17 Commits

Author SHA1 Message Date
n07070
1e46de4b3c Update line lenght of docstring 2026-05-22 10:58:41 +02:00
n07070
e9bf334abd Update raspberry pi class to print via the print queue 2026-05-22 10:58:26 +02:00
n07070
1ba3d1bee3 Add docstring & comments, remove dead code 2026-05-22 10:43:38 +02:00
n07070
20f1145b60 Add comments about the code structure 2026-05-22 10:43:09 +02:00
n07070
d2f670bb68 Apply linting 2026-05-21 02:57:27 +02:00
n07070
f52d7493c8 Restructure main class to activate worker and use tasks, print queue,
update Printer
2026-05-21 02:34:12 +02:00
n07070
b48e7072bf Restructure web class to use print queue and tasks 2026-05-21 02:33:51 +02:00
n07070
cbd5d59445 Add worker class 2026-05-21 02:33:40 +02:00
n07070
e7a7c84664 Add printing queue objects 2026-05-21 02:33:25 +02:00
n07070
60f4eff26c Add task objects 2026-05-21 02:33:12 +02:00
n07070
e78f811904 Update numpy 2026-05-20 16:34:57 +02:00
n07070
0f848ba790 Add an alert if the webcam print fails 2026-05-20 16:34:45 +02:00
n07070
24260834ff Update printing routes for the form 2026-05-20 16:34:33 +02:00
n07070
306cab6606 Fix error flashing and transmission 2026-05-20 16:34:01 +02:00
n07070
26c2de12b6 Add new web route, restructure API route 2026-05-20 13:29:23 +02:00
n07070
f2d3d99e8f Add new functions for discovery and parsing of printers, WIP 2026-05-19 10:52:36 +02:00
n07070
f9831f15c7 Add new dependencies for brother ql printers 2026-05-19 10:52:23 +02:00
13 changed files with 959 additions and 274 deletions

View File

@@ -79,6 +79,16 @@ Your contributions are very much welcome ! You can either request an account on
Please also say if you had a printer to test your code, and which printer you've been using.
### Code structure
The app is written about the Flask framework. You can start by looking at the code in the `src/` folder, in the `main.py` file. There, you will see that a few classes are initialized. In general, they are two parts to the program :
The Web pages and the API, which are the user-facing parts. This is with what the users will interact, and define how the program is going to be used. The web pages are renderer from the `include/` folder where Jinj2 templates are defined.
The Worker and Printer Queue are the internal parts. When a new thing needs to be printed, usually sent from the Web or API interfaces, a new Task in the type of the document is created, and added to a print queue. Then, a Worker thread looks up the state of the queue every so often and picks jobs to execute on the printers connected to the system.
The last part of the program is the Raspberry Pi class, that handles to Photomaton mode, which handles button presses, and LED indicator and a flash.
### Linting
If you want to contribute code, please make sure to lint the project before commiting. This helps the code keep a general structure, and avoids some commons erros and mistakes.

178
poetry.lock generated
View File

@@ -75,6 +75,25 @@ files = [
{file = "blinker-1.9.0.tar.gz", hash = "sha256:b4ce2265a7abece45e7cc896e98dbebe6cead56bcf805a3d23136d145f5445bf"},
]
[[package]]
name = "brother-ql-inventree"
version = "1.3"
description = "Python package to talk to Brother QL label printers"
optional = false
python-versions = "*"
groups = ["main"]
files = [
{file = "brother_ql_inventree-1.3-py3-none-any.whl", hash = "sha256:0f7e0d78bae04f44bcfe1010ed0d99f98d5b4db1d6179da242d5bd52bb0c9ea4"},
{file = "brother_ql_inventree-1.3.tar.gz", hash = "sha256:24335ca5f4b3444c692698b599459a7e6c4bd036dd580074c63d39382914fca3"},
]
[package.dependencies]
attrs = "*"
click = "*"
packbits = "*"
pillow = ">=10.0.0"
pyusb = "*"
[[package]]
name = "certifi"
version = "2026.4.22"
@@ -867,84 +886,84 @@ files = [
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name = "numpy"
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version = "2.4.6"
description = "Fundamental package for array computing in Python"
optional = false
python-versions = ">=3.11"
groups = ["main"]
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{file = "numpy-2.4.6.tar.gz", hash = "sha256:f3a3570c4a2a16746ac2c31a7c7c7b0c186b95ce902e33db6f28094ed7387dda"},
]
[[package]]
@@ -974,6 +993,17 @@ files = [
{file = "packaging-26.2.tar.gz", hash = "sha256:ff452ff5a3e828ce110190feff1178bb1f2ea2281fa2075aadb987c2fb221661"},
]
[[package]]
name = "packbits"
version = "0.6"
description = "PackBits encoder/decoder"
optional = false
python-versions = "*"
groups = ["main"]
files = [
{file = "packbits-0.6.tar.gz", hash = "sha256:bc6b370bb34e04ac8cfa835e06c0484380affc6d593adb8009dd6c0f7bfff034"},
]
[[package]]
name = "pep8"
version = "1.7.1"
@@ -1853,4 +1883,4 @@ h11 = ">=0.16.0,<1"
[metadata]
lock-version = "2.1"
python-versions = ">=3.14"
content-hash = "fd3fb42c796aaaee4193f31df09bb4c74277855c489bf34a27c4bc1616851dfb"
content-hash = "18e1a5c8b085aa639b665279856f9e3c51a734a6a8d1d4dd135ca7e4f67e86ae"

View File

@@ -42,6 +42,7 @@ dependencies = [
"python-escpos (>=3.1,<4.0)",
"pep8 (>=1.7.1,<2.0.0)",
"pylint (>=4.0.5,<5.0.0)",
"brother-ql-inventree (>=1.3,<2.0)",
]
[tool.poetry]

