diff --git a/common/dijkstra.c b/common/dijkstra.c index 53a17a9efdb3..11d80fe9dc3f 100644 --- a/common/dijkstra.c +++ b/common/dijkstra.c @@ -1,5 +1,7 @@ /* Without this, gheap is *really* slow! Comment out for debugging. */ +#ifndef TESTING #define NDEBUG +#endif #include "config.h" #include #include diff --git a/plugins/test/Makefile b/plugins/test/Makefile index 204a0f228d88..da960a8e0780 100644 --- a/plugins/test/Makefile +++ b/plugins/test/Makefile @@ -22,6 +22,13 @@ plugins/test/run-route-overlong: \ common/node_id.o \ common/route.o +plugins/test/run-route-calc: \ + common/fp16.o \ + common/gossmap.o \ + common/node_id.o \ + common/route.o \ + gossipd/gossip_store_wiregen.o + $(PLUGIN_TEST_PROGRAMS): $(BITCOIN_OBJS) $(WIRE_OBJS) $(PLUGIN_TEST_COMMON_OBJS) $(PLUGIN_TEST_OBJS): $(PLUGIN_FUNDER_HEADER) $(PLUGIN_FUNDER_SRC) diff --git a/plugins/test/run-route-calc.c b/plugins/test/run-route-calc.c new file mode 100644 index 000000000000..0cc9bc662c42 --- /dev/null +++ b/plugins/test/run-route-calc.c @@ -0,0 +1,560 @@ +#include "config.h" +#define TESTING +#include "../../common/dijkstra.c" +#include "../libplugin-pay.c" +#include +#include +#include +#include +#include +#include +#include + +/* AUTOGENERATED MOCKS START */ +/* Generated stub for blinded_onion_hops */ +u8 **blinded_onion_hops(const tal_t *ctx UNNEEDED, + struct amount_msat final_amount UNNEEDED, + u32 final_cltv UNNEEDED, + struct amount_msat total_amount UNNEEDED, + const struct blinded_path *path UNNEEDED) +{ fprintf(stderr, "blinded_onion_hops called!\n"); abort(); } +/* Generated stub for command_finished */ +struct command_result *command_finished(struct command *cmd UNNEEDED, struct json_stream *response UNNEEDED) +{ fprintf(stderr, "command_finished called!\n"); abort(); } +/* Generated stub for command_still_pending */ +struct command_result *command_still_pending(struct command *cmd UNNEEDED) +{ fprintf(stderr, "command_still_pending called!\n"); abort(); } +/* Generated stub for daemon_poll */ +int daemon_poll(struct pollfd *fds UNNEEDED, nfds_t nfds UNNEEDED, int timeout UNNEEDED) +{ fprintf(stderr, "daemon_poll called!\n"); abort(); } +/* Generated stub for feature_offered */ +bool feature_offered(const u8 *features UNNEEDED, size_t f UNNEEDED) +{ fprintf(stderr, "feature_offered called!\n"); abort(); } +/* Generated stub for fromwire_bigsize */ +bigsize_t fromwire_bigsize(const u8 **cursor UNNEEDED, size_t *max UNNEEDED) +{ fprintf(stderr, "fromwire_bigsize called!\n"); abort(); } +/* Generated stub for fromwire_channel_id */ +bool fromwire_channel_id(const u8 **cursor UNNEEDED, size_t *max UNNEEDED, + struct channel_id *channel_id UNNEEDED) +{ fprintf(stderr, "fromwire_channel_id called!\n"); abort(); } +/* Generated stub for gossmod_add_localchan */ +void gossmod_add_localchan(struct gossmap_localmods *mods UNNEEDED, + const struct node_id *self UNNEEDED, + const struct node_id *peer UNNEEDED, + const struct short_channel_id_dir *scidd UNNEEDED, + struct amount_msat min UNNEEDED, + struct amount_msat max UNNEEDED, + struct amount_msat fee_base UNNEEDED, + u32 fee_proportional UNNEEDED, + u32 cltv_delta UNNEEDED, + bool enabled UNNEEDED, + const char *buf UNUSED UNNEEDED, + const jsmntok_t *chantok UNUSED UNNEEDED, + void *cbarg UNUSED UNNEEDED) +{ fprintf(stderr, "gossmod_add_localchan called!