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pay.c
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#include "config.h"
#include <ccan/json_escape/json_escape.h>
#include <ccan/mem/mem.h>
#include <ccan/tal/str/str.h>
#include <common/bolt12_merkle.h>
#include <common/configdir.h>
#include <common/json_command.h>
#include <common/json_param.h>
#include <common/onionreply.h>
#include <common/route.h>
#include <common/timeout.h>
#include <lightningd/chaintopology.h>
#include <lightningd/channel.h>
#include <lightningd/invoice.h>
#include <lightningd/notification.h>
#include <lightningd/pay.h>
#include <lightningd/peer_control.h>
#include <lightningd/peer_htlcs.h>
#include <wallet/invoices.h>
/* Routing failure object */
struct routing_failure {
unsigned int erring_index;
enum onion_wire failcode;
const struct node_id *erring_node;
const struct short_channel_id *erring_channel;
int channel_dir;
/* If remote sent us a message, this is it. */
const u8 *msg;
};
/* waitsendpay command */
struct waitsendpay_command {
struct list_node list;
struct sha256 payment_hash;
u64 partid;
u64 groupid;
struct command *cmd;
};
static bool string_to_payment_status(const char *status_str, size_t len,
enum payment_status *status)
{
if (memeqstr(status_str, len, "complete")) {
*status = PAYMENT_COMPLETE;
return true;
} else if (memeqstr(status_str, len, "pending")) {
*status = PAYMENT_PENDING;
return true;
} else if (memeqstr(status_str, len, "failed")) {
*status = PAYMENT_FAILED;
return true;
}
return false;
}
static const char *payment_status_to_string(const enum payment_status status)
{
switch (status) {
case PAYMENT_COMPLETE:
return "complete";
case PAYMENT_FAILED:
return "failed";
case PAYMENT_PENDING:
return "pending";
}
//This should never happen
abort();
}
static void destroy_waitsendpay_command(struct waitsendpay_command *pc)
{
list_del(&pc->list);
}
/* Owned by cmd, if cmd is deleted, then sendpay_success/sendpay_fail will
* no longer be called. */
static void
add_waitsendpay_waiter(struct lightningd *ld,
struct command *cmd,
const struct sha256 *payment_hash,
u64 partid, u64 groupid)
{
struct waitsendpay_command *pc = tal(cmd, struct waitsendpay_command);
pc->payment_hash = *payment_hash;
pc->partid = partid;
pc->groupid = groupid;
pc->cmd = cmd;
list_add(&ld->waitsendpay_commands, &pc->list);
tal_add_destructor(pc, destroy_waitsendpay_command);
}
/* Outputs fields, not a separate object*/
void json_add_payment_fields(struct json_stream *response,
const struct wallet_payment *t)
{
json_add_u64(response, "created_index", t->id);
json_add_u64(response, "id", t->id);
json_add_sha256(response, "payment_hash", &t->payment_hash);
json_add_u64(response, "groupid", t->groupid);
if (t->updated_index)
json_add_u64(response, "updated_index", t->updated_index);
if (t->partid)
json_add_u64(response, "partid", t->partid);
if (t->destination != NULL)
json_add_node_id(response, "destination", t->destination);
/* If we have a 0 amount delivered at the remote end we simply don't
* know since the onion was generated externally. */
if (amount_msat_greater(t->msatoshi, AMOUNT_MSAT(0)))
json_add_amount_msat(response, "amount_msat", t->msatoshi);
json_add_amount_msat(response, "amount_sent_msat", t->msatoshi_sent);
json_add_u32(response, "created_at", t->timestamp);
if (t->completed_at)
json_add_u32(response, "completed_at", *t->completed_at);
switch (t->status) {
case PAYMENT_PENDING:
json_add_string(response, "status", "pending");
break;
case PAYMENT_COMPLETE:
json_add_string(response, "status", "complete");
break;
case PAYMENT_FAILED:
json_add_string(response, "status", "failed");
break;
}
if (t->payment_preimage)
json_add_preimage(response, "payment_preimage",
t->payment_preimage);
if (t->label)
json_add_string(response, "label", t->label);
if (t->invstring) {
if (strstarts(t->invstring, "lni"))
json_add_string(response, "bolt12", t->invstring);
else
json_add_string(response, "bolt11", t->invstring);
}
if (t->description)
json_add_string(response, "description", t->description);
if (t->failonion)
