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pay.c
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pay.c
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#include "pay.h"
#include <ccan/str/hex/hex.h>
#include <ccan/structeq/structeq.h>
#include <ccan/tal/str/str.h>
#include <common/bolt11.h>
#include <common/timeout.h>
#include <gossipd/gen_gossip_wire.h>
#include <lightningd/chaintopology.h>
#include <lightningd/json.h>
#include <lightningd/jsonrpc.h>
#include <lightningd/jsonrpc_errors.h>
#include <lightningd/lightningd.h>
#include <lightningd/log.h>
#include <lightningd/options.h>
#include <lightningd/peer_control.h>
#include <lightningd/peer_htlcs.h>
#include <lightningd/subd.h>
#include <sodium/randombytes.h>
/*-----------------------------------------------------------------------------
Internal sendpay interface
-----------------------------------------------------------------------------*/
/* sendpay command */
struct sendpay_command {
struct list_node list;
struct sha256 payment_hash;
void (*cb)(const struct sendpay_result *, void*);
void *cbarg;
};
static void destroy_sendpay_command(struct sendpay_command *pc)
{
list_del(&pc->list);
}
/* Owned by cxt, if cxt is deleted, then cb will
* no longer be called. */
static void
add_sendpay_waiter(const tal_t *cxt,
const struct sha256 *payment_hash,
struct lightningd *ld,
void (*cb)(const struct sendpay_result *, void*),
void *cbarg)
{
struct sendpay_command *pc = tal(cxt, struct sendpay_command);
pc->payment_hash = *payment_hash;
pc->cb = cb;
pc->cbarg = cbarg;
list_add(&ld->sendpay_commands, &pc->list);
tal_add_destructor(pc, destroy_sendpay_command);
}
/* Owned by cxt; if cxt is deleted, then cb will
* no longer be called. */
static void
add_waitsendpay_waiter(const tal_t *cxt,
const struct sha256 *payment_hash,
struct lightningd *ld,
void (*cb)(const struct sendpay_result *, void*),
void *cbarg)
{
struct sendpay_command *pc = tal(cxt, struct sendpay_command);
pc->payment_hash = *payment_hash;
pc->cb = cb;
pc->cbarg = cbarg;
list_add(&ld->waitsendpay_commands, &pc->list);
tal_add_destructor(pc, destroy_sendpay_command);
}
/* Caller responsible for freeing ctx. */
static void waitsendpay_resolve(const tal_t *ctx,
struct lightningd *ld,
const struct sha256 *payment_hash,
const struct sendpay_result *result)
{
struct sendpay_command *pc;
struct sendpay_command *next;
list_for_each_safe(&ld->waitsendpay_commands, pc, next, list) {
if (!structeq(payment_hash, &pc->payment_hash))
continue;
/* Delete later (in our own caller) if callback did
* not delete. */
tal_steal(ctx, pc);
pc->cb(result, pc->cbarg);
}
}
static struct sendpay_result*
sendpay_result_success(const tal_t *ctx,
const struct preimage *payment_preimage,
const struct wallet_payment *payment)
{
struct sendpay_result *result = tal(ctx, struct sendpay_result);
result->succeeded = true;
result->preimage = *payment_preimage;
result->payment = payment;
return result;
}
static void payment_trigger_success(struct lightningd *ld,
const struct sha256 *payment_hash)
{
struct sendpay_result *result;
struct wallet_payment *payment;
payment = wallet_payment_by_hash(tmpctx, ld->wallet, payment_hash);
assert(payment);
result = sendpay_result_success(tmpctx, payment->payment_preimage, payment);
waitsendpay_resolve(tmpctx, ld, payment_hash, result);
}
static struct sendpay_result*
sendpay_result_route_failure(const tal_t *ctx,
bool retry_plausible,
struct routing_failure *fail,
const u8 *onionreply,
const char *details)
{
struct sendpay_result *result = tal(ctx, struct sendpay_result);
result->succeeded = false;
result->errorcode =
(!fail) ? PAY_UNPARSEABLE_ONION :
(!retry_plausible) ? PAY_DESTINATION_PERM_FAIL :
/*otherwise*/ PAY_TRY_OTHER_ROUTE ;
result->onionreply = onionreply;
result->routing_failure = fail;
result->details = details;
return result;
}
static void payment_route_failure(struct lightningd *ld,
const struct sha256 *payment_hash,
bool retry_plausible,
struct routing_failure *fail,
const u8 *onionreply,
const char *details)
{
struct sendpay_result *result;
result = sendpay_result_route_failure(tmpctx,
retry_plausible,
fail,
onionreply,
details);
waitsendpay_resolve(tmpctx, ld, payment_hash, result);
}
static struct sendpay_result *
sendpay_result_simple_fail(const tal_t *ctx,
int errorcode,
char const *details)
{