View File

@@ -39,11 +39,14 @@ from flask_limiter.util import get_remote_address
from printer import Printer # The wrapper for the printer class
from raspberry import Raspberry # The Raspberry pi control Class
from web import Web # Wrapper for the web routes and API
from print_queue import PrintQueue
from worker import PrintWorker
# Variables
# We create the main Flask object
app = Flask(__name__)
socketio = SocketIO(app)
socketio = SocketIO(app, cors_allowed_origins="*")
# Global variables
ALLOWED_EXTENSIONS = {"png", "jpg", "jpeg", "gif", "webp"}
# Load the configuration file
@@ -82,10 +85,10 @@ except FileExistsError:
app.logger.debug("Directory %s already exists.", UPLOAD_FOLDER)
except PermissionError:
app.logger.error("Permission denied: Unable to create %s", UPLOAD_FOLDER)
exit(77)
sys.exit(77)
# Output the config file
if os.getenv("LIPY_DEBUG") is True:
if os.getenv("FLASK_DEBUG"):
pprint.pprint(configuration_file)
# We define the app module used by Flask
@@ -113,19 +116,22 @@ rpi = Raspberry(
RASPBERRY_PI_CONNECTED = rpi.is_raspberry_pi()
# Queue creation
print_queue = PrintQueue(app)
# Web & API routes
# Web & API management
web = Web(app, print_queue)
web = Web(app, printer)
if __name__ == "__main__":
app.run(debug=True, use_reloader=False, host="0.0.0.0", ssl_context="adhoc")
# Start worker thread
worker = PrintWorker(app, print_queue, printer, socketio)
worker.start()
# The rate limit
limiter = Limiter(
get_remote_address, app=app, default_limits=["1500 per day", "500 per hour"]
)
# General routes
@app.route("/")
@limiter.limit("1/second", override_defaults=False)
def index():
@@ -142,6 +148,83 @@ def webcam():
return render_template("webcam.html")
# Form treatement
@app.route("/web/print/sms", methods=["POST"])
@limiter.limit("6/minute", override_defaults=False)
def web_print_sms():
"""Prints a short message on a printer"""
app.logger.debug("Printing an sms via web method")
try:
txt = request.form["txt"]
except werkzeug.exceptions.BadRequestKeyError as e:
app.logger.error("Whoops, we are missing the txt input field. : %s ", str(e))
flash("Whoops, no forms submitted or missing signature : " + str(e), "error")
return redirect(url_for("index"))
try:
# comment: We try to get a signature
sign = request.form["signature"]
except werkzeug.exceptions.BadRequestKeyError as e:
app.logger.warning(
"No signature found for this print, using default signature : %s ", str(e)
)
sign = configuration_file["defaults"]["signature"]
try:
web.print_sms(txt, sign)
except RuntimeError as e:
app.logger.error("Whoops, we could not print an SMS because : %s ", str(e))
flash("Whoops, we could not print an SMS because :" + str(e), "error")
return redirect(url_for("index"))
# end try
flash("The SMS has been added to the print queue !", "info")
return redirect(url_for("index"))
@app.route("/web/print/img", methods=["POST"])
@limiter.limit("1/second", override_defaults=False)
def web_print_img():
"""Prints an image on a printer"""
app.logger.debug("Printing an image with web method")
try:
# comment: We try to get a signature
sign = request.form["signature"]
except werkzeug.exceptions.BadRequestKeyError as e:
app.logger.warning(
"No signature found for this print, using default signature : %s", str(e)
)
sign = configuration_file["defaults"]["signature"]
# check if the post request has the file part
if "img" not in request.files:
app.logger.error("Whoops, no images submitted : %s ", str(e))
app.logger.error("Error getting the files : %s", str(e))
flash("Whoops, no images submitted : " + str(e), "error")
return redirect(url_for("index"))
file = request.files["img"]
# If the user does not select a file, the browser submits an
# empty file without a filename.
if file.filename == "":
app.logger.error("Submitted file has no filename !")
flash("Submitted file has no filename !", "error")
return redirect(url_for("index"))
try:
app.logger.debug("Sending the image to the printer.")
web.print_image(file, sign)
except RuntimeError as e:
app.logger.error("The image could not be printed because : %s ", str(e))
flash("The image could not be printed because : " + str(e), "error")
return redirect(url_for("index"))
flash("Picture added to the print queue !", "info")
return redirect(url_for("index"))
# API routes
# The api has the following methods
# api/print/{sms,img,letter,qr,barcode}
@@ -163,93 +246,115 @@ def api_index():
@limiter.limit("6/minute", override_defaults=False)
def api_print_sms():
"""Prints a short message on a printer"""
app.logger.debug("Printing an sms")
app.logger.debug("Printing an sms via API")
try:
txt = request.form["txt"]
except werkzeug.exceptions.BadRequestKeyError as e:
app.logger.error("Whoops, we are missing the txt input field. : %s ", str(e))
flash("Whoops, no forms submitted or missing signature : %s", str(e))
return redirect(url_for("index"))
return str(e), 400
try:
# comment: We try to get a signature
sign = request.form["signature"]
except werkzeug.exceptions.BadRequestKeyError as e:
app.logger.warning(
"No signature found for this print, using default signature.", str(e)
"No signature found for this print, using default signature. : %s", str(e)
)
sign = configuration_file["defaults"]["signature"]
web.print_sms(txt, sign)
return redirect(url_for("index"))
try:
# comment: We try to print the SMS
web.print_sms(txt, sign)
except RuntimeError as e:
return str(e), 500
# end try
return "OK", 200
@app.route("/api/print/img", methods=["POST"])
@limiter.limit("6/minute", override_defaults=False)
def api_print_image():
"""Prints an image on a printer"""
app.logger.debug("Printing an image")
app.logger.debug("Printing an image via API")
try:
# comment: We try to get a signature
sign = request.form["signature"]
except werkzeug.exceptions.BadRequestKeyError as e:
app.logger.warning(
"No signature found for this print, using default signature.", str(e)
"No signature found for this print, using default signature. %s", str(e)
)
sign = configuration_file["defaults"]["signature"]
if request.method == "POST":
# check if the post request has the file part
if "img" not in request.files:
app.logger.error("Whoops, no images submitted : %s ", str(e))
app.logger.error("Error getting the files : %s", str(e))
flash("Whoops, no images submitted : %s", str(e))
return redirect(url_for("index"))
# check if the post request has the file part
if "img" not in request.files:
app.logger.error("Whoops, no images submitted.")
return "No image submitted", 400
file = request.files["img"]
# If the user does not select a file, the browser submits an
# empty file without a filename.
if file.filename == "":
app.logger.error("Submitted file has no filename !")
flash("Submitted file has no filename !")
return redirect(url_for("index"))
file = request.files["img"]
# If the user submits an empty file without a filename.
if file.filename == "":
app.logger.error("Submitted file has no filename !")
return "Submitted file has no filename !", 400
try:
app.logger.debug("Sending the image to the printer.")
web.print_image(file, sign)
except Exception as e:
app.logger.error("The image could not be printed because : %s ", str(e))
flash("The image could not be printed because : %s ", str(e))
return redirect(url_for("index"))
try:
app.logger.debug("Sending the image to the printer.")
web.print_image(file, sign)
except RuntimeError as e:
return str(e), 500
else:
app.logger.error("Method not allowed")
flash("Method not allowed")
return redirect(url_for("index"))
flash("Picture printed ! ")
return redirect(url_for("index"))
return "OK", 200
@app.route("/api/camera/picture")
@app.route("/api/camera/picture", methods=["GET"])
def camera_picture():
"""Returns a picture taken by the camera"""
"""Returns a picture taken by the camera on a raspberry pi"""
if RASPBERRY_PI_CONNECTED:
try:
return rpi.camera_picture()
except Exception as e:
except RuntimeError as e:
return jsonify({"message": "Error getting the stream : " + e}), 500
else:
return jsonify({"message": "No camera present"}), 500
@app.route("/api/queue", methods=["GET"])
def api_queue_status():
"""API endpoint for entire queue"""
return jsonify(web.get_queue_state())
@app.route("/api/worker", methods=["GET"])
def api_worker_state():
"""API endpoint to get the worker state"""
return jsonify(worker.current_state())
@app.route("/api/worker/start")
def api_worker_start():
"""
Enable to worker. This starts to process the print queue.
"""
worker.start_worker()
return jsonify(worker.current_state())
@app.route("/api/worker/stop")
def api_worker_stop():
"""
Stops the print queue. This stops the processing of the print queue.
"""
worker.stop_worker()
return jsonify(worker.current_state())
## Authentification
@app.route("/login")
@limiter.limit("1/second", override_defaults=False)
def login_page():
"""Unsued, logins"""
# web.login(username,password)
return redirect(url_for("index"))
return redirect(url_for("index")), 501
@app.route("/logout")
@@ -257,7 +362,7 @@ def login_page():
def logout_page():
"""Unused, logout"""
# web.logout(username, password)
return redirect(url_for("index"))
return redirect(url_for("index")), 501
@app.errorhandler(429)
@@ -295,3 +400,7 @@ def camera_status():
socketio.emit("camera_status", True)
else:
socketio.emit("camera_status", False)
if __name__ == "__main__":
app.run(debug=True, use_reloader=False, host="0.0.0.0", ssl_context="adhoc")

