lightningd: dev_newhtlc command.

For testing point-to-point HTLCs.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

lightningd/Makefile

@@ -59,6 +59,7 @@ LIGHTNINGD_LIB_HEADERS := $(LIGHTNINGD_LIB_SRC:.c=.h)
 
 LIGHTNINGD_SRC :=				\
 	lightningd/build_utxos.c		\
+	lightningd/dev_newhtlc.c		\
 	lightningd/gossip_control.c		\
 	lightningd/hsm_control.c		\
 	lightningd/lightningd.c			\

lightningd/dev_newhtlc.c

@@ -0,0 +1,127 @@
+#include <ccan/str/hex/hex.h>
+#include <daemon/jsonrpc.h>
+#include <daemon/log.h>
+#include <daemon/sphinx.h>
+#include <lightningd/channel/gen_channel_wire.h>
+#include <lightningd/lightningd.h>
+#include <lightningd/peer_control.h>
+#include <lightningd/subd.h>
+#include <utils.h>
+
+static bool offer_htlc_reply(struct subd *subd, const u8 *msg, const int *fds,
+			     struct command *cmd)
+{
+	u64 htlc_id;
+	u16 failcode;
+	u8 *failstr;
+
+	if (!fromwire_channel_offer_htlc_reply(msg, msg, NULL,
+					       &htlc_id, &failcode, &failstr)) {
+		command_fail(cmd, "Invalid reply from daemon: %s",
+			     tal_hex(msg, msg));
+		return true;
+	}
+
+	if (failcode != 0) {
+		command_fail(cmd, "failure %u: %.*s", failcode,
+			     (int)tal_len(failstr), (char *)failstr);
+	} else {
+		struct json_result *response = new_json_result(cmd);
+
+		json_object_start(response, NULL);
+		json_add_u64(response, "id", htlc_id);
+		json_object_end(response);
+		command_success(cmd, response);
+	}
+	return true;
+}
+
+static void json_dev_newhtlc(struct command *cmd,
+			     const char *buffer, const jsmntok_t *params)
+{
+	struct lightningd *ld = ld_from_dstate(cmd->dstate);
+	struct peer *peer;
+	u8 *msg;
+	jsmntok_t *peeridtok, *msatoshitok, *expirytok, *rhashtok;
+	unsigned int expiry;
+	u64 msatoshi;
+	struct sha256 rhash;
+	struct hoppayload *hoppayloads;
+	u8 sessionkey[32];
+	struct onionpacket *packet;
+	u8 *onion;
+	struct pubkey *path = tal_arrz(cmd, struct pubkey, 1);
+
+	if (!json_get_params(buffer, params,
+			     "peerid", &peeridtok,
+			     "msatoshi", &msatoshitok,
+			     "expiry", &expirytok,
+			     "rhash", &rhashtok,
+			     NULL)) {
+		command_fail(cmd, "Need peerid, msatoshi, expiry and rhash");
+		return;
+	}
+
+	peer = peer_from_json(ld, buffer, peeridtok);
+	if (!peer) {
+		command_fail(cmd, "Could not find peer with that peerid");
+		return;
+	}
+
+	/* FIXME: These checks are horrible, use a peer flag to say it's
+	 * ready to forward! */
+	if (peer->owner && !streq(peer->owner->name, "lightningd_channel")) {
+		command_fail(cmd, "Peer not in lightningd_channel (%s instead)",
+			     peer->owner ? peer->owner->name : "unattached");
+		return;
+	}
+
+	if (!streq(peer->condition, "Normal operation")) {
+		command_fail(cmd, "Peer in condition %s", peer->condition);
+		return;
+	}
+
+	if (!json_tok_u64(buffer, msatoshitok, &msatoshi)) {
+		command_fail(cmd, "'%.*s' is not a valid number",
+			     (int)(msatoshitok->end - msatoshitok->start),
+			     buffer + msatoshitok->start);
+		return;
+	}
+	if (!json_tok_number(buffer, expirytok, &expiry)) {
+		command_fail(cmd, "'%.*s' is not a valid number",
+			     (int)(expirytok->end - expirytok->start),
+			     buffer + expirytok->start);
+		return;
+	}
+
+	if (!hex_decode(buffer + rhashtok->start,
+			rhashtok->end - rhashtok->start,
+			&rhash, sizeof(rhash))) {
+		command_fail(cmd, "'%.*s' is not a valid sha256 hash",
+			     (int)(rhashtok->end - rhashtok->start),
+			     buffer + rhashtok->start);
+		return;
+	}
+
+	tal_arr(cmd, struct pubkey, 1);
+	hoppayloads = tal_arrz(cmd, struct hoppayload, 1);
+	path[0] = *peer->id;
+	randombytes_buf(&sessionkey, sizeof(sessionkey));
+	packet = create_onionpacket(cmd, path, hoppayloads, sessionkey,
+				    rhash.u.u8, sizeof(rhash));
+	onion = serialize_onionpacket(cmd, packet);
+
+	log_debug(peer->log, "JSON command to add new HTLC");
+
+	/* FIXME: If subdaemon dies? */
+	msg = towire_channel_offer_htlc(cmd, msatoshi, expiry, &rhash, onion);
+	subd_req(peer->owner, take(msg), -1, 0, offer_htlc_reply, cmd);
+}
+
+static const struct json_command dev_newhtlc_command = {
+	"dev-newhtlc",
+	json_dev_newhtlc,
+	"Offer {peerid} an HTLC worth {msatoshi} in {expiry} (block number) with {rhash}",
+	"Returns { id: u64 } result on success"
+};
+AUTODATA(json_command, &dev_newhtlc_command);

