+        ctx.$rootScope.$apply();
+        expect(requestOptions.url).to.be('/api/suggest');
+        expect(requestOptions.params.type).to.be('tagk');
+        expect(requestOptions.params.q).to.be('foo');
+      });
+
+      it('suggest_tagv() should generate api suggest query', function() {
+        ctx.ds.metricFindQuery('suggest_tagv(bar)').then(function(data) { results = data; });
+        ctx.$rootScope.$apply();
+        expect(requestOptions.url).to.be('/api/suggest');
+        expect(requestOptions.params.type).to.be('tagv');
+        expect(requestOptions.params.q).to.be('bar');
+      });
+
     });
   });
 });