135
src/print_queue.py Normal file
View File

@@ -0,0 +1,135 @@
"""
This class has the method by which we manage the Tasks
It's a printing queue, so we need to add, remove and get information on where
the queue is
"""
from collections import deque
# Because actually printing and adding new print job requests happen at
# diffrent times, the print queue is managed by it's own thread.
import threading
from datetime import datetime
from task import TaskType
class PrintQueue:
"""
A Double-ended Queue to manage the printing Tasks
"""
def __init__(self, app):
self.app = app
self._queue = deque()
self._lock = threading.Lock()
self._completed_tasks = {} # Store completed task info
self._task_counter = 0
self.app.logger.debug("Created a new PrintQueue")
def __len__(self) -> int:
return len(self._queue)
def enqueue(self, task):
"""Add task to right of the queue and return position"""
with self._lock:
try:
self.app.logger.info("Add task %s to queue ", task.task_id)
self._queue.append(task)
position = self._queue.index(task)
# We return the current position of the task if it was added
self.app.logger.debug(
"Added a new task %s to the queue at position %s",
task.task_id,
position,
)
return position
except Exception as e:
self.app.logger.error("Could not add a task to the queue : %s ", e)
raise e
def dequeue(self):
"""Remove and return next task ( from the left of the queue ) (thread-safe)"""
with self._lock:
return self._queue.popleft() if len(self._queue) > 0 else None
def get_position(self, task):
"""Get current position of task in queue (1-indexed)"""
with self._lock:
if task.task_id in self._completed_tasks:
return None # Task already completed
try:
# Try to get the position of a Task
return self._queue.index(task)
except ValueError as e:
raise e
# end try
def is_empty(self):
"""Check if queue is empty"""
with self._lock:
self.app.logger.debug("Checking if queue is empty")
return len(self._queue) == 0
def get_queue_state(self):
"""Return current queue state"""
with self._lock:
self.app.logger.debug("Return current queue state")
return [{"task_id": t.task_id, "status": t.status} for t in self._queue]
def get_status(self, task_id):
"""Get full status info for a task"""
with self._lock:
if task_id in self._completed_tasks:
return self._completed_tasks[task_id]
# Check in queue if it exists
for index, task in enumerate(self._queue):
if task.task_id == task_id:
# Depending on it's type, we return more info
if task.task_type == TaskType.IMAGE:
return {
"task_id": task_id,
"status": task.status,
"type": task.task_type,
"position": index,
"in_queue": True,
"content": task.content,
"signature": task.signature,
}
if task.task_type == TaskType.TEXT:
return {
"task_id": task_id,
"status": task.status,
"type": task.task_type,
"position": index,
"in_queue": True,
"image_path": str(task.image_path),
"signature": task.signature,
"process": str(task.process),
}
if task.task_type == TaskType.CUT:
return {
"task_id": task_id,
"status": task.status,
"type": task.task_type,
"position": index,
"in_queue": True,
}
return None
def mark_completed(self, task_id, task_status):
"""Mark task as completed and remove from queue"""
with self._lock:
self._completed_tasks[task_id] = {
"task_id": task_id,
"status": task_status,
"position": None,
"in_queue": False,
"completed_at": datetime.now().isoformat(),
}

