Browse Source
This is the command an actual user would use: it figures out the fee and route, and pays it if it can. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>ppa-0.6.1
Rusty Russell
9 years ago
9 changed files with 262 additions and 28 deletions
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#include "chaintopology.h" |
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#include "jsonrpc.h" |
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#include "lightningd.h" |
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#include "log.h" |
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#include "onion.h" |
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#include "pay.h" |
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#include "peer.h" |
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#include "routing.h" |
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#include <ccan/str/hex/hex.h> |
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#include <inttypes.h> |
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/* Outstanding "pay" commands. */ |
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struct pay_command { |
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struct list_node list; |
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struct htlc *htlc; |
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struct command *cmd; |
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}; |
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void complete_pay_command(struct peer *peer, |
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struct htlc *htlc, |
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const struct rval *rval) |
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{ |
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struct pay_command *i; |
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list_for_each(&peer->pay_commands, i, list) { |
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if (i->htlc == htlc) { |
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if (rval) { |
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struct json_result *response; |
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response = new_json_result(i->cmd); |
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json_object_start(response, NULL); |
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json_add_hex(response, "preimage", |
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rval->r, sizeof(rval->r)); |
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json_object_end(response); |
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command_success(i->cmd, response); |
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} else { |
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command_fail(i->cmd, "htlc failed"); |
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} |
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return; |
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} |
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} |
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/* Can happen if RPC connection goes away. */ |
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log_unusual(peer->log, "No command for HTLC %"PRIu64" %s", |
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htlc->id, rval ? "fulfill" : "fail"); |
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} |
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static void remove_from_list(struct pay_command *pc) |
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{ |
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list_del(&pc->list); |
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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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struct pubkey id; |
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jsmntok_t *idtok, *msatoshistok, *rhashtok; |
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unsigned int expiry; |
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int i; |
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u64 msatoshis; |
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s64 fee; |
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struct sha256 rhash; |
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struct node_connection **route; |
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struct peer *peer; |
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struct pay_command *pc; |
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const u8 *onion; |
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if (!json_get_params(buffer, params, |
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"id", &idtok, |
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"msatoshis", &msatoshistok, |
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"rhash", &rhashtok, |
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NULL)) { |
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command_fail(cmd, "Need id, msatoshis and rhash"); |
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return; |
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} |
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if (!pubkey_from_hexstr(cmd->dstate->secpctx, |
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buffer + idtok->start, |
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idtok->end - idtok->start, &id)) { |
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command_fail(cmd, "Invalid id"); |
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return; |
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} |
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if (!json_tok_u64(buffer, msatoshistok, &msatoshis)) { |
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command_fail(cmd, "'%.*s' is not a valid number", |
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(int)(msatoshistok->end - msatoshistok->start), |
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buffer + msatoshistok->start); |
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return; |
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} |
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if (!hex_decode(buffer + rhashtok->start, |
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rhashtok->end - rhashtok->start, |
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&rhash, sizeof(rhash))) { |
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command_fail(cmd, "'%.*s' is not a valid sha256 hash", |
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(int)(rhashtok->end - rhashtok->start), |
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buffer + rhashtok->start); |
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return; |
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} |
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/* FIXME: Add fee param, check for excessive fee. */ |
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peer = find_route(cmd->dstate, &id, msatoshis, &fee, &route); |
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if (!peer) { |
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command_fail(cmd, "no route found"); |
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return; |
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} |
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expiry = 0; |
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for (i = tal_count(route) - 1; i >= 0; i--) { |
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expiry += route[i]->delay; |
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if (expiry < route[i]->min_blocks) |
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expiry = route[i]->min_blocks; |
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} |
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expiry += peer->nc->delay; |
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if (expiry < peer->nc->min_blocks) |
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expiry = peer->nc->min_blocks; |
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/* Expiry for HTLCs is absolute. And add one to give some margin. */ |
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expiry += get_block_height(cmd->dstate) + 1; |
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onion = onion_create(cmd, route, msatoshis, fee); |
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pc = tal(cmd, struct pay_command); |
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pc->cmd = cmd; |
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pc->htlc = command_htlc_add(peer, msatoshis + fee, expiry, &rhash, NULL, |
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onion); |
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if (!pc->htlc) { |
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command_fail(cmd, "could not add htlc"); |
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return; |
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} |
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/* Wait until we get response. */ |
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list_add_tail(&peer->pay_commands, &pc->list); |
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tal_add_destructor(pc, remove_from_list); |
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} |
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const struct json_command pay_command = { |
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"pay", |
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json_pay, |
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"Send {id} {msatoshis} in return for preimage of {rhash}", |
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"Returns an empty result on success" |
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}; |
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@ -0,0 +1,13 @@ |
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#ifndef LIGHTNING_DAEMON_PAY_H |
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#define LIGHTNING_DAEMON_PAY_H |
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#include "config.h" |
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struct peer; |
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struct htlc; |
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struct rval; |
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void complete_pay_command(struct peer *peer, |
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struct htlc *htlc, |
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const struct rval *rval); |
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#endif /* LIGHTNING_DAEMON_PAY_H */ |
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