xpay: tell injectpaymentonion what the amount being delivered to destination is.

This means that it gets shown in listsendpays: omitting this broke spark, apparently!

Changelog-Changed: `xpay` now populates more fields, so `listsendpays` and `listpays` show `destination` and `amount_msat` fields for xpay payments.
Fixes: #7881
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Author: rustyrussell

plugins/xpay/xpay.c

@@ -922,6 +922,7 @@ static struct command_result *do_inject(struct command *aux_cmd,
 	json_add_u64(req->js, "partid", attempt->partid);
 	json_add_u64(req->js, "groupid", attempt->payment->group_id);
 	json_add_string(req->js, "invstring", attempt->payment->invstring);
+	json_add_amount_msat(req->js, "destination_msat", attempt->delivers);
 	return send_payment_req(aux_cmd, attempt->payment, req);
 }
 

tests/test_xpay.py

@@ -462,6 +462,17 @@ def test_xpay_takeover(node_factory, executor):
     l1.rpc.pay(inv)
     l1.daemon.wait_for_log('Redirecting pay->xpay')
 
+    # We get destination and amount_msat in listsendpays and listpays.
+    ret = only_one(l1.rpc.listsendpays(inv)['payments'])
+    assert ret['destination'] == l3.info['id']
+    assert ret['amount_msat'] == 100000
+    assert ret['amount_sent_msat'] > 100000
+
+    ret = only_one(l1.rpc.listpays(inv)['pays'])
+    assert ret['destination'] == l3.info['id']
+    assert ret['amount_msat'] == 100000
+    assert ret['amount_sent_msat'] > 100000
+
 
 def test_xpay_preapprove(node_factory):
     l1, l2 = node_factory.line_graph(2, opts={'dev-hsmd-fail-preapprove': None})