grpc/test/cpp/util/proto_reflection_descriptor_database.h

/*
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#include <mutex>
#include <unordered_map>
#include <unordered_set>
#include <vector>

#include <google/protobuf/descriptor.h>
#include <google/protobuf/descriptor.pb.h>
#include <google/protobuf/descriptor_database.h>
#include <grpc++/grpc++.h>
#include <grpc++/impl/reflection.grpc.pb.h>

namespace grpc {

class ProtoReflectionDescriptorDatabase
    : public google::protobuf::DescriptorDatabase {
 public:
  explicit ProtoReflectionDescriptorDatabase(
      std::unique_ptr<reflection::v1alpha::ServerReflection::Stub> stub);

  explicit ProtoReflectionDescriptorDatabase(
      std::shared_ptr<grpc::Channel> channel);

  virtual ~ProtoReflectionDescriptorDatabase();

  // DescriptorDatabase methods
  bool FindFileByName(const string& filename,
                      google::protobuf::FileDescriptorProto* output)
      GRPC_OVERRIDE;

  bool FindFileContainingSymbol(const string& symbol_name,
                                google::protobuf::FileDescriptorProto* output)
      GRPC_OVERRIDE;

  bool FindFileContainingExtension(
      const string& containing_type, int field_number,
      google::protobuf::FileDescriptorProto* output) GRPC_OVERRIDE;

  bool FindAllExtensionNumbers(const string& extendee_type,
                               std::vector<int>* output) GRPC_OVERRIDE;

  bool GetServices(std::vector<std::string>* output);

  grpc::reflection::v1alpha::ServerReflection::Stub* stub() {
    return stub_.get();
  }

 private:
  typedef ClientReaderWriter<
      grpc::reflection::v1alpha::ServerReflectionRequest,
      grpc::reflection::v1alpha::ServerReflectionResponse>
      ClientStream;

  const google::protobuf::FileDescriptorProto ParseFileDescriptorProtoResponse(
      const std::string& byte_fd_proto);

  void AddFileFromResponse(
      const grpc::reflection::v1alpha::FileDescriptorResponse& response);

  const std::shared_ptr<ClientStream> GetStream();

  std::shared_ptr<ClientStream> stream_;
  grpc::ClientContext ctx_;
  std::unique_ptr<grpc::reflection::v1alpha::ServerReflection::Stub> stub_;
  std::unordered_set<string> known_files_;
  std::unordered_set<string> missing_symbols_;
  std::unordered_map<string, std::unordered_set<int>> missing_extensions_;
  std::unordered_map<string, std::vector<int>> cached_extension_numbers_;
  std::mutex stream_mutex_;

  google::protobuf::SimpleDescriptorDatabase cached_db_;
};

}  // namespace grpc