架构►rpc

protobuf - c++

Descriptor & Reflection

message

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syntax = "proto3";

message Sea {
  string name = 1;
}

message World {
  int64 age = 1;
  repeated string tag = 2;
}

Descriptor & Reflection

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World wd{};

// protobuf 3
auto age = World::GetDescriptor()->FindFieldByName("age"); 
// protobuf 2
auto age = wd.GetDescriptor()->FindFieldByName("age"); 

// 设置单值
World::GetReflection->SetInt64(&wd, age, 10);
// 设置 repeated 字段
World::GetReflection()->AddString(&wd, tag, "a");
World::GetReflection()->AddString(&wd, tag, "b");
World::GetReflection()->SetRepeatedString(&wd, tag, 1, "c");

// 设置 submessage
wd.mutable_sea()->set_name("pacific");

Json

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#include <google/protobuf/util/json_util.h>

// message -> json
std::string output;
google::protobuf::util::MessageToJsonString(message, &output);

// json -> message
SomeMessage msg;
std::string input;
google::protobuf::util::MessageToJsonString(input, &msg);

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