| // 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 "kudu/util/jsonwriter.h" |
| |
| #include <string> |
| #include <vector> |
| |
| #include <glog/logging.h> |
| #include <google/protobuf/descriptor.h> |
| #include <google/protobuf/message.h> |
| #include <rapidjson/prettywriter.h> |
| #include <rapidjson/rapidjson.h> |
| |
| using google::protobuf::FieldDescriptor; |
| using google::protobuf::Message; |
| using google::protobuf::Reflection; |
| |
| using std::string; |
| using std::stringstream; |
| using std::vector; |
| |
| namespace kudu { |
| |
| // Adapter to allow RapidJSON to write directly to a stringstream. |
| // Since Squeasel exposes a stringstream as its interface, this is needed to avoid overcopying. |
| class UTF8StringStreamBuffer { |
| public: |
| explicit UTF8StringStreamBuffer(std::stringstream* out); |
| void Put(rapidjson::UTF8<>::Ch c); |
| private: |
| std::stringstream* out_; |
| }; |
| |
| // rapidjson doesn't provide any common interface between the PrettyWriter and |
| // Writer classes. So, we create our own pure virtual interface here, and then |
| // use JsonWriterImpl<T> below to make the two different rapidjson implementations |
| // correspond to this subclass. |
| class JsonWriterIf { |
| public: |
| virtual void Null() = 0; |
| virtual void Bool(bool b) = 0; |
| virtual void Int(int i) = 0; |
| virtual void Uint(unsigned u) = 0; |
| virtual void Int64(int64_t i64) = 0; |
| virtual void Uint64(uint64_t u64) = 0; |
| virtual void Double(double d) = 0; |
| virtual void String(const char* str, size_t length) = 0; |
| virtual void String(const char* str) = 0; |
| virtual void String(const std::string& str) = 0; |
| |
| virtual void StartObject() = 0; |
| virtual void EndObject() = 0; |
| virtual void StartArray() = 0; |
| virtual void EndArray() = 0; |
| |
| virtual ~JsonWriterIf() {} |
| }; |
| |
| // Adapts the different rapidjson Writer implementations to our virtual |
| // interface above. |
| template<class T> |
| class JsonWriterImpl : public JsonWriterIf { |
| public: |
| explicit JsonWriterImpl(stringstream* out); |
| |
| virtual void Null() OVERRIDE; |
| virtual void Bool(bool b) OVERRIDE; |
| virtual void Int(int i) OVERRIDE; |
| virtual void Uint(unsigned u) OVERRIDE; |
| virtual void Int64(int64_t i64) OVERRIDE; |
| virtual void Uint64(uint64_t u64) OVERRIDE; |
| virtual void Double(double d) OVERRIDE; |
| virtual void String(const char* str, size_t length) OVERRIDE; |
| virtual void String(const char* str) OVERRIDE; |
| virtual void String(const std::string& str) OVERRIDE; |
| |
| virtual void StartObject() OVERRIDE; |
| virtual void EndObject() OVERRIDE; |
| virtual void StartArray() OVERRIDE; |
| virtual void EndArray() OVERRIDE; |
| |
| private: |
| UTF8StringStreamBuffer stream_; |
| T writer_; |
| DISALLOW_COPY_AND_ASSIGN(JsonWriterImpl); |
| }; |
| |
| // |
| // JsonWriter |
| // |
| |
| typedef rapidjson::PrettyWriter<UTF8StringStreamBuffer> PrettyWriterClass; |
| typedef rapidjson::Writer<UTF8StringStreamBuffer> CompactWriterClass; |
| |
| JsonWriter::JsonWriter(stringstream* out, Mode m) { |
| switch (m) { |
| case PRETTY: |
| impl_.reset(new JsonWriterImpl<PrettyWriterClass>(DCHECK_NOTNULL(out))); |
| break; |
| case COMPACT: |
| impl_.reset(new JsonWriterImpl<CompactWriterClass>(DCHECK_NOTNULL(out))); |
| break; |
| } |
| } |
| JsonWriter::~JsonWriter() { |
| } |