\n"); abort(); } +/* Generated stub for gossmods_from_listpeerchannels_ */ +struct gossmap_localmods *gossmods_from_listpeerchannels_(const tal_t *ctx UNNEEDED, + const struct node_id *self UNNEEDED, + const char *buf UNNEEDED, + const jsmntok_t *toks UNNEEDED, + bool zero_rates UNNEEDED, + void (*cb)(struct gossmap_localmods *mods UNNEEDED, + const struct node_id *self_ UNNEEDED, + const struct node_id *peer UNNEEDED, + const struct short_channel_id_dir *scidd UNNEEDED, + struct amount_msat min UNNEEDED, + struct amount_msat max UNNEEDED, + struct amount_msat fee_base UNNEEDED, + u32 fee_proportional UNNEEDED, + u32 cltv_delta UNNEEDED, + bool enabled UNNEEDED, + const char *buf_ UNNEEDED, + const jsmntok_t *chantok UNNEEDED, + void *cbarg_) UNNEEDED, + void *cbarg UNNEEDED) +{ fprintf(stderr, "gossmods_from_listpeerchannels_ called!\n"); abort(); } +/* Generated stub for json_add_amount_msat */ +void json_add_amount_msat(struct json_stream *result UNNEEDED, + const char *msatfieldname UNNEEDED, + struct amount_msat msat) + +{ fprintf(stderr, "json_add_amount_msat called!\n"); abort(); } +/* Generated stub for json_add_hex_talarr */ +void json_add_hex_talarr(struct json_stream *result UNNEEDED, + const char *fieldname UNNEEDED, + const tal_t *data UNNEEDED) +{ fprintf(stderr, "json_add_hex_talarr called!\n"); abort(); } +/* Generated stub for json_add_invstring */ +void json_add_invstring(struct json_stream *result UNNEEDED, const char *invstring UNNEEDED) +{ fprintf(stderr, "json_add_invstring called!\n"); abort(); } +/* Generated stub for json_add_node_id */ +void json_add_node_id(struct json_stream *response UNNEEDED, + const char *fieldname UNNEEDED, + const struct node_id *id UNNEEDED) +{ fprintf(stderr, "json_add_node_id called!\n"); abort(); } +/* Generated stub for json_add_num */ +void json_add_num(struct json_stream *result UNNEEDED, const char *fieldname UNNEEDED, + unsigned int value UNNEEDED) +{ fprintf(stderr, "json_add_num called!\n"); abort(); } +/* Generated stub for json_add_preimage */ +void json_add_preimage(struct json_stream *result UNNEEDED, const char *fieldname UNNEEDED, + const struct preimage *preimage UNNEEDED) +{ fprintf(stderr, "json_add_preimage called!\n"); abort(); } +/* Generated stub for json_add_secret */ +void json_add_secret(struct json_stream *response UNNEEDED, + const char *fieldname UNNEEDED, + const struct secret *secret UNNEEDED) +{ fprintf(stderr, "json_add_secret called!\n"); abort(); } +/* Generated stub for json_add_sha256 */ +void json_add_sha256(struct json_stream *result UNNEEDED, const char *fieldname UNNEEDED, + const struct sha256 *hash UNNEEDED) +{ fprintf(stderr, "json_add_sha256 called!\n"); abort(); } +/* Generated stub for json_add_short_channel_id */ +void json_add_short_channel_id(struct json_stream *response UNNEEDED, + const char *fieldname UNNEEDED, + const struct short_channel_id *id UNNEEDED) +{ fprintf(stderr, "json_add_short_channel_id called!