Support multiple panels export at once (#32)

src/routes/tasks.ts

@@ -1,26 +1,42 @@
 import { Target } from '../target'
 
 import * as express from 'express'
+import { Datasource } from '@corpglory/tsdb-kit';
 
+type TRequest = {
+  body: {
+    from: string,
+    to: string,
+    data: Array<{
+      panelUrl: string,
+      datasourceRequest: Datasource,
+      datasourceName: string
+    }>,
+    target: object,
+    user: string,
+  }
+};
 
-async function addTask(req, res) {
-  let body = req.body;
-  let from = parseInt(body.from);
-  let to = parseInt(body.to);
-  let panelUrl = body.panelUrl;
-  let targets = [body.target];
-  let datasource = body.datasourceRequest;
-  let datasourceName = body.datasourceName;
-  let user = body.user;
+async function addTask(req: TRequest, res) {
+  const body = req.body;
+  const from = parseInt(body.from);
+  const to = parseInt(body.to);
+  const data = body.data;
+  const targets = [body.target];
+  const user = body.user;
 
   if(isNaN(from) || isNaN(to)) {
-    res.status(500).send('Range error: please fill both "from" and "to" fields');
+    res.status(400).send('Range error: please fill both "from" and "to" fields');
   } else if(from >= to) {
-    res.status(500).send('Range error: "from" should be less than "to"');
+    res.status(400).send('Range error: "from" should be less than "to"');
   } else {
-    res.status(200).send('Exporting ' + datasourceName + ' data from ' + new Date(from).toLocaleString() + ' to ' + new Date(to).toLocaleString());
-    let target = new Target(panelUrl, user, datasource, targets, from, to, datasourceName);
+    const names = data.map(item => item.datasourceName).join(', ');
+    res.status(200).send(`Exporting ${names} data from ${new Date(from).toLocaleString()} to ${new Date(to).toLocaleString()}`);
+
+    data.forEach(request => {
+      const target = new Target(request.panelUrl, user, request.datasourceRequest, targets, from, to, request.datasourceName);
       target.export();
+    });
   }
 }