Typing stubs for Protobuf

import os
from google.protobuf.timestamp_pb2 import Timestamp # A well-known type

# --- Simulate generated _pb2.py content for a custom message ---
# In a real scenario, this would come from `my_message_pb2.py`
# generated by `protoc --python_out=. my_message.proto`

# my_message.proto content:
# syntax = "proto3";
# package mypackage;
# message MyMessage {
#   string name = 1;
#   int32 id = 2;
#   repeated string tags = 3;
# }

# Simplified representation for quickstart (type checkers would use real stubs)
class MyMessage:
    name: str
    id: int
    tags: list[str]

    def __init__(self, name: str = '', id: int = 0, tags: list[str] | None = None) -> None:
        self.name = name
        self.id = id
        self.tags = tags if tags is not None else []

    def SerializeToString(self) -> bytes:
        return b""

    @classmethod
    def ParseFromString(cls, serialized_data: bytes) -> 'MyMessage':
        return cls()
# --- End simulated content ---


def process_message(msg: MyMessage) -> str:
    """Processes a custom protobuf message with type hints."""
    print(f"Processing Message: Name={msg.name}, ID={msg.id}")
    return f"Message with {len(msg.tags)} tags processed."

def get_current_timestamp() -> Timestamp:
    """Gets the current UTC timestamp using google.protobuf.Timestamp."""
    ts = Timestamp()
    ts.GetCurrentTime()
    return ts

# Example Usage:
my_instance = MyMessage(name="ExampleUser", id=42, tags=["dev", "python"])
result = process_message(my_instance)
print(result)

timestamp_obj = get_current_timestamp()
print(f"Current UTC Timestamp: {timestamp_obj}")