Issue-58: Resilient to localStorage is null (#59)

* Issue-58: Resilient to localStorage is null.

cypress/e2e/functional/localStorage.js

@@ -0,0 +1,15 @@
+// Test for Convivial Profiler with no local storage.
+
+describe('No Local Storage: Test 01', () => {
+  it('1. Check no error is thrown if the localstorage is disabled.'
+      , () => {
+      cy.disableLocalStorage();
+        // Open the default page.
+      cy.visit(Cypress.env('baseUrl'));
+      cy.window()
+        .its('console')
+        .then((console) => {
+          cy.stub(console, 'error').throws('Console error')
+        })
+  })
+});

example/convivial-profiler-init.js

@@ -1,4 +1,4 @@
 (function (window, ConvivialProfiler, config) {
-  window.convivialProfiler = new ConvivialProfiler(config.config, config.site);
+  window.convivialProfiler = new ConvivialProfiler(config.config, config.site, config.license_key);
   window.convivialProfiler.collect();
 })(window, window.ConvivialProfiler.default, drupalSettings.convivialProfiler);

src/index.js

@@ -8,7 +8,7 @@
 import { accumulation, dimension, extreme_geoip, language_simple, language_full, map, pageview, searchquery, store, unstore_value, temp } from "./modules/processor"
 import { bestpick, copy, datalayer_event, flag, formfiller, formtracker, officehours, range, remove, season, set, threshold, top, unset } from "./modules/destination"
 import { acceptlang, cookie, get, meta, query, time, httpuseragent } from "./modules/source"
-import { getTime, getClientId } from "./lib/utility"
+import { getTime, getClientId, isLocalStorageAvailable } from "./lib/utility"
 
 class ConvivialProfiler {
 
@@ -18,6 +18,9 @@ class ConvivialProfiler {
     this.siteId = siteId;
     this.licenseKey = licenseKey;
     this.clientId = clientId || getClientId();
+    if (!isLocalStorageAvailable()) {
+      return;
+    }
     this.storage = this._loadStorage();
     this.storage.temp = {};
 
@@ -63,6 +66,9 @@ class ConvivialProfiler {
   }
 
   collect() {
+    if (!isLocalStorageAvailable()) {
+      return;
+    }
     var now = getTime();
     Object.keys(this.config.profilers).forEach(name => {
       var profiler = this.config.profilers[name];

src/lib/utility.js

@@ -26,9 +26,24 @@ function getClientId() {
   }
   return value;
 };
+function isLocalStorageAvailable() {
+  try {
+    if (typeof localStorage === 'undefined') {
+      return false;
+    }
+    var test = 'test';
+    localStorage.setItem(test, test);
+    localStorage.removeItem(test);
+    return true;
+  } catch(e) {
+    console.log('Convivial Profiler will not work because the browser local storage is not enabled or accessible.');
+    return false;
+  }
+}
 export {
   getTime,
   getCookie,
   setCookie,
-  getClientId
+  getClientId,
+  isLocalStorageAvailable
 }