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/* Copyright (c) 2013, 2025, Oracle and/or its affiliates.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is designed to work with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have either included with
the program or referenced in the documentation.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License, version 2.0, for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
#include <gtest/gtest.h>
#include <sys/types.h>
#include "mysql/psi/mysql_mutex.h"
#include "sql/log.h"
#include "unittest/gunit/test_utils.h"
namespace log_throttle_unittest {
using my_testing::Server_initializer;
int summary_count = 0;
char last_query[10];
static bool slow_logger(THD *, const char *query, size_t, bool, ulonglong,
ulonglong) {
summary_count++;
strcpy(last_query, query);
return false;
}
class LogThrottleTest : public ::testing::Test {
protected:
void SetUp() override {
initializer.SetUp();
mysql_mutex_init(0, &m_mutex, MY_MUTEX_INIT_FAST);
summary_count = 0;
}
void TearDown() override {
initializer.TearDown();
mysql_mutex_destroy(&m_mutex);
}
THD *thd() { return initializer.thd(); }
Server_initializer initializer;
mysql_mutex_t m_mutex;
};
// Slow_log_throttles test cases starts from here.
/*
Test basic functionality - throttling, eligibility, printing of summary of
Slow_log_throttle.
*/
TEST_F(LogThrottleTest, SlowLogBasic) {
ulong threshold = 2;
ulong window = 1000000;
Slow_log_throttle throttle(&threshold, &m_mutex, window, slow_logger, "%lu");
// Should not be throttled
EXPECT_FALSE(throttle.log(thd(), true));
EXPECT_FALSE(throttle.log(thd(), true));
// Should not be throttled, not eligible
EXPECT_FALSE(throttle.log(thd(), false));
// Flush and check that summary was not printed
EXPECT_FALSE(throttle.flush(thd()));
EXPECT_EQ(0, summary_count);
// Should be throttled
EXPECT_TRUE(throttle.log(thd(), true));
// Flush and check that summary was printed
EXPECT_TRUE(throttle.flush(thd()));
EXPECT_EQ(1, summary_count);
// Flush and check that summary was not printed again
EXPECT_FALSE(throttle.flush(thd()));
EXPECT_EQ(1, summary_count);
// Get another summary printed
EXPECT_FALSE(throttle.log(thd(), true));
EXPECT_FALSE(throttle.log(thd(), true));
EXPECT_TRUE(throttle.log(thd(), true));
EXPECT_TRUE(throttle.flush(thd()));
EXPECT_EQ(2, summary_count);
}
// Test changes to the threshold level of slow logger
TEST_F(LogThrottleTest, SlowLogThresholdChange) {
ulong threshold = 2;
ulong window = 1000000;
Slow_log_throttle throttle(&threshold, &m_mutex, window, slow_logger, "%lu");
// Reach threshold
EXPECT_FALSE(throttle.log(thd(), true));
EXPECT_FALSE(throttle.log(thd(), true));
// Flush and check that summary was not printed
EXPECT_FALSE(throttle.flush(thd()));
EXPECT_EQ(0, summary_count);
// Reduce threshold, flush and check that summary was printed
threshold = 1;
EXPECT_TRUE(throttle.flush(thd()));
EXPECT_EQ(1, summary_count);
// Increase threshold and reach it
threshold = 3;
EXPECT_FALSE(throttle.log(thd(), true));
EXPECT_FALSE(throttle.log(thd(), true));
EXPECT_FALSE(throttle.log(thd(), true));
// Flush and check that summary was not printed
EXPECT_FALSE(throttle.flush(thd()));
EXPECT_EQ(1, summary_count);
}
// Test number of suppressed messages written by slow logger
TEST_F(LogThrottleTest, SlowLogSuppressCount) {
ulong threshold = 1;
ulong window = 1000000;
Slow_log_throttle throttle(&threshold, &m_mutex, window, slow_logger, "%lu");
// Suppress 3 events
EXPECT_FALSE(throttle.log(thd(), true));
EXPECT_TRUE(throttle.log(thd(), true));
EXPECT_TRUE(throttle.log(thd(), true));
EXPECT_TRUE(throttle.log(thd(), true));
EXPECT_TRUE(throttle.flush(thd()));
EXPECT_EQ(1, summary_count);
EXPECT_STREQ("3", last_query);
// Suppress 2 events
EXPECT_FALSE(throttle.log(thd(), true));
EXPECT_FALSE(throttle.log(thd(), false));
EXPECT_TRUE(throttle.log(thd(), true));
EXPECT_TRUE(throttle.log(thd(), true));
EXPECT_FALSE(throttle.log(thd(), false));
EXPECT_TRUE(throttle.flush(thd()));
EXPECT_EQ(2, summary_count);
EXPECT_STREQ("2", last_query);
}
// End of Slow_log_throttles test cases.
} // namespace log_throttle_unittest
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