json_add_hex(response, "erroronion", t->failonion,
tal_count(t->failonion));
}
static struct command_result *sendpay_success(struct command *cmd,
const struct wallet_payment *payment)
{
struct json_stream *response;
assert(payment->status == PAYMENT_COMPLETE);
response = json_stream_success(cmd);
json_add_payment_fields(response, payment);
return command_success(cmd, response);
}
static void
json_add_routefail_info(struct json_stream *js,
unsigned int erring_index,
enum onion_wire failcode,
const struct node_id *erring_node,
const struct short_channel_id *erring_channel,
int channel_dir,
const u8 *msg)
{
const char *failcodename = onion_wire_name(failcode);
json_add_num(js, "erring_index", erring_index);
json_add_num(js, "failcode", failcode);
/* FIXME: Better way to detect this? */
if (!strstarts(failcodename, "INVALID "))
json_add_string(js, "failcodename", failcodename);
if (erring_node != NULL)
json_add_node_id(js, "erring_node", erring_node);
if (erring_channel != NULL) {
json_add_short_channel_id(js, "erring_channel", *erring_channel);
json_add_num(js, "erring_direction", channel_dir);
}
if (msg)
json_add_hex_talarr(js, "raw_message", msg);
}
void json_sendpay_fail_fields(struct json_stream *js,
const struct wallet_payment *payment,
enum jsonrpc_errcode pay_errcode,
const struct onionreply *onionreply,
const struct routing_failure *fail)
{
/* "immediate_routing_failure" is before payment creation. */
if (payment)
json_add_payment_fields(js, payment);
if (pay_errcode == PAY_UNPARSEABLE_ONION && onionreply)
json_add_hex_talarr(js, "onionreply", onionreply->contents);
else if (fail)
json_add_routefail_info(js,
fail->erring_index,
fail->failcode,
fail->erring_node,
fail->erring_channel,
fail->channel_dir,
fail->msg);
}
static const char *sendpay_errmsg_fmt(const tal_t *ctx, enum jsonrpc_errcode pay_errcode,
const struct routing_failure *fail,
const char *details)
{
char *errmsg;
if (pay_errcode == PAY_UNPARSEABLE_ONION)
errmsg = "Malformed error reply";
else {
assert(fail);
errmsg = tal_fmt(ctx, "failed: %s (%s)",
onion_wire_name(fail->failcode), details);
}
return errmsg;
}
/* onionreply used if pay_errcode == PAY_UNPARSEABLE_ONION */
static struct command_result *
sendpay_fail(struct command *cmd,
const struct wallet_payment *payment,
enum jsonrpc_errcode pay_errcode,
const struct onionreply *onionreply,
const struct routing_failure *fail,
const char *errmsg)
{
struct json_stream *data;
data = json_stream_fail(cmd, pay_errcode,
errmsg);
json_sendpay_fail_fields(data,
payment,
pay_errcode,
onionreply,
fail);
json_object_end(data);
return command_failed(cmd, data);
}
/* We defer sendpay "success" until we know it's pending; consumes cmd */
static struct command_result *
json_sendpay_in_progress(struct command *cmd,
const struct wallet_payment *payment)
{
struct json_stream *response = json_stream_success(cmd);
json_add_string(response, "message",
"Monitor status with listpays or waitsendpay");
json_add_payment_fields(response, payment);
return command_success(cmd, response);
}
static void tell_waiters_failed(struct lightningd *ld,
const struct sha256 *payment_hash,
const struct wallet_payment *payment,
enum jsonrpc_errcode pay_errcode,
const struct onionreply *onionreply,
const struct routing_failure *fail,
const char *details)
{
struct waitsendpay_command *pc;
struct waitsendpay_command *next;
const char *errmsg =
sendpay_errmsg_fmt(tmpctx, pay_errcode, fail, details);
/* Careful: sendpay_fail deletes cmd */
list_for_each_safe(&ld->waitsendpay_commands, pc, next, list) {
if (!sha256_eq(payment_hash, &pc->payment_hash))
continue;
if (payment->partid != pc->partid)
continue;
if (payment->groupid != pc->groupid)
continue;
sendpay_fail(pc->cmd, payment, pay_errcode, onionreply, fail,
errmsg);
}
notify_sendpay_failure(ld,
payment,
pay_errcode,
onionreply,
fail,
errmsg);
}
static void tell_waiters_success(struct lightningd *ld,
const struct sha256 *payment_hash,
struct wallet_payment *payment)
{
struct waitsendpay_command *pc;
struct waitsendpay_command *next;
/* Careful: sendpay_success deletes cmd */
