fix ipc api

Reviewed-on: #19

README.md

@@ -8,7 +8,7 @@
 
 ## Install ##
 
-`pip install qrcode sysv-ipc pycstruct brother-ql`
+`pip install qrcode brother-ql`
 
 ```
 cd /root/
@@ -33,8 +33,9 @@ systemctl enable --now /lib/systemd/system/reHDDPrinter.service
 - Brother QL-570
 - Paper With: 62mm or 696px
 
+**Hint: Some Brother printers have enabled standby mode. This will disconnect the printer. See [Issue #12](https://git.mosad.xyz/localhorst/reHDDPrinter/issues/12) to disable standby.**
 
-see https://github.com/pklaus/brother_ql
+see https://github.com/pklaus/brother_ql for details for printer access
 
 
 

layouter.py

@@ -1,9 +1,10 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
-""" Author:                     Hendrik Schutter, localhorst@mosad.xyz
-    Date of creation:           2022/11/16
-    Date of last modification:  2022/11/23
+"""
+Author:                     Hendrik Schutter, localhorst@mosad.xyz
+Date of creation:           2022/11/16
+Date of last modification:  2025/06/08
 """
 
 import re
@@ -11,197 +12,351 @@ import dataclasses
 import glob
 import datetime
 import json
+import logging
 import qrcode
-from PIL import Image
-from PIL import ImageFont
-from PIL import ImageDraw 
+from PIL import Image, ImageFont, ImageDraw
+
+# Constants
+FONT_PATH = "/usr/share/fonts"
+DEFAULT_FONT_REGULAR = "DejaVuSans.ttf"
+DEFAULT_FONT_BOLD = "DejaVuSans-Bold.ttf"
+OUTPUT_WIDTH = 696  # px
+OUTPUT_HEIGHT = 190  # px
+TEXT_X_OFFSET = 190  # px
+QR_CODE_SIZE = 179  # px
+# Configure logging
+logging.basicConfig(
+    level=logging.INFO, format="%(asctime)s - %(levelname)s - %(message)s"
+)
+
 
 @dataclasses.dataclass
 class DriveData:
     drive_index: int
-    drive_state: str #none, deleted, shredded
-    modelfamiliy: str
+    drive_state: str
+    modelfamily: str
     modelname: str
-    capacity: int #in bytes
+    capacity: int
     serialnumber: str
-    power_on_hours: int #in hours
+    power_on_hours: int
     power_cycle: int
     smart_error_count: int
-    shred_timestamp: int #unix timestamp
-    shred_duration: int #in seconds
+    shred_timestamp: int
+    shred_duration: int
+
+
+@dataclasses.dataclass
+class DriveDataJson:
+    state: str
+    fam: str
+    name: str
+    cap: int
+    sn: str
+    poh: int
+    pc: int
+    err: int
+    time: int
+    dur: int
+
 
 @dataclasses.dataclass
 class DriveDataPrintable:
-    modelfamiliy: str #max lenght 25
-    modelname: str #max lenght 25
-    capacity: str #max lenght 25, in human-readable format with unit (GB/TB)
-    serialnumber: str #max lenght 25
-    power_on_hours: str #max lenght 25, in hours and days and years
-    power_cycle: str #max lenght 25
-    smart_error_count: str #max lenght 25
-    shred_timestamp: str #max lenght 25, human-readable
-    shred_duration: str #max lenght 25, human-readable
+    modelfamily: str
+    modelname: str
+    capacity: str
+    serialnumber: str
+    power_on_hours: str
+    power_cycle: str
+    smart_error_count: str
+    shred_timestamp: str
+    shred_duration: str
+
 
 @dataclasses.dataclass
 class ReHddInfo:
     link: str
     version: str
 
+
 @dataclasses.dataclass
-class DriveDataJson:
-    drive: DriveData
+class QrDataJson:
+    drive: DriveDataJson
     rehdd: ReHddInfo
 
-def get_font_path_regular():
-    path = "/usr/share/fonts"
-    files = glob.glob(path + "/**/DejaVuSans.ttf", recursive = True)
-    return files[0]
 
-def get_font_path_bold():
-    path = "/usr/share/fonts"
-    files = glob.glob(path + "/**/DejaVuSans-Bold.ttf", recursive = True)
-    return files[0]
+def find_font_path(font_name):
+    """Finds the full path of the specified font."""