\n"); abort(); } +/* Generated stub for json_add_string */ +void json_add_string(struct json_stream *js UNNEEDED, + const char *fieldname UNNEEDED, + const char *str TAKES UNNEEDED) +{ fprintf(stderr, "json_add_string called!\n"); abort(); } +/* Generated stub for json_add_timeabs */ +void json_add_timeabs(struct json_stream *result UNNEEDED, const char *fieldname UNNEEDED, + struct timeabs t UNNEEDED) +{ fprintf(stderr, "json_add_timeabs called!\n"); abort(); } +/* Generated stub for json_add_u32 */ +void json_add_u32(struct json_stream *result UNNEEDED, const char *fieldname UNNEEDED, + uint32_t value UNNEEDED) +{ fprintf(stderr, "json_add_u32 called!\n"); abort(); } +/* Generated stub for json_add_u64 */ +void json_add_u64(struct json_stream *result UNNEEDED, const char *fieldname UNNEEDED, + uint64_t value UNNEEDED) +{ fprintf(stderr, "json_add_u64 called!\n"); abort(); } +/* Generated stub for json_array_end */ +void json_array_end(struct json_stream *js UNNEEDED) +{ fprintf(stderr, "json_array_end called!\n"); abort(); } +/* Generated stub for json_array_start */ +void json_array_start(struct json_stream *js UNNEEDED, const char *fieldname UNNEEDED) +{ fprintf(stderr, "json_array_start called!\n"); abort(); } +/* Generated stub for json_get_member */ +const jsmntok_t *json_get_member(const char *buffer UNNEEDED, const jsmntok_t tok[] UNNEEDED, + const char *label UNNEEDED) +{ fprintf(stderr, "json_get_member called!\n"); abort(); } +/* Generated stub for json_id_prefix */ +const char *json_id_prefix(const tal_t *ctx UNNEEDED, const struct command *cmd UNNEEDED) +{ fprintf(stderr, "json_id_prefix called!\n"); abort(); } +/* Generated stub for json_next */ +const jsmntok_t *json_next(const jsmntok_t *tok UNNEEDED) +{ fprintf(stderr, "json_next called!\n"); abort(); } +/* Generated stub for json_object_end */ +void json_object_end(struct json_stream *js UNNEEDED) +{ fprintf(stderr, "json_object_end called!\n"); abort(); } +/* Generated stub for json_object_start */ +void json_object_start(struct json_stream *ks UNNEEDED, const char *fieldname UNNEEDED) +{ fprintf(stderr, "json_object_start called!\n"); abort(); } +/* Generated stub for json_strdup */ +char *json_strdup(const tal_t *ctx UNNEEDED, const char *buffer UNNEEDED, const jsmntok_t *tok UNNEEDED) +{ fprintf(stderr, "json_strdup called!\n"); abort(); } +/* Generated stub for json_to_createonion_response */ +struct createonion_response *json_to_createonion_response(const tal_t *ctx UNNEEDED, + const char *buffer UNNEEDED, + const jsmntok_t *toks UNNEEDED) +{ fprintf(stderr, "json_to_createonion_response called!\n"); abort(); } +/* Generated stub for json_to_int */ +bool json_to_int(const char *buffer UNNEEDED, const jsmntok_t *tok UNNEEDED, int *num UNNEEDED) +{ fprintf(stderr, "json_to_int called!\n"); abort(); } +/* Generated stub for json_to_listpeers_channels */ +struct listpeers_channel **json_to_listpeers_channels(const tal_t *ctx UNNEEDED, + const char *buffer UNNEEDED, + const jsmntok_t *tok UNNEEDED) +{ fprintf(stderr, "json_to_listpeers_channels called!\n"); abort(); } +/* Generated stub for json_to_msat */ +bool json_to_msat(const char *buffer UNNEEDED, const jsmntok_t *tok UNNEEDED, + struct amount_msat *msat UNNEEDED) +{ fprintf(stderr, "json_to_msat called!