Add tape printing blueprint (preview, probe, print, PDF)
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"""
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Tape printing - admin only. Drives the Brother VC-500W over the network.
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Routes (all under /admin/labels/tape):
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/ choose labels, set tape options, see a live preview
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/preview.png rendered preview of one label
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/print send the job to the printer over IPP
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/download.pdf the same labels as a PDF, for when you'd rather not
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/test probe the printer: model, state, accepted formats
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Created by: Jess Rogerson (yelling commands at Claude.AI)
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"""
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import logging
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from flask import (Blueprint, abort, current_app, flash, jsonify, redirect,
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render_template, request, send_file, url_for)
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from flask_login import login_required
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from app import db
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from app.models.part_label import PartCategory, PartLabel
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from app.models.site_setting import SiteSetting
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from app.routes.admin import admin_required
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from app.services import ipp_client, tape_printer
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logger = logging.getLogger(__name__)
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tape_bp = Blueprint('tape', __name__, url_prefix='/admin/labels/tape')
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def printer_config():
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return {
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'host': (SiteSetting.get('tape_printer_host', '') or '').strip(),
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'port': int(SiteSetting.get('tape_printer_port', '631') or 631),
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'path': (SiteSetting.get('tape_printer_path', '/ipp/print')
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or '/ipp/print'),
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'format': (SiteSetting.get('tape_printer_format', '') or '').strip(),
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'tape': SiteSetting.get('tape_default', tape_printer.DEFAULT_TAPE),
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}
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def _selected_labels():
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"""Resolve the selection from ids= or category=, same as sheet printing."""
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ids = request.values.getlist('ids')
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if len(ids) == 1 and ',' in ids[0]:
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ids = ids[0].split(',')
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ids = [int(v) for v in ids if str(v).strip().isdigit()]
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if ids:
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found = {row.id: row for row in
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PartLabel.query.filter(PartLabel.id.in_(ids)).all()}
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return [found[i] for i in ids if i in found]
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category_id = request.values.get('category', type=int)
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if category_id:
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category = PartCategory.query.get_or_404(category_id)
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return (PartLabel.query
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.filter(PartLabel.category_id.in_(category.descendant_ids()))
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.order_by(PartLabel.location, PartLabel.name).all())
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return []
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@tape_bp.route('/', methods=['GET', 'POST'])
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@login_required
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@admin_required
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def index():
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labels = _selected_labels()
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if not labels:
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flash('Select some labels to print first.', 'warning')
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return redirect(url_for('labels.index'))
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source = request.form if request.method == 'POST' else request.args
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options = tape_printer.options_from_form(source)
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if not source.get('tape'):
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options.tape = printer_config()['tape']
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return render_template(
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'admin/labels/tape.html',
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labels=labels,
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ids=','.join(str(l.id) for l in labels),
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options=options,
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tapes=tape_printer.TAPE_PRESETS,
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tape=tape_printer.get_tape(options.tape),
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field_options=[
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('image', 'Part image'), ('name', 'Part name'),
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('dimensions', 'Dimensions'), ('part_number', 'Part number'),
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('alt_numbers', 'Alternate numbers'), ('category', 'Category'),
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('category_code', 'Category code'), ('location', 'Drawer'),
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('colour', 'Colour name'), ('accent', 'Colour stripe'),
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],
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printer=printer_config(),
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)
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@tape_bp.route('/preview.png')
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@login_required
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@admin_required
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def preview():
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label_id = request.args.get('id', type=int)
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if not label_id:
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abort(400, 'preview.png needs an ?id= of a label.')
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label = PartLabel.query.get_or_404(label_id)
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options = tape_printer.options_from_form(request.args)
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buffer = tape_printer.preview_png(
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label, options, current_app.config['UPLOAD_FOLDER'])
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return send_file(buffer, mimetype='image/png')
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@tape_bp.route('/test', methods=['POST'])
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@login_required
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@admin_required
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def test_printer():
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"""Ask the printer what it is. Always answers; never 500s on a timeout."""
