Update exchange rate every 15 minutes

src/action/wallet.js

@@ -5,7 +5,7 @@
 
 import { observe } from 'mobx';
 import { toBuffer, parseSat, checkHttpStatus, nap } from '../helper';
-import { MIN_PASSWORD_LENGTH, NOTIFICATION_DELAY } from '../config';
+import { MIN_PASSWORD_LENGTH, NOTIFICATION_DELAY, RATE_DELAY } from '../config';
 import * as log from './log';
 
 class WalletAction {
@@ -113,7 +113,7 @@ class WalletAction {
       this.getBalance(),
       this.getChannelBalance(),
       this.getNewAddress(),
-      this.getExchangeRate(),
+      this.pollExchangeRate(),
     ]);
   }
 
@@ -279,6 +279,17 @@ class WalletAction {
     }
   }
 
+  /**
+   * Poll for the current btc/fiat exchange rate based on the currently selected
+   * fiat currency every 15 minutes.
+   * @return {Promise<undefined>}
+   */
+  async pollExchangeRate() {
+    await this.getExchangeRate();
+    clearTimeout(this.tPollRate);
+    this.tPollRate = setTimeout(() => this.pollExchangeRate(), RATE_DELAY);
+  }
+
   /**
    * Fetch a current btc/fiat exchange rate based on the currently selected
    * fiat currency and persist the value on disk for the next time the app

src/config.js

@@ -1,6 +1,7 @@
 module.exports.RETRY_DELAY = 3000;
 module.exports.LND_INIT_DELAY = 5000;
 module.exports.NOTIFICATION_DELAY = 5000;
+module.exports.RATE_DELAY = 15 * 60 * 1000;
 
 module.exports.LND_PORT = 10009;
 module.exports.LND_PEER_PORT = 10019;

test/unit/action/wallet.spec.js

@@ -5,6 +5,7 @@ import WalletAction from '../../../src/action/wallet';
 import NavAction from '../../../src/action/nav';
 import NotificationAction from '../../../src/action/notification';
 import * as logger from '../../../src/action/log';
+import { nap } from '../../../src/helper';
 import nock from 'nock';
 import 'isomorphic-fetch';
 
@@ -23,6 +24,7 @@ describe('Action Wallet Unit Tests', () => {
     store = new Store();
     require('../../../src/config').RETRY_DELAY = 1;
     require('../../../src/config').NOTIFICATION_DELAY = 1;
+    require('../../../src/config').RATE_DELAY = 1;
     grpc = sinon.createStubInstance(GrpcAction);
     db = sinon.createStubInstance(AppStorage);
     notification = sinon.createStubInstance(NotificationAction);
@@ -31,6 +33,7 @@ describe('Action Wallet Unit Tests', () => {
   });
 
   afterEach(() => {
+    clearTimeout(wallet.tPollRate);
     sandbox.restore();
   });
 
@@ -106,10 +109,10 @@ describe('Action Wallet Unit Tests', () => {
 
   describe('update()', () => {
     it('should refresh balances, exchange rate and address', async () => {
-      sandbox.stub(wallet, 'getExchangeRate');
+      sandbox.stub(wallet, 'pollExchangeRate');
       await wallet.update();
       expect(grpc.sendCommand, 'was called thrice');
-      expect(wallet.getExchangeRate, 'was called once');
+      expect(wallet.pollExchangeRate, 'was called once');
     });
   });
 
@@ -324,6 +327,15 @@ describe('Action Wallet Unit Tests', () => {
     });
   });
 
+  describe('pollExchangeRate()', () => {
+    it('should call getExchangeRate', async () => {
+      sandbox.stub(wallet, 'getExchangeRate');
+      await wallet.pollExchangeRate();
+      await nap(30);
+      expect(wallet.getExchangeRate.callCount, 'to be greater than', 1);
+    });
+  });
+
   describe('getExchangeRate()', () => {
     it('should get exchange rate', async () => {
       nock('https://blockchain.info')