\n"); abort(); } +/* Generated stub for json_to_node_id */ +bool json_to_node_id(const char *buffer UNNEEDED, const jsmntok_t *tok UNNEEDED, + struct node_id *id UNNEEDED) +{ fprintf(stderr, "json_to_node_id called!\n"); abort(); } +/* Generated stub for json_to_number */ +bool json_to_number(const char *buffer UNNEEDED, const jsmntok_t *tok UNNEEDED, + unsigned int *num UNNEEDED) +{ fprintf(stderr, "json_to_number called!\n"); abort(); } +/* Generated stub for json_to_preimage */ +bool json_to_preimage(const char *buffer UNNEEDED, const jsmntok_t *tok UNNEEDED, struct preimage *preimage UNNEEDED) +{ fprintf(stderr, "json_to_preimage called!\n"); abort(); } +/* Generated stub for json_to_sat */ +bool json_to_sat(const char *buffer UNNEEDED, const jsmntok_t *tok UNNEEDED, + struct amount_sat *sat UNNEEDED) +{ fprintf(stderr, "json_to_sat called!\n"); abort(); } +/* Generated stub for json_to_short_channel_id */ +bool json_to_short_channel_id(const char *buffer UNNEEDED, const jsmntok_t *tok UNNEEDED, + struct short_channel_id *scid UNNEEDED) +{ fprintf(stderr, "json_to_short_channel_id called!\n"); abort(); } +/* Generated stub for json_to_u16 */ +bool json_to_u16(const char *buffer UNNEEDED, const jsmntok_t *tok UNNEEDED, + uint16_t *num UNNEEDED) +{ fprintf(stderr, "json_to_u16 called!\n"); abort(); } +/* Generated stub for json_to_u32 */ +bool json_to_u32(const char *buffer UNNEEDED, const jsmntok_t *tok UNNEEDED, u32 *num UNNEEDED) +{ fprintf(stderr, "json_to_u32 called!\n"); abort(); } +/* Generated stub for json_to_u64 */ +bool json_to_u64(const char *buffer UNNEEDED, const jsmntok_t *tok UNNEEDED, u64 *num UNNEEDED) +{ fprintf(stderr, "json_to_u64 called!\n"); abort(); } +/* Generated stub for json_tok_bin_from_hex */ +u8 *json_tok_bin_from_hex(const tal_t *ctx UNNEEDED, const char *buffer UNNEEDED, const jsmntok_t *tok UNNEEDED) +{ fprintf(stderr, "json_tok_bin_from_hex called!\n"); abort(); } +/* Generated stub for json_tok_full */ +const char *json_tok_full(const char *buffer UNNEEDED, const jsmntok_t *t UNNEEDED) +{ fprintf(stderr, "json_tok_full called!\n"); abort(); } +/* Generated stub for json_tok_full_len */ +int json_tok_full_len(const jsmntok_t *t UNNEEDED) +{ fprintf(stderr, "json_tok_full_len called!\n"); abort(); } +/* Generated stub for json_tok_streq */ +bool json_tok_streq(const char *buffer UNNEEDED, const jsmntok_t *tok UNNEEDED, const char *str UNNEEDED) +{ fprintf(stderr, "json_tok_streq called!\n"); abort(); } +/* Generated stub for jsonrpc_request_start_ */ +struct out_req *jsonrpc_request_start_(struct plugin *plugin UNNEEDED, + struct command *cmd UNNEEDED, + const char *method UNNEEDED, + const char *id_prefix UNNEEDED, + struct command_result *(*cb)(struct command *command UNNEEDED, + const char *buf UNNEEDED, + const jsmntok_t *result UNNEEDED, + void *arg) UNNEEDED, + struct command_result *(*errcb)(struct command *command UNNEEDED, + const char *buf UNNEEDED, + const jsmntok_t *result UNNEEDED, + void *arg) UNNEEDED, + void *arg UNNEEDED) +{ fprintf(stderr, "jsonrpc_request_start_ called!\n"); abort(); } +/* Generated stub for jsonrpc_stream_fail */ +struct json_stream *jsonrpc_stream_fail(struct command *cmd UNNEEDED, + int code UNNEEDED, + const char *err UNNEEDED) +{ fprintf(stderr, "jsonrpc_stream_fail called!