kivy: show warning if request/invoice exceeds channel capacity

electrum/gui/kivy/uix/dialogs/invoice_dialog.py

@@ -7,8 +7,8 @@ from kivy.app import App
 from kivy.clock import Clock
 
 from electrum.gui.kivy.i18n import _
-from electrum.util import pr_tooltips, pr_color
-from electrum.util import PR_UNKNOWN, PR_UNPAID, PR_FAILED
+from electrum.util import pr_tooltips, pr_color, get_request_status
+from electrum.util import PR_UNKNOWN, PR_UNPAID, PR_FAILED, PR_TYPE_LN
 
 if TYPE_CHECKING:
     from electrum.gui.kivy.main_window import ElectrumWindow
@@ -17,10 +17,12 @@ if TYPE_CHECKING:
 Builder.load_string('''
 <InvoiceDialog@Popup>
     id: popup
+    amount: 0
     title: ''
     data: ''
     status_color: 1,1,1,1
     status_str:''
+    warning: ''
     can_pay: True
     shaded: False
     show_text: False
@@ -33,9 +35,14 @@ Builder.load_string('''
             spacing: '10dp'
             TopLabel:
                 text: root.data
+            TopLabel:
+                text: _('Amount') + ': ' + app.format_amount_and_units(root.amount)
             TopLabel:
                 text: _('Status') + ': ' + root.status_str
                 color: root.status_color
+            TopLabel:
+                warning: root.warning
+                color: (0.9, 0.6, 0.3, 1)
             Widget:
                 size_hint: 1, 0.2
             BoxLayout:
@@ -73,12 +80,19 @@ class InvoiceDialog(Factory.Popup):
         self.title = title
         self.data = data
         self.key = key
+        r = self.app.wallet.get_invoice(key)
+        self.amount = r.get('amount')
+        self.is_lightning = r.get('type') == PR_TYPE_LN
+        self.update_status()
 
-    def set_status(self, status):
-        self.status = status
-        self.status_str = pr_tooltips[status]
-        self.status_color = pr_color[status]
-        self.can_pay = self.status in[PR_UNPAID, PR_FAILED]
+    def update_status(self):
+        req = self.app.wallet.get_invoice(self.key)
+        self.status, self.status_str = get_request_status(req)
+        self.status_color = pr_color[self.status]
+        self.can_pay = self.status in [PR_UNPAID, PR_FAILED]
+        if self.can_pay and self.is_lightning and self.app.wallet.lnworker:
+            if self.amount and self.amount > self.app.wallet.lnworker.can_send():
+                self.warning = _('Warning') + ': ' + _('This amount exceeds the maximum you can currently send with your channels')
 
     def on_dismiss(self):
         self.app.request_popup = None