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host = (request.form.get('host')
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or printer_config()['host'] or '').strip()
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if not host:
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return jsonify({'ok': False,
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'error': 'No printer address set.'})
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try:
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port = int(request.form.get('port') or printer_config()['port'])
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except ValueError:
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port = 631
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path = request.form.get('path') or printer_config()['path']
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try:
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info = ipp_client.get_printer_attributes(host, port, path)
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except ipp_client.IPPError as exc:
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return jsonify({'ok': False, 'error': str(exc)})
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except Exception as exc:
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logger.exception('Printer probe blew up')
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return jsonify({'ok': False,
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'error': f'{type(exc).__name__}: {exc}'})
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if info.get('usable_format'):
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info['advice'] = (f'Ready. Jobs will be sent as '
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f'{info["usable_format"]}.')
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else:
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info['advice'] = (
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'Reached the printer, but it did not list a format LIM can '
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'produce (JPEG, PNG or PDF). Use Download PDF and print from '
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'the Brother app instead.')
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return jsonify(info)
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@tape_bp.route('/print', methods=['POST'])
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@login_required
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@admin_required
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def print_tape():
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labels = _selected_labels()
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if not labels:
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flash('Nothing selected to print.', 'warning')
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return redirect(url_for('labels.index'))
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options = tape_printer.options_from_form(request.form)
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config = printer_config()
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host = config['host']
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if not host:
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flash('No tape printer address configured. Set it in Label '
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'Settings.', 'warning')
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return redirect(url_for('labels.settings'))
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# Work out what the printer will take. A stored choice wins; otherwise
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# probe, so a firmware change can't silently break printing.
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mime_type = config['format']
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if not mime_type:
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try:
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info = ipp_client.get_printer_attributes(
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host, config['port'], config['path'])
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mime_type = info.get('usable_format')
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except ipp_client.IPPError as exc:
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flash(f'Could not reach the printer: {exc}', 'danger')
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return redirect(url_for('tape.index', ids=','.join(
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str(l.id) for l in labels)))
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if not mime_type:
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flash('The printer did not offer a format LIM can produce. Use '
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'Download PDF instead.', 'warning')
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return redirect(url_for('tape.index',
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ids=','.join(str(l.id) for l in labels)))
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upload_folder = current_app.config['UPLOAD_FOLDER']
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sent = 0
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failures = []
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for label in labels:
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try:
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image = tape_printer.render_label(label, options, upload_folder)
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document = tape_printer.image_to_bytes(image, mime_type)
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# copies is handled by repeating the job rather than the IPP
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# copies attribute: tape printers vary wildly in honouring it.
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for _ in range(options.copies):
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ipp_client.print_job(
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host, document, mime_type,
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job_name=f'LIM: {label.display_title}'[:120],
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port=config['port'], path=config['path'])
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sent += 1
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except ipp_client.IPPError as exc:
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failures.append(f'{label.display_title}: {exc}')
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except Exception as exc:
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logger.exception('Tape print failed for label %s', label.id)
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failures.append(f'{label.display_title}: {exc}')
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if sent:
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flash(f'Sent {sent} label{"" if sent == 1 else "s"} to the printer.',
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'success')
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for problem in failures[:5]:
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flash(problem, 'danger')
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return redirect(url_for('tape.index',
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ids=','.join(str(l.id) for l in labels),
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tape=options.tape))
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@tape_bp.route('/download.pdf', methods=['GET', 'POST'])
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@login_required
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@admin_required
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def download_pdf():
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"""Every selected label as one PDF, one tape label per page."""
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labels = _selected_labels()
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if not labels:
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flash('Nothing selected.', 'warning')
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return redirect(url_for('labels.index'))
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source = request.form if request.method == 'POST' else request.args
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options = tape_printer.options_from_form(source)
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buffer = tape_printer.render_batch_pdf(
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labels, options, current_app.config['UPLOAD_FOLDER'])
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if buffer is None:
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flash('Nothing to render.', 'warning')
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return redirect(url_for('labels.index'))
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return send_file(buffer, mimetype='application/pdf', as_attachment=True,
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download_name='lego-tape-labels.pdf')
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