推广一下支持 proto3 的 protobuf 生成工具，欢迎来找虫

失业在家，把原来用到的 protobuf 工具代码整理了一下，发个支持 proto3 的生成工具，目前只支持 proto3 格式生成的 Marshal 、MarshalTo 和 Unmarshal 方法参考 gogoprotobuf 的实现。

地址：https://github.com/billyplus/fastproto

Marshal message

    msg := &pb.SomeProtoMsg{}
    if err := fastproto.Marshal(msg); err!=nil {}

    // 预告分配好空间
    data := make([]byte, msg.Size())
    if n, err := fastproto.MarshalTo(data, msg); err!=nil {}
    // 可以用 data[:n]获取结果

Unmarshal message

    msg := &pb.SomeProtoMsg{}
    if err := fastproto.Unmarshal(data, &msg); err!=nil {}

性能对比

提升有 30%到 70%

goos: linux
goarch: amd64
pkg: github.com/billyplus/fastproto/test
cpu: AMD Ryzen 9 5950X 16-Core Processor            
  |                                  |          |              |            |                |
  | -------------------------------- | -------- | ------------ | ---------- | -------------- |
  | **FastMarshalStringSlice-6**     | 14644707 | 81.75 ns/op  | 80 B/op    | 1 allocs/op    |
  | StandardMarshalStringSlice-6     | 8223910  | 144.4 ns/op  | 80 B/op    | 1 allocs/op    |
  | **FastMarshalBytesSlice-6**      | 13065022 | 93.40 ns/op  | 80 B/op    | 1 allocs/op    |
  | StandardMarshalBytesSlice-6      | 10043254 | 124.9 ns/op  | 80 B/op    | 1 allocs/op    |
  | **FastMarshalInt32Slice-6**      | 5772819  | 213.1 ns/op  | 128 B/op   | 1 allocs/op    |
  | StandardMarshalInt32Slice-6      | 5056791  | 237.5 ns/op  | 128 B/op   | 1 allocs/op    |
  | **FastMarshalSint64Slice-6**     | 4123633  | 288.3 ns/op  | 224 B/op   | 1 allocs/op    |
  | StandardMarshalSint64Slice-6     | 3811389  | 311.4 ns/op  | 224 B/op   | 1 allocs/op    |
  | **FastMarshalSfixed32Slice-6**   | 16257074 | 73.97 ns/op  | 112 B/op   | 1 allocs/op    |
  | StandardMarshalSfixed32Slice-6   | 12917850 | 93.63 ns/op  | 112 B/op   | 1 allocs/op    |
  | **FastMarshalSfixed64Slice-6**   | 14003510 | 89.69 ns/op  | 208 B/op   | 1 allocs/op    |
  | StandardMarshalSfixed64Slice-6   | 11058189 | 115.9 ns/op  | 208 B/op   | 1 allocs/op    |
  | **FastMarshalToMixedProto-6**    | 74734    | 15354 ns/op  | 0 B/op     | 0 allocs/op    |
  | **FastMarshalMixedProto-6**      | 43844    | 27804 ns/op  | 18432 B/op | 1 allocs/op    |
  | StandardMarshalMixedProto-6      | 12552    | 94428 ns/op  | 37664 B/op | 1521 allocs/op |
  | **FastSizeMixedProto-6**         | 205432   | 6061 ns/op   | 0 B/op     | 0 allocs/op    |
  | StandardSizeMixedProto-6         | 32412    | 39230 ns/op  | 9616 B/op  | 760 allocs/op  |
  | **FastUnmarshalStringSlice-6**   | 4322337  | 291.3 ns/op  | 314 B/op   | 7 allocs/op    |
  | StandardUnmarshalStringSlice-6   | 3088686  | 384.5 ns/op  | 314 B/op   | 7 allocs/op    |
  | **FastUnmarshalBytesSlice-6**    | 3194150  | 376.0 ns/op  | 448 B/op   | 8 allocs/op    |
  | StandardUnmarshalBytesSlice-6    | 2770154  | 426.6 ns/op  | 448 B/op   | 8 allocs/op    |
  | **FastUnmarshalInt32Slice-6**    | 6377149  | 183.2 ns/op  | 112 B/op   | 1 allocs/op    |
  | StandardUnmarshalInt32Slice-6    | 3752682  | 318.7 ns/op  | 248 B/op   | 5 allocs/op    |
  | **FastUnmarshalSint64Slice-6**   | 4416526  | 271.5 ns/op  | 208 B/op   | 1 allocs/op    |
  | StandardUnmarshalSint64Slice-6   | 2903524  | 405.0 ns/op  | 504 B/op   | 6 allocs/op    |
  | **FastUnmarshalSfixed32Slice-6** | 14313001 | 85.07 ns/op  | 112 B/op   | 1 allocs/op    |
  | StandardUnmarshalSfixed32Slice-6 | 5353230  | 224.2 ns/op  | 248 B/op   | 5 allocs/op    |
  | **FastUnmarshalSfixed64Slice-6** | 12808696 | 103.0 ns/op  | 208 B/op   | 1 allocs/op    |
  | StandardUnmarshalSfixed64Slice-6 | 3824290  | 317.3 ns/op  | 504 B/op   | 6 allocs/op    |
  | **FastUnmarshalMixedProto-6**    | 20580    | 58110 ns/op  | 46909 B/op | 606 allocs/op  |
  | StandardUnmarshalMixedProto-6    | 8949     | 132525 ns/op | 60842 B/op | 1966 allocs/op |