309 lines
12 KiB
Python
309 lines
12 KiB
Python
"""
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Queue Manager für die Verwaltung von Druckjobs in Warteschlangen.
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Überwacht offline Drucker und aktiviert Jobs automatisch.
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"""
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import threading
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import time
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import logging
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import subprocess
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import os
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import requests
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from datetime import datetime, timedelta
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from typing import List, Dict, Optional, Tuple
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from contextlib import contextmanager
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from models import get_db_session, Job, Printer, User, Notification
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from utils.logging_config import get_logger
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# Logger für Queue-Manager
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queue_logger = get_logger("queue_manager")
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def check_printer_status(ip_address: str, timeout: int = 5) -> Tuple[str, bool]:
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"""
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Vereinfachte Drucker-Status-Prüfung für den Queue Manager.
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Args:
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ip_address: IP-Adresse der Drucker-Steckdose
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timeout: Timeout in Sekunden (Standard: 5)
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Returns:
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Tuple[str, bool]: (Status, Aktiv) - Status ist "online" oder "offline", Aktiv ist True/False
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"""
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if not ip_address or ip_address.strip() == "":
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return "offline", False
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try:
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# Ping-Test um Erreichbarkeit zu prüfen
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if os.name == 'nt': # Windows
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cmd = ['ping', '-n', '1', '-w', str(timeout * 1000), ip_address.strip()]
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else: # Unix/Linux/macOS
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cmd = ['ping', '-c', '1', '-W', str(timeout), ip_address.strip()]
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result = subprocess.run(
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cmd,
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capture_output=True,
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text=True,
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timeout=timeout + 1
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)
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# Wenn Ping erfolgreich ist, als online betrachten
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if result.returncode == 0:
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queue_logger.debug(f"✅ Drucker {ip_address} ist erreichbar (Ping erfolgreich)")
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return "online", True
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else:
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queue_logger.debug(f"❌ Drucker {ip_address} nicht erreichbar (Ping fehlgeschlagen)")
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return "offline", False
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except subprocess.TimeoutExpired:
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queue_logger.warning(f"⏱️ Ping-Timeout für Drucker {ip_address} nach {timeout} Sekunden")
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return "offline", False
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except Exception as e:
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queue_logger.error(f"❌ Fehler beim Status-Check für Drucker {ip_address}: {str(e)}")
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return "offline", False
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class PrinterQueueManager:
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"""
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Verwaltet die Warteschlangen für offline Drucker und überwacht deren Status.
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"""
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def __init__(self):
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self.is_running = False
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self.monitor_thread = None
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self.check_interval = 120 # 2 Minuten zwischen Status-Checks
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self.last_status_cache = {} # Cache für letzten bekannten Status
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self.notification_cooldown = {} # Verhindert Spam-Benachrichtigungen
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def start(self):
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"""Startet den Queue-Manager."""
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if not self.is_running:
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self.is_running = True
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self.monitor_thread = threading.Thread(target=self._monitor_loop, daemon=True)
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self.monitor_thread.start()
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queue_logger.info("✅ Printer Queue Manager erfolgreich gestartet")
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def stop(self):
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"""Stoppt den Queue-Manager."""
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self.is_running = False
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if self.monitor_thread and self.monitor_thread.is_alive():
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self.monitor_thread.join(timeout=5)
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queue_logger.info("❌ Printer Queue Manager gestoppt")
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def _monitor_loop(self):
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"""Hauptschleife für die Überwachung der Drucker."""
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queue_logger.info(f"🔄 Queue-Überwachung gestartet (Intervall: {self.check_interval} Sekunden)")
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while self.is_running:
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try:
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self._check_waiting_jobs()
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time.sleep(self.check_interval)
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except Exception as e:
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queue_logger.error(f"❌ Fehler in Monitor-Schleife: {str(e)}")
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time.sleep(30) # Kürzere Wartezeit bei Fehlern
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def _check_waiting_jobs(self):
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"""Überprüft alle wartenden Jobs und aktiviert sie bei verfügbaren Druckern."""
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db_session = get_db_session()
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try:
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# Alle wartenden Jobs abrufen
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waiting_jobs = db_session.query(Job).filter(
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Job.status == "waiting_for_printer"
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).all()
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if not waiting_jobs:
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return
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queue_logger.info(f"🔍 Überprüfe {len(waiting_jobs)} wartende Jobs...")
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activated_jobs = []
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for job in waiting_jobs:
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# Drucker-Status prüfen
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printer = db_session.query(Printer).get(job.printer_id)
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if not printer:
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continue
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# Status-Check mit Cache-Optimierung
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printer_key = f"printer_{printer.id}"
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current_status = None
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try:
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if printer.plug_ip:
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status, active = check_printer_status(printer.plug_ip, timeout=5)
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current_status = "online" if (status == "online" and active) else "offline"
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else:
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current_status = "offline"
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except Exception as e:
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queue_logger.warning(f"⚠️ Status-Check für Drucker {printer.name} fehlgeschlagen: {str(e)}")
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current_status = "offline"
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# Prüfen, ob Drucker online geworden ist
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last_status = self.last_status_cache.get(printer_key, "offline")
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self.last_status_cache[printer_key] = current_status
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if current_status == "online" and last_status == "offline":
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# Drucker ist online geworden!
