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Retry SQLITE_BUSY when stepping in TurfWar

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Justine Tunney 2023-01-03 05:15:04 -08:00
parent e496ee7a80
commit a6586cafb2
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GPG key ID: BE714B4575D6E328
2 changed files with 29 additions and 17 deletions
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20
net/turfwar/turfwar.c
View file

@ -423,6 +423,18 @@ int DbOpen(const char *path, sqlite3 **db) {
return sqlite3_exec(*db, "PRAGMA synchronous=NORMAL", 0, 0, 0);
}
int DbStep(sqlite3_stmt *stmt) {
int i, rc;
for (i = 0; i < 12; ++i) {
rc = sqlite3_step(stmt);
if (rc == SQLITE_ROW) break;
if (rc == SQLITE_DONE) break;
if (rc != SQLITE_BUSY) return rc;
usleep(1000L << i);
}
return rc;
}
// why not make the statement prepare api a little less hairy too
int DbPrepare(sqlite3 *db, sqlite3_stmt **stmt, const char *sql) {
return sqlite3_prepare_v2(db, sql, -1, stmt, 0);
@ -1435,7 +1447,7 @@ bool GenerateScore(struct Asset *out, long secs, long cash) {
// be sure to always use transactions with sqlite as in always
// otherwise.. you can use --strace to see the fcntl bloodbath
CHECK_SQL(sqlite3_exec(db, "BEGIN TRANSACTION", 0, 0, 0));
while ((rc = sqlite3_step(stmt)) != SQLITE_DONE) {
while ((rc = DbStep(stmt)) != SQLITE_DONE) {
if (rc != SQLITE_ROW) CHECK_DB(rc);
strlcpy(name2, (void *)sqlite3_column_text(stmt, 0), sizeof(name2));
if (!IsValidNick(name2, -1)) continue;
@ -1584,7 +1596,7 @@ StartOver:
t.mtim.tv_nsec));
CHECK_SYS(appends(&t.data.p, "\"recent\":[\n"));
CHECK_SQL(sqlite3_exec(db, "BEGIN TRANSACTION", 0, 0, 0));
for (once = false; (rc = sqlite3_step(stmt)) != SQLITE_DONE; once = true) {
for (once = false; (rc = DbStep(stmt)) != SQLITE_DONE; once = true) {
if (rc != SQLITE_ROW) CHECK_SQL(rc);
if (once) CHECK_SYS(appends(&t.data.p, ",\n"));
CHECK_SYS(
@ -1675,7 +1687,7 @@ StartOver:
CHECK_DB(sqlite3_bind_text(stmt, 2, v[i].name, -1, SQLITE_TRANSIENT));
CHECK_DB(sqlite3_bind_int64(stmt, 3, v[i].created));
CHECK_DB(sqlite3_bind_int64(stmt, 3, v[i].created));
CHECK_DB((rc = sqlite3_step(stmt)) == SQLITE_DONE ? SQLITE_OK : rc);
CHECK_DB((rc = DbStep(stmt)) == SQLITE_DONE ? SQLITE_OK : rc);
CHECK_DB(sqlite3_reset(stmt));
++processed;
}
@ -1819,7 +1831,7 @@ int main(int argc, char *argv[]) {
_Exit(3);
}
if (!Blackhole(0)) {
kprintf("redbean isn't able to protect your kernel from level 4 ddos\n");
kprintf("turfwar isn't able to protect your kernel from level 4 ddos\n");
kprintf("please run the blackholed program, see https://justine.lol/\n");
}

26
tool/net/redbean.c
View file

@ -4877,19 +4877,19 @@ static int LuaProgramTokenBucket(lua_State *L) {
luaL_argerror(L, 5, "require ban <= ignore");
unreachable;
}
INFOF("(token) deploying %,ld buckets "
"(one for every %ld ips) "
"each holding 127 tokens which "
"replenish %g times per second, "
"reject at %d tokens, "
"ignore at %d tokens, and "
"ban at %d tokens",
1L << cidr, //
4294967296 / (1L << cidr), //
replenish, //
reject, //
ignore, //
ban);
VERBOSEF("(token) deploying %,ld buckets "
"(one for every %ld ips) "
"each holding 127 tokens which "
"replenish %g times per second, "
"reject at %d tokens, "
"ignore at %d tokens, and "
"ban at %d tokens",
1L << cidr, //
4294967296 / (1L << cidr), //
replenish, //
reject, //
ignore, //
ban);
if (ignore == -1) ignore = -128;
if (ban == -1) ban = -128;
if (ban >= 0 && (IsLinux() || IsBsd())) {