struct sendpay_result *result = tal(ctx, struct sendpay_result);
result->succeeded = false;
result->errorcode = errorcode;
result->details = details;
return result;
}
static struct sendpay_result *
sendpay_result_in_progress(const tal_t *ctx,
const struct wallet_payment* payment,
char const *details)
{
struct sendpay_result *result = tal(ctx, struct sendpay_result);
result->succeeded = false;
result->errorcode = PAY_IN_PROGRESS;
result->payment = payment;
result->details = details;
return result;
}
void payment_succeeded(struct lightningd *ld, struct htlc_out *hout,
const struct preimage *rval)
{
wallet_payment_set_status(ld->wallet, &hout->payment_hash,
PAYMENT_COMPLETE, rval);
payment_trigger_success(ld, &hout->payment_hash);
}
/* Return NULL if the wrapped onion error message has no
* channel_update field, or return the embedded
* channel_update message otherwise. */
static u8 *channel_update_from_onion_error(const tal_t *ctx,
const u8 *onion_message)
{
u8 *channel_update = NULL;
u64 unused64;
u32 unused32;
/* Identify failcodes that have some channel_update.
*
* TODO > BOLT 1.0: Add new failcodes when updating to a
* new BOLT version. */
if (!fromwire_temporary_channel_failure(ctx,
onion_message,
&channel_update) &&
!fromwire_amount_below_minimum(ctx,
onion_message, &unused64,
&channel_update) &&
!fromwire_fee_insufficient(ctx,
onion_message, &unused64,
&channel_update) &&
!fromwire_incorrect_cltv_expiry(ctx,
onion_message, &unused32,
&channel_update) &&
!fromwire_expiry_too_soon(ctx,
onion_message,
&channel_update))
/* No channel update. */
channel_update = NULL;
return channel_update;
}
/* Return a struct routing_failure for an immediate failure
* (returned directly from send_htlc_out). The returned
* failure is allocated from the given context. */
static struct routing_failure*
immediate_routing_failure(const tal_t *ctx,
const struct lightningd *ld,
enum onion_type failcode,
const struct short_channel_id *channel0)
{
struct routing_failure *routing_failure;
assert(failcode);
routing_failure = tal(ctx, struct routing_failure);
routing_failure->erring_index = 0;
routing_failure->failcode = failcode;
routing_failure->erring_node = ld->id;
routing_failure->erring_channel = *channel0;
routing_failure->channel_update = NULL;
return routing_failure;
}
/* Return a struct routing_failure for a local failure allocated
* from the given context. */
static struct routing_failure*
local_routing_failure(const tal_t *ctx,
const struct lightningd *ld,
const struct htlc_out *hout,
const struct wallet_payment *payment)
{
struct routing_failure *routing_failure;
assert(hout->failcode);
routing_failure = tal(ctx, struct routing_failure);
routing_failure->erring_index = 0;
routing_failure->failcode = hout->failcode;
routing_failure->erring_node = ld->id;
routing_failure->erring_channel = payment->route_channels[0];
routing_failure->channel_update = NULL;
return routing_failure;
}
/* Return false if permanent failure at the destination, true if
* retrying is plausible. Fill *routing_failure with NULL if
* we cannot report the remote failure, or with the routing
* failure to report (allocated from ctx) otherwise. */
static struct routing_failure*
remote_routing_failure(const tal_t *ctx,
bool *p_retry_plausible,
bool *p_report_to_gossipd,
const struct wallet_payment *payment,
const struct onionreply *failure)
{
enum onion_type failcode = fromwire_peektype(failure->msg);
u8 *channel_update;
struct routing_failure *routing_failure;
const struct pubkey *route_nodes;
const struct pubkey *erring_node;
const struct short_channel_id *route_channels;
const struct short_channel_id *erring_channel;
static const struct short_channel_id dummy_channel = { 0 };
int origin_index;
bool retry_plausible;
bool report_to_gossipd;
routing_failure = tal(ctx, struct routing_failure);
route_nodes = payment->route_nodes;
route_channels = payment->route_channels;
origin_index = failure->origin_index;
channel_update
= channel_update_from_onion_error(routing_failure,
failure->msg);
retry_plausible = true;
report_to_gossipd = true;
assert(origin_index < tal_count(route_nodes));
/* Check if at destination. */
if (origin_index == tal_count(route_nodes) - 1) {
erring_channel = &dummy_channel;
/* BOLT #4:
*
* - if the _final node_ is returning the error:
* - if the PERM bit is set:
* - SHOULD fail the payment.
