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pay: Call listsendpays to find prior attempts and abort if needed

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So far we've always been deferring the deletion, retry and early abort
logic to `sendonion` and `sendpay` which do not have the context to
decide if a call is legitimate or not (they were mostly based on
heuristics). By calling `listsendpays` for the invoice's
`payment_hash` we can identify what our `groupid` should be, but more
importantly we can also abort if another payment is pending or a prior
attempt has already succeeded.
This commit is contained in:
Christian Decker 2021-09-29 17:56:54 +02:00 • committed by Rusty Russell
parent a9eb7b427f
commit f384385f8e
1 changed files with 77 additions and 2 deletions
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79
plugins/pay.c
View file

@ -1936,6 +1936,76 @@ static const char *init(struct plugin *p,
return NULL;
}
/* We are interested in any prior attempts to pay this payment_hash /
* invoice so we can set the `groupid` correctly and ensure we don't
* already have a pending payment running. */
static struct command_result *
payment_listsendpays_previous(struct command *cmd, const char *buf,
const jsmntok_t *result, struct payment *p)
{
size_t i;
const jsmntok_t *t, *arr, *err;
/* What was the groupid of an eventual previous attempt? */
u64 last_group = 0;
/* Do we have pending sendpays for the previous attempt? */
bool pending = false;
/* Did a prior attempt succeed? */
bool completed = false;
err = json_get_member(buf, result, "error");
if (err)
return command_fail(
cmd, LIGHTNINGD,
"Error retrieving previous pay attempts: %s",
json_strdup(tmpctx, buf, err));
arr = json_get_member(buf, result, "payments");
if (!arr || arr->type != JSMN_ARRAY)
return command_fail(
cmd, LIGHTNINGD,
"Unexpected non-array result from listsendpays");
/* We iterate through all prior sendpays, looking for the
* latest group and remembering what its state is. */
json_for_each_arr(i, t, arr)
{
u64 groupid;
const jsmntok_t *status, *grouptok;
grouptok = json_get_member(buf, t, "groupid");
json_to_u64(buf, grouptok, &groupid);
/* New group, reset what we collected. */
if (last_group != groupid) {
completed = false;
pending = false;
last_group = groupid;
}
status = json_get_member(buf, t, "status");
completed |= json_tok_streq(buf, status, "complete");
pending |= json_tok_streq(buf, status, "pending");
}
if (completed) {
return command_fail(
cmd, PAY_RHASH_ALREADY_USED,
"The payment with payment_hash=%s was successful "
"(groupid=%" PRIu64 ")",
type_to_string(tmpctx, struct sha256, p->payment_hash),
last_group);
} else if (pending) {
return command_fail(
cmd, PAY_IN_PROGRESS,
"Already have payment with payment_hash=%s in progress "
"(groupid=%" PRIu64 ")",
type_to_string(tmpctx, struct sha256, p->payment_hash),
last_group);
}
p->groupid = last_group + 1;
payment_start(p);
return command_still_pending(cmd);
}
struct payment_modifier *paymod_mods[] = {
&local_channel_hints_pay_mod,
&exemptfee_pay_mod,
@ -1986,6 +2056,7 @@ static struct command_result *json_paymod(struct command *cmd,
u64 invexpiry;
struct sha256 *local_offer_id;
const struct tlv_invoice *b12;
struct out_req *req;
#if DEVELOPER
bool *use_shadow;
#endif
@ -2167,12 +2238,16 @@ static struct command_result *json_paymod(struct command *cmd,
shadow_route->use_shadow = *use_shadow;
#endif
p->label = tal_steal(p, label);
payment_start(p);
list_add_tail(&payments, &p->list);
/* We're keeping this around now */
tal_steal(cmd->plugin, p);
return command_still_pending(cmd);
req = jsonrpc_request_start(cmd->plugin, cmd, "listsendpays",
payment_listsendpays_previous,
payment_listsendpays_previous, p);
json_add_sha256(req->js, "payment_hash", p->payment_hash);
return send_outreq(cmd->plugin, req);
}
static const struct plugin_command commands[] = {