Finalyze datasource

src/datasource/datasource.ts

@@ -1,16 +1,34 @@
+import HasticAPI from './hastic_api';
+
+import { BackendSrv } from 'grafana/app/core/services/backend_srv';
+
 export class HasticDatasource {
+  private hastic: HasticAPI;
 
   /** @ngInject */
-  constructor(public instanceSettings: any) {
+  constructor(instanceSettings: any, backendSrv: BackendSrv) {
-
+    this.hastic = new HasticAPI(instanceSettings, backendSrv);
   }
 
   async query(options: any) {
-
+    console.log(options);
   }
 
   async testDatasource() {
-
+    try {
+      await this.hastic.get('/');
+      // TODO: check if it is hastic
+      return {
+        status: 'success', title: 'Success',
+        message: 'Datasource is working'
+      };
+    } catch(err) {
+      console.error(err);
+      return {
+        status: 'error', title: 'Error',
+        message: 'Hastic connection error'
+      };
+    }
   }
 
   metricFindQuery(options: any) {

src/datasource/hastic_api.ts

@@ -0,0 +1,29 @@
+import { BackendSrv } from 'grafana/app/core/services/backend_srv';
+
+export default class HasticAPI {
+  private url: string;
+
+  constructor(instanceSettings: any, private backendSrv: BackendSrv) {
+    this.url = instanceSettings.url;
+  }
+
+  get(url: string, params?: any) {
+    return this._query('GET', url, params);
+  }
+
+  private async _query(method: string, url: string, data?: any) {
+    method = method.toUpperCase();
+    let options: any = {
+      method,
+      url: this.url + url
+    };
+    if(method === 'GET' || method === 'DELETE') {
+      options.params = data;
+    } else {
+      options.data = data;
+    }
+
+    const response = await this.backendSrv.datasourceRequest(options);
+    return response.data;
+  }
+}