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<string, int32> scores = 5;
}

test.lua

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

local person = {
    name = "jinjiazh",
    id = 10001,
    email = "jinjiazh@qq.com",
    phones = {
        {number = "183****0402", type = PhoneType.HOME},
        {number = "186****9470", type = PhoneType.WORK},
    },
    scores = {
        ["Chinese"] = 82,
        ["Maths"] = 98,
        ["English"] = 88,
    }
}

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

local data = proto.pack("Person", person.name, person.id, person.email, person.phones, person.scores)
local name, id, email, phones, scores = 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)

Path Mapping

If you want to put *.proto files to other directory, you can use path mapping.

Example:

Directory Tree:

C:\my_project\
    proto\
        a.proto
    other_proto\
        b.proto
    run.exe
D:\any_directory\
    c.proto

Map path:

require "protolua"

-- Added by default, so there is no need to map "./" and "./proto/"
-- proto.map_path("", "./")
-- proto.map_path("", "./proto/")
proto.map_path("", "./other_proto/")
proto.map_path("", "D:\any_directory\")

-- Now, we can parse the proto files
proto.parse("a.proto")
proto.parse("b.proto")
proto.parse("c.proto")

Attention Please

lua51ext.h for int64

inline long long lua_toint64(lua_State *L, int idx)
{
    if (lua_type(L, idx) == LUA_TSTRING)
    {
        return atoll(lua_tostring(L, idx));
    }
    return (long long)lua_tonumber(L, idx);
}

inline void lua_pushint64(lua_State *L, long long value)
{
    // because of #define LUA_NUMBER_FMT "%.14g"
    if (abs(value) > 99999999999999)
    {
        char str[32];
        lua_pushstring(L, _i64toa(value, str, 10));
        return;
    }

    lua_pushnumber(L, (lua_Number)value);
}

Dependencies

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

Contact Me

QQ：164442955