View File

@@ -1,10 +1,14 @@
# Importing the module to manage the connection to the printer.
import escpos.printer as escp
from time import sleep, gmtime, strftime
# import brother_ql
from time import sleep
import os.path
from PIL import Image, ImageEnhance, ImageOps
from PIL import Image, ImageEnhance
import numpy as np
# Importing the module to manage the connection to the printer.
import escpos.printer
class Printer(object):
"""
@@ -38,7 +42,9 @@ class Printer(object):
self.usb_args["idProduct"] = self.vendor_id
def check_paper(self) -> bool:
# Let's check paper status
"""
On printers that support it, we check that the printer has paper
"""
self.app.logger.debug("Checking paper status...")
self.printer.open(self.usb_args)
status = self.printer.paper_status()
@@ -46,7 +52,7 @@ class Printer(object):
case 0:
self.app.logger.error("Printer has no more paper, aborting...")
self.printer.close()
raise Exception("No more paper in the printer")
raise RuntimeError("No more paper in the printer")
case 1:
self.app.logger.warning(
"Printer needs paper to be changed very soon ! "
@@ -57,19 +63,30 @@ class Printer(object):
self.printer.close()
def init_printer(self):
"""
Check if the printer online ? Is the communication with the printer successfull ?
"""
# TODO: This could happen directly when creating a new Printer class
if os.getenv("FLASK_DEBUG"):
waiting_elapsed = 15
else:
waiting_elapsed = 10
# Is the printer online ? Is the communication with the printer successfull ?
waiting_elapsed = 30
self.app.logger.debug("Waiting for printer to get online...")
while not self.ready:
try:
# This also calls open(), which we need to close()
# or else the device will appear as busy.
p = escp.Usb(self.device_id, self.vendor_id, 0, profile="TM-P80")
p = escpos.printer.Usb(
self.device_id, self.vendor_id, 0, profile="TM-P80"
)
except Exception as e:
self.app.logger.error(
"The USB device is not plugged in, trying again : " + str(e)
"The USB device is not plugged in, trying again %s : %s",
waiting_elapsed,
str(e),
)
pass
@@ -78,6 +95,11 @@ class Printer(object):
self.ready = True
self.app.logger.debug("Printer online !")
except Exception as e:
self.app.logger.error(
"Error while getting the printer online %s : %s",
waiting_elapsed,
str(e),
)
pass
sleep(1)
@@ -115,10 +137,19 @@ class Printer(object):
return True
def print_sms(self, msg, signature="", bold=False):
def _print_sms(self, msg, signature="", bold=False):
if not isinstance(msg, str):
self.app.logger.error(
"It is not possible to print a " + str(type(msg)) + ", only strings."
)
raise ValueError
# We make sure that the signature is not something too goofy
clean_msg = str(msg) + "\n"
clean_signature = str(signature)
# Make checks on the size of the message being printed
if len(clean_msg) > 4096:
self.app.logger.warning(
"Could not print message of this length: " + str(len(clean_msg))
@@ -139,6 +170,8 @@ class Printer(object):
+ ", needs to be below 256 caracters long."
)
# Do the actual printing
# We would pop the next element in the queue here, if it's a sms type
try:
self.printer.open(self.usb_args)
self.printer.set(align="center", font="a", bold=bold)
@@ -148,18 +181,21 @@ class Printer(object):
self.printer.close()
except Exception as e:
self.app.logger.error("Unable to print because : " + str(e))
raise RuntimeError(
"Unable to print a SMS, the printer couldn't do it."
) from e
self.app.logger.info("Printed text")
return True
def print_img(self, path, sign="", center=True, process=False):
clean_signature = str(sign)
def _print_img(self, path, signature="", center=True, process=False):
clean_signature = str(signature)
if len(sign) > 256:
if len(signature) > 256:
self.app.logger.warning(
"Could not print signature of this length: " + str(len(clean_signature))
)
raise Exception(
raise ValueError(
"Could not print signature of this length :"
+ str(len(clean_signature))
+ ", needs to be below 256 caracters long."
@@ -167,7 +203,7 @@ class Printer(object):
if not os.path.isfile(str(path)):
self.app.logger.warning("File does not exist : " + str(path))
raise Exception(
raise OSError(
"The file path for this image :"
+ str(path)
+ " wasn't found. Please try again."
@@ -178,29 +214,44 @@ class Printer(object):
if process:
try:
self.app.logger.debug("Proccessing the image")
path = process_image(self, path)
except Exception as e:
self.app.logger.error(str(e))
return False
path = _process_image(self, path)
except RuntimeError as e:
self.app.logger.error(
"Error while processing the image, aborting print : %s", str(e)
)
raise e
else:
self.app.logger.warning("Not proccessing the image")
try:
self.printer.open(self.usb_args)
self.printer.image(path, center=center)
self.printer.textln(signature)
self.printer.close()
self.app.logger.debug("Printed an image : " + str(path))
