Hotfix for "Hastic instance name #558":

- serialize alerts in sendWebhook()

server/src/services/notification_service.ts

@@ -1,4 +1,3 @@
-import { Segment } from '../models/segment_model';
 import * as AnalyticUnit from '../models/analytic_unit_model';
 import { HASTIC_WEBHOOK_URL, HASTIC_WEBHOOK_TYPE, HASTIC_WEBHOOK_SECRET, HASTIC_INSTANCE_NAME } from '../config';
 
@@ -43,39 +42,39 @@ export async function sendAnalyticWebhook(alert: AnalyticAlert) {
   const toTime = new Date(alert.to).toLocaleTimeString();
   console.log(`Sending alert unit: ${alert.analyticUnitName} from: ${fromTime} to: ${toTime}`);
 
-  let payload;
-  if(HASTIC_WEBHOOK_TYPE === ContentType.JSON) {
-    payload = JSON.stringify(alert);
-  } else if(HASTIC_WEBHOOK_TYPE === ContentType.URLENCODED) {
-    payload = querystring.stringify(alert);
-  } else {
-    throw new Error(`Unknown webhook type: ${HASTIC_WEBHOOK_TYPE}`);
-  }
-  sendWebhook(payload);
+  sendWebhook(alert);
 }
 
 export async function sendInfoWebhook(alert: InfoAlert) {
   if(alert && typeof alert === 'object') {
     console.log(`Sending info webhook ${JSON.stringify(alert.message)}`);
-    sendWebhook(alert, ContentType.JSON);
+    sendWebhook(alert);
   } else {
     console.error(`skip sending Info webhook, got corrupted message ${alert}`);
   }
 }
 
-export async function sendWebhook(payload: any, contentType = HASTIC_WEBHOOK_TYPE) {
+export async function sendWebhook(payload: any) {
   if(HASTIC_WEBHOOK_URL === null) {
     throw new Error(`Can't send alert, HASTIC_WEBHOOK_URL is undefined`);
   }
 
   payload.instanceName = HASTIC_INSTANCE_NAME;
 
+  if(HASTIC_WEBHOOK_TYPE === ContentType.JSON) {
+    payload = JSON.stringify(alert);
+  } else if(HASTIC_WEBHOOK_TYPE === ContentType.URLENCODED) {
+    payload = querystring.stringify(alert);
+  } else {
+    throw new Error(`Unknown webhook type: ${HASTIC_WEBHOOK_TYPE}`);
+  }
+
   // TODO: use HASTIC_WEBHOOK_SECRET
   const options = {
     method: 'POST',
     url: HASTIC_WEBHOOK_URL,
     data: payload,
-    headers: { 'Content-Type': contentType }
+    headers: { 'Content-Type': HASTIC_WEBHOOK_TYPE }
   };
 
   try {