Protomodel

Python Library to generate proto buffer code from python using type annotations

Installation

Create a virtual enviroment (Optional)

python -m venv venv
source venv/bin/activate # venv/Scripts/activate on Windows

Install package (require python ^3.10 version)

pip install protomodel

Example

Create a python file and add the following code:

from protomodel import message, service, rpc


@message
class HelloRequest:
    name: str

@message
class HelloReply:
    message: str

@service
class Greeter:

    @rpc
    def say_hello(hello_request: HelloRequest) -> HelloReply:
        pass

Generate file

Run the following command to generate a proto buffer file:

python -m protomodel generate --python_file=hello.py --proto_name=hello.proto

And then you will get the following result:

syntax = "proto3";

message HelloRequest {
  string name = 1;
}

message HelloReply {
  string message = 1;
}

service Greeter {
  rpc SayHello (HelloRequest) returns (HelloReply) {}
}

Add a package name:

python -m protomodel generate --python_file=hello.py \
--proto_name=hello.proto --package_name=my_package_name

syntax = "proto3";

package my_package_name;

...

Adding another types

Python Code:

@message
class Item:
    id: int
    name: str
    description: str
    price: float
    enabled: bool

@message
class ItemsList:
    items: list[Item]

Result:

message Item {
  int32 id = 1;
  string name = 2;
  string description = 3;
  double price = 4;
  bool enabled = 5;
}

message ItemsList {
  repeated Item items = 1;
}