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pay: Make pay idempotent

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Christian Decker 2021-09-30 18:38:48 +02:00 • committed by Rusty Russell
parent 5f260840ab
commit a4fb5bceb0
1 changed files with 48 additions and 7 deletions
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55
plugins/pay.c
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@ -1938,7 +1938,9 @@ static const char *init(struct plugin *p,
/* 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. */
* already have a pending payment running. We also collect the summary
* about an eventual previous complete payment so we can return that
* as a no-op. */
static struct command_result *
payment_listsendpays_previous(struct command *cmd, const char *buf,
const jsmntok_t *result, struct payment *p)
@ -1952,6 +1954,14 @@ payment_listsendpays_previous(struct command *cmd, const char *buf,
/* Did a prior attempt succeed? */
bool completed = false;
/* Metadata for a complete payment, if one exists. */
struct json_stream *ret;
u32 parts = 0;
struct preimage preimage;
struct amount_msat sent, msat;
struct node_id destination;
u32 created_at;
err = json_get_member(buf, result, "error");
if (err)
return command_fail(
@ -1971,6 +1981,7 @@ payment_listsendpays_previous(struct command *cmd, const char *buf,
{
u64 groupid;
const jsmntok_t *status, *grouptok;
struct amount_msat diff_sent, diff_msat;
grouptok = json_get_member(buf, t, "groupid");
json_to_u64(buf, grouptok, &groupid);
@ -1979,6 +1990,30 @@ payment_listsendpays_previous(struct command *cmd, const char *buf,
completed = false;
pending = false;
last_group = groupid;
parts = 1;
json_scan(tmpctx, buf, t,
"{destination:%"
",created_at:%"
",amount_msat:%"
",amount_sent_msat:%"
",payment_preimage:%}",
JSON_SCAN(json_to_node_id, &destination),
JSON_SCAN(json_to_u32, &created_at),
JSON_SCAN(json_to_msat, &msat),
JSON_SCAN(json_to_msat, &sent),
JSON_SCAN(json_to_preimage, &preimage));
} else {
json_scan(tmpctx, buf, t,
"{amount_msat:%"
",amount_sent_msat:%}",
JSON_SCAN(json_to_msat, &diff_msat),
JSON_SCAN(json_to_msat, &diff_sent));
if (!amount_msat_add(&msat, msat, diff_msat) ||
!amount_msat_add(&sent, sent, diff_sent))
plugin_err(p->plugin,
"msat overflow adding up parts");
parts++;
}
status = json_get_member(buf, t, "status");
@ -1987,12 +2022,18 @@ payment_listsendpays_previous(struct command *cmd, const char *buf,
}
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);
ret = jsonrpc_stream_success(cmd);
json_add_preimage(ret, "payment_preimage", &preimage);
json_add_string(ret, "status", "complete");
json_add_amount_msat_compat(ret, msat, "msatoshi",
"amount_msat");
json_add_amount_msat_compat(ret, sent, "msatoshi_sent",
"amount_sent_msat");
json_add_node_id(ret, "destination", p->destination);
json_add_sha256(ret, "payment_hash", p->payment_hash);
json_add_u32(ret, "created_at", created_at);
json_add_num(ret, "parts", parts);
return command_finished(cmd, ret);
} else if (pending) {
return command_fail(
cmd, PAY_IN_PROGRESS,