127 lines
3.2 KiB
C++
127 lines
3.2 KiB
C++
/*
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* serialize.cpp
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*
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* This source file is part of the FoundationDB open source project
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*
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* Copyright 2013-2022 Apple Inc. and the FoundationDB project authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "flow/network.h"
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#include "flow/serialize.h"
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#include "flow/UnitTest.h"
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_AssumeVersion::_AssumeVersion(ProtocolVersion version) : v(version) {
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if (!version.isValid()) {
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ASSERT(!g_network->isSimulated());
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throw serialization_failed();
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}
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}
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const void* BinaryReader::readBytes(int bytes) {
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const char* b = begin;
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const char* e = b + bytes;
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if (e > end) {
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ASSERT(!g_network->isSimulated());
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throw serialization_failed();
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}
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begin = e;
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return b;
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}
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namespace {
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struct _Struct {
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static constexpr FileIdentifier file_identifier = 2340487;
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int oldField{ 0 };
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};
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struct OldStruct : public _Struct {
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void setFields() { oldField = 1; }
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bool isSet() const { return oldField == 1; }
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template <class Archive>
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void serialize(Archive& ar) {
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serializer(ar, oldField);
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}
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};
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struct NewStruct : public _Struct {
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int newField{ 0 };
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bool isSet() const { return oldField == 1 && newField == 2; }
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void setFields() {
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oldField = 1;
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newField = 2;
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}
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template <class Archive>
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void serialize(Archive& ar) {
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serializer(ar, oldField, newField);
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}
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};
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void verifyData(StringRef value, int numObjects) {
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{
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// use BinaryReader
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BinaryReader reader(value, IncludeVersion());
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std::vector<OldStruct> data;
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reader >> data;
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ASSERT_EQ(data.size(), numObjects);
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for (const auto& object : data) {
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ASSERT(object.isSet());
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}
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}
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{
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// use ArenaReader
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ArenaReader reader(Arena(), value, IncludeVersion());
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std::vector<OldStruct> data;
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reader >> data;
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ASSERT_EQ(data.size(), numObjects);
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for (const auto& oldObject : data) {
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ASSERT(oldObject.isSet());
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}
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}
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}
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} // namespace
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TEST_CASE("flow/serialize/Downgrade/WriteOld") {
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BinaryWriter writer(IncludeVersion(g_network->protocolVersion()));
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auto const numObjects = deterministicRandom()->randomInt(1, 101);
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std::vector<OldStruct> data(numObjects);
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for (auto& oldObject : data) {
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oldObject.setFields();
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}
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writer << data;
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verifyData(writer.toValue(), numObjects);
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return Void();
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}
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// Verify that old code will still be able to read the values of the struct it knows about, even if we add a new field
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// and write a message with new code.
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TEST_CASE("flow/serialize/Downgrade/WriteNew") {
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auto protocolVersion = g_network->protocolVersion();
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protocolVersion.addObjectSerializerFlag();
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ObjectWriter writer(IncludeVersion(protocolVersion));
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auto const numObjects = deterministicRandom()->randomInt(1, 101);
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std::vector<NewStruct> data(numObjects);
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for (auto& newObject : data) {
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newObject.setFields();
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}
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writer.serialize(data);
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verifyData(writer.toStringRef(), numObjects);
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return Void();
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}
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