list_for_each_safe(&ld->waitsendpay_commands, pc, next, list) {
if (!sha256_eq(payment_hash, &pc->payment_hash))
continue;
if (payment->partid != pc->partid)
continue;
if (payment->groupid != pc->groupid)
continue;
sendpay_success(pc->cmd, payment);
}
notify_sendpay_success(ld, payment);
}
void payment_succeeded(struct lightningd *ld,
const struct sha256 *payment_hash,
u64 partid, u64 groupid,
const struct preimage *rval)
{
struct wallet_payment *payment;
wallet_payment_set_status(ld->wallet, payment_hash,
partid, groupid,
PAYMENT_COMPLETE, rval);
payment = wallet_payment_by_hash(tmpctx, ld->wallet,
payment_hash,
partid, groupid);
assert(payment);
if (payment->local_invreq_id)
wallet_invoice_request_mark_used(ld->wallet->db,
payment->local_invreq_id);
tell_waiters_success(ld, payment_hash, payment);
}
/* 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_wire failcode,
struct short_channel_id channel0,
const struct node_id *dstid)
{
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 =
tal_dup(routing_failure, struct node_id, &ld->id);
routing_failure->erring_channel =
tal_dup(routing_failure, struct short_channel_id, &channel0);
routing_failure->channel_dir = node_id_idx(&ld->id, dstid);
routing_failure->msg = 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,
enum onion_wire failcode,
const struct wallet_payment *payment)
{
struct routing_failure *routing_failure;
routing_failure = tal(ctx, struct routing_failure);
routing_failure->erring_index = 0;
routing_failure->failcode = failcode;
routing_failure->erring_node =
tal_dup(routing_failure, struct node_id, &ld->id);
if (payment->route_nodes != NULL && payment->route_channels != NULL) {
routing_failure->erring_channel =
tal_dup(routing_failure, struct short_channel_id,
&payment->route_channels[0]);
routing_failure->channel_dir =
node_id_idx(&ld->id, &payment->route_nodes[0]);
} else {
routing_failure->erring_channel = NULL;
}
routing_failure->msg = NULL;
log_debug(hout->key.channel->log, "local_routing_failure: %u (%s)",
routing_failure->failcode,
onion_wire_name(routing_failure->failcode));
return routing_failure;
}
/* Fills in *pay_errcode with PAY_TRY_OTHER_ROUTE or PAY_DESTINATION_PERM_FAIL */
static struct routing_failure*
remote_routing_failure(const tal_t *ctx,
struct lightningd *ld,
const struct wallet_payment *payment,
const u8 *failuremsg,
int origin_index,
struct logger *log,
enum jsonrpc_errcode *pay_errcode)
{
enum onion_wire failcode = fromwire_peektype(failuremsg);
struct routing_failure *routing_failure;
const struct node_id *route_nodes;
const struct node_id *erring_node;
const struct short_channel_id *route_channels;
const struct short_channel_id *erring_channel;
int dir;
routing_failure = tal(ctx, struct routing_failure);
route_nodes = payment->route_nodes;
route_channels = payment->route_channels;
assert(route_nodes == NULL || origin_index < tal_count(route_nodes));
/* Either we have both channels and nodes, or neither */
assert((route_nodes == NULL) == (route_channels == NULL));
if (route_nodes == NULL) {
/* This means we have the `shared_secrets`, but cannot infer
* the erring channel and node since we don't have them. This
* can happen if the payment was initialized using `sendonion`
* and the `shared_secrets` where specified. */
dir = 0;
erring_channel = NULL;
erring_node = NULL;
/* We don't know if there's another route, that'd depend on
* where the failure occured and whether it was a node
* failure. Let's assume it wasn't a terminal one, and have
* the sendonion caller deal with the actual decision. */
*pay_errcode = PAY_TRY_OTHER_ROUTE;
} else if (origin_index == tal_count(route_nodes) - 1) {
/* If any channel is to blame, it's the last one. */
erring_channel = &route_channels[origin_index];
/* Single hop? */
if (origin_index == 0)
dir = node_id_idx(&ld->id,
&route_nodes[origin_index]);
else
dir = node_id_idx(&route_nodes[origin_index - 1],
&route_nodes[origin_index]);
/* BOLT #4:
*
* - if the _final node_ is returning the error:
* - if the PERM bit is set:
* - SHOULD fail the payment.
