save and load state

scripts/background/extractor.js

@@ -1,9 +1,31 @@
+var __EXTRACTOR_STATE__ = "";
+
 class Extractor {
     constructor(options) {
         this._tasks = [];
         this._running = false;
         this._options = options;
     }
+    /**
+     * Save current state, in case we restore it later.
+     */
+    save() {
+        saveFile(JSON.stringify(this), 'application/json', 'state.json');
+    }
+    /**
+     * Restore previous state by loading from saved state.
+     */
+    load() {
+        if (!__EXTRACTOR_STATE__) {
+            console.log('No state found. \nPlease upload a saved state from the popup window first.');
+            return;
+        }
+        let state = JSON.parse(__EXTRACTOR_STATE__);
+        __EXTRACTOR_STATE__ = "";
+        this._options = state._options;
+        this._tasks = state._tasks.map(t => new Task(this._options, 'whaterver', ['whaterver']).load(t));
+        return this;
+    }
     /**
      * Add a task to Extractor. \n
      * One Extractor could has multiple tasks, which orgnized in a task chian.
@@ -76,7 +98,7 @@ class Extractor {
         }, Promise.resolve(undefined)).then(
             () => {
                 this._running = false;
-                this.save();
+                this.export();
             }
         ).catch(err => {
             this._running = false;
@@ -84,10 +106,10 @@ class Extractor {
         });
     }
     /**
-     * Save result of a task
+     * export result of a task to CSV
      * @param {number} taskid which task id to save, begins with 0
      */
-    save(taskid) {
+    export(taskid) {
         let id = this._checkTaskId(taskid, this._tasks.length - 1);
         if (id < 0) return;
         let results = this._tasks[id].results

scripts/background/messaging.js

@@ -50,10 +50,18 @@ function sendMessage(tab, req, log, cond, interval, limit = 0) {
     });
 }
 
-chrome.runtime.onMessage.addListener(function (message, sender, sendResponse) {
-    if (!message.action || !message.action.startsWith(EXT_NAME)) {
+chrome.runtime.onMessage.addListener(function (request, sender, sendResponse) {
+    if (!request.action || !request.action.startsWith(EXT_NAME)) {
         return;
     }
-    sendResponse("Calling from user pages is not allowed.");
-    return;
+    switch (request.action) {
+        case ACTION_UPLOAD_STATE:
+            sendResponse('recieved!');
+            __EXTRACTOR_STATE__ = request.state;
+            console.log(`State (${request.name}) recieved. Use following to load it: \nsome_var = new Extractor().load()`);
+            break;
+        default:
+            sendResponse("Request not supported.");
+            break;
+    }
 });

scripts/background/task.js

@@ -17,6 +17,15 @@ class Task {
         this._fieldSelectors = args.shift();
         this._urls = parseUrls(...args);
     }
+    load(state) {
+        this._itemsSelector = state._itemsSelector;
+        this._data = state._data;
+        this._data_keys = state._data_keys;
+        this._itemsSelector = state._itemsSelector;
+        this._fieldSelectors = state._fieldSelectors;
+        this._urls = state._urls;
+        return this;
+    }
     get urls() {
         return this._urls;
     }