reHDDPrinter/reHDDPrinter.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

""" Author:                     Hendrik Schutter, localhorst@mosad.xyz
    Date of creation:           2022/11/23
    Date of last modification:  2025/06/15
"""

import ctypes
import os
import time
import signal
import argparse
import warnings
import logging
from PIL import Image
from brother_ql.brother_ql_create import create_label
from brother_ql.raster import BrotherQLRaster
import layouter

# Suppress deprecation and printer warnings
warnings.filterwarnings("ignore", category=DeprecationWarning)
logging.getLogger("brother_ql").setLevel(logging.ERROR)

# Constants
STR_BUFFER_SIZE = 64
MSG_QUEUE_KEY = 0x1B11193C0
IPC_CREAT = 0o1000

file_name = "output.png"
printer_path = "/dev/usb/lp0"

terminate = False


class TDriveData(ctypes.Structure):
    _fields_ = [
        ("caDriveIndex", ctypes.c_char * STR_BUFFER_SIZE),
        ("caDriveHours", ctypes.c_char * STR_BUFFER_SIZE),
        ("caDriveCycles", ctypes.c_char * STR_BUFFER_SIZE),
        ("caDriveErrors", ctypes.c_char * STR_BUFFER_SIZE),
        ("caDriveShredTimestamp", ctypes.c_char * STR_BUFFER_SIZE),
        ("caDriveShredDuration", ctypes.c_char * STR_BUFFER_SIZE),
        ("caDriveCapacity", ctypes.c_char * STR_BUFFER_SIZE),
        ("caDriveState", ctypes.c_char * STR_BUFFER_SIZE),
        ("caDriveModelFamily", ctypes.c_char * STR_BUFFER_SIZE),
        ("caDriveModelName", ctypes.c_char * STR_BUFFER_SIZE),
        ("caDriveSerialnumber", ctypes.c_char * STR_BUFFER_SIZE),
        ("caDriveReHddVersion", ctypes.c_char * STR_BUFFER_SIZE),
    ]


class TMsgQueueData(ctypes.Structure):
    _fields_ = [
        ("msg_queue_type", ctypes.c_long),
        ("driveData", TDriveData),
    ]


# IPC bindings
libc = ctypes.CDLL("libc.so.6")
msgget = libc.msgget
msgrcv = libc.msgrcv

msgget.argtypes = [ctypes.c_int, ctypes.c_int]
msgget.restype = ctypes.c_int

msgrcv.argtypes = [
    ctypes.c_int,
    ctypes.POINTER(TMsgQueueData),
    ctypes.c_size_t,
    ctypes.c_long,
    ctypes.c_int,
]
msgrcv.restype = ctypes.c_ssize_t


def signal_handler(signum, frame):
    global terminate
    print(f"Signal {signum} received, terminating...")
    terminate = True


signal.signal(signal.SIGINT, signal_handler)
signal.signal(signal.SIGTERM, signal_handler)


def wait_for_printer():
    while not os.path.exists(printer_path):
        print("Printer not found, waiting ...")
        time.sleep(30)
    return True


def create_drive_objects(drive_info):
    """Convert dictionary to layouter-compatible DriveData and ReHddInfo objects"""
    drive = layouter.DriveData(
        drive_index=int(drive_info["driveIndex"]),
        drive_state=drive_info["driveState"],
        modelfamily=drive_info["driveModelFamily"],
        modelname=drive_info["driveModelName"],
        capacity=int(drive_info["driveCapacity"]),
        serialnumber=drive_info["driveSerialnumber"],
        power_on_hours=int(drive_info["driveHours"]),
        power_cycle=int(drive_info["driveCycles"]),
        smart_error_count=int(drive_info["driveErrors"]),
        shred_timestamp=int(drive_info["driveShredTimestamp"]),
        shred_duration=int(drive_info["driveShredDuration"]),
    )

    rehdd_info = layouter.ReHddInfo(
        link="https://git.mosad.xyz/localhorst/reHDD",
        version=drive_info["driveReHddVersion"],
    )

    return drive, rehdd_info


def worker(queue_id, test_mode=False):
    try:
        while not terminate:
            if test_mode:
                drive_info = {
                    "driveIndex": "42",
                    "driveHours": 44,
                    "driveCycles": 45,
                    "driveErrors": 43,
                    "driveShredTimestamp": int(time.time()),
                    "driveShredDuration": 0,
                    "driveCapacity": 42,
                    "driveState": "shredded",
                    "driveModelFamily": "modelFamily",
                    "driveModelName": "modelName",
                    "driveSerialnumber": "serial",
                    "driveReHddVersion": "V1.1.2",
                }
            else:
                msg = TMsgQueueData()
                result = msgrcv(
                    queue_id,
                    ctypes.byref(msg),
                    ctypes.sizeof(TMsgQueueData) - ctypes.sizeof(ctypes.c_long),
                    0,
                    0,
                )
                if result == -1:
                    err = ctypes.get_errno()
                    print(f"Error reading from message queue: {os.strerror(err)}")
                    break

                d = msg.driveData
                drive_info = {
                    "driveIndex": d.caDriveIndex.decode().strip("\x00"),
                    "driveHours": int(d.caDriveHours.decode().strip("\x00")),
                    "driveCycles": int(d.caDriveCycles.decode().strip("\x00")),
                    "driveErrors": int(d.caDriveErrors.decode().strip("\x00")),
                    "driveShredTimestamp": int(
                        d.caDriveShredTimestamp.decode().strip("\x00")
                    ),
                    "driveShredDuration": int(
                        d.caDriveShredDuration.decode().strip("\x00")
                    ),
                    "driveCapacity": int(d.caDriveCapacity.decode().strip("\x00")),
                    "driveState": d.caDriveState.decode().strip("\x00"),
                    "driveModelFamily": d.caDriveModelFamily.decode().strip("\x00"),
                    "driveModelName": d.caDriveModelName.decode().strip("\x00"),
                    "driveSerialnumber": d.caDriveSerialnumber.decode().strip("\x00"),
                    "driveReHddVersion": d.caDriveReHddVersion.decode().strip("\x00"),
                }

            print(f"Received Drive Data: {drive_info}")

            drive_obj, rehdd_info = create_drive_objects(drive_info)
            layouter.generate_image(drive_obj, rehdd_info, file_name)

            if wait_for_printer():
                qlr = BrotherQLRaster("QL-570")
                image = Image.open(file_name)
                create_label(qlr, image, "62")
                with open(printer_path, "wb") as file:
                    file.write(qlr.data)
                os.remove(file_name)
            else:
                print("Skipping printing due to printer unavailability.")

            if test_mode:
                break

    except Exception as e:
        print(f"Worker encountered an error: {e}")


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument(
        "--test", action="store_true", help="Run in test mode with fake data"
    )
    args = parser.parse_args()

    if args.test:
        print("Running in test mode.")
        worker(None, test_mode=True)
        return

    try:
        queue_id = msgget(MSG_QUEUE_KEY, 0)
        if queue_id == -1:
            raise RuntimeError("Failed to connect to the existing message queue.")

        worker(queue_id)
    except Exception as e:
        print(f"Main process encountered an error: {e}")


if __name__ == "__main__":
    main()