From 3f12b641a5606ee6c4554f027a404a85a3057ba4 Mon Sep 17 00:00:00 2001
From: lollerfirst <lollerfirst@gmail.com>
Date: Thu, 9 Jan 2025 16:19:19 +0100
Subject: [PATCH] Lnd gRPC

---
 cashu/lightning/lnd_grpc/lnd_grpc.py | 33 ++++++++++++++++------------
 1 file changed, 19 insertions(+), 14 deletions(-)

diff --git a/cashu/lightning/lnd_grpc/lnd_grpc.py b/cashu/lightning/lnd_grpc/lnd_grpc.py
index d6b8cb0f..10e5dcf8 100644
--- a/cashu/lightning/lnd_grpc/lnd_grpc.py
+++ b/cashu/lightning/lnd_grpc/lnd_grpc.py
@@ -245,21 +245,26 @@ async def pay_partial_invoice(
                 )
                 """
                 # modify the mpp_record in the last hop
-                route_nr = 0
-                r.routes[route_nr].hops[-1].mpp_record.payment_addr = bytes.fromhex(  # type: ignore
-                    payer_addr
-                )
-                r.routes[route_nr].hops[  # type: ignore
-                    -1
-                ].mpp_record.total_amt_msat = total_amount_msat
-
-                # Send to route request
-                r = await router_stub.SendToRouteV2(
-                    routerrpc.SendToRouteRequest(
-                        payment_hash=bytes.fromhex(invoice.payment_hash),
-                        route=r.routes[route_nr],  # type: ignore
+                for route_nr in range(len(r.routes)):
+                    r.routes[route_nr].hops[-1].mpp_record.payment_addr = bytes.fromhex(  # type: ignore
+                        payer_addr
                     )
-                )
+                    r.routes[route_nr].hops[  # type: ignore
+                        -1
+                    ].mpp_record.total_amt_msat = total_amount_msat
+
+                    # Send to route request
+                    r = await router_stub.SendToRouteV2(
+                        routerrpc.SendToRouteRequest(
+                            payment_hash=bytes.fromhex(invoice.payment_hash),
+                            route=r.routes[route_nr],  # type: ignore
+                        )
+                    )
+                    if r.status == lnrpc.HTLCAttempt.HTLCStatus.FAILED:
+                        if r.failure.code == lnrpc.Failure.FailureCode.TEMPORARY_CHANNEL_FAILURE:
+                            # Try a different route
+                            continue
+                    break
         except AioRpcError as e:
             logger.error(f"QueryRoute or SendToRouteV2 failed: {e}")
             return PaymentResponse(