Error message in GET /anomalies/status

REST.md

@@ -32,7 +32,8 @@ Return data format:
 
 ```
 {
-  "status": <str>
+  "status": <str>,
+  "errorMessage": <str>
 }
 ```
 

server/src/routes/anomalies.ts

@@ -30,7 +30,7 @@ async function sendAnomalyTypeStatus(req, res) {
     if(anomaly.status === undefined) {
       throw new Error('No status for ' + name);
     }
-    res.status(200).send({ status: anomaly.status });
+    res.status(200).send({ status: anomaly.status, errorMessage: anomaly.error });
   } catch(e) {
     console.error(e);
     // TODO: better send 404 when we know than isn`t found

server/src/services/analytics.ts

@@ -89,7 +89,7 @@ async function runLearning(anomalyId:AnomalyId) {
     insertSegments(anomalyId, result.segments, false);
     setAnomalyPredictionTime(anomalyId, result.last_prediction_time);
   } else {
-    setAnomalyStatus(anomalyId, 'failed');
+    setAnomalyStatus(anomalyId, 'failed', result.error);
   }
 }
 

server/src/services/anomalyType.ts

@@ -25,6 +25,7 @@ export type Anomaly = {
   metric: Metric,
   datasource: Datasource
   status: string,
+  error?: string,
 
   last_prediction_time: number,
   next_id: number
@@ -108,9 +109,14 @@ function getAnomalyTypeInfo(name) {
   return getJsonDataSync(path.join(ANOMALIES_PATH, `${name}.json`));
 }
 
-function setAnomalyStatus(anomalyId:AnomalyId, status:string) {
+function setAnomalyStatus(anomalyId:AnomalyId, status:string, error?:string) {
   let info = loadAnomalyById(anomalyId);
   info.status = status;
+  if(error !== undefined) {
+    info.error = error;
+  } else {
+    info.error = '';
+  }
   saveAnomaly(anomalyId, info);
 }