* */
if (failcode & PERM)
retry_plausible = false;
else
retry_plausible = true;
/* Only send message to gossipd if NODE error;
* there is no "next" channel to report as
* failing if this is the last node. */
if (failcode & NODE)
report_to_gossipd = true;
else
report_to_gossipd = false;
} else
/* Report the *next* channel as failing. */
erring_channel = &route_channels[origin_index + 1];
erring_node = &route_nodes[origin_index];
routing_failure->erring_index = (unsigned int) (origin_index + 1);
routing_failure->failcode = failcode;
routing_failure->erring_node = *erring_node;
routing_failure->erring_channel = *erring_channel;
routing_failure->channel_update = channel_update;
*p_retry_plausible = retry_plausible;
*p_report_to_gossipd = report_to_gossipd;
return routing_failure;
}
static void random_mark_channel_unroutable(struct log *log,
struct subd *gossip,
struct short_channel_id *route_channels)
{
size_t num_channels = tal_count(route_channels);
size_t i;
const struct short_channel_id *channel;
u8 *msg;
assert(num_channels != 0);
/* Select one channel by random. */
randombytes_buf(&i, sizeof(i));
i = i % num_channels;
channel = &route_channels[i];
log_debug(log,
"Disable randomly %dth channel (%s) along route "
"(guessing due to bad reply)",
(int) i,
type_to_string(tmpctx, struct short_channel_id,
channel));
msg = towire_gossip_mark_channel_unroutable(tmpctx, channel);
subd_send_msg(gossip, msg);
}
static void report_routing_failure(struct log *log,
struct subd *gossip,
struct routing_failure *fail)
{
u8 *gossip_msg;
assert(fail);
log_debug(log,
"Reporting route failure to gossipd: 0x%04x (%s) "
"node %s channel %s update %s",
fail->failcode, onion_type_name(fail->failcode),
type_to_string(tmpctx, struct pubkey,
&fail->erring_node),
type_to_string(tmpctx, struct short_channel_id,
&fail->erring_channel),
tal_hex(tmpctx, fail->channel_update));
gossip_msg = towire_gossip_routing_failure(tmpctx,
&fail->erring_node,
&fail->erring_channel,
(u16) fail->failcode,
fail->channel_update);
subd_send_msg(gossip, gossip_msg);
}
void payment_store(struct lightningd *ld,
const struct sha256 *payment_hash)
{
struct sendpay_command *pc;
struct sendpay_command *next;
struct sendpay_result *result;
const struct wallet_payment *payment;
wallet_payment_store(ld->wallet, payment_hash);
payment = wallet_payment_by_hash(tmpctx, ld->wallet, payment_hash);
assert(payment);
/* Invent a sendpay result with PAY_IN_PROGRESS. */
result = sendpay_result_in_progress(tmpctx, payment,
"Payment is still in progress");
/* Trigger any sendpay commands waiting for the store to occur. */
list_for_each_safe(&ld->sendpay_commands, pc, next, list) {
if (!structeq(payment_hash, &pc->payment_hash))
continue;
/* Delete later if callback did not delete. */
tal_steal(tmpctx, pc);
pc->cb(result, pc->cbarg);
}
}
void payment_failed(struct lightningd *ld, const struct htlc_out *hout,
const char *localfail)
{
struct wallet_payment *payment;
struct routing_failure* fail = NULL;
const char *failmsg;
bool retry_plausible;
bool report_to_gossipd;
payment = wallet_payment_by_hash(tmpctx, ld->wallet,
&hout->payment_hash);
#ifdef COMPAT_V052
/* Prior to "pay: delete HTLC when we delete payment." we would
* delete a payment on retry, but leave the HTLC. */
if (!payment) {
log_unusual(hout->key.channel->log,
"No payment for %s:"
" was this an old database?",
type_to_string(tmpctx, struct sha256,
&hout->payment_hash));
return;
}
/* FIXME: Prior to 299b280f7, we didn't put route_nodes and
* route_channels in db. If this happens, it's an old payment,
* so we can simply mark it failed in db and return. */
if (!payment->route_channels) {
