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-rw-r--r--src/mongo/dbtests/shared_buffer_test.cpp191
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diff --git a/src/mongo/dbtests/shared_buffer_test.cpp b/src/mongo/dbtests/shared_buffer_test.cpp
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-/**
- * Copyright (C) 2019-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/string_data.h"
-#include "mongo/util/shared_buffer.h"
-#include "mongo/util/shared_buffer_fragment.h"
-
-#include "mongo/unittest/unittest.h"
-
-namespace mongo {
-namespace {
-
-using SharedBufferTest = unittest::Test;
-
-TEST_F(SharedBufferTest, ReallocOrCopyNull) {
- SharedBuffer buf;
- ASSERT_EQ(buf.capacity(), 0u);
- ASSERT(!buf);
- ASSERT(!buf.isShared());
- buf.reallocOrCopy(10);
- ASSERT(buf);
- ASSERT(!buf.isShared());
- ASSERT_EQ(buf.capacity(), 10u);
-}
-
-TEST_F(SharedBufferTest, ReallocOrCopyNullShared) {
- // null SharedBuffers are never considered "shared", even when copied.
- SharedBuffer buf;
- const SharedBuffer sharer = buf;
- ASSERT_EQ(buf.capacity(), 0u);
- ASSERT(!buf);
- ASSERT(!buf.isShared());
- buf.reallocOrCopy(10);
- ASSERT(buf);
- ASSERT(!buf.isShared());
- ASSERT_EQ(buf.capacity(), 10u);
- ASSERT_EQ(sharer.capacity(), 0u);
-}
-
-SharedBuffer makeBuffer() {
- SharedBuffer buf = SharedBuffer::allocate(4);
- memcpy(buf.get(), "foo", 4);
- return buf;
-}
-
-TEST_F(SharedBufferTest, ReallocOrCopyGrow) {
- SharedBuffer buf = makeBuffer();
- ASSERT_EQ(buf.capacity(), 4u);
- ASSERT(buf);
- ASSERT(!buf.isShared());
- buf.reallocOrCopy(10);
- ASSERT(buf);
- ASSERT(!buf.isShared());
- ASSERT_EQ(buf.capacity(), 10u);
- ASSERT_EQ("foo"_sd, buf.get());
-}
-
-TEST_F(SharedBufferTest, ReallocOrCopyGrowShared) {
- SharedBuffer buf = makeBuffer();
- const SharedBuffer sharer = buf;
- ASSERT_EQ(buf.capacity(), 4u);
- ASSERT(buf);
- ASSERT(buf.isShared());
- buf.reallocOrCopy(10);
- ASSERT(buf);
- ASSERT(!buf.isShared());
- ASSERT_EQ(buf.capacity(), 10u);
- ASSERT_EQ(sharer.capacity(), 4u);
- ASSERT_EQ("foo"_sd, buf.get());
- ASSERT_EQ("foo"_sd, sharer.get());
- ASSERT_NE(buf.get(), sharer.get());
-}
-
-TEST_F(SharedBufferTest, ReallocOrCopyShrink) {
- SharedBuffer buf = makeBuffer();
- ASSERT_EQ(buf.capacity(), 4u);
- ASSERT(buf);
- ASSERT(!buf.isShared());
- // The buffer is already at least 1 byte.
- buf.reallocOrCopy(1);
- ASSERT(buf);
- // We copy it anyway.
- ASSERT(!buf.isShared());
- ASSERT_EQ(buf.capacity(), 1u);
- ASSERT_EQ('f', buf.get()[0]);
-}
-
-TEST_F(SharedBufferTest, ReallocOrCopyShrinkShared) {
- SharedBuffer buf = makeBuffer();
- const SharedBuffer sharer = buf;
- ASSERT_EQ(buf.capacity(), 4u);
- ASSERT(buf);
- ASSERT(buf.isShared());
- // The buffer is already at least 1 byte.
- buf.reallocOrCopy(1);
- ASSERT(buf);
- // We copy it anyway.
- ASSERT(!buf.isShared());
- ASSERT_EQ(buf.capacity(), 1u);
- ASSERT_EQ(sharer.capacity(), 4u);
- ASSERT_EQ('f', buf.get()[0]);
- ASSERT_EQ("foo"_sd, sharer.get());
- ASSERT_NE(buf.get(), sharer.get());
-}
-
-TEST_F(SharedBufferTest, SharedBufferFragmentBuilder) {
- constexpr size_t kBlockSize = 16;
- SharedBufferFragmentBuilder builder(kBlockSize);
-
- auto verifyFragment = [](const SharedBufferFragment& fragment, uint8_t expected) {
- for (size_t i = 0; i < fragment.size(); ++i)
- ASSERT(memcmp(fragment.get() + i, &expected, 1) == 0);
- };
-
- builder.start(kBlockSize / 2);
- ASSERT_EQ(builder.capacity(), kBlockSize);
- uint8_t one = 1;
- memset(builder.get(), one, kBlockSize / 2);
- auto fragment1 = builder.finish(kBlockSize / 2);
- ASSERT_EQ(fragment1.size(), kBlockSize / 2);
- verifyFragment(fragment1, one);
-
- builder.start(kBlockSize / 2);
- ASSERT_EQ(builder.capacity(), kBlockSize / 2);
- // We can use less than we ask for
- uint8_t two = 2;
- memset(builder.get(), two, kBlockSize / 4);
- auto fragment2 = builder.finish(kBlockSize / 4);
- ASSERT_EQ(fragment2.size(), kBlockSize / 4);
- // Buffers should not overlap and be next to each other
- ASSERT_EQ(fragment1.get() + fragment1.size(), fragment2.get());
- verifyFragment(fragment2, two);
-
- // Verify that anything written is transfered when we grow
- builder.start(builder.capacity());
- ASSERT_EQ(builder.capacity(), kBlockSize / 4);
- uint8_t three = 3;
- size_t written = kBlockSize / 4;
- // Write current capacity
- memset(builder.get(), three, written);
- builder.grow(kBlockSize);
- // Write the rest
- memset(builder.get() + written, three, builder.capacity() - written);
- auto fragment3 = builder.finish(kBlockSize);
- for (size_t i = 0; i < (kBlockSize / 4); ++i)
- ASSERT(memcmp(fragment3.get() + i, &three, 1) == 0);
- ASSERT_GTE(builder.capacity(), kBlockSize);
- verifyFragment(fragment3, three);
-
- builder.start(builder.capacity());
- auto ptr = builder.get();
- builder.discard();
- builder.start(builder.capacity());
- ASSERT_EQ(builder.get(), ptr);
-
- // No buffers should have been overwritten by others
- verifyFragment(fragment1, one);
- verifyFragment(fragment2, two);
- verifyFragment(fragment3, three);
-}
-
-} // namespace
-} // namespace mongo
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