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queue_logger.info(f"🟢 Drucker {printer.name} ist ONLINE geworden - aktiviere wartende Jobs")
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# Job aktivieren
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job.status = "scheduled"
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printer.status = "available"
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printer.active = True
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printer.last_checked = datetime.now()
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activated_jobs.append({
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"job": job,
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"printer": printer
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})
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elif current_status == "online":
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# Drucker ist bereits online, Job kann aktiviert werden
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job.status = "scheduled"
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printer.status = "available"
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printer.active = True
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printer.last_checked = datetime.now()
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activated_jobs.append({
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"job": job,
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"printer": printer
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})
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else:
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# Drucker bleibt offline
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printer.status = "offline"
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printer.active = False
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printer.last_checked = datetime.now()
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# Speichere alle Änderungen
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if activated_jobs:
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db_session.commit()
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queue_logger.info(f"✅ {len(activated_jobs)} Jobs erfolgreich aktiviert")
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# Benachrichtigungen versenden
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for item in activated_jobs:
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self._send_job_activation_notification(item["job"], item["printer"])
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else:
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# Auch offline-Status speichern
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db_session.commit()
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except Exception as e:
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db_session.rollback()
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queue_logger.error(f"❌ Fehler beim Überprüfen wartender Jobs: {str(e)}")
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finally:
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db_session.close()
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def _send_job_activation_notification(self, job: Job, printer: Printer):
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"""Sendet eine Benachrichtigung, wenn ein Job aktiviert wird."""
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try:
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# Cooldown prüfen (keine Spam-Benachrichtigungen)
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cooldown_key = f"job_{job.id}_activated"
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now = datetime.now()
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if cooldown_key in self.notification_cooldown:
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last_notification = self.notification_cooldown[cooldown_key]
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if (now - last_notification).total_seconds() < 300: # 5 Minuten Cooldown
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return
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self.notification_cooldown[cooldown_key] = now
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# Benachrichtigung erstellen
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db_session = get_db_session()
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try:
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user = db_session.query(User).get(job.user_id)
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if not user:
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return
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notification = Notification(
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user_id=user.id,
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type="job_activated",
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payload={
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"job_id": job.id,
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"job_name": job.name,
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"printer_id": printer.id,
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"printer_name": printer.name,
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"start_time": job.start_at.isoformat() if job.start_at else None,
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"message": f"🎉 Gute Nachrichten! Drucker '{printer.name}' ist online. Ihr Job '{job.name}' wurde aktiviert und startet bald."
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}
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)
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db_session.add(notification)
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db_session.commit()
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queue_logger.info(f"📧 Benachrichtigung für User {user.name} gesendet: Job {job.name} aktiviert")
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except Exception as e:
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db_session.rollback()
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queue_logger.error(f"❌ Fehler beim Erstellen der Benachrichtigung: {str(e)}")
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finally:
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db_session.close()
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except Exception as e:
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queue_logger.error(f"❌ Fehler beim Senden der Aktivierungs-Benachrichtigung: {str(e)}")
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def get_queue_status(self) -> Dict:
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"""Gibt den aktuellen Status der Warteschlangen zurück."""
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db_session = get_db_session()
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try:
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# Wartende Jobs zählen
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waiting_jobs = db_session.query(Job).filter(
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Job.status == "waiting_for_printer"
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).count()
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# Offline Drucker mit wartenden Jobs
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offline_printers_with_queue = db_session.query(Printer).join(Job).filter(
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Printer.status == "offline",
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Job.status == "waiting_for_printer"
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).distinct().count()
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# Online Drucker
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online_printers = db_session.query(Printer).filter(
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Printer.status == "available"
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).count()
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total_printers = db_session.query(Printer).count()
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return {
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"waiting_jobs": waiting_jobs,
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"offline_printers_with_queue": offline_printers_with_queue,
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"online_printers": online_printers,
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"total_printers": total_printers,
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"queue_manager_running": self.is_running,
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"last_check": datetime.now().isoformat(),
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"check_interval_seconds": self.check_interval
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}
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except Exception as e:
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queue_logger.error(f"❌ Fehler beim Abrufen des Queue-Status: {str(e)}")
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return {
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"error": str(e),
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"queue_manager_running": self.is_running
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}
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finally:
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db_session.close()
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# Globale Instanz des Queue-Managers
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_queue_manager_instance = None
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def get_queue_manager() -> PrinterQueueManager:
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"""Gibt die globale Instanz des Queue-Managers zurück."""
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global _queue_manager_instance
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if _queue_manager_instance is None:
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_queue_manager_instance = PrinterQueueManager()
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return _queue_manager_instance
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def start_queue_manager():
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"""Startet den globalen Queue-Manager."""
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manager = get_queue_manager()
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manager.start()
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return manager
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def stop_queue_manager():
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"""Stoppt den globalen Queue-Manager."""
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global _queue_manager_instance
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if _queue_manager_instance:
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_queue_manager_instance.stop()
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_queue_manager_instance = None |