Add config option to set maximum total routing fee

lightning-invoice/src/payment.rs

@@ -116,10 +116,7 @@ fn pay_invoice_using_amount<P: Deref>(
 	if let Some(features) = invoice.features() {
 		payment_params = payment_params.with_bolt11_features(features.clone()).unwrap();
 	}
-	let route_params = RouteParameters {
-		payment_params,
-		final_value_msat: amount_msats,
-	};
+	let route_params = RouteParameters::from_payment_params_and_value(payment_params, amount_msats);
 
 	payer.send_payment(payment_hash, recipient_onion, payment_id, route_params, retry_strategy)
 }
@@ -148,7 +145,7 @@ pub fn preflight_probe_invoice<C: AChannelManager>(
 	if let Some(features) = invoice.features() {
 		payment_params = payment_params.with_bolt11_features(features.clone()).unwrap();
 	}
-	let route_params = RouteParameters { payment_params, final_value_msat: amount_msat };
+	let route_params = RouteParameters::from_payment_params_and_value(payment_params, amount_msat);
 
 	channelmanager.get_cm().send_preflight_probes(route_params, liquidity_limit_multiplier)
 		.map_err(ProbingError::Sending)
@@ -178,7 +175,7 @@ pub fn preflight_probe_zero_value_invoice<C: AChannelManager>(
 	if let Some(features) = invoice.features() {
 		payment_params = payment_params.with_bolt11_features(features.clone()).unwrap();
 	}
-	let route_params = RouteParameters { payment_params, final_value_msat: amount_msat };
+	let route_params = RouteParameters::from_payment_params_and_value(payment_params, amount_msat);
 
 	channelmanager.get_cm().send_preflight_probes(route_params, liquidity_limit_multiplier)
 		.map_err(ProbingError::Sending)

lightning/src/ln/blinded_payment_tests.rs

@@ -47,10 +47,10 @@ fn do_one_hop_blinded_path(success: bool) {
 		nodes[1].node.get_our_node_id(), payee_tlvs, &chanmon_cfgs[1].keys_manager, &secp_ctx
 	).unwrap();
 
-	let route_params = RouteParameters {
-		payment_params: PaymentParameters::blinded(vec![blinded_path]),
-		final_value_msat: amt_msat
-	};
+	let route_params = RouteParameters::from_payment_params_and_value(
+		PaymentParameters::blinded(vec![blinded_path]),
+		amt_msat,
+	);
 	nodes[0].node.send_payment(payment_hash, RecipientOnionFields::spontaneous_empty(),
 	PaymentId(payment_hash.0), route_params, Retry::Attempts(0)).unwrap();
 	check_added_monitors(&nodes[0], 1);
@@ -90,11 +90,11 @@ fn mpp_to_one_hop_blinded_path() {
 
 	let bolt12_features: Bolt12InvoiceFeatures =
 		channelmanager::provided_invoice_features(&UserConfig::default()).to_context();
-	let route_params = RouteParameters {
-		payment_params: PaymentParameters::blinded(vec![blinded_path])
+	let route_params = RouteParameters::from_payment_params_and_value(
+		PaymentParameters::blinded(vec![blinded_path])
 			.with_bolt12_features(bolt12_features).unwrap(),
-		final_value_msat: amt_msat,
-	};
+		amt_msat,
+	);
 	nodes[0].node.send_payment(payment_hash, RecipientOnionFields::spontaneous_empty(), PaymentId(payment_hash.0), route_params, Retry::Attempts(0)).unwrap();
 	check_added_monitors(&nodes[0], 2);
 

lightning/src/ln/channelmanager.rs

@@ -3570,7 +3570,7 @@ where
 		let payment_params =
 			PaymentParameters::from_node_id(node_id, final_cltv_expiry_delta);
 
-		let route_params = RouteParameters { payment_params, final_value_msat: amount_msat };
+		let route_params = RouteParameters::from_payment_params_and_value(payment_params, amount_msat);
 
 		self.send_preflight_probes(route_params, liquidity_limit_multiplier)
 	}
@@ -9559,6 +9559,7 @@ where
 										pending_fee_msat: Some(path_fee),
 										total_msat: path_amt,
 										starting_block_height: best_block_height,
+										remaining_max_total_routing_fee_msat: None, // only used for retries, and we'll never retry on startup
 									});
 									log_info!(args.logger, "Added a pending payment for {} msat with payment hash {} for path with session priv {}",
 										path_amt, &htlc.payment_hash,  log_bytes!(session_priv_bytes));

lightning/src/ln/functional_test_utils.rs

@@ -1878,7 +1878,11 @@ macro_rules! get_route_and_payment_hash {
 		$crate::get_route_and_payment_hash!($send_node, $recv_node, payment_params, $recv_value)
 	}};
 	($send_node: expr, $recv_node: expr, $payment_params: expr, $recv_value: expr) => {{
-		let route_params = $crate::routing::router::RouteParameters::from_payment_params_and_value($payment_params, $recv_value);
+		$crate::get_route_and_payment_hash!($send_node, $recv_node, $payment_params, $recv_value, None)
+	}};
+	($send_node: expr, $recv_node: expr, $payment_params: expr, $recv_value: expr, $max_total_routing_fee_msat: expr) => {{
+		let mut route_params = $crate::routing::router::RouteParameters::from_payment_params_and_value($payment_params, $recv_value);
+		route_params.max_total_routing_fee_msat = $max_total_routing_fee_msat;
 		let (payment_preimage, payment_hash, payment_secret) =
 			$crate::ln::functional_test_utils::get_payment_preimage_hash(&$recv_node, Some($recv_value), None);
 		let route = $crate::ln::functional_test_utils::get_route(&$send_node, &route_params);