paymod: Add the final cltv delta to the getroute call

plugins/libplugin-pay.c

@@ -7,6 +7,8 @@
 #include <ccan/tal/str/str.h>
 #include <common/json_stream.h>
 
+#define DEFAULT_FINAL_CLTV_DELTA 9
+
 /* Just a container to collect a subtree result so we can summarize all
  * sub-payments and return a reasonable result to the caller of `pay` */
 struct payment_tree_result {
@@ -35,12 +37,14 @@ struct payment *payment_new(tal_t *ctx, struct command *cmd,
 	p->cmd = cmd;
 	p->start_time = time_now();
 	p->result = NULL;
+	p->getroute_cltv = DEFAULT_FINAL_CLTV_DELTA;
 
 	/* Copy over the relevant pieces of information. */
 	if (parent != NULL) {
 		assert(cmd == NULL);
 		tal_arr_expand(&parent->children, p);
 		p->destination = p->getroute_destination = parent->destination;
+		p->getroute_cltv = parent->getroute_cltv;
 		p->amount = parent->amount;
 		p->payment_hash = parent->payment_hash;
 		p->partid = payment_root(p->parent)->next_partid++;
@@ -241,6 +245,7 @@ static void payment_getroute(struct payment *p)
 	json_add_node_id(req->js, "id", p->getroute_destination);
 	json_add_amount_msat_only(req->js, "msatoshi", p->amount);
 	json_add_num(req->js, "riskfactor", 1);
+	json_add_num(req->js, "cltv", p->getroute_cltv);
 	send_outreq(p->plugin, req);
 }
 

plugins/libplugin-pay.h

@@ -2,6 +2,7 @@
 #define LIGHTNING_PLUGINS_LIBPLUGIN_PAY_H
 #include "config.h"
 
+#include <common/bolt11.h>
 #include <plugins/libplugin.h>
 #include <wire/gen_onion_wire.h>
 
@@ -129,6 +130,7 @@ struct payment {
 	 * the above destination if we use rendez-vous routing of blinded
 	 * paths to amend the route later in a mixin. */
 	struct node_id  *getroute_destination;
+	u32 getroute_cltv;
 
 	struct createonion_request *createonion_request;
 	struct createonion_response *createonion_response;
@@ -164,6 +166,8 @@ struct payment {
 	void **modifier_data;
 	int current_modifier;
 
+	struct bolt11 *invoice;
+
 	struct payment_result *result;
 };
 

plugins/pay.c

@@ -1769,7 +1769,10 @@ static struct command_result *json_paymod(struct command *cmd,
 	p->json_toks = params;
 	p->destination = p->getroute_destination = &b11->receiver_id;
 	p->payment_hash = tal_dup(p, struct sha256, &b11->payment_hash);
-	p->payment_secret = tal_dup(p, struct secret, b11->payment_secret);
+	p->payment_secret = b11->payment_secret
+				? tal_dup(p, struct secret, b11->payment_secret)
+				: NULL;
+	p->invoice = tal_steal(p, b11);
 	payment_start(p);
 	list_add_tail(&payments, &p->list);