wip: error handling

src/services/exporter.ts

@@ -22,6 +22,8 @@ export class Exporter {
   private createdTimestamp: number;
   private username: string;
   private datasourceRef: DataSourceRef;
+  private from: number;
+  private to: number;
 
   private initCsvStream() {
     const csvStream = csv.createWriteStream({ headers: true })
@@ -38,16 +40,19 @@ export class Exporter {
     return csvStream;
   }
 
-  public async updateStatus(status: string, progress: number) {
+  public async updateStatus(status: string, progress: number, error?: string) {
     try {
       let time = moment().valueOf();
       let data = {
         time,
+        progress,
+        status,
+        error,
         username: this.username,
         exportedRows: this.exportedRows,
-        progress: progress,
-        status,
         datasourceRef: this.datasourceRef,
+        from: this.from,
+        to: this.to,
       };
 
       await promisify(fs.writeFile, this.getFilePath('json'), JSON.stringify(data), 'utf8')
@@ -60,6 +65,8 @@ export class Exporter {
   // TODO: rename `data` to `targets` or `queries`
   public async export(data: Target[], datasourceUrl: string, username: string, from: number, to: number) {
     this.username = username;
+    this.from = from;
+    this.to = to;
 
     this.validateTargets(datasourceUrl, data);
 
@@ -103,10 +110,15 @@ export class Exporter {
         const host = new URL(datasourceUrl).origin;
         const apiKey = apiKeys[host];
 
-        const datasourceMetrics = await queryByConfig(target.metric, datasourceUrl, from, to, apiKey);
+        try {
+          const datasourceMetrics = await queryByConfig(target.metric, datasourceUrl, from, to, apiKey);
 
-        columns = datasourceMetrics.columns;
-        values = datasourceMetrics.values;
+          columns = datasourceMetrics.columns;
+          values = datasourceMetrics.values;
+        } catch (e) {
+          await this.updateStatus(ExportStatus.ERROR, (day + 1) / days, e.message);
+          break;
+        }
       }
 
       if(columns.length > 0) {

src/types/export-status.ts

@@ -1,4 +1,5 @@
 export enum ExportStatus {
   EXPORTING = 'exporting',
   FINISHED = 'finished',
+  ERROR = 'error',
 }