\n"); abort(); } +/* Generated stub for jsonrpc_stream_success */ +struct json_stream *jsonrpc_stream_success(struct command *cmd UNNEEDED) +{ fprintf(stderr, "jsonrpc_stream_success called!\n"); abort(); } +/* Generated stub for notleak_ */ +void *notleak_(void *ptr UNNEEDED, bool plus_children UNNEEDED) +{ fprintf(stderr, "notleak_ called!\n"); abort(); } +/* Generated stub for plugin_err */ +void plugin_err(struct plugin *p UNNEEDED, const char *fmt UNNEEDED, ...) +{ fprintf(stderr, "plugin_err called!\n"); abort(); } +/* Generated stub for plugin_log */ +void plugin_log(struct plugin *p UNNEEDED, enum log_level l UNNEEDED, const char *fmt UNNEEDED, ...) +{ fprintf(stderr, "plugin_log called!\n"); abort(); } +/* Generated stub for plugin_notification_end */ +void plugin_notification_end(struct plugin *plugin UNNEEDED, + struct json_stream *stream TAKES UNNEEDED) +{ fprintf(stderr, "plugin_notification_end called!\n"); abort(); } +/* Generated stub for plugin_notification_start */ +struct json_stream *plugin_notification_start(struct plugin *plugins UNNEEDED, + const char *method UNNEEDED) +{ fprintf(stderr, "plugin_notification_start called!\n"); abort(); } +/* Generated stub for random_select */ +bool random_select(double weight UNNEEDED, double *tot_weight UNNEEDED) +{ fprintf(stderr, "random_select called!\n"); abort(); } +/* Generated stub for send_outreq */ +struct command_result *send_outreq(struct plugin *plugin UNNEEDED, + const struct out_req *req UNNEEDED) +{ fprintf(stderr, "send_outreq called!\n"); abort(); } +/* Generated stub for towire_bigsize */ +void towire_bigsize(u8 **pptr UNNEEDED, const bigsize_t val UNNEEDED) +{ fprintf(stderr, "towire_bigsize called!\n"); abort(); } +/* Generated stub for towire_channel_id */ +void towire_channel_id(u8 **pptr UNNEEDED, const struct channel_id *channel_id UNNEEDED) +{ fprintf(stderr, "towire_channel_id called!\n"); abort(); } +/* AUTOGENERATED MOCKS END */ + +#ifndef SUPERVERBOSE +#define SUPERVERBOSE(...) +#endif + +static void write_to_store(int store_fd, const u8 *msg) +{ + struct gossip_hdr hdr; + + hdr.flags = cpu_to_be16(0); + hdr.len = cpu_to_be16(tal_count(msg)); + /* We don't actually check these! */ + hdr.crc = 0; + hdr.timestamp = 0; + assert(write(store_fd, &hdr, sizeof(hdr)) == sizeof(hdr)); + assert(write(store_fd, msg, tal_count(msg)) == tal_count(msg)); +} + +static void update_connection(int store_fd, + const struct node_id *from, + const struct node_id *to, + const struct short_channel_id *scid, + struct amount_msat min, + struct amount_msat max, + u32 base_fee, s32 proportional_fee, + u32 delay, + bool disable) +{ + secp256k1_ecdsa_signature dummy_sig; + u8 flags = node_id_idx(from, to); + u8 *msg; + + if (disable) + flags |= ROUTING_FLAGS_DISABLED; + + /* So valgrind doesn't complain */ + memset(&dummy_sig, 0, sizeof(dummy_sig)); + + msg = towire_channel_update(tmpctx, + &dummy_sig, + &chainparams->genesis_blockhash, + scid, 0, + ROUTING_OPT_HTLC_MAX_MSAT, + flags, + delay, + min, + base_fee, + proportional_fee, + max); + + write_to_store(store_fd, msg); +} + +static void node_id(char