os.remove(path)
self.app.logger.debug("Removed image : " + str(path))
except Exception as e:
self.printer.close()
self.app.logger.error(str(e))
return False
raise RuntimeError("Could not print the picture") from e
finally:
try:
os.remove(path)
except OSError as e:
raise e
self.app.logger.debug("Removed image : " + str(path))
try:
self.printer.close()
except Exception as e:
self.app.logger.error(
"Could not close the printer connexion %s", str(e)
)
raise RuntimeError("Could not close the printer connexion. ") from e
self.app.logger.info("Printed a picture")
return True
def qr(self, content):
def _qr(self, content):
try:
self.printer.open(self.usb_args)
self.printer.qr(content, center=True)
@@ -213,7 +264,7 @@ class Printer(object):
self.app.logger.info("Printed a QR")
return True
def cut(self):
def _cut(self):
try:
self.printer.open(self.usb_args)
self.printer.cut()
@@ -226,8 +277,22 @@ class Printer(object):
self.app.logger.info("Did a cut")
return True
def print_task(self, task_type, data):
"""Execute actual print based on task type"""
match (task_type.value):
case "text":
self._print_sms(data["txt"], signature=data["sign"])
case "image":
self._print_img(
data["img"], signature=data["sign"], process=data["process"]
)
case "cut":
self._cut()
case _:
raise RuntimeError("This task type is not supported")
def process_image(self, path):
def _process_image(self, path):
brightness_factor = 1.5 # Used only if image is too dark
brightness_threshold = 100 # Brightness threshold (0255)
contrast_factor = 0.6 # Less than 1.0 = lower contrast
@@ -241,7 +306,7 @@ def process_image(self, path):
original_img = original_img.convert("RGB")
# Resize while maintaining aspect ratio
original_img.thumbnail((max_width, max_height), Image.LANCZOS)
original_img.thumbnail((max_width, max_height), Image.Resampling.LANCZOS)
self.app.logger.debug("Resized the image")
# # Convert to grayscale for dithering
@@ -273,16 +338,100 @@ def process_image(self, path):
# contrast_enhancer = ImageEnhance.Contrast(original_img)
# original_img = contrast_enhancer.enhance(contrast_factor)
# Final resize check
if original_img.height > max_height:
raise ValueError("Image is too long, sorry! Keep it below 575×1000 pixels.")
self.app.logger.error(
"Image is too long, sorry! Keep it below 575×1000 pixels."
)
return False
# Convert to JPEG and save
jpeg_path = os.path.splitext(path)[0] + "_processed.jpg"
original_img.save(jpeg_path, format="JPEG", quality=95, optimize=True)
self.app.logger.debug("Processed and saved image.")
return jpeg_path
def discover_printers():
"""
We try to find all the connected printers ( 0 or n ) to this system.
For every type of supported printer, we try to autodiscover them.
http://www.linux-usb.org/usb.ids A list of USB vendor IDs
04b8 Seiko Epson Corp.
04f9 Brother Industries, Ltd
"""
def find_and_parse_borther_ql_printer():
## We might be able to no use this because there is a `discover` command in https://github.com/pklaus/brother_ql#usage
## Code stolen from https://framagit.org/stickoeur/diagnostickoeur/-/blob/no-masters/printit.py?ref_type=heads
"""Find and parse Brother QL printer information."""
model_manager = ModelsManager()
# Debug print to show we're searching
# print("Searching for Brother QL printer...")
for backend_name in ["pyusb", "linux_kernel"]:
try:
# print(f"Trying backend: {backend_name}")
backend = backend_factory(backend_name)
available_devices = backend["list_available_devices"]()
# print(f"Found {len(available_devices)} devices with {backend_name} backend")
for printer in available_devices:
# print(f"Found device: {printer}")
identifier = printer["identifier"]
parts = identifier.split("/")
if len(parts) < 4:
# print(f"Skipping device with invalid identifier format: {identifier}")
continue
protocol = parts[0]
device_info = parts[2]
serial_number = parts[3]
try:
vendor_id, product_id = device_info.split(":")
except ValueError:
# print(f"Invalid device info format: {device_info}")
continue
# Default model
model = "QL-570"
# Try to match product ID to determine actual model
try:
product_id_int = int(product_id, 16)
for m in model_manager.iter_elements():
if m.product_id == product_id_int:
model = m.identifier
break
# print(f"Matched printer model: {model}")
except ValueError:
# print(f"Invalid product ID format: {product_id}")
continue
printer_info = {
"identifier": identifier,
"backend": backend_name,
"model": model,
"protocol": protocol,
"vendor_id": vendor_id,
"product_id": product_id,
"serial_number": serial_number,
}
# print(f"Found printer: {printer_info}")
return printer_info
except Exception as e:
# print(f"Error with backend {backend_name}: {str(e)}")
continue
print("No Brother QL printer found")
return None
def fint_and_parse_epson_printer():
pass