lightningd/peer_control.c

@@ -488,7 +488,7 @@ static const struct json_command getpeers_command = {
 };
 AUTODATA(json_command, &getpeers_command);
 
-static struct peer *find_peer_json(struct lightningd *ld,
+struct peer *peer_from_json(struct lightningd *ld,
 			    const char *buffer,
 			    jsmntok_t *peeridtok)
 {
@@ -1058,7 +1058,7 @@ static void json_fund_channel(struct command *cmd,
 	}
 
 	fc->cmd = cmd;
-	fc->peer = find_peer_json(ld, buffer, peertok);
+	fc->peer = peer_from_json(ld, buffer, peertok);
 	if (!fc->peer) {
 		command_fail(cmd, "Could not find peer with that peerid");
 		return;

lightningd/peer_control.h

@@ -2,6 +2,8 @@
 #define LIGHTNING_LIGHTNINGD_PEER_CONTROL_H
 #include "config.h"
 #include <ccan/compiler/compiler.h>
+#include <ccan/list/list.h>
+#include <daemon/json.h>
 #include <daemon/netaddr.h>
 #include <lightningd/channel_config.h>
 #include <stdbool.h>
@@ -59,6 +61,9 @@ struct peer {
 
 struct peer *peer_by_unique_id(struct lightningd *ld, u64 unique_id);
 struct peer *peer_by_id(struct lightningd *ld, const struct pubkey *id);
+struct peer *peer_from_json(struct lightningd *ld,
+			    const char *buffer,
+			    jsmntok_t *peeridtok);
 
 void peer_accept_open(struct peer *peer,
 		      const struct crypto_state *cs, const u8 *msg);

lightningd/test/test-basic

@@ -50,6 +50,11 @@ check "lcli2 getpeers info | $FGREP 'Funding tx reached depth'"
 check "lcli1 getpeers | tr -s '\012\011\" ' ' ' | $FGREP 'condition : Normal operation'"
 check "lcli2 getpeers | tr -s '\012\011\" ' ' ' | $FGREP 'condition : Normal operation'"
 
+SECRET=1de08917a61cb2b62ed5937d38577f6a7bfe59c176781c6d8128018e8b5ccdfd
+RHASH=`lcli1 dev-rhash $SECRET | sed 's/.*"\([0-9a-f]*\)".*/\1/'`
+
+lcli1 dev-newhtlc $ID2 100000 $(( $(blockheight) + 10 )) $RHASH
+
 lcli1 stop
 lcli2 stop