reHDDPrinter/dummy_receiver.py

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

"""Author:                     Hendrik Schutter, localhorst@mosad.xyz
Date of creation:           2025/12/05
Date of last modification:  2025/12/05
"""

import ctypes
import os
import time
import argparse

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

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 - enable errno support
libc = ctypes.CDLL("libc.so.6", use_errno=True)
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 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:
                time.sleep(3)
                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()
                print("Waiting for message from queue...")

                # Calculate message size - must match C++ side: sizeof(t_msgQueueData) - sizeof(long)
                # This is the size of the data portion (excluding msg_queue_type)
                msg_size = ctypes.sizeof(TMsgQueueData) - ctypes.sizeof(ctypes.c_long)

                print(f"Message size to receive: {msg_size} bytes")

                result = msgrcv(
                    queue_id,
                    ctypes.byref(msg),
                    msg_size,
                    0,  # msg type (0 = get first message)
                    0,  # flags (0 = blocking)
                )

                if result == -1:
                    err = ctypes.get_errno()
                    print(
                        f"Error reading from message queue: {os.strerror(err)} (errno: {err})"
                    )
                    break

                print(f"Received {result} bytes from queue")

                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}")
    except Exception as e:
        import traceback

        print(f"Worker encountered an error: {e}")
        traceback.print_exc()


def main():
    while True:
        try:
            # Create or connect to the message queue with IPC_CREAT flag
            # This matches the C++ sender's flags (IPC_CREAT | 0666)
            queue_id = msgget(MSG_QUEUE_KEY, IPC_CREAT | 0o666)
            if queue_id == -1:
                err = ctypes.get_errno()
                raise RuntimeError(
                    f"Failed to create/connect to the message queue: {os.strerror(err)}"
                )

            print(f"Successfully connected to message queue (ID: {queue_id})")
            worker(queue_id)
        except Exception as e:
            import traceback

            print(f"Main process encountered an error: {e}")
            traceback.print_exc()
            time.sleep(30)


if __name__ == "__main__":
    main()