View File

@@ -1,13 +1,21 @@
from flask_socketio import SocketIO
from gpiozero import Button, LED, DigitalOutputDevice
from time import sleep, gmtime, strftime
from PIL import Image
"""
This class executes when we are on a raspberry Pi.
It handles the press of a button via GPIO,
activates a flash and prints out the picture
that was taken via a USB Webcam.
"""
import io # To check if we are on a Raspberry Pi
import subprocess
import os
from time import sleep, gmtime, strftime
from flask_socketio import SocketIO
from gpiozero import Button, LED, DigitalOutputDevice
from PIL import Image
from task import TextTask, ImageTask, CutTask
class Raspberry(object):
class Raspberry():
"""
This class will manage three things :
- Connecting to a USB webcam
@@ -19,7 +27,7 @@ class Raspberry(object):
def __init__(
self,
printer,
print_queue,
app,
socketio,
button_gpio_port_number,
@@ -27,7 +35,7 @@ class Raspberry(object):
flash_gpio_port_number,
is_flash_present,
):
self.printer = printer
self.print_queue = print_queue
self.socketio = socketio
self.app = app
@@ -38,9 +46,13 @@ class Raspberry(object):
self.image_path = self.app.config["UPLOAD_FOLDER"] + "/image.jpg"
def is_raspberry_pi(self, raise_on_errors=False):
"""
Checking if we are on a Raspberry Pi by checking
information on the /proc/cpuinfo file
"""
# Check if we are running on a raspberry pi
try:
with io.open("/proc/cpuinfo", "r") as cpuinfo:
with io.open("/proc/cpuinfo", "r", encoding="utf-8") as cpuinfo:
found = False
for line in cpuinfo:
if line.startswith("Hardware"):
@@ -141,7 +153,7 @@ class Raspberry(object):
f"Unable to take a picture. Error: {e.stderr.decode()}"
)
return False
except Exception as e:
except RuntimeError as e:
# Catch any unexpected errors
self.app.logger.error(f"Unexpected error while taking picture: {str(e)}")
return False
@@ -198,7 +210,7 @@ class Raspberry(object):
output_path = image_path # Overwrite the original image if no output path is given
image.save(output_path)
except Exception as e:
except RuntimeError as e:
self.app.logger.error(f"Error overlaying logo: {e}")
return False
@@ -225,7 +237,7 @@ class Raspberry(object):
image.save(output_path)
except Exception as e:
except RuntimeError as e:
self.app.logger.error(f"Error cropping image to square: {e}")
return False
@@ -242,7 +254,7 @@ class Raspberry(object):
try:
self.flash.on()
self.take_picture()
except Exception as e:
except RuntimeError as e:
self.app.logger.error(
"Could not take a picture after the button press : " + str(e)
)
@@ -251,15 +263,11 @@ class Raspberry(object):
self.app.logger.debug("Printing picture")
self.led.on()
self.crop_to_square(self.image_path)
self.printer.print_img("src/static/images/extase-club.png", process=True)
self.printer.print_img(self.image_path, process=True)
self.printer.print_sms("")
self.printer.print_sms("With Love From Société.Vide", signature="", bold=True)
self.printer.print_sms("Printed by LittlePrynter", signature="")
self.printer.print_sms("n07070.xyz", signature="")
self.printer.print_sms(strftime("%Y-%m-%d %H:%M", gmtime()), signature="")
self.printer.qr("https://n07070.xyz/articles/littleprynter")
self.printer.cut()
self.print_queue.enqueue(ImageTask(self.image_path,signature="",process=True))
self.print_queue.enqueue(TextTask(content="Imprimé par LittlePrynter", signature=""))
time = strftime("%Y-%m-%d %H:%M", gmtime())
self.print_queue.enqueue(TextTask(content=time, signature=""))
self.print_queue.enqueue(CutTask())
self.led.off()
self.app.logger.debug("Done printing picture")
self.app.logger.debug("Added a photomaton picture to the print queue")
return True

View File

@@ -255,7 +255,12 @@ function print_picture(data){
// headers:{
// 'Content-Type': 'multipart/form-data'
// }
}).then(function(response) { console.log('Success:', response); } , true)
}).then(function(response) {
console.log('Reponse:', response);
if(response.status != 200 ){
alert("The picture could not be printed be : " + response.statusText)
}
} , true)
.catch(error => console.error('Error:', error), false);
}

99
src/task.py Normal file
View File

@@ -0,0 +1,99 @@
"""
Here we define the types of tasks
We are using Abstract Base Classes,
like this we can define types of tasks ( text, images, ... )
that all work with the same basic options
The tasks are going to be injected into a Queue.
It's a usefull way of storing information in our
program, while making sure that things are indeed printed.
It's also a way to prevent two concurrent connexions creating
a access conflict on a single printer, like two people wanting
to print at the same time.
We can also delay and store printing tasks until a printer becomes
available if none is online.
"""
from abc import ABC, abstractmethod
## See https://docs.python.org/3/library/abc.html to learn more about this
# from dataclasses import dataclass
from enum import Enum
import uuid
## You can expand this if you want to take other types of tasks into account
class TaskType(Enum):
"""
The different tasks supported by the printers
"""
TEXT = "text"
IMAGE = "image"
CUT = "cut"
class PrintTask(ABC):
"""
A print task holds information about what we are looking to print.
"""
def __init__(self, task_type):
self.task_id = self._generate_id()
self.task_type = task_type
self.status = "pending" # pending, processing, completed, failed
print("Created a new " + str(self.task_type) + " with ID " + self.task_id)
@abstractmethod
def get_print_data(self):
"""Return data formatted for printer"""
def _generate_id(self):
# Generate unique task ID
return str(uuid.uuid4())
class TextTask(PrintTask):
"""
This tasks represents a texte content, and it's signature.
"""
def __init__(self, content, signature):
super().__init__(TaskType.TEXT)
self.content = content
self.signature = signature
def get_print_data(self):
return {"txt": self.content, "sign": self.signature}
class ImageTask(PrintTask):
"""
This tasks represents a image content ( in the form of it's path ), and it's signature.
"""
def __init__(self, image_path, signature, process):
super().__init__(TaskType.IMAGE)
self.image_path = image_path
self.signature = signature
self.process = process
def get_print_data(self):
# Return image data in printer-compatible format
return {"img": self.image_path, "sign": self.signature, "process": self.process}
class CutTask(PrintTask):
"""
This class activates the cutter on the printer if it exists
"""
def __init__(self):
super().__init__(TaskType.CUT)
# There is no print data,
# the task existence in itself is indication of what to do
def get_print_data(self):
return None

