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94 lines
2.8 KiB
Python
94 lines
2.8 KiB
Python
from django.contrib.auth.models import User
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from typing import Dict, Deque, Any, Optional
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from collections import deque
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from datetime import datetime, timedelta
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from YtManagerApp.utils.algorithms import bisect_left
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from threading import Lock
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# Clients will request updates at most every few seconds, so a retention period of 60 seconds should be more than
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# enough. I gave it 15 minutes so that if for some reason the connection fails (internet drops) and then comes back a
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# few minutes later, the client will still get the updates
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__RETENTION_PERIOD = 15 * 60
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__NOTIFICATIONS: Deque[Dict] = deque()
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__NEXT_ID = 0
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__LOCK = Lock()
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# Messages enum
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class Messages:
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STATUS_UPDATE = 'st-up'
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STATUS_OPERATION_PROGRESS = 'st-op-prog'
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STATUS_OPERATION_END = 'st-op-end'
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def __add_notification(message, user: User=None, **kwargs):
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global __NEXT_ID
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__LOCK.acquire()
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try:
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# add notification
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notification = {
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'time': datetime.now(),
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'msg': message,
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'id': __NEXT_ID,
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'uid': user and user.id,
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}
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notification.update(kwargs)
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__NOTIFICATIONS.append(notification)
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__NEXT_ID += 1
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# trim old notifications
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oldest = __NOTIFICATIONS[0]
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while len(__NOTIFICATIONS) > 0 and oldest['time'] + timedelta(seconds=__RETENTION_PERIOD) < datetime.now():
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__NOTIFICATIONS.popleft()
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oldest = __NOTIFICATIONS[0]
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finally:
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__LOCK.release()
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def get_notifications(user: User, last_received_id: Optional[int]):
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__LOCK.acquire()
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try:
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first_index = 0
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if last_received_id is not None:
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first_index = bisect_left(__NOTIFICATIONS,
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{'id': last_received_id},
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key=lambda item: item['id'])
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for i in range(first_index, len(__NOTIFICATIONS)):
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item = __NOTIFICATIONS[i]
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if item['uid'] is None or item['uid'] == user.id:
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yield item
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finally:
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__LOCK.release()
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def get_current_notification_id():
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return __NEXT_ID
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def notify_status_update(status_message: str, user: User=None):
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__add_notification(Messages.STATUS_UPDATE,
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user=user,
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status=status_message)
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def notify_status_operation_progress(op_id: Any, status_message: str, progress_percent: float, user: User=None):
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__add_notification(Messages.STATUS_OPERATION_PROGRESS,
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user=user,
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operation=op_id,
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status=status_message,
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progress=progress_percent)
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def notify_status_operation_ended(op_id: Any, status_message: str, user: User=None):
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__add_notification(Messages.STATUS_OPERATION_END,
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user=user,
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operation=op_id,
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status=status_message)
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