* */
if (failcode & BADONION)
*pay_errcode = PAY_UNPARSEABLE_ONION;
else if (failcode & PERM)
*pay_errcode = PAY_DESTINATION_PERM_FAIL;
else
/* FIXME: not right for WIRE_FINAL_EXPIRY_TOO_SOON */
*pay_errcode = PAY_TRY_OTHER_ROUTE;
erring_node = &route_nodes[origin_index];
} else {
*pay_errcode = PAY_TRY_OTHER_ROUTE;
/* Report the *next* channel as failing. */
erring_channel = &route_channels[origin_index + 1];
dir = node_id_idx(&route_nodes[origin_index],
&route_nodes[origin_index+1]);
/* If the error is a BADONION, then it's on behalf of the
* following node. */
if (failcode & BADONION) {
log_debug(log, "failcode %u from onionreply %s",
failcode, tal_hex(tmpctx, failuremsg));
erring_node = &route_nodes[origin_index + 1];
} else
erring_node = &route_nodes[origin_index];
}
routing_failure->erring_index = (unsigned int) (origin_index + 1);
routing_failure->failcode = failcode;
routing_failure->msg = tal_dup_talarr(routing_failure, u8, failuremsg);
routing_failure->erring_node =
tal_dup_or_null(routing_failure, struct node_id, erring_node);
if (erring_channel != NULL) {
routing_failure->erring_channel = tal_dup(
routing_failure, struct short_channel_id, erring_channel);
routing_failure->channel_dir = dir;
} else {
routing_failure->erring_channel = NULL;
routing_failure->channel_dir = 0;
}
return routing_failure;
}
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 *failstr;
enum jsonrpc_errcode pay_errcode;
const u8 *failmsg;
int origin_index;
payment = wallet_payment_by_hash(tmpctx, ld->wallet,
&hout->payment_hash,
hout->partid, hout->groupid);
#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?",
fmt_sha256(tmpctx, &hout->payment_hash));
return;
}
#else
assert(payment);
#endif
assert((payment->route_channels == NULL) == (payment->route_nodes == NULL));
/* This gives more details than a generic failure message */
if (localfail) {
/* Use temporary_channel_failure if failmsg has it */
enum onion_wire failcode;
failcode = fromwire_peektype(hout->failmsg);
fail = local_routing_failure(tmpctx, ld, hout, failcode,
payment);
failstr = localfail;
pay_errcode = PAY_TRY_OTHER_ROUTE;
} else if (payment->path_secrets == NULL) {
/* This was a payment initiated with `sendonion`, we therefore
* don't have the path secrets and cannot decode the error
* onion. Let's store it and hope whatever called `sendonion`
* knows how to deal with these. */
pay_errcode = PAY_UNPARSEABLE_ONION;
fail = NULL;
failstr = NULL;
} else if (hout->failmsg) {
/* This can happen when a direct peer told channeld it's a
* malformed onion using update_fail_malformed_htlc. */
failstr = "local failure";
failmsg = hout->failmsg;
origin_index = 0;
pay_errcode = PAY_TRY_OTHER_ROUTE;
goto use_failmsg;
} else {
/* Must be normal remote fail with an onion-wrapped error. */
failstr = "reply from remote";
/* Try to parse reply. */
struct secret *path_secrets = payment->path_secrets;
failmsg = unwrap_onionreply(tmpctx, path_secrets,
tal_count(path_secrets),
hout->failonion, &origin_index);
if (!failmsg) {
log_info(hout->key.channel->log,
"htlc %"PRIu64" failed with bad reply (%s)",
hout->key.id,
tal_hex(tmpctx, hout->failonion->contents));
/* Cannot record failure. */
fail = NULL;
pay_errcode = PAY_UNPARSEABLE_ONION;
} else {
enum onion_wire failcode;
use_failmsg:
failcode = fromwire_peektype(failmsg);
log_info(hout->key.channel->log,
"htlc %"PRIu64" "
"failed from %ith node "
"with code 0x%04x (%s)",
hout->key.id,
origin_index,
failcode, onion_wire_name(failcode));
fail = remote_routing_failure(tmpctx, ld,
payment, failmsg,
origin_index,
hout->key.channel->log,
&pay_errcode);
}
}
wallet_payment_set_status(ld->wallet, &hout->payment_hash,
hout->partid, hout->groupid,
PAYMENT_FAILED, NULL);
wallet_payment_set_failinfo(ld->wallet,
&hout->payment_hash,
hout->partid,
fail ? NULL : hout->failonion,
pay_errcode == PAY_DESTINATION_PERM_FAIL,
fail ? fail->erring_index : -1,
fail ? fail->failcode : 0,
fail ? fail->erring_node : NULL,
fail ? fail->erring_channel : NULL,
NULL,
failstr,
fail ? fail->channel_dir : 0);
tell_waiters_failed(ld, &hout->payment_hash, payment, pay_errcode,
hout->failonion, fail, failstr);
}
/* Wait for a payment. If cmd is deleted, then wait_payment()
* no longer be called.
