pay: Add timestamp of first part to listpays

Changelog-Added: JSON-RPC: The result returned by `listpays` now includes the timestamp of the first part of the payment

plugins/pay.c

@@ -1666,6 +1666,9 @@ struct pay_mpp {
  * only). Null if we have any part for which we didn't know the
  * amount. */
  struct amount_msat *amount;
+
+ /* Timestamp of the first part */
+ u32 timestamp;
 };
 
 static const struct sha256 *pay_mpp_key(const struct pay_mpp *pm)
@@ -1735,6 +1738,8 @@ static void add_new_entry(struct json_stream *ret,
  json_object_start(ret, NULL);
  json_add_string(ret, "bolt11", pm->b11);
  json_add_string(ret, "status", pm->status);
+ json_add_u32(ret, "created_at", pm->timestamp);
+
  if (pm->label)
  json_add_tok(ret, "label", pm->label, buf);
  if (pm->preimage)
@@ -1777,15 +1782,21 @@ static struct command_result *listsendpays_done(struct command *cmd,
  ret = jsonrpc_stream_success(cmd);
  json_array_start(ret, "pays");
  json_for_each_arr(i, t, arr) {
- const jsmntok_t *status, *b11tok, *hashtok;
+ const jsmntok_t *status, *b11tok, *hashtok, *createdtok;
  const char *b11 = b11str;
  struct sha256 payment_hash;
+ u32 created_at;
+
+ fprintf(stderr, "XXX payment %.*s\n", json_tok_full_len(t), json_tok_full(buf, t));
 
  b11tok = json_get_member(buf, t, "bolt11");
  hashtok = json_get_member(buf, t, "payment_hash");
+ createdtok = json_get_member(buf, t, "created_at");
  assert(hashtok != NULL);
+ assert(createdtok != NULL);
 
  json_to_sha256(buf, hashtok, &payment_hash);
+ json_to_u32(buf, createdtok, &created_at);
  if (b11tok)
  b11 = json_strdup(cmd, buf, b11tok);
 
@@ -1800,6 +1811,7 @@ static struct command_result *listsendpays_done(struct command *cmd,
  pm->amount = talz(pm, struct amount_msat);
  pm->num_nonfailed_parts = 0;
  pm->status = NULL;
+ pm->timestamp = created_at;
  pay_map_add(&pay_map, pm);
  }
 

tests/test_pay.py

@@ -3221,3 +3221,4 @@ def test_bolt11_null_after_pay(node_factory, bitcoind):
  pays = l2.rpc.listpays()["pays"]
  assert(pays[0]["bolt11"] == invl1)
  assert('amount_msat' in pays[0] and pays[0]['amount_msat'] == amt)
+ assert('created_at' in pays[0])