View File

@@ -5,7 +5,7 @@
<div class="card">
<h3 class="card-header">Print a short message</h3>
<div class="card-body">
<form class="form-group" action="/api/print/sms" method="post">
<form class="form-group" action="/web/print/sms" method="post">
<input class="form-control" type="text" name="txt" placeholder="200 chars or less " maxlength="200" required><br>
<input class="form-control" type="text" name="signature" placeholder="Signature or pseudo" maxlength="200"><br>
<input class="btn btn-primary float-right" type="submit" value="Imprimer" name="imprimer">
@@ -18,7 +18,7 @@
<div class="card">
<h3 class="card-header">Print an image</h3>
<div class="card-body">
<form enctype="multipart/form-data" class="form-group" action="/api/print/img" method="post">
<form enctype="multipart/form-data" class="form-group" action="/web/print/img" method="post">
<input class="form-control" type="file" name="img" required><br>
<input class="form-control" type="text" name="signature" placeholder="Signature or pseudo" maxlength="200"><br>
<input class="btn btn-primary float-right" type="submit" value="Imprimer" name="imprimer">

View File

@@ -1,41 +1,41 @@
class User(object):
"""docstring for User."""
# class User(object):
# """docstring for User."""
def __init__(self, arg):
super(User, self).__init__()
self.arg = arg
# def __init__(self, arg):
# super(User, self).__init__()
# self.arg = arg
# @app.route('/login', methods=['POST','GET'])
# @limiter.limit("100 per minute", error_message=error_handler_limiter)
def login():
if request.method == "POST":
if not session.get("logged_in"):
if request.form["username"] and request.form["password"]:
# Get the json
with open("users.json") as f:
users_file = json.load(f)
for user in users_file["users"]:
if users_file["users"][user] == request.form["password"]:
session["logged_in"] = True
session["user"] = request.form["username"]
# # @app.route('/login', methods=['POST','GET'])
# # @limiter.limit("100 per minute", error_message=error_handler_limiter)
# def login():
# if request.method == "POST":
# if not session.get("logged_in"):
# if request.form["username"] and request.form["password"]:
# # Get the json
# with open("users.json") as f:
# users_file = json.load(f)
# for user in users_file["users"]:
# if users_file["users"][user] == request.form["password"]:
# session["logged_in"] = True
# session["user"] = request.form["username"]
if not session.get("logged_in"):
flash("Mot de passe ou pseudo invalide.", "danger")
return redirect(url_for("login"))
else:
return redirect(url_for("display_index_page"))
else:
flash("Incorrect logins")
return render_template("password.html")
else:
return render_template("password.html")
else:
return render_template("password.html")
# if not session.get("logged_in"):
# flash("Mot de passe ou pseudo invalide.", "danger")
# return redirect(url_for("login"))
# else:
# return redirect(url_for("display_index_page"))
# else:
# flash("Incorrect logins")
# return render_template("password.html")
# else:
# return render_template("password.html")
# else:
# return render_template("password.html")
@app.route("/logout")
def logout():
session["logged_in"] = False
flash("Tu est déconnecté", "info")
return redirect(url_for("login"))
# @app.route("/logout")
# def logout():
# session["logged_in"] = False
# flash("Tu est déconnecté", "info")
# return redirect(url_for("login"))