* Return callback if we called already, otherwise NULL. */
static struct command_result *wait_payment(struct lightningd *ld,
struct command *cmd,
const struct sha256 *payment_hash,
u64 partid, u64 groupid)
{
struct wallet_payment *payment;
struct onionreply *failonionreply;
bool faildestperm;
int failindex;
enum onion_wire failcode;
struct node_id *failnode;
struct short_channel_id *failchannel;
u8 *failupdate;
char *faildetail;
struct routing_failure *fail;
int faildirection;
enum jsonrpc_errcode rpcerrorcode;
payment = wallet_payment_by_hash(tmpctx, ld->wallet,
payment_hash, partid, groupid);
if (!payment) {
return command_fail(cmd, PAY_NO_SUCH_PAYMENT,
"Never attempted payment part %"PRIu64
" for '%s'",
partid,
fmt_sha256(tmpctx, payment_hash));
}
log_debug(cmd->ld->log, "Payment part %"PRIu64"/%"PRIu64"/%"PRIu64" status %u",
partid, payment->partid, payment->groupid, payment->status);
switch (payment->status) {
case PAYMENT_PENDING:
add_waitsendpay_waiter(ld, cmd, payment_hash, partid, groupid);
return NULL;
case PAYMENT_COMPLETE:
return sendpay_success(cmd, payment);
case PAYMENT_FAILED:
/* Get error from DB */
wallet_payment_get_failinfo(tmpctx, ld->wallet,
payment_hash,
partid,
groupid,
&failonionreply,
&faildestperm,
&failindex,
&failcode,
&failnode,
&failchannel,
&failupdate,
&faildetail,
&faildirection);
/* Old DB might not save failure information */
if (!failonionreply && !failnode) {
return command_fail(cmd, PAY_UNSPECIFIED_ERROR,
"Payment failure reason unknown");
} else if (failonionreply) {
/* failed to parse returned onion error */
return sendpay_fail(
cmd, payment, PAY_UNPARSEABLE_ONION, failonionreply,
NULL,
sendpay_errmsg_fmt(tmpctx, PAY_UNPARSEABLE_ONION,
NULL, faildetail));
} else {
/* Parsed onion error, get its details */
assert(failnode);
fail = tal(tmpctx, struct routing_failure);
fail->erring_index = failindex;
fail->failcode = failcode;
fail->erring_node =
tal_dup(fail, struct node_id, failnode);
if (failchannel) {
fail->erring_channel = tal_dup(
fail, struct short_channel_id, failchannel);
fail->channel_dir = faildirection;
} else {
fail->erring_channel = NULL;
}
/* FIXME: We don't store this! */
fail->msg = NULL;
rpcerrorcode = faildestperm ? PAY_DESTINATION_PERM_FAIL
: PAY_TRY_OTHER_ROUTE;
return sendpay_fail(
cmd, payment, rpcerrorcode, NULL, fail,
sendpay_errmsg_fmt(tmpctx, rpcerrorcode, fail,
faildetail));
}
}
/* Impossible. */
abort();
}
/* Returns failmsg on failure, tallocated off ctx */
static const u8 *send_onion(const tal_t *ctx, struct lightningd *ld,
const struct onionpacket *packet,
const struct route_hop *first_hop,
const struct amount_msat final_amount,
const struct sha256 *payment_hash,
const struct pubkey *blinding,
u64 partid,
u64 groupid,
struct channel *channel,
struct htlc_out **hout)
{
const u8 *onion;
unsigned int base_expiry;
/* Use bitcoind's block height, even if we're behind in processing */
base_expiry = get_network_blockheight(ld->topology) + 1;
onion = serialize_onionpacket(tmpctx, packet);
return send_htlc_out(ctx, channel, first_hop->amount,
base_expiry + first_hop->delay,
final_amount, payment_hash,
blinding, partid, groupid, onion, NULL, hout);
}
static struct command_result *check_invoice_request_usage(struct command *cmd,
const struct sha256 *local_invreq_id)
{
enum offer_status status;
