feat(influxdb): escape influxdb tag values, fixes #3950

public/app/plugins/datasource/influxdb/influx_query.ts

@@ -6,8 +6,8 @@ import queryPart from './query_part';
 export default class InfluxQuery {
   target: any;
   selectModels: any[];
-  groupByParts: any;
   queryBuilder: any;
+  groupByParts: any;
 
   constructor(target) {
     this.target = target;
@@ -144,7 +144,7 @@ export default class InfluxQuery {
 
     // quote value unless regex
     if (operator !== '=~' && operator !== '!~') {
-      value = "'" + value + "'";
+      value = "'" + value.replace('\\', '\\\\') + "'";
     }
 
     return str + '"' + tag.key + '" ' + operator + ' ' + value;

public/app/plugins/datasource/influxdb/specs/influx_query_specs.ts

@@ -51,12 +51,12 @@ describe('InfluxQuery', function() {
       var query = new InfluxQuery({
         measurement: 'cpu',
         groupBy: [{type: 'time', params: ['auto']}],
-        tags: [{key: 'hostname', value: 'server1'}]
+        tags: [{key: 'hostname', value: 'server\\1'}]
       });
 
       var queryText = query.render();
 
-      expect(queryText).to.be('SELECT mean("value") FROM "cpu" WHERE "hostname" = \'server1\' AND $timeFilter'
+      expect(queryText).to.be('SELECT mean("value") FROM "cpu" WHERE "hostname" = \'server\\\\1\' AND $timeFilter'
                           + ' GROUP BY time($interval)');
     });