log_unusual(hout->key.channel->log,
"No route_channels for htlc %s:"
" was this an old database?",
type_to_string(tmpctx, struct sha256,
&hout->payment_hash));
wallet_payment_set_status(ld->wallet, &hout->payment_hash,
PAYMENT_FAILED, NULL);
return;
}
#endif
/* This gives more details than a generic failure message */
if (localfail) {
fail = local_routing_failure(tmpctx, ld, hout, payment);
failmsg = localfail;
retry_plausible = true;
report_to_gossipd = true;
} else {
/* Must be remote fail. */
assert(!hout->failcode);
failmsg = "reply from remote";
/* Try to parse reply. */
struct secret *path_secrets = payment->path_secrets;
struct onionreply *reply = unwrap_onionreply(tmpctx, path_secrets,
tal_count(path_secrets),
hout->failuremsg);
if (!reply) {
log_info(hout->key.channel->log,
"htlc %"PRIu64" failed with bad reply (%s)",
hout->key.id,
tal_hex(tmpctx, hout->failuremsg));
/* Cannot report failure. */
fail = NULL;
/* Select a channel to mark unroutable by random */
random_mark_channel_unroutable(hout->key.channel->log,
ld->gossip,
payment->route_channels);
/* Can now retry; we selected a channel to mark
* unroutable by random */
retry_plausible = true;
/* Already reported something to gossipd, do not
* report anything else */
report_to_gossipd = false;
} else {
enum onion_type failcode = fromwire_peektype(reply->msg);
log_info(hout->key.channel->log,
"htlc %"PRIu64" "
"failed from %ith node "
"with code 0x%04x (%s)",
hout->key.id,
reply->origin_index,
failcode, onion_type_name(failcode));
fail = remote_routing_failure(tmpctx,
&retry_plausible,
&report_to_gossipd,
payment, reply);
}
}
/* Save to DB */
payment_store(ld, &hout->payment_hash);
wallet_payment_set_status(ld->wallet, &hout->payment_hash,
PAYMENT_FAILED, NULL);
wallet_payment_set_failinfo(ld->wallet,
&hout->payment_hash,
fail ? NULL : hout->failuremsg,
(fail && !retry_plausible),
fail ? fail->erring_index : -1,
fail ? fail->failcode : 0,
fail ? &fail->erring_node : NULL,
fail ? &fail->erring_channel : NULL,
fail ? fail->channel_update : NULL,
failmsg);
/* Report to gossipd if we decided we should. */
if (report_to_gossipd)
report_routing_failure(ld->log, ld->gossip, fail);
/* Report to client. */
payment_route_failure(ld, &hout->payment_hash,
retry_plausible, fail, hout->failuremsg,
failmsg);
}
/* Wait for a payment. If cxt is deleted, then cb will
* no longer be called.
* Return false if we called callback already, true if
* callback is scheduled for later. */
bool wait_payment(const tal_t *cxt,
struct lightningd *ld,
const struct sha256 *payment_hash,
void (*cb)(const struct sendpay_result *, void*),
void *cbarg)
{
struct wallet_payment *payment;
struct sendpay_result *result;
char const *details;
bool cb_not_called;
u8 *failonionreply;
bool faildestperm;
int failindex;
enum onion_type failcode;
struct pubkey *failnode;
struct short_channel_id *failchannel;
u8 *failupdate;
char *faildetail;
struct routing_failure *fail;
payment = wallet_payment_by_hash(tmpctx, ld->wallet, payment_hash);
if (!payment) {
details = tal_fmt(tmpctx,
"Never attempted payment for '%s'",
type_to_string(tmpctx, struct sha256,
payment_hash));
result = sendpay_result_simple_fail(tmpctx,
PAY_NO_SUCH_PAYMENT,
details);
cb(result, cbarg);
cb_not_called = false;
goto end;
}
switch (payment->status) {
case PAYMENT_PENDING:
add_waitsendpay_waiter(cxt, payment_hash, ld, cb, cbarg);
cb_not_called = true;
goto end;
case PAYMENT_COMPLETE:
result = sendpay_result_success(tmpctx,
payment->payment_preimage,
payment);
cb(result, cbarg);
cb_not_called = false;
goto end;
case PAYMENT_FAILED:
/* Get error from DB */
