127 lines
4.2 KiB
Python
127 lines
4.2 KiB
Python
import io
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import logging
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from math import inf
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from brother_ql import BrotherQLRaster, create_label
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from brother_ql.backends import guess_backend, backend_factory
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from brother_ql.conversion import convert
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from pysnmp.entity.engine import SnmpEngine
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from pysnmp.hlapi import getCmd, CommunityData, UdpTransportTarget, ContextData
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from pysnmp.smi.rfc1902 import ObjectType, ObjectIdentity
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from labeler.domain.objects import MediaDefinition, Dimension, Image
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from labeler.infra.e550w_printer.media_definitions import (
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media_width,
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tape_color,
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text_color,
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media_type,
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WIDTH_BYTE,
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COLOR_BYTE,
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TEXT_COLOR_BYTE,
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TYPE_BYTE,
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)
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from labeler.interfaces import Printer
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from PIL import Image as PILImage
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PRINTABLE_WIDTH = {
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6: Dimension.from_points(64, 360),
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9: Dimension.from_points(100, 360),
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12: Dimension.from_points(140, 360),
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18: Dimension.from_points(224, 360),
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24: Dimension.from_points(256, 360),
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}
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class E550W(Printer):
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def __init__(self, ip_address: str):
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self.ip_address = ip_address
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self.snmp_port = 161
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def get_installed_media(self) -> MediaDefinition:
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return self.__get_printer_status()
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def print_label(self, label: Image):
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im = PILImage.open(io.BytesIO(label.bytes))
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qlr = BrotherQLRaster("PT-E550W")
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convert(
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qlr,
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[im],
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self.__media_width_to_type(label.height),
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red=False,
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threshold=70,
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cut=True,
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rotate=90,
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compress=True,
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dpi_600=True,
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hq=True,
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)
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try:
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try:
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selected_backend = guess_backend(f"tcp://{self.ip_address}:9100")
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except ValueError:
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logging.error(
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"Couln't guess the backend to use from the printer string descriptor"
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)
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BACKEND_CLASS = backend_factory(selected_backend)["backend_class"]
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be = BACKEND_CLASS(f"tcp://{self.ip_address}:9100")
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be.write(qlr.data)
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be.dispose()
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del be
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except Exception as e:
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logging.exception("Exception happened: %s", e)
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def __media_width_to_type(self, height: int):
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metric_width = Dimension.from_points(height, 360)
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for width, printable_width in PRINTABLE_WIDTH.items():
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if printable_width == metric_width:
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return f"pt5{width}"
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raise ValueError(f"Unsupported media width: {metric_width}")
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def __get_printer_status(self):
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raw_snmp_data = self.__get_snmp_status().asNumbers()
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width = media_width(raw_snmp_data[WIDTH_BYTE])
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media_tape_color = tape_color(raw_snmp_data[COLOR_BYTE])
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media_text_color = text_color(raw_snmp_data[TEXT_COLOR_BYTE])
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tape_type = media_type(raw_snmp_data[TYPE_BYTE])
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return MediaDefinition(
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width=Dimension(mm=width),
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length=Dimension(mm=inf),
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minimal_margin_vertical=(Dimension(mm=width) - PRINTABLE_WIDTH[width]) / 2,
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minimal_margin_horizontal=Dimension(mm=1),
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dpi=360,
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description=f"{tape_type} - {width}mm, {media_text_color} on {media_tape_color} background",
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)
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def __get_snmp_status(self):
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"""
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This oid was found by using wireshark, however it's also documented here:
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https://support.brother.com/g/s/es/dev/en/command/faq/index.html?c=eu_ot&lang=en&navi=offall&comple=on&redirect=on
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just not for the E550W model.
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"""
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oid = "1.3.6.1.4.1.2435.3.3.9.1.6.1.0"
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error_indication, error_status, error_index, var_binds = next(
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getCmd(
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SnmpEngine(),
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CommunityData("public", mpModel=0),
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UdpTransportTarget((self.ip_address, self.snmp_port)),
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ContextData(),
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ObjectType(ObjectIdentity(oid)),
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)
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)
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if error_indication:
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raise Exception(error_indication)
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elif error_status:
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raise Exception(
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"%s at %s"
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% (
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error_status.prettyPrint(),
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error_index and var_binds[int(error_index) - 1][0] or "?",
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)
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)
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else:
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return var_binds[0][1]
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