changed feature flag service to a singleton (#407)

Author: just-at-uber

client/components/feature-flag.vue

@@ -20,7 +20,7 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 // THE SOFTWARE.
 
-import { FeatureFlagService } from '~services';
+import { featureFlagService } from '~services';
 
 export default {
   name: 'feature-flag',
@@ -58,7 +58,6 @@ export default {
   },
   async mounted() {
     const { name, params } = this;
-    const featureFlagService = new FeatureFlagService();
 
     this.isFeatureFlagEnabled = await featureFlagService.isFeatureFlagEnabled({
       name,

client/routes/workflow/summary.vue

@@ -24,7 +24,7 @@ import { TERMINATE_DEFAULT_ERROR_MESSAGE } from './constants';
 import { NOTIFICATION_TYPE_ERROR, NOTIFICATION_TYPE_SUCCESS } from '~constants';
 import { getErrorMessage, getDatetimeFormattedString } from '~helpers';
 import { BarLoader, ButtonFill, DataViewer, DetailList } from '~components';
-import { FeatureFlagService, httpService } from '~services';
+import { featureFlagService, httpService } from '~services';
 
 export default {
   data() {
@@ -56,8 +56,7 @@ export default {
     'detail-list': DetailList,
   },
   async mounted() {
-    this.featureFlagService = new FeatureFlagService();
-    this.isWorkflowTerminateFeatureFlagEnabled = await this.featureFlagService.isFeatureFlagEnabled(
+    this.isWorkflowTerminateFeatureFlagEnabled = await featureFlagService.isFeatureFlagEnabled(
       { name: 'workflowTerminate' }
     );
     this.initAuthorization();
@@ -117,7 +116,7 @@ export default {
       }
     },
     async initAuthorization() {
-      const isDomainAuthorizationFeatureFlagEnabled = await this.featureFlagService.isFeatureFlagEnabled(
+      const isDomainAuthorizationFeatureFlagEnabled = await featureFlagService.isFeatureFlagEnabled(
         { name: 'domainAuthorization' }
       );
 

client/services/feature-flag-service.js

@@ -31,6 +31,12 @@ class FeatureFlagService {
 
     return (await httpService.get(url)).value;
   }
+
+  getConfiguration(args) {
+    return this.isFeatureFlagEnabled(args);
+  }
 }
 
-export default FeatureFlagService;
+const featureFlagService = new FeatureFlagService();
+
+export default featureFlagService;

client/services/index.js

@@ -19,5 +19,5 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 // THE SOFTWARE.
 
-export { default as FeatureFlagService } from './feature-flag-service';
+export { default as featureFlagService } from './feature-flag-service';
 export { default as httpService } from './http-service';