Move app graphs graphite query to backend

src/routes/graphs.js

@@ -1,12 +1,17 @@
 'use strict';
 
 exports = module.exports = {
-    getGraphs
+    getGraphs,
+    getAppGraphs
 };
 
-const middleware = require('../middleware/index.js'),
+const assert = require('assert'),
+    graphs = require('../graphs.js'),
+    safe = require('safetydance'),
+    middleware = require('../middleware/index.js'),
+    url = require('url'),
     HttpError = require('connect-lastmile').HttpError,
-    url = require('url');
+    HttpSuccess = require('connect-lastmile').HttpSuccess;
 
 // for testing locally: curl 'http://127.0.0.1:8417/graphite-web/render?format=json&from=-1min&target=absolute(collectd.localhost.du-docker.capacity-usage)'
 // the datapoint is (value, timestamp) https://buildmedia.readthedocs.org/media/pdf/graphite/0.9.16/graphite.pdf
@@ -36,3 +41,15 @@ function getGraphs(req, res, next) {
     });
 }
 
+async function getAppGraphs(req, res, next) {
+    assert.strictEqual(typeof req.app, 'object');
+
+    if (!req.query.fromMinutes || !parseInt(req.query.fromMinutes)) return next(new HttpError(400, 'fromMinutes must be a number'));
+
+    const fromMinutes = parseInt(req.query.fromMinutes) || 60;
+    const noNullPoints = !!req.query.noNullPoints;
+    const [error, result] = await safe(graphs.getByAppId(req.app.id, fromMinutes, noNullPoints));
+    if (error) return next(new HttpError(500, error));
+
+    next(new HttpSuccess(200, result));
+}