n, struct node_id *id) +{ + struct privkey p; + struct pubkey k; + memset(&p, n, sizeof(p)); + pubkey_from_privkey(&p, &k); + node_id_from_pubkey(id, &k); +} + +static struct short_channel_id_dir add_connection(int store_fd, char from, char to, + u32 base_fee, + s32 proportional_fee, + u32 delay, + struct amount_sat capacity) +{ + secp256k1_ecdsa_signature dummy_sig; + struct secret not_a_secret; + struct pubkey dummy_key; + u8 *msg; + struct node_id from_id, to_id; + const struct node_id *ids[2]; + static struct short_channel_id_dir scidd; + + /* So valgrind doesn't complain */ + memset(&dummy_sig, 0, sizeof(dummy_sig)); + memset(¬_a_secret, 1, sizeof(not_a_secret)); + pubkey_from_secret(¬_a_secret, &dummy_key); + + node_id(from, &from_id); + node_id(to, &to_id); + + if (node_id_cmp(&from_id, &to_id) > 0) { + scidd.dir = 1; + ids[0] = &to_id; + ids[1] = &from_id; + } else { + scidd.dir = 0; + ids[0] = &from_id; + ids[1] = &to_id; + } + scidd.scid.u64++; + msg = towire_channel_announcement(tmpctx, &dummy_sig, &dummy_sig, + &dummy_sig, &dummy_sig, + /* features */ NULL, + &chainparams->genesis_blockhash, + &scidd.scid, + ids[0], ids[1], + &dummy_key, &dummy_key); + write_to_store(store_fd, msg); + msg = towire_gossip_store_channel_amount(tmpctx, capacity); + write_to_store(store_fd, msg); + + update_connection(store_fd, &from_id, &to_id, &scidd.scid, + AMOUNT_MSAT(0), + amount_msat(capacity.satoshis * 1000), + base_fee, proportional_fee, + delay, false); + return scidd; +} + +/* A -> B -> C -> D -> E + * + * Each node has two channels with the next, one has worse characteristics. + */ +int main(int argc, char *argv[]) +{ + struct payment *p; + struct payment_modifier **mods; + + common_setup(argv[0]); + chainparams = chainparams_for_network("regtest"); + + mods = tal_arrz(tmpctx, struct payment_modifier *, 1); + p = payment_new(mods, tal(tmpctx, struct command), NULL, mods); + + /* We want to permute order of channels between each node, to + * avoid "it works because it chooses the first one!" */ + for (size_t i = 0; i < 2; i++) { + const char gossip_version = 10; + struct gossmap *gossmap; + char *gossipfilename; + int store_fd; + struct short_channel_id_dir scids[2], path[4]; + struct route_hop *r; + struct node_id src, dst; + const struct dijkstra *dij; + const char *errmsg; + u32 risk_factor = 10; + + store_fd = tmpdir_mkstemp(tmpctx, "run-route-calc.XXXXXX", + &gossipfilename); + assert(write(store_fd, &gossip_version, sizeof(gossip_version)) + == sizeof(gossip_version)); + + /* Cheap base vs expensive base */ + scids[0] = add_connection(store_fd, 'A', 'B', + 1000 * !i, + 100, + 1, + AMOUNT_SAT(100000000)); + scids[1] = add_connection(store_fd, 'A', 'B', + 1000 * !!i, + 100, + 1, + AMOUNT_SAT(100000000)); + path[0] = scids[!i]; + + /* Cheap proportion vs expensive proportion */ + scids[0] = add_connection(store_fd, 'B', 'C', + 1000, + 100 * !i, + 1, + AMOUNT_SAT(100000000)); + scids[1] = add_connection(store_fd, 'B', 'C', + 1000, + 100 * !!i, + 1, + AMOUNT_SAT(100000000)); + path[1] = scids[!i]; + + /* Low delay vs high delay */ + scids[0] = add_connection(store_fd, 'C', 'D', + 1000, + 100, + 10 * !i, + AMOUNT_SAT(100000000)); + scids[1] = add_connection(store_fd, 