feat: refresh qr code (#68)

close #60

src/Client.js

@@ -83,21 +83,34 @@ class Client extends EventEmitter {
             }
 
         } else {
+            const getQrCode = async () => {
+                // Check if retry button is present
+                var QR_RETRY_SELECTOR = 'div[data-ref] > span > div';
+                var qrRetry = await page.$(QR_RETRY_SELECTOR);
+                if (qrRetry) {
+                    await qrRetry.click();
+                }
+
                 // Wait for QR Code
+
                 const QR_CANVAS_SELECTOR = 'canvas';
                 await page.waitForSelector(QR_CANVAS_SELECTOR);
                 const qrImgData = await page.$eval(QR_CANVAS_SELECTOR, canvas => [].slice.call(canvas.getContext('2d').getImageData(0, 0, 264, 264).data));
                 const qr = jsQR(qrImgData, 264, 264).data;
-
                 /**
                 * Emitted when the QR code is received
                 * @event Client#qr
                 * @param {string} qr QR Code
                 */
                 this.emit(Events.QR_RECEIVED, qr);
+            };
+            getQrCode();
+            let retryInterval = setInterval(getQrCode, 20000); // check for qr code every 20 seconds
 
             // Wait for code scan
             await page.waitForSelector(KEEP_PHONE_CONNECTED_IMG_SELECTOR, { timeout: 0 });
+            clearInterval(retryInterval);
+
         }
 
         await page.evaluate(ExposeStore, moduleRaid.toString());