wallet_payment_get_failinfo(tmpctx, ld->wallet, payment_hash,
&failonionreply,
&faildestperm,
&failindex,
&failcode,
&failnode,
&failchannel,
&failupdate,
&faildetail);
/* Old DB might not save failure information */
if (!failonionreply && !failnode)
result = sendpay_result_simple_fail(tmpctx,
PAY_UNSPECIFIED_ERROR,
"Payment failure reason unknown");
else if (failonionreply) {
/* failed to parse returned onion error */
result = sendpay_result_route_failure(tmpctx, true, NULL, failonionreply, faildetail);
} else {
/* Parsed onion error, get its details */
assert(failnode);
assert(failchannel);
fail = tal(tmpctx, struct routing_failure);
fail->erring_index = failindex;
fail->failcode = failcode;
fail->erring_node = *failnode;
fail->erring_channel = *failchannel;
fail->channel_update = failupdate;
result = sendpay_result_route_failure(tmpctx, !faildestperm, fail, NULL, faildetail);
}
cb(result, cbarg);
cb_not_called = false;
goto end;
}
/* Impossible. */
abort();
end:
return cb_not_called;
}
/* Returns false if cb was called, true if cb not yet called. */
bool
send_payment(const tal_t *ctx,
struct lightningd* ld,
const struct sha256 *rhash,
const struct route_hop *route,
u64 msatoshi,
void (*cb)(const struct sendpay_result *, void*),
void *cbarg)
{
const u8 *onion;
u8 sessionkey[32];
unsigned int base_expiry;
struct onionpacket *packet;
struct secret *path_secrets;
enum onion_type failcode;
size_t i, n_hops = tal_count(route);
struct hop_data *hop_data = tal_arr(tmpctx, struct hop_data, n_hops);
struct pubkey *ids = tal_arr(tmpctx, struct pubkey, n_hops);
struct wallet_payment *payment = NULL;
struct htlc_out *hout;
struct short_channel_id *channels;
struct routing_failure *fail;
struct channel *channel;
struct sendpay_result *result;
/* Expiry for HTLCs is absolute. And add one to give some margin. */
base_expiry = get_block_height(ld->topology) + 1;
/* Extract IDs for each hop: create_onionpacket wants array. */
for (i = 0; i < n_hops; i++)
ids[i] = route[i].nodeid;
/* Copy hop_data[n] from route[n+1] (ie. where it goes next) */
for (i = 0; i < n_hops - 1; i++) {
hop_data[i].realm = 0;
hop_data[i].channel_id = route[i+1].channel_id;
hop_data[i].amt_forward = route[i+1].amount;
hop_data[i].outgoing_cltv = base_expiry + route[i+1].delay;
}
/* And finally set the final hop to the special values in
* BOLT04 */
hop_data[i].realm = 0;
hop_data[i].outgoing_cltv = base_expiry + route[i].delay;
memset(&hop_data[i].channel_id, 0, sizeof(struct short_channel_id));
hop_data[i].amt_forward = route[i].amount;
/* Now, do we already have a payment? */
payment = wallet_payment_by_hash(tmpctx, ld->wallet, rhash);
if (payment) {
/* FIXME: We should really do something smarter here! */
log_debug(ld->log, "send_payment: found previous");
if (payment->status == PAYMENT_PENDING) {
log_add(ld->log, "Payment is still in progress");
result = sendpay_result_in_progress(tmpctx,
payment,
"Payment is still in progress");
cb(result, cbarg);
return false;
}
if (payment->status == PAYMENT_COMPLETE) {
log_add(ld->log, "... succeeded");
/* Must match successful payment parameters. */
if (payment->msatoshi != msatoshi) {
char *msg = tal_fmt(tmpctx,
"Already succeeded "
"with amount %"PRIu64,
payment->msatoshi);
result = sendpay_result_simple_fail(tmpctx,
PAY_RHASH_ALREADY_USED,
msg);
cb(result, cbarg);
return false;
}
if (!structeq(&payment->destination, &ids[n_hops-1])) {
char *msg = tal_fmt(tmpctx,
"Already succeeded to %s",
type_to_string(tmpctx,
struct pubkey,
&payment->destination));
result = sendpay_result_simple_fail(tmpctx,
PAY_RHASH_ALREADY_USED,
msg);
cb(result, cbarg);
return false;
}
result = sendpay_result_success(tmpctx,
