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add operation to count number of known coins per denomination to exchangedb

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This commit is contained in:
Christian Grothoff 2018-10-28 11:38:45 +01:00
parent bd40aad7dc
commit be9ff317dd
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GPG Key ID: 939E6BE1E29FC3CC
2 changed files with 59 additions and 0 deletions
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45
src/exchangedb/plugin_exchangedb_postgres.c
View File

@ -289,6 +289,8 @@ postgres_create_tables (void *cls)
",denom_pub_hash BYTEA NOT NULL REFERENCES denominations (denom_pub_hash) ON DELETE CASCADE"
",denom_sig BYTEA NOT NULL"
");"),
GNUNET_PQ_make_try_execute ("CREATE INDEX known_coins_by_denomination ON "
"known_coins (denom_pub_hash)"),
/* Table with the commitments made when melting a coin. */
GNUNET_PQ_make_execute("CREATE TABLE IF NOT EXISTS refresh_commitments "
@ -797,6 +799,13 @@ postgres_prepare (PGconn *db_conn)
" ORDER BY reserve_out_serial_id ASC;",
1),
/* Used in #postgres_count_known_coins() */
GNUNET_PQ_make_prepare ("count_known_coins",
"SELECT"
" COUNT(*) AS count"
" FROM known_coins"
" WHERE denom_pub_hash=$1;",
1),
/* Used in #postgres_get_known_coin() to fetch
the denomination public key and signature for
a coin known to the exchange. */
@ -3196,6 +3205,41 @@ insert_known_coin (void *cls,
}
/**
* Count the number of known coins by denomination.
*
* @param cls database connection plugin state
* @param session database session
* @param denom_pub_hash denomination to count by
* @return number of coins if non-negative, otherwise an `enum GNUNET_DB_QueryStatus`
*/
static long long
postgres_count_known_coins (void *cls,
struct TALER_EXCHANGEDB_Session *session,
const struct GNUNET_HashCode *denom_pub_hash)
{
uint64_t count;
struct GNUNET_PQ_QueryParam params[] = {
GNUNET_PQ_query_param_auto_from_type (denom_pub_hash),
GNUNET_PQ_query_param_end
};
struct GNUNET_PQ_ResultSpec rs[] = {
GNUNET_PQ_result_spec_uint64 ("count",
&count),
GNUNET_PQ_result_spec_end
};
enum GNUNET_DB_QueryStatus qs;
qs = GNUNET_PQ_eval_prepared_singleton_select (session->conn,
"count_known_coins",
params,
rs);
if (0 > qs)
return (long long) qs;
return (long long) count;
}
/**
* Make sure the given @a coin is known to the database.
*
@ -7064,6 +7108,7 @@ libtaler_plugin_exchangedb_postgres_init (void *cls)
plugin->insert_withdraw_info = &postgres_insert_withdraw_info;
plugin->get_reserve_history = &postgres_get_reserve_history;
plugin->free_reserve_history = &common_free_reserve_history;
plugin->count_known_coins = &postgres_count_known_coins;
plugin->ensure_coin_known = &postgres_ensure_coin_known;
plugin->have_deposit = &postgres_have_deposit;
plugin->mark_deposit_tiny = &postgres_mark_deposit_tiny;

14
src/include/taler_exchangedb_plugin.h
View File

@ -1397,6 +1397,20 @@ struct TALER_EXCHANGEDB_Plugin
struct TALER_EXCHANGEDB_ReserveHistory *rh);
/**
* Count the number of known coins by denomination.
*
* @param cls database connection plugin state
* @param session database session
* @param denom_pub_hash denomination to count by
* @return number of coins if non-negative, otherwise an `enum GNUNET_DB_QueryStatus`
*/
long long
(*count_known_coins) (void *cls,
struct TALER_EXCHANGEDB_Session *session,
const struct GNUNET_HashCode *denom_pub_hash);
/**
* Make sure the given @a coin is known to the database.
*