settings: add CSV_STORAGE_SIZE

* Added setting CSV_STORAGE_SIZE to limit the size of the CSV storage.

backend/routes.js

@@ -1,9 +1,11 @@
 var restify = require('restify');
 var CookieParser = require('restify-cookies');
-import * as Datastores from './persistent/datastores/Datastores.js';
 import * as fs from 'fs';
 import path from 'path';
 
+import * as Datastores from './persistent/datastores/Datastores.js';
+const setSizeCSVStorage = require('./persistent/datastores/csv.js').setSize
+
 import {PlotlyOAuth} from './plugins/authorization.js';
 import {getQueries, getQuery, deleteQuery} from './persistent/Queries';
 import {
@@ -34,6 +36,13 @@ export default class Servers {
      * The httpsServer starts when certificates have been created.
      */
     constructor(args = {createCerts: true, startHttps: true, isElectron: false}) {
+        try {
+            setSizeCSVStorage(getSetting('CSV_STORAGE_SIZE'));
+        } catch (error) {
+            Logger.log(`Failed to get setting CSV_STORAGE_SIZE: ${error.message}`);
+            setSizeCSVStorage(0);
+        }
+
         this.httpServer = {
             port: null,
             server: null,

backend/settings.js

@@ -36,6 +36,11 @@ const DEFAULT_SETTINGS = {
      */
     ADDITIONAL_CORS_ALLOWED_ORIGINS: [],
 
+    /*
+     * Storage size of CSV connector in bytes (0 to disable size limit)
+     */
+    CSV_STORAGE_SIZE: 0,
+
     DEFAULT_CORS_ALLOWED_ORIGINS: [
         'https://plot.ly',
         'https://stage.plot.ly',