+    try:
+        files = glob.glob(f"{FONT_PATH}/**/{font_name}", recursive=True)
+        return files[0] if files else None
+    except Exception as e:
+        logging.error(f"Error locating font {font_name}: {e}")
+        return None
 
-def human_readable_capacity_1024(size, decimal_places=0):
-    for unit in ['B', 'KiB', 'MiB', 'GiB', 'TiB', 'PiB']:
-        if size < 1024.0 or unit == 'PiB':
-            break
-        size /= 1024.0
+
+def human_readable_capacity(size, decimal_places=0, base=1000):
+    """Converts bytes to a human-readable string."""
+    units = (
+        ["B", "KB", "MB", "GB", "TB", "PB"]
+        if base == 1000
+        else ["B", "KiB", "MiB", "GiB", "TiB", "PiB"]
+    )
+    for unit in units:
+        if size < base or unit == units[-1]:
             return f"{size:.{decimal_places}f} {unit}"
+        size /= base
 
-def human_readable_capacity_1000(size, decimal_places=0):
-    for unit in ['B', 'KB', 'MB', 'GB', 'TB', 'PB']:
-        if size < 1000.0 or unit == 'PB':
-            break
-        size /= 1000.0
-    return f"{size:.{decimal_places}f} {unit}"
 
-def human_readable_power_on_hours(hours, decimal_places=2):
-    return str(hours) + "h or " + str(int(hours/24)) + "d or " + str("{:.2f}".format(float(hours/24/365))) + "y"
+def human_readable_power_on_hours(hours):
+    """Converts hours to human-readable string in hours, days, and years."""
+    return (
+        str(hours)
+        + "h or "
+        + str(int(hours / 24))
+        + "d or "
+        + str("{:.2f}".format(float(hours / 24 / 365)))
+        + "y"
+    )
 
-def cut_string(max_lenght, data):
-    if (len(data) > max_lenght):
-        return data[0:(max_lenght-4)] + " ..."
-    else:
+
+def cut_string(max_length, data, direction="end"):
+    """Trims a string to the maximum length, adding ellipses if necessary."""
+    if len(data) > max_length:
+        return (
+            f"{data[:max_length-4]} ..."
+            if direction == "end"
+            else f"... {data[-(max_length-4):]}"
+        )
     return data
 
+
 def format_to_printable(drive):
     return DriveDataPrintable(
-        cut_string(20,  re.sub(r"[^a-zA-Z0-9. ]", "", drive.modelfamiliy)),\
-        cut_string(20,  re.sub(r"[^a-zA-Z0-9. ]", "", drive.modelname)),\
-        cut_string(20,  human_readable_capacity_1000(drive.capacity)),\
-        cut_string(16,  re.sub(r"[^a-zA-Z0-9.-_]", "", drive.serialnumber)),\
-        cut_string(30,  human_readable_power_on_hours(drive.power_on_hours)),\
-        cut_string(10,  str(drive.power_cycle)),\
-        cut_string(10,  str(drive.smart_error_count)),\
-        cut_string(30,  datetime.datetime.utcfromtimestamp(drive.shred_timestamp).strftime('%Y-%m-%d %H:%M:%S')),\
-        cut_string(30,  str(datetime.timedelta(seconds = drive.shred_duration))))
+        cut_string(20, re.sub(r"[^a-zA-Z0-9. ]", "", drive.modelfamily), "end"),
+        cut_string(20, re.sub(r"[^a-zA-Z0-9. ]", "", drive.modelname), "end"),
+        cut_string(20, human_readable_capacity(drive.capacity), "end"),
+        cut_string(20, re.sub(r"[^a-zA-Z0-9.-_]", "", drive.serialnumber), "start"),
+        cut_string(30, human_readable_power_on_hours(drive.power_on_hours), "end"),
+        cut_string(10, str(drive.power_cycle), "end"),
+        cut_string(10, str(drive.smart_error_count), "end"),
+        cut_string(
+            30,
+            datetime.datetime.fromtimestamp(
+                drive.shred_timestamp, datetime.UTC
+            ).strftime("%Y-%m-%d %H:%M:%S"),
+            "end",
+        ),
+        cut_string(30, str(datetime.timedelta(seconds=drive.shred_duration)), "end"),
+    )
 
-def draw_text(drawable, printable_data, text_x_offset):
-    try:
-        font_file_regular = get_font_path_regular()
-        font_file_bold = get_font_path_bold()
-    except Exception as ex:
-        print("unable to find font: " + str(ex))
-        return
 
-    font_size = 20
-    text_y_offset = 10
-    text_y_offset_increment = 25
-    value_colum_x_offset = 120
+def draw_text(drawable, printable_data, font_regular, font_bold, font_bold_bigger):
+    """Draws formatted text with Cycles and Errors on one row."""
