Connection alerts are displayed for each panel #374 (#379)

src/datasource/config_ctrl.ts

@@ -1,4 +1,4 @@
-import { normalizeUrl } from '../utlis';
+import { normalizeUrl } from '../utils';
 import configTemplate from './partials/config.html';
 
 

src/datasource/hastic_api.ts

@@ -1,4 +1,4 @@
-import { isHasticServerResponse, isSupportedServerVersion, SUPPORTED_SERVER_VERSION } from '../utlis';
+import { isHasticServerResponse, isSupportedServerVersion, SUPPORTED_SERVER_VERSION } from '../utils';
 
 import { BackendSrv } from 'grafana/app/core/services/backend_srv';
 

src/panel/graph_panel/graph_ctrl.ts

@@ -12,7 +12,6 @@ import { BOUND_TYPES } from './models/analytic_units/anomaly_analytic_unit';
 import { AnalyticService } from './services/analytic_service';
 import { AnalyticController } from './controllers/analytic_controller';
 import { HasticPanelInfo } from './models/hastic_panel_info';
-
 import { axesEditorComponent } from './axes_editor';
 
 import { MetricsPanelCtrl } from 'grafana/app/plugins/sdk';
@@ -241,25 +240,6 @@ class GraphCtrl extends MetricsPanelCtrl {
     return _.keys(this._analyticUnitTypes);
   }
 
-  async runDatasourceConnectivityCheck() {
-    try {
-      const connected = await this.analyticService.isDatasourceOk();
-      if(connected) {
-        this.updateAnalyticUnitTypes();
-        appEvents.emit(
-          'alert-success',
-          [
-            'Connected to Hastic Datasource',
-            `Hastic datasource URL: "${this.analyticService.hasticDatasourceURL}"`
-          ]
-        );
-      }
-    }
-    catch(err) {
-      console.error(err);
-    }
-  }
-
   async link(scope, elem, attrs, ctrl) {
     this.$graphElem = $(elem[0]).find('#graphPanel');
     this.$legendElem = $(elem[0]).find('#graphLegend');
@@ -293,6 +273,12 @@ class GraphCtrl extends MetricsPanelCtrl {
         type: undefined
       };
     });
+
+    appEvents.on('hastic-datasource-status-changed', (url: string) => {
+      if(url === this.analyticService.hasticDatasourceURL) {
+        this.refresh();
+      }
+    });
   }
 
   onInitEditMode() {
@@ -323,7 +309,10 @@ class GraphCtrl extends MetricsPanelCtrl {
       delete this.analyticService;
     } else {
       this.analyticService = new AnalyticService(hasticDatasource.url, this.$http);
-      this.runDatasourceConnectivityCheck();
+      const isDatasourceAvailable = await this.analyticService.isDatasourceAvailable();
+      if(isDatasourceAvailable) {
+        this.updateAnalyticUnitTypes();
+      }
     }
 
     this.analyticsController = new AnalyticController(this._grafanaUrl, this._panelId, this.panel, this.events, this.analyticService);

src/panel/graph_panel/services/analytic_service.ts

@@ -6,18 +6,33 @@ import { AnalyticUnitId, AnalyticUnit, AnalyticSegment } from '../models/analyti
 import { HasticServerInfo, HasticServerInfoUnknown } from '../models/hastic_server_info';
 import { DetectionSpan } from '../models/detection';
 
-import { isHasticServerResponse, isSupportedServerVersion, SUPPORTED_SERVER_VERSION } from '../../../utlis';
+import { isHasticServerResponse, isSupportedServerVersion, SUPPORTED_SERVER_VERSION } from '../../../utils';
 
 import { appEvents } from 'grafana/app/core/core';
 
 import * as _ from 'lodash';
 
+
+declare global {
+  interface Window { hasticDatasourcesStatuses: { [key: string]: HasticDatasourceStatus } }
+}
+
 // TODO: TableTimeSeries is bad name
 export type TableTimeSeries = {
   values: [number, number][];
   columns: string[];
 };
 