payment->payment_preimage,
payment);
cb(result, cbarg);
return false;
}
log_add(ld->log, "... retrying");
}
channel = active_channel_by_id(ld, &ids[0], NULL);
if (!channel) {
/* Report routing failure to gossipd */
fail = immediate_routing_failure(ctx, ld,
WIRE_UNKNOWN_NEXT_PEER,
&route[0].channel_id);
report_routing_failure(ld->log, ld->gossip, fail);
/* Report routing failure to caller */
result = sendpay_result_route_failure(tmpctx, true, fail, NULL,
"No connection to first "
"peer found");
cb(result, cbarg);
return false;
}
randombytes_buf(&sessionkey, sizeof(sessionkey));
/* Onion will carry us from first peer onwards. */
packet = create_onionpacket(tmpctx, ids, hop_data, sessionkey, rhash->u.u8,
sizeof(struct sha256), &path_secrets);
onion = serialize_onionpacket(tmpctx, packet);
log_info(ld->log, "Sending %"PRIu64" over %zu hops to deliver %"PRIu64"",
route[0].amount, n_hops, msatoshi);
failcode = send_htlc_out(channel, route[0].amount,
base_expiry + route[0].delay,
rhash, onion, NULL, &hout);
if (failcode) {
/* Report routing failure to gossipd */
fail = immediate_routing_failure(ctx, ld,
failcode,
&route[0].channel_id);
report_routing_failure(ld->log, ld->gossip, fail);
/* Report routing failure to caller */
result = sendpay_result_route_failure(tmpctx, true, fail, NULL,
"First peer not ready");
cb(result, cbarg);
return false;
}
/* Copy channels used along the route. */
channels = tal_arr(tmpctx, struct short_channel_id, n_hops);
for (i = 0; i < n_hops; ++i)
channels[i] = route[i].channel_id;
/* If we're retrying, delete all trace of previous one. We delete
* outgoing HTLC, too, otherwise it gets reported to onchaind as
* a possibility, and we end up in handle_missing_htlc_output->
* onchain_failed_our_htlc->payment_failed with no payment.
*/
if (payment) {
wallet_payment_delete(ld->wallet, rhash);
wallet_local_htlc_out_delete(ld->wallet, channel, rhash);
}
/* If hout fails, payment should be freed too. */
payment = tal(hout, struct wallet_payment);
payment->id = 0;
payment->payment_hash = *rhash;
payment->destination = ids[n_hops - 1];
payment->status = PAYMENT_PENDING;
payment->msatoshi = msatoshi;
payment->msatoshi_sent = route[0].amount;
payment->timestamp = time_now().ts.tv_sec;
payment->payment_preimage = NULL;
payment->path_secrets = tal_steal(payment, path_secrets);
payment->route_nodes = tal_steal(payment, ids);
payment->route_channels = tal_steal(payment, channels);
/* We write this into db when HTLC is actually sent. */
wallet_payment_setup(ld->wallet, payment);
add_sendpay_waiter(ctx, rhash, ld, cb, cbarg);
return true;
}
/*-----------------------------------------------------------------------------
JSON-RPC sendpay interface
-----------------------------------------------------------------------------*/
static void
json_sendpay_success(struct command *cmd,
const struct sendpay_result *r)
{
struct json_result *response;
assert(r->payment->status == PAYMENT_COMPLETE);
response = new_json_result(cmd);
json_object_start(response, NULL);
json_add_payment_fields(response, r->payment);
json_object_end(response);
command_success(cmd, response);
}
static void json_waitsendpay_on_resolve(const struct sendpay_result *r,
void *vcmd)
{
struct command *cmd = (struct command*) vcmd;
struct json_result *data = NULL;
const char *msg = NULL;
struct routing_failure *fail;
if (r->succeeded)
json_sendpay_success(cmd, r);
else {
switch (r->errorcode) {
/* We will never handle this case */
case PAY_IN_PROGRESS:
abort();
case PAY_RHASH_ALREADY_USED:
case PAY_UNSPECIFIED_ERROR:
case PAY_NO_SUCH_PAYMENT:
data = NULL;
msg = r->details;
break;
case PAY_UNPARSEABLE_ONION:
