fastcc 4.0.3

Lightweight, efficient and developer-friendly framework for component communication

FastCC

Framework for component communication with MQTT and Protocol Buffers :boom:.

• Lightweight :zap:
• Efficient :rocket:
• Developer-friendly :technologist:

This framework is built on top of empicano's aiomqtt.

Example

# app.py
from __future__ import annotations

import asyncio
import contextlib
import logging
import os
import sys

import fastcc

router = fastcc.Router()


@router.route("greet")
async def greet(name: str, *, database: dict[str, int]) -> str:
    """Greet a user.

    Parameters
    ----------
    name
        The name of the user.
        Autofilled by fastcc.
    database
        The database.
        Autofilled by fastcc.

    Returns
    -------
    str
        The greeting message.
    """
    # ... do some async work
    await asyncio.sleep(0.1)

    database[name] += 1
    occurrence = database[name]
    return f"Hello, {name}! Saw you {occurrence} times!"


async def main() -> None:
    """Run the app."""
    logging.basicConfig(level=logging.INFO)

    database: dict[str, int] = {"Alice": 0, "Bob": 0}
    app = fastcc.FastCC("localhost")
    app.add_router(router)
    app.add_injector(database=database)
    app.add_exception_handler(
        KeyError,
        lambda e: fastcc.MQTTError(repr(e), 404),
    )

    await app.run()


# https://github.com/empicano/aiomqtt?tab=readme-ov-file#note-for-windows-users
if sys.platform.lower() == "win32" or os.name.lower() == "nt":
    asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())

with contextlib.suppress(KeyboardInterrupt):
    asyncio.run(main())

# client.py
from __future__ import annotations

import asyncio
import contextlib
import logging
import os
import sys

import fastcc

_logger = logging.getLogger(__name__)


async def main() -> None:
    """Run the app."""
    logging.basicConfig(level=logging.INFO)

    async with fastcc.Client("localhost") as client:
        try:
            response = await client.request(
                "greet",
                "Charlie",
                response_type=str,
            )
        except fastcc.MQTTError as e:
            details = f"An error occurred on the server: {e.message}"
            _logger.error(details)

        response = await client.request("greet", "Alice", response_type=str)
        _logger.info("response: %r", response)


# https://github.com/empicano/aiomqtt?tab=readme-ov-file#note-for-windows-users
if sys.platform.lower() == "win32" or os.name.lower() == "nt":
    asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())

with contextlib.suppress(KeyboardInterrupt):
    asyncio.run(main())