eigenein/protobuf

Python implementation of Protocol Buffers with dataclass-based schemaʼs

pure-protobuf

Wow! Such annotated! Very buffers!

Documentation

Quick examples

.proto definition

It's not needed for pure-protobuf, but for the sake of an example, let's consider the following definition:

syntax = "proto3";

message SearchRequest {
  string query = 1;
  int32 page_number = 2;
  int32 result_per_page = 3;
}

And here's the same via pure-protobuf:

With dataclasses

from dataclasses import dataclass
from io import BytesIO

from pure_protobuf.annotations import Field
from pure_protobuf.message import BaseMessage
from typing_extensions import Annotated


@dataclass
class SearchRequest(BaseMessage):
    query: Annotated[str, Field(1)] = ""
    page_number: Annotated[int, Field(2)] = 0
    result_per_page: Annotated[int, Field(3)] = 0


request = SearchRequest(query="hello", page_number=1, result_per_page=10)
buffer = bytes(request)
assert buffer == b"\x0A\x05hello\x10\x01\x18\x0A"
assert SearchRequest.read_from(BytesIO(buffer)) == request

With pydantic

from io import BytesIO

from pure_protobuf.annotations import Field
from pure_protobuf.message import BaseMessage
from pydantic import BaseModel
from typing_extensions import Annotated


class SearchRequest(BaseMessage, BaseModel):
    query: Annotated[str, Field(1)] = ""
    page_number: Annotated[int, Field(2)] = 0
    result_per_page: Annotated[int, Field(3)] = 0


request = SearchRequest(query="hello", page_number=1, result_per_page=10)
buffer = bytes(request)
assert buffer == b"\x0A\x05hello\x10\x01\x18\x0A"
assert SearchRequest.read_from(BytesIO(buffer)) == request