ZmnSCPxj
7 years ago
committed by
Christian Decker
Christian Decker
5 changed files with 314 additions and 206 deletions
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#include "pay.h" |
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#include "payalgo.h" |
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#include <ccan/tal/str/str.h> |
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#include <common/bolt11.h> |
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#include <gossipd/gen_gossip_wire.h> |
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#include <gossipd/routing.h> |
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#include <lightningd/jsonrpc.h> |
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#include <lightningd/jsonrpc_errors.h> |
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#include <lightningd/lightningd.h> |
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#include <lightningd/subd.h> |
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struct pay { |
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struct sha256 payment_hash; |
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struct command *cmd; |
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u64 msatoshi; |
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double maxfeepercent; |
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}; |
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/* Duplicated here from lightningd/pay.c, but will be modified
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* in a later commit. */ |
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static void |
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json_sendpay_success(struct command *cmd, |
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const struct preimage *payment_preimage) |
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{ |
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struct json_result *response; |
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response = new_json_result(cmd); |
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json_object_start(response, NULL); |
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json_add_hex(response, "preimage", |
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payment_preimage, sizeof(*payment_preimage)); |
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json_object_end(response); |
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command_success(cmd, response); |
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} |
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/* Duplicated here from lightningd/pay.c, but will be modified
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* in a later commit. */ |
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static void json_sendpay_on_resolve(const struct sendpay_result *r, |
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void *vcmd) |
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{ |
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struct command *cmd = (struct command*) vcmd; |
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struct json_result *data; |
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const char *msg; |
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struct routing_failure *fail; |
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if (r->succeeded) |
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json_sendpay_success(cmd, &r->preimage); |
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else { |
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switch (r->errorcode) { |
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case PAY_IN_PROGRESS: |
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case PAY_RHASH_ALREADY_USED: |
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data = NULL; |
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msg = r->details; |
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break; |
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case PAY_UNPARSEABLE_ONION: |
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data = new_json_result(cmd); |
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json_object_start(data, NULL); |
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json_add_hex(data, "onionreply", |
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r->onionreply, tal_len(r->onionreply)); |
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json_object_end(data); |
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msg = tal_fmt(cmd, |
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"failed: WIRE_PERMANENT_NODE_FAILURE " |
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"(%s)", |
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r->details); |
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break; |
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case PAY_DESTINATION_PERM_FAIL: |
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case PAY_TRY_OTHER_ROUTE: |
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fail = r->routing_failure; |
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data = new_json_result(cmd); |
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json_object_start(data, NULL); |
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json_add_num(data, "erring_index", |
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fail->erring_index); |
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json_add_num(data, "failcode", |
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(unsigned) fail->failcode); |
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json_add_hex(data, "erring_node", |
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&fail->erring_node, |
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sizeof(fail->erring_node)); |
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json_add_short_channel_id(data, "erring_channel", |
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&fail->erring_channel); |
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if (fail->channel_update) |
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json_add_hex(data, "channel_update", |
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fail->channel_update, |
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tal_len(fail->channel_update)); |
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json_object_end(data); |
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msg = tal_fmt(cmd, |
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"failed: %s (%s)", |
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onion_type_name(fail->failcode), |
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r->details); |
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break; |
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} |
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command_fail_detailed(cmd, r->errorcode, data, "%s", msg); |
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} |
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} |
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static void json_pay_getroute_reply(struct subd *gossip, |
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const u8 *reply, const int *fds, |
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struct pay *pay) |
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{ |
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struct route_hop *route; |
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u64 msatoshi_sent; |
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u64 fee; |
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double feepercent; |
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struct json_result *data; |
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fromwire_gossip_getroute_reply(reply, reply, NULL, &route); |
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if (tal_count(route) == 0) { |
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command_fail_detailed(pay->cmd, PAY_ROUTE_NOT_FOUND, NULL, |
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"Could not find a route"); |
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return; |
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} |
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msatoshi_sent = route[0].amount; |
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fee = msatoshi_sent - pay->msatoshi; |
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/* FIXME: IEEE Double-precision floating point has only 53 bits
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* of precision. Total satoshis that can ever be created is |
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* slightly less than 2100000000000000. Total msatoshis that |
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* can ever be created is 1000 times that or |
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* 2100000000000000000, requiring 60.865 bits of precision, |
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* and thus losing precision in the below. Currently, OK, as, |
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* payments are limited to 4294967295 msatoshi. */ |
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feepercent = ((double) fee) * 100.0 / ((double) pay->msatoshi); |
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if (feepercent > pay->maxfeepercent) { |
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data = new_json_result(pay); |
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json_object_start(data, NULL); |
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json_add_u64(data, "fee", fee); |
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json_add_double(data, "feepercent", feepercent); |