 
-    drawable.text((text_x_offset, text_y_offset), printable_data.serialnumber,(0),font=ImageFont.truetype(font_file_bold, 30))
-    text_y_offset += 40
+    line_height = 26
+    label_x = TEXT_X_OFFSET
+    value_offset = 115
+    right_field_spacing = 200  # Horizontal gap between Cycles and Errors
+    x_capacity = 520
+    y_capacity = 142
+    y_start = 4
 
-    drawable.text((text_x_offset, text_y_offset), "Familiy: ",(0),font=ImageFont.truetype(font_file_bold, font_size))
-    drawable.text((text_x_offset+value_colum_x_offset, text_y_offset), printable_data.modelfamiliy,(0),font=ImageFont.truetype(font_file_regular, font_size))
-    text_y_offset += text_y_offset_increment
-    drawable.text((text_x_offset, text_y_offset), "Model: ",(0),font=ImageFont.truetype(font_file_bold, font_size))
-    drawable.text((text_x_offset+value_colum_x_offset, text_y_offset), printable_data.modelname,(0),font=ImageFont.truetype(font_file_regular, font_size))
-    text_y_offset += text_y_offset_increment
-    drawable.text((text_x_offset, text_y_offset), "Hours: " ,(0),font=ImageFont.truetype(font_file_bold, font_size))
-    drawable.text((text_x_offset+value_colum_x_offset, text_y_offset), printable_data.power_on_hours,(0),font=ImageFont.truetype(font_file_regular, font_size))
-    text_y_offset += text_y_offset_increment
-    drawable.text((text_x_offset, text_y_offset), "Cycles: ",(0),font=ImageFont.truetype(font_file_bold, font_size))
-    drawable.text((text_x_offset+value_colum_x_offset, text_y_offset), printable_data.power_cycle,(0),font=ImageFont.truetype(font_file_regular, font_size))
-    text_y_offset += text_y_offset_increment
-    drawable.text((text_x_offset, text_y_offset), "Errors: ", (0),font=ImageFont.truetype(font_file_bold, font_size))
-    drawable.text((text_x_offset+value_colum_x_offset, text_y_offset), printable_data.smart_error_count,(0),font=ImageFont.truetype(font_file_regular, font_size))
-    text_y_offset += text_y_offset_increment
-    drawable.text((text_x_offset, text_y_offset), "Shred on: ",(0),font=ImageFont.truetype(font_file_bold, font_size))
-    drawable.text((text_x_offset+value_colum_x_offset, text_y_offset), printable_data.shred_timestamp,(0),font=ImageFont.truetype(font_file_regular, font_size))
-    text_y_offset += text_y_offset_increment
-    drawable.text((text_x_offset, text_y_offset), "Duration: " ,(0),font=ImageFont.truetype(font_file_bold, font_size))
-    drawable.text((text_x_offset+value_colum_x_offset, text_y_offset), printable_data.shred_duration,(0),font=ImageFont.truetype(font_file_regular, font_size))
-    text_y_offset += text_y_offset_increment
+    # Serial Number
+    drawable.text((label_x, y_start), "Serial:", fill=0, font=font_bold)
+    drawable.text(
+        (label_x + value_offset, y_start),
+        printable_data.serialnumber,
+        fill=0,
+        font=font_bold,
+    )
 
-    drawable.text((text_x_offset, text_y_offset), printable_data.capacity,(0),font=ImageFont.truetype(font_file_bold, font_size*3))
+    y1 = y_start + line_height
+    y2 = y1 + line_height
+    y3 = y2 + line_height
+    y4 = y3 + line_height
+    y5 = y4 + line_height
+    y6 = y5 + line_height
+
+    # Left-Aligned Fields (One per row)
+    drawable.text((label_x, y1), "Family:", fill=0, font=font_bold)
+    drawable.text(
+        (label_x + value_offset, y1),
