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locking for known_coins

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This commit is contained in:
Florian Dold 2019-08-26 03:09:38 +02:00
parent 58b5700c87
commit 613217be03
No known key found for this signature in database
GPG Key ID: D2E4F00F29D02A4B
1 changed files with 14 additions and 0 deletions
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14
src/exchangedb/plugin_exchangedb_postgres.c
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@ -849,6 +849,12 @@ postgres_prepare (PGconn *db_conn)
" WHERE coin_pub=$1"
" FOR UPDATE;",
1),
/* Lock deposit table; NOTE: we may want to eventually shard the
deposit table to avoid this lock being the main point of
contention limiting transaction performance. */
GNUNET_PQ_make_prepare ("lock_known_coins",
"LOCK TABLE known_coins;",
0),
/* Used in #postgres_insert_known_coin() to store
the denomination public key and signature for
a coin known to the exchange. */
@ -3462,6 +3468,14 @@ postgres_ensure_coin_known (void *cls,
struct PostgresClosure *pc = cls;
enum GNUNET_DB_QueryStatus qs;
struct TALER_CoinPublicInfo known_coin;
struct GNUNET_PQ_QueryParam no_params[] = {
GNUNET_PQ_query_param_end
};
if (0 > (qs = GNUNET_PQ_eval_prepared_non_select (session->conn,
"lock_known_coins",
no_params)))
return qs;
/* check if the coin is already known */
qs = postgres_get_known_coin (pc,