struct db_stmt *stmt;
if (!local_invreq_id)
return NULL;
if (!wallet_invoice_request_find(tmpctx, cmd->ld->wallet,
local_invreq_id,
NULL, &status))
return command_fail(cmd, PAY_INVOICE_REQUEST_INVALID,
"Unknown invoice_request %s",
fmt_sha256(tmpctx, local_invreq_id));
if (!offer_status_active(status))
return command_fail(cmd, PAY_INVOICE_REQUEST_INVALID,
"Inactive invoice_request %s",
fmt_sha256(tmpctx, local_invreq_id));
if (!offer_status_single(status))
return NULL;
/* OK, we must not attempt more than one payment at once for
* single_use invoice_request we publish! */
stmt = payments_by_invoice_request(cmd->ld->wallet, local_invreq_id);
if (stmt) {
const struct wallet_payment *payment;
payment = payment_get_details(tmpctx, stmt);
tal_free(stmt);
switch (payment->status) {
case PAYMENT_COMPLETE:
return command_fail(cmd, PAY_INVOICE_REQUEST_INVALID,
"Single-use invoice_request already paid"
" with %s",
fmt_sha256(tmpctx,
&payment->payment_hash));
case PAYMENT_PENDING:
return command_fail(cmd, PAY_INVOICE_REQUEST_INVALID,
"Single-use invoice_request already"
" in progress with %s",
fmt_sha256(tmpctx,
&payment->payment_hash));
case PAYMENT_FAILED:
break;
}
}
return NULL;
}
static struct channel *
find_channel_for_htlc_add(struct lightningd *ld,
struct command *cmd,
const struct node_id *node,
struct short_channel_id scid_or_alias,
const struct amount_msat *amount)
{
struct channel *channel;
struct short_channel_id scid;
struct peer *peer = peer_by_id(ld, node);
if (!peer)
return NULL;
channel = find_channel_by_scid(peer, scid_or_alias);
if (channel && channel_state_can_add_htlc(channel->state)) {
goto found;
}
channel = find_channel_by_alias(peer, scid_or_alias, LOCAL);
if (channel && channel_state_can_add_htlc(channel->state)) {
goto found;
}
/* All-zero means "any" */
if (!channel && memeqzero(&scid_or_alias, sizeof(scid_or_alias))) {
list_for_each(&peer->channels, channel, list) {
if (channel_state_can_add_htlc(channel->state) &&
amount_msat_greater(channel->our_msat, *amount)) {
goto found;
}
}
}
log_debug(ld->log, "No channel found for selector %s (%s)",
fmt_short_channel_id(tmpctx, scid_or_alias),
fmt_amount_msat(tmpctx, *amount));
return NULL;
found:
scid = channel_scid_or_local_alias(channel);
log_debug(
ld->log, "Selected channel %s (%s) for selector %s (%s)",
fmt_short_channel_id(tmpctx, scid),
fmt_amount_msat(tmpctx, channel->our_msat),
fmt_short_channel_id(tmpctx, scid_or_alias),
fmt_amount_msat(tmpctx, *amount));
return channel;
}
/* Check if payment already in progress. Returns NULL if all good;
* sets old_payment to a previous attempt if there is one (otherwise
* NULL). */
static struct command_result *check_progress(struct lightningd *ld,
struct command *cmd,
const struct sha256 *rhash,
struct amount_msat msat,
struct amount_msat total_msat,
u64 partid,
u64 group,
const struct node_id *destination,
const struct wallet_payment **old_payment)
{
bool have_complete = false;
struct amount_msat msat_already_pending = AMOUNT_MSAT(0);
*old_payment = NULL;
/* Now, do we already have one or more payments? */
for (struct db_stmt *stmt = payments_by_hash(cmd->ld->wallet, rhash);
stmt;
stmt = payments_next(cmd->ld->wallet, stmt)) {
const struct wallet_payment *payment;
payment = payment_get_details(tmpctx, stmt);
log_debug(ld->log, "Payment: %s %s",