| void JsonWriter::Null() { impl_->Null(); } |
| void JsonWriter::Bool(bool b) { impl_->Bool(b); } |
| void JsonWriter::Int(int i) { impl_->Int(i); } |
| void JsonWriter::Uint(unsigned u) { impl_->Uint(u); } |
| void JsonWriter::Int64(int64_t i64) { impl_->Int64(i64); } |
| void JsonWriter::Uint64(uint64_t u64) { impl_->Uint64(u64); } |
| void JsonWriter::Double(double d) { impl_->Double(d); } |
| void JsonWriter::String(const char* str, size_t length) { impl_->String(str, length); } |
| void JsonWriter::String(const char* str) { impl_->String(str); } |
| void JsonWriter::String(const string& str) { impl_->String(str); } |
| void JsonWriter::StartObject() { impl_->StartObject(); } |
| void JsonWriter::EndObject() { impl_->EndObject(); } |
| void JsonWriter::StartArray() { impl_->StartArray(); } |
| void JsonWriter::EndArray() { impl_->EndArray(); } |
| |
| // Specializations for common primitive metric types. |
| template<> void JsonWriter::Value(const bool& val) { |
| Bool(val); |
| } |
| template<> void JsonWriter::Value(const int32_t& val) { |
| Int(val); |
| } |
| template<> void JsonWriter::Value(const uint32_t& val) { |
| Uint(val); |
| } |
| template<> void JsonWriter::Value(const int64_t& val) { |
| Int64(val); |
| } |
| template<> void JsonWriter::Value(const uint64_t& val) { |
| Uint64(val); |
| } |
| template<> void JsonWriter::Value(const double& val) { |
| Double(val); |
| } |
| template<> void JsonWriter::Value(const string& val) { |
| String(val); |
| } |
| |
| #if defined(__APPLE__) |
| template<> void JsonWriter::Value(const size_t& val) { |
| Uint64(val); |
| } |
| #endif |
| |
| void JsonWriter::Protobuf(const Message& pb) { |
| const Reflection* reflection = pb.GetReflection(); |
| vector<const FieldDescriptor*> fields; |
| reflection->ListFields(pb, &fields); |
| |
| StartObject(); |
| for (const FieldDescriptor* field : fields) { |
| String(field->name()); |
| if (field->is_repeated()) { |
| StartArray(); |
| for (int i = 0; i < reflection->FieldSize(pb, field); i++) { |
| ProtobufRepeatedField(pb, field, i); |
| } |
| EndArray(); |
| } else { |
| ProtobufField(pb, field); |
| } |
| } |
| EndObject(); |
| } |
| |
| void JsonWriter::ProtobufField(const Message& pb, const FieldDescriptor* field) { |
| const Reflection* reflection = pb.GetReflection(); |
| switch (field->cpp_type()) { |
| case FieldDescriptor::CPPTYPE_INT32: |
| Int(reflection->GetInt32(pb, field)); |
| break; |
| case FieldDescriptor::CPPTYPE_INT64: |
| Int64(reflection->GetInt64(pb, field)); |
| break; |
| case FieldDescriptor::CPPTYPE_UINT32: |
| Uint(reflection->GetUInt32(pb, field)); |
| break; |
| case FieldDescriptor::CPPTYPE_UINT64: |
| Uint64(reflection->GetUInt64(pb, field)); |
| break; |
| case FieldDescriptor::CPPTYPE_DOUBLE: |
| Double(reflection->GetDouble(pb, field)); |
| break; |
| case FieldDescriptor::CPPTYPE_FLOAT: |
| Double(reflection->GetFloat(pb, field)); |
| break; |
| case FieldDescriptor::CPPTYPE_BOOL: |
| Bool(reflection->GetBool(pb, field)); |
| break; |
| case FieldDescriptor::CPPTYPE_ENUM: |
| String(reflection->GetEnum(pb, field)->name()); |
| break; |
| case FieldDescriptor::CPPTYPE_STRING: |
| String(reflection->GetString(pb, field)); |
| break; |
| case FieldDescriptor::CPPTYPE_MESSAGE: |
| Protobuf(reflection->GetMessage(pb, field)); |
| break; |
| default: |
| LOG(FATAL) << "Unknown cpp_type: " << field->cpp_type(); |
| } |
| } |
| |
