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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/platform/basic.h"
#include "mongo/base/data_builder.h"
#include "mongo/base/data_type_validated.h"
#include "mongo/base/init.h"
#include "mongo/db/client.h"
#include "mongo/db/ftdc/collector.h"
#include "mongo/db/ftdc/config.h"
#include "mongo/db/ftdc/controller.h"
#include "mongo/db/ftdc/varint.h"
#include "mongo/unittest/unittest.h"
namespace mongo {
// Test integer packing and unpacking
void TestInt(std::uint64_t i) {
char buf[11];
DataView dvWrite(&buf[0]);
dvWrite.write(i);
ConstDataView cdvRead(&buf[0]);
std::uint64_t d = cdvRead.read<std::uint64_t>();
ASSERT_EQUALS(i, d);
}
// Test various integer combinations compress and uncompress correctly
TEST(FTDCVarIntTest, TestIntCompression) {
// Check numbers with leading 1
for (int i = 0; i < 63; i++) {
TestInt(i);
TestInt(i - 1);
}
// Check numbers composed of repeating hex numbers
for (int i = 0; i < 15; i++) {
std::uint64_t v = 0;
for (int j = 0; j < 15; j++) {
v = v << 4 | i;
TestInt(v);
}
}
}
// Test data builder can write a lot of zeros
TEST(FTDCVarIntTest, TestDataBuilder) {
DataBuilder db(1);
// DataBuilder grows by 2x, and we reserve 10 bytes
// lcm(2**x, 10) == 16
for (int i = 0; i < 16; i++) {
auto s1 = db.writeAndAdvance(FTDCVarInt(0));
ASSERT_OK(s1);
};
}
} // namespace mongo
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