ADD: wallets autorefresh

BlueApp.js

@@ -26,6 +26,31 @@ async function startAndDecrypt(retry) {
     console.log('loaded from disk');
     EV(EV.enum.WALLETS_COUNT_CHANGED);
     EV(EV.enum.TRANSACTIONS_COUNT_CHANGED);
+    // now, lets try to fetch balance and txs for first wallet if it is time for it
+    let hadToRefresh = false;
+    let noErr = true;
+    try {
+      let wallets = BlueApp.getWallets();
+      if (wallets && wallets[0] && wallets[0].timeToRefresh()) {
+        console.log('time to refresh wallet #0');
+        let oldBalance = wallets[0].getBalance();
+        await wallets[0].fetchBalance();
+        if (oldBalance !== wallets.getBalance()) {
+          // balance changed, thus txs too
+          await wallets[0].fetchTransactions();
+          hadToRefresh = true;
+          EV(EV.enum.WALLETS_COUNT_CHANGED);
+          EV(EV.enum.TRANSACTIONS_COUNT_CHANGED);
+        }
+      } //  end of timeToRefresh
+    } catch (Err) {
+      noErr = false;
+      console.warn(Err);
+    }
+
+    if (hadToRefresh && noErr) {
+      await BlueApp.saveToDisk(); // caching
+    }
   }
 
   if (!success && password) {

class/legacy-wallet.js

@@ -20,6 +20,12 @@ export class LegacyWallet extends AbstractWallet {
     this._lastBalanceFetch = 0;
   }
 
+  timeToRefresh() {
+    if (+new Date() - this._lastBalanceFetch >= 60 * 1000) {
+      return true;
+    }
+  }
+
   generate() {
     function myRng(c) {
       let buf = Buffer.alloc(c);

screen/wallets/list.js

@@ -133,6 +133,42 @@ export default class WalletsList extends Component {
         50,
       ); // just to animate it, no real function
     }
+
+    // now, lets try to fetch balance and txs for this wallet in case it has changed
+    this.lazyRefreshWallet(index);
+  }
+
+  /**
+   * Decides whether wallet with such index shoud be refreshed,
+   * refreshes if yes and redraws the screen
+   * @param index {Integer} Index of the wallet.
+   * @return {Promise.<void>}
+   */
+  async lazyRefreshWallet(index) {
+    /** @type {Array.<AbstractWallet>} wallets */
+    let wallets = BlueApp.getWallets();
+    let oldBalance = wallets[index].getBalance();
+    let noErr = true;
+
+    try {
+      if (wallets && wallets[index] && wallets[index].timeToRefresh()) {
+        console.log('snapped to, and now its time to refresh wallet #', index);
+        await wallets[index].fetchBalance();
+        if (oldBalance !== wallets[index].getBalance()) {
+          // balance changed, thus txs too
+          await wallets[index].fetchTransactions();
+          this.refreshFunction();
+        }
+      }
+    } catch (Err) {
+      noErr = false;
+      console.warn(Err);
+    }
+
+    if (noErr && oldBalance !== wallets[index].getBalance()) {
+      // so we DID refresh
+      await BlueApp.saveToDisk(); // caching
+    }
   }
 
   render() {