fmt_amount_msat(tmpctx, payment->msatoshi),
payment->status == PAYMENT_COMPLETE ? "COMPLETE"
: payment->status == PAYMENT_PENDING ? "PENDING"
: "FAILED");
switch (payment->status) {
case PAYMENT_COMPLETE:
have_complete = true;
if (payment->partid != partid)
continue;
tal_free(stmt);
/* Must match successful payment parameters. */
if (!amount_msat_eq(payment->msatoshi, msat)) {
return command_fail(cmd, PAY_RHASH_ALREADY_USED,
"Already succeeded "
"with amount %s (not %s)",
fmt_amount_msat(tmpctx,
payment->msatoshi),
fmt_amount_msat(tmpctx,
msat));
}
if (payment->destination && destination
&& !node_id_eq(payment->destination,
destination)) {
return command_fail(cmd, PAY_RHASH_ALREADY_USED,
"Already succeeded to %s",
fmt_node_id(tmpctx,
payment->destination));
}
return sendpay_success(cmd, payment);
case PAYMENT_PENDING:
/* At most one payment group can be in-flight at any
* time. */
if (payment->groupid != group) {
tal_free(stmt);
return command_fail(
cmd, PAY_IN_PROGRESS,
"Payment with groupid=%" PRIu64
" still in progress, cannot retry before "
"that completes.",
payment->groupid);
}
/* Can't mix non-parallel and parallel payments! */
if (!payment->partid != !partid) {
tal_free(stmt);
return command_fail(cmd, PAY_IN_PROGRESS,
"Already have %s payment in progress",
payment->partid ? "parallel" : "non-parallel");
}
if (payment->partid == partid) {
tal_free(stmt);
/* You can't change details while it's pending */
if (!amount_msat_eq(payment->msatoshi, msat)) {
return command_fail(cmd, PAY_RHASH_ALREADY_USED,
"Already pending "
"with amount %s (not %s)",
fmt_amount_msat(tmpctx,
payment->msatoshi),
fmt_amount_msat(tmpctx,
msat));
}
if (payment->destination && destination
&& !node_id_eq(payment->destination,
destination)) {
return command_fail(cmd, PAY_RHASH_ALREADY_USED,
"Already pending to %s",
fmt_node_id(tmpctx,
payment->destination));
}
return json_sendpay_in_progress(cmd, payment);
}
/* You shouldn't change your mind about amount being
* sent, since we'll use it in onion! */
else if (!amount_msat_eq(payment->total_msat,
total_msat)) {
tal_free(stmt);
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"msatoshi was previously %s, now %s",
fmt_amount_msat(tmpctx,
payment->total_msat),
fmt_amount_msat(tmpctx,
total_msat));
}
if (!amount_msat_add(&msat_already_pending,
msat_already_pending,
payment->msatoshi)) {
tal_free(stmt);
return command_fail(cmd, LIGHTNINGD,
"Internal amount overflow!"
" %s + %s",
fmt_amount_msat(tmpctx,
msat_already_pending),
fmt_amount_msat(tmpctx,
payment->msatoshi));
}
break;
case PAYMENT_FAILED:
if (payment->partid == partid)
*old_payment = payment;
}
/* There is no way for us to add a payment with the
* same (payment_hash, partid, groupid) tuple since
* it'd collide with the database primary key. So
* report this as soon as possible. */
if (payment->partid == partid && payment->groupid == group) {
tal_free(stmt);
return command_fail(
cmd, PAY_RHASH_ALREADY_USED,
"There already is a payment with payment_hash=%s, "
"groupid=%" PRIu64 ", partid=%" PRIu64
". Either change the partid, or wait for the "
"payment to complete and start a new group.",
fmt_sha256(tmpctx, rhash), group,
partid);
}
}
/* If any part has succeeded, you can't start a new one! */
if (have_complete) {
return command_fail(cmd, PAY_RHASH_ALREADY_USED,