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json_add_u64(data, "msatoshi", pay->msatoshi); |
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json_add_double(data, "maxfeepercent", pay->maxfeepercent); |
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json_object_end(data); |
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command_fail_detailed(pay->cmd, PAY_ROUTE_TOO_EXPENSIVE, |
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data, |
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"Fee %"PRIu64" is %f%% " |
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"of payment %"PRIu64"; " |
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"max fee requested is %f%%", |
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fee, feepercent, |
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pay->msatoshi, |
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pay->maxfeepercent); |
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return; |
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} |
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send_payment(pay->cmd, pay->cmd->ld, &pay->payment_hash, route, |
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&json_sendpay_on_resolve, pay->cmd); |
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} |
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static void json_pay(struct command *cmd, |
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const char *buffer, const jsmntok_t *params) |
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{ |
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jsmntok_t *bolt11tok, *msatoshitok, *desctok, *riskfactortok, *maxfeetok; |
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double riskfactor = 1.0; |
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double maxfeepercent = 0.5; |
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u64 msatoshi; |
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struct pay *pay = tal(cmd, struct pay); |
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struct bolt11 *b11; |
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char *fail, *b11str, *desc; |
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u8 *req; |
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if (!json_get_params(cmd, buffer, params, |
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"bolt11", &bolt11tok, |
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"?msatoshi", &msatoshitok, |
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"?description", &desctok, |
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"?riskfactor", &riskfactortok, |
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"?maxfeepercent", &maxfeetok, |
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NULL)) { |
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return; |
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} |
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b11str = tal_strndup(cmd, buffer + bolt11tok->start, |
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bolt11tok->end - bolt11tok->start); |
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if (desctok) |
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desc = tal_strndup(cmd, buffer + desctok->start, |
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desctok->end - desctok->start); |
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else |
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desc = NULL; |
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b11 = bolt11_decode(pay, b11str, desc, &fail); |
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if (!b11) { |
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command_fail(cmd, "Invalid bolt11: %s", fail); |
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return; |
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} |
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pay->cmd = cmd; |
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pay->payment_hash = b11->payment_hash; |
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if (b11->msatoshi) { |
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msatoshi = *b11->msatoshi; |
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if (msatoshitok) { |
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command_fail(cmd, "msatoshi parameter unnecessary"); |
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return; |
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} |
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} else { |
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if (!msatoshitok) { |
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command_fail(cmd, "msatoshi parameter required"); |
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return; |
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} |
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if (!json_tok_u64(buffer, msatoshitok, &msatoshi)) { |
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command_fail(cmd, |
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"msatoshi '%.*s' is not a valid number", |
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(int)(msatoshitok->end-msatoshitok->start), |
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buffer + msatoshitok->start); |
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return; |
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} |
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} |
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pay->msatoshi = msatoshi; |
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if (riskfactortok |
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&& !json_tok_double(buffer, riskfactortok, &riskfactor)) { |
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command_fail(cmd, "'%.*s' is not a valid double", |
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(int)(riskfactortok->end - riskfactortok->start), |
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buffer + riskfactortok->start); |
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return; |
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} |
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if (maxfeetok |
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&& !json_tok_double(buffer, maxfeetok, &maxfeepercent)) { |
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command_fail(cmd, "'%.*s' is not a valid double", |
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(int)(maxfeetok->end - maxfeetok->start), |
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buffer + maxfeetok->start); |
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return; |
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} |
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/* Ensure it is in range 0.0 <= maxfeepercent <= 100.0 */ |
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if (!(0.0 <= maxfeepercent)) { |
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command_fail(cmd, "%f maxfeepercent must be non-negative", |
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maxfeepercent); |
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return; |
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} |
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if (!(maxfeepercent <= 100.0)) { |
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command_fail(cmd, "%f maxfeepercent must be <= 100.0", |
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maxfeepercent); |
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return; |
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} |
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pay->maxfeepercent = maxfeepercent; |
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/* FIXME: use b11->routes */ |
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req = towire_gossip_getroute_request(cmd, &cmd->ld->id, |
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&b11->receiver_id, |
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msatoshi, riskfactor*1000, |
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b11->min_final_cltv_expiry); |
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subd_req(pay, cmd->ld->gossip, req, -1, 0, json_pay_getroute_reply, pay); |
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command_still_pending(cmd); |
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} |
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static const struct json_command pay_command = { |
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"pay", |
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json_pay, |
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"Send payment specified by {bolt11} with optional {msatoshi} " |
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"(if and only if {bolt11} does not have amount), " |
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"{description} (required if {bolt11} uses description hash), " |
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"{riskfactor} (default 1.0), and " |
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"{maxfeepercent} (default 0.5) the maximum acceptable fee as a percentage (e.g. 0.5 => 0.5%)" |
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}; |
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AUTODATA(json_command, &pay_command); |
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@ -0,0 +1,5 @@ |
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#ifndef LIGHTNING_LIGHTNINGD_PAYALGO_H |
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#define LIGHTNING_LIGHTNINGD_PAYALGO_H |
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#include "config.h" |
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#endif /* LIGHTNING_LIGHTNINGD_PAYALGO_H */ |
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