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[C++] Support protobuf native schema (#11388)
* Add C++ ProtobufNativeSchema implementation * Add tests for ProtobufNativeSchema * Fix schema type error and add tests for protobuf native schema * Upgrade pulsar-build image's protobuf to 3.17.1 * Update protobuf dependency version in documents * Add missed comments * Fix CentOS 7 build
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,35 @@ | ||
| /** | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF licenses this file | ||
| * to you under the Apache License, Version 2.0 (the | ||
| * "License"); you may not use this file except in compliance | ||
| * with the License. You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, | ||
| * software distributed under the License is distributed on an | ||
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
| * KIND, either express or implied. See the License for the | ||
| * specific language governing permissions and limitations | ||
| * under the License. | ||
| */ | ||
| #pragma once | ||
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| #include <pulsar/Schema.h> | ||
| #include <google/protobuf/descriptor.h> | ||
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| namespace pulsar { | ||
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| /** | ||
| * Create a protobuf native schema using a descriptor. | ||
| * | ||
| * @param descriptor the Descriptor object of the target class | ||
| * @return the protobuf native schema | ||
| * @throw std::invalid_argument if descriptor is nullptr | ||
| */ | ||
| PULSAR_PUBLIC SchemaInfo createProtobufNativeSchema(const google::protobuf::Descriptor* descriptor); | ||
|
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| } // namespace pulsar |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,71 @@ | ||
| /** | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF licenses this file | ||
| * to you under the Apache License, Version 2.0 (the | ||
| * "License"); you may not use this file except in compliance | ||
| * with the License. You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, | ||
| * software distributed under the License is distributed on an | ||
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
| * KIND, either express or implied. See the License for the | ||
| * specific language governing permissions and limitations | ||
| * under the License. | ||
| */ | ||
| #include "pulsar/ProtobufNativeSchema.h" | ||
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| #include <stdexcept> | ||
| #include <vector> | ||
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| #include <boost/archive/iterators/base64_from_binary.hpp> | ||
| #include <boost/archive/iterators/transform_width.hpp> | ||
| #include <google/protobuf/descriptor.pb.h> | ||
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| using google::protobuf::FileDescriptor; | ||
| using google::protobuf::FileDescriptorSet; | ||
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| namespace pulsar { | ||
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| void internalCollectFileDescriptors(const FileDescriptor* fileDescriptor, | ||
| FileDescriptorSet& fileDescriptorSet); | ||
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| SchemaInfo createProtobufNativeSchema(const google::protobuf::Descriptor* descriptor) { | ||
| if (!descriptor) { | ||
| throw std::invalid_argument("descriptor is null"); | ||
| } | ||
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| const auto fileDescriptor = descriptor->file(); | ||
| const std::string rootMessageTypeName = descriptor->full_name(); | ||
| const std::string rootFileDescriptorName = fileDescriptor->name(); | ||
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| FileDescriptorSet fileDescriptorSet; | ||
| internalCollectFileDescriptors(fileDescriptor, fileDescriptorSet); | ||
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| using namespace boost::archive::iterators; | ||
| using base64 = base64_from_binary<transform_width<const char*, 6, 8>>; | ||
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| std::vector<char> bytes(fileDescriptorSet.ByteSizeLong()); | ||
| fileDescriptorSet.SerializeToArray(bytes.data(), bytes.size()); | ||
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| const std::string schemaJson = | ||
| R"({"fileDescriptorSet":")" + std::string(base64(bytes.data()), base64(bytes.data() + bytes.size())) + | ||
| R"(","rootMessageTypeName":")" + rootMessageTypeName + | ||
| R"(","rootFileDescriptorName":")" + rootFileDescriptorName + R"("})"; | ||
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| return SchemaInfo(SchemaType::PROTOBUF_NATIVE, "", schemaJson); | ||
| } | ||
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| void internalCollectFileDescriptors(const FileDescriptor* fileDescriptor, | ||
| FileDescriptorSet& fileDescriptorSet) { | ||
| fileDescriptor->CopyTo(fileDescriptorSet.add_file()); | ||
| for (int i = 0; i < fileDescriptor->dependency_count(); i++) { | ||
| // collect the file descriptors recursively | ||
| internalCollectFileDescriptors(fileDescriptor->dependency(i), fileDescriptorSet); | ||
| } | ||
| } | ||
|
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| } // namespace pulsar |
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