+        printable_data.modelfamily,
+        fill=0,
+        font=font_regular,
+    )
+
+    drawable.text((label_x, y2), "Model:", fill=0, font=font_bold)
+    drawable.text(
+        (label_x + value_offset, y2),
+        printable_data.modelname,
+        fill=0,
+        font=font_regular,
+    )
+
+    drawable.text((label_x, y3), "Hours:", fill=0, font=font_bold)
+    drawable.text(
+        (label_x + value_offset, y3),
+        printable_data.power_on_hours,
+        fill=0,
+        font=font_regular,
+    )
+
+    # Cycles and Errors on the same line
+    drawable.text((label_x, y4), "Cycles:", fill=0, font=font_bold)
+    drawable.text(
+        (label_x + value_offset, y4),
+        printable_data.power_cycle,
+        fill=0,
+        font=font_regular,
+    )
+
+    drawable.text(
+        (label_x + right_field_spacing, y4), "Errors:", fill=0, font=font_bold
+    )
+    drawable.text(
+        (label_x + right_field_spacing + value_offset, y4),
+        printable_data.smart_error_count,
+        fill=0,
+        font=font_regular,
+    )
+
+    # Continue remaining fields
+    drawable.text((label_x, y5), "Shred on:", fill=0, font=font_bold)
+    drawable.text(
+        (label_x + value_offset, y5),
+        printable_data.shred_timestamp,
+        fill=0,
+        font=font_regular,
+    )
+
+    drawable.text((label_x, y6), "Duration:", fill=0, font=font_bold)
+    drawable.text(
+        (label_x + value_offset, y6),
+        printable_data.shred_duration,
+        fill=0,
+        font=font_regular,
+    )
+
+    # Capacity at the bottom
+    drawable.text(
+        (x_capacity, y_capacity),
+        printable_data.capacity,
+        fill=0,
+        font=font_bold_bigger,
+    )
 
-def draw_outline(drawable, margin, width, output_width, output_height):
-    #upper 
-    drawable.line([(margin,margin), (output_width -margin ,margin)], fill=None, width=width, joint=None)
-    #left
-    drawable.line([(margin,margin), (margin ,output_height-margin)], fill=None, width=width, joint=None)
-    #right
-    drawable.line([(output_width-margin,margin), (output_width-margin ,output_height-margin)], fill=None, width=width, joint=None)
-    #lower
-    drawable.line([(margin,output_height - margin), (output_width-margin,output_height -margin)], fill=None, width=width, joint=None)
 
 def draw_qr_code(image, data):
+    """
+    Draws a QR code on the provided image at a specific location.
+
+    Parameters:
+        image (Image.Image): The target image.
+        data (str): The data to encode in the QR code.
+    """
+    # Generate the QR code
     qr_img = qrcode.make(data)
-    qr_img.thumbnail((291, 291), Image.Resampling.LANCZOS)
-    image.paste(qr_img, (7, 7))
+    qr_img = qr_img.convert("1")  # Ensure QR code is in binary (black/white)
+
+    # Remove white border
+    bbox = qr_img.getbbox()  # Get the bounding box of the non-white area
+    qr_img = qr_img.crop(bbox)
+
+    # Resize to desired size
+    qr_img = qr_img.resize((QR_CODE_SIZE, QR_CODE_SIZE), Image.Resampling.LANCZOS)
+
+    # Paste the QR code onto the image
+    region = (5, 5, 5 + QR_CODE_SIZE, 5 + QR_CODE_SIZE)
+    image.paste(qr_img, box=region)
+
+
+def draw_outline(drawable, margin, width, output_width, output_height):
+    """
+    Draws a rectangular outline on the drawable canvas.