View File

@@ -1,56 +1,78 @@
from flask import Flask, request, flash
from flask import flash
from werkzeug.utils import secure_filename
from printer import Printer
import time
import os
from task import TextTask, ImageTask, CutTask
class Web(object):
"""docstring for web."""
"""Web is the class that gets all of the information from web calls
( API and Web page ) and provides checks before sending stuff to printing"""
def __init__(self, app, printer):
def __init__(self, app, print_queue):
super(Web).__init__()
self.printer = printer
self.print_queue = print_queue
self.app = app
def print_sms(self, texte, sign: str):
# TODO: verify the texte before printing it here ?
def print_sms(self, texte, sign: str) -> bool:
"""
Get text and a signature, prints the text and cuts after that.
"""
self.app.logger.debug("Printing : " + str(texte) + " from " + str(sign))
try:
self.printer.print_sms(texte, sign)
self.printer.cut()
# We create two new tasks and add them directly to the queue
# TODO: this might need to be improved because
# !! there is no garantee !! that both the SMS task and the Cut task
# are added back to back, another task could be
# inserted between the two.
sms = self.print_queue.enqueue(TextTask(content=texte, signature=sign))
cut = self.print_queue.enqueue(CutTask())
except Exception as e:
self.app.logger.error(e)
flash("Error while printing the SMS : " + str(e))
raise RuntimeError("Could not add SMS to queue, " + str(e)) from e
self.app.logger.info("Added two new tasks at position %s and %s", sms, cut)
return True
flash("You message " + str(texte) + " has been printed :)")
def print_image(self, image, sign):
self.app.logger.debug("Uploading file")
def print_image(self, image, sign: str) -> bool:
"""
Get an image and a signature, prints the image and cuts after that.
"""
try:
self.app.logger.debug("Uploading file from " + str(sign))
if self.upload_file(image):
self.app.logger.debug("File has been uploaded, printing...")
self.printer.print_img(
os.path.join(
self.app.config["UPLOAD_FOLDER"],
secure_filename(image.filename),
),
sign=sign,
process=True,
file_uploaded = self.upload_file(image)
except Exception as e:
self.app.logger.error(e)
raise RuntimeError("Could not upload file") from e
if file_uploaded:
self.app.logger.debug("File has been uploaded, printing...")
try:
img = self.print_queue.enqueue(
ImageTask(
os.path.join(
self.app.config["UPLOAD_FOLDER"],
secure_filename(image.filename),
),
signature=sign,
process=True,
)
)
self.printer.cut()
except Exception as e:
self.app.logger.error(e)
flash("Could not upload file." + str(e))
flash("Your image has been printed :)")
cut = self.print_queue.enqueue(CutTask())
except Exception as e:
raise RuntimeError("Could not add IMG to queue" + str(e)) from e
def login(username: str, password: str) -> bool:
pass
self.app.logger.info("Added two new tasks at position %s and %s", img, cut)
def logout(username: str, password: str) -> bool:
pass
return True
def login(self, username: str, password: str) -> bool:
"""Not implemented"""
return
def logout(self, username: str, password: str) -> bool:
"""Not implemented"""
return
def allowed_file(self, filename) -> bool:
self.app.logger.debug("Is the filename allowed ?")
@@ -62,22 +84,32 @@ class Web(object):
def upload_file(self, image) -> bool:
self.app.logger.debug("Validating file")
if image and self.allowed_file(image.filename):
filename = secure_filename(image.filename)
self.app.logger.debug("File valid")
try:
image.save(os.path.join(self.app.config["UPLOAD_FOLDER"], filename))
self.app.logger.debug("File saved")
except Exception as e:
self.app.logger.error("Could not save file")
flash(str(e), "error")
return False
if image:
if self.allowed_file(image.filename):
filename = secure_filename(image.filename)
self.app.logger.debug("File valid")
try:
image.save(os.path.join(self.app.config["UPLOAD_FOLDER"], filename))
except OSError as e:
self.app.logger.error("Could not save file %s", e)
return False
self.app.logger.debug(
"File saved to "
+ str(os.path.join(self.app.config["UPLOAD_FOLDER"], filename))
)
return True
self.app.logger.debug(
"File saved to "
+ str(os.path.join(self.app.config["UPLOAD_FOLDER"], filename))
)
return True
else:
self.app.logger.error(
"Could not save file because the filename is forbidden"
)
return False
else:
self.app.logger.error("Could not save file " + str(filename))
self.app.logger.error(
"Could not save file, it seems to be null ? : " + str(filename)
)
return False
def get_queue_state(self):
"""Return current queue state"""
return self.print_queue.get_queue_state()

107
src/worker.py Normal file
View File

@@ -0,0 +1,107 @@
# This is the main printing thread
# As explained in the task file, this is where we command
# printing to happen.
import threading
import time
class PrintWorker(threading.Thread):
def __init__(self, app, print_queue, printer, socketio=None):
super().__init__(daemon=True)
self.app = app
self.print_queue = print_queue
self.printer = printer
self.socketio = socketio # Optional
self.running = True
self.state = "idle" # idle, printing, dead, drinking-a-beer
self.app.logger.debug("Ho great, I'm alive... I'm ready to work another day...")
def run(self):
"""Background thread that processes queue items"""
self.app.logger.info("Worker started working.")
while True:
if not self.running or not self.printer.ready:
time.sleep(0.2)
continue
try:
task = self.print_queue.dequeue()
except Exception as e:
self.app.logger.error("Could not get a new task ! %s ", str(e))
raise RuntimeError(
"We could not get a new task because " + str(e)
) from e
if task:
try:
self.app.logger.info("Got a new task")
self.app.logger.debug("Got task %s", task.task_id)
self.state = "printing"
task.status = "processing"
self._emit_status(task.task_id, "processing")
print_data = task.get_print_data()
try:
self.printer.print_task(task.task_type, print_data)
except RuntimeError as e:
self.app.logger.error("Could not print : %s", str(e))
raise e
task.status = "completed"
self.print_queue.mark_completed(task.task_id, "completed")
self._emit_status(task.task_id, "completed")
except RuntimeError as e:
task.status = "failed"
self.print_queue.mark_completed(task.task_id, "failed")
self._emit_status(task.task_id, "failed", error=str(e))
print(f"Print task {task.task_id} failed: {e}")
else:
# When they are no new tasks to handle, we put the thread to sleep.
self.state = "idle"
time.sleep(0.1)
def _emit_status(self, task_id, status, error=None):
"""Emit status update via Socket.IO if available"""
if not self.socketio:
return
room = f"task_{task_id}"
data = {
"task_id": task_id,
"status": status,
"position": None, # Task no longer in queue
}
if error:
data["error"] = error
self.socketio.emit("task_status", data, room=room)
def stop_worker(self):
"""
Give the worker a break
"""
self.app.logger.debug("Giving the worker a break")
self.state = "drinking-a-beer"
self.running = False
def start_worker(self):
"""
Get the worker back to it
"""
self.app.logger.debug("Time to work !")
self.state = "idle"
self.running = True
def current_state(self):
"""
Return the worker state
"""
return {
"is_running": self.running,
"queue_size": len(self.print_queue),
"state": self.state,
}