Offline storage plugin

plugins/offline-storage.js

@@ -0,0 +1,61 @@
+/**
+ * Offline Storage plugin
+ * 
+ * Stores errors failed to get send and try to send them when
+ * Networkf comes back or on init
+ */
+
+var offlineStorageKey = 'raven-js-offline-queue';
+
+function offlineStoragePlugin(Raven, options) {
+  options = options || {};
+
+  function processOfflineQueue() {
+    // Let's stop here if there's no connection
+    if (!navigator.onLine) {
+      return;
+    }
+
+    try {
+      // Get the queue
+      var queue = JSON.parse(localStorage.getItem(offlineStorageKey)) || [];
+
+      // Store an empty queue. If processing these one fails they get back to the queue
+      localStorage.removeItem(offlineStorageKey);
+
+      queue.forEach(function processOfflinePayload(data) {
+        // Avoid duplication verification for offline stored
+        // as they may try multiple times to be processed
+        Raven._lastData = null;
+
+        // Try to process it again
+        Raven._sendProcessedPayload(data);
+      });
+    } catch (error) {
+      Raven._logDebug('error', 'Raven transport failed to store offline: ', error);
+    }
+  }
+
+  // Process queue on start
+  processOfflineQueue();
+
+  // Add event listener on onravenFailure and store error on localstorage
+  document.addEventListener('ravenFailure', function(event) {
+    if (!event.data) {
+      return;
+    }
+
+    try {
+      var queue = JSON.parse(localStorage.getItem(offlineStorageKey)) || [];
+      queue.push(event.data);
+      localStorage.setItem(offlineStorageKey, JSON.stringify(queue));
+    } catch (error) {
+      Raven._logDebug('error', 'Raven failed to store payload offline: ', error);
+    }
+  });
+
+  // Add event listener on online or custom event to trigger offline queue sending
+  window.addEventListener(options.onlineEventName || 'online', processOfflineQueue);
+}
+
+module.exports = offlineStoragePlugin;