Protocol Buffers for lua

https://github.com/jinjiazhang/protolua/

Overview

ProtoLua is a google protocol buffers C library for Lua which implement less than 1000 lines code. Parse proto2 or proto3 file dynamically without code generation, You can also redevelop it to support RPC like 'Advance Example'.

Quick Example

person.proto

syntax = "proto3";

message Person {
    string name = 1;
    int32 id = 2;
    string email = 3;
    
    enum PhoneType {
        MOBILE = 0;
        HOME = 1;
        WORK = 2;
    }
    
    message PhoneNumber {
        string number = 1;
        PhoneType type = 2;
    }
    
    repeated PhoneNumber phones = 4;
    map<int32, string> subjects = 5;
}

test.lua

require "protolua"
proto.parse("person.proto")

local player = {
    name = "jinjiazh",
    id = 10001,
    email = "[email protected]",
    phones = {
        {number = "1818864xxxx", type = 1},
        {number = "1868200xxxx", type = 2},
    },
    subjects = {
        [101] = "Chinese",
        [102] = "English",
        [103] = "Maths",
    }
}

local data = proto.encode("Person", player)
local clone = proto.decode("Person", data)

local data = proto.pack("Person", player.name, player.id, player.email, player.phones, player.subjects)
local name, id, email, phones, subjects = proto.unpack("Person", data)

Advance Example

syntax = "proto3";

message OnBuyItemReq {
    int32 goodsId = 1;
    int32 goodsNum = 2;
}

message OnBuyItemRsp {
    int32 retCode = 1;
    int32 goodsId = 2;
    int32 goodsNum = 3;
}

-- server code
function c2s.OnBuyItemReq( fd, goodsId, goodsNum )
    local player = FindPlayerByFd(fd)
    local retCode = shopMgr.BuyItem(player, goodsId, goodsNum)
    proto.CallClient(fd, "OnBuyItemRsp", retCode, goodsId, goodsNum)
end

-- client code
function s2c.OnBuyItemRsp( retCode, goodsId, goodsNum )
    print(retCode, goodsId, goodsNum)
end

proto.CallServer("OnBuyItemReq", 1021, 10)

Dependencies

lua-5.3.5: https://www.lua.org/ftp/lua-5.3.5.tar.gz
protobuf: https://github.com/google/protobuf