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bandb: Group writes in transactions to reduce load on heavy kline activity.

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When a ban is added or removed, open a transaction and
close it after 3 seconds; any bans in the 3 seconds
will not trigger another transaction (= 4 fsyncs with
sqlite).

The transaction is also committed if ircd closes the
connection, but not if bandb itself is terminated with
a signal.
This commit is contained in:
Jilles Tjoelker 2010-03-03 22:58:16 +01:00
parent c52fe5f5f2
commit 9fca38c815
1 changed files with 28 additions and 0 deletions
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28
bandb/bandb.c
View file

@ -38,6 +38,8 @@
#define MAXPARA 10
#define COMMIT_INTERVAL 3 /* seconds */
typedef enum
{
BANDB_KLINE,
@ -57,9 +59,17 @@ static const char *bandb_table[LAST_BANDB_TYPE] = {
static rb_helper *bandb_helper;
static int in_transaction;
static void check_schema(void);
static void
bandb_commit(void *unused)
{
rsdb_transaction(RSDB_TRANS_END);
in_transaction = 0;
}
static void
parse_ban(bandb_type type, char *parv[], int parc)
{
@ -89,6 +99,14 @@ parse_ban(bandb_type type, char *parv[], int parc)
perm = parv[para++];
reason = parv[para++];
if(!in_transaction)
{
rsdb_transaction(RSDB_TRANS_START);
in_transaction = 1;
rb_event_addonce("bandb_commit", bandb_commit, NULL,
COMMIT_INTERVAL);
}
rsdb_exec(NULL,
"INSERT INTO %s (mask1, mask2, oper, time, perm, reason) VALUES('%Q', '%Q', '%Q', %s, %s, '%Q')",
bandb_table[type], mask1, mask2 ? mask2 : "", oper, curtime, perm, reason);
@ -113,6 +131,14 @@ parse_unban(bandb_type type, char *parv[], int parc)
if(type == BANDB_KLINE)
mask2 = parv[2];
if(!in_transaction)
{
rsdb_transaction(RSDB_TRANS_START);
in_transaction = 1;
rb_event_addonce("bandb_commit", bandb_commit, NULL,
COMMIT_INTERVAL);
}
rsdb_exec(NULL, "DELETE FROM %s WHERE mask1='%Q' AND mask2='%Q'",
bandb_table[type], mask1, mask2 ? mask2 : "");
}
@ -215,6 +241,8 @@ parse_request(rb_helper *helper)
static void
error_cb(rb_helper *helper)
{
if(in_transaction)
rsdb_transaction(RSDB_TRANS_END);
exit(1);
}