| void JsonWriter::ProtobufRepeatedField(const Message& pb, const FieldDescriptor* field, int index) { |
| const Reflection* reflection = pb.GetReflection(); |
| switch (field->cpp_type()) { |
| case FieldDescriptor::CPPTYPE_INT32: |
| Int(reflection->GetRepeatedInt32(pb, field, index)); |
| break; |
| case FieldDescriptor::CPPTYPE_INT64: |
| Int64(reflection->GetRepeatedInt64(pb, field, index)); |
| break; |
| case FieldDescriptor::CPPTYPE_UINT32: |
| Uint(reflection->GetRepeatedUInt32(pb, field, index)); |
| break; |
| case FieldDescriptor::CPPTYPE_UINT64: |
| Uint64(reflection->GetRepeatedUInt64(pb, field, index)); |
| break; |
| case FieldDescriptor::CPPTYPE_DOUBLE: |
| Double(reflection->GetRepeatedDouble(pb, field, index)); |
| break; |
| case FieldDescriptor::CPPTYPE_FLOAT: |
| Double(reflection->GetRepeatedFloat(pb, field, index)); |
| break; |
| case FieldDescriptor::CPPTYPE_BOOL: |
| Bool(reflection->GetRepeatedBool(pb, field, index)); |
| break; |
| case FieldDescriptor::CPPTYPE_ENUM: |
| String(reflection->GetRepeatedEnum(pb, field, index)->name()); |
| break; |
| case FieldDescriptor::CPPTYPE_STRING: |
| String(reflection->GetRepeatedString(pb, field, index)); |
| break; |
| case FieldDescriptor::CPPTYPE_MESSAGE: |
| Protobuf(reflection->GetRepeatedMessage(pb, field, index)); |
| break; |
| default: |
| LOG(FATAL) << "Unknown cpp_type: " << field->cpp_type(); |
| } |
| } |
| |
| string JsonWriter::ToJson(const Message& pb, Mode mode) { |
| stringstream stream; |
| JsonWriter writer(&stream, mode); |
| writer.Protobuf(pb); |
| return stream.str(); |
| } |
| |
| // |
| // UTF8StringStreamBuffer |
| // |
| |
| UTF8StringStreamBuffer::UTF8StringStreamBuffer(std::stringstream* out) |
| : out_(DCHECK_NOTNULL(out)) { |
| } |
| |
| void UTF8StringStreamBuffer::Put(rapidjson::UTF8<>::Ch c) { |
| out_->put(c); |
| } |
| |
| // |
| // JsonWriterImpl: simply forward to the underlying implementation. |
| // |
| |
| template<class T> |
| JsonWriterImpl<T>::JsonWriterImpl(stringstream* out) |
| : stream_(DCHECK_NOTNULL(out)), |
| writer_(stream_) { |
| } |
| template<class T> |
| void JsonWriterImpl<T>::Null() { writer_.Null(); } |
| template<class T> |
| void JsonWriterImpl<T>::Bool(bool b) { writer_.Bool(b); } |
| template<class T> |
| void JsonWriterImpl<T>::Int(int i) { writer_.Int(i); } |
| template<class T> |
| void JsonWriterImpl<T>::Uint(unsigned u) { writer_.Uint(u); } |
| template<class T> |
| void JsonWriterImpl<T>::Int64(int64_t i64) { writer_.Int64(i64); } |
| template<class T> |
| void JsonWriterImpl<T>::Uint64(uint64_t u64) { writer_.Uint64(u64); } |
| template<class T> |
| void JsonWriterImpl<T>::Double(double d) { writer_.Double(d); } |
| template<class T> |
| void JsonWriterImpl<T>::String(const char* str, size_t length) { writer_.String(str, length); } |
| template<class T> |
| void JsonWriterImpl<T>::String(const char* str) { writer_.String(str); } |
| template<class T> |
| void JsonWriterImpl<T>::String(const string& str) { writer_.String(str.c_str(), str.length()); } |
| template<class T> |
| void JsonWriterImpl<T>::StartObject() { writer_.StartObject(); } |
| template<class T> |
| void JsonWriterImpl<T>::EndObject() { writer_.EndObject(); } |
| template<class T> |
| void JsonWriterImpl<T>::StartArray() { writer_.StartArray(); } |
| template<class T> |
| void JsonWriterImpl<T>::EndArray() { writer_.EndArray(); } |
| |
| } // namespace kudu |