data = new_json_result(cmd);
json_object_start(data, NULL);
json_add_hex(data, "onionreply",
r->onionreply, tal_len(r->onionreply));
json_object_end(data);
assert(r->details != NULL);
msg = tal_fmt(cmd,
"failed: WIRE_PERMANENT_NODE_FAILURE "
"(%s)",
r->details);
break;
case PAY_DESTINATION_PERM_FAIL:
case PAY_TRY_OTHER_ROUTE:
fail = r->routing_failure;
data = new_json_result(cmd);
json_object_start(data, NULL);
json_add_num(data, "erring_index",
fail->erring_index);
json_add_num(data, "failcode",
(unsigned) fail->failcode);
json_add_pubkey(data, "erring_node", &fail->erring_node);
json_add_short_channel_id(data, "erring_channel",
&fail->erring_channel);
if (fail->channel_update)
json_add_hex(data, "channel_update",
fail->channel_update,
tal_len(fail->channel_update));
json_object_end(data);
assert(r->details != NULL);
msg = tal_fmt(cmd,
"failed: %s (%s)",
onion_type_name(fail->failcode),
r->details);
break;
}
assert(msg);
command_fail_detailed(cmd, r->errorcode, data, "%s", msg);
}
}
static void json_sendpay_on_resolve(const struct sendpay_result* r,
void *vcmd)
{
struct command *cmd = (struct command*) vcmd;
if (!r->succeeded && r->errorcode == PAY_IN_PROGRESS) {
/* This is normal for sendpay. Succeed. */
struct json_result *response = new_json_result(cmd);
json_object_start(response, NULL);
json_add_string(response, "message",
"Monitor status with listpayments or waitsendpay");
json_add_payment_fields(response, r->payment);
json_object_end(response);
command_success(cmd, response);
} else
json_waitsendpay_on_resolve(r, cmd);
}
static void json_sendpay(struct command *cmd,
const char *buffer, const jsmntok_t *params)
{
jsmntok_t *routetok, *rhashtok;
jsmntok_t *msatoshitok;
const jsmntok_t *t, *end;
size_t n_hops;
struct sha256 rhash;
struct route_hop *route;
u64 msatoshi;
if (!json_get_params(cmd, buffer, params,
"route", &routetok,
"payment_hash", &rhashtok,
"?msatoshi", &msatoshitok,
NULL)) {
return;
}
if (!hex_decode(buffer + rhashtok->start,
rhashtok->end - rhashtok->start,
&rhash, sizeof(rhash))) {
command_fail(cmd, "'%.*s' is not a valid sha256 hash",
rhashtok->end - rhashtok->start,
buffer + rhashtok->start);
return;
}
if (routetok->type != JSMN_ARRAY) {
command_fail(cmd, "'%.*s' is not an array",
routetok->end - routetok->start,
buffer + routetok->start);
return;
}
end = json_next(routetok);
n_hops = 0;
route = tal_arr(cmd, struct route_hop, n_hops);
for (t = routetok + 1; t < end; t = json_next(t)) {
const jsmntok_t *amttok, *idtok, *delaytok, *chantok;
if (t->type != JSMN_OBJECT) {
command_fail(cmd, "Route %zu '%.*s' is not an object",
n_hops,
t->end - t->start,
buffer + t->start);
return;
}
amttok = json_get_member(buffer, t, "msatoshi");
idtok = json_get_member(buffer, t, "id");
delaytok = json_get_member(buffer, t, "delay");
chantok = json_get_member(buffer, t, "channel");
if (!amttok || !idtok || !delaytok || !chantok) {
command_fail(cmd, "Route %zu needs msatoshi/id/channel/delay",
n_hops);
return;
}
tal_resize(&route, n_hops + 1);
/* What that hop will forward */
if (!json_tok_u64(buffer, amttok, &route[n_hops].amount)) {
command_fail(cmd, "Route %zu invalid msatoshi",
n_hops);
return;
}
if (!json_tok_short_channel_id(buffer, chantok,
&route[n_hops].channel_id)) {
command_fail(cmd, "Route %zu invalid channel_id", n_hops);
return;
}
if (!json_tok_pubkey(buffer, idtok, &route[n_hops].nodeid)) {
command_fail(cmd, "Route %zu invalid id", n_hops);
return;
}
if (!json_tok_number(buffer, delaytok, &route[n_hops].delay)) {
command_fail(cmd, "Route %zu invalid delay", n_hops);
return;
}
n_hops++;
}
if (n_hops == 0) {
command_fail(cmd, "Empty route");
return;
}