+export enum HasticDatasourceStatus {
+  AVAILABLE,
+  NOT_AVAILABLE
+};
+
+const STATUS_TO_ALERT_TYPE_MAPPING = new Map<HasticDatasourceStatus, string>([
+  [HasticDatasourceStatus.AVAILABLE, 'alert-success'],
+  [HasticDatasourceStatus.NOT_AVAILABLE, 'alert-error']
+]);
+
 export class AnalyticService {
   private _isUp: boolean = false;
 
@@ -81,7 +96,7 @@ export class AnalyticService {
     return this.delete('/analyticUnits', { id });
   }
 
-  async isDatasourceOk(): Promise<boolean> {
+  private async _isDatasourceOk(): Promise<boolean> {
     if(!this._checkDatasourceConfig()) {
       this._isUp = false;
       return false;
@@ -224,6 +239,19 @@ export class AnalyticService {
     });
   }
 
+  async isDatasourceAvailable(): Promise<boolean> {
+    const connected = await this._isDatasourceOk();
+    if(!connected) {
+      return false;
+    }
+    const message = [
+      'Connected to Hastic Datasource',
+      `Hastic datasource URL: "${this._hasticDatasourceURL}"`
+    ];
+    this._displayConnectionAlert(HasticDatasourceStatus.AVAILABLE, message);
+    return true;
+  }
+
   async updateAnalyticUnit(updateObj: any) {
     return this.patch('/analyticUnits', updateObj);
   }
@@ -296,38 +324,66 @@ export class AnalyticService {
   }
 
   private displayConnectionErrorAlert() {
-    appEvents.emit(
-      'alert-error',
-      [
+    const message = [
       'Timeout when connecting to Hastic Server',
       `Hastic Datasource URL: "${this._hasticDatasourceURL}"`,
     ]
-    );
+    this._displayConnectionAlert(HasticDatasourceStatus.NOT_AVAILABLE, message);
   }
 
   private displayWrongUrlAlert() {
-    appEvents.emit(
-      'alert-error',
-      [
+    const message = [
       'Please check Hastic Server URL',
       `Something is working at "${this._hasticDatasourceURL}" but it's not Hastic Server`,
     ]
-    );
+    this._displayConnectionAlert(HasticDatasourceStatus.NOT_AVAILABLE, message);
   }
 
   private displayUnsupportedVersionAlert(actual: string) {
-    appEvents.emit(
-      'alert-error',
-      [
+    const message = [
       'Unsupported Hastic Server version',
       `Hastic Server at "${this._hasticDatasourceURL}" has unsupported version (got ${actual}, should be ${SUPPORTED_SERVER_VERSION})`,
     ]
-    );
+    this._displayConnectionAlert(HasticDatasourceStatus.NOT_AVAILABLE, message);
   }
 
   public get isUp(): boolean {
     return this._isUp;
   }
+
+  private _displayConnectionAlert(status: HasticDatasourceStatus, message: string[]) {
+    const statusChanged = this._updateHasticUrlStatus(status);
+
+    if(!statusChanged) {
+      return;
+    }
+
+    appEvents.emit(
+      STATUS_TO_ALERT_TYPE_MAPPING.get(status),
+      message
+    );
+  }
+
+  /**
+   * Updates hastic datasource status
+   * @returns true if status has been changed
+   */
+  private _updateHasticUrlStatus(status: HasticDatasourceStatus): boolean {
+    if(!window.hasOwnProperty('hasticDatasourcesStatuses')) {
+      window.hasticDatasourcesStatuses = {};
+    }
+    if(!window.hasticDatasourcesStatuses.hasOwnProperty(this._hasticDatasourceURL)) {
+      window.hasticDatasourcesStatuses[this._hasticDatasourceURL] = status;
+      return true;
+    }
+    if(window.hasticDatasourcesStatuses[this._hasticDatasourceURL] !== status) {
+      appEvents.emit('hastic-datasource-status-changed', this._hasticDatasourceURL);
+      window.hasticDatasourcesStatuses[this._hasticDatasourceURL] = status;
+      return true;
+    }
+    return false;
+  }
+
 }
 
 async function *getGenerator<T>(

tests/utils.jest.ts

@@ -1,4 +1,4 @@
-import { normalizeUrl } from '../src/utlis';
+import { normalizeUrl } from '../src/utils';
 
 describe('Normalize URL', function() {
   const cases = [