+
+    Parameters:
+        drawable (ImageDraw.Draw): The drawable canvas.
+        margin (int): The margin from the edges of the image.
+        width (int): The width of the outline.
+        output_width (int): The total width of the image.
+        output_height (int): The total height of the image.
+    """
+    # Define the four corners of the rectangle, adjusting for line width
+    top_left = (margin, margin)
+    top_right = (output_width - margin - width, margin)
+    bottom_left = (margin, output_height - margin - width)
+    bottom_right = (output_width - margin - width, output_height - margin - width)
+
+    # Draw the outline lines with adjusted coordinates
+    lines = [
+        (top_left, top_right),  # Top edge
+        (top_left, bottom_left),  # Left edge
+        (top_right, bottom_right),  # Right edge
+        (bottom_left, bottom_right),  # Bottom edge
+    ]
+
+    for line in lines:
+        drawable.line(line, fill=0, width=width)
 
 
 def generate_image(drive, rehdd_info, output_file):
-    output_width = 696 #in px set by used paper
-    output_height = 300 #in px 
-    text_x_offset= 300 #in px 
-
-    qr_data = DriveDataJson(drive, rehdd_info)
+    """Generates an image containing drive data and a QR code."""
     try:
-        json_qr_daten = json.dumps(dataclasses.asdict(qr_data))
-    except Exception as ex:
-        print("unable to generate json: " + str(ex))
-        return
 
-    try:
+        drive_json = DriveDataJson(
+            state=drive.drive_state,
+            fam=drive.modelfamily,
+            name=drive.modelname,
+            cap=drive.capacity,
+            sn=drive.serialnumber,
+            poh=drive.power_on_hours,
+            pc=drive.power_cycle,
+            err=drive.smart_error_count,
+            time=int(drive.shred_timestamp),
+            dur=drive.shred_duration,
+        )
+
+        qr_data = json.dumps(dataclasses.asdict(QrDataJson(drive_json, rehdd_info)))
         printable_data = format_to_printable(drive)
-    except Exception as ex:
-        print("unable to format data: " + str(ex))
+    except Exception as e:
+        logging.error(f"Error preparing data: {e}")
         return
 
-    #print(printable_data)
-
-    #create black and white (binary) image with white background 
-    output_image = Image.new('1', (output_width, output_height), "white")
-
-    #create draw pane
+    output_image = Image.new("1", (OUTPUT_WIDTH, OUTPUT_HEIGHT), "white")
     draw = ImageDraw.Draw(output_image)
 
-    draw_outline(draw, 1, 4, output_width, output_height)
-    draw_text(draw, printable_data, text_x_offset)
-    draw_qr_code(output_image, str(json_qr_daten).replace(" ", ""))
+    font_regular = ImageFont.truetype(find_font_path(DEFAULT_FONT_REGULAR), 20)
+    font_bold = ImageFont.truetype(find_font_path(DEFAULT_FONT_BOLD), 20)
+    font_bold_bigger = ImageFont.truetype(find_font_path(DEFAULT_FONT_BOLD), 42)
 
+    draw_outline(draw, 0, 3, OUTPUT_WIDTH + 1, OUTPUT_HEIGHT + 1)
+    draw_text(draw, printable_data, font_regular, font_bold, font_bold_bigger)
+    draw_qr_code(output_image, qr_data)
+
+    try:
         output_image.save(output_file)
+        logging.info(f"Image saved to {output_file}")
+    except Exception as e:
+        logging.error(f"Error saving image: {e}")
 
 
 def main():
-
-    rehdd_info = ReHddInfo("https://git.mosad.xyz/localhorst/reHDD", "bV0.2.2") # read this from rehdd process
+    rehdd_info = ReHddInfo("https://git.mosad.xyz/localhorst/reHDD", "bV0.2.2")
 
     temp_drive = DriveData(
-        drive_index=0,\
-        drive_state="shredded",\
-        modelfamiliy="Toshiba 2.5\\ HDD MK..65GSSX",\
-        modelname="TOSHIBA MK3265GSDX",\
-        capacity=343597383680,\
-        serialnumber="YG6742U56UDRL123",\
-        power_on_hours=7074,\
-        power_cycle=4792,\
-        smart_error_count=1,\
-        shred_timestamp=1647937421,\
-        shred_duration=81718)
