Merge pull request #1032 from lightninglabs/inbound-capacity-error

Show warning ntfn when generating an invoice that's too big to receive.

Author: valentinewallace

src/action/invoice.js

@@ -61,8 +61,10 @@ class InvoiceAction {
   async generateUri() {
     try {
       const { invoice, settings } = this._store;
+      const satAmount = toSatoshis(invoice.amount, settings);
+      this.checkAmount({ satAmount });
       const response = await this._grpc.sendCommand('addInvoice', {
-        value: toSatoshis(invoice.amount, settings),
+        value: satAmount,
         memo: invoice.note,
         expiry: 172800,
         private: true,
@@ -75,6 +77,23 @@ class InvoiceAction {
     }
   }
 
+  /**
+   * Verify that the user has a channel with enough receive capacity to
+   * receive the given amount.
+   * @param  {number} options.satAmount The amount to receive.
+   * @return {undefined}
+   */
+  checkAmount({ satAmount }) {
+    const { channels } = this._store;
+    const hasInbound = channels.find(c => c.remoteBalance >= satAmount);
+    if (hasInbound) {
+      return;
+    }
+    this._notification.display({
+      msg: "You don't have enough inbound capacity to receive this payment.",
+    });
+  }
+
   /**
    * A simple wrapper around the react native clipboard api. This can
    * be called when a string like a payment request or address should be

test/unit/action/invoice.spec.js

@@ -77,7 +77,7 @@ describe('Action Invoice Unit Tests', () => {
       grpc.sendCommand.rejects(new Error('Boom!'));
       await invoice.generateUri();
       expect(nav.goInvoiceQR, 'was not called');
-      expect(notification.display, 'was called once');
+      expect(notification.display, 'was called twice');
     });
   });
 
@@ -87,4 +87,29 @@ describe('Action Invoice Unit Tests', () => {
       expect(clipboard.setString, 'was called with', 'foo');
     });
   });
+
+  describe('checkAmount()', () => {
+    beforeEach(() => {
+      store.channels = [
+        {
+          chanId: 42,
+          active: true,
+          capacity: 100,
+          localBalance: 10,
+          remoteBalance: 90,
+          channelPoint: 'FFFF:1',
+        },
+      ];
+    });
+
+    it('should show a notification if the amount is too big to receive', () => {
+      invoice.checkAmount({ satAmount: 91 });
+      expect(notification.display, 'was called once');
+    });
+
+    it('should not show a notification if the amount is below the max', () => {
+      invoice.checkAmount({ satAmount: 90 });
+      expect(notification.display, 'was not called');
+    });
+  });
 });