'C', 'D', + 1000, + 100, + 10 * !!i, + AMOUNT_SAT(100000000)); + path[2] = scids[!i]; + + /* High capacity vs low capacity */ + scids[0] = add_connection(store_fd, 'D', 'E', + 1000, + 100, + 1, + amount_sat(100 + 100000000 * !!i)); + scids[1] = add_connection(store_fd, 'D', 'E', + 1000, + 100, + 1, + amount_sat(100 + 100000000 * !i)); + path[3] = scids[!i]; + + gossmap = gossmap_load(tmpctx, gossipfilename, NULL); + global_gossmap = gossmap; + + node_id('A', &src); + node_id('E', &dst); + + /* First check high level code gives correct answer */ + r = route(tmpctx, gossmap, + gossmap_find_node(gossmap, &src), + gossmap_find_node(gossmap, &dst), + /* 80 sats: should bias us against 100 sat channel */ + AMOUNT_MSAT(80000), + /* Final delay */ + 22, + risk_factor, + /* Max hops */ + ARRAY_SIZE(path) + 1, + p, + &errmsg); + + assert(r); + assert(errmsg == NULL); + assert(tal_count(r) == ARRAY_SIZE(path)); + + for (size_t j = 0; j < ARRAY_SIZE(path); j++) { + assert(short_channel_id_eq(&r[j].scid, &path[j].scid)); + assert(r[j].direction == path[j].dir); + } + + /* Now check Dijkstra directly */ + dij = dijkstra(tmpctx, gossmap, gossmap_find_node(gossmap, &dst), + AMOUNT_MSAT(80000), + risk_factor, + payment_route_can_carry, route_score, p); + + /* It's a line, distances should decrement */ + assert(dijkstra_distance(dij, 0) == 4); + assert(dijkstra_distance(dij, 1) == 3); + assert(dijkstra_distance(dij, 2) == 2); + assert(dijkstra_distance(dij, 3) == 1); + assert(dijkstra_distance(dij, 4) == 0); + + /* Cost should climb as we go. */ + struct amount_msat amount = AMOUNT_MSAT(80000); + assert(amount_msat_eq(dij[4].amount, amount)); + assert(amount_msat_add_fee(&amount, 1000, 100)); + assert(amount_msat_eq(dij[3].amount, amount)); + assert(amount_msat_add_fee(&amount, 1000, 100)); + assert(amount_msat_eq(dij[2].amount, amount)); + assert(amount_msat_add_fee(&amount, 1000, 0)); + assert(amount_msat_eq(dij[1].amount, amount)); + assert(amount_msat_add_fee(&amount, 0, 100)); + assert(amount_msat_eq(dij[0].amount, amount)); + + /* Similarly, score should climb as we go */ + u64 score = 0; + struct amount_msat fee; + assert(dij[4].score == score); + assert(amount_msat_fee(&fee, dij[3].amount, 1000, 100)); + score += route_score(fee, + risk_price(dij[3].amount, risk_factor, 1), + dij[3].amount, + path[3].dir, + gossmap_find_chan(gossmap, &path[3].scid)); + assert(dij[3].score == score); + assert(amount_msat_fee(&fee, dij[2].amount, 1000, 100)); + score += route_score(fee, + risk_price(dij[2].amount, risk_factor, 1), + dij[2].amount, + path[2].dir, + gossmap_find_chan(gossmap, &path[2].scid)); + assert(dij[2].score == score); + assert(amount_msat_fee(&fee, dij[1].amount, 1000, 0)); + score += route_score(fee, + risk_price(dij[1].amount, risk_factor, 0), + dij[1].amount, + path[1].dir, + gossmap_find_chan(gossmap, &path[1].scid)); + assert(dij[1].score == score); + assert(amount_msat_fee(&fee, dij[0].amount, 0, 100)); + score += route_score(fee, + risk_price(dij[0].amount, risk_factor, 1), + dij[0].amount, + path[0].dir, + gossmap_find_chan(gossmap, &path[0].scid)); + assert(dij[0].score == score); + } + + common_shutdown(); + return 0; +}