+        drive_index=0,
+        drive_state="shredded",
+        modelfamily='Toshiba 2.5" HDD MK..65GSSX',
+        modelname="TOSHIBA MK3265GSDX",
+        capacity=343597383000,
+        serialnumber="YG6742U56UDRL123456789ABCDEFGJKL",
+        power_on_hours=7074,
+        power_cycle=4792,
+        smart_error_count=1,
+        shred_timestamp=datetime.datetime.now(datetime.timezone.utc).timestamp(),
+        shred_duration=81718,
+    )
 
     generate_image(temp_drive, rehdd_info, "output.png")
 

reHDDPrinter.py

@@ -3,68 +3,215 @@
 
 """ Author:                     Hendrik Schutter, localhorst@mosad.xyz
     Date of creation:           2022/11/23
-    Date of last modification:  2022/11/23
+    Date of last modification:  2025/06/15
 """
 
-import sysv_ipc 
-import pycstruct
+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
 
-str_buffer_size = 64        #keep this synchronous to reHDD
-msg_queue_key = 0x1B11193C0 #keep this synchronous to reHDD
+# 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"
 
-def get_struct_format():
-    #keep this synchronous to struct in reHDD
-    driveData = pycstruct.StructDef()
-    driveData.add('utf-8', 'driveIndex', length=str_buffer_size)
-    driveData.add('utf-8', 'driveHours', length=str_buffer_size)
-    driveData.add('utf-8', 'driveCycles', length=str_buffer_size)
-    driveData.add('utf-8', 'driveErrors', length=str_buffer_size)
-    driveData.add('utf-8', 'driveShredTimestamp', length=str_buffer_size)
-    driveData.add('utf-8', 'driveShredDuration', length=str_buffer_size)
-    driveData.add('utf-8', 'driveCapacity', length=str_buffer_size)
-    driveData.add('utf-8', 'driveState', length=str_buffer_size)
-    driveData.add('utf-8', 'driveModelFamiliy', length=str_buffer_size)
-    driveData.add('utf-8', 'driveModelName', length=str_buffer_size)
-    driveData.add('utf-8', 'driveSerialnumber', length=str_buffer_size)
-    driveData.add('utf-8', 'driveReHddVersion', length=str_buffer_size)
-    return driveData
+terminate = False
 
-def main():
-    try:
-        mq = sysv_ipc.MessageQueue(msg_queue_key, sysv_ipc.IPC_CREAT)
 
-        while True:
-            message, mtype = mq.receive()
-            driveData = get_struct_format().deserialize(message)
+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),
+    ]
 
-            rehdd_info = layouter.ReHddInfo("https://git.mosad.xyz/localhorst/reHDD", driveData['driveReHddVersion'])
+
+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(driveData['driveIndex']),\
-            drive_state=str(driveData['driveState']),\
-            modelfamiliy=str(driveData['driveModelFamiliy']),\
-            modelname=str(driveData['driveModelName']),\
-            capacity=int(driveData['driveCapacity']),\
-            serialnumber=str(driveData['driveSerialnumber']),\
-            power_on_hours=int(driveData['driveHours']),\
-            power_cycle=int(driveData['driveCycles']),\
-            smart_error_count=int(driveData['driveErrors']),\
-            shred_timestamp=int(driveData['driveShredTimestamp']),\
-            shred_duration=int(driveData['driveShredDuration']))
+        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"]),
+    )
 
-            layouter.generate_image(drive, rehdd_info, file_name)
+    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"),
+                }
+                time.sleep(3) 
+
+            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")
-            create_label(qlr, file_name, '62')
-            with open("/dev/usb/lp0", 'wb') as file:
+                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)
-    except sysv_ipc.ExistentialError:
-        print("ERROR: message queue creation failed")
+            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
+    while True:
+        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}")
+            time